Smoke test of the GUI, at last on Linux.

Raw import of libui.
Merge 194b9b1193 into 5f5f22c82b
2025-10-31 11:17:01 -07:00 · 2021-12-05 18:26:56 +00:00 · 2021-12-05 18:00:47 +00:00 · 2021-12-05 17:51:27 +00:00 · 2021-12-05 17:46:23 +00:00 · 2021-12-05 17:09:02 +00:00
841 changed files with 148072 additions and 11986 deletions
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,41 +0,0 @@
-version: '{branch}.{build}'
-clone_depth: 1
-skip_tags: true
-
-environment:
-  MSYSTEM: MINGW32
-
-init:
-  - git config --global core.autocrlf input
-
-install:
-  - set PATH=c:\msys64\mingw32\bin;c:\msys64\usr\bin;c:\msys64\bin;%PATH%
-  - echo %PATH%
-  - pacman -S --noconfirm --needed make ninja mingw-w64-i686-libusb mingw-w64-i686-sqlite3 mingw-w64-i686-zlib mingw-w64-i686-gcc zip
-
-build_script:
-  - make
-  - zip -9 fluxengine.zip fluxengine.exe brother120tool.exe FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
-
-artifacts:
-  - path: fluxengine.zip
-    name: fluxengine.zip
-
-deploy:
-  release: FluxEngine Windows client version $(APPVEYOR_BUILD_NUMBER)
-  description: >
-    This is an automatically built version of the FluxEngine Windows client
-    which is generated whenever a significant checkin has happened. It's had
-    no testing whatsoever.
-
-    To use, download it, put it somewhere, and then run it from a cmd window
-    or other command line shell.
-  provider: GitHub
-  auth_token:
-    secure: dfJjj7fWCoDUz+Ni11OcNPB/U3TNJFwNA2AsL++ChFjniUsZLlC6SDWHiL/t4FZo
-  artifact: fluxengine.zip
-  draft: false
-  prerelease: false
-  on:
-    branch: master
-
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -7,28 +7,48 @@ jobs:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
    - name: apt
-      run: sudo apt install libusb-1.0-0-dev libsqlite3-dev ninja-build
+      run: sudo apt update && sudo apt install libusb-1.0-0-dev libsqlite3-dev ninja-build protobuf-compiler
    - name: make
      run: make

  build-macos:
    runs-on: macos-latest
    steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 1
    - name: brew
-      run: brew install sqlite pkg-config libusb ninja
+      run: brew install sqlite pkg-config libusb ninja protobuf truncate
    - name: make
      run: make

-#  build-windows:
-#    runs-on: windows-latest
-#    steps:
-#    - uses: numworks/setup-msys2@v1
-#      with:
-#        msystem: MSYS
-#    - uses: actions/checkout@v1
-#    - name: pacman
-#      run: msys2do pacman -S --noconfirm --needed make ninja mingw-w64-i686-libusb mingw-w64-i686-sqlite3 mingw-w64-i686-zlib mingw-w64-i686-gcc zip
-#    - name: make
-#      run: msys2do make
+  build-windows:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - uses: msys2/setup-msys2@v2
+      with:
+        update: true
+        msystem: MINGW32
+        install: >-
+          make
+          ninja
+          mingw-w64-i686-libusb
+          mingw-w64-i686-sqlite3
+          mingw-w64-i686-zlib
+          mingw-w64-i686-gcc
+          zip
+          mingw-w64-i686-protobuf
+          vim
+    - uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+    - name: build
+      run: |
+        make
+
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -0,0 +1,63 @@
+name: Autorelease
+
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  dev-release:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - uses: msys2/setup-msys2@v2
+      with:
+        update: true
+        msystem: MINGW32
+        install: >-
+          make
+          ninja
+          mingw-w64-i686-libusb
+          mingw-w64-i686-sqlite3
+          mingw-w64-i686-zlib
+          mingw-w64-i686-gcc
+          zip
+          mingw-w64-i686-protobuf
+          vim
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 1
+    - name: build
+      run: |
+        make
+    - name: zip
+      run: |
+        zip -9 fluxengine.zip fluxengine.exe brother120tool.exe brother240tool.exe FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
+    - name: date
+      run: |
+        echo "RELEASE_DATE=$(date --rfc-3339=date)" >> ${GITHUB_ENV}
+    - name: tag
+      uses: EndBug/latest-tag@latest
+      with:
+        tag-name: dev
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: delete-old-assets
+      uses: mknejp/delete-release-assets@v1
+      with:
+        token: ${{ github.token }}
+        tag: dev
+        assets: | 
+          fluxengine.zip
+        fail-if-no-assets: false
+    - name: release
+      uses: softprops/action-gh-release@v1
+      with:
+        name: Development build ${{ env.RELEASE_DATE }}
+        files: |
+          fluxengine.zip
+        tag_name: dev
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
--- a/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
+++ b/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
@@ -1,246 +1,246 @@
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@@ -4615,12 +4615,12 @@
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 :00000001FF
--- a/FluxEngine.cydsn/FIFOout/FIFOout.v
+++ b/FluxEngine.cydsn/FIFOout/FIFOout.v
@@ -20,33 +20,34 @@ module FIFOout (
 wire [7:0] po;
 assign d = po;

-localparam STATE_WAIT = 1'b0;
-localparam STATE_READ = 1'b1;
+localparam STATE_WAITFORREQ = 0;
+localparam STATE_READFROMFIFO = 1;
+localparam STATE_WAITFORNREQ = 2;

-reg state;
-reg oldreq;
+reg [1:0] state;
+wire readfromfifo;

-assign ack = (state != STATE_READ);
+assign ack = (state == STATE_WAITFORNREQ);
+assign readfromfifo = (state == STATE_READFROMFIFO);

 always @(posedge clk)
 begin
    case (state)
-        STATE_WAIT:
+        /* opcode is not valid; req is low; wait for req to go high. */
+        STATE_WAITFORREQ:
        begin
-            if (!empty)
-            begin
-                if (req && !oldreq)
-                begin
-                    state <= STATE_READ;
-                end
-                oldreq <= req;
-            end
+            if (!empty && req)
+                state <= STATE_READFROMFIFO;
        end
        
-        STATE_READ:
-        begin
-            state <= STATE_WAIT;
-        end
+        /* Fetch a single value from the FIFO. */
+        STATE_READFROMFIFO:
+            state <= STATE_WAITFORNREQ;
+            
+        /* opcode is valid; ack is high. Wait for req to go low. */
+        STATE_WAITFORNREQ:
+            if (!req)
+                state <= STATE_WAITFORREQ;
    endcase
 end
            
@@ -55,11 +56,11 @@ cy_psoc3_dp #(.cy_dpconfig(
    `CS_ALU_OP_PASS, `CS_SRCA_A0, `CS_SRCB_D0,
    `CS_SHFT_OP_PASS, `CS_A0_SRC_NONE, `CS_A1_SRC_NONE,
    `CS_FEEDBACK_DSBL, `CS_CI_SEL_CFGA, `CS_SI_SEL_CFGA,
-    `CS_CMP_SEL_CFGA, /*CFGRAM0: STATE_WAITFORREQ*/
+    `CS_CMP_SEL_CFGA, /*CFGRAM0: idle */
    `CS_ALU_OP_PASS, `CS_SRCA_A0, `CS_SRCB_D0,
    `CS_SHFT_OP_PASS, `CS_A0_SRC___F0, `CS_A1_SRC_NONE,
    `CS_FEEDBACK_DSBL, `CS_CI_SEL_CFGA, `CS_SI_SEL_CFGA,
-    `CS_CMP_SEL_CFGA, /*CFGRAM1: STATE_LOAD*/
+    `CS_CMP_SEL_CFGA, /*CFGRAM1: read from fifo */
    `CS_ALU_OP_PASS, `CS_SRCA_A0, `CS_SRCB_D0,
    `CS_SHFT_OP_PASS, `CS_A0_SRC_NONE, `CS_A1_SRC_NONE,
    `CS_FEEDBACK_DSBL, `CS_CI_SEL_CFGA, `CS_SI_SEL_CFGA,
@@ -102,7 +103,7 @@ cy_psoc3_dp #(.cy_dpconfig(
 )) dp(
        /*  input                   */  .reset(1'b0),
        /*  input                   */  .clk(clk),
-        /*  input   [02:00]         */  .cs_addr({2'b0, state}),
+        /*  input   [02:00]         */  .cs_addr({2'b0, readfromfifo}),
        /*  input                   */  .route_si(1'b0),
        /*  input                   */  .route_ci(1'b0),
        /*  input                   */  .f0_load(1'b0),
--- a/FluxEngine.cydsn/FluxEngine.cydwr
+++ b/FluxEngine.cydsn/FluxEngine.cydwr
@@ -814,7 +814,7 @@
  </Group>
  <Group key="Component">
    <Group key="v1">
-      <Data key="cy_boot" value="cy_boot_v5_80" />
+      <Data key="cy_boot" value="cy_boot_v6_10" />
      <Data key="Em_EEPROM_Dynamic" value="Em_EEPROM_Dynamic_v2_20" />
      <Data key="LIN_Dynamic" value="LIN_Dynamic_v5_0" />
    </Group>
@@ -848,15 +848,18 @@
      <Data key="efd5f185-0c32-4824-ba72-3ceb5356f5a7" value="Clock_1" />
    </Group>
    <Group key="Pin">
+      <Data key="3e1862bb-be82-47b0-9549-7ebfe76b6f7b" value="Pin_2" />
      <Data key="4a398466-709f-4228-9500-96178658e13e" value="RDATA" />
      <Data key="5a3407c1-b434-4438-a7b4-b9dfd2280495" value="MOTEA" />
      <Data key="8d318d8b-cf7b-4b6b-b02c-ab1c5c49d0ba" value="SW1" />
+      <Data key="8fc20a4f-e4d1-44b3-a5d4-546e8628d61e" value="LED" />
      <Data key="12e00eac-69b5-4717-85c8-25ef6b224d4c" value="DEBUG_PINS" />
      <Data key="41e2d8ed-5494-4d8c-8ff7-f4f789cece51" value="REDWC" />
      <Data key="264be2d3-9481-494b-8d9c-c1905a45e9cc" value="FDD" />
      <Data key="472f8fdb-f772-44fb-8897-cc690694237b" value="WDATA" />
      <Data key="736cb12b-c863-43d4-a8f0-42f06023f8b5" value="SIDE1" />
      <Data key="4249c923-fcff-453b-8629-bec6fddd00c1" value="STEP" />
+      <Data key="27315b0e-6a8c-4b7f-be77-73ab434fa803" value="Pin_1" />
      <Data key="1425177d-0d0e-4468-8bcc-e638e5509a9b" value="UartRx" />
      <Data key="a5d987c6-e45b-45b9-ad93-656fab06d720" value="TRK00" />
      <Data key="a93ef5b3-00f4-42c0-8fad-0e275a7e2537" value="MOTEB" />
@@ -868,6 +871,7 @@
      <Data key="c5367cde-21d5-4866-9a32-d16abfea0c61" value="WPT" />
      <Data key="d19368c5-6855-41bb-a9ff-808938abef00" value="INDEX" />
      <Data key="e9f14b5a-b2bf-49b8-98f3-d7b5a43ace8d" value="DRVSB" />
+      <Data key="e16b5ef8-00d3-40a4-bc1c-194983c8eb3d" value="LOW_CURRENT" />
      <Data key="e851a3b9-efb8-48be-bbb8-b303b216c393" value="INDEX300" />
      <Data key="e51063a9-4fad-40c7-a06b-7cc4b137dc18" value="DSKCHG" />
      <Data key="ea7ee228-8b3f-426c-8bb8-cd7a81937769" value="DIR" />
@@ -3962,6 +3966,11 @@
    </Group>
  </Group>
  <Group key="Pin2">
+    <Group key="3e1862bb-be82-47b0-9549-7ebfe76b6f7b">
+      <Group key="0">
+        <Data key="Port Format" value="0,6" />
+      </Group>
+    </Group>
    <Group key="4a398466-709f-4228-9500-96178658e13e">
      <Group key="0">
        <Data key="Port Format" value="1,5" />
@@ -3977,6 +3986,11 @@
        <Data key="Port Format" value="2,2" />
      </Group>
    </Group>
+    <Group key="8fc20a4f-e4d1-44b3-a5d4-546e8628d61e">
+      <Group key="0">
+        <Data key="Port Format" value="2,1" />
+      </Group>
+    </Group>
    <Group key="12e00eac-69b5-4717-85c8-25ef6b224d4c">
      <Group key="0">
        <Data key="Port Format" value="2,2" />
@@ -4058,6 +4072,11 @@
        <Data key="Port Format" value="1,0" />
      </Group>
    </Group>
+    <Group key="27315b0e-6a8c-4b7f-be77-73ab434fa803">
+      <Group key="0">
+        <Data key="Port Format" value="0,7" />
+      </Group>
+    </Group>
    <Group key="1425177d-0d0e-4468-8bcc-e638e5509a9b">
      <Group key="0">
        <Data key="Port Format" value="12,6" />
@@ -4143,6 +4162,11 @@
        <Data key="Port Format" value="12,3" />
      </Group>
    </Group>
+    <Group key="e16b5ef8-00d3-40a4-bc1c-194983c8eb3d">
+      <Group key="0">
+        <Data key="Port Format" value="3,2" />
+      </Group>
+    </Group>
    <Group key="e851a3b9-efb8-48be-bbb8-b303b216c393">
      <Group key="0">
        <Data key="Port Format" value="3,0" />
--- a/FluxEngine.cydsn/FluxEngine.cyprj
+++ b/FluxEngine.cydsn/FluxEngine.cyprj
@@ -39,20 +39,6 @@
 <build_action v="HEADER;;;;" />
 <PropertyDeltas />
 </CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
-<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
-<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="crunch.c" persistent="..\lib\common\crunch.c">
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@@ -1533,20 +1519,20 @@
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-<Hidden v="True" />
+<Hidden v="False" />
 </CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
 <CyGuid_0820c2e7-528d-4137-9a08-97257b946089 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemListSerialize" version="2">
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-<Hidden v="True" />
+<Hidden v="False" />
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 <PropertyDeltas />
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-<Hidden v="True" />
+<Hidden v="False" />
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-<Hidden v="True" />
+<Hidden v="False" />
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+<CyGuid_0820c2e7-528d-4137-9a08-97257b946089 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemListSerialize" version="2">
+<dependencies>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43_REG.h" persistent="Generated_Source\PSoC5\TK43_REG.h">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="HEADER;;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43_REG.c" persistent="Generated_Source\PSoC5\TK43_REG.c">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="SOURCE_C;CortexM3;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43_REG_PM.c" persistent="Generated_Source\PSoC5\TK43_REG_PM.c">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="SOURCE_C;CortexM3;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+</dependencies>
+</CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
+</CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
+<filters />
+</CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0>
+<CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFolderSerialize" version="3">
+<CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtBaseContainerSerialize" version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43" persistent="">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<CyGuid_0820c2e7-528d-4137-9a08-97257b946089 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemListSerialize" version="2">
+<dependencies>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43_aliases.h" persistent="Generated_Source\PSoC5\TK43_aliases.h">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="HEADER;;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43.c" persistent="Generated_Source\PSoC5\TK43.c">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="SOURCE_C;CortexM3;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="TK43.h" persistent="Generated_Source\PSoC5\TK43.h">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="HEADER;;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+</dependencies>
+</CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
+</CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
+<filters />
+</CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0>
 </dependencies>
 </CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
 </CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
@@ -3329,8 +3480,8 @@
 </platforms>
 <project_current_platform v="c9323d49-d323-40b8-9b59-cc008d68a989" />
 <last_selected_tab v="Cypress" />
-<WriteAppVersionLastSavedWith v="4.2.0.641" />
-<WriteAppMarketingVersionLastSavedWith v=" 4.2" />
+<WriteAppVersionLastSavedWith v="4.4.0.80" />
+<WriteAppMarketingVersionLastSavedWith v=" 4.4" />
 <project_id v="ff3eb327-f593-4eb3-a00f-72497469e963" />
 <GenerateDescriptionFiles v="False" />
 </CyGuid_49cfd574-032a-4a64-b7be-d4eeeaf25e43>
@@ -3342,11 +3493,9 @@
 <library_dep persistent="${CyRoot}\psoc\content\default\CyAnnotationLibrary\CyAnnotationLibrary.cylib\CyAnnotationLibrary.cyprj" />
 </library_deps>
 <CyGuid_b0d670ad-d48f-47cb-9d0b-b1642bab195c type_name="CyDesigner.Common.Base.CyExprTypeMgr" version="1" />
-<ignored_deps>
-<library_dep persistent="C:\Users\dg\Documents\PSoC Creator\4.1\Downloads ( 4.1).cylib\Downloads ( 4.1).cyprj" />
-</ignored_deps>
+<ignored_deps />
 </CyGuid_495451fe-d201-4d01-b22d-5d3f5609ac37>
 <boot_component v="" />
-<current_generation v="114" />
+<current_generation v="150" />
 </CyGuid_fec8f9e8-2365-4bdb-96d3-a4380222e01b>
 </CyXmlSerializer>
--- a/FluxEngine.cydsn/Sampler/Sampler.v
+++ b/FluxEngine.cydsn/Sampler/Sampler.v
@@ -1,7 +1,6 @@

 //`#start header` -- edit after this line, do not edit this line
 `include "cypress.v"
-`include "../SuperCounter/SuperCounter.v"

 //`#end` -- edit above this line, do not edit this line
 // Generated on 12/11/2019 at 21:18
@@ -9,7 +8,7 @@
 module Sampler (
 	output [2:0] debug_state,
 	output reg [7:0] opcode,
-	output  req,
+	output  reg       req,
 	input   clock,
 	input   index,
 	input   rdata,
@@ -19,113 +18,63 @@ module Sampler (

 //`#start body` -- edit after this line, do not edit this line

-localparam STATE_RESET = 0;
-localparam STATE_WAITING = 1;
-localparam STATE_INTERVAL = 2;
-localparam STATE_DISPATCH = 3;
-localparam STATE_OPCODE = 4;
-localparam STATE_COUNTING = 5;
+// NOTE: Reset pulse is used in both clock domains, and must be long enough
+// to be detected in both.

-reg [2:0] state;
-wire [6:0] counter;
+reg [5:0] counter;

-wire countnow;
-assign countnow = (state == STATE_COUNTING);
+reg index_q;
+reg rdata_q;

-wire counterreset;
-assign counterreset = (state == STATE_INTERVAL) || (state == STATE_OPCODE);
+reg index_edge;
+reg rdata_edge;

-SuperCounter #(.Delta(1), .ResetValue(0)) Counter
-(
-    /* input */ .clk(clock),
-    /* input */ .reset(counterreset),
-    /* input */ .count(countnow),
-    /* output */ .d(counter)
-);
+reg req_toggle;

-reg oldsampleclock;
-wire sampleclocked;
-assign sampleclocked = !oldsampleclock && sampleclock;
-
-reg oldindex;
-wire indexed;
-assign indexed = !oldindex && index;
-
-wire rdataed;
-reg oldrdata;
-assign rdataed = !oldrdata && rdata;
-
-assign req = (state == STATE_INTERVAL) || (state == STATE_OPCODE);
-
-always @(posedge clock)
+always @(posedge sampleclock)
 begin
    if (reset)
    begin
-        state <= STATE_RESET;
-        opcode <= 0;
-        oldsampleclock <= 0;
-        oldindex <= 0;
-        oldrdata <= 0;
+        index_edge <= 0;
+        rdata_edge <= 0;
+        index_q <= 0;
+        rdata_q <= 0;
+        counter <= 0;
+        req_toggle <= 0;
    end
    else
-        case (state)
-            STATE_RESET:
-                state <= STATE_WAITING;
-            
-            STATE_WAITING:
-            begin
-                if (rdataed || indexed)
-                begin
-                    opcode <= {0, counter};
-                    state <= STATE_INTERVAL;
-                end
-                else if (sampleclocked)
-                begin
-                    oldsampleclock <= 1;
-                    if (counter == 7'h7f)
-                    begin
-                        opcode <= {0, counter};
-                        state <= STATE_OPCODE;
-                    end
-                    else
-                        state <= STATE_COUNTING;
-                end
-                
-                if (oldrdata && !rdata)
-                    oldrdata <= 0;
-                if (oldindex && !index)
-                    oldindex <= 0;
-                if (oldsampleclock && !sampleclock)
-                    oldsampleclock <= 0;
-            end
-            
-            STATE_INTERVAL: /* interval byte sent here; counter reset */
-                state <= STATE_DISPATCH;
-                
-            STATE_DISPATCH: /* relax after interval byte, dispatch for opcode */
-            begin
-                if (rdataed)
-                begin
-                    oldrdata <= 1;
-                    opcode <= 8'h80;
-                    state <= STATE_OPCODE;
-                end
-                else if (indexed)
-                begin
-                    oldindex <= 1;
-                    opcode <= 8'h81;
-                    state <= STATE_OPCODE;
-                end
-                else
-                    state <= STATE_WAITING;
-            end
-            
-            STATE_OPCODE: /* opcode byte sent here */
-                state <= STATE_WAITING;
-                            
-            STATE_COUNTING: /* counter changes here */
-                state <= STATE_WAITING;
-        endcase
+    begin
+        /* Both index and rdata are active high -- positive-going edges
+         * indicate the start of an index pulse and read pulse, respectively.
+         */
+         
+        index_edge <= index && !index_q;
+        index_q <= index;
+        
+        rdata_edge <= rdata && !rdata_q;
+        rdata_q <= rdata;
+        
+        if (rdata_edge || index_edge || (counter == 6'h3f)) begin
+            opcode <= { rdata_edge, index_edge, counter };
+            req_toggle <= ~req_toggle;
+            counter <= 1;   /* remember to count this tick */
+        end else begin
+            counter <= counter + 1;
+        end
+    end
+end
+
+reg req_toggle_q;
+
+always @(posedge clock)
+begin
+    if (reset) begin
+        req_toggle_q <= 0;
+        req <= 0;
+    end else begin
+        req_toggle_q <= req_toggle;
+        req <= (req_toggle != req_toggle_q);
+    end
 end

 //`#end` -- edit above this line, do not edit this line
--- a/FluxEngine.cydsn/Sequencer/Sequencer.v
+++ b/FluxEngine.cydsn/Sequencer/Sequencer.v
@@ -18,21 +18,16 @@ module Sequencer (

 //`#start body` -- edit after this line, do not edit this line

-localparam STATE_IDLE = 0;
-localparam STATE_LOAD = 1;
-localparam STATE_WAITING = 2;
-localparam STATE_PULSING = 3;
-localparam STATE_INDEXING = 4;
+localparam STATE_LOAD = 0;
+localparam STATE_WRITING = 1;

-localparam OPCODE_PULSE = 8'h80;
-localparam OPCODE_INDEX = 8'h81;
+reg state;
+reg [5:0] countdown;
+reg pulsepending;

-reg [2:0] state;
-reg [6:0] countdown;
-
-assign req = (state == STATE_LOAD);
-assign wdata = (state == STATE_PULSING);
-assign debug_state = state;
+assign req = (!reset && (state == STATE_LOAD));
+assign wdata = (!reset && (state == STATE_WRITING) && (countdown == 0) && pulsepending);
+assign debug_state = 0;

 reg olddataclock;
 wire dataclocked;
@@ -40,9 +35,7 @@ always @(posedge clock) olddataclock <= dataclock;
 assign dataclocked = !olddataclock && dataclock;

 reg oldsampleclock;
-wire sampleclocked;
-always @(posedge clock) oldsampleclock <= sampleclock;
-assign sampleclocked = !oldsampleclock && sampleclock;
+reg sampleclocked;

 reg oldindex;
 wire indexed;
@@ -53,48 +46,47 @@ always @(posedge clock)
 begin
    if (reset)
    begin
-        state <= STATE_IDLE;
+        state <= STATE_LOAD;
        countdown <= 0;
+        pulsepending <= 0;
+        oldsampleclock <= 0;
    end
    else
+    begin
+        if (!oldsampleclock && sampleclock)
+            sampleclocked <= 1;
+        oldsampleclock <= sampleclock;
+            
        case (state)
-            STATE_IDLE:
-                state <= STATE_LOAD;
-            
            STATE_LOAD:
+            begin
+                /* A posedge on dataclocked indicates that another opcode has
+                 * arrived. */
                if (dataclocked)
-                    case (opcode)
-                        OPCODE_PULSE:
-                            state <= STATE_PULSING;
-                        
-                        OPCODE_INDEX:
-                            state <= STATE_INDEXING;
-                        
-                        default:
-                        begin
-                            countdown <= opcode[6:0];
-                            state <= STATE_WAITING;
-                        end
-                    endcase
+                begin
+                    pulsepending <= opcode[7];
+                    if (opcode[5:0] == 0)
+                        countdown <= 0;
+                    else
+                        countdown <= opcode[5:0] - 1; /* compensate for extra tick in state machine */
+                    
+                    state <= STATE_WRITING;
+                end
+            end
            
-            STATE_WAITING:
+            STATE_WRITING:
+            begin
                if (sampleclocked)
                begin
                    if (countdown == 0)
                        state <= STATE_LOAD;
                    else
                        countdown <= countdown - 1;
+                    sampleclocked <= 0;
                end
-            
-            STATE_PULSING:
-                state <= STATE_LOAD;
-            
-            STATE_INDEXING:
-                if (indexed)
-                    state <= STATE_LOAD;
-                else
-                    state <= STATE_INDEXING;
+            end
        endcase
+    end
 end

 //`#end` -- edit above this line, do not edit this line
--- a/FluxEngine.cydsn/TopDesign/TopDesign.cysch
+++ b/FluxEngine.cydsn/TopDesign/TopDesign.cysch
--- a/FluxEngine.cydsn/main.c
+++ b/FluxEngine.cydsn/main.c
@@ -5,7 +5,6 @@
 #include <setjmp.h>
 #include "project.h"
 #include "../protocol.h"
-#include "../lib/common/crunch.h"

 #define MOTOR_ON_TIME 5000 /* milliseconds */
 #define STEP_INTERVAL_TIME 6 /* ms */
@@ -14,11 +13,18 @@
 #define DISKSTATUS_WPT    1
 #define DISKSTATUS_DSKCHG 2

-#define STEP_TOWARDS0 1
-#define STEP_AWAYFROM0 0
+#define STEP_TOWARDS0 0
+#define STEP_AWAYFROM0 1
+
+static bool drive0_present;
+static bool drive1_present;

 static volatile uint32_t clock = 0; /* ms */
 static volatile bool index_irq = false;
+/* Duration in ms. 0 causes every pulse to be an index pulse. Durations since
+ * last pulse greater than this value imply sector pulse. Otherwise is an index
+ * pulse. */
+static volatile uint32_t hardsec_index_threshold = 0;

 static bool motor_on = false;
 static uint32_t motor_on_time = 0;
@@ -26,7 +32,7 @@ static bool homed = false;
 static int current_track = 0;
 static struct set_drive_frame current_drive_flags;

-#define BUFFER_COUNT 16
+#define BUFFER_COUNT 64 /* the maximum */
 #define BUFFER_SIZE 64
 static uint8_t td[BUFFER_COUNT];
 static uint8_t dma_buffer[BUFFER_COUNT][BUFFER_SIZE] __attribute__((aligned()));
@@ -41,6 +47,8 @@ static volatile bool dma_underrun = false;
 #define DECLARE_REPLY_FRAME(STRUCT, TYPE) \
    STRUCT r = {.f = { .type = TYPE, .size = sizeof(STRUCT) }}

+static void stop_motor(void);
+
 static void system_timer_cb(void)
 {
    CyGlobalIntDisable;
@@ -65,12 +73,41 @@ static void system_timer_cb(void)

 CY_ISR(index_irq_cb)
 {
-    index_irq = true;
+    /* Hard sectored media has sector pulses at the beginning of every sector
+     * and the index pulse is an extra pulse in the middle of the last sector.
+     * When the extra pulse is seen, the next sector pulse is also the start of
+     * the track. */
+    static bool hardsec_index_irq_primed = false;
+    static uint32_t hardsec_last_pulse_time = 0;
+    uint32_t index_pulse_duration = clock - hardsec_last_pulse_time;
+
+    if (!hardsec_index_threshold)
+    {
+        index_irq = true;
+        hardsec_index_irq_primed = false;
+    }
+    else
+    {
+        /* It's only an index pulse if the previous pulse is less than
+         * the threshold.
+         */
+        index_irq = (index_pulse_duration <= hardsec_index_threshold) ?
+            hardsec_index_irq_primed : false;
+
+        if (index_irq)
+            hardsec_index_irq_primed = false;
+        else
+            hardsec_index_irq_primed =
+                index_pulse_duration <= hardsec_index_threshold;
+
+        hardsec_last_pulse_time = clock;
+    }
    
    /* Stop writing the instant the index pulse comes along; it may take a few
     * moments for the main code to notice the pulse, and we don't want to overwrite
     * the beginning of the track. */
-    ERASE_REG_Write(0);
+    if (index_irq)
+        ERASE_REG_Write(0);
 }

 CY_ISR(capture_dma_finished_irq_cb)
@@ -103,7 +140,10 @@ static void print(const char* msg, ...)
 static void set_drive_flags(struct set_drive_frame* flags)
 {
    if (current_drive_flags.drive != flags->drive)
+    {
+        stop_motor();
        homed = false;
+    }
    
    current_drive_flags = *flags;
    DRIVESELECT_REG_Write(flags->drive ? 2 : 1); /* select drive 1 or 0 */
@@ -142,6 +182,12 @@ static void wait_until_writeable(int ep)
        ;
 }

+static void wait_until_readable(int ep)
+{
+    while (USBFS_GetEPState(ep) != USBFS_OUT_BUFFER_FULL)
+        ;
+}
+
 static void send_reply(struct any_frame* f)
 {
    print("reply 0x%02x", f->f.type);
@@ -159,9 +205,15 @@ static void send_error(int code)
 /* buffer must be big enough for a frame */
 static int usb_read(int ep, uint8_t buffer[FRAME_SIZE])
 {
+    if (USBFS_GetEPState(ep) != USBFS_OUT_BUFFER_FULL)
+    {
+        USBFS_EnableOutEP(ep);
+        wait_until_readable(ep);
+    }
+
    int length = USBFS_GetEPCount(ep);
    USBFS_ReadOutEP(ep, buffer, length);
-    while (USBFS_GetEPState(ep) == USBFS_OUT_BUFFER_FULL)
+    while (USBFS_GetEPState(ep) != USBFS_OUT_BUFFER_EMPTY)
        ;
    return length;
 }
@@ -183,19 +235,19 @@ static void step(int dir)
    CyDelay(STEP_INTERVAL_TIME);
 }

-static void home(void)
+/* returns true if it looks like a drive is attached */
+static bool home(void)
 {
    for (int i=0; i<100; i++)
    {
        /* Don't keep stepping forever, because if a drive's
         * not connected bad things happen. */
        if (TRACK0_REG_Read())
-            break;
+            return true;
        step(STEP_TOWARDS0);
    }
    
-    /* Step to -1, which should be a nop, to reset the disk on disk change. */
-    step(STEP_TOWARDS0);
+    return false;
 }

 static void seek_to(int track)
@@ -230,6 +282,7 @@ static void seek_to(int track)
        CyWdtClear();
    }
    CyDelay(STEP_SETTLING_TIME);
+    TK43_REG_Write(track < 43); /* high if 0..42, low if 43 or up */
    print("finished seek");
 }

@@ -248,7 +301,7 @@ static void cmd_recalibrate(void)
    send_reply(&r);    
 }
    
-static void cmd_measure_speed(struct any_frame* f)
+static void cmd_measure_speed(struct measurespeed_frame* f)
 {
    start_motor();
    
@@ -258,7 +311,7 @@ static void cmd_measure_speed(struct any_frame* f)
    while (!index_irq)
    {
        elapsed = clock - start_clock;
-        if (elapsed > 1000)
+        if (elapsed > 1500)
        {
            elapsed = 0;
            break;
@@ -267,10 +320,14 @@ static void cmd_measure_speed(struct any_frame* f)

    if (elapsed != 0)
    {
-        index_irq = false;
+        int target_pulse_count = f->hard_sector_count + 1;
        start_clock = clock;
-        while (!index_irq)
-            elapsed = clock - start_clock;
+        for (int x=0; x<target_pulse_count; x++)
+        {
+            index_irq = false;
+            while (!index_irq)
+                elapsed = clock - start_clock;
+        }
    }
    
    DECLARE_REPLY_FRAME(struct speed_frame, F_FRAME_MEASURE_SPEED_REPLY);
@@ -278,12 +335,14 @@ static void cmd_measure_speed(struct any_frame* f)
    send_reply((struct any_frame*) &r);    
 }

-static void cmd_bulk_test(struct any_frame* f)
+static void cmd_bulk_write_test(struct any_frame* f)
 {
    uint8_t buffer[64];
    
    wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
    for (int x=0; x<64; x++)
+    {
+        CyWdtClear();
        for (int y=0; y<256; y++)
        {
            for (unsigned z=0; z<sizeof(buffer); z++)
@@ -292,11 +351,44 @@ static void cmd_bulk_test(struct any_frame* f)
            wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
            USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, buffer, sizeof(buffer));
        }
+    }
    
-    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_BULK_TEST_REPLY);
+    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_BULK_WRITE_TEST_REPLY);
    send_reply(&r);
 }

+static void cmd_bulk_read_test(struct any_frame* f)
+{
+    uint8_t buffer[64];
+    
+    bool passed = true;
+    for (int x=0; x<64; x++)
+    {
+        CyWdtClear();
+        for (int y=0; y<256; y++)
+        {
+            usb_read(FLUXENGINE_DATA_OUT_EP_NUM, buffer);
+            for (unsigned z=0; z<sizeof(buffer); z++)
+            {
+                if (buffer[z] != (uint8)(x+y+z))
+                {
+                    print("fail %d+%d+%d == %d, not %d", x, y, z, buffer[z], (uint8)(x+y+z));
+                    passed = false;
+                }
+            }
+        }
+    }
+
+    print("passed=%d", passed);
+    if (passed)
+    {
+        DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_BULK_READ_TEST_REPLY);
+        send_reply(&r);
+    }
+    else
+        send_error(F_ERROR_INVALID_VALUE);
+}
+
 static void deinit_dma(void)
 {
    for (int i=0; i<BUFFER_COUNT; i++)
@@ -306,7 +398,7 @@ static void deinit_dma(void)
 static void init_capture_dma(void)
 {
    dma_channel = SAMPLER_DMA_DmaInitialize(
-        2 /* bytes */,
+        1 /* bytes */,
        true /* request per burst */, 
        HI16(CYDEV_PERIPH_BASE),
        HI16(CYDEV_SRAM_BASE));
@@ -327,14 +419,14 @@ static void init_capture_dma(void)

 static void cmd_read(struct read_frame* f)
 {
-    SIDE_REG_Write(f->side);
    seek_to(current_track);
-    
+    SIDE_REG_Write(f->side);
+    STEP_REG_Write(f->side); /* for drives which multiplex SIDE and DIR */
    /* Do slow setup *before* we go into the real-time bit. */
    
    {
        uint8_t i = CyEnterCriticalSection();
-        SAMPLER_FIFO_SET_LEVEL_MID;
+        SAMPLER_FIFO_SET_LEVEL_NORMAL;
        SAMPLER_FIFO_CLEAR;
        SAMPLER_FIFO_SINGLE_BUFFER_UNSET;
        CyExitCriticalSection(i);
@@ -347,16 +439,14 @@ static void cmd_read(struct read_frame* f)
        
    if (f->synced)
    {
+        hardsec_index_threshold = f->hardsec_threshold_ms;
        index_irq = false;
        while (!index_irq)
            ;
        index_irq = false;
+        hardsec_index_threshold = 0;
    }
    
-    crunch_state_t cs = {};
-    cs.outputptr = usb_buffer;
-    cs.outputlen = BUFFER_SIZE;
-    
    dma_writing_to_td = 0;
    dma_reading_from_td = -1;
    dma_underrun = false;
@@ -371,75 +461,64 @@ static void cmd_read(struct read_frame* f)
    while (dma_writing_to_td == 0)
        ;
    dma_reading_from_td = 0;
+    bool dma_running = true;
    
    /* Start transferring. */

    uint32_t start_time = clock;
-    while (!dma_underrun)
+    for (;;)
    {
        CyWdtClear();

-        /* Wait for the next block to be read. */
-        while (dma_reading_from_td == dma_writing_to_td)
+        /* If the sample session is over, stop reading but continue processing until
+         * the DMA chain is empty. */
+        
+        if ((clock - start_time) >= f->milliseconds)
        {
-            /* On an underrun, give up immediately. */
-            if (dma_underrun)
-                goto abort;
-            
-            /* Also finish if the sample session is over. */
-            if ((clock - start_time) >= f->milliseconds)
-                goto abort;
-        }
-
-        uint8_t dma_buffer_usage = 0;
-        while (dma_buffer_usage < BUFFER_SIZE)
-        {
-            cs.inputptr = dma_buffer[dma_reading_from_td] + dma_buffer_usage;
-            cs.inputlen = BUFFER_SIZE - dma_buffer_usage;
-            crunch(&cs);
-            dma_buffer_usage += BUFFER_SIZE - cs.inputlen;
-            count++;
-            
-            /* If there is no available space in the output buffer, flush the buffer via
-             * USB and go again. */
-            if (cs.outputlen == 0)
+            if (dma_running)
            {
-                wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
-                USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, usb_buffer, BUFFER_SIZE);
-                
-                cs.outputptr = usb_buffer;
-                cs.outputlen = BUFFER_SIZE;
+                CyDmaChSetRequest(dma_channel, CY_DMA_CPU_TERM_CHAIN);
+                while (CyDmaChGetRequest(dma_channel))
+                    ;
+                dma_running = false;
+                dma_underrun = false;
            }
        }
-        dma_reading_from_td = NEXT_BUFFER(dma_reading_from_td);
+        
+        /* If there's an underrun event, stop immediately. */
+        
+        if (dma_underrun)
+            goto abort;
+        
+        /* If there are no more blocks to be read, check to see if we've finished. */
+        
+        if (dma_reading_from_td == dma_writing_to_td)
+        {
+            /* Also if we've run out of blocks to send. */
+            
+            if (!dma_running)
+                goto abort;
+        }
+        else
+        {
+            /* Otherwise, there's a block waiting, so attempt to send it. */
+            
+            wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
+            USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, dma_buffer[dma_reading_from_td], BUFFER_SIZE);
+            count++;
+            dma_reading_from_td = NEXT_BUFFER(dma_reading_from_td);
+        }
    }
 abort:;
    bool saved_dma_underrun = dma_underrun;
-    CyDmaChSetRequest(dma_channel, CY_DMA_CPU_TERM_CHAIN);
-    while (CyDmaChGetRequest(dma_channel))
-        ;

-    donecrunch(&cs);
+    /* Terminate the transfer (all transfers are an exact number of fragments). */
    wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
-    /* If there's a complete packet waiting, send it. */
-    if (cs.outputlen != BUFFER_SIZE)
-    {
-        USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, usb_buffer, BUFFER_SIZE);
-        wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
-    }
-    if ((cs.outputlen != 0) && (cs.outputlen != BUFFER_SIZE))
-    {
-        /* If there's a partial packet waiting, send it; this will also terminate the transfer. */
-        USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, usb_buffer, BUFFER_SIZE-cs.outputlen);
-    }
-    else
-    {
-        /* Otherwise just terminate the transfer. */
-        USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, NULL, 0);
-    }
+    USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, NULL, 0);
    wait_until_writeable(FLUXENGINE_DATA_IN_EP_NUM);
    deinit_dma();

+    STEP_REG_Write(0);
    if (saved_dma_underrun)
    {
        print("underrun after %d packets");
@@ -485,36 +564,32 @@ static void cmd_write(struct write_frame* f)
        return;
    }
    
-    SEQUENCER_CONTROL_Write(1); /* put the sequencer into reset */
-
+    seek_to(current_track);    
    SIDE_REG_Write(f->side);
+    STEP_REG_Write(f->side); /* for drives which multiplex SIDE and DIR */
+    SEQUENCER_CONTROL_Write(1); /* put the sequencer into reset */
    {
        uint8_t i = CyEnterCriticalSection();        
-        REPLAY_FIFO_SET_LEVEL_NORMAL;
+        REPLAY_FIFO_SET_LEVEL_MID;
        REPLAY_FIFO_CLEAR;
        REPLAY_FIFO_SINGLE_BUFFER_UNSET;
        CyExitCriticalSection(i);
    }
-    seek_to(current_track);    

    init_replay_dma();
    bool writing = false; /* to the disk */
-    bool finished = false;
    int packets = f->bytes_to_write / FRAME_SIZE;
+    bool finished = (packets == 0);
    int count_written = 0;
    int count_read = 0;
    dma_writing_to_td = 0;
    dma_reading_from_td = -1;
    dma_underrun = false;
-
-    crunch_state_t cs = {};
-    cs.outputlen = BUFFER_SIZE;
-    USBFS_EnableOutEP(FLUXENGINE_DATA_OUT_EP_NUM);
    
    int old_reading_from_td = -1;
    for (;;)
    {
-        CyWdtClear();
+        //CyWdtClear();

        /* Read data from USB into the buffers. */
        
@@ -523,54 +598,25 @@ static void cmd_write(struct write_frame* f)
            if (writing && (dma_underrun || index_irq))
                goto abort;
            
-            /* Read crunched data, if necessary. */
-            
-            if (cs.inputlen == 0)
+            uint8_t* buffer = dma_buffer[dma_writing_to_td];
+            if (finished)
            {
-                if (finished)
-                {
-                    /* There's no more data to read, so fake some. */
-                    
-                    for (int i=0; i<BUFFER_SIZE; i++)
-                        usb_buffer[i+0] = 0x7f;
-                    cs.inputptr = usb_buffer;
-                    cs.inputlen = BUFFER_SIZE;
-                }
-                else
-                {
-                    while (USBFS_GetEPState(FLUXENGINE_DATA_OUT_EP_NUM) != USBFS_OUT_BUFFER_FULL)
-                    {
-                        if (writing && (dma_underrun || index_irq))
-                            goto abort;
-                    }
-
-                    int length = usb_read(FLUXENGINE_DATA_OUT_EP_NUM, usb_buffer);
-                    cs.inputptr = usb_buffer;
-                    cs.inputlen = length;
-                    USBFS_EnableOutEP(FLUXENGINE_DATA_OUT_EP_NUM);
-
-                    count_read++;
-                    if ((length < FRAME_SIZE) || (count_read == packets))
-                        finished = true;
-                }
+                /* There's no more data to read, so fake some. */
+                
+                memset(buffer, 0x3f, BUFFER_SIZE);
            }
-            
-            /* If there *is* data waiting in the buffer, uncrunch it. */
-            
-            if (cs.inputlen != 0)
+            else
            {
-                cs.outputptr = dma_buffer[dma_writing_to_td] + BUFFER_SIZE - cs.outputlen;
-                uncrunch(&cs);
-                if (cs.outputlen == 0)
-                {
-                    /* Completed a DMA buffer; queue it for writing. */
-                    
-                    dma_writing_to_td = NEXT_BUFFER(dma_writing_to_td);
-                    cs.outputlen = BUFFER_SIZE;
-                }
+                (void) usb_read(FLUXENGINE_DATA_OUT_EP_NUM, buffer);
+                count_read++;
+                
+                if (count_read == packets)
+                    finished = true;
            }
+            dma_writing_to_td = NEXT_BUFFER(dma_writing_to_td);
+            
+            /* Once all the buffers are full, start writing. */
            
-            /* If we have a full buffer, start writing. */
            if ((dma_reading_from_td == -1) && (dma_writing_to_td == BUFFER_COUNT-1))
            {
                dma_reading_from_td = old_reading_from_td = 0;
@@ -585,7 +631,7 @@ static void cmd_write(struct write_frame* f)

                /* Wait for the index marker. While this happens, the DMA engine
                 * will prime the FIFO. */
-                
+                hardsec_index_threshold = f->hardsec_threshold_ms;
                index_irq = false;
                while (!index_irq)
                    ;
@@ -596,7 +642,7 @@ static void cmd_write(struct write_frame* f)
                SEQUENCER_CONTROL_Write(0); /* start writing! */
            }
        }
-        
+
        if (writing && (dma_underrun || index_irq))
            goto abort;

@@ -620,31 +666,29 @@ abort:
    }
    
    print("p=%d cr=%d cw=%d f=%d w=%d index=%d underrun=%d", packets, count_read, count_written, finished, writing, index_irq, dma_underrun);
+    hardsec_index_threshold = 0;
    if (!finished)
    {
-        while (count_read < packets)
+        /* There's still some data to read, so just read and blackhole it ---
+         * easier than trying to terminate the connection. */
+        while (count_read != packets)
        {
-            if (USBFS_GetEPState(FLUXENGINE_DATA_OUT_EP_NUM) == USBFS_OUT_BUFFER_FULL)
-            {
-                int length = usb_read(FLUXENGINE_DATA_OUT_EP_NUM, usb_buffer);
-                if (length < FRAME_SIZE)
-                    break;
-                USBFS_EnableOutEP(FLUXENGINE_DATA_OUT_EP_NUM);
-                count_read++;
-            }
+            (void) usb_read(FLUXENGINE_DATA_OUT_EP_NUM, usb_buffer);
+            count_read++;
        }
-        USBFS_DisableOutEP(FLUXENGINE_DATA_OUT_EP_NUM);
    }
    
    deinit_dma();
-    print("write finished");
    
+    STEP_REG_Write(0);
    if (dma_underrun)
    {
+        print("underrun!");
        send_error(F_ERROR_UNDERRUN);
        return;
    }

+    print("success");
    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_WRITE_REPLY);
    send_reply((struct any_frame*) &r);
 }
@@ -652,10 +696,11 @@ abort:
 static void cmd_erase(struct erase_frame* f)
 {
    SIDE_REG_Write(f->side);
-    seek_to(current_track);    
+    seek_to(current_track);
    /* Disk is now spinning. */
    
    print("start erasing");
+    hardsec_index_threshold = f->hardsec_threshold_ms;
    index_irq = false;
    while (!index_irq)
        ;
@@ -664,6 +709,7 @@ static void cmd_erase(struct erase_frame* f)
    while (!index_irq)
        ;
    ERASE_REG_Write(0);
+    hardsec_index_threshold = 0;
    print("stop erasing");

    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_ERASE_REPLY);
@@ -672,6 +718,10 @@ static void cmd_erase(struct erase_frame* f)

 static void cmd_set_drive(struct set_drive_frame* f)
 {
+    if (drive0_present && !drive1_present)
+        f->drive = 0;
+    if (drive1_present && !drive0_present)
+        f->drive = 1;
    set_drive_flags(f);
    
    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_SET_DRIVE_REPLY);
@@ -785,11 +835,15 @@ static void handle_command(void)
            break;
        
        case F_FRAME_MEASURE_SPEED_CMD:
-            cmd_measure_speed(f);
+            cmd_measure_speed((struct measurespeed_frame*) f);
            break;
            
-        case F_FRAME_BULK_TEST_CMD:
-            cmd_bulk_test(f);
+        case F_FRAME_BULK_WRITE_TEST_CMD:
+            cmd_bulk_write_test(f);
+            break;
+            
+        case F_FRAME_BULK_READ_TEST_CMD:
+            cmd_bulk_read_test(f);
            break;
            
        case F_FRAME_READ_CMD:
@@ -821,6 +875,21 @@ static void handle_command(void)
    }
 }

+static void detect_drives(void)
+{
+    current_drive_flags.drive = 0;
+    start_motor();
+    drive0_present = home();
+    stop_motor();
+    
+    current_drive_flags.drive = 1;
+    start_motor();
+    drive1_present = home();
+    stop_motor();
+    
+    print("drive 0: %s drive 1: %s", drive0_present ? "yes" : "no", drive1_present ? "yes" : "no");
+}
+
 int main(void)
 {
    CyGlobalIntEnable;
@@ -834,11 +903,11 @@ int main(void)
    DRIVESELECT_REG_Write(0);
    UART_Start();
    USBFS_Start(0, USBFS_DWR_VDDD_OPERATION);
+    USBFS_DisableOutEP(FLUXENGINE_DATA_OUT_EP_NUM);
    
+    detect_drives();
    CyWdtStart(CYWDT_1024_TICKS, CYWDT_LPMODE_DISABLED);
    
-    /* UART_PutString("GO\r"); */
-
    for (;;)
    {
        CyWdtClear();
@@ -854,7 +923,7 @@ int main(void)
        {
            print("Waiting for USB...");
            while (!USBFS_GetConfiguration())
-                ;
+                CyWdtClear();
            print("USB ready");
            USBFS_EnableOutEP(FLUXENGINE_CMD_OUT_EP_NUM);
        }
--- a/43
+++ b/43
@@ -1,16 +1,28 @@
-PACKAGES = zlib sqlite3 libusb-1.0
+PACKAGES = zlib sqlite3 libusb-1.0 protobuf gtk+-3.0

-export CFLAGS = -Os -g --std=c++14 \
-	-ffunction-sections -fdata-sections
-export LDFLAGS = -Os
+export CFLAGS = -ffunction-sections -fdata-sections
+export CXXFLAGS = $(CFLAGS) \
+	--std=gnu++2a \
+	-Wno-deprecated-enum-enum-conversion \
+	-Wno-deprecated-enum-float-conversion
+export LDFLAGS = -pthread
+
+export COPTFLAGS = -Os
+export LDOPTFLAGS = -Os -ldl
+
+export CDBGFLAGS = -O0 -g
+export LDDBGFLAGS = -O0 -g -ldl

 ifeq ($(OS), Windows_NT)
+export PROTOC = /mingw32/bin/protoc
+export CC = /mingw32/bin/gcc
 export CXX = /mingw32/bin/g++
-export AR = /mingw32/bin/ar rcs
+export AR = /mingw32/bin/ar rc
+export RANLIB = /mingw32/bin/ranlib
 export STRIP = /mingw32/bin/strip
-export CFLAGS += -I/mingw32/include/libusb-1.0
+export CFLAGS += -I/mingw32/include/libusb-1.0 -I/mingw32/include
 export LDFLAGS +=
-export LIBS = -static -lz -lsqlite3 -lusb-1.0
+export LIBS += -L/mingw32/lib -static -lz -lsqlite3 -lusb-1.0 -lprotobuf
 export EXTENSION = .exe
 else

@@ -20,21 +32,32 @@ $(warning These pkg-config packages are installed: $(shell pkg-config --list-all
 $(error You must have these pkg-config packages installed: $(PACKAGES))
 endif

+export PROTOC = protoc
+export CC = gcc
 export CXX = g++
-export AR = ar rcs
+export AR = ar rc
+export RANLIB = ranlib
 export STRIP = strip
 export CFLAGS += $(shell pkg-config --cflags $(PACKAGES))
 export LDFLAGS +=
-export LIBS = $(shell pkg-config --libs $(PACKAGES))
+export LIBS += $(shell pkg-config --libs $(PACKAGES))
 export EXTENSION =
+
+ifeq ($(shell uname),Darwin)
+AR = ar rcS
+RANLIB += -c -no_warning_for_no_symbols
 endif

+endif
+export XXD = xxd
+
 CFLAGS += -Ilib -Idep/fmt -Iarch

 export OBJDIR = .obj

 all: .obj/build.ninja
-	@ninja -f .obj/build.ninja -v
+	@ninja -f .obj/build.ninja -k 0
+	@if command -v cscope > /dev/null; then cscope -bRq; fi

 clean:
 	@echo CLEAN
--- a/README.md
+++ b/README.md
@@ -4,6 +4,11 @@ FluxEngine
 (If you're reading this on GitHub, the formatting's a bit messed up. [Try the
 version on cowlark.com instead.](http://cowlark.com/fluxengine/)

+**Breaking news!** As of 2021-05-21, the command line environment has changed
+_substantially_ (to make it more consistent and flexible, and allow some new
+backend features like multi-format IBM scheme disks, which are popular with
+CP/M). If things don't work the way you expect, please check the documentation.
+
 What?
 -----

@@ -24,17 +29,18 @@ Don't believe me? Watch the demo reel!
 <iframe width="373" height="210" src="https://www.youtube.com/embed/m_s1iw8eW7o" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 </div>

-**Important note.** On 2019-02-09 I did a hardware redesign and moved the pins on
-the board. Sorry for the inconvenience, but it means you don't have to modify
-the board any more to make it work. If you built the hardware prior to then,
-you'll need to adjust it.
+**New!** The FluxEngine client software now works with
+[GreaseWeazle](https://github.com/keirf/Greaseweazle/wiki) hardware. So, if you
+can't find a PSoC5 development kit, or don't want to use the Cypress Windows
+tools for programming it, you can use one of these instead. Very nearly all
+FluxEngine features are available with the GreaseWeazle and it works out-of-the
+box. See the [dedicated GreaseWeazle documentation page](doc/greaseweazle.md)
+for more information.

-**Another important note.** On 2019-07-03 I've revamped the build process and
-the (command line) user interface. It should be much nicer now, not least in
-that there's a single client binary with all the functionality in it. The
-interface is a little different, but not much. The build process is now
-better (simpler). See [the building](doc/building.md) and
-[using](doc/using.md) pages for more details.
+**Important note.** On 2020-04-02 I changed the bytecode format (and firmware).
+Flux files will need to be upgraded with `fluxengine upgradefluxfile`. The new
+format should be more reliable and use way, way less bandwidth. Sorry for the
+inconvenience.

 Where?
 ------
@@ -59,8 +65,15 @@ following friendly articles:
  - [Using a FluxEngine](doc/using.md) ∾ what to do with your new hardware ∾
    flux files and image files ∾ knowing what you're doing

-  - [Troubleshooting dubious disks](doc/problems.md) ∾ it's not an exact science ∾
-    the sector map ∾ clock detection and the histogram
+  - [Using GreaseWeazle hardware with the FluxEngine client
+	software](doc/greaseweazle.md) ∾ what works ∾ what doesn't work ∾ where to
+	go for help
+
+  - [Troubleshooting dubious disks](doc/problems.md) ∾ it's not an exact
+	science ∾ the sector map ∾ clock detection and the histogram
+
+  - [Checking your drive](doc/driveresponse.md) ∾ you can't do that with that ∾
+	measuring your drive's ability to work with exotic formats

 Which?
 ------
@@ -77,22 +90,26 @@ people who've had it work).

 ### Old disk formats

-| Format                                   | Read? | Write? | Notes |
-|:-----------------------------------------|:-----:|:------:|-------|
-| IBM PC compatible                        |  🦄   |        | and compatibles (like the Atari ST) |
-| [Acorn ADFS](doc/disk-acornadfs.md)      |  🦄   |        | single- and double- sided           |
-| [Acorn DFS](doc/disk-acorndfs.md)        |  🦄   |        |                                     |
-| [Ampro Little Board](doc/disk-ampro.md)  |  🦖   |        |                                     |
-| [Apple II DOS 3.3](doc/disk-apple2.md)   |  🦄   |        | doesn't do logical sector remapping |
-| [Amiga](doc/disk-amiga.md)               |  🦄   |        |                                     |
-| [Commodore 64 1541](doc/disk-c64.md)     |  🦖   |        | and probably the other GCR formats  |
-| [Brother 120kB](doc/disk-brother.md)     |  🦄   |        |                                     |
-| [Brother 240kB](doc/disk-brother.md)     |  🦄   |   🦄   |                                     |
-| [Brother FB-100](doc/disk-fb100.md)      |  🦖   |        | Tandy Model 100, Husky Hunter, knitting machines |
-| [Macintosh 800kB](doc/disk-macintosh.md) |  🦖   |        | and probably the 400kB too          |
-| [TRS-80](doc/disk-trs80.md)              |  🦖   |        | a minor variation of the IBM scheme |
+| Format                                    | Read? | Write? | Notes |
+|:------------------------------------------|:-----:|:------:|-------|
+| [IBM PC compatible](doc/disk-ibm.md)      |  🦄   |   🦄   | and compatibles (like the Atari ST) |
+| [Acorn ADFS](doc/disk-acornadfs.md)       |  🦄   |   🦖*  | single- and double- sided           |
+| [Acorn DFS](doc/disk-acorndfs.md)         |  🦄   |   🦖*  |                                     |
+| [Ampro Little Board](doc/disk-ampro.md)   |  🦖   |   🦖*  |                                     |
+| [Apple II DOS 3.3](doc/disk-apple2.md)    |  🦄   |        | doesn't do logical sector remapping |
+| [Amiga](doc/disk-amiga.md)                |  🦄   |   🦄   |                                     |
+| [Commodore 64 1541/1581](doc/disk-c64.md) |  🦄   |   🦄   | and probably the other formats      |
+| [Brother 120kB](doc/disk-brother.md)      |  🦄   |   🦖   |                                     |
+| [Brother 240kB](doc/disk-brother.md)      |  🦄   |   🦄   |                                     |
+| [Brother FB-100](doc/disk-fb100.md)       |  🦖   |        | Tandy Model 100, Husky Hunter, knitting machines |
+| [Macintosh 800kB](doc/disk-macintosh.md)  |  🦄   |   🦄   | and probably the 400kB too          |
+| [TRS-80](doc/disk-trs80.md)               |  🦖   |   🦖*  | a minor variation of the IBM scheme |
 {: .datatable }

+`*`: these formats are variations of the generic IBM format, and since the
+IBM writer is completely generic, it should be configurable for these
+formats... theoretically. I don't have the hardware to try it.
+
 ### Even older disk formats

 These formats are for particularly old, weird architectures, even by the
@@ -106,8 +123,12 @@ at least, check the CRC so what data's there is probably good.
 | [AES Superplus / No Problem](doc/disk-aeslanier.md) |  🦖   | | hard sectors! |
 | [Durango F85](doc/disk-durangof85.md)    |  🦖   |        | 5.25" |
 | [DVK MX](doc/disk-mx.md)                 |  🦖   |        | Soviet PDP-11 clone |
-| [Victor 9000](doc/disk-victor9k.md)      |  🦖   |        | 8-inch        |
-| [Zilog MCZ](doc/disk-zilogmcz.md)        |  🦖   |        | 8-inch _and_ hard sectors |
+| [VDS Eco1](doc/disk-eco1.md)             |  🦖   |        | 8" mixed format |
+| [Micropolis](doc/disk-micropolis.md)     |  🦄   |        | Micropolis 100tpi drives |
+| [Northstar(doc/disk-northstar.md)        |  🦖   |   🦖   | 5.25" hard sectors |
+| [TI DS990 FD1000](doc/disk-tids990.md)   |  🦄   |  🦄    | 8" |
+| [Victor 9000](doc/disk-victor9k.md)      |  🦖   |        | 8" |
+| [Zilog MCZ](doc/disk-zilogmcz.md)        |  🦖   |        | 8" _and_ hard sectors |
 {: .datatable }

 ### Notes
@@ -191,6 +212,25 @@ contributions from many other people. It is licensed under the terms of the
 BSD license. Please see the contents of the directory for the full text.

 As an exception, `dep/emu` contains parts of the OpenBSD C library
-code, Todd Miller and William A. Rowe (and probably others). It is licensed
+code, maintained by Todd Miller and William A. Rowe (and probably others). It is licensed
 under the terms of the 3-clause BSD license. Please see the contents of the
 directory for the full text. It's been lightly modified by me.
+
+As an exception, `dep/agg` contains parts of the Anti-Grain Antialiasing
+library, written by Maxim Semanarev (and others). It is licensed under the
+terms of the 3-clause BSD license. Please see the contents of the directory for
+the full text. It's been lightly modified by me.
+
+As an exception, `dep/stb` contains parts of the libstb utility library,
+written by Sean T Barett (and others). It is public domain/Unlicense/MIT
+licensed, at your choice. Please see the contents of the directory for the full
+text.
+
+As an exception, `dep/snowhouse` contains the snowhouse assertion library,
+taken from https://github.com/banditcpp/snowhouse. It is Boost Standard License
+1.0 licensed. Please see the contents of the directory for the full text.
+
+As an exception, `dep/libui` contains the libui GUI library, taken from
+https://github.com/andlabs/libui. It is MIT licensed. Please see the contents
+of the directory for the full text.
+
--- a/arch/aeslanier/aeslanier.h
+++ b/arch/aeslanier/aeslanier.h
@@ -5,16 +5,6 @@
 #define AESLANIER_SECTOR_LENGTH    256
 #define AESLANIER_RECORD_SIZE      (AESLANIER_SECTOR_LENGTH + 5)

-class Sector;
-class Fluxmap;
-
-class AesLanierDecoder : public AbstractDecoder
-{
-public:
-    virtual ~AesLanierDecoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createAesLanierDecoder(const DecoderProto& config);

 #endif
--- a/arch/aeslanier/aeslanier.proto
+++ b/arch/aeslanier/aeslanier.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message AesLanierDecoderProto {}
+
--- a/arch/aeslanier/decoder.cc
+++ b/arch/aeslanier/decoder.cc
@@ -6,7 +6,6 @@
 #include "decoders/fluxmapreader.h"
 #include "sector.h"
 #include "bytes.h"
-#include "record.h"
 #include "fmt/format.h"
 #include <string.h>

@@ -24,42 +23,57 @@ static Bytes reverse_bits(const Bytes& input)
    return output;
 }

-AbstractDecoder::RecordType AesLanierDecoder::advanceToNextRecord()
+class AesLanierDecoder : public AbstractDecoder
 {
-    _sector->clock = _fmr->seekToPattern(SECTOR_PATTERN);
-    if (_fmr->eof() || !_sector->clock)
-        return UNKNOWN_RECORD;
-    return SECTOR_RECORD;
+public:
+	AesLanierDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		_sector->clock = _fmr->seekToPattern(SECTOR_PATTERN);
+		if (_fmr->eof() || !_sector->clock)
+			return UNKNOWN_RECORD;
+		return SECTOR_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		/* Skip ID mark. */
+
+		readRawBits(16);
+
+		const auto& rawbits = readRawBits(AESLANIER_RECORD_SIZE*16);
+		const auto& bytes = decodeFmMfm(rawbits).slice(0, AESLANIER_RECORD_SIZE);
+		const auto& reversed = reverse_bits(bytes);
+
+		_sector->logicalTrack = reversed[1];
+		_sector->logicalSide = 0;
+		_sector->logicalSector = reversed[2];
+
+		/* Check header 'checksum' (which seems far too simple to mean much). */
+
+		{
+			uint8_t wanted = reversed[3];
+			uint8_t got = reversed[1] + reversed[2];
+			if (wanted != got)
+				return;
+		}
+
+		/* Check data checksum, which also includes the header and is
+			* significantly better. */
+
+		_sector->data = reversed.slice(1, AESLANIER_SECTOR_LENGTH);
+		uint16_t wanted = reversed.reader().seek(0x101).read_le16();
+		uint16_t got = crc16ref(MODBUS_POLY_REF, _sector->data);
+		_sector->status = (wanted == got) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createAesLanierDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new AesLanierDecoder(config));
 }

-void AesLanierDecoder::decodeSectorRecord()
-{
-    /* Skip ID mark. */

-    readRawBits(16);
-
-    const auto& rawbits = readRawBits(AESLANIER_RECORD_SIZE*16);
-    const auto& bytes = decodeFmMfm(rawbits).slice(0, AESLANIER_RECORD_SIZE);
-    const auto& reversed = reverse_bits(bytes);
-
-    _sector->logicalTrack = reversed[1];
-    _sector->logicalSide = 0;
-    _sector->logicalSector = reversed[2];
-
-    /* Check header 'checksum' (which seems far too simple to mean much). */
-
-    {
-        uint8_t wanted = reversed[3];
-        uint8_t got = reversed[1] + reversed[2];
-        if (wanted != got)
-            return;
-    }
-
-    /* Check data checksum, which also includes the header and is
-        * significantly better. */
-
-    _sector->data = reversed.slice(1, AESLANIER_SECTOR_LENGTH);
-    uint16_t wanted = reversed.reader().seek(0x101).read_le16();
-    uint16_t got = crc16ref(MODBUS_POLY_REF, _sector->data);
-    _sector->status = (wanted == got) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/amiga/amiga.cc
+++ b/arch/amiga/amiga.cc
@@ -1,5 +1,4 @@
 #include "globals.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "amiga.h"
 #include "bytes.h"
--- a/arch/amiga/amiga.h
+++ b/arch/amiga/amiga.h
@@ -9,29 +9,8 @@
 #define AMIGA_SECTORS_PER_TRACK 11
 #define AMIGA_RECORD_SIZE 0x21f

-class Sector;
-class Fluxmap;
-class SectorSet;
-
-class AmigaDecoder : public AbstractDecoder
-{
-public:
-    virtual ~AmigaDecoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-};
-
-class AmigaEncoder : public AbstractEncoder
-{
-public:
-	virtual ~AmigaEncoder() {}
-
-public:
-    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide, const SectorSet& allSectors);
-};
-
-extern FlagGroup amigaEncoderFlags;
+extern std::unique_ptr<AbstractDecoder> createAmigaDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createAmigaEncoder(const EncoderProto& config);

 extern uint32_t amigaChecksum(const Bytes& bytes);
 extern Bytes amigaInterleave(const Bytes& input);
--- a/arch/amiga/amiga.proto
+++ b/arch/amiga/amiga.proto
@@ -0,0 +1,13 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+message AmigaDecoderProto {}
+
+message AmigaEncoderProto {
+	optional double clock_rate_us = 1
+		[default=2.00, (help)="Encoded data clock rate."];
+	optional double post_index_gap_ms = 2
+		[default=0.5, (help)="Post-index gap before first sector header."];
+}
+
--- a/arch/amiga/decoder.cc
+++ b/arch/amiga/decoder.cc
@@ -2,12 +2,12 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "amiga.h"
 #include "bytes.h"
 #include "fmt/format.h"
+#include "lib/decoders/decoders.pb.h"
 #include <string.h>
 #include <algorithm>

@@ -21,38 +21,65 @@
         
 static const FluxPattern SECTOR_PATTERN(48, AMIGA_SECTOR_RECORD);

-AbstractDecoder::RecordType AmigaDecoder::advanceToNextRecord()
+class AmigaDecoder : public AbstractDecoder
 {
-    _sector->clock = _fmr->seekToPattern(SECTOR_PATTERN);
-    if (_fmr->eof() || !_sector->clock)
-        return UNKNOWN_RECORD;
-    return SECTOR_RECORD;
+public:
+	AmigaDecoder(const DecoderProto& config):
+		AbstractDecoder(config),
+		_config(config.amiga())
+	{}
+
+    RecordType advanceToNextRecord() override
+	{
+		_sector->clock = _fmr->seekToPattern(SECTOR_PATTERN);
+		if (_fmr->eof() || !_sector->clock)
+			return UNKNOWN_RECORD;
+		return SECTOR_RECORD;
+	}
+
+    void decodeSectorRecord() override
+	{
+		const auto& rawbits = readRawBits(AMIGA_RECORD_SIZE*16);
+		if (rawbits.size() < (AMIGA_RECORD_SIZE*16))
+			return;
+		const auto& rawbytes = toBytes(rawbits).slice(0, AMIGA_RECORD_SIZE*2);
+		const auto& bytes = decodeFmMfm(rawbits).slice(0, AMIGA_RECORD_SIZE);
+
+		const uint8_t* ptr = bytes.begin() + 3;
+
+		Bytes header = amigaDeinterleave(ptr, 4);
+		Bytes recoveryinfo = amigaDeinterleave(ptr, 16);
+
+		_sector->logicalTrack = header[1] >> 1;
+		_sector->logicalSide = header[1] & 1;
+		_sector->logicalSector = header[2];
+
+		uint32_t wantedheaderchecksum = amigaDeinterleave(ptr, 4).reader().read_be32();
+		uint32_t gotheaderchecksum = amigaChecksum(rawbytes.slice(6, 40));
+		if (gotheaderchecksum != wantedheaderchecksum)
+			return;
+
+		uint32_t wanteddatachecksum = amigaDeinterleave(ptr, 4).reader().read_be32();
+		uint32_t gotdatachecksum = amigaChecksum(rawbytes.slice(62, 1024));
+
+		Bytes data;
+		data.writer().append(amigaDeinterleave(ptr, 512)).append(recoveryinfo);
+		_sector->data = data;
+		_sector->status = (gotdatachecksum == wanteddatachecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+
+	std::set<unsigned> requiredSectors(unsigned cylinder, unsigned head) const override
+	{
+		static std::set<unsigned> sectors = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+		return sectors;
+	}
+
+private:
+	const AmigaDecoderProto& _config;
+};
+
+std::unique_ptr<AbstractDecoder> createAmigaDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new AmigaDecoder(config));
 }

-void AmigaDecoder::decodeSectorRecord()
-{
-    const auto& rawbits = readRawBits(AMIGA_RECORD_SIZE*16);
-    const auto& rawbytes = toBytes(rawbits).slice(0, AMIGA_RECORD_SIZE*2);
-    const auto& bytes = decodeFmMfm(rawbits).slice(0, AMIGA_RECORD_SIZE);
-
-    const uint8_t* ptr = bytes.begin() + 3;
-
-    Bytes header = amigaDeinterleave(ptr, 4);
-    Bytes recoveryinfo = amigaDeinterleave(ptr, 16);
-
-    _sector->logicalTrack = header[1] >> 1;
-    _sector->logicalSide = header[1] & 1;
-    _sector->logicalSector = header[2];
-
-    uint32_t wantedheaderchecksum = amigaDeinterleave(ptr, 4).reader().read_be32();
-    uint32_t gotheaderchecksum = amigaChecksum(rawbytes.slice(6, 40));
-    if (gotheaderchecksum != wantedheaderchecksum)
-        return;
-
-    uint32_t wanteddatachecksum = amigaDeinterleave(ptr, 4).reader().read_be32();
-    uint32_t gotdatachecksum = amigaChecksum(rawbytes.slice(62, 1024));
-
-    _sector->data.clear();
-    _sector->data.writer().append(amigaDeinterleave(ptr, 512)).append(recoveryinfo);
-    _sector->status = (gotdatachecksum == wanteddatachecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/amiga/encoder.cc
+++ b/arch/amiga/encoder.cc
@@ -1,23 +1,14 @@
 #include "globals.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "encoders/encoders.h"
 #include "amiga.h"
 #include "crc.h"
-#include "sectorset.h"
 #include "writer.h"
+#include "image.h"
+#include "arch/amiga/amiga.pb.h"
+#include "lib/encoders/encoders.pb.h"

-FlagGroup amigaEncoderFlags;
-
-static DoubleFlag clockRateUs(
-	{ "--clock-rate" },
-	"Encoded data clock rate (microseconds).",
-	2.00);
-
-static DoubleFlag postIndexGapMs(
-	{ "--post-index-gap" },
-	"Post-index gap before first sector header (milliseconds).",
-	0.5);
+static bool lastBit;

 static int charToInt(char c)
 {
@@ -31,13 +22,14 @@ static void write_bits(std::vector<bool>& bits, unsigned& cursor, const std::vec
 	for (bool bit : src)
 	{
 		if (cursor < bits.size())
-			bits[cursor++] = bit;
+			lastBit = bits[cursor++] = bit;
 	}
 }

 static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
 {
 	cursor += width;
+	lastBit = data & 1;
 	for (int i=0; i<width; i++)
 	{
 		unsigned pos = cursor - i - 1;
@@ -47,31 +39,44 @@ static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data,
 	}
 }

-static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, const Bytes& bytes)
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, const Bytes& bytes)
 {
-	assert(!(bytes.size() & 3));
-	Bytes interleaved = amigaInterleave(bytes);
-	encodeMfm(bits, cursor, interleaved);
+	ByteReader br(bytes);
+	BitReader bitr(br);
+
+	while (!bitr.eof())
+	{
+		if (cursor < bits.size())
+			bits[cursor++] = bitr.get();
+	}
 }

-static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, uint32_t data)
-{
-	Bytes b(4);
-	ByteWriter bw(b);
-	bw.write_be32(data);
-	write_interleaved_bytes(bits, cursor, b);
-}
-
-static void write_sector(std::vector<bool>& bits, unsigned& cursor, const Sector* sector)
+static void write_sector(std::vector<bool>& bits, unsigned& cursor, const std::shared_ptr<Sector>& sector)
 {
 	if ((sector->data.size() != 512) && (sector->data.size() != 528))
 		Error() << "unsupported sector size --- you must pick 512 or 528";

+	uint32_t checksum = 0;
+
+	auto write_interleaved_bytes = [&](const Bytes& bytes)
+	{
+		Bytes interleaved = amigaInterleave(bytes);
+		Bytes mfm = encodeMfm(interleaved, lastBit);
+		checksum ^= amigaChecksum(mfm);
+		checksum &= 0x55555555;
+		write_bits(bits, cursor, mfm);
+	};
+
+	auto write_interleaved_word = [&](uint32_t word)
+	{
+		Bytes b(4);
+		b.writer().write_be32(word);
+		write_interleaved_bytes(b);
+	};
+
    write_bits(bits, cursor, AMIGA_SECTOR_RECORD, 6*8);

-	std::vector<bool> headerBits(20*16);
-	unsigned headerCursor = 0;
-
+	checksum = 0;
 	Bytes header = 
 		{
 			0xff, /* Amiga 1.0 format byte */
@@ -79,48 +84,79 @@ static void write_sector(std::vector<bool>& bits, unsigned& cursor, const Sector
 			(uint8_t) sector->logicalSector,
 			(uint8_t) (AMIGA_SECTORS_PER_TRACK - sector->logicalSector)
 		};
-	write_interleaved_bytes(headerBits, headerCursor, header);
+	write_interleaved_bytes(header);
 	Bytes recoveryInfo(16);
 	if (sector->data.size() == 528)
 		recoveryInfo = sector->data.slice(512, 16);
-	write_interleaved_bytes(headerBits, headerCursor, recoveryInfo);
+	write_interleaved_bytes(recoveryInfo);
+	write_interleaved_word(checksum);

-	std::vector<bool> dataBits(512*16);
-	unsigned dataCursor = 0;
-	write_interleaved_bytes(dataBits, dataCursor, sector->data);
-
-	write_bits(bits, cursor, headerBits);
-	uint32_t headerChecksum = amigaChecksum(toBytes(headerBits));
-	write_interleaved_bytes(bits, cursor, headerChecksum);
-	uint32_t dataChecksum = amigaChecksum(toBytes(dataBits));
-	write_interleaved_bytes(bits, cursor, dataChecksum);
-	write_bits(bits, cursor, dataBits);
+	Bytes data = sector->data.slice(0, 512);
+	write_interleaved_word(amigaChecksum(encodeMfm(amigaInterleave(data), lastBit)));
+	write_interleaved_bytes(data);
 }

-std::unique_ptr<Fluxmap> AmigaEncoder::encode(
-	int physicalTrack, int physicalSide, const SectorSet& allSectors)
+class AmigaEncoder : public AbstractEncoder
 {
-	if ((physicalTrack < 0) || (physicalTrack >= AMIGA_TRACKS_PER_DISK))
-		return std::unique_ptr<Fluxmap>();
+public:
+	AmigaEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.amiga()) {}

-	int bitsPerRevolution = 200000.0 / clockRateUs;
-	std::vector<bool> bits(bitsPerRevolution);
-	unsigned cursor = 0;
-
-    fillBitmapTo(bits, cursor, postIndexGapMs * 1000 / clockRateUs, { true, false });
-
-	for (int sectorId=0; sectorId<AMIGA_SECTORS_PER_TRACK; sectorId++)
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
 	{
-		const auto& sectorData = allSectors.get(physicalTrack, physicalSide, sectorId);
-		write_sector(bits, cursor, sectorData);
-    }
+		std::vector<std::shared_ptr<Sector>> sectors;

-	if (cursor >= bits.size())
-		Error() << "track data overrun";
-	fillBitmapTo(bits, cursor, bits.size(), { true, false });
+		if ((physicalTrack >= 0) && (physicalTrack < AMIGA_TRACKS_PER_DISK))
+		{
+			for (int sectorId=0; sectorId<AMIGA_SECTORS_PER_TRACK; sectorId++)
+			{
+				const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+				if (sector)
+					sectors.push_back(sector);
+			}
+		}

-	std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
-	fluxmap->appendBits(bits, clockRateUs*1e3);
-	return fluxmap;
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		if ((physicalTrack < 0) || (physicalTrack >= AMIGA_TRACKS_PER_DISK))
+			return std::unique_ptr<Fluxmap>();
+
+		int bitsPerRevolution = 200000.0 / _config.clock_rate_us();
+		std::vector<bool> bits(bitsPerRevolution);
+		unsigned cursor = 0;
+
+		fillBitmapTo(bits, cursor, _config.post_index_gap_ms() * 1000 / _config.clock_rate_us(), { true, false });
+		lastBit = false;
+
+		for (int sectorId=0; sectorId<AMIGA_SECTORS_PER_TRACK; sectorId++)
+		{
+			const auto& sectorData = image.get(physicalTrack, physicalSide, sectorId);
+			if (sectorData)
+				write_sector(bits, cursor, sectorData);
+		}
+
+		if (cursor >= bits.size())
+			Error() << "track data overrun";
+		fillBitmapTo(bits, cursor, bits.size(), { true, false });
+
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(bits, _config.clock_rate_us()*1e3);
+		return fluxmap;
+	}
+
+private:
+	const AmigaEncoderProto& _config;
+};
+
+std::unique_ptr<AbstractEncoder> createAmigaEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new AmigaEncoder(config));
 }

+
--- a/arch/apple2/apple2.h
+++ b/arch/apple2/apple2.h
@@ -7,19 +7,7 @@
 #define APPLE2_SECTOR_LENGTH   256
 #define APPLE2_ENCODED_SECTOR_LENGTH 342

-class Sector;
-class Fluxmap;
-
-class Apple2Decoder : public AbstractDecoder
-{
-public:
-    virtual ~Apple2Decoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
-
+extern std::unique_ptr<AbstractDecoder> createApple2Decoder(const DecoderProto& config);

 #endif

--- a/arch/apple2/apple2.proto
+++ b/arch/apple2/apple2.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message Apple2DecoderProto {}
+
--- a/arch/apple2/decoder.cc
+++ b/arch/apple2/decoder.cc
@@ -2,7 +2,6 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "apple2.h"
@@ -25,7 +24,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 /* This is extremely inspired by the MESS implementation, written by Nathan Woods
 * and R. Belmont: https://github.com/mamedev/mame/blob/7914a6083a3b3a8c243ae6c3b8cb50b023f21e0e/src/lib/formats/ap2_dsk.cpp
@@ -60,53 +59,68 @@ static Bytes decode_crazy_data(const uint8_t* inp, Sector::Status& status)
    return output;
 }

-uint8_t combine(uint16_t word)
+static uint8_t combine(uint16_t word)
 {
    return word & (word >> 7);
 }

-AbstractDecoder::RecordType Apple2Decoder::advanceToNextRecord()
+class Apple2Decoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return RecordType::SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return RecordType::DATA_RECORD;
-	return RecordType::UNKNOWN_RECORD;
+public:
+	Apple2Decoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return RecordType::DATA_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		/* Skip ID (as we know it's a APPLE2_SECTOR_RECORD). */
+		readRawBits(24);
+
+		/* Read header. */
+
+		auto header = toBytes(readRawBits(8*8)).slice(0, 8);
+		ByteReader br(header);
+
+		uint8_t volume = combine(br.read_be16());
+		_sector->logicalTrack = combine(br.read_be16());
+		_sector->logicalSector = combine(br.read_be16());
+		uint8_t checksum = combine(br.read_be16());
+		if (checksum == (volume ^ _sector->logicalTrack ^ _sector->logicalSector))
+			_sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	}
+
+    void decodeDataRecord()
+	{
+		/* Check ID. */
+
+		Bytes bytes = toBytes(readRawBits(3*8)).slice(0, 3);
+		if (bytes.reader().read_be24() != APPLE2_DATA_RECORD)
+			return;
+
+		/* Read and decode data. */
+
+		unsigned recordLength = APPLE2_ENCODED_SECTOR_LENGTH + 2;
+		bytes = toBytes(readRawBits(recordLength*8)).slice(0, recordLength);
+
+		_sector->status = Sector::BAD_CHECKSUM;
+		_sector->data = decode_crazy_data(&bytes[0], _sector->status);
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createApple2Decoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new Apple2Decoder(config));
 }

-void Apple2Decoder::decodeSectorRecord()
-{
-    /* Skip ID (as we know it's a APPLE2_SECTOR_RECORD). */
-    readRawBits(24);

-    /* Read header. */
-
-    auto header = toBytes(readRawBits(8*8)).slice(0, 8);
-    ByteReader br(header);
-
-    uint8_t volume = combine(br.read_be16());
-    _sector->logicalTrack = combine(br.read_be16());
-    _sector->logicalSector = combine(br.read_be16());
-    uint8_t checksum = combine(br.read_be16());
-    if (checksum == (volume ^ _sector->logicalTrack ^ _sector->logicalSector))
-        _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
-}
-
-void Apple2Decoder::decodeDataRecord()
-{
-    /* Check ID. */
-
-    Bytes bytes = toBytes(readRawBits(3*8)).slice(0, 3);
-    if (bytes.reader().read_be24() != APPLE2_DATA_RECORD)
-        return;
-
-    /* Read and decode data. */
-
-    unsigned recordLength = APPLE2_ENCODED_SECTOR_LENGTH + 2;
-    bytes = toBytes(readRawBits(recordLength*8)).slice(0, recordLength);
-
-    _sector->status = Sector::BAD_CHECKSUM;
-    _sector->data = decode_crazy_data(&bytes[0], _sector->status);
-}
--- a/arch/brother/brother.h
+++ b/arch/brother/brother.h
@@ -9,31 +9,11 @@
 #define BROTHER_DATA_RECORD_CHECKSUM     3
 #define BROTHER_DATA_RECORD_ENCODED_SIZE 415

-#define BROTHER_TRACKS_PER_DISK          78
+#define BROTHER_TRACKS_PER_240KB_DISK    78
+#define BROTHER_TRACKS_PER_120KB_DISK    39
 #define BROTHER_SECTORS_PER_TRACK        12

-class Sector;
-class Fluxmap;
-
-class BrotherDecoder : public AbstractDecoder
-{
-public:
-    virtual ~BrotherDecoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
-
-class BrotherEncoder : public AbstractEncoder
-{
-public:
-	virtual ~BrotherEncoder() {}
-
-public:
-    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide, const SectorSet& allSectors);
-};
-
-extern FlagGroup brotherEncoderFlags;
+extern std::unique_ptr<AbstractDecoder> createBrotherDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createBrotherEncoder(const EncoderProto& config);

 #endif
--- a/arch/brother/brother.proto
+++ b/arch/brother/brother.proto
@@ -0,0 +1,20 @@
+syntax = "proto2";
+
+message BrotherDecoderProto {}
+
+enum BrotherFormat {
+	BROTHER240 = 0;
+	BROTHER120 = 1;
+};
+
+message BrotherEncoderProto {
+	optional double clock_rate_us = 1 [default = 3.83];
+	optional double post_index_gap_ms = 2 [default = 1.0];
+	optional double sector_spacing_ms = 3 [default = 16.2];
+	optional double post_header_spacing_ms = 4 [default = 0.69];
+	optional string sector_skew = 5 [default = "05a3816b4927"];
+
+	optional BrotherFormat format = 6 [default = BROTHER240];
+	optional int32 bias = 7 [default = 0];
+}
+
--- a/arch/brother/brotherdecode.h
+++ b/arch/brother/brotherdecode.h
@@ -1,28 +0,0 @@
-#ifndef BROTHER_H
-#define BROTHER_H
-
-/* Brother word processor format (or at least, one of them) */
-
-#define BROTHER_SECTOR_RECORD 0xFFFFFD57
-#define BROTHER_DATA_RECORD   0xFFFFFDDB
-#define BROTHER_DATA_RECORD_PAYLOAD  256
-#define BROTHER_DATA_RECORD_CHECKSUM 3
-
-class Sector;
-class Fluxmap;
-
-class BrotherDecoder : public AbstractDecoder
-{
-public:
-    virtual ~BrotherDecoder() {}
-
-    SectorVector decodeToSectors(const RawRecordVector& rawRecords);
-    int recordMatcher(uint64_t fifo) const;
-};
-
-extern void writeBrotherSectorHeader(std::vector<bool>& bits, unsigned& cursor,
-		int track, int sector);
-extern void writeBrotherSectorData(std::vector<bool>& bits, unsigned& cursor,
-		const std::vector<uint8_t>& data);
-
-#endif
--- a/arch/brother/decoder.cc
+++ b/arch/brother/decoder.cc
@@ -4,7 +4,6 @@
 #include "decoders/fluxmapreader.h"
 #include "decoders/decoders.h"
 #include "encoders/encoders.h"
-#include "record.h"
 #include "brother.h"
 #include "sector.h"
 #include "bytes.h"
@@ -40,7 +39,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 static int decode_header_gcr(uint16_t word)
 {
@@ -52,58 +51,73 @@ static int decode_header_gcr(uint16_t word)
 		#undef GCR_ENTRY
 	}                       
 	return -1;             
+}
+
+class BrotherDecoder : public AbstractDecoder
+{
+public:
+    BrotherDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return RecordType::DATA_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		readRawBits(32);
+		const auto& rawbits = readRawBits(32);
+		const auto& bytes = toBytes(rawbits).slice(0, 4);
+
+		ByteReader br(bytes);
+		_sector->logicalTrack = decode_header_gcr(br.read_be16());
+		_sector->logicalSector = decode_header_gcr(br.read_be16());
+
+		/* Sanity check the values read; there's no header checksum and
+			* occasionally we get garbage due to bit errors. */
+		if (_sector->logicalSector > 11)
+			return;
+		if (_sector->logicalTrack > 79)
+			return;
+
+		_sector->status = Sector::DATA_MISSING;
+	}
+	
+    void decodeDataRecord()
+	{
+		readRawBits(32);
+
+		const auto& rawbits = readRawBits(BROTHER_DATA_RECORD_ENCODED_SIZE*8);
+		const auto& rawbytes = toBytes(rawbits).slice(0, BROTHER_DATA_RECORD_ENCODED_SIZE);
+
+		Bytes bytes;
+		ByteWriter bw(bytes);
+		BitWriter bitw(bw);
+		for (uint8_t b : rawbytes)
+		{
+			uint32_t nibble = decode_data_gcr(b);
+			bitw.push(nibble, 5);
+		}
+		bitw.flush();
+
+		_sector->data = bytes.slice(0, BROTHER_DATA_RECORD_PAYLOAD);
+		uint32_t realCrc = crcbrother(_sector->data);
+		uint32_t wantCrc = bytes.reader().seek(BROTHER_DATA_RECORD_PAYLOAD).read_be24();
+		_sector->status = (realCrc == wantCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
 };

-AbstractDecoder::RecordType BrotherDecoder::advanceToNextRecord()
+std::unique_ptr<AbstractDecoder> createBrotherDecoder(const DecoderProto& config)
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return RecordType::SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return RecordType::DATA_RECORD;
-	return RecordType::UNKNOWN_RECORD;
+	return std::unique_ptr<AbstractDecoder>(new BrotherDecoder(config));
 }

-void BrotherDecoder::decodeSectorRecord()
-{
-	readRawBits(32);
-	const auto& rawbits = readRawBits(32);
-	const auto& bytes = toBytes(rawbits).slice(0, 4);

-	ByteReader br(bytes);
-	_sector->logicalTrack = decode_header_gcr(br.read_be16());
-	_sector->logicalSector = decode_header_gcr(br.read_be16());
-
-	/* Sanity check the values read; there's no header checksum and
-		* occasionally we get garbage due to bit errors. */
-	if (_sector->logicalSector > 11)
-		return;
-	if (_sector->logicalTrack > 79)
-		return;
-
-	_sector->status = Sector::DATA_MISSING;
-}
-
-void BrotherDecoder::decodeDataRecord()
-{
-	readRawBits(32);
-
-	const auto& rawbits = readRawBits(BROTHER_DATA_RECORD_ENCODED_SIZE*8);
-	const auto& rawbytes = toBytes(rawbits).slice(0, BROTHER_DATA_RECORD_ENCODED_SIZE);
-
-	Bytes bytes;
-	ByteWriter bw(bytes);
-	BitWriter bitw(bw);
-	for (uint8_t b : rawbytes)
-	{
-		uint32_t nibble = decode_data_gcr(b);
-		bitw.push(nibble, 5);
-	}
-	bitw.flush();
-
-	_sector->data = bytes.slice(0, BROTHER_DATA_RECORD_PAYLOAD);
-	uint32_t realCrc = crcbrother(_sector->data);
-	uint32_t wantCrc = bytes.reader().seek(BROTHER_DATA_RECORD_PAYLOAD).read_be24();
-	_sector->status = (realCrc == wantCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/brother/encoder.cc
+++ b/arch/brother/encoder.cc
@@ -1,38 +1,12 @@
 #include "globals.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "encoders/encoders.h"
 #include "brother.h"
 #include "crc.h"
-#include "sectorset.h"
 #include "writer.h"
-
-FlagGroup brotherEncoderFlags;
-
-static DoubleFlag clockRateUs(
-	{ "--clock-rate" },
-	"Encoded data clock rate (microseconds).",
-	3.83);
-
-static DoubleFlag postIndexGapMs(
-	{ "--post-index-gap" },
-	"Post-index gap before first sector header (milliseconds).",
-	1.0);
-
-static DoubleFlag sectorSpacingMs(
-	{ "--sector-spacing" },
-	"Time between successive sector headers (milliseconds).",
-	16.2);
-
-static DoubleFlag postHeaderSpacingMs(
-	{ "--post-header-spacing" },
-	"Time between a sector's header and data records (milliseconds).",
-	0.69);
-
-static StringFlag sectorSkew(
-	{ "--sector-skew" },
-	"Order in which to write sectors.",
-	"05a3816b4927");
+#include "image.h"
+#include "arch/brother/brother.pb.h"
+#include "lib/encoders/encoders.pb.h"

 static int encode_header_gcr(uint16_t word)
 {
@@ -44,7 +18,7 @@ static int encode_header_gcr(uint16_t word)
 		#undef GCR_ENTRY
 	}                       
 	return -1;             
-};
+}

 static int encode_data_gcr(uint8_t data)
 {
@@ -56,7 +30,7 @@ static int encode_data_gcr(uint8_t data)
 		#undef GCR_ENTRY
 	}                       
 	return -1;             
-};
+}

 static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint32_t data, int width)
 {
@@ -126,42 +100,113 @@ static int charToInt(char c)
 	return 10 + tolower(c) - 'a';
 }

-std::unique_ptr<Fluxmap> BrotherEncoder::encode(
-	int physicalTrack, int physicalSide, const SectorSet& allSectors)
+class BrotherEncoder : public AbstractEncoder
 {
-	if ((physicalTrack < 0) || (physicalTrack >= BROTHER_TRACKS_PER_DISK)
-        || (physicalSide != 0))
-		return std::unique_ptr<Fluxmap>();
+public:
+	BrotherEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.brother())
+	{}

-	int bitsPerRevolution = 200000.0 / clockRateUs;
-	const std::string& skew = sectorSkew.get();
-	std::vector<bool> bits(bitsPerRevolution);
-	unsigned cursor = 0;
-
-	for (int sectorCount=0; sectorCount<BROTHER_SECTORS_PER_TRACK; sectorCount++)
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
 	{
-		int sectorId = charToInt(skew.at(sectorCount));
-		double headerMs = postIndexGapMs + sectorCount*sectorSpacingMs;
-		unsigned headerCursor = headerMs*1e3 / clockRateUs;
-		double dataMs = headerMs + postHeaderSpacingMs;
-		unsigned dataCursor = dataMs*1e3 / clockRateUs;
+		std::vector<std::shared_ptr<Sector>> sectors;

-		const auto& sectorData = allSectors.get(physicalTrack, 0, sectorId);
+		int logicalTrack;
+		if (physicalSide != 0)
+			return sectors;
+		physicalTrack -= _config.bias();
+		switch (_config.format())
+		{
+			case BROTHER120:
+				if ((physicalTrack < 0) || (physicalTrack >= (BROTHER_TRACKS_PER_120KB_DISK*2))
+						|| (physicalTrack & 1))
+					return sectors;
+				logicalTrack = physicalTrack/2;
+				break;

-		fillBitmapTo(bits, cursor, headerCursor, { true, false });
-		write_sector_header(bits, cursor, physicalTrack, sectorId);
-		fillBitmapTo(bits, cursor, dataCursor, { true, false });
-		write_sector_data(bits, cursor, sectorData->data);
+			case BROTHER240:
+				if ((physicalTrack < 0) || (physicalTrack >= BROTHER_TRACKS_PER_240KB_DISK))
+					return sectors;
+				logicalTrack = physicalTrack;
+				break;
+		}
+
+        for (int sectorId=0; sectorId<BROTHER_SECTORS_PER_TRACK; sectorId++)
+        {
+            const auto& sector = image.get(logicalTrack, 0, sectorId);
+            if (sector)
+                sectors.push_back(sector);
+		}
+
+		return sectors;
 	}

-	if (cursor >= bits.size())
-		Error() << "track data overrun";
-	fillBitmapTo(bits, cursor, bits.size(), { true, false });
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		int logicalTrack;
+		if (physicalSide != 0)
+			return std::unique_ptr<Fluxmap>();
+		physicalTrack -= _config.bias();
+		switch (_config.format())
+		{
+			case BROTHER120:
+				if ((physicalTrack < 0) || (physicalTrack >= (BROTHER_TRACKS_PER_120KB_DISK*2))
+						|| (physicalTrack & 1))
+					return std::unique_ptr<Fluxmap>();
+				logicalTrack = physicalTrack/2;
+				break;

-	// The pre-index gap is not normally reported.
-	// std::cerr << "pre-index gap " << 200.0 - (double)cursor*clockRateUs/1e3 << std::endl;
-	
-	std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
-	fluxmap->appendBits(bits, clockRateUs*1e3);
-	return fluxmap;
+			case BROTHER240:
+				if ((physicalTrack < 0) || (physicalTrack >= BROTHER_TRACKS_PER_240KB_DISK))
+					return std::unique_ptr<Fluxmap>();
+				logicalTrack = physicalTrack;
+				break;
+		}
+
+		int bitsPerRevolution = 200000.0 / _config.clock_rate_us();
+		const std::string& skew = _config.sector_skew();
+		std::vector<bool> bits(bitsPerRevolution);
+		unsigned cursor = 0;
+
+		for (int sectorCount=0; sectorCount<BROTHER_SECTORS_PER_TRACK; sectorCount++)
+		{
+			int sectorId = charToInt(skew.at(sectorCount));
+			double headerMs = _config.post_index_gap_ms() + sectorCount*_config.sector_spacing_ms();
+			unsigned headerCursor = headerMs*1e3 / _config.clock_rate_us();
+			double dataMs = headerMs + _config.post_header_spacing_ms();
+			unsigned dataCursor = dataMs*1e3 / _config.clock_rate_us();
+
+			const auto& sectorData = image.get(logicalTrack, 0, sectorId);
+
+			fillBitmapTo(bits, cursor, headerCursor, { true, false });
+			write_sector_header(bits, cursor, logicalTrack, sectorId);
+			fillBitmapTo(bits, cursor, dataCursor, { true, false });
+			write_sector_data(bits, cursor, sectorData->data);
+		}
+
+		if (cursor >= bits.size())
+			Error() << "track data overrun";
+		fillBitmapTo(bits, cursor, bits.size(), { true, false });
+
+		// The pre-index gap is not normally reported.
+		// std::cerr << "pre-index gap " << 200.0 - (double)cursor*clockRateUs/1e3 << std::endl;
+		
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(bits, _config.clock_rate_us()*1e3);
+		return fluxmap;
+	}
+
+private:
+	const BrotherEncoderProto& _config;
+
+};
+
+std::unique_ptr<AbstractEncoder> createBrotherEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new BrotherEncoder(config));
 }
+
+
--- a/arch/c64/c64.h
+++ b/arch/c64/c64.h
@@ -1,21 +1,33 @@
 #ifndef C64_H
 #define C64_H

+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+
 #define C64_SECTOR_RECORD    0xffd49
 #define C64_DATA_RECORD      0xffd57
 #define C64_SECTOR_LENGTH    256

-class Sector;
-class Fluxmap;
+/* Source: http://www.unusedino.de/ec64/technical/formats/g64.html 
+   1. Header sync       FF FF FF FF FF (40 'on' bits, not GCR)
+   2. Header info       52 54 B5 29 4B 7A 5E 95 55 55 (10 GCR bytes)
+   3. Header gap        55 55 55 55 55 55 55 55 55 (9 bytes, never read)
+   4. Data sync         FF FF FF FF FF (40 'on' bits, not GCR)
+   5. Data block        55...4A (325 GCR bytes)
+   6. Inter-sector gap  55 55 55 55...55 55 (4 to 12 bytes, never read)
+   1. Header sync       (SYNC for the next sector)
+*/
+#define C64_HEADER_DATA_SYNC        0xFF
+#define C64_HEADER_BLOCK_ID         0x08
+#define C64_DATA_BLOCK_ID           0x07
+#define C64_HEADER_GAP              0x55
+#define C64_INTER_SECTOR_GAP        0x55
+#define C64_PADDING                 0x0F

-class Commodore64Decoder : public AbstractDecoder
-{
-public:
-    virtual ~Commodore64Decoder() {}
+#define C64_TRACKS_PER_DISK         40
+#define C64_BAM_TRACK               17

-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createCommodore64Decoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createCommodore64Encoder(const EncoderProto& config);

 #endif
--- a/arch/c64/c64.proto
+++ b/arch/c64/c64.proto
@@ -0,0 +1,13 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+message Commodore64DecoderProto {}
+
+message Commodore64EncoderProto {
+	optional double post_index_gap_us = 1 [default=0.0,
+		(help) = "post-index gap before first sector header."];
+	optional double clock_compensation_factor = 2 [default=1.0,
+		(help) = "scale the output clock by this much."];
+}
+
--- a/arch/c64/decoder.cc
+++ b/arch/c64/decoder.cc
@@ -2,7 +2,6 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "c64.h"
@@ -26,7 +25,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 static Bytes decode(const std::vector<bool>& bits)
 {
@@ -52,41 +51,56 @@ static Bytes decode(const std::vector<bool>& bits)
    return output;
 }

-AbstractDecoder::RecordType Commodore64Decoder::advanceToNextRecord()
+class Commodore64Decoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return RecordType::SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return RecordType::DATA_RECORD;
-	return RecordType::UNKNOWN_RECORD;
+public:
+	Commodore64Decoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return RecordType::DATA_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		readRawBits(20);
+
+		const auto& bits = readRawBits(5*10);
+		const auto& bytes = decode(bits).slice(0, 5);
+
+		uint8_t checksum = bytes[0];
+		_sector->logicalSector = bytes[1];
+		_sector->logicalSide = 0;
+		_sector->logicalTrack = bytes[2] - 1;
+		if (checksum == xorBytes(bytes.slice(1, 4)))
+			_sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	}
+
+    void decodeDataRecord()
+	{
+		readRawBits(20);
+
+		const auto& bits = readRawBits(259*10);
+		const auto& bytes = decode(bits).slice(0, 259);
+
+		_sector->data = bytes.slice(0, C64_SECTOR_LENGTH);
+		uint8_t gotChecksum = xorBytes(_sector->data);
+		uint8_t wantChecksum = bytes[256];
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createCommodore64Decoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new Commodore64Decoder(config));
 }

-void Commodore64Decoder::decodeSectorRecord()
-{
-    readRawBits(20);

-    const auto& bits = readRawBits(5*10);
-    const auto& bytes = decode(bits).slice(0, 5);
-
-    uint8_t checksum = bytes[0];
-    _sector->logicalSector = bytes[1];
-    _sector->logicalSide = 0;
-    _sector->logicalTrack = bytes[2] - 1;
-    if (checksum == xorBytes(bytes.slice(1, 4)))
-        _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
-}
-
-void Commodore64Decoder::decodeDataRecord()
-{
-    readRawBits(20);
-
-    const auto& bits = readRawBits(259*10);
-    const auto& bytes = decode(bits).slice(0, 259);
-
-    _sector->data = bytes.slice(0, C64_SECTOR_LENGTH);
-    uint8_t gotChecksum = xorBytes(_sector->data);
-    uint8_t wantChecksum = bytes[256];
-    _sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/c64/encoder.cc
+++ b/arch/c64/encoder.cc
@@ -0,0 +1,381 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "c64.h"
+#include "crc.h"
+#include "sector.h"
+#include "writer.h"
+#include "image.h"
+#include "fmt/format.h"
+#include "arch/c64/c64.pb.h"
+#include "lib/encoders/encoders.pb.h"
+#include <ctype.h>
+#include "bytes.h"
+
+static bool lastBit;
+
+static double clockRateUsForTrack(unsigned track)
+{
+    /*
+     * Track   # Sectors/Track Speed Zone  bits/rotation       
+     * 1 – 17          21          3       61,538.4
+     * 18 – 24         19          2       57,142.8
+     * 25 – 30         18          1       53,333.4
+     * 31 – 35         17          0       50,000.0
+    */
+    if (track < 17)
+        return 200000.0/61538.4;
+    if (track < 24)
+        return 200000.0/57142.8;
+    if (track < 30)
+        return 200000.0/53333.4;
+    return 200000.0/50000.0;
+
+}
+
+static unsigned sectorsForTrack(unsigned track)
+{
+    /*
+     * Track   Sectors/track   # Sectors   Storage in Bytes
+     *   -----   -------------   ---------   ----------------
+     *    1-17        21            357           7820
+     *   18-24        19            133           7170
+     *   25-30        18            108           6300
+     *   31-40(*)     17             85           6020
+     *                              ---
+     *                              683 (for a 35 track image)
+     */
+    if (track < 17)
+        return 21;
+    if (track < 24)
+        return 19;
+    if (track < 30)
+        return 18;
+    return 17;
+}
+
+static int encode_data_gcr(uint8_t data)
+{
+    switch (data)
+    {
+        #define GCR_ENTRY(gcr, data) \
+            case data: return gcr;
+        #include "data_gcr.h"
+        #undef GCR_ENTRY
+    }
+    return -1;
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, const std::vector<bool>& src)
+{
+    for (bool bit : src)  //Range-based for loop
+    {
+        if (cursor < bits.size())
+            bits[cursor++] = bit;
+    }
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
+{
+    cursor += width;
+    for (int i=0; i<width; i++)
+    {
+        unsigned pos = cursor - i - 1;              
+        if (pos < bits.size())
+            bits[pos] = data & 1;
+        data >>= 1;
+    }
+}
+
+void bindump(std::ostream& stream, std::vector<bool>& buffer)
+{
+    size_t pos = 0;
+
+    while ((pos < buffer.size()) and (pos <520))
+    {
+        stream << fmt::format("{:5d} : ", pos);
+        for (int i=0; i<40; i++)
+        {
+            if ((pos+i) < buffer.size())
+                stream << fmt::format("{:01b}", (buffer[pos+i]));
+            else
+                stream << "-- ";
+            if ((((pos + i + 1) % 8) == 0) and i != 0)
+                stream << "  ";
+
+        }
+        stream << std::endl;
+        pos += 40;
+    }
+}
+static std::vector<bool> encode_data(uint8_t input)
+{
+    /*
+    * Four 8-bit data bytes are converted to four 10-bit GCR bytes at a time by
+    * the 1541 DOS.  RAM is only an 8-bit storage device though. This hardware
+    * limitation prevents a 10-bit GCR byte from being stored in a single
+    * memory location. Four 10-bit GCR bytes total 40 bits - a number evenly
+    * divisible by our overriding 8-bit constraint. Commodore sub- divides the
+    * 40 GCR bits into five 8-bit bytes to solve this dilemma. This explains
+    * why four 8-bit data bytes are converted to GCR form at a time. The
+    * following step by step example demonstrates how this bit manipulation is
+    * performed by the DOS.
+    *
+    * STEP 1. Four 8-bit Data Bytes
+    * $08 $10 $00 $12
+    *
+    * STEP 2. Hexadecimal to Binary Conversion
+    * 1. Binary Equivalents
+    * $08       $10         $00         $12
+    * 00001000  00010000    00000000    00010010
+    *
+    * STEP 3. Binary to GCR Conversion
+    * 1. Four 8-bit Data Bytes
+    * 00001000 00010000 00000000 00010010
+    * 2. High and Low Nybbles
+    * 0000 1000 0001 0000 0000 0000 0001 0010
+    * 3. High and Low Nybble GCR Equivalents
+    * 01010 01001 01011 01010 01010 01010 01011 10010
+    * 4. Four 10-bit GCR Bytes
+    * 0101001001 0101101010 0101001010 0101110010
+    *
+    * STEP 4. 10-bit GCR to 8-bit GCR Conversion
+    *   1. Concatenate Four 10-bit GCR Bytes
+    *   0101001001010110101001010010100101110010
+    *   2. Five 8-bit Subdivisions
+    *   01010010 01010110 10100101 00101001 01110010
+    *
+    * STEP 5. Binary to Hexadecimal Conversion
+    * 1. Hexadecimal Equivalents
+    *   01010010    01010110    10100101    00101001    01110010
+    *   $52         $56         $A5         $29         $72
+    *
+    * STEP 6. Four 8-bit Data Bytes are Recorded as Five 8-bit GCR Bytes
+    *   $08 $10 $00 $12
+    *
+    * are recorded as
+    *   $52 $56 $A5 $29 $72
+    */
+
+    std::vector<bool> output(10, false);
+    uint8_t hi = 0;
+    uint8_t lo = 0;
+    uint8_t lo_GCR = 0;
+    uint8_t hi_GCR = 0;
+
+    //Convert the byte in high and low nibble
+    lo = input >> 4; //get the lo nibble shift the bits 4 to the right          
+    hi = input & 15; //get the hi nibble bij masking the lo bits (00001111)     
+
+
+    lo_GCR = encode_data_gcr(lo);   //example value: 0000   GCR = 01010
+    hi_GCR = encode_data_gcr(hi);   //example value: 1000   GCR = 01001
+    //output = [0,1,2,3,4,5,6,7,8,9]
+    //value  = [0,1,0,1,0,0,1,0,0,1]
+    //          01010 01001
+
+    int b = 4;
+    for (int i = 0; i < 10; i++)
+    {
+        if (i < 5) //01234
+        {       //i = 0 op 
+            output[4-i] = (lo_GCR & 1); //01010
+
+            //01010 -> & 00001 -> 00000 output[4] = 0
+            //00101 -> & 00001 -> 00001 output[3] = 1
+            //00010 -> & 00001 -> 00000 output[2] = 0
+            //00001 -> & 00001 -> 00001 output[1] = 1
+            //00000 -> & 00001 -> 00000 output[0] = 0
+            lo_GCR >>= 1;
+        } else  
+        {
+            output[i+b] = (hi_GCR & 1); //01001
+            //01001 -> & 00001 -> 00001 output[9] = 1
+            //00100 -> & 00001 -> 00000 output[8] = 0
+            //00010 -> & 00001 -> 00000 output[7] = 0
+            //00001 -> & 00001 -> 00001 output[6] = 1
+            //00000 -> & 00001 -> 00000 output[5] = 0
+            hi_GCR >>= 1;
+            b = b-2;
+        }
+    }
+    return output;
+}
+
+class Commodore64Encoder : public AbstractEncoder
+{
+public:
+	Commodore64Encoder(const EncoderProto& config):
+        AbstractEncoder(config),
+		_config(config.c64())
+	{}
+
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+        if (physicalSide == 0)
+        {
+            int logicalTrack = physicalTrack / 2;
+            unsigned numSectors = sectorsForTrack(logicalTrack);
+            for (int sectorId=0; sectorId<numSectors; sectorId++)
+            {
+                const auto& sector = image.get(logicalTrack, 0, sectorId);
+                if (sector)
+                    sectors.push_back(sector);
+            }
+        }
+
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+            const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+    {
+        /* The format ID Character # 1 and # 2 are in the .d64 image only present
+         * in track 18 sector zero which contains the BAM info in byte 162 and 163.
+         * it is written in every header of every sector and track. headers are not
+         * stored in a d64 disk image so we have to get it from track 18 which
+         * contains the BAM.
+        */
+
+        if (physicalSide != 0)
+            return std::unique_ptr<Fluxmap>();
+
+        const auto& sectorData = image.get(C64_BAM_TRACK*2, 0, 0); //Read de BAM to get the DISK ID bytes
+        if (sectorData)
+        {
+            ByteReader br(sectorData->data);
+            br.seek(162); //goto position of the first Disk ID Byte
+            _formatByte1 = br.read_8();
+            _formatByte2 = br.read_8();
+        }
+        else
+            _formatByte1 = _formatByte2 = 0;
+        
+        int logicalTrack = physicalTrack / 2;
+        double clockRateUs = clockRateUsForTrack(logicalTrack) * _config.clock_compensation_factor();
+
+        int bitsPerRevolution = 200000.0 / clockRateUs;
+
+        std::vector<bool> bits(bitsPerRevolution);
+        unsigned cursor = 0;
+
+        fillBitmapTo(bits, cursor, _config.post_index_gap_us() / clockRateUs, { true, false });
+        lastBit = false;
+
+        for (const auto& sector : sectors)
+            writeSector(bits, cursor, sector);
+
+        if (cursor >= bits.size())
+            Error() << fmt::format("track data overrun by {} bits", cursor - bits.size());
+        fillBitmapTo(bits, cursor, bits.size(), { true, false });
+
+        std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+        fluxmap->appendBits(bits, clockRateUs*1e3);
+        return fluxmap;
+    }
+
+private:
+	void writeSector(std::vector<bool>& bits, unsigned& cursor, const std::shared_ptr<Sector>& sector) const
+    {
+        /* Source: http://www.unusedino.de/ec64/technical/formats/g64.html 
+         * 1. Header sync       FF FF FF FF FF (40 'on' bits, not GCR)
+         * 2. Header info       52 54 B5 29 4B 7A 5E 95 55 55 (10 GCR bytes)
+         * 3. Header gap        55 55 55 55 55 55 55 55 55 (9 bytes, never read)
+         * 4. Data sync         FF FF FF FF FF (40 'on' bits, not GCR)
+         * 5. Data block        55...4A (325 GCR bytes)
+         * 6. Inter-sector gap  55 55 55 55...55 55 (4 to 12 bytes, never read)
+         * 1. Header sync       (SYNC for the next sector)
+        */
+        if ((sector->status == Sector::OK) or (sector->status == Sector::BAD_CHECKSUM))
+        {
+            // There is data to encode to disk.
+            if ((sector->data.size() != C64_SECTOR_LENGTH))
+                Error() << fmt::format("unsupported sector size {} --- you must pick 256", sector->data.size());    
+
+            // 1. Write header Sync (not GCR)
+            for (int i=0; i<6; i++)
+                write_bits(bits, cursor, C64_HEADER_DATA_SYNC, 1*8); /* sync */
+
+            // 2. Write Header info 10 GCR bytes
+            /*
+             * The 10 byte header info (#2) is GCR encoded and must be decoded  to
+             * it's normal 8 bytes to be understood. Once decoded, its breakdown is
+             * as follows:
+             * 
+             * Byte $00 - header block ID           ($08)
+             *   01 - header block checksum 16  (EOR of $02-$05)
+             *   02 - Sector
+             *   03 - Track
+             *   04 - Format ID byte #2
+             *   05 - Format ID byte #1
+             *   06-07 - $0F ("off" bytes)
+             */
+            uint8_t encodedTrack = ((sector->logicalTrack) + 1); // C64 track numbering starts with 1. Fluxengine with 0.
+            uint8_t encodedSector = sector->logicalSector;
+            // uint8_t formatByte1 = C64_FORMAT_ID_BYTE1;
+            // uint8_t formatByte2 = C64_FORMAT_ID_BYTE2;
+            uint8_t headerChecksum = (encodedTrack ^ encodedSector ^ _formatByte1 ^ _formatByte2);
+            write_bits(bits, cursor, encode_data(C64_HEADER_BLOCK_ID));
+            write_bits(bits, cursor, encode_data(headerChecksum));
+            write_bits(bits, cursor, encode_data(encodedSector));
+            write_bits(bits, cursor, encode_data(encodedTrack));
+            write_bits(bits, cursor, encode_data(_formatByte2));
+            write_bits(bits, cursor, encode_data(_formatByte1));
+            write_bits(bits, cursor, encode_data(C64_PADDING));
+            write_bits(bits, cursor, encode_data(C64_PADDING));
+
+            // 3. Write header GAP not GCR
+            for (int i=0; i<9; i++)
+                write_bits(bits, cursor, C64_HEADER_GAP, 1*8); /* header gap */
+
+            // 4. Write Data sync not GCR
+            for (int i=0; i<6; i++)
+                write_bits(bits, cursor, C64_HEADER_DATA_SYNC, 1*8); /* sync */
+
+            // 5. Write data block 325 GCR bytes
+            /*
+             * The 325 byte data block (#5) is GCR encoded and must be  decoded  to  its
+             * normal 260 bytes to be understood. The data block is made up of the following:
+             * 
+             * Byte    $00 - data block ID ($07)
+             *      01-100 - 256 bytes data
+             *      101 - data block checksum (EOR of $01-100)
+             *      102-103 - $00 ("off" bytes, to make the sector size a multiple of 5)
+             */
+
+            write_bits(bits, cursor, encode_data(C64_DATA_BLOCK_ID));
+            uint8_t dataChecksum = xorBytes(sector->data);
+            ByteReader br(sector->data);
+            int i = 0;
+            for (i = 0; i < C64_SECTOR_LENGTH; i++)
+            {
+                uint8_t val = br.read_8();
+                write_bits(bits, cursor, encode_data(val));     
+            }
+            write_bits(bits, cursor, encode_data(dataChecksum));
+            write_bits(bits, cursor, encode_data(C64_PADDING));
+            write_bits(bits, cursor, encode_data(C64_PADDING));
+
+            //6. Write inter-sector gap 9 - 12 bytes nor gcr
+            for (int i=0; i<9; i++)
+                write_bits(bits, cursor, C64_INTER_SECTOR_GAP, 1*8); /* sync */
+
+        }
+    }
+        
+private:
+	const Commodore64EncoderProto& _config;
+	uint8_t _formatByte1;
+	uint8_t _formatByte2;
+};
+
+std::unique_ptr<AbstractEncoder> createCommodore64Encoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new Commodore64Encoder(config));
+}
+
+// vim: sw=4 ts=4 et
+
--- a/arch/f85/decoder.cc
+++ b/arch/f85/decoder.cc
@@ -2,7 +2,6 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "f85.h"
@@ -26,7 +25,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 static Bytes decode(const std::vector<bool>& bits)
 {
@@ -52,49 +51,63 @@ static Bytes decode(const std::vector<bool>& bits)
    return output;
 }

-AbstractDecoder::RecordType DurangoF85Decoder::advanceToNextRecord()
+class DurangoF85Decoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return RecordType::SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return RecordType::DATA_RECORD;
-	return RecordType::UNKNOWN_RECORD;
+public:
+	DurangoF85Decoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return RecordType::DATA_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		/* Skip sync bits and ID byte. */
+
+		readRawBits(24);
+
+		/* Read header. */
+
+		const auto& bytes = decode(readRawBits(6*10));
+
+		_sector->logicalSector = bytes[2];
+		_sector->logicalSide = 0;
+		_sector->logicalTrack = bytes[0];
+
+		uint16_t wantChecksum = bytes.reader().seek(4).read_be16();
+		uint16_t gotChecksum = crc16(CCITT_POLY, 0xef21, bytes.slice(0, 4));
+		if (wantChecksum == gotChecksum)
+			_sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	}
+
+    void decodeDataRecord()
+	{
+		/* Skip sync bits ID byte. */
+
+		readRawBits(24);
+
+		const auto& bytes = decode(readRawBits((F85_SECTOR_LENGTH+3)*10))
+			.slice(0, F85_SECTOR_LENGTH+3);
+		ByteReader br(bytes);
+
+		_sector->data = br.read(F85_SECTOR_LENGTH);
+		uint16_t wantChecksum = br.read_be16();
+		uint16_t gotChecksum = crc16(CCITT_POLY, 0xbf84, _sector->data);
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createDurangoF85Decoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new DurangoF85Decoder(config));
 }

-void DurangoF85Decoder::decodeSectorRecord()
-{
-    /* Skip sync bits and ID byte. */
-
-    readRawBits(24);
-
-    /* Read header. */
-
-    const auto& bytes = decode(readRawBits(6*10));
-
-    _sector->logicalSector = bytes[2];
-    _sector->logicalSide = 0;
-    _sector->logicalTrack = bytes[0];
-
-    uint16_t wantChecksum = bytes.reader().seek(4).read_be16();
-    uint16_t gotChecksum = crc16(CCITT_POLY, 0xef21, bytes.slice(0, 4));
-    if (wantChecksum == gotChecksum)
-        _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
-}
-
-void DurangoF85Decoder::decodeDataRecord()
-{
-    /* Skip sync bits ID byte. */
-
-    readRawBits(24);
-
-    const auto& bytes = decode(readRawBits((F85_SECTOR_LENGTH+3)*10))
-        .slice(0, F85_SECTOR_LENGTH+3);
-    ByteReader br(bytes);
-
-    _sector->data = br.read(F85_SECTOR_LENGTH);
-    uint16_t wantChecksum = br.read_be16();
-    uint16_t gotChecksum = crc16(CCITT_POLY, 0xbf84, _sector->data);
-    _sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/f85/f85.h
+++ b/arch/f85/f85.h
@@ -5,17 +5,6 @@
 #define F85_DATA_RECORD 0xffffcb /* 1111 1111 1111 1111 1100 1101 */
 #define F85_SECTOR_LENGTH    512

-class Sector;
-class Fluxmap;
-
-class DurangoF85Decoder : public AbstractDecoder
-{
-public:
-    virtual ~DurangoF85Decoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createDurangoF85Decoder(const DecoderProto& config);

 #endif
--- a/arch/f85/f85.proto
+++ b/arch/f85/f85.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message F85DecoderProto {}
+
--- a/arch/fb100/decoder.cc
+++ b/arch/fb100/decoder.cc
@@ -2,14 +2,12 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "fb100.h"
 #include "crc.h"
 #include "bytes.h"
 #include "decoders/rawbits.h"
-#include "track.h"
 #include "fmt/format.h"
 #include <string.h>
 #include <algorithm>
@@ -99,37 +97,52 @@ static uint16_t checksum(const Bytes& bytes)
    return (crchi << 8) | crclo;
 }

-AbstractDecoder::RecordType Fb100Decoder::advanceToNextRecord()
+class Fb100Decoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(SECTOR_ID_PATTERN, matcher);
-    if (matcher == &SECTOR_ID_PATTERN)
-		return RecordType::SECTOR_RECORD;
-	return RecordType::UNKNOWN_RECORD;
+public:
+	Fb100Decoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(SECTOR_ID_PATTERN, matcher);
+		if (matcher == &SECTOR_ID_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		auto rawbits = readRawBits(FB100_RECORD_SIZE*16);
+
+		const Bytes bytes = decodeFmMfm(rawbits).slice(0, FB100_RECORD_SIZE);
+		ByteReader br(bytes);
+		br.seek(1);
+		const Bytes id = br.read(FB100_ID_SIZE);
+		uint16_t wantIdCrc = br.read_be16();
+		uint16_t gotIdCrc = checksum(id);
+		const Bytes payload = br.read(FB100_PAYLOAD_SIZE);
+		uint16_t wantPayloadCrc = br.read_be16();
+		uint16_t gotPayloadCrc = checksum(payload);
+
+		if (wantIdCrc != gotIdCrc)
+			return;
+
+		uint8_t abssector = id[2];
+		_sector->logicalTrack = abssector >> 1;
+		_sector->logicalSide = 0;
+		_sector->logicalSector = abssector & 1;
+		_sector->data.writer().append(id.slice(5, 12)).append(payload);
+
+		_sector->status = (wantPayloadCrc == gotPayloadCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createFb100Decoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new Fb100Decoder(config));
 }

-void Fb100Decoder::decodeSectorRecord()
-{
-    auto rawbits = readRawBits(FB100_RECORD_SIZE*16);

-    const Bytes bytes = decodeFmMfm(rawbits).slice(0, FB100_RECORD_SIZE);
-    ByteReader br(bytes);
-    br.seek(1);
-    const Bytes id = br.read(FB100_ID_SIZE);
-    uint16_t wantIdCrc = br.read_be16();
-    uint16_t gotIdCrc = checksum(id);
-    const Bytes payload = br.read(FB100_PAYLOAD_SIZE);
-    uint16_t wantPayloadCrc = br.read_be16();
-    uint16_t gotPayloadCrc = checksum(payload);
-
-    if (wantIdCrc != gotIdCrc)
-        return;
-
-    uint8_t abssector = id[2];
-    _sector->logicalTrack = abssector >> 1;
-    _sector->logicalSide = 0;
-    _sector->logicalSector = abssector & 1;
-    _sector->data.writer().append(id.slice(5, 12)).append(payload);
-
-    _sector->status = (wantPayloadCrc == gotPayloadCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/fb100/fb100.h
+++ b/arch/fb100/fb100.h
@@ -5,18 +5,7 @@
 #define FB100_ID_SIZE 17
 #define FB100_PAYLOAD_SIZE 0x500

-class Sector;
-class Fluxmap;
-class Track;
-
-class Fb100Decoder : public AbstractDecoder
-{
-public:
-    virtual ~Fb100Decoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createFb100Decoder(const DecoderProto& config);

 #endif

--- a/arch/fb100/fb100.proto
+++ b/arch/fb100/fb100.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message Fb100DecoderProto {}
+
--- a/arch/ibm/decoder.cc
+++ b/arch/ibm/decoder.cc
@@ -5,7 +5,8 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "sector.h"
-#include "record.h"
+#include "arch/ibm/ibm.pb.h"
+#include "proto.h"
 #include <string.h>

 static_assert(std::is_trivially_copyable<IbmIdam>::value,
@@ -57,11 +58,11 @@ const FluxPattern FM_TRS80DAM1_PATTERN(16, 0xf56b);

 /* 
 * TRS80DAM2 record:
- * flux:   XXXX-X-X-XX-XXX- = 0xf56c
+ * flux:   XXXX-X-X-XX-XXX- = 0xf56e
 * clock:  X X - - - X X X  = 0xc7
 * data:    X X X X X - X - = 0xfa
 */
-const FluxPattern FM_TRS80DAM2_PATTERN(16, 0xf56c);
+const FluxPattern FM_TRS80DAM2_PATTERN(16, 0xf56e);

 /* MFM record separator:
 * 0xA1 is:
@@ -89,71 +90,104 @@ const FluxMatchers ANY_RECORD_PATTERN(
    }
 );

-AbstractDecoder::RecordType IbmDecoder::advanceToNextRecord()
+class IbmDecoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+public:
+    IbmDecoder(const DecoderProto& config):
+		AbstractDecoder(config),
+		_config(config.ibm())
+    {}

-    /* If this is the MFM prefix byte, the the decoder is going to expect three
-     * extra bytes on the front of the header. */
-    _currentHeaderLength = (matcher == &MFM_PATTERN) ? 3 : 0;
+    RecordType advanceToNextRecord() override
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);

-    Fluxmap::Position here = tell();
-    if (_currentHeaderLength > 0)
-        readRawBits(_currentHeaderLength*16);
-    auto idbits = readRawBits(16);
-    const Bytes idbytes = decodeFmMfm(idbits);
-    uint8_t id = idbytes.slice(0, 1)[0];
-    seek(here);
-    
-    switch (id)
-    {
-        case IBM_IDAM:
-            return RecordType::SECTOR_RECORD;
+		/* If this is the MFM prefix byte, the the decoder is going to expect three
+		 * extra bytes on the front of the header. */
+		_currentHeaderLength = (matcher == &MFM_PATTERN) ? 3 : 0;

-        case IBM_DAM1:
-        case IBM_DAM2:
-        case IBM_TRS80DAM1:
-        case IBM_TRS80DAM2:
-            return RecordType::DATA_RECORD;
-    }
-    return RecordType::UNKNOWN_RECORD;
+		Fluxmap::Position here = tell();
+		resetFluxDecoder();
+		if (_currentHeaderLength > 0)
+			readRawBits(_currentHeaderLength*16);
+		auto idbits = readRawBits(16);
+		const Bytes idbytes = decodeFmMfm(idbits);
+		uint8_t id = idbytes.slice(0, 1)[0];
+		seek(here);
+		
+		switch (id)
+		{
+			case IBM_IDAM:
+				return RecordType::SECTOR_RECORD;
+
+			case IBM_DAM1:
+			case IBM_DAM2:
+			case IBM_TRS80DAM1:
+			case IBM_TRS80DAM2:
+				return RecordType::DATA_RECORD;
+		}
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord() override
+	{
+		unsigned recordSize = _currentHeaderLength + IBM_IDAM_LEN;
+		auto bits = readRawBits(recordSize*16);
+		auto bytes = decodeFmMfm(bits).slice(0, recordSize);
+
+		ByteReader br(bytes);
+		br.seek(_currentHeaderLength);
+		br.read_8(); /* skip ID byte */
+		_sector->logicalTrack = br.read_8();
+		_sector->logicalSide = br.read_8();
+		_sector->logicalSector = br.read_8();
+		_currentSectorSize = 1 << (br.read_8() + 7);
+		uint16_t wantCrc = br.read_be16();
+		uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, _currentHeaderLength + 5));
+		if (wantCrc == gotCrc)
+			_sector->status = Sector::DATA_MISSING; /* correct but unintuitive */
+
+		if (_config.swap_sides())
+			_sector->logicalSide ^= 1;
+		if (_config.ignore_side_byte())
+			_sector->logicalSide = _sector->physicalHead;
+		if (_config.ignore_track_byte())
+			_sector->logicalTrack = _sector->physicalCylinder;
+	}
+
+    void decodeDataRecord() override
+	{
+		unsigned recordLength = _currentHeaderLength + _currentSectorSize + 3;
+		auto bits = readRawBits(recordLength*16);
+		auto bytes = decodeFmMfm(bits).slice(0, recordLength);
+
+		ByteReader br(bytes);
+		br.seek(_currentHeaderLength);
+		br.read_8(); /* skip ID byte */
+
+		_sector->data = br.read(_currentSectorSize);
+		uint16_t wantCrc = br.read_be16();
+		uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, recordLength-2));
+		_sector->status = (wantCrc == gotCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+
+	std::set<unsigned> requiredSectors(unsigned cylinder, unsigned head) const override
+	{
+		std::set<unsigned> s;
+		for (int sectorId : _config.sectors().sector())
+			s.insert(sectorId);
+		return s;
+	}
+
+private:
+	const IbmDecoderProto& _config;
+    unsigned _currentSectorSize;
+    unsigned _currentHeaderLength;
+};
+
+std::unique_ptr<AbstractDecoder> createIbmDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new IbmDecoder(config));
 }

-void IbmDecoder::decodeSectorRecord()
-{
-    unsigned recordSize = _currentHeaderLength + IBM_IDAM_LEN;
-    auto bits = readRawBits(recordSize*16);
-    auto bytes = decodeFmMfm(bits).slice(0, recordSize);
-
-    ByteReader br(bytes);
-    br.seek(_currentHeaderLength);
-    br.read_8(); /* skip ID byte */
-    _sector->logicalTrack = br.read_8();
-    _sector->logicalSide = br.read_8();
-    _sector->logicalSector = br.read_8() - _sectorBase;
-    _currentSectorSize = 1 << (br.read_8() + 7);
-    uint16_t wantCrc = br.read_be16();
-    uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, _currentHeaderLength + 5));
-    if (wantCrc == gotCrc)
-        _sector->status = Sector::DATA_MISSING; /* correct but unintuitive */
-
-    if (_ignoreSideByte)
-        _sector->logicalSide = _sector->physicalSide;
-}
-
-void IbmDecoder::decodeDataRecord()
-{
-    unsigned recordLength = _currentHeaderLength + _currentSectorSize + 3;
-    auto bits = readRawBits(recordLength*16);
-    auto bytes = decodeFmMfm(bits).slice(0, recordLength);
-
-    ByteReader br(bytes);
-    br.seek(_currentHeaderLength);
-    br.read_8(); /* skip ID byte */
-
-    _sector->data = br.read(_currentSectorSize);
-    uint16_t wantCrc = br.read_be16();
-    uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, recordLength-2));
-    _sector->status = (wantCrc == gotCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/ibm/encoder.cc
+++ b/arch/ibm/encoder.cc
@@ -0,0 +1,286 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "ibm.h"
+#include "crc.h"
+#include "writer.h"
+#include "image.h"
+#include "arch/ibm/ibm.pb.h"
+#include "lib/encoders/encoders.pb.h"
+#include "fmt/format.h"
+#include <ctype.h>
+
+/* IAM record separator:
+ * 0xC2 is:
+ * data:    1  1  0  0  0  0  1  0  = 0xc2
+ * mfm:     01 01 00 10 10 10 01 00 = 0x5254
+ * special: 01 01 00 10 00 10 01 00 = 0x5224
+ */
+#define MFM_IAM_SEPARATOR 0x5224
+
+/* FM IAM record:
+ * flux:   XXXX-XXX-XXXX-X- = 0xf77a
+ * clock:  X X - X - X X X  = 0xd7
+ * data:    X X X X X X - - = 0xfc
+ */
+#define FM_IAM_RECORD 0xf77a
+
+/* MFM IAM record:
+ * data:   1  1  1  1  1  1  0  0  = 0xfc
+ * flux:   01 01 01 01 01 01 00 10 = 0x5552
+ */
+#define MFM_IAM_RECORD 0x5552
+
+/* MFM record separator:
+ * 0xA1 is:
+ * data:    1  0  1  0  0  0  0  1  = 0xa1
+ * mfm:     01 00 01 00 10 10 10 01 = 0x44a9
+ * special: 01 00 01 00 10 00 10 01 = 0x4489
+ *                       ^^^^^
+ * When shifted out of phase, the special 0xa1 byte becomes an illegal
+ * encoding (you can't do 10 00). So this can't be spoofed by user data.
+ * 
+ * shifted: 10 00 10 01 00 01 00 1
+ * 
+ * It's repeated three times.
+ */
+#define MFM_RECORD_SEPARATOR 0x4489
+#define MFM_RECORD_SEPARATOR_BYTE 0xa1
+
+/* MFM IDAM byte:
+ * data:    1  1  1  1  1  1  1  0  = 0xfe
+ * mfm:     01 01 01 01 01 01 01 00 = 0x5554
+ */
+
+/* MFM DAM byte:
+ * data:    1  1  1  1  1  0  1  1  = 0xfb
+ * mfm:     01 01 01 01 01 00 01 01 = 0x5545
+ */
+
+static uint8_t decodeUint16(uint16_t raw)
+{
+	Bytes b;
+	ByteWriter bw(b);
+	bw.write_be16(raw);
+	return decodeFmMfm(b.toBits())[0];
+}
+
+class IbmEncoder : public AbstractEncoder
+{
+public:
+	IbmEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.ibm())
+	{}
+
+private:
+	void writeRawBits(uint32_t data, int width)
+	{
+		_cursor += width;
+		_lastBit = data & 1;
+		for (int i=0; i<width; i++)
+		{
+			unsigned pos = _cursor - i - 1;
+			if (pos < _bits.size())
+				_bits[pos] = data & 1;
+			data >>= 1;
+		}
+	}
+
+	void getTrackFormat(IbmEncoderProto::TrackdataProto& trackdata, unsigned cylinder, unsigned head)
+	{
+		trackdata.Clear();
+		for (const auto& f : _config.trackdata())
+		{
+			if (f.has_cylinder() && (f.cylinder() != cylinder))
+				continue;
+			if (f.has_head() && (f.head() != head))
+				continue;
+
+			trackdata.MergeFrom(f);
+		}
+	}
+
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+		IbmEncoderProto::TrackdataProto trackdata;
+		getTrackFormat(trackdata, physicalTrack, physicalSide);
+
+		int logicalSide = physicalSide ^ trackdata.swap_sides();
+		for (int sectorId : trackdata.sectors().sector())
+        {
+			const auto& sector = image.get(physicalTrack, logicalSide, sectorId);
+			if (sector)
+				sectors.push_back(sector);
+        }
+
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		IbmEncoderProto::TrackdataProto trackdata;
+		getTrackFormat(trackdata, physicalTrack, physicalSide);
+
+		auto writeBytes = [&](const Bytes& bytes)
+		{
+			if (trackdata.use_fm())
+				encodeFm(_bits, _cursor, bytes);
+			else
+				encodeMfm(_bits, _cursor, bytes, _lastBit);
+		};
+
+		auto writeFillerBytes = [&](int count, uint8_t byte)
+		{
+			Bytes bytes = { byte };
+			for (int i=0; i<count; i++)
+				writeBytes(bytes);
+		};
+
+		double clockRateUs = 1e3 / trackdata.clock_rate_khz();
+		if (!trackdata.use_fm())
+			clockRateUs /= 2.0;
+		int bitsPerRevolution = (trackdata.track_length_ms() * 1000.0) / clockRateUs;
+		_bits.resize(bitsPerRevolution);
+		_cursor = 0;
+
+		uint8_t idamUnencoded = decodeUint16(trackdata.idam_byte());
+		uint8_t damUnencoded = decodeUint16(trackdata.dam_byte());
+
+		uint8_t sectorSize = 0;
+		{
+			int s = trackdata.sector_size() >> 7;
+			while (s > 1)
+			{
+				s >>= 1;
+				sectorSize += 1;
+			}
+		}
+
+		uint8_t gapFill = trackdata.use_fm() ? 0x00 : 0x4e;
+
+		writeFillerBytes(trackdata.gap0(), gapFill);
+		if (trackdata.emit_iam())
+		{
+			writeFillerBytes(trackdata.use_fm() ? 6 : 12, 0x00);
+			if (!trackdata.use_fm())
+			{
+				for (int i=0; i<3; i++)
+					writeRawBits(MFM_IAM_SEPARATOR, 16);
+			}
+			writeRawBits(trackdata.use_fm() ? FM_IAM_RECORD : MFM_IAM_RECORD, 16);
+			writeFillerBytes(trackdata.gap1(), gapFill);
+		}
+
+		int logicalSide = physicalSide ^ trackdata.swap_sides();
+		bool first = true;
+		for (int sectorId : trackdata.sectors().sector())
+		{
+			if (!first)
+				writeFillerBytes(trackdata.gap3(), gapFill);
+			first = false;
+
+			const auto& sectorData = image.get(physicalTrack, logicalSide, sectorId);
+			if (!sectorData)
+				continue;
+
+			/* Writing the sector and data records are fantastically annoying.
+			 * The CRC is calculated from the *very start* of the record, and
+			 * include the malformed marker bytes. Our encoder doesn't know
+			 * about this, of course, with the result that we have to construct
+			 * the unencoded header, calculate the checksum, and then use the
+			 * same logic to emit the bytes which require special encoding
+			 * before encoding the rest of the header normally. */
+
+			{
+				Bytes header;
+				ByteWriter bw(header);
+
+				writeFillerBytes(trackdata.use_fm() ? 6 : 12, 0x00);
+				if (!trackdata.use_fm())
+				{
+					for (int i=0; i<3; i++)
+						bw.write_8(MFM_RECORD_SEPARATOR_BYTE);
+				}
+				bw.write_8(idamUnencoded);
+				bw.write_8(sectorData->logicalTrack);
+				bw.write_8(sectorData->logicalSide);
+				bw.write_8(sectorData->logicalSector);
+				bw.write_8(sectorSize);
+				uint16_t crc = crc16(CCITT_POLY, header);
+				bw.write_be16(crc);
+
+				int conventionalHeaderStart = 0;
+				if (!trackdata.use_fm())
+				{
+					for (int i=0; i<3; i++)
+						writeRawBits(MFM_RECORD_SEPARATOR, 16);
+					conventionalHeaderStart += 3;
+
+				}
+				writeRawBits(trackdata.idam_byte(), 16);
+				conventionalHeaderStart += 1;
+
+				writeBytes(header.slice(conventionalHeaderStart));
+			}
+
+			writeFillerBytes(trackdata.gap2(), gapFill);
+
+			{
+				Bytes data;
+				ByteWriter bw(data);
+
+				writeFillerBytes(trackdata.use_fm() ? 6 : 12, 0x00);
+				if (!trackdata.use_fm())
+				{
+					for (int i=0; i<3; i++)
+						bw.write_8(MFM_RECORD_SEPARATOR_BYTE);
+				}
+				bw.write_8(damUnencoded);
+
+				Bytes truncatedData = sectorData->data.slice(0, trackdata.sector_size());
+				bw += truncatedData;
+				uint16_t crc = crc16(CCITT_POLY, data);
+				bw.write_be16(crc);
+
+				int conventionalHeaderStart = 0;
+				if (!trackdata.use_fm())
+				{
+					for (int i=0; i<3; i++)
+						writeRawBits(MFM_RECORD_SEPARATOR, 16);
+					conventionalHeaderStart += 3;
+
+				}
+				writeRawBits(trackdata.dam_byte(), 16);
+				conventionalHeaderStart += 1;
+
+				writeBytes(data.slice(conventionalHeaderStart));
+			}
+		}
+
+		if (_cursor >= _bits.size())
+			Error() << "track data overrun";
+		while (_cursor < _bits.size())
+			writeFillerBytes(1, gapFill);
+
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(_bits, clockRateUs*1e3);
+		return fluxmap;
+	}
+
+private:
+	const IbmEncoderProto& _config;
+	std::vector<bool> _bits;
+	unsigned _cursor;
+	bool _lastBit;
+};
+
+std::unique_ptr<AbstractEncoder> createIbmEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new IbmEncoder(config));
+}
+
+
--- a/arch/ibm/ibm.h
+++ b/arch/ibm/ibm.h
@@ -1,8 +1,6 @@
 #ifndef IBM_H
 #define IBM_H

-#include "decoders/decoders.h"
-
 /* IBM format (i.e. ordinary PC floppies). */

 #define IBM_MFM_SYNC   0xA1   /* sync byte for MFM */
@@ -28,71 +26,12 @@ struct IbmIdam
    uint8_t crc[2];
 };

-class IbmDecoder : public AbstractDecoder
-{
-public:
-    IbmDecoder(unsigned sectorBase, bool ignoreSideByte=false):
-        _sectorBase(sectorBase),
-        _ignoreSideByte(ignoreSideByte)
-    {}
+class AbstractEncoder;
+class AbstractDecoder;
+class DecoderProto;
+class EncoderProto;

-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-
-private:
-    unsigned _sectorBase;
-    bool _ignoreSideByte;
-    unsigned _currentSectorSize;
-    unsigned _currentHeaderLength;
-};
-
-#if 0
-class AbstractIbmDecoder : public AbstractSoftSectorDecoder
-{
-public:
-    AbstractIbmDecoder(unsigned sectorIdBase):
-        _sectorIdBase(sectorIdBase)
-    {}
-    virtual ~AbstractIbmDecoder() {}
-
-    SectorVector decodeToSectors(const RawRecordVector& rawRecords, unsigned physicalTrack, unsigned physicalSide);
-
-protected:
-    virtual int skipHeaderBytes() const = 0;
-
-private:
-    unsigned _sectorIdBase;
-};
-
-class IbmFmDecoder : public AbstractIbmDecoder
-{
-public:
-    IbmFmDecoder(unsigned sectorIdBase):
-        AbstractIbmDecoder(sectorIdBase)
-    {}
-
-    int recordMatcher(uint64_t fifo) const;
-
-protected:
-    int skipHeaderBytes() const
-    { return 0; }
-};
-
-class IbmMfmDecoder : public AbstractIbmDecoder
-{
-public:
-    IbmMfmDecoder(unsigned sectorIdBase):
-        AbstractIbmDecoder(sectorIdBase)
-    {}
-
-    nanoseconds_t guessClock(Fluxmap& fluxmap) const;
-    int recordMatcher(uint64_t fifo) const;
-
-protected:
-    int skipHeaderBytes() const
-    { return 3; }
-};
-#endif
+extern std::unique_ptr<AbstractDecoder> createIbmDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createIbmEncoder(const EncoderProto& config);

 #endif
--- a/arch/ibm/ibm.proto
+++ b/arch/ibm/ibm.proto
@@ -0,0 +1,44 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+// Next: 7
+message IbmDecoderProto {
+	message SectorsProto {
+		repeated int32 sector = 1            [(help) = "require these sectors to exist for a good read"];
+	}
+
+	optional bool ignore_side_byte = 2       [default = false, (help) = "ignore side byte in sector header"];
+	optional bool ignore_track_byte = 6      [default = false, (help) = "ignore track byte in sector header"];
+	optional bool swap_sides = 4             [default = false, (help) = "put logical side 1 on physical side 0"];
+	optional SectorsProto sectors = 5        [(help) = "require these sectors to exist for a good read"];
+}
+
+message IbmEncoderProto {
+	// Next: 18
+	message TrackdataProto {
+		message SectorsProto {
+			repeated int32 sector = 1		[(help) = "write these sectors (in order) on each track"];
+		}
+
+		optional int32 cylinder = 15        [(help) = "if set, the format applies only to this track"];
+		optional int32 head = 16            [(help) = "if set, the format applies only to this head"];
+
+		optional double track_length_ms = 1 [(help) = "length of track"];
+		optional int32 sector_size = 2      [default=512, (help) = "number of bytes per sector"];
+		optional bool emit_iam = 3          [default=true, (help) = "whether to emit an IAM record"];
+		optional double clock_rate_khz = 5  [(help) = "data clock rate"];
+		optional bool use_fm = 6            [default=false, (help) = "whether to use FM encoding rather than MFM"];
+		optional int32 idam_byte = 7        [default=0x5554, (help) = "16-bit raw bit pattern of IDAM byte"];
+		optional int32 dam_byte = 8         [default=0x5545, (help) = "16-bit raw bit pattern of DAM byte"];
+		optional int32 gap0 = 9             [default=80, (help) = "size of gap 1 (the post-index gap)"];
+		optional int32 gap1 = 10            [default=50, (help) = "size of gap 2 (the post-ID gap)"];
+		optional int32 gap2 = 11            [default=22, (help) = "size of gap 3 (the pre-data gap)"];
+		optional int32 gap3 = 12            [default=80, (help) = "size of gap 4 (the post-data or format gap)"];
+		optional bool swap_sides = 14       [default=false, (help) = "swap side bytes when writing"];
+		optional SectorsProto sectors = 17	[(help) = "write these sectors (in order) on each track"];
+	}
+
+	repeated TrackdataProto trackdata = 1;
+}
+
--- a/arch/macintosh/decoder.cc
+++ b/arch/macintosh/decoder.cc
@@ -2,10 +2,8 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
-#include "track.h"
 #include "macintosh.h"
 #include "bytes.h"
 #include "fmt/format.h"
@@ -26,7 +24,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 /* This is extremely inspired by the MESS implementation, written by Nathan Woods
 * and R. Belmont: https://github.com/mamedev/mame/blob/4263a71e64377db11392c458b580c5ae83556bc7/src/lib/formats/ap_dsk35.cpp
@@ -118,69 +116,103 @@ static Bytes decode_crazy_data(const Bytes& input, Sector::Status& status)
 uint8_t decode_side(uint8_t side)
 {
    /* Mac disks, being weird, use the side byte to encode both the side (in
-     * bit 5) and also whether we're above track 0x3f (in bit 6).
+     * bit 5) and also whether we're above track 0x3f (in bit 0).
     */

-    return !!(side & 0x40);
+    return !!(side & 0x20);
 }

-AbstractDecoder::RecordType MacintoshDecoder::advanceToNextRecord()
+class MacintoshDecoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return DATA_RECORD;
-	return UNKNOWN_RECORD;
-}
+public:
+	MacintoshDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}

-void MacintoshDecoder::decodeSectorRecord()
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return DATA_RECORD;
+		return UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		/* Skip ID (as we know it's a MAC_SECTOR_RECORD). */
+		readRawBits(24);
+
+		/* Read header. */
+
+		auto header = toBytes(readRawBits(7*8)).slice(0, 7);
+					
+		uint8_t encodedTrack = decode_data_gcr(header[0]);
+		if (encodedTrack != (_sector->physicalCylinder & 0x3f))
+			return;
+					
+		uint8_t encodedSector = decode_data_gcr(header[1]);
+		uint8_t encodedSide = decode_data_gcr(header[2]);
+		uint8_t formatByte = decode_data_gcr(header[3]);
+		uint8_t wantedsum = decode_data_gcr(header[4]);
+
+		if (encodedSector > 11)
+			return;
+
+		_sector->logicalTrack = _sector->physicalCylinder;
+		_sector->logicalSide = decode_side(encodedSide);
+		_sector->logicalSector = encodedSector;
+		uint8_t gotsum = (encodedTrack ^ encodedSector ^ encodedSide ^ formatByte) & 0x3f;
+		if (wantedsum == gotsum)
+			_sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	}
+
+    void decodeDataRecord()
+	{
+		auto id = toBytes(readRawBits(24)).reader().read_be24();
+		if (id != MAC_DATA_RECORD)
+			return;
+
+		/* Read data. */
+
+		readRawBits(8); /* skip spare byte */
+		auto inputbuffer = toBytes(readRawBits(MAC_ENCODED_SECTOR_LENGTH*8))
+			.slice(0, MAC_ENCODED_SECTOR_LENGTH);
+
+		for (unsigned i=0; i<inputbuffer.size(); i++)
+			inputbuffer[i] = decode_data_gcr(inputbuffer[i]);
+			
+		_sector->status = Sector::BAD_CHECKSUM;
+		Bytes userData = decode_crazy_data(inputbuffer, _sector->status);
+		_sector->data.clear();
+		_sector->data.writer().append(userData.slice(12, 512)).append(userData.slice(0, 12));
+	}
+
+	std::set<unsigned> requiredSectors(unsigned cylinder, unsigned head) const
+	{
+		int count;
+		if (cylinder < 16)
+			count = 12;
+		else if (cylinder < 32)
+			count = 11;
+		else if (cylinder < 48)
+			count = 10;
+		else if (cylinder < 64)
+			count = 9;
+		else
+			count = 8;
+
+		std::set<unsigned> sectors;
+		while (count--)
+			sectors.insert(count);
+		return sectors;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createMacintoshDecoder(const DecoderProto& config)
 {
-    /* Skip ID (as we know it's a MAC_SECTOR_RECORD). */
-    readRawBits(24);
-
-    /* Read header. */
-
-    auto header = toBytes(readRawBits(7*8)).slice(0, 7);
-                
-    uint8_t encodedTrack = decode_data_gcr(header[0]);
-    if (encodedTrack != (_track->physicalTrack & 0x3f))
-        return;
-                
-    uint8_t encodedSector = decode_data_gcr(header[1]);
-    uint8_t encodedSide = decode_data_gcr(header[2]);
-    uint8_t formatByte = decode_data_gcr(header[3]);
-    uint8_t wantedsum = decode_data_gcr(header[4]);
-
-    if (encodedSector > 11)
-        return;
-
-    _sector->logicalTrack = _track->physicalTrack;
-    _sector->logicalSide = decode_side(encodedSide);
-    _sector->logicalSector = encodedSector;
-    uint8_t gotsum = (encodedTrack ^ encodedSector ^ encodedSide ^ formatByte) & 0x3f;
-    if (wantedsum == gotsum)
-        _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	return std::unique_ptr<AbstractDecoder>(new MacintoshDecoder(config));
 }

-void MacintoshDecoder::decodeDataRecord()
-{
-    auto id = toBytes(readRawBits(24)).reader().read_be24();
-    if (id != MAC_DATA_RECORD)
-        return;
-
-    /* Read data. */
-
-    readRawBits(8); /* skip spare byte */
-    auto inputbuffer = toBytes(readRawBits(MAC_ENCODED_SECTOR_LENGTH*8))
-        .slice(0, MAC_ENCODED_SECTOR_LENGTH);
-
-    for (unsigned i=0; i<inputbuffer.size(); i++)
-        inputbuffer[i] = decode_data_gcr(inputbuffer[i]);
-        
-    _sector->status = Sector::BAD_CHECKSUM;
-    Bytes userData = decode_crazy_data(inputbuffer, _sector->status);
-    _sector->data.clear();
-    _sector->data.writer().append(userData.slice(12, 512)).append(userData.slice(0, 12));
-}
--- a/arch/macintosh/encoder.cc
+++ b/arch/macintosh/encoder.cc
@@ -0,0 +1,263 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "macintosh.h"
+#include "crc.h"
+#include "writer.h"
+#include "image.h"
+#include "fmt/format.h"
+#include "lib/encoders/encoders.pb.h"
+#include "arch/macintosh/macintosh.pb.h"
+#include <ctype.h>
+
+static bool lastBit;
+
+static double clockRateUsForTrack(unsigned track)
+{
+	if (track < 16)
+		return 2.623;
+	if (track < 32)
+		return 2.861;
+	if (track < 48)
+		return 3.148;
+	if (track < 64)
+		return 3.497;
+	return 3.934;
+}
+
+static unsigned sectorsForTrack(unsigned track)
+{
+	if (track < 16)
+		return 12;
+	if (track < 32)
+		return 11;
+	if (track < 48)
+		return 10;
+	if (track < 64)
+		return 9;
+	return 8;
+}
+
+static int encode_data_gcr(uint8_t gcr)
+{
+    switch (gcr)
+    {
+		#define GCR_ENTRY(gcr, data) \
+			case data: return gcr;
+		#include "data_gcr.h"
+		#undef GCR_ENTRY
+    }
+    return -1;
+}
+
+/* This is extremely inspired by the MESS implementation, written by Nathan Woods
+ * and R. Belmont: https://github.com/mamedev/mame/blob/4263a71e64377db11392c458b580c5ae83556bc7/src/lib/formats/ap_dsk35.cpp
+ */
+static Bytes encode_crazy_data(const Bytes& input)
+{
+    Bytes output;
+    ByteWriter bw(output);
+    ByteReader br(input);
+
+	uint8_t w1, w2, w3, w4;
+
+    static const int LOOKUP_LEN = MAC_SECTOR_LENGTH / 3;
+
+    uint8_t b1[LOOKUP_LEN + 1];
+    uint8_t b2[LOOKUP_LEN + 1];
+    uint8_t b3[LOOKUP_LEN + 1];
+
+	uint32_t c1 = 0;
+	uint32_t c2 = 0;
+	uint32_t c3 = 0;
+	for (int j=0;; j++)
+	{
+		c1 = (c1 & 0xff) << 1;
+		if (c1 & 0x0100)
+			c1++;
+
+		uint8_t val = br.read_8();
+		c3 += val;
+		if (c1 & 0x0100)
+		{
+			c3++;
+			c1 &= 0xff;
+		}
+		b1[j] = (val ^ c1) & 0xff;
+
+		val = br.read_8();
+		c2 += val;
+		if (c3 > 0xff)
+		{
+			c2++;
+			c3 &= 0xff;
+		}
+		b2[j] = (val ^ c3) & 0xff;
+
+		if (br.pos == 524)
+			break;
+
+		val = br.read_8();
+		c1 += val;
+		if (c2 > 0xff)
+		{
+			c1++;
+			c2 &= 0xff;
+		}
+		b3[j] = (val ^ c2) & 0xff;
+	}
+	uint32_t c4 = ((c1 & 0xc0) >> 6) | ((c2 & 0xc0) >> 4) | ((c3 & 0xc0) >> 2);
+	b3[LOOKUP_LEN] = 0;
+
+	for (int i = 0; i <= LOOKUP_LEN; i++)
+	{
+		w1 = b1[i] & 0x3f;
+		w2 = b2[i] & 0x3f;
+		w3 = b3[i] & 0x3f;
+		w4 =  ((b1[i] & 0xc0) >> 2);
+		w4 |= ((b2[i] & 0xc0) >> 4);
+		w4 |= ((b3[i] & 0xc0) >> 6);
+
+		bw.write_8(w4);
+		bw.write_8(w1);
+		bw.write_8(w2);
+
+		if (i != LOOKUP_LEN)
+			bw.write_8(w3);
+	}
+
+	bw.write_8(c4 & 0x3f);
+	bw.write_8(c3 & 0x3f);
+	bw.write_8(c2 & 0x3f);
+	bw.write_8(c1 & 0x3f);
+
+	return output;
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, const std::vector<bool>& src)
+{
+	for (bool bit : src)
+	{
+		if (cursor < bits.size())
+			bits[cursor++] = bit;
+	}
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
+{
+	cursor += width;
+	for (int i=0; i<width; i++)
+	{
+		unsigned pos = cursor - i - 1;
+		if (pos < bits.size())
+			bits[pos] = data & 1;
+		data >>= 1;
+	}
+}
+
+static uint8_t encode_side(uint8_t track, uint8_t side)
+{
+    /* Mac disks, being weird, use the side byte to encode both the side (in
+     * bit 5) and also whether we're above track 0x3f (in bit 0).
+     */
+
+	return (side ? 0x20 : 0x00) | ((track>0x3f) ? 0x01 : 0x00);
+}
+
+static void write_sector(std::vector<bool>& bits, unsigned& cursor, const std::shared_ptr<Sector>& sector)
+{
+	if ((sector->data.size() != 512) && (sector->data.size() != 524))
+		Error() << "unsupported sector size --- you must pick 512 or 524";
+
+	write_bits(bits, cursor, 0xff, 1*8); /* pad byte */
+	for (int i=0; i<7; i++)
+		write_bits(bits, cursor, 0xff3fcff3fcffLL, 6*8); /* sync */
+	write_bits(bits, cursor, MAC_SECTOR_RECORD, 3*8);
+
+    uint8_t encodedTrack = sector->logicalTrack & 0x3f;
+	uint8_t encodedSector = sector->logicalSector;
+	uint8_t encodedSide = encode_side(sector->logicalTrack, sector->logicalSide);
+	uint8_t formatByte = MAC_FORMAT_BYTE;
+	uint8_t headerChecksum = (encodedTrack ^ encodedSector ^ encodedSide ^ formatByte) & 0x3f;
+
+	write_bits(bits, cursor, encode_data_gcr(encodedTrack), 1*8);
+	write_bits(bits, cursor, encode_data_gcr(encodedSector), 1*8);
+	write_bits(bits, cursor, encode_data_gcr(encodedSide), 1*8);
+	write_bits(bits, cursor, encode_data_gcr(formatByte), 1*8);
+	write_bits(bits, cursor, encode_data_gcr(headerChecksum), 1*8);
+
+	write_bits(bits, cursor, 0xdeaaff, 3*8);
+	write_bits(bits, cursor, 0xff3fcff3fcffLL, 6*8); /* sync */
+	write_bits(bits, cursor, MAC_DATA_RECORD, 3*8);
+	write_bits(bits, cursor, encode_data_gcr(sector->logicalSector), 1*8);
+
+	Bytes wireData;
+	wireData.writer().append(sector->data.slice(512, 12)).append(sector->data.slice(0, 512));
+	for (uint8_t b : encode_crazy_data(wireData))
+		write_bits(bits, cursor, encode_data_gcr(b), 1*8);
+
+	write_bits(bits, cursor, 0xdeaaff, 3*8);
+}
+
+class MacintoshEncoder : public AbstractEncoder
+{
+public:
+	MacintoshEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.macintosh())
+	{}
+
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+		if ((physicalTrack >= 0) && (physicalTrack < MAC_TRACKS_PER_DISK))
+        {
+            unsigned numSectors = sectorsForTrack(physicalTrack);
+            for (int sectorId=0; sectorId<numSectors; sectorId++)
+            {
+                const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+                if (sector)
+                    sectors.push_back(sector);
+            }
+        }
+
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		if ((physicalTrack < 0) || (physicalTrack >= MAC_TRACKS_PER_DISK))
+			return std::unique_ptr<Fluxmap>();
+
+		double clockRateUs = clockRateUsForTrack(physicalTrack) * _config.clock_compensation_factor();
+		int bitsPerRevolution = 200000.0 / clockRateUs;
+		std::vector<bool> bits(bitsPerRevolution);
+		unsigned cursor = 0;
+
+		fillBitmapTo(bits, cursor, _config.post_index_gap_us() / clockRateUs, { true, false });
+		lastBit = false;
+
+		for (const auto& sector : sectors)
+			write_sector(bits, cursor, sector);
+
+		if (cursor >= bits.size())
+			Error() << fmt::format("track data overrun by {} bits", cursor - bits.size());
+		fillBitmapTo(bits, cursor, bits.size(), { true, false });
+
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(bits, clockRateUs*1e3);
+		return fluxmap;
+	}
+
+private:
+	const MacintoshEncoderProto& _config;
+};
+
+std::unique_ptr<AbstractEncoder> createMacintoshEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new MacintoshEncoder(config));
+}
+
--- a/arch/macintosh/macintosh.h
+++ b/arch/macintosh/macintosh.h
@@ -6,19 +6,17 @@

 #define MAC_SECTOR_LENGTH   524 /* yes, really */
 #define MAC_ENCODED_SECTOR_LENGTH 703
+#define MAC_FORMAT_BYTE     0x22

-class Sector;
-class Fluxmap;
+#define MAC_TRACKS_PER_DISK 80

-class MacintoshDecoder : public AbstractDecoder
-{
-public:
-    virtual ~MacintoshDecoder() {}
+class AbstractEncoder;
+class AbstractDecoder;
+class DecoderProto;
+class EncoderProto;

-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createMacintoshDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createMacintoshEncoder(const EncoderProto& config);

 #endif

--- a/arch/macintosh/macintosh.proto
+++ b/arch/macintosh/macintosh.proto
@@ -0,0 +1,14 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+message MacintoshDecoderProto {}
+
+message MacintoshEncoderProto {
+	optional double post_index_gap_us = 1 [default = 0.0,
+		(help) = "post-index gap before first sector header (microseconds)."];
+
+	optional double clock_compensation_factor = 2 [default = 1.0,
+		(help) = "scale the output clock by this much."];
+}
+
--- a/arch/micropolis/decoder.cc
+++ b/arch/micropolis/decoder.cc
@@ -0,0 +1,75 @@
+#include "globals.h"
+#include "fluxmap.h"
+#include "decoders/fluxmapreader.h"
+#include "decoders/decoders.h"
+#include "sector.h"
+#include "micropolis.h"
+#include "bytes.h"
+#include "fmt/format.h"
+
+/* The sector has a preamble of MFM 0x00s and uses 0xFF as a sync pattern. */
+static const FluxPattern SECTOR_SYNC_PATTERN(32, 0xaaaa5555);
+
+/* Adds all bytes, with carry. */
+uint8_t micropolisChecksum(const Bytes& bytes) {
+	ByteReader br(bytes);
+	uint16_t sum = 0;
+	while (!br.eof()) {
+		if (sum > 0xFF) {
+			sum -= 0x100 - 1;
+		}
+		sum += br.read_8();
+	}
+	/* The last carry is ignored */
+	return sum & 0xFF;
+}
+
+class MicropolisDecoder : public AbstractDecoder
+{
+public:
+	MicropolisDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+	RecordType advanceToNextRecord()
+	{
+		_fmr->seekToIndexMark();
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(SECTOR_SYNC_PATTERN, matcher);
+		if (matcher == &SECTOR_SYNC_PATTERN) {
+			readRawBits(16);
+			return SECTOR_RECORD;
+		}
+		return UNKNOWN_RECORD;
+	}
+
+	void decodeSectorRecord()
+	{
+		auto rawbits = readRawBits(MICROPOLIS_ENCODED_SECTOR_SIZE*16);
+		auto bytes = decodeFmMfm(rawbits).slice(0, MICROPOLIS_ENCODED_SECTOR_SIZE);
+		ByteReader br(bytes);
+
+		br.read_8();  /* sync */
+		_sector->logicalTrack = br.read_8();
+		_sector->logicalSide = _sector->physicalHead;
+		_sector->logicalSector = br.read_8();
+		if (_sector->logicalSector > 15)
+			return;
+		if (_sector->logicalTrack > 77)
+			return;
+
+		br.read(10);  /* OS data or padding */
+		_sector->data = br.read(256);
+		uint8_t wantChecksum = br.read_8();
+		uint8_t gotChecksum = micropolisChecksum(bytes.slice(1, 2+266));
+		br.read(5);  /* 4 byte ECC and ECC-present flag */
+
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createMicropolisDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new MicropolisDecoder(config));
+}
+
--- a/arch/micropolis/encoder.cc
+++ b/arch/micropolis/encoder.cc
@@ -0,0 +1,113 @@
+#include "globals.h"
+#include "micropolis.h"
+#include "sector.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "image.h"
+#include "lib/encoders/encoders.pb.h"
+
+static void write_sector(std::vector<bool>& bits, unsigned& cursor, const std::shared_ptr<Sector>& sector)
+{
+	if ((sector->data.size() != 256) && (sector->data.size() != MICROPOLIS_ENCODED_SECTOR_SIZE))
+		Error() << "unsupported sector size --- you must pick 256 or 275";
+
+	int fullSectorSize = 40 + MICROPOLIS_ENCODED_SECTOR_SIZE + 40 + 35;
+	auto fullSector = std::make_shared<std::vector<uint8_t>>();
+	fullSector->reserve(fullSectorSize);
+	/* sector preamble */
+	for (int i=0; i<40; i++)
+		fullSector->push_back(0);
+	Bytes sectorData;
+	if (sector->data.size() == MICROPOLIS_ENCODED_SECTOR_SIZE)
+		sectorData = sector->data;
+	else
+	{
+		ByteWriter writer(sectorData);
+		writer.write_8(0xff); /* Sync */
+		writer.write_8(sector->logicalTrack);
+		writer.write_8(sector->logicalSector);
+		for (int i=0; i<10; i++)
+			writer.write_8(0); /* Padding */
+		writer += sector->data;
+		writer.write_8(micropolisChecksum(sectorData.slice(1)));
+		for (int i=0; i<5; i++)
+			writer.write_8(0); /* 4 byte ECC and ECC not present flag */
+	}
+	for (uint8_t b : sectorData)
+		fullSector->push_back(b);
+	/* sector postamble */
+	for (int i=0; i<40; i++)
+		fullSector->push_back(0);
+	/* filler */
+	for (int i=0; i<35; i++)
+		fullSector->push_back(0);
+
+	if (fullSector->size() != fullSectorSize)
+		Error() << "sector mismatched length";
+	bool lastBit = false;
+	encodeMfm(bits, cursor, fullSector, lastBit);
+	/* filler */
+	for (int i=0; i<5; i++)
+	{
+		bits[cursor++] = 1;
+		bits[cursor++] = 0;
+	}
+}
+
+class MicropolisEncoder : public AbstractEncoder
+{
+public:
+	MicropolisEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.micropolis())
+	{}
+
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+		if ((physicalTrack >= 0) && (physicalTrack < 77))
+		{
+			for (int sectorId = 0; sectorId < 16; sectorId++)
+			{
+				const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+				if (sector)
+					sectors.push_back(sector);
+			}
+		}
+
+		return sectors;
+	}
+
+	std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		int bitsPerRevolution = 100000;
+		double clockRateUs = 2.00;
+
+		if ((physicalTrack < 0) || (physicalTrack >= 77) || sectors.empty())
+			return std::unique_ptr<Fluxmap>();
+
+		std::vector<bool> bits(bitsPerRevolution);
+		unsigned cursor = 0;
+
+		for (const auto& sectorData : sectors)
+			write_sector(bits, cursor, sectorData);
+
+		if (cursor != bits.size())
+			Error() << "track data mismatched length";
+
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(bits, clockRateUs * 1e3);
+		return fluxmap;
+	}
+
+private:
+	const MicropolisEncoderProto& _config;
+};
+
+std::unique_ptr<AbstractEncoder> createMicropolisEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new MicropolisEncoder(config));
+}
+
--- a/arch/micropolis/micropolis.h
+++ b/arch/micropolis/micropolis.h
@@ -0,0 +1,16 @@
+#ifndef MICROPOLIS_H
+#define MICROPOLIS_H
+
+#define MICROPOLIS_ENCODED_SECTOR_SIZE (1+2+266+6)
+
+class AbstractDecoder;
+class AbstractEncoder;
+class EncoderProto;
+class DecoderProto;
+
+extern std::unique_ptr<AbstractDecoder> createMicropolisDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createMicropolisEncoder(const EncoderProto& config);
+
+extern uint8_t micropolisChecksum(const Bytes& bytes);
+
+#endif
--- a/arch/micropolis/micropolis.proto
+++ b/arch/micropolis/micropolis.proto
@@ -0,0 +1,5 @@
+syntax = "proto2";
+
+message MicropolisDecoderProto {}
+message MicropolisEncoderProto {}
+
--- a/arch/mx/decoder.cc
+++ b/arch/mx/decoder.cc
@@ -5,8 +5,6 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "sector.h"
-#include "record.h"
-#include "track.h"
 #include <string.h>

 const int SECTOR_SIZE = 256;
@@ -23,53 +21,73 @@ const int SECTOR_SIZE = 256;
 */
 const FluxPattern ID_PATTERN(32, 0xaaaaffaf);

-void MxDecoder::beginTrack()
+class MxDecoder : public AbstractDecoder
 {
-    _currentSector = -1;
-    _clock = 0;
+public:
+	MxDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    void beginTrack()
+	{
+		_currentSector = -1;
+		_clock = 0;
+	}
+
+    RecordType advanceToNextRecord()
+	{
+		if (_currentSector == -1)
+		{
+			/* First sector in the track: look for the sync marker. */
+			const FluxMatcher* matcher = nullptr;
+			_sector->clock = _clock = _fmr->seekToPattern(ID_PATTERN, matcher);
+			readRawBits(32); /* skip the ID mark */
+			_logicalTrack = decodeFmMfm(readRawBits(32)).slice(0, 32).reader().read_be16();
+		}
+		else if (_currentSector == 10)
+		{
+			/* That was the last sector on the disk. */
+			return UNKNOWN_RECORD;
+		}
+		else
+		{
+			/* Otherwise we assume the clock from the first sector is still valid.
+			 * The decoder framwork will automatically stop when we hit the end of
+			 * the track. */
+			_sector->clock = _clock;
+		}
+
+		_currentSector++;
+		return SECTOR_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		auto bits = readRawBits((SECTOR_SIZE+2)*16);
+		auto bytes = decodeFmMfm(bits).slice(0, SECTOR_SIZE+2).swab();
+
+		uint16_t gotChecksum = 0;
+		ByteReader br(bytes);
+		for (int i=0; i<(SECTOR_SIZE/2); i++)
+			gotChecksum += br.read_le16();
+		uint16_t wantChecksum = br.read_le16();
+
+		_sector->logicalTrack = _logicalTrack;
+		_sector->logicalSide = _sector->physicalHead;
+		_sector->logicalSector = _currentSector;
+		_sector->data = bytes.slice(0, SECTOR_SIZE);
+		_sector->status = (gotChecksum == wantChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+
+private:
+    nanoseconds_t _clock;
+    int _currentSector;
+    int _logicalTrack;
+};
+
+std::unique_ptr<AbstractDecoder> createMxDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new MxDecoder(config));
 }

-AbstractDecoder::RecordType MxDecoder::advanceToNextRecord()
-{
-    if (_currentSector == -1)
-    {
-        /* First sector in the track: look for the sync marker. */
-        const FluxMatcher* matcher = nullptr;
-        _sector->clock = _clock = _fmr->seekToPattern(ID_PATTERN, matcher);
-        readRawBits(32); /* skip the ID mark */
-        _logicalTrack = decodeFmMfm(readRawBits(32)).reader().read_be16();
-    }
-    else if (_currentSector == 10)
-    {
-        /* That was the last sector on the disk. */
-        return UNKNOWN_RECORD;
-    }
-    else
-    {
-        /* Otherwise we assume the clock from the first sector is still valid.
-         * The decoder framwork will automatically stop when we hit the end of
-         * the track. */
-        _sector->clock = _clock;
-    }

-    _currentSector++;
-    return SECTOR_RECORD;
-}
-
-void MxDecoder::decodeSectorRecord()
-{
-    auto bits = readRawBits((SECTOR_SIZE+2)*16);
-    auto bytes = decodeFmMfm(bits).slice(0, SECTOR_SIZE+2).swab();
-
-    uint16_t gotChecksum = 0;
-    ByteReader br(bytes);
-    for (int i=0; i<(SECTOR_SIZE/2); i++)
-        gotChecksum += br.read_le16();
-    uint16_t wantChecksum = br.read_le16();
-
-    _sector->logicalTrack = _logicalTrack;
-    _sector->logicalSide = _track->physicalSide;
-    _sector->logicalSector = _currentSector;
-    _sector->data = bytes.slice(0, SECTOR_SIZE);
-    _sector->status = (gotChecksum == wantChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/mx/mx.h
+++ b/arch/mx/mx.h
@@ -3,19 +3,6 @@

 #include "decoders/decoders.h"

-class MxDecoder : public AbstractDecoder
-{
-public:
-    virtual ~MxDecoder() {}
-
-    void beginTrack();
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-
-private:
-    nanoseconds_t _clock;
-    int _currentSector;
-    int _logicalTrack;
-};
+extern std::unique_ptr<AbstractDecoder> createMxDecoder(const DecoderProto& config);

 #endif
--- a/arch/mx/mx.proto
+++ b/arch/mx/mx.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message MxDecoderProto {}
+
--- a/arch/northstar/decoder.cc
+++ b/arch/northstar/decoder.cc
@@ -0,0 +1,196 @@
+/* Decoder for North Star 10-sector hard-sectored disks.
+ *
+ * Supports both single- and double-density.  For the sector format and
+ * checksum algorithm, see pp. 33 of the North Star Double Density Controller
+ * manual:
+ *
+ * http://bitsavers.org/pdf/northstar/boards/Northstar_MDS-A-D_1978.pdf
+ *
+ * North Star disks do not contain any track/head/sector information
+ * encoded in the sector record.  For this reason, we have to be absolutely
+ * sure that the hardSectorId is correct.
+ */
+
+#include "globals.h"
+#include "fluxmap.h"
+#include "decoders/fluxmapreader.h"
+#include "decoders/decoders.h"
+#include "sector.h"
+#include "northstar.h"
+#include "bytes.h"
+#include "lib/decoders/decoders.pb.h"
+#include "fmt/format.h"
+
+/*
+ * MFM sectors have 32 bytes of 00's followed by two sync characters,
+ * specified in the North Star MDS manual as 0xFBFB.
+ *
+ * This is true for most disks; however, I found a few disks, including an
+ * original North Star DOS/BASIC v2.2.1 DQ disk) that uses 0xFBnn, where
+ * nn is an incrementing pattern.
+ *
+ * 00        00        00        F         B
+ * 0000 0000 0000 0000 0000 0000 0101 0101 0100 0101
+ * A    A    A    A    A    A    5    5    4    5
+ */
+static const FluxPattern MFM_PATTERN(64, 0xAAAAAAAAAAAA5545LL);
+
+/* FM sectors have 16 bytes of 00's followed by 0xFB.
+ * 00        FB
+ * 0000 0000 1111 1111 1110 1111
+ * A    A    F    F    E    F
+ */
+static const FluxPattern FM_PATTERN(64, 0xAAAAAAAAAAAAFFEFLL);
+
+const FluxMatchers ANY_SECTOR_PATTERN(
+	{
+		&MFM_PATTERN,
+		&FM_PATTERN,
+	}
+);
+
+/* Checksum is initially 0.
+ * For each data byte, XOR with the current checksum.
+ * Rotate checksum left, carrying bit 7 to bit 0.
+ */
+uint8_t northstarChecksum(const Bytes& bytes) {
+	ByteReader br(bytes);
+	uint8_t checksum = 0;
+
+	while (!br.eof()) {
+		checksum ^= br.read_8();
+		checksum = ((checksum << 1) | ((checksum >> 7)));
+	}
+
+	return checksum;
+}
+
+class NorthstarDecoder : public AbstractDecoder
+{
+public:
+	NorthstarDecoder(const DecoderProto& config):
+		AbstractDecoder(config),
+		_config(config.northstar())
+	{}
+
+	/* Search for FM or MFM sector record */
+	RecordType advanceToNextRecord() override
+	{
+		nanoseconds_t now = _fmr->tell().ns();
+
+		/* For all but the first sector, seek to the next sector pulse.
+		 * The first sector does not contain the sector pulse in the fluxmap.
+		 */
+		if (now != 0) {
+			_fmr->seekToIndexMark();
+			now = _fmr->tell().ns();
+		}
+
+		/* Discard a possible partial sector at the end of the track.
+		 * This partial sector could be mistaken for a conflicted sector, if
+		 * whatever data read happens to match the checksum of 0, which is
+		 * rare, but has been observed on some disks.
+		 */
+		if (now > (_fmr->getDuration() - 21e6)) {
+			_fmr->seekToIndexMark();
+			return(UNKNOWN_RECORD);
+		}
+
+		int msSinceIndex = std::round(now / 1e6);
+
+		const FluxMatcher* matcher = nullptr;
+
+		/* Note that the seekToPattern ignores the sector pulses, so if
+		 * a sector is not found for some reason, the seek will advance
+		 * past one or more sector pulses.  For this reason, calculate
+		 * _hardSectorId after the sector header is found.
+		 */
+		_sector->clock = _fmr->seekToPattern(ANY_SECTOR_PATTERN, matcher);
+
+		int sectorFoundTimeRaw = std::round((_fmr->tell().ns()) / 1e6);
+		int sectorFoundTime;
+
+		/* Round time to the nearest 20ms */
+		if ((sectorFoundTimeRaw % 20) < 10) {
+			sectorFoundTime = (sectorFoundTimeRaw / 20) * 20;
+		}
+		else {
+			sectorFoundTime = ((sectorFoundTimeRaw + 20) / 20) * 20;
+		}
+
+		/* Calculate the sector ID based on time since the index */
+		_hardSectorId = (sectorFoundTime / 20) % 10;
+
+	//	std::cout << fmt::format(
+	//		"Sector ID {}: hole at {}ms, sector start at {}ms",
+	//		_hardSectorId, msSinceIndex, sectorFoundTimeRaw) << std::endl;
+
+		if (matcher == &MFM_PATTERN) {
+			_sectorType = SECTOR_TYPE_MFM;
+			readRawBits(48);
+			return SECTOR_RECORD;
+		}
+
+		if (matcher == &FM_PATTERN) {
+			_sectorType = SECTOR_TYPE_FM;
+			readRawBits(48);
+			return SECTOR_RECORD;
+		}
+
+		return UNKNOWN_RECORD;
+	}
+
+	void decodeSectorRecord() override
+	{
+		unsigned recordSize, payloadSize, headerSize;
+
+		if (_sectorType == SECTOR_TYPE_MFM) {
+			recordSize = NORTHSTAR_ENCODED_SECTOR_SIZE_DD;
+			payloadSize = NORTHSTAR_PAYLOAD_SIZE_DD;
+			headerSize = NORTHSTAR_HEADER_SIZE_DD;
+		}
+		else {
+			recordSize = NORTHSTAR_ENCODED_SECTOR_SIZE_SD;
+			payloadSize = NORTHSTAR_PAYLOAD_SIZE_SD;
+			headerSize = NORTHSTAR_HEADER_SIZE_SD;
+		}
+
+		auto rawbits = readRawBits(recordSize * 16);
+		auto bytes = decodeFmMfm(rawbits).slice(0, recordSize);
+		ByteReader br(bytes);
+		uint8_t sync_char;
+
+		_sector->logicalSide = _sector->physicalHead;
+		_sector->logicalSector = _hardSectorId;
+		_sector->logicalTrack = _sector->physicalCylinder;
+
+		sync_char = br.read_8();	/* Sync char: 0xFB */
+		if (_sectorType == SECTOR_TYPE_MFM) {
+			sync_char = br.read_8();/* MFM second Sync char, usually 0xFB */
+		}
+
+		_sector->data = br.read(payloadSize);
+
+		uint8_t wantChecksum = br.read_8();
+		uint8_t gotChecksum = northstarChecksum(bytes.slice(headerSize, payloadSize));
+
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+
+	std::set<unsigned> requiredSectors(unsigned cylinder, unsigned head) const override
+	{
+		static std::set<unsigned> sectors = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+		return sectors;
+	}
+
+private:
+	const NorthstarDecoderProto& _config;
+	uint8_t _sectorType = SECTOR_TYPE_MFM;
+	uint8_t _hardSectorId;
+};
+
+std::unique_ptr<AbstractDecoder> createNorthstarDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new NorthstarDecoder(config));
+}
+
--- a/arch/northstar/encoder.cc
+++ b/arch/northstar/encoder.cc
@@ -0,0 +1,166 @@
+#include "globals.h"
+#include "northstar.h"
+#include "sector.h"
+#include "bytes.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "image.h"
+#include "lib/encoders/encoders.pb.h"
+
+#define GAP_FILL_SIZE_SD 30
+#define PRE_HEADER_GAP_FILL_SIZE_SD 9
+#define GAP_FILL_SIZE_DD 62
+#define PRE_HEADER_GAP_FILL_SIZE_DD 16
+
+#define GAP1_FILL_BYTE	(0x4F)
+#define GAP2_FILL_BYTE	(0x4F)
+
+#define TOTAL_SECTOR_BYTES ()
+
+static void write_sector(std::vector<bool>& bits, unsigned& cursor, const std::shared_ptr<Sector>& sector)
+{
+	int preambleSize = 0;
+	int encodedSectorSize = 0;
+	int gapFillSize = 0;
+	int preHeaderGapFillSize = 0;
+
+	bool doubleDensity;
+
+	switch (sector->data.size()) {
+	case NORTHSTAR_PAYLOAD_SIZE_SD:
+		preambleSize = NORTHSTAR_PREAMBLE_SIZE_SD;
+		encodedSectorSize = PRE_HEADER_GAP_FILL_SIZE_SD + NORTHSTAR_ENCODED_SECTOR_SIZE_SD + GAP_FILL_SIZE_SD;
+		gapFillSize = GAP_FILL_SIZE_SD;
+		preHeaderGapFillSize = PRE_HEADER_GAP_FILL_SIZE_SD;
+		doubleDensity = false;
+		break;
+	case NORTHSTAR_PAYLOAD_SIZE_DD:
+		preambleSize = NORTHSTAR_PREAMBLE_SIZE_DD;
+		encodedSectorSize = PRE_HEADER_GAP_FILL_SIZE_DD + NORTHSTAR_ENCODED_SECTOR_SIZE_DD + GAP_FILL_SIZE_DD;
+		gapFillSize = GAP_FILL_SIZE_DD;
+		preHeaderGapFillSize = PRE_HEADER_GAP_FILL_SIZE_DD;
+		doubleDensity = true;
+		break;
+	default:
+		Error() << "unsupported sector size --- you must pick 256 or 512";
+		break;
+	}
+
+	int fullSectorSize = preambleSize + encodedSectorSize;
+	auto fullSector = std::make_shared<std::vector<uint8_t>>();
+	fullSector->reserve(fullSectorSize);
+
+	/* sector gap after index pulse */
+	for (int i = 0; i < preHeaderGapFillSize; i++)
+		fullSector->push_back(GAP1_FILL_BYTE);
+
+	/* sector preamble */
+	for (int i = 0; i < preambleSize; i++)
+		fullSector->push_back(0);
+
+	Bytes sectorData;
+	if (sector->data.size() == encodedSectorSize)
+		sectorData = sector->data;
+	else {
+		ByteWriter writer(sectorData);
+		writer.write_8(0xFB);     /* sync character */
+		if (doubleDensity == true) {
+			writer.write_8(0xFB); /* Double-density has two sync characters */
+		}
+		writer += sector->data;
+		if (doubleDensity == true) {
+			writer.write_8(northstarChecksum(sectorData.slice(2)));
+		} else {
+			writer.write_8(northstarChecksum(sectorData.slice(1)));
+		}
+	}
+	for (uint8_t b : sectorData)
+		fullSector->push_back(b);
+
+	if (sector->logicalSector != 9) {
+		/* sector postamble */
+		for (int i = 0; i < gapFillSize; i++)
+			fullSector->push_back(GAP2_FILL_BYTE);
+
+		if (fullSector->size() != fullSectorSize)
+			Error() << "sector mismatched length (" << sector->data.size() << ") expected: " << fullSector->size() << " got " << fullSectorSize;
+	} else {
+		/* sector postamble */
+		for (int i = 0; i < gapFillSize; i++)
+			fullSector->push_back(GAP2_FILL_BYTE);
+	}
+
+	bool lastBit = false;
+
+	if (doubleDensity == true) {
+		encodeMfm(bits, cursor, fullSector, lastBit);
+	}
+	else {
+		encodeFm(bits, cursor, fullSector);
+	}
+}
+
+class NorthstarEncoder : public AbstractEncoder
+{
+public:
+	NorthstarEncoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.northstar())
+	{}
+
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+		if ((physicalTrack >= 0) && (physicalTrack < 35))
+		{
+			for (int sectorId = 0; sectorId < 10; sectorId++)
+			{
+				const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+				if (sector)
+					sectors.push_back(sector);
+			}
+		}
+
+		return sectors;
+	}
+
+	std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		int bitsPerRevolution = 100000;
+		double clockRateUs = 4.00;
+
+		if ((physicalTrack < 0) || (physicalTrack >= 35) || sectors.empty())
+			return std::unique_ptr<Fluxmap>();
+
+		const auto& sector = *sectors.begin();
+		if (sector->data.size() == NORTHSTAR_PAYLOAD_SIZE_SD) {
+			bitsPerRevolution /= 2;		// FM
+		} else {
+			clockRateUs /= 2.00;
+		}
+
+		std::vector<bool> bits(bitsPerRevolution);
+		unsigned cursor = 0;
+
+		for (const auto& sectorData : sectors)
+			write_sector(bits, cursor, sectorData);
+
+		if (cursor > bits.size())
+			Error() << "track data overrun";
+
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(bits, clockRateUs * 1e3);
+		return fluxmap;
+	}
+
+private:
+	const NorthstarEncoderProto& _config;
+};
+
+std::unique_ptr<AbstractEncoder> createNorthstarEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new NorthstarEncoder(config));
+}
+
--- a/arch/northstar/northstar.h
+++ b/arch/northstar/northstar.h
@@ -0,0 +1,38 @@
+#ifndef NORTHSTAR_H
+#define NORTHSTAR_H
+
+/* Northstar floppies are 10-hard sectored disks with a sector format as follows:
+ *
+ * |----------------------------------|
+ * | SYNC Byte  | Payload  | Checksum |
+ * |------------+----------+----------|
+ * | 1 (0xFB)   | 256 (SD) |    1     |
+ * | 2 (0xFBFB) | 512 (DD) |          |
+ * |----------------------------------|
+ *
+ */
+
+#define NORTHSTAR_PREAMBLE_SIZE_SD		(16)
+#define NORTHSTAR_PREAMBLE_SIZE_DD		(32)
+#define NORTHSTAR_HEADER_SIZE_SD		(1)
+#define NORTHSTAR_HEADER_SIZE_DD		(2)
+#define NORTHSTAR_PAYLOAD_SIZE_SD		(256)
+#define NORTHSTAR_PAYLOAD_SIZE_DD		(512)
+#define NORTHSTAR_CHECKSUM_SIZE		(1)
+#define NORTHSTAR_ENCODED_SECTOR_SIZE_SD	(NORTHSTAR_HEADER_SIZE_SD + NORTHSTAR_PAYLOAD_SIZE_SD + NORTHSTAR_CHECKSUM_SIZE)
+#define NORTHSTAR_ENCODED_SECTOR_SIZE_DD	(NORTHSTAR_HEADER_SIZE_DD + NORTHSTAR_PAYLOAD_SIZE_DD + NORTHSTAR_CHECKSUM_SIZE)
+
+#define SECTOR_TYPE_MFM			(0)
+#define SECTOR_TYPE_FM				(1)
+
+class AbstractDecoder;
+class AbstractEncoder;
+class EncoderProto;
+class DecoderProto;
+
+extern uint8_t northstarChecksum(const Bytes& bytes);
+
+extern std::unique_ptr<AbstractDecoder> createNorthstarDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createNorthstarEncoder(const EncoderProto& config);
+
+#endif /* NORTHSTAR */
--- a/arch/northstar/northstar.proto
+++ b/arch/northstar/northstar.proto
@@ -0,0 +1,5 @@
+syntax = "proto2";
+
+message NorthstarDecoderProto {}
+message NorthstarEncoderProto {}
+
--- a/arch/tids990/decoder.cc
+++ b/arch/tids990/decoder.cc
@@ -0,0 +1,98 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "tids990/tids990.h"
+#include "crc.h"
+#include "fluxmap.h"
+#include "decoders/fluxmapreader.h"
+#include "sector.h"
+#include <string.h>
+#include <fmt/format.h>
+
+/* The Texas Instruments DS990 uses MFM with a scheme similar to a simplified
+ * version of the IBM record scheme (it's actually easier to parse than IBM).
+ * There are 26 sectors per track, each holding a rather weird 288 bytes.
+ */
+
+/*
+ * Sector record:
+ * data:    0  1  0  1  0  1  0  1 .0  0  0  0  1  0  1  0  = 0x550a
+ * mfm:     00 01 00 01 00 01 00 01.00 10 10 10 01 00 01 00 = 0x11112a44
+ * special: 00 01 00 01 00 01 00 01.00 10 00 10 01 00 01 00 = 0x11112244
+ *                                        ^^
+ * When shifted out of phase, the special 0xa1 byte becomes an illegal
+ * encoding (you can't do 10 00). So this can't be spoofed by user data.
+ */
+const FluxPattern SECTOR_RECORD_PATTERN(32, 0x11112244);
+
+/*
+ * Data record:
+ * data:    0  1  0  1  0  1  0  1 .0  0  0  0  1  0  1  1  = 0x550c
+ * mfm:     00 01 00 01 00 01 00 01.00 10 10 10 01 00 01 01 = 0x11112a45
+ * special: 00 01 00 01 00 01 00 01.00 10 00 10 01 00 01 01 = 0x11112245
+ *                                        ^^
+ * When shifted out of phase, the special 0xa1 byte becomes an illegal
+ * encoding (you can't do 10 00). So this can't be spoofed by user data.
+ */
+const FluxPattern DATA_RECORD_PATTERN(32, 0x11112245);
+
+const FluxMatchers ANY_RECORD_PATTERN({ &SECTOR_RECORD_PATTERN, &DATA_RECORD_PATTERN });
+
+class Tids990Decoder : public AbstractDecoder
+{
+public:
+	Tids990Decoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return RecordType::SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return RecordType::DATA_RECORD;
+		return RecordType::UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		auto bits = readRawBits(TIDS990_SECTOR_RECORD_SIZE*16);
+		auto bytes = decodeFmMfm(bits).slice(0, TIDS990_SECTOR_RECORD_SIZE);
+
+		ByteReader br(bytes);
+		uint16_t gotChecksum = crc16(CCITT_POLY, bytes.slice(1, TIDS990_SECTOR_RECORD_SIZE-3));
+
+		br.seek(2);
+		_sector->logicalSide = br.read_8() >> 3;
+		_sector->logicalTrack = br.read_8();
+		br.read_8(); /* number of sectors per track */
+		_sector->logicalSector = br.read_8();
+		br.read_be16(); /* sector size */
+		uint16_t wantChecksum = br.read_be16();
+
+		if (wantChecksum == gotChecksum)
+			_sector->status = Sector::DATA_MISSING; /* correct but unintuitive */
+	}
+
+	void decodeDataRecord()
+	{
+		auto bits = readRawBits(TIDS990_DATA_RECORD_SIZE*16);
+		auto bytes = decodeFmMfm(bits).slice(0, TIDS990_DATA_RECORD_SIZE);
+
+		ByteReader br(bytes);
+		uint16_t gotChecksum = crc16(CCITT_POLY, bytes.slice(1, TIDS990_DATA_RECORD_SIZE-3));
+
+		br.seek(2);
+		_sector->data = br.read(TIDS990_PAYLOAD_SIZE);
+		uint16_t wantChecksum = br.read_be16();
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createTids990Decoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new Tids990Decoder(config));
+}
+
--- a/arch/tids990/encoder.cc
+++ b/arch/tids990/encoder.cc
@@ -0,0 +1,168 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "tids990.h"
+#include "crc.h"
+#include "writer.h"
+#include "image.h"
+#include "arch/tids990/tids990.pb.h"
+#include "lib/encoders/encoders.pb.h"
+#include <fmt/format.h>
+
+static int charToInt(char c)
+{
+	if (isdigit(c))
+		return c - '0';
+	return 10 + tolower(c) - 'a';
+}
+
+static uint8_t decodeUint16(uint16_t raw)
+{
+	Bytes b;
+	ByteWriter bw(b);
+	bw.write_be16(raw);
+	return decodeFmMfm(b.toBits())[0];
+}
+
+class Tids990Encoder : public AbstractEncoder
+{
+public:
+	Tids990Encoder(const EncoderProto& config):
+		AbstractEncoder(config),
+		_config(config.tids990())
+	{}
+
+private:
+	void writeRawBits(uint32_t data, int width)
+	{
+		_cursor += width;
+		_lastBit = data & 1;
+		for (int i=0; i<width; i++)
+		{
+			unsigned pos = _cursor - i - 1;
+			if (pos < _bits.size())
+				_bits[pos] = data & 1;
+			data >>= 1;
+		}
+	}
+
+	void writeBytes(const Bytes& bytes)
+	{
+		encodeMfm(_bits, _cursor, bytes, _lastBit);
+	}
+
+	void writeBytes(int count, uint8_t byte)
+	{
+		Bytes bytes = { byte };
+		for (int i=0; i<count; i++)
+			writeBytes(bytes);
+	}
+
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+		for (char sectorChar : _config.sector_skew())
+        {
+			int sectorId = charToInt(sectorChar);
+			const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+			if (sector)
+				sectors.push_back(sector);
+        }
+
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+			const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+	{
+		double clockRateUs = 1e3 / _config.clock_rate_khz() / 2.0;
+		int bitsPerRevolution = (_config.track_length_ms() * 1000.0) / clockRateUs;
+		_bits.resize(bitsPerRevolution);
+		_cursor = 0;
+
+		uint8_t am1Unencoded = decodeUint16(_config.am1_byte());
+		uint8_t am2Unencoded = decodeUint16(_config.am2_byte());
+
+		writeBytes(_config.gap1_bytes(), 0x55);
+
+		bool first = true;
+		for (char sectorChar : _config.sector_skew())
+		{
+			int sectorId = charToInt(sectorChar);
+			if (!first)
+				writeBytes(_config.gap3_bytes(), 0x55);
+			first = false;
+
+			const auto& sectorData = image.get(physicalTrack, physicalSide, sectorId);
+			if (!sectorData)
+				Error() << fmt::format("format tried to find sector {} which wasn't in the input file", sectorId);
+
+			/* Writing the sector and data records are fantastically annoying.
+			 * The CRC is calculated from the *very start* of the record, and
+			 * include the malformed marker bytes. Our encoder doesn't know
+			 * about this, of course, with the result that we have to construct
+			 * the unencoded header, calculate the checksum, and then use the
+			 * same logic to emit the bytes which require special encoding
+			 * before encoding the rest of the header normally. */
+
+			{
+				Bytes header;
+				ByteWriter bw(header);
+
+				writeBytes(12, 0x55);
+				bw.write_8(am1Unencoded);
+				bw.write_8(sectorData->logicalSide << 3);
+				bw.write_8(sectorData->logicalTrack);
+				bw.write_8(_config.sector_count());
+				bw.write_8(sectorData->logicalSector);
+				bw.write_be16(sectorData->data.size());
+				uint16_t crc = crc16(CCITT_POLY, header);
+				bw.write_be16(crc);
+
+				writeRawBits(_config.am1_byte(), 16);
+				writeBytes(header.slice(1));
+			}
+
+			writeBytes(_config.gap2_bytes(), 0x55);
+
+			{
+				Bytes data;
+				ByteWriter bw(data);
+
+				writeBytes(12, 0x55);
+				bw.write_8(am2Unencoded);
+
+				bw += sectorData->data;
+				uint16_t crc = crc16(CCITT_POLY, data);
+				bw.write_be16(crc);
+
+				writeRawBits(_config.am2_byte(), 16);
+				writeBytes(data.slice(1));
+			}
+		}
+
+		if (_cursor >= _bits.size())
+			Error() << "track data overrun";
+		while (_cursor < _bits.size())
+			writeBytes(1, 0x55);
+		
+		std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+		fluxmap->appendBits(_bits, clockRateUs*1e3);
+		return fluxmap;
+	}
+
+private:
+	const Tids990EncoderProto& _config;
+	std::vector<bool> _bits;
+	unsigned _cursor;
+	bool _lastBit;
+};
+
+std::unique_ptr<AbstractEncoder> createTids990Encoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new Tids990Encoder(config));
+}
+
+
--- a/arch/tids990/tids990.h
+++ b/arch/tids990/tids990.h
@@ -0,0 +1,18 @@
+#ifndef TIDS990_H
+#define TIDS990_H
+
+#define TIDS990_PAYLOAD_SIZE       288 /* bytes */
+#define TIDS990_SECTOR_RECORD_SIZE 10 /* bytes */
+#define TIDS990_DATA_RECORD_SIZE   (TIDS990_PAYLOAD_SIZE + 4) /* bytes */
+
+class AbstractEncoder;
+class AbstractDecoder;
+class DecoderProto;
+class EncoderProto;
+
+extern std::unique_ptr<AbstractDecoder> createTids990Decoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createTids990Encoder(const EncoderProto& config);
+
+#endif
+
+
--- a/arch/tids990/tids990.proto
+++ b/arch/tids990/tids990.proto
@@ -0,0 +1,26 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+message Tids990DecoderProto {}
+message Tids990EncoderProto {
+	optional double track_length_ms = 1 [ default = 166,
+		(help) = "length of a track" ];
+	optional int32 sector_count = 2 [ default = 26,
+		(help) = "number of sectors per track" ];
+	optional double clock_rate_khz = 3 [ default = 500,
+		(help) = "clock rate of data to write" ];
+	optional int32 am1_byte = 4 [ default = 0x2244,
+		(help) = "16-bit RAW bit pattern to use for the AM1 ID byte" ];
+	optional int32 am2_byte = 5 [ default = 0x2245,
+		(help) = "16-bit RAW bit pattern to use for the AM2 ID byte" ];
+	optional int32 gap1_bytes = 6 [ default = 80,
+		(help) = "size of gap 1 (the post-index gap)" ];
+	optional int32 gap2_bytes = 7 [ default = 21,
+		(help) = "size of gap 2 (the post-ID gap)" ];
+	optional int32 gap3_bytes = 8 [ default = 51,
+		(help) = "size of gap 3 (the post-data or format gap)" ];
+	optional string sector_skew = 9 [ default = "1mhc72nid83oje94pkfa50lgb6",
+		(help) = "order to emit sectors" ];
+}
+
--- a/arch/victor9k/decoder.cc
+++ b/arch/victor9k/decoder.cc
@@ -2,13 +2,11 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "victor9k.h"
 #include "crc.h"
 #include "bytes.h"
-#include "track.h"
 #include "fmt/format.h"
 #include <string.h>
 #include <algorithm>
@@ -27,7 +25,7 @@ static int decode_data_gcr(uint8_t gcr)
 		#undef GCR_ENTRY
    }
    return -1;
-};
+}

 static Bytes decode(const std::vector<bool>& bits)
 {
@@ -54,58 +52,73 @@ static Bytes decode(const std::vector<bool>& bits)
    return output;
 }

-AbstractDecoder::RecordType Victor9kDecoder::advanceToNextRecord()
+class Victor9kDecoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-	_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
-	if (matcher == &SECTOR_RECORD_PATTERN)
-		return SECTOR_RECORD;
-	if (matcher == &DATA_RECORD_PATTERN)
-		return DATA_RECORD;
-	return UNKNOWN_RECORD;
+public:
+	Victor9kDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_sector->clock = _fmr->seekToPattern(ANY_RECORD_PATTERN, matcher);
+		if (matcher == &SECTOR_RECORD_PATTERN)
+			return SECTOR_RECORD;
+		if (matcher == &DATA_RECORD_PATTERN)
+			return DATA_RECORD;
+		return UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		/* Skip the sync marker bit. */
+		readRawBits(22);
+
+		/* Read header. */
+
+		auto bytes = decode(readRawBits(4*10)).slice(0, 4);
+
+		uint8_t rawTrack = bytes[1];
+		_sector->logicalSector = bytes[2];
+		uint8_t gotChecksum = bytes[3];
+
+		_sector->logicalTrack = rawTrack & 0x7f;
+		_sector->logicalSide = rawTrack >> 7;
+		uint8_t wantChecksum = bytes[1] + bytes[2];
+		if ((_sector->logicalSector > 20) || (_sector->logicalTrack > 85) || (_sector->logicalSide > 1))
+			return;
+					
+		if (wantChecksum == gotChecksum)
+			_sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
+	}
+
+    void decodeDataRecord()
+	{
+		/* Skip the sync marker bit. */
+		readRawBits(22);
+
+		/* Read data. */
+
+		auto bytes = decode(readRawBits((VICTOR9K_SECTOR_LENGTH+5)*10))
+			.slice(0, VICTOR9K_SECTOR_LENGTH+5);
+		ByteReader br(bytes);
+
+		/* Check that this is actually a data record. */
+		
+		if (br.read_8() != 8)
+			return;
+
+		_sector->data = br.read(VICTOR9K_SECTOR_LENGTH);
+		uint16_t gotChecksum = sumBytes(_sector->data);
+		uint16_t wantChecksum = br.read_le16();
+		_sector->status = (gotChecksum == wantChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createVictor9kDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new Victor9kDecoder(config));
 }

-void Victor9kDecoder::decodeSectorRecord()
-{
-    /* Skip the sync marker bit. */
-    readRawBits(23);

-    /* Read header. */
-
-    auto bytes = decode(readRawBits(4*10)).slice(0, 4);
-
-    uint8_t rawTrack = bytes[1];
-    _sector->logicalSector = bytes[2];
-    uint8_t gotChecksum = bytes[3];
-
-    _sector->logicalTrack = rawTrack & 0x7f;
-    _sector->logicalSide = rawTrack >> 7;
-    uint8_t wantChecksum = bytes[1] + bytes[2];
-    if ((_sector->logicalSector > 20) || (_sector->logicalTrack > 85) || (_sector->logicalSide > 1))
-        return;
-                
-    if (wantChecksum == gotChecksum)
-        _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */
-}
-
-void Victor9kDecoder::decodeDataRecord()
-{
-    /* Skip the sync marker bit. */
-    readRawBits(23);
-
-    /* Read data. */
-
-    auto bytes = decode(readRawBits((VICTOR9K_SECTOR_LENGTH+5)*10))
-        .slice(0, VICTOR9K_SECTOR_LENGTH+5);
-    ByteReader br(bytes);
-
-    /* Check that this is actually a data record. */
-    
-    if (br.read_8() != 8)
-        return;
-
-    _sector->data = br.read(VICTOR9K_SECTOR_LENGTH);
-    uint16_t gotChecksum = sumBytes(_sector->data);
-    uint16_t wantChecksum = br.read_le16();
-    _sector->status = (gotChecksum == wantChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/victor9k/encoder.cc
+++ b/arch/victor9k/encoder.cc
@@ -0,0 +1,200 @@
+#include "globals.h"
+#include "decoders/decoders.h"
+#include "encoders/encoders.h"
+#include "victor9k.h"
+#include "crc.h"
+#include "sector.h"
+#include "writer.h"
+#include "image.h"
+#include "fmt/format.h"
+#include "arch/victor9k/victor9k.pb.h"
+#include "lib/encoders/encoders.pb.h"
+#include <ctype.h>
+#include "bytes.h"
+
+static bool lastBit;
+
+static void write_zero_bits(std::vector<bool>& bits, unsigned& cursor, unsigned count)
+{
+    while (count--)
+	{
+		if (cursor < bits.size())
+			lastBit = bits[cursor++] = 0;
+	}
+}
+
+static void write_one_bits(std::vector<bool>& bits, unsigned& cursor, unsigned count)
+{
+    while (count--)
+	{
+		if (cursor < bits.size())
+			lastBit = bits[cursor++] = 1;
+	}
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, const std::vector<bool>& src)
+{
+	for (bool bit : src)
+	{
+		if (cursor < bits.size())
+			lastBit = bits[cursor++] = bit;
+	}
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
+{
+	cursor += width;
+	lastBit = data & 1;
+	for (int i=0; i<width; i++)
+	{
+		unsigned pos = cursor - i - 1;
+		if (pos < bits.size())
+			bits[pos] = data & 1;
+		data >>= 1;
+	}
+}
+
+static void write_bits(std::vector<bool>& bits, unsigned& cursor, const Bytes& bytes)
+{
+	ByteReader br(bytes);
+	BitReader bitr(br);
+
+	while (!bitr.eof())
+	{
+		if (cursor < bits.size())
+			bits[cursor++] = bitr.get();
+	}
+}
+
+static int encode_data_gcr(uint8_t data)
+{
+    switch (data & 0x0f)
+    {
+        #define GCR_ENTRY(gcr, data) \
+            case data: return gcr;
+        #include "data_gcr.h"
+        #undef GCR_ENTRY
+    }
+    return -1;
+}
+
+static void write_bytes(std::vector<bool>& bits, unsigned& cursor, const Bytes& bytes)
+{
+    for (uint8_t b : bytes)
+    {
+        write_bits(bits, cursor, encode_data_gcr(b>>4), 5);
+        write_bits(bits, cursor, encode_data_gcr(b),    5);
+    }
+}
+
+static void write_sector(std::vector<bool>& bits, unsigned& cursor,
+		const Victor9kEncoderProto::TrackdataProto& trackdata,
+        const Sector& sector)
+{
+    write_one_bits(bits, cursor, trackdata.pre_header_sync_bits());
+    write_bits(bits, cursor, VICTOR9K_SECTOR_RECORD, 10);
+
+    uint8_t encodedTrack = sector.logicalTrack | (sector.logicalSide<<7);
+    uint8_t encodedSector = sector.logicalSector;
+    write_bytes(bits, cursor, Bytes {
+        encodedTrack,
+        encodedSector,
+        (uint8_t)(encodedTrack + encodedSector),
+    });
+
+
+    write_zero_bits(bits, cursor, trackdata.post_header_gap_bits());
+    write_one_bits(bits, cursor, trackdata.pre_data_sync_bits());
+    write_bits(bits, cursor, VICTOR9K_DATA_RECORD, 10);
+
+    write_bytes(bits, cursor, sector.data);
+
+    Bytes checksum(2);
+    checksum.writer().write_le16(sumBytes(sector.data));
+    write_bytes(bits, cursor, checksum);
+
+    write_zero_bits(bits, cursor, trackdata.post_data_gap_bits());
+}
+
+class Victor9kEncoder : public AbstractEncoder
+{
+public:
+	Victor9kEncoder(const EncoderProto& config):
+        AbstractEncoder(config),
+		_config(config.victor9k())
+	{}
+
+private:
+
+	void getTrackFormat(Victor9kEncoderProto::TrackdataProto& trackdata, unsigned cylinder, unsigned head)
+	{
+		trackdata.Clear();
+		for (const auto& f : _config.trackdata())
+		{
+			if (f.has_min_cylinder() && (cylinder < f.min_cylinder()))
+				continue;
+			if (f.has_max_cylinder() && (cylinder > f.max_cylinder()))
+				continue;
+			if (f.has_head() && (head != f.head()))
+				continue;
+
+			trackdata.MergeFrom(f);
+		}
+	}
+
+public:
+	std::vector<std::shared_ptr<Sector>> collectSectors(int physicalTrack, int physicalSide, const Image& image) override
+	{
+		std::vector<std::shared_ptr<Sector>> sectors;
+
+		Victor9kEncoderProto::TrackdataProto trackdata;
+		getTrackFormat(trackdata, physicalTrack, physicalSide);
+
+        for (int i = 0; i < trackdata.sector_range().sector_count(); i++)
+        {
+            int sectorId = trackdata.sector_range().start_sector() + i;
+			const auto& sector = image.get(physicalTrack, physicalSide, sectorId);
+			if (sector)
+				sectors.push_back(sector);
+        }
+
+		return sectors;
+	}
+
+    std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide,
+            const std::vector<std::shared_ptr<Sector>>& sectors, const Image& image) override
+    {
+		Victor9kEncoderProto::TrackdataProto trackdata;
+		getTrackFormat(trackdata, physicalTrack, physicalSide);
+
+        unsigned bitsPerRevolution = trackdata.original_data_rate_khz() * trackdata.original_period_ms();
+        std::vector<bool> bits(bitsPerRevolution);
+        double clockRateUs = 166666.0 / bitsPerRevolution;
+        unsigned cursor = 0;
+
+        fillBitmapTo(bits, cursor, trackdata.post_index_gap_us() / clockRateUs, { true, false });
+        lastBit = false;
+
+        for (const auto& sector : sectors)
+            write_sector(bits, cursor, trackdata, *sector);
+
+        if (cursor >= bits.size())
+            Error() << fmt::format("track data overrun by {} bits", cursor - bits.size());
+        fillBitmapTo(bits, cursor, bits.size(), { true, false });
+
+        std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
+        fluxmap->appendBits(bits, clockRateUs*1e3);
+        return fluxmap;
+    }
+
+private:
+	const Victor9kEncoderProto& _config;
+};
+
+std::unique_ptr<AbstractEncoder> createVictor9kEncoder(const EncoderProto& config)
+{
+	return std::unique_ptr<AbstractEncoder>(new Victor9kEncoder(config));
+}
+
+// vim: sw=4 ts=4 et
+
--- a/arch/victor9k/victor9k.h
+++ b/arch/victor9k/victor9k.h
@@ -1,22 +1,22 @@
 #ifndef VICTOR9K_H
 #define VICTOR9K_H

-#define VICTOR9K_SECTOR_RECORD 0xfffffeab
-#define VICTOR9K_DATA_RECORD   0xfffffea4
+class AbstractEncoder;
+class AbstractDecoder;
+class EncoderProto;
+class DecoderProto;
+
+/* ... 1101 0101 0111
+ *       ^^ ^^^^ ^^^^ ten bit IO byte */
+#define VICTOR9K_SECTOR_RECORD 0xfffffd57 
+
+/* ... 1101 0100 1001
+ *       ^^ ^^^^ ^^^^ ten bit IO byte */
+#define VICTOR9K_DATA_RECORD   0xfffffd49

 #define VICTOR9K_SECTOR_LENGTH 512

-class Sector;
-class Fluxmap;
-
-class Victor9kDecoder : public AbstractDecoder
-{
-public:
-    virtual ~Victor9kDecoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-    void decodeDataRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createVictor9kDecoder(const DecoderProto& config);
+extern std::unique_ptr<AbstractEncoder> createVictor9kEncoder(const EncoderProto& config);

 #endif
--- a/arch/victor9k/victor9k.proto
+++ b/arch/victor9k/victor9k.proto
@@ -0,0 +1,32 @@
+syntax = "proto2";
+
+import "lib/common.proto";
+
+message Victor9kDecoderProto {}
+
+// NEXT: 12
+message Victor9kEncoderProto {
+	message TrackdataProto {
+		message SectorRangeProto {
+			optional int32 start_sector = 1 [(help) = "first sector ID on track"];
+			optional int32 sector_count = 2 [(help) = "number of sectors on track"];
+		}
+
+		optional int32 min_cylinder = 1            [(help) = "minimum cylinder this format applies to"];
+		optional int32 max_cylinder = 2            [(help) = "maximum cylinder this format applies to"];
+		optional int32 head = 3                    [(help) = "which head this format applies to"];
+
+		optional double original_period_ms = 4     [(help) = "original rotational period of this cylinder"];
+		optional double original_data_rate_khz = 5 [(help) = "original data rate of this cylinder"];
+		optional double post_index_gap_us = 6      [(help) = "size of post-index gap"];
+		optional int32 pre_header_sync_bits = 10   [(help) = "number of sync bits before the sector header"];
+		optional int32 pre_data_sync_bits = 8      [(help) = "number of sync bits before the sector data"];
+		optional int32 post_data_gap_bits = 9      [(help) = "size of gap between data and the next header"];
+		optional int32 post_header_gap_bits = 11   [(help) = "size of gap between header and the data"];
+
+		optional SectorRangeProto sector_range = 7 [(help) = "write these sectors on each track"];
+	}
+
+	repeated TrackdataProto trackdata = 1;
+}
+
--- a/arch/zilogmcz/decoder.cc
+++ b/arch/zilogmcz/decoder.cc
@@ -2,7 +2,6 @@
 #include "fluxmap.h"
 #include "decoders/fluxmapreader.h"
 #include "protocol.h"
-#include "record.h"
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "zilogmcz.h"
@@ -14,35 +13,49 @@

 static const FluxPattern SECTOR_START_PATTERN(16, 0xaaab);

-AbstractDecoder::RecordType ZilogMczDecoder::advanceToNextRecord()
+class ZilogMczDecoder : public AbstractDecoder
 {
-	const FluxMatcher* matcher = nullptr;
-    _fmr->seekToIndexMark();
-	_sector->clock = _fmr->seekToPattern(SECTOR_START_PATTERN, matcher);
-	if (matcher == &SECTOR_START_PATTERN)
-		return SECTOR_RECORD;
-	return UNKNOWN_RECORD;
+public:
+	ZilogMczDecoder(const DecoderProto& config):
+		AbstractDecoder(config)
+	{}
+
+    RecordType advanceToNextRecord()
+	{
+		const FluxMatcher* matcher = nullptr;
+		_fmr->seekToIndexMark();
+		_sector->clock = _fmr->seekToPattern(SECTOR_START_PATTERN, matcher);
+		if (matcher == &SECTOR_START_PATTERN)
+			return SECTOR_RECORD;
+		return UNKNOWN_RECORD;
+	}
+
+    void decodeSectorRecord()
+	{
+		readRawBits(14);
+
+		auto rawbits = readRawBits(140*16);
+		auto bytes = decodeFmMfm(rawbits).slice(0, 140);
+		ByteReader br(bytes);
+
+		_sector->logicalSector = br.read_8() & 0x1f;
+		_sector->logicalSide = 0;
+		_sector->logicalTrack = br.read_8() & 0x7f;
+		if (_sector->logicalSector > 31)
+			return;
+		if (_sector->logicalTrack > 80)
+			return;
+
+		_sector->data = br.read(132);
+		uint16_t wantChecksum = br.read_be16();
+		uint16_t gotChecksum = crc16(MODBUS_POLY, 0x0000, bytes.slice(0, 134));
+
+		_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+	}
+};
+
+std::unique_ptr<AbstractDecoder> createZilogMczDecoder(const DecoderProto& config)
+{
+	return std::unique_ptr<AbstractDecoder>(new ZilogMczDecoder(config));
 }

-void ZilogMczDecoder::decodeSectorRecord()
-{
-    readRawBits(14);
-
-    auto rawbits = readRawBits(140*16);
-    auto bytes = decodeFmMfm(rawbits).slice(0, 140);
-    ByteReader br(bytes);
-
-    _sector->logicalSector = br.read_8() & 0x1f;
-    _sector->logicalSide = 0;
-    _sector->logicalTrack = br.read_8() & 0x7f;
-    if (_sector->logicalSector > 31)
-        return;
-    if (_sector->logicalTrack > 80)
-        return;
-
-    _sector->data = br.read(132);
-    uint16_t wantChecksum = br.read_be16();
-    uint16_t gotChecksum = crc16(MODBUS_POLY, 0x0000, bytes.slice(0, 134));
-
-    _sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
-}
--- a/arch/zilogmcz/zilogmcz.h
+++ b/arch/zilogmcz/zilogmcz.h
@@ -1,17 +1,7 @@
 #ifndef ZILOGMCZ_H
 #define ZILOGMCZ_H

-class Sector;
-class Fluxmap;
-
-class ZilogMczDecoder : public AbstractDecoder
-{
-public:
-    virtual ~ZilogMczDecoder() {}
-
-    RecordType advanceToNextRecord();
-    void decodeSectorRecord();
-};
+extern std::unique_ptr<AbstractDecoder> createZilogMczDecoder(const DecoderProto& config);

 #endif

--- a/arch/zilogmcz/zilogmcz.proto
+++ b/arch/zilogmcz/zilogmcz.proto
@@ -0,0 +1,4 @@
+syntax = "proto2";
+
+message ZilogMczDecoderProto {}
+
--- a/dep/agg/AUTHORS
+++ b/dep/agg/AUTHORS
@@ -0,0 +1,2 @@
+Anti-Grain Geometry - Version 2.4
+Copyright (C) 2002-2005 Maxim Shemanarev (McSeem) 
--- a/dep/agg/README
+++ b/dep/agg/README
@@ -0,0 +1,63 @@
+The Anti-Grain Geometry Project
+A high quality rendering engine for C++
+http://antigrain.com
+
+Anti-Grain Geometry - Version 2.4
+Copyright (C) 2002-2005 Maxim Shemanarev (McSeem)
+
+Permission to copy, use, modify, sell and distribute this software
+is granted provided this copyright notice appears in all copies.
+This software is provided "as is" without express or implied
+warranty, and with no claim as to its suitability for any purpose.
+
+---------------------------------
+
+Use automake to build the library.
+
+If automake is not available you still can use the old make.
+There is a very simple Makefile that can be used. Note that
+if you use automake it will overwrite Makefile.
+
+---------------------------------
+
+If building on AmigaOS 4.0 or higher type the following for
+instructions on what targets are available.
+ make -f Makefile.AmigaOS
+
+To just build and install AGG into the standard AmigaOS SDK
+ready for use type:
+ make -f Makefile.AmigaOS install
+
+If you just want to build one demo (e.g. lion) use:
+ make -f Makefile.AmigaOS bin/lion
+
+If you have any questions about the AmigaOS port please
+contact Steven Solie (ssolie@telus.net) for help.
+
+---------------------------------
+
+To build all examples using SDL (Mac or Linux) just type:
+
+cd /examples/sdl
+make
+
+Individual examples can be built with
+
+make aa_test
+
+In the same way the native Carbon examples can be built with
+
+cd /examples/macosx_carbon
+make
+
+In both cases the static library will be built (if it was not already) 
+from the existing global Makefile in /src/.
+
+The Makefiles for both SDL and Carbon will also attempt to download the 
+required .bmp files if they are not found in the system for a given 
+example. If the files could not be fetched (wget) the user will receive 
+a message explaining where to download the samples from (sphere.bmp, 
+etc.)  Since all programs reside in the same directory there is no need 
+to duplicate the .bmp files for each program that needs to use them.
+
+---------------------------------
--- a/dep/agg/README.md
+++ b/dep/agg/README.md
@@ -0,0 +1,7 @@
+This is a vary stripped down copy of the Anti-Grain Antialiasing graphics
+rendering library --- I've removed all the platform-specific and control stuff
+so that it can be used to generate memory images only.
+
+The original AGG site is dead, so this version is cloned from
+https://github.com/NNemec/antigrain.
+
--- a/dep/agg/UPSTREAM.md
+++ b/dep/agg/UPSTREAM.md
@@ -0,0 +1,7 @@
+This is a vary stripped down copy of the Anti-Grain Antialiasing graphics
+rendering library --- I've removed all the platform-specific and control stuff
+so that it can be used to generate memory images only.
+
+The original AGG site is dead, so this version is cloned from
+https://github.com/NNemec/antigrain.
+
--- a/dep/agg/include/Makefile.am
+++ b/dep/agg/include/Makefile.am
@@ -0,0 +1,49 @@
+SUBDIRS = ctrl util platform 
+
+aggincludedir = $(includedir)/agg2
+agginclude_HEADERS = \
+	agg_alpha_mask_u8.h          agg_glyph_raster_bin.h          agg_span_allocator.h \
+	agg_arc.h                    agg_gsv_text.h                  agg_span_converter.h \
+	agg_array.h                  agg_image_accessors.h           agg_span_gouraud.h \
+	agg_arrowhead.h              agg_image_filters.h             agg_span_gouraud_gray.h \
+	agg_basics.h                 agg_line_aa_basics.h            agg_span_gouraud_rgba.h \
+	agg_bezier_arc.h             agg_math.h                      agg_span_gradient.h \
+	agg_bitset_iterator.h        agg_blur.h                      agg_math_stroke.h \
+	agg_span_gradient_alpha.h    agg_gradient_lut.h \
+	agg_bounding_rect.h          agg_path_length.h               agg_span_image_filter.h \
+	agg_bspline.h                agg_path_storage.h              agg_span_image_filter_gray.h \
+	agg_clip_liang_barsky.h      agg_path_storage_integer.h      agg_span_image_filter_rgb.h \
+	agg_color_gray.h             agg_pattern_filters_rgba.h      agg_span_image_filter_rgba.h \
+	agg_color_rgba.h             agg_pixfmt_amask_adaptor.h      agg_span_interpolator_adaptor.h \
+	agg_config.h                 agg_pixfmt_gray.h               agg_span_interpolator_linear.h \
+	agg_conv_adaptor_vcgen.h     agg_pixfmt_rgb.h                agg_span_interpolator_persp.h \
+	agg_conv_adaptor_vpgen.h     agg_pixfmt_rgb_packed.h         agg_span_interpolator_trans.h \
+	agg_conv_bspline.h           agg_pixfmt_rgba.h               agg_pixfmt_transposer.h \
+	agg_span_pattern_gray.h \
+	agg_conv_clip_polygon.h      agg_rasterizer_cells_aa.h       agg_span_pattern_rgb.h \
+	agg_conv_clip_polyline.h     agg_rasterizer_compound_aa.h    agg_span_pattern_rgba.h \
+	agg_conv_close_polygon.h     agg_rasterizer_outline.h        agg_span_solid.h \
+	agg_conv_concat.h            agg_rasterizer_outline_aa.h     agg_span_subdiv_adaptor.h \
+	agg_conv_contour.h           agg_rasterizer_scanline_aa.h    agg_trans_affine.h \
+	agg_conv_curve.h             agg_rasterizer_sl_clip.h        agg_trans_bilinear.h \
+	agg_conv_dash.h              agg_renderer_base.h             agg_trans_double_path.h \
+	agg_conv_gpc.h               agg_renderer_markers.h \
+	agg_conv_marker.h            agg_renderer_mclip.h            agg_trans_perspective.h \
+	agg_conv_marker_adaptor.h    agg_renderer_outline_aa.h       agg_trans_single_path.h \
+	agg_conv_segmentator.h       agg_renderer_outline_image.h    agg_trans_viewport.h \
+	agg_conv_shorten_path.h      agg_renderer_primitives.h       agg_trans_warp_magnifier.h \
+	agg_conv_smooth_poly1.h      agg_renderer_raster_text.h      agg_vcgen_bspline.h \
+	agg_conv_stroke.h            agg_renderer_scanline.h         agg_vcgen_contour.h \
+	agg_conv_transform.h         agg_rendering_buffer.h          agg_vcgen_dash.h \
+	agg_conv_unclose_polygon.h   agg_rendering_buffer_dynarow.h  agg_vcgen_markers_term.h \
+	agg_curves.h                 agg_rounded_rect.h              agg_vcgen_smooth_poly1.h \
+	                             agg_scanline_bin.h              agg_vcgen_stroke.h \
+	agg_dda_line.h               agg_scanline_boolean_algebra.h  agg_vcgen_vertex_sequence.h \
+	agg_ellipse.h                agg_scanline_p.h                agg_vertex_sequence.h \
+	agg_ellipse_bresenham.h      agg_scanline_storage_aa.h       agg_vpgen_clip_polygon.h \
+	agg_embedded_raster_fonts.h  agg_scanline_storage_bin.h      agg_vpgen_clip_polyline.h \
+	agg_font_cache_manager.h     agg_scanline_u.h                agg_vpgen_segmentator.h \
+	agg_gamma_functions.h        agg_shorten_path.h \
+	agg_gamma_lut.h              agg_simul_eq.h \
+	agg_font_cache_manager2.h    agg_pixfmt_base.h               agg_rasterizer_scanline_aa_nogamma.h \
+	agg_span_gradient_contour.h  agg_span_gradient_image.h
--- a/dep/agg/include/agg2d.h
+++ b/dep/agg/include/agg2d.h
@@ -0,0 +1,568 @@
+//----------------------------------------------------------------------------
+// Agg2D - Version 1.0
+// Based on Anti-Grain Geometry
+// Copyright (C) 2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+//
+//	25 Jan 2007 - Ported to AGG 2.4 Jerry Evans (jerry@novadsp.com)
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG2D_INCLUDED
+#define AGG2D_INCLUDED
+
+// With this define uncommented you can use floating-point pixel format
+//#define AGG2D_USE_FLOAT_FORMAT
+
+#include "agg_basics.h"
+#include "agg_trans_affine.h"
+#include "agg_trans_viewport.h"
+#include "agg_path_storage.h"
+#include "agg_conv_stroke.h"
+#include "agg_conv_transform.h"
+#include "agg_conv_curve.h"
+#include "agg_rendering_buffer.h"
+#include "agg_renderer_base.h"
+#include "agg_renderer_scanline.h"
+#include "agg_span_gradient.h"
+#include "agg_span_image_filter_rgba.h"
+#include "agg_span_allocator.h"
+#include "agg_span_converter.h"
+#include "agg_span_interpolator_linear.h"
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_gamma_functions.h"
+#include "agg_scanline_u.h"
+#include "agg_bezier_arc.h"
+#include "agg_rounded_rect.h"
+#include "agg_font_cache_manager.h"
+
+#include "agg_pixfmt_rgba.h"
+#include "agg_image_accessors.h"
+#include <string>
+
+class Agg2D
+{
+#ifdef AGG2D_USE_FLOAT_FORMAT
+    typedef agg::rgba32 ColorType;
+#else
+    typedef agg::rgba8  ColorType;
+#endif
+    typedef agg::order_bgra ComponentOrder; // Platform dependent!
+    typedef agg::blender_rgba<ColorType, ComponentOrder>             Blender;
+    typedef agg::comp_op_adaptor_rgba<ColorType, ComponentOrder>     BlenderComp;
+    typedef agg::blender_rgba_pre<ColorType, ComponentOrder>         BlenderPre;
+    typedef agg::comp_op_adaptor_rgba_pre<ColorType, ComponentOrder> BlenderCompPre;
+
+    typedef agg::pixfmt_alpha_blend_rgba<Blender, agg::rendering_buffer>         PixFormat;
+    typedef agg::pixfmt_custom_blend_rgba<BlenderComp, agg::rendering_buffer>    PixFormatComp;
+    typedef agg::pixfmt_alpha_blend_rgba<BlenderPre, agg::rendering_buffer>      PixFormatPre;
+    typedef agg::pixfmt_custom_blend_rgba<BlenderCompPre, agg::rendering_buffer> PixFormatCompPre;
+
+    typedef agg::renderer_base<PixFormat>        RendererBase;
+    typedef agg::renderer_base<PixFormatComp>    RendererBaseComp;
+    typedef agg::renderer_base<PixFormatPre>     RendererBasePre;
+    typedef agg::renderer_base<PixFormatCompPre> RendererBaseCompPre;
+
+    typedef agg::renderer_scanline_aa_solid<RendererBase>     RendererSolid;
+    typedef agg::renderer_scanline_aa_solid<RendererBaseComp> RendererSolidComp;
+
+    typedef agg::span_allocator<ColorType> SpanAllocator;
+    typedef agg::pod_auto_array<ColorType, 256> GradientArray;
+
+    typedef agg::span_gradient<ColorType, agg::span_interpolator_linear<>, agg::gradient_x,      GradientArray> LinearGradientSpan;
+    typedef agg::span_gradient<ColorType, agg::span_interpolator_linear<>, agg::gradient_circle, GradientArray> RadialGradientSpan;
+
+    typedef agg::conv_curve<agg::path_storage>    ConvCurve;
+    typedef agg::conv_stroke<ConvCurve>           ConvStroke;
+    typedef agg::conv_transform<ConvCurve>        PathTransform;
+    typedef agg::conv_transform<ConvStroke>       StrokeTransform;
+
+    enum Gradient
+    {
+        Solid,
+        Linear,
+        Radial
+    };
+
+public:
+    friend class Agg2DRenderer;
+
+    // Use srgba8 as the "user" color type, even though the underlying color type 
+    // might be something else, such as rgba32. This allows code based on 
+    // 8-bit sRGB values to carry on working as before.
+    typedef agg::srgba8       Color;
+    typedef agg::rect_i       Rect;
+    typedef agg::rect_d       RectD;
+    typedef agg::trans_affine Affine;
+
+    enum LineJoin
+    {
+        JoinMiter = agg::miter_join,
+        JoinRound = agg::round_join,
+        JoinBevel = agg::bevel_join
+    };
+
+    enum LineCap
+    {
+        CapButt   = agg::butt_cap,
+        CapSquare = agg::square_cap,
+        CapRound  = agg::round_cap
+    };
+
+    enum TextAlignment
+    {
+        AlignLeft,
+        AlignRight,
+        AlignCenter,
+    };
+
+
+    enum DrawPathFlag
+    {
+        FillOnly,
+        StrokeOnly,
+        FillAndStroke,
+        FillWithLineColor
+    };
+
+    enum ViewportOption
+    {
+        Anisotropic,
+        XMinYMin,
+        XMidYMin,
+        XMaxYMin,
+        XMinYMid,
+        XMidYMid,
+        XMaxYMid,
+        XMinYMax,
+        XMidYMax,
+        XMaxYMax
+    };
+
+    struct Transformations
+    {
+        double affineMatrix[6];
+    };
+
+
+    struct Image
+    {
+        agg::rendering_buffer renBuf;
+
+        Image() {}
+        Image(unsigned char* buf, unsigned width, unsigned height, int stride) :
+            renBuf(buf, width, height, stride) {}
+        void attach(unsigned char* buf, unsigned width, unsigned height, int stride)
+        {
+            renBuf.attach(buf, width, height, stride);
+        }
+        int width()  const { return renBuf.width(); }
+        int height() const { return renBuf.height(); }
+        void premultiply();
+        void demultiply();
+    };
+
+    enum ImageFilter
+    {
+        NoFilter,
+        Bilinear,
+        Hanning,
+        Hermite,
+        Quadric,
+        Bicubic,
+        Catrom,
+        Spline16,
+        Spline36,
+        Blackman144
+    };
+
+    enum ImageResample
+    {
+        NoResample,
+        ResampleAlways,
+        ResampleOnZoomOut
+    };
+
+    enum FontCacheType
+    {
+        RasterFontCache,
+        VectorFontCache
+    };
+
+    enum BlendMode
+    {
+        BlendAlpha      = agg::end_of_comp_op_e,
+        BlendClear      = agg::comp_op_clear,
+        BlendSrc        = agg::comp_op_src,
+        BlendDst        = agg::comp_op_dst,
+        BlendSrcOver    = agg::comp_op_src_over,
+        BlendDstOver    = agg::comp_op_dst_over,
+        BlendSrcIn      = agg::comp_op_src_in,
+        BlendDstIn      = agg::comp_op_dst_in,
+        BlendSrcOut     = agg::comp_op_src_out,
+        BlendDstOut     = agg::comp_op_dst_out,
+        BlendSrcAtop    = agg::comp_op_src_atop,
+        BlendDstAtop    = agg::comp_op_dst_atop,
+        BlendXor        = agg::comp_op_xor,
+        BlendAdd        = agg::comp_op_plus,
+        BlendMultiply   = agg::comp_op_multiply,
+        BlendScreen     = agg::comp_op_screen,
+        BlendOverlay    = agg::comp_op_overlay,
+        BlendDarken     = agg::comp_op_darken,
+        BlendLighten    = agg::comp_op_lighten,
+        BlendColorDodge = agg::comp_op_color_dodge,
+        BlendColorBurn  = agg::comp_op_color_burn,
+        BlendHardLight  = agg::comp_op_hard_light,
+        BlendSoftLight  = agg::comp_op_soft_light,
+        BlendDifference = agg::comp_op_difference,
+        BlendExclusion  = agg::comp_op_exclusion,
+    };
+
+    enum Direction
+    {
+        CW, CCW
+    };
+
+    ~Agg2D();
+    Agg2D();
+
+    // Setup
+    //-----------------------
+    void  attach(unsigned char* buf, unsigned width, unsigned height, int stride);
+    void  attach(Image& img);
+
+    void  clipBox(double x1, double y1, double x2, double y2);
+    RectD clipBox() const;
+
+    void  clearAll(Color c);
+    void  clearAll(unsigned r, unsigned g, unsigned b, unsigned a = 255);
+
+    void  clearClipBox(Color c);
+    void  clearClipBox(unsigned r, unsigned g, unsigned b, unsigned a = 255);
+
+    // Conversions
+    //-----------------------
+    void   worldToScreen(double& x, double& y) const;
+    void   screenToWorld(double& x, double& y) const;
+    double worldToScreen(double scalar) const;
+    double screenToWorld(double scalar) const;
+    void   alignPoint(double& x, double& y) const;
+    bool   inBox(double worldX, double worldY) const;
+
+    // General Attributes
+    //-----------------------
+    void blendMode(BlendMode m);
+    BlendMode blendMode() const;
+
+    void imageBlendMode(BlendMode m);
+    BlendMode imageBlendMode() const;
+
+    void imageBlendColor(Color c);
+    void imageBlendColor(unsigned r, unsigned g, unsigned b, unsigned a = 255);
+    Color imageBlendColor() const;
+
+    void masterAlpha(double a);
+    double masterAlpha() const;
+
+    void antiAliasGamma(double g);
+    double antiAliasGamma() const;
+
+    void fillColor(Color c);
+    void fillColor(unsigned r, unsigned g, unsigned b, unsigned a = 255);
+    void noFill();
+
+    void lineColor(Color c);
+    void lineColor(unsigned r, unsigned g, unsigned b, unsigned a = 255);
+    void noLine();
+
+    Color fillColor() const;
+    Color lineColor() const;
+
+    void fillLinearGradient(double x1, double y1, double x2, double y2, Color c1, Color c2, double profile=1.0);
+    void lineLinearGradient(double x1, double y1, double x2, double y2, Color c1, Color c2, double profile=1.0);
+
+    void fillRadialGradient(double x, double y, double r, Color c1, Color c2, double profile=1.0);
+    void lineRadialGradient(double x, double y, double r, Color c1, Color c2, double profile=1.0);
+
+    void fillRadialGradient(double x, double y, double r, Color c1, Color c2, Color c3);
+    void lineRadialGradient(double x, double y, double r, Color c1, Color c2, Color c3);
+
+    void fillRadialGradient(double x, double y, double r);
+    void lineRadialGradient(double x, double y, double r);
+
+    void lineWidth(double w);
+    double lineWidth(double w) const;
+
+    void lineCap(LineCap cap);
+    LineCap lineCap() const;
+
+    void lineJoin(LineJoin join);
+    LineJoin lineJoin() const;
+
+    void fillEvenOdd(bool evenOddFlag);
+    bool fillEvenOdd() const;
+
+	void textAlignment(TextAlignment alignment);
+	void textSize(double sizeX, double sizeY);
+	inline void textSize(double size) { textSize(size, size); }
+
+    // Transformations
+    //-----------------------
+    Transformations transformations() const;
+    void transformations(const Transformations& tr);
+    void resetTransformations();
+    void affine(const Affine& tr);
+    void affine(const Transformations& tr);
+    void rotate(double angle);
+    void scale(double sx, double sy);
+    void skew(double sx, double sy);
+    void translate(double x, double y);
+    void parallelogram(double x1, double y1, double x2, double y2, const double* para);
+    void viewport(double worldX1,  double worldY1,  double worldX2,  double worldY2,
+                  double screenX1, double screenY1, double screenX2, double screenY2,
+                  ViewportOption opt=XMidYMid);
+
+    // Basic Shapes
+    //-----------------------
+    void line(double x1, double y1, double x2, double y2);
+    void triangle(double x1, double y1, double x2, double y2, double x3, double y3);
+    void rectangle(double x1, double y1, double x2, double y2);
+    void roundedRect(double x1, double y1, double x2, double y2, double r);
+    void roundedRect(double x1, double y1, double x2, double y2, double rx, double ry);
+    void roundedRect(double x1, double y1, double x2, double y2,
+                     double rxBottom, double ryBottom,
+                     double rxTop,    double ryTop);
+    void ellipse(double cx, double cy, double rx, double ry);
+    void arc(double cx, double cy, double rx, double ry, double start, double sweep);
+    void star(double cx, double cy, double r1, double r2, double startAngle, int numRays);
+    void curve(double x1, double y1, double x2, double y2, double x3, double y3);
+    void curve(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4);
+    void polygon(double* xy, int numPoints);
+    void polyline(double* xy, int numPoints);
+
+    // Path commands
+    //-----------------------
+    void resetPath();
+
+    void moveTo(double x, double y);
+    void moveRel(double dx, double dy);
+
+    void lineTo(double x, double y);
+    void lineRel(double dx, double dy);
+
+    void horLineTo(double x);
+    void horLineRel(double dx);
+
+    void verLineTo(double y);
+    void verLineRel(double dy);
+
+    void arcTo(double rx, double ry,
+               double angle,
+               bool largeArcFlag,
+               bool sweepFlag,
+               double x, double y);
+
+    void arcRel(double rx, double ry,
+                double angle,
+                bool largeArcFlag,
+                bool sweepFlag,
+                double dx, double dy);
+
+    void quadricCurveTo(double xCtrl, double yCtrl,
+                         double xTo,   double yTo);
+    void quadricCurveRel(double dxCtrl, double dyCtrl,
+                         double dxTo,   double dyTo);
+    void quadricCurveTo(double xTo, double yTo);
+    void quadricCurveRel(double dxTo, double dyTo);
+
+    void cubicCurveTo(double xCtrl1, double yCtrl1,
+                      double xCtrl2, double yCtrl2,
+                      double xTo,    double yTo);
+
+    void cubicCurveRel(double dxCtrl1, double dyCtrl1,
+                       double dxCtrl2, double dyCtrl2,
+                       double dxTo,    double dyTo);
+
+    void cubicCurveTo(double xCtrl2, double yCtrl2,
+                      double xTo,    double yTo);
+
+    void cubicCurveRel(double xCtrl2, double yCtrl2,
+                       double xTo,    double yTo);
+
+    void addEllipse(double cx, double cy, double rx, double ry, Direction dir);
+	void text(double x, double y, const std::string& text);
+    void closePolygon();
+
+    void drawPath(DrawPathFlag flag = FillAndStroke);
+    void drawPathNoTransform(DrawPathFlag flag = FillAndStroke);
+
+
+    // Image Transformations
+    //-----------------------
+    void imageFilter(ImageFilter f);
+    ImageFilter imageFilter() const;
+
+    void imageResample(ImageResample f);
+    ImageResample imageResample() const;
+
+    void transformImage(const Image& img,
+                           int imgX1,    int imgY1,    int imgX2,    int imgY2,
+                        double dstX1, double dstY1, double dstX2, double dstY2);
+
+    void transformImage(const Image& img,
+                        double dstX1, double dstY1, double dstX2, double dstY2);
+
+    void transformImage(const Image& img,
+                        int imgX1, int imgY1, int imgX2, int imgY2,
+                        const double* parallelogram);
+
+    void transformImage(const Image& img, const double* parallelogram);
+
+
+    void transformImagePath(const Image& img,
+                               int imgX1,    int imgY1,    int imgX2,    int imgY2,
+                            double dstX1, double dstY1, double dstX2, double dstY2);
+
+    void transformImagePath(const Image& img,
+                            double dstX1, double dstY1, double dstX2, double dstY2);
+
+    void transformImagePath(const Image& img,
+                            int imgX1, int imgY1, int imgX2, int imgY2,
+                            const double* parallelogram);
+
+    void transformImagePath(const Image& img, const double* parallelogram);
+
+
+    // Image Blending (no transformations available)
+    void blendImage(Image& img,
+                    int imgX1, int imgY1, int imgX2, int imgY2,
+                    double dstX, double dstY, unsigned alpha=255);
+    void blendImage(Image& img, double dstX, double dstY, unsigned alpha=255);
+
+
+    // Copy image directly, together with alpha-channel
+    void copyImage(Image& img,
+                   int imgX1, int imgY1, int imgX2, int imgY2,
+                   double dstX, double dstY);
+    void copyImage(Image& img, double dstX, double dstY);
+
+
+    // Auxiliary
+    //-----------------------
+    static double pi() { return agg::pi; }
+    static double deg2Rad(double v) { return v * agg::pi / 180.0; }
+    static double rad2Deg(double v) { return v * 180.0 / agg::pi; }
+
+private:
+    void render(bool fillColor);
+#ifdef AGG_USE_FONTS
+    void render(FontRasterizer& ras, FontScanline& sl);
+#endif // AGG_USE_FONTS
+
+    void addLine(double x1, double y1, double x2, double y2);
+    void updateRasterizerGamma();
+    void renderImage(const Image& img, int x1, int y1, int x2, int y2, const double* parl);
+
+    agg::rendering_buffer           m_rbuf;
+    PixFormat                       m_pixFormat;
+    PixFormatComp                   m_pixFormatComp;
+    PixFormatPre                    m_pixFormatPre;
+    PixFormatCompPre                m_pixFormatCompPre;
+    RendererBase                    m_renBase;
+    RendererBaseComp                m_renBaseComp;
+    RendererBasePre                 m_renBasePre;
+    RendererBaseCompPre             m_renBaseCompPre;
+    RendererSolid                   m_renSolid;
+    RendererSolidComp               m_renSolidComp;
+
+    SpanAllocator                   m_allocator;
+    RectD                           m_clipBox;
+
+    BlendMode                       m_blendMode;
+    BlendMode                       m_imageBlendMode;
+    Color                           m_imageBlendColor;
+
+    agg::scanline_u8                m_scanline;
+    agg::rasterizer_scanline_aa<>   m_rasterizer;
+
+    double                          m_masterAlpha;
+    double                          m_antiAliasGamma;
+
+    Color                           m_fillColor;
+    Color                           m_lineColor;
+    GradientArray                   m_fillGradient;
+    GradientArray                   m_lineGradient;
+
+    LineCap                         m_lineCap;
+    LineJoin                        m_lineJoin;
+
+    Gradient                        m_fillGradientFlag;
+    Gradient                        m_lineGradientFlag;
+    agg::trans_affine               m_fillGradientMatrix;
+    agg::trans_affine               m_lineGradientMatrix;
+    double                          m_fillGradientD1;
+    double                          m_lineGradientD1;
+    double                          m_fillGradientD2;
+    double                          m_lineGradientD2;
+
+    TextAlignment                   m_textAlignment;
+    double                          m_textSizeX;
+    double                          m_textSizeY;
+
+    ImageFilter                     m_imageFilter;
+    ImageResample                   m_imageResample;
+    agg::image_filter_lut           m_imageFilterLut;
+
+    agg::span_interpolator_linear<> m_fillGradientInterpolator;
+    agg::span_interpolator_linear<> m_lineGradientInterpolator;
+
+    agg::gradient_x                 m_linearGradientFunction;
+    agg::gradient_circle            m_radialGradientFunction;
+
+    double                          m_lineWidth;
+    bool                            m_evenOddFlag;
+
+    agg::path_storage               m_path;
+    agg::trans_affine               m_transform;
+
+    ConvCurve                       m_convCurve;
+    ConvStroke                      m_convStroke;
+
+    PathTransform                   m_pathTransform;
+    StrokeTransform                 m_strokeTransform;
+
+#ifdef AGG_USE_FONTS
+#ifndef AGG2D_USE_FREETYPE
+    HDC                             m_fontDC;
+#endif
+    FontEngine                      m_fontEngine;
+    FontCacheManager                m_fontCacheManager;
+#endif
+};
+
+
+inline bool operator == (const Agg2D::Color& c1, const Agg2D::Color& c2)
+{
+   return c1.r == c2.r && c1.g == c2.g && c1.b == c2.b && c1.a == c2.a;
+}
+
+inline bool operator != (const Agg2D::Color& c1, const Agg2D::Color& c2)
+{
+   return !(c1 == c2);
+}
+
+
+#endif
+
+
--- a/dep/agg/include/agg_alpha_mask_u8.h
+++ b/dep/agg/include/agg_alpha_mask_u8.h
@@ -0,0 +1,499 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// scanline_u8 class
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_ALPHA_MASK_U8_INCLUDED
+#define AGG_ALPHA_MASK_U8_INCLUDED
+
+#include <cstring>
+#include "agg_basics.h"
+#include "agg_rendering_buffer.h"
+
+namespace agg
+{
+    //===================================================one_component_mask_u8
+    struct one_component_mask_u8
+    {
+        static unsigned calculate(const int8u* p) { return *p; }
+    };
+    
+
+    //=====================================================rgb_to_gray_mask_u8
+    template<unsigned R, unsigned G, unsigned B>
+    struct rgb_to_gray_mask_u8
+    {
+        static unsigned calculate(const int8u* p) 
+        { 
+            return (p[R]*77 + p[G]*150 + p[B]*29) >> 8; 
+        }
+    };
+
+    //==========================================================alpha_mask_u8
+    template<unsigned Step=1, unsigned Offset=0, class MaskF=one_component_mask_u8>
+    class alpha_mask_u8
+    {
+    public:
+        typedef int8u cover_type;
+        typedef alpha_mask_u8<Step, Offset, MaskF> self_type;
+        enum cover_scale_e
+        { 
+            cover_shift = 8,
+            cover_none  = 0,
+            cover_full  = 255
+        };
+
+        alpha_mask_u8() : m_rbuf(0) {}
+        explicit alpha_mask_u8(rendering_buffer& rbuf) : m_rbuf(&rbuf) {}
+
+        void attach(rendering_buffer& rbuf) { m_rbuf = &rbuf; }
+
+        MaskF& mask_function() { return m_mask_function; }
+        const MaskF& mask_function() const { return m_mask_function; }
+
+        
+        //--------------------------------------------------------------------
+        cover_type pixel(int x, int y) const
+        {
+            if(x >= 0 && y >= 0 && 
+               x < (int)m_rbuf->width() && 
+               y < (int)m_rbuf->height())
+            {
+                return (cover_type)m_mask_function.calculate(
+                                        m_rbuf->row_ptr(y) + x * Step + Offset);
+            }
+            return 0;
+        }
+
+        //--------------------------------------------------------------------
+        cover_type combine_pixel(int x, int y, cover_type val) const
+        {
+            if(x >= 0 && y >= 0 && 
+               x < (int)m_rbuf->width() && 
+               y < (int)m_rbuf->height())
+            {
+                return (cover_type)((cover_full + val * 
+                                     m_mask_function.calculate(
+                                        m_rbuf->row_ptr(y) + x * Step + Offset)) >> 
+                                     cover_shift);
+            }
+            return 0;
+        }
+
+
+        //--------------------------------------------------------------------
+        void fill_hspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            int xmax = m_rbuf->width() - 1;
+            int ymax = m_rbuf->height() - 1;
+
+            int count = num_pix;
+            cover_type* covers = dst;
+
+            if(y < 0 || y > ymax)
+            {
+                std::memset(dst, 0, num_pix * sizeof(cover_type));
+                return;
+            }
+
+            if(x < 0)
+            {
+                count += x;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers, 0, -x * sizeof(cover_type));
+                covers -= x;
+                x = 0;
+            }
+
+            if(x + count > xmax)
+            {
+                int rest = x + count - xmax - 1;
+                count -= rest;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers + count, 0, rest * sizeof(cover_type));
+            }
+
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *covers++ = (cover_type)m_mask_function.calculate(mask);
+                mask += Step;
+            }
+            while(--count);
+        }
+
+
+        //--------------------------------------------------------------------
+        void combine_hspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            int xmax = m_rbuf->width() - 1;
+            int ymax = m_rbuf->height() - 1;
+
+            int count = num_pix;
+            cover_type* covers = dst;
+
+            if(y < 0 || y > ymax)
+            {
+                std::memset(dst, 0, num_pix * sizeof(cover_type));
+                return;
+            }
+
+            if(x < 0)
+            {
+                count += x;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers, 0, -x * sizeof(cover_type));
+                covers -= x;
+                x = 0;
+            }
+
+            if(x + count > xmax)
+            {
+                int rest = x + count - xmax - 1;
+                count -= rest;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers + count, 0, rest * sizeof(cover_type));
+            }
+
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *covers = (cover_type)((cover_full + (*covers) * 
+                                       m_mask_function.calculate(mask)) >> 
+                                       cover_shift);
+                ++covers;
+                mask += Step;
+            }
+            while(--count);
+        }
+
+        //--------------------------------------------------------------------
+        void fill_vspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            int xmax = m_rbuf->width() - 1;
+            int ymax = m_rbuf->height() - 1;
+
+            int count = num_pix;
+            cover_type* covers = dst;
+
+            if(x < 0 || x > xmax)
+            {
+                std::memset(dst, 0, num_pix * sizeof(cover_type));
+                return;
+            }
+
+            if(y < 0)
+            {
+                count += y;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers, 0, -y * sizeof(cover_type));
+                covers -= y;
+                y = 0;
+            }
+
+            if(y + count > ymax)
+            {
+                int rest = y + count - ymax - 1;
+                count -= rest;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers + count, 0, rest * sizeof(cover_type));
+            }
+
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *covers++ = (cover_type)m_mask_function.calculate(mask);
+                mask += m_rbuf->stride();
+            }
+            while(--count);
+        }
+
+        //--------------------------------------------------------------------
+        void combine_vspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            int xmax = m_rbuf->width() - 1;
+            int ymax = m_rbuf->height() - 1;
+
+            int count = num_pix;
+            cover_type* covers = dst;
+
+            if(x < 0 || x > xmax)
+            {
+                std::memset(dst, 0, num_pix * sizeof(cover_type));
+                return;
+            }
+
+            if(y < 0)
+            {
+                count += y;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers, 0, -y * sizeof(cover_type));
+                covers -= y;
+                y = 0;
+            }
+
+            if(y + count > ymax)
+            {
+                int rest = y + count - ymax - 1;
+                count -= rest;
+                if(count <= 0) 
+                {
+                    std::memset(dst, 0, num_pix * sizeof(cover_type));
+                    return;
+                }
+                std::memset(covers + count, 0, rest * sizeof(cover_type));
+            }
+
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *covers = (cover_type)((cover_full + (*covers) * 
+                                       m_mask_function.calculate(mask)) >> 
+                                       cover_shift);
+                ++covers;
+                mask += m_rbuf->stride();
+            }
+            while(--count);
+        }
+
+
+    private:
+        alpha_mask_u8(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        rendering_buffer* m_rbuf;
+        MaskF             m_mask_function;
+    };
+    
+
+    typedef alpha_mask_u8<1, 0> alpha_mask_gray8;   //----alpha_mask_gray8
+
+    typedef alpha_mask_u8<3, 0> alpha_mask_rgb24r;  //----alpha_mask_rgb24r
+    typedef alpha_mask_u8<3, 1> alpha_mask_rgb24g;  //----alpha_mask_rgb24g
+    typedef alpha_mask_u8<3, 2> alpha_mask_rgb24b;  //----alpha_mask_rgb24b
+
+    typedef alpha_mask_u8<3, 2> alpha_mask_bgr24r;  //----alpha_mask_bgr24r
+    typedef alpha_mask_u8<3, 1> alpha_mask_bgr24g;  //----alpha_mask_bgr24g
+    typedef alpha_mask_u8<3, 0> alpha_mask_bgr24b;  //----alpha_mask_bgr24b
+
+    typedef alpha_mask_u8<4, 0> alpha_mask_rgba32r; //----alpha_mask_rgba32r
+    typedef alpha_mask_u8<4, 1> alpha_mask_rgba32g; //----alpha_mask_rgba32g
+    typedef alpha_mask_u8<4, 2> alpha_mask_rgba32b; //----alpha_mask_rgba32b
+    typedef alpha_mask_u8<4, 3> alpha_mask_rgba32a; //----alpha_mask_rgba32a
+
+    typedef alpha_mask_u8<4, 1> alpha_mask_argb32r; //----alpha_mask_argb32r
+    typedef alpha_mask_u8<4, 2> alpha_mask_argb32g; //----alpha_mask_argb32g
+    typedef alpha_mask_u8<4, 3> alpha_mask_argb32b; //----alpha_mask_argb32b
+    typedef alpha_mask_u8<4, 0> alpha_mask_argb32a; //----alpha_mask_argb32a
+
+    typedef alpha_mask_u8<4, 2> alpha_mask_bgra32r; //----alpha_mask_bgra32r
+    typedef alpha_mask_u8<4, 1> alpha_mask_bgra32g; //----alpha_mask_bgra32g
+    typedef alpha_mask_u8<4, 0> alpha_mask_bgra32b; //----alpha_mask_bgra32b
+    typedef alpha_mask_u8<4, 3> alpha_mask_bgra32a; //----alpha_mask_bgra32a
+
+    typedef alpha_mask_u8<4, 3> alpha_mask_abgr32r; //----alpha_mask_abgr32r
+    typedef alpha_mask_u8<4, 2> alpha_mask_abgr32g; //----alpha_mask_abgr32g
+    typedef alpha_mask_u8<4, 1> alpha_mask_abgr32b; //----alpha_mask_abgr32b
+    typedef alpha_mask_u8<4, 0> alpha_mask_abgr32a; //----alpha_mask_abgr32a
+
+    typedef alpha_mask_u8<3, 0, rgb_to_gray_mask_u8<0, 1, 2> > alpha_mask_rgb24gray;  //----alpha_mask_rgb24gray
+    typedef alpha_mask_u8<3, 0, rgb_to_gray_mask_u8<2, 1, 0> > alpha_mask_bgr24gray;  //----alpha_mask_bgr24gray
+    typedef alpha_mask_u8<4, 0, rgb_to_gray_mask_u8<0, 1, 2> > alpha_mask_rgba32gray; //----alpha_mask_rgba32gray
+    typedef alpha_mask_u8<4, 1, rgb_to_gray_mask_u8<0, 1, 2> > alpha_mask_argb32gray; //----alpha_mask_argb32gray
+    typedef alpha_mask_u8<4, 0, rgb_to_gray_mask_u8<2, 1, 0> > alpha_mask_bgra32gray; //----alpha_mask_bgra32gray
+    typedef alpha_mask_u8<4, 1, rgb_to_gray_mask_u8<2, 1, 0> > alpha_mask_abgr32gray; //----alpha_mask_abgr32gray
+
+
+
+    //==========================================================amask_no_clip_u8
+    template<unsigned Step=1, unsigned Offset=0, class MaskF=one_component_mask_u8>
+    class amask_no_clip_u8
+    {
+    public:
+        typedef int8u cover_type;
+        typedef amask_no_clip_u8<Step, Offset, MaskF> self_type;
+        enum cover_scale_e
+        { 
+            cover_shift = 8,
+            cover_none  = 0,
+            cover_full  = 255
+        };
+
+        amask_no_clip_u8() : m_rbuf(0) {}
+        explicit amask_no_clip_u8(rendering_buffer& rbuf) : m_rbuf(&rbuf) {}
+
+        void attach(rendering_buffer& rbuf) { m_rbuf = &rbuf; }
+
+        MaskF& mask_function() { return m_mask_function; }
+        const MaskF& mask_function() const { return m_mask_function; }
+
+
+        //--------------------------------------------------------------------
+        cover_type pixel(int x, int y) const
+        {
+            return (cover_type)m_mask_function.calculate(
+                                   m_rbuf->row_ptr(y) + x * Step + Offset);
+        }
+
+        
+        //--------------------------------------------------------------------
+        cover_type combine_pixel(int x, int y, cover_type val) const
+        {
+            return (cover_type)((cover_full + val * 
+                                 m_mask_function.calculate(
+                                    m_rbuf->row_ptr(y) + x * Step + Offset)) >> 
+                                 cover_shift);
+        }
+
+
+        //--------------------------------------------------------------------
+        void fill_hspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *dst++ = (cover_type)m_mask_function.calculate(mask);
+                mask += Step;
+            }
+            while(--num_pix);
+        }
+
+
+
+        //--------------------------------------------------------------------
+        void combine_hspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *dst = (cover_type)((cover_full + (*dst) * 
+                                    m_mask_function.calculate(mask)) >> 
+                                    cover_shift);
+                ++dst;
+                mask += Step;
+            }
+            while(--num_pix);
+        }
+
+
+        //--------------------------------------------------------------------
+        void fill_vspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *dst++ = (cover_type)m_mask_function.calculate(mask);
+                mask += m_rbuf->stride();
+            }
+            while(--num_pix);
+        }
+
+
+        //--------------------------------------------------------------------
+        void combine_vspan(int x, int y, cover_type* dst, int num_pix) const
+        {
+            const int8u* mask = m_rbuf->row_ptr(y) + x * Step + Offset;
+            do
+            {
+                *dst = (cover_type)((cover_full + (*dst) * 
+                                    m_mask_function.calculate(mask)) >> 
+                                    cover_shift);
+                ++dst;
+                mask += m_rbuf->stride();
+            }
+            while(--num_pix);
+        }
+
+    private:
+        amask_no_clip_u8(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        rendering_buffer* m_rbuf;
+        MaskF             m_mask_function;
+    };
+    
+
+    typedef amask_no_clip_u8<1, 0> amask_no_clip_gray8;   //----amask_no_clip_gray8
+
+    typedef amask_no_clip_u8<3, 0> amask_no_clip_rgb24r;  //----amask_no_clip_rgb24r
+    typedef amask_no_clip_u8<3, 1> amask_no_clip_rgb24g;  //----amask_no_clip_rgb24g
+    typedef amask_no_clip_u8<3, 2> amask_no_clip_rgb24b;  //----amask_no_clip_rgb24b
+
+    typedef amask_no_clip_u8<3, 2> amask_no_clip_bgr24r;  //----amask_no_clip_bgr24r
+    typedef amask_no_clip_u8<3, 1> amask_no_clip_bgr24g;  //----amask_no_clip_bgr24g
+    typedef amask_no_clip_u8<3, 0> amask_no_clip_bgr24b;  //----amask_no_clip_bgr24b
+
+    typedef amask_no_clip_u8<4, 0> amask_no_clip_rgba32r; //----amask_no_clip_rgba32r
+    typedef amask_no_clip_u8<4, 1> amask_no_clip_rgba32g; //----amask_no_clip_rgba32g
+    typedef amask_no_clip_u8<4, 2> amask_no_clip_rgba32b; //----amask_no_clip_rgba32b
+    typedef amask_no_clip_u8<4, 3> amask_no_clip_rgba32a; //----amask_no_clip_rgba32a
+
+    typedef amask_no_clip_u8<4, 1> amask_no_clip_argb32r; //----amask_no_clip_argb32r
+    typedef amask_no_clip_u8<4, 2> amask_no_clip_argb32g; //----amask_no_clip_argb32g
+    typedef amask_no_clip_u8<4, 3> amask_no_clip_argb32b; //----amask_no_clip_argb32b
+    typedef amask_no_clip_u8<4, 0> amask_no_clip_argb32a; //----amask_no_clip_argb32a
+
+    typedef amask_no_clip_u8<4, 2> amask_no_clip_bgra32r; //----amask_no_clip_bgra32r
+    typedef amask_no_clip_u8<4, 1> amask_no_clip_bgra32g; //----amask_no_clip_bgra32g
+    typedef amask_no_clip_u8<4, 0> amask_no_clip_bgra32b; //----amask_no_clip_bgra32b
+    typedef amask_no_clip_u8<4, 3> amask_no_clip_bgra32a; //----amask_no_clip_bgra32a
+
+    typedef amask_no_clip_u8<4, 3> amask_no_clip_abgr32r; //----amask_no_clip_abgr32r
+    typedef amask_no_clip_u8<4, 2> amask_no_clip_abgr32g; //----amask_no_clip_abgr32g
+    typedef amask_no_clip_u8<4, 1> amask_no_clip_abgr32b; //----amask_no_clip_abgr32b
+    typedef amask_no_clip_u8<4, 0> amask_no_clip_abgr32a; //----amask_no_clip_abgr32a
+
+    typedef amask_no_clip_u8<3, 0, rgb_to_gray_mask_u8<0, 1, 2> > amask_no_clip_rgb24gray;  //----amask_no_clip_rgb24gray
+    typedef amask_no_clip_u8<3, 0, rgb_to_gray_mask_u8<2, 1, 0> > amask_no_clip_bgr24gray;  //----amask_no_clip_bgr24gray
+    typedef amask_no_clip_u8<4, 0, rgb_to_gray_mask_u8<0, 1, 2> > amask_no_clip_rgba32gray; //----amask_no_clip_rgba32gray
+    typedef amask_no_clip_u8<4, 1, rgb_to_gray_mask_u8<0, 1, 2> > amask_no_clip_argb32gray; //----amask_no_clip_argb32gray
+    typedef amask_no_clip_u8<4, 0, rgb_to_gray_mask_u8<2, 1, 0> > amask_no_clip_bgra32gray; //----amask_no_clip_bgra32gray
+    typedef amask_no_clip_u8<4, 1, rgb_to_gray_mask_u8<2, 1, 0> > amask_no_clip_abgr32gray; //----amask_no_clip_abgr32gray
+
+
+}
+
+
+
+#endif
--- a/dep/agg/include/agg_arc.h
+++ b/dep/agg/include/agg_arc.h
@@ -0,0 +1,73 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Arc vertex generator
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_ARC_INCLUDED
+#define AGG_ARC_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //=====================================================================arc
+    //
+    // See Implementation agg_arc.cpp 
+    //
+    class arc
+    {
+    public:
+        arc() : m_scale(1.0), m_initialized(false) {}
+        arc(double x,  double y, 
+            double rx, double ry, 
+            double a1, double a2, 
+            bool ccw=true);
+
+        void init(double x,  double y, 
+                  double rx, double ry, 
+                  double a1, double a2, 
+                  bool ccw=true);
+
+        void approximation_scale(double s);
+        double approximation_scale() const { return m_scale;  }
+
+        void rewind(unsigned);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        void normalize(double a1, double a2, bool ccw);
+
+        double   m_x;
+        double   m_y;
+        double   m_rx;
+        double   m_ry;
+        double   m_angle;
+        double   m_start;
+        double   m_end;
+        double   m_scale;
+        double   m_da;
+        bool     m_ccw;
+        bool     m_initialized;
+        unsigned m_path_cmd;
+    };
+
+
+}
+
+
+#endif
--- a/dep/agg/include/agg_array.h
+++ b/dep/agg/include/agg_array.h
--- a/dep/agg/include/agg_arrowhead.h
+++ b/dep/agg/include/agg_arrowhead.h
@@ -0,0 +1,82 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Simple arrowhead/arrowtail generator 
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_ARROWHEAD_INCLUDED
+#define AGG_ARROWHEAD_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //===============================================================arrowhead
+    //
+    // See implementation agg_arrowhead.cpp 
+    //
+    class arrowhead
+    {
+    public:
+        arrowhead();
+
+        void head(double d1, double d2, double d3, double d4)
+        {
+            m_head_d1 = d1;
+            m_head_d2 = d2;
+            m_head_d3 = d3;
+            m_head_d4 = d4;
+            m_head_flag = true;
+        }
+
+        void head()    { m_head_flag = true; }
+        void no_head() { m_head_flag = false; }
+
+        void tail(double d1, double d2, double d3, double d4)
+        {
+            m_tail_d1 = d1;
+            m_tail_d2 = d2;
+            m_tail_d3 = d3;
+            m_tail_d4 = d4;
+            m_tail_flag = true;
+        }
+
+        void tail()    { m_tail_flag = true;  }
+        void no_tail() { m_tail_flag = false; }
+
+        void rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        double   m_head_d1;
+        double   m_head_d2;
+        double   m_head_d3;
+        double   m_head_d4;
+        double   m_tail_d1;
+        double   m_tail_d2;
+        double   m_tail_d3;
+        double   m_tail_d4;
+        bool     m_head_flag;
+        bool     m_tail_flag;
+        double   m_coord[16];
+        unsigned m_cmd[8];
+        unsigned m_curr_id;
+        unsigned m_curr_coord;
+    };
+
+}
+
+#endif
--- a/dep/agg/include/agg_basics.h
+++ b/dep/agg/include/agg_basics.h
@@ -0,0 +1,574 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_BASICS_INCLUDED
+#define AGG_BASICS_INCLUDED
+
+#include <cmath>
+#include "agg_config.h"
+
+//---------------------------------------------------------AGG_CUSTOM_ALLOCATOR
+#ifdef AGG_CUSTOM_ALLOCATOR
+#include "agg_allocator.h"
+#else
+namespace agg
+{
+    // The policy of all AGG containers and memory allocation strategy 
+    // in general is that no allocated data requires explicit construction.
+    // It means that the allocator can be really simple; you can even
+    // replace new/delete to malloc/free. The constructors and destructors 
+    // won't be called in this case, however everything will remain working. 
+    // The second argument of deallocate() is the size of the allocated 
+    // block. You can use this information if you wish.
+    //------------------------------------------------------------pod_allocator
+    template<class T> struct pod_allocator
+    {
+        static T*   allocate(unsigned num)       { return new T [num]; }
+        static void deallocate(T* ptr, unsigned) { delete [] ptr;      }
+    };
+
+    // Single object allocator. It's also can be replaced with your custom
+    // allocator. The difference is that it can only allocate a single 
+    // object and the constructor and destructor must be called. 
+    // In AGG there is no need to allocate an array of objects with
+    // calling their constructors (only single ones). So that, if you
+    // replace these new/delete to malloc/free make sure that the in-place
+    // new is called and take care of calling the destructor too.
+    //------------------------------------------------------------obj_allocator
+    template<class T> struct obj_allocator
+    {
+        static T*   allocate()         { return new T; }
+        static void deallocate(T* ptr) { delete ptr;   }
+    };
+}
+#endif
+
+
+//-------------------------------------------------------- Default basic types
+//
+// If the compiler has different capacity of the basic types you can redefine
+// them via the compiler command line or by generating agg_config.h that is
+// empty by default.
+//
+#ifndef AGG_INT8
+#define AGG_INT8 signed char
+#endif
+
+#ifndef AGG_INT8U
+#define AGG_INT8U unsigned char
+#endif
+
+#ifndef AGG_INT16
+#define AGG_INT16 short
+#endif
+
+#ifndef AGG_INT16U
+#define AGG_INT16U unsigned short
+#endif
+
+#ifndef AGG_INT32
+#define AGG_INT32 int
+#endif
+
+#ifndef AGG_INT32U
+#define AGG_INT32U unsigned
+#endif
+
+#ifndef AGG_INT64
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define AGG_INT64 signed __int64
+#else
+#define AGG_INT64 signed long long
+#endif
+#endif
+
+#ifndef AGG_INT64U
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define AGG_INT64U unsigned __int64
+#else
+#define AGG_INT64U unsigned long long
+#endif
+#endif
+
+//------------------------------------------------ Some fixes for MS Visual C++
+#if defined(_MSC_VER)
+#pragma warning(disable:4786) // Identifier was truncated...
+#endif
+
+#if defined(_MSC_VER)
+#define AGG_INLINE __forceinline
+#else
+#define AGG_INLINE inline
+#endif
+
+namespace agg
+{
+    //-------------------------------------------------------------------------
+    typedef AGG_INT8   int8;         //----int8
+    typedef AGG_INT8U  int8u;        //----int8u
+    typedef AGG_INT16  int16;        //----int16
+    typedef AGG_INT16U int16u;       //----int16u
+    typedef AGG_INT32  int32;        //----int32
+    typedef AGG_INT32U int32u;       //----int32u
+    typedef AGG_INT64  int64;        //----int64
+    typedef AGG_INT64U int64u;       //----int64u
+
+#if defined(AGG_FISTP)
+#pragma warning(push)
+#pragma warning(disable : 4035) //Disable warning "no return value"
+    AGG_INLINE int iround(double v)              //-------iround
+    {
+        int t;
+        __asm fld   qword ptr [v]
+        __asm fistp dword ptr [t]
+        __asm mov eax, dword ptr [t]
+    }
+    AGG_INLINE unsigned uround(double v)         //-------uround
+    {
+        unsigned t;
+        __asm fld   qword ptr [v]
+        __asm fistp dword ptr [t]
+        __asm mov eax, dword ptr [t]
+    }
+#pragma warning(pop)
+    AGG_INLINE int ifloor(double v)
+    {
+        return int(floor(v));
+    }
+    AGG_INLINE unsigned ufloor(double v)         //-------ufloor
+    {
+        return unsigned(floor(v));
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)          //--------uceil
+    {
+        return unsigned(ceil(v));
+    }
+#elif defined(AGG_QIFIST)
+    AGG_INLINE int iround(double v)
+    {
+        return int(v);
+    }
+    AGG_INLINE int uround(double v)
+    {
+        return unsigned(v);
+    }
+    AGG_INLINE int ifloor(double v)
+    {
+        return int(std::floor(v));
+    }
+    AGG_INLINE unsigned ufloor(double v)
+    {
+        return unsigned(std::floor(v));
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(std::ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)
+    {
+        return unsigned(std::ceil(v));
+    }
+#else
+    AGG_INLINE int iround(double v)
+    {
+        return int((v < 0.0) ? v - 0.5 : v + 0.5);
+    }
+    AGG_INLINE int uround(double v)
+    {
+        return unsigned(v + 0.5);
+    }
+    AGG_INLINE int ifloor(double v)
+    {
+        int i = int(v);
+        return i - (i > v);
+    }
+    AGG_INLINE unsigned ufloor(double v)
+    {
+        return unsigned(v);
+    }
+    AGG_INLINE int iceil(double v)
+    {
+        return int(std::ceil(v));
+    }
+    AGG_INLINE unsigned uceil(double v)
+    {
+        return unsigned(std::ceil(v));
+    }
+#endif
+
+    //---------------------------------------------------------------saturation
+    template<int Limit> struct saturation
+    {
+        AGG_INLINE static int iround(double v)
+        {
+            if(v < double(-Limit)) return -Limit;
+            if(v > double( Limit)) return  Limit;
+            return agg::iround(v);
+        }
+    };
+
+    //------------------------------------------------------------------mul_one
+    template<unsigned Shift> struct mul_one
+    {
+        AGG_INLINE static unsigned mul(unsigned a, unsigned b)
+        {
+            unsigned q = a * b + (1 << (Shift-1));
+            return (q + (q >> Shift)) >> Shift;
+        }
+    };
+
+    //-------------------------------------------------------------------------
+    typedef unsigned char cover_type;    //----cover_type
+    enum cover_scale_e
+    {
+        cover_shift = 8,                 //----cover_shift
+        cover_size  = 1 << cover_shift,  //----cover_size 
+        cover_mask  = cover_size - 1,    //----cover_mask 
+        cover_none  = 0,                 //----cover_none 
+        cover_full  = cover_mask         //----cover_full 
+    };
+
+    //----------------------------------------------------poly_subpixel_scale_e
+    // These constants determine the subpixel accuracy, to be more precise, 
+    // the number of bits of the fractional part of the coordinates. 
+    // The possible coordinate capacity in bits can be calculated by formula:
+    // sizeof(int) * 8 - poly_subpixel_shift, i.e, for 32-bit integers and
+    // 8-bits fractional part the capacity is 24 bits.
+    enum poly_subpixel_scale_e
+    {
+        poly_subpixel_shift = 8,                      //----poly_subpixel_shift
+        poly_subpixel_scale = 1<<poly_subpixel_shift, //----poly_subpixel_scale 
+        poly_subpixel_mask  = poly_subpixel_scale-1   //----poly_subpixel_mask 
+    };
+
+    //----------------------------------------------------------filling_rule_e
+    enum filling_rule_e
+    {
+        fill_non_zero,
+        fill_even_odd
+    };
+
+    //-----------------------------------------------------------------------pi
+    const double pi = 3.14159265358979323846;
+
+    //------------------------------------------------------------------deg2rad
+    inline double deg2rad(double deg)
+    {
+        return deg * pi / 180.0;
+    }
+
+    //------------------------------------------------------------------rad2deg
+    inline double rad2deg(double rad)
+    {
+        return rad * 180.0 / pi;
+    }
+ 
+    //----------------------------------------------------------------rect_base
+    template<class T> struct rect_base
+    {
+        typedef T            value_type;
+        typedef rect_base<T> self_type;
+        T x1, y1, x2, y2;
+
+        rect_base() {}
+        rect_base(T x1_, T y1_, T x2_, T y2_) :
+            x1(x1_), y1(y1_), x2(x2_), y2(y2_) {}
+
+        void init(T x1_, T y1_, T x2_, T y2_) 
+        {
+            x1 = x1_; y1 = y1_; x2 = x2_; y2 = y2_; 
+        }
+
+        const self_type& normalize()
+        {
+            T t;
+            if(x1 > x2) { t = x1; x1 = x2; x2 = t; }
+            if(y1 > y2) { t = y1; y1 = y2; y2 = t; }
+            return *this;
+        }
+
+        bool clip(const self_type& r)
+        {
+            if(x2 > r.x2) x2 = r.x2;
+            if(y2 > r.y2) y2 = r.y2;
+            if(x1 < r.x1) x1 = r.x1;
+            if(y1 < r.y1) y1 = r.y1;
+            return x1 <= x2 && y1 <= y2;
+        }
+
+        bool is_valid() const
+        {
+            return x1 <= x2 && y1 <= y2;
+        }
+
+        bool hit_test(T x, T y) const
+        {
+            return (x >= x1 && x <= x2 && y >= y1 && y <= y2);
+        }
+        
+        bool overlaps(const self_type& r) const
+        {
+            return !(r.x1 > x2 || r.x2 < x1
+                  || r.y1 > y2 || r.y2 < y1);
+        }
+    };
+
+    //-----------------------------------------------------intersect_rectangles
+    template<class Rect> 
+    inline Rect intersect_rectangles(const Rect& r1, const Rect& r2)
+    {
+        Rect r = r1;
+
+        // First process x2,y2 because the other order 
+        // results in Internal Compiler Error under 
+        // Microsoft Visual C++ .NET 2003 69462-335-0000007-18038 in 
+        // case of "Maximize Speed" optimization option.
+        //-----------------
+        if(r.x2 > r2.x2) r.x2 = r2.x2; 
+        if(r.y2 > r2.y2) r.y2 = r2.y2;
+        if(r.x1 < r2.x1) r.x1 = r2.x1;
+        if(r.y1 < r2.y1) r.y1 = r2.y1;
+        return r;
+    }
+
+
+    //---------------------------------------------------------unite_rectangles
+    template<class Rect> 
+    inline Rect unite_rectangles(const Rect& r1, const Rect& r2)
+    {
+        Rect r = r1;
+        if(r.x2 < r2.x2) r.x2 = r2.x2;
+        if(r.y2 < r2.y2) r.y2 = r2.y2;
+        if(r.x1 > r2.x1) r.x1 = r2.x1;
+        if(r.y1 > r2.y1) r.y1 = r2.y1;
+        return r;
+    }
+
+    typedef rect_base<int>    rect_i; //----rect_i
+    typedef rect_base<float>  rect_f; //----rect_f
+    typedef rect_base<double> rect_d; //----rect_d
+
+    //---------------------------------------------------------path_commands_e
+    enum path_commands_e
+    {
+        path_cmd_stop     = 0,        //----path_cmd_stop    
+        path_cmd_move_to  = 1,        //----path_cmd_move_to 
+        path_cmd_line_to  = 2,        //----path_cmd_line_to 
+        path_cmd_curve3   = 3,        //----path_cmd_curve3  
+        path_cmd_curve4   = 4,        //----path_cmd_curve4  
+        path_cmd_curveN   = 5,        //----path_cmd_curveN
+        path_cmd_catrom   = 6,        //----path_cmd_catrom
+        path_cmd_ubspline = 7,        //----path_cmd_ubspline
+        path_cmd_end_poly = 0x0F,     //----path_cmd_end_poly
+        path_cmd_mask     = 0x0F      //----path_cmd_mask    
+    };
+
+    //------------------------------------------------------------path_flags_e
+    enum path_flags_e
+    {
+        path_flags_none  = 0,         //----path_flags_none 
+        path_flags_ccw   = 0x10,      //----path_flags_ccw  
+        path_flags_cw    = 0x20,      //----path_flags_cw   
+        path_flags_close = 0x40,      //----path_flags_close
+        path_flags_mask  = 0xF0       //----path_flags_mask 
+    };
+
+    //---------------------------------------------------------------is_vertex
+    inline bool is_vertex(unsigned c)
+    {
+        return c >= path_cmd_move_to && c < path_cmd_end_poly;
+    }
+
+    //--------------------------------------------------------------is_drawing
+    inline bool is_drawing(unsigned c)
+    {
+        return c >= path_cmd_line_to && c < path_cmd_end_poly;
+    }
+
+    //-----------------------------------------------------------------is_stop
+    inline bool is_stop(unsigned c)
+    { 
+        return c == path_cmd_stop;
+    }
+
+    //--------------------------------------------------------------is_move_to
+    inline bool is_move_to(unsigned c)
+    {
+        return c == path_cmd_move_to;
+    }
+
+    //--------------------------------------------------------------is_line_to
+    inline bool is_line_to(unsigned c)
+    {
+        return c == path_cmd_line_to;
+    }
+
+    //----------------------------------------------------------------is_curve
+    inline bool is_curve(unsigned c)
+    {
+        return c == path_cmd_curve3 || c == path_cmd_curve4;
+    }
+
+    //---------------------------------------------------------------is_curve3
+    inline bool is_curve3(unsigned c)
+    {
+        return c == path_cmd_curve3;
+    }
+
+    //---------------------------------------------------------------is_curve4
+    inline bool is_curve4(unsigned c)
+    {
+        return c == path_cmd_curve4;
+    }
+
+    //-------------------------------------------------------------is_end_poly
+    inline bool is_end_poly(unsigned c)
+    {
+        return (c & path_cmd_mask) == path_cmd_end_poly;
+    }
+
+    //----------------------------------------------------------------is_close
+    inline bool is_close(unsigned c)
+    {
+        return (c & ~(path_flags_cw | path_flags_ccw)) ==
+               (path_cmd_end_poly | path_flags_close); 
+    }
+
+    //------------------------------------------------------------is_next_poly
+    inline bool is_next_poly(unsigned c)
+    {
+        return is_stop(c) || is_move_to(c) || is_end_poly(c);
+    }
+
+    //-------------------------------------------------------------------is_cw
+    inline bool is_cw(unsigned c)
+    {
+        return (c & path_flags_cw) != 0;
+    }
+
+    //------------------------------------------------------------------is_ccw
+    inline bool is_ccw(unsigned c)
+    {
+        return (c & path_flags_ccw) != 0;
+    }
+
+    //-------------------------------------------------------------is_oriented
+    inline bool is_oriented(unsigned c)
+    {
+        return (c & (path_flags_cw | path_flags_ccw)) != 0; 
+    }
+
+    //---------------------------------------------------------------is_closed
+    inline bool is_closed(unsigned c)
+    {
+        return (c & path_flags_close) != 0; 
+    }
+
+    //----------------------------------------------------------get_close_flag
+    inline unsigned get_close_flag(unsigned c)
+    {
+        return c & path_flags_close; 
+    }
+
+    //-------------------------------------------------------clear_orientation
+    inline unsigned clear_orientation(unsigned c)
+    {
+        return c & ~(path_flags_cw | path_flags_ccw);
+    }
+
+    //---------------------------------------------------------get_orientation
+    inline unsigned get_orientation(unsigned c)
+    {
+        return c & (path_flags_cw | path_flags_ccw);
+    }
+
+    //---------------------------------------------------------set_orientation
+    inline unsigned set_orientation(unsigned c, unsigned o)
+    {
+        return clear_orientation(c) | o;
+    }
+
+    //--------------------------------------------------------------point_base
+    template<class T> struct point_base
+    {
+        typedef T value_type;
+        T x,y;
+        point_base() {}
+        point_base(T x_, T y_) : x(x_), y(y_) {}
+    };
+    typedef point_base<int>    point_i; //-----point_i
+    typedef point_base<float>  point_f; //-----point_f
+    typedef point_base<double> point_d; //-----point_d
+
+    //-------------------------------------------------------------vertex_base
+    template<class T> struct vertex_base
+    {
+        typedef T value_type;
+        T x,y;
+        unsigned cmd;
+        vertex_base() {}
+        vertex_base(T x_, T y_, unsigned cmd_) : x(x_), y(y_), cmd(cmd_) {}
+    };
+    typedef vertex_base<int>    vertex_i; //-----vertex_i
+    typedef vertex_base<float>  vertex_f; //-----vertex_f
+    typedef vertex_base<double> vertex_d; //-----vertex_d
+
+    //----------------------------------------------------------------row_info
+    template<class T> struct row_info
+    {
+        int x1, x2;
+        T* ptr;
+        row_info() {}
+        row_info(int x1_, int x2_, T* ptr_) : x1(x1_), x2(x2_), ptr(ptr_) {}
+    };
+
+    //----------------------------------------------------------const_row_info
+    template<class T> struct const_row_info
+    {
+        int x1, x2;
+        const T* ptr;
+        const_row_info() {}
+        const_row_info(int x1_, int x2_, const T* ptr_) : 
+            x1(x1_), x2(x2_), ptr(ptr_) {}
+    };
+
+    //------------------------------------------------------------is_equal_eps
+    template<class T> inline bool is_equal_eps(T v1, T v2, T epsilon)
+    {
+	bool neg1 = v1 < 0.0;
+	bool neg2 = v2 < 0.0;
+
+	if (neg1 != neg2)
+	    return std::fabs(v1) < epsilon && std::fabs(v2) < epsilon;
+
+        int int1, int2;
+	std::frexp(v1, &int1);
+	std::frexp(v2, &int2);
+	int min12 = int1 < int2 ? int1 : int2;
+
+	v1 = std::ldexp(v1, -min12);
+	v2 = std::ldexp(v2, -min12);
+
+	return std::fabs(v1 - v2) < epsilon;
+    }
+}
+
+
+#endif
+
--- a/dep/agg/include/agg_bezier_arc.h
+++ b/dep/agg/include/agg_bezier_arc.h
@@ -0,0 +1,159 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Arc generator. Produces at most 4 consecutive cubic bezier curves, i.e., 
+// 4, 7, 10, or 13 vertices.
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_BEZIER_ARC_INCLUDED
+#define AGG_BEZIER_ARC_INCLUDED
+
+#include "agg_conv_transform.h"
+
+namespace agg
+{
+
+    //-----------------------------------------------------------------------
+    void arc_to_bezier(double cx, double cy, double rx, double ry, 
+                       double start_angle, double sweep_angle,
+                       double* curve);
+
+
+    //==============================================================bezier_arc
+    // 
+    // See implemantaion agg_bezier_arc.cpp
+    //
+    class bezier_arc
+    {
+    public:
+        //--------------------------------------------------------------------
+        bezier_arc() : m_vertex(26), m_num_vertices(0), m_cmd(path_cmd_line_to) {}
+        bezier_arc(double x,  double y, 
+                   double rx, double ry, 
+                   double start_angle, 
+                   double sweep_angle)
+        {
+            init(x, y, rx, ry, start_angle, sweep_angle);
+        }
+
+        //--------------------------------------------------------------------
+        void init(double x,  double y, 
+                  double rx, double ry, 
+                  double start_angle, 
+                  double sweep_angle);
+
+        //--------------------------------------------------------------------
+        void rewind(unsigned)
+        {
+            m_vertex = 0;
+        }
+
+        //--------------------------------------------------------------------
+        unsigned vertex(double* x, double* y)
+        {
+            if(m_vertex >= m_num_vertices) return path_cmd_stop;
+            *x = m_vertices[m_vertex];
+            *y = m_vertices[m_vertex + 1];
+            m_vertex += 2;
+            return (m_vertex == 2) ? unsigned(path_cmd_move_to) : m_cmd;
+        }
+
+        // Supplemantary functions. num_vertices() actually returns doubled 
+        // number of vertices. That is, for 1 vertex it returns 2.
+        //--------------------------------------------------------------------
+        unsigned  num_vertices() const { return m_num_vertices; }
+        const double* vertices() const { return m_vertices;     }
+        double*       vertices()       { return m_vertices;     }
+ 
+    private:
+        unsigned m_vertex;
+        unsigned m_num_vertices;
+        double   m_vertices[26];
+        unsigned m_cmd;
+    };
+
+
+
+    //==========================================================bezier_arc_svg
+    // Compute an SVG-style bezier arc. 
+    //
+    // Computes an elliptical arc from (x1, y1) to (x2, y2). The size and 
+    // orientation of the ellipse are defined by two radii (rx, ry) 
+    // and an x-axis-rotation, which indicates how the ellipse as a whole 
+    // is rotated relative to the current coordinate system. The center 
+    // (cx, cy) of the ellipse is calculated automatically to satisfy the 
+    // constraints imposed by the other parameters. 
+    // large-arc-flag and sweep-flag contribute to the automatic calculations 
+    // and help determine how the arc is drawn.
+    class bezier_arc_svg
+    {
+    public:
+        //--------------------------------------------------------------------
+        bezier_arc_svg() : m_arc(), m_radii_ok(false) {}
+
+        bezier_arc_svg(double x1, double y1, 
+                       double rx, double ry, 
+                       double angle,
+                       bool large_arc_flag,
+                       bool sweep_flag,
+                       double x2, double y2) : 
+            m_arc(), m_radii_ok(false)
+        {
+            init(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2);
+        }
+
+        //--------------------------------------------------------------------
+        void init(double x1, double y1, 
+                  double rx, double ry, 
+                  double angle,
+                  bool large_arc_flag,
+                  bool sweep_flag,
+                  double x2, double y2);
+
+        //--------------------------------------------------------------------
+        bool radii_ok() const { return m_radii_ok; }
+
+        //--------------------------------------------------------------------
+        void rewind(unsigned)
+        {
+            m_arc.rewind(0);
+        }
+
+        //--------------------------------------------------------------------
+        unsigned vertex(double* x, double* y)
+        {
+            return m_arc.vertex(x, y);
+        }
+
+        // Supplemantary functions. num_vertices() actually returns doubled 
+        // number of vertices. That is, for 1 vertex it returns 2.
+        //--------------------------------------------------------------------
+        unsigned  num_vertices() const { return m_arc.num_vertices(); }
+        const double* vertices() const { return m_arc.vertices();     }
+        double*       vertices()       { return m_arc.vertices();     }
+
+    private:
+        bezier_arc m_arc;
+        bool       m_radii_ok;
+    };
+
+
+
+
+}
+
+
+#endif
--- a/dep/agg/include/agg_bitset_iterator.h
+++ b/dep/agg/include/agg_bitset_iterator.h
@@ -0,0 +1,54 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_BITSET_ITERATOR_INCLUDED
+#define AGG_BITSET_ITERATOR_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    
+    class bitset_iterator
+    {
+    public:
+        bitset_iterator(const int8u* bits, unsigned offset = 0) :
+            m_bits(bits + (offset >> 3)),
+            m_mask(0x80 >> (offset & 7))
+        {}
+
+        void operator ++ ()
+        {
+            m_mask >>= 1;
+            if(m_mask == 0)
+            {
+                ++m_bits;
+                m_mask = 0x80;
+            }
+        }
+
+        unsigned bit() const
+        {
+            return (*m_bits) & m_mask;
+        }
+
+    private:
+        const int8u* m_bits;
+        int8u        m_mask;
+    };
+
+}
+
+#endif
--- a/dep/agg/include/agg_blur.h
+++ b/dep/agg/include/agg_blur.h
--- a/dep/agg/include/agg_bounding_rect.h
+++ b/dep/agg/include/agg_bounding_rect.h
@@ -0,0 +1,116 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// bounding_rect function template
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_BOUNDING_RECT_INCLUDED
+#define AGG_BOUNDING_RECT_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //-----------------------------------------------------------bounding_rect
+    template<class VertexSource, class GetId, class CoordT>
+    bool bounding_rect(VertexSource& vs, GetId& gi, 
+                       unsigned start, unsigned num, 
+                       CoordT* x1, CoordT* y1, CoordT* x2, CoordT* y2)
+    {
+        unsigned i;
+        double x;
+        double y;
+        bool first = true;
+
+        *x1 = CoordT(1);
+        *y1 = CoordT(1);
+        *x2 = CoordT(0);
+        *y2 = CoordT(0);
+
+        for(i = 0; i < num; i++)
+        {
+            vs.rewind(gi[start + i]);
+            unsigned cmd;
+            while(!is_stop(cmd = vs.vertex(&x, &y)))
+            {
+                if(is_vertex(cmd))
+                {
+                    if(first)
+                    {
+                        *x1 = CoordT(x);
+                        *y1 = CoordT(y);
+                        *x2 = CoordT(x);
+                        *y2 = CoordT(y);
+                        first = false;
+                    }
+                    else
+                    {
+                        if(CoordT(x) < *x1) *x1 = CoordT(x);
+                        if(CoordT(y) < *y1) *y1 = CoordT(y);
+                        if(CoordT(x) > *x2) *x2 = CoordT(x);
+                        if(CoordT(y) > *y2) *y2 = CoordT(y);
+                    }
+                }
+            }
+        }
+        return *x1 <= *x2 && *y1 <= *y2;
+    }
+
+
+    //-----------------------------------------------------bounding_rect_single
+    template<class VertexSource, class CoordT> 
+    bool bounding_rect_single(VertexSource& vs, unsigned path_id,
+                              CoordT* x1, CoordT* y1, CoordT* x2, CoordT* y2)
+    {
+        double x;
+        double y;
+        bool first = true;
+
+        *x1 = CoordT(1);
+        *y1 = CoordT(1);
+        *x2 = CoordT(0);
+        *y2 = CoordT(0);
+
+        vs.rewind(path_id);
+        unsigned cmd;
+        while(!is_stop(cmd = vs.vertex(&x, &y)))
+        {
+            if(is_vertex(cmd))
+            {
+                if(first)
+                {
+                    *x1 = CoordT(x);
+                    *y1 = CoordT(y);
+                    *x2 = CoordT(x);
+                    *y2 = CoordT(y);
+                    first = false;
+                }
+                else
+                {
+                    if(CoordT(x) < *x1) *x1 = CoordT(x);
+                    if(CoordT(y) < *y1) *y1 = CoordT(y);
+                    if(CoordT(x) > *x2) *x2 = CoordT(x);
+                    if(CoordT(y) > *y2) *y2 = CoordT(y);
+                }
+            }
+        }
+        return *x1 <= *x2 && *y1 <= *y2;
+    }
+
+
+}
+
+#endif
--- a/dep/agg/include/agg_bspline.h
+++ b/dep/agg/include/agg_bspline.h
@@ -0,0 +1,76 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// class bspline
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_BSPLINE_INCLUDED
+#define AGG_BSPLINE_INCLUDED
+
+#include "agg_array.h"
+
+namespace agg
+{
+    //----------------------------------------------------------------bspline
+    // A very simple class of Bi-cubic Spline interpolation.
+    // First call init(num, x[], y[]) where num - number of source points, 
+    // x, y - arrays of X and Y values respectively. Here Y must be a function 
+    // of X. It means that all the X-coordinates must be arranged in the ascending
+    // order. 
+    // Then call get(x) that calculates a value Y for the respective X. 
+    // The class supports extrapolation, i.e. you can call get(x) where x is
+    // outside the given with init() X-range. Extrapolation is a simple linear 
+    // function.
+    //
+    //  See Implementation agg_bspline.cpp
+    //------------------------------------------------------------------------
+    class bspline 
+    {
+    public:
+        bspline();
+        bspline(int num);
+        bspline(int num, const double* x, const double* y);
+
+        void   init(int num);
+        void   add_point(double x, double y);
+        void   prepare();
+
+        void   init(int num, const double* x, const double* y);
+
+        double get(double x) const;
+        double get_stateful(double x) const;
+    
+    private:
+        bspline(const bspline&);
+        const bspline& operator = (const bspline&);
+
+        static void bsearch(int n, const double *x, double x0, int *i);
+        double extrapolation_left(double x) const;
+        double extrapolation_right(double x) const;
+        double interpolation(double x, int i) const;
+
+        int               m_max;
+        int               m_num;
+        double*           m_x;
+        double*           m_y;
+        pod_array<double> m_am;
+        mutable int       m_last_idx;
+    };
+
+
+}
+
+#endif
--- a/dep/agg/include/agg_clip_liang_barsky.h
+++ b/dep/agg/include/agg_clip_liang_barsky.h
@@ -0,0 +1,333 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Liang-Barsky clipping 
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CLIP_LIANG_BARSKY_INCLUDED
+#define AGG_CLIP_LIANG_BARSKY_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //------------------------------------------------------------------------
+    enum clipping_flags_e
+    {
+        clipping_flags_x1_clipped = 4,
+        clipping_flags_x2_clipped = 1,
+        clipping_flags_y1_clipped = 8,
+        clipping_flags_y2_clipped = 2,
+        clipping_flags_x_clipped = clipping_flags_x1_clipped | clipping_flags_x2_clipped,
+        clipping_flags_y_clipped = clipping_flags_y1_clipped | clipping_flags_y2_clipped
+    };
+
+    //----------------------------------------------------------clipping_flags
+    // Determine the clipping code of the vertex according to the 
+    // Cyrus-Beck line clipping algorithm
+    //
+    //        |        |
+    //  0110  |  0010  | 0011
+    //        |        |
+    // -------+--------+-------- clip_box.y2
+    //        |        |
+    //  0100  |  0000  | 0001
+    //        |        |
+    // -------+--------+-------- clip_box.y1
+    //        |        |
+    //  1100  |  1000  | 1001
+    //        |        |
+    //  clip_box.x1  clip_box.x2
+    //
+    // 
+    template<class T>
+    inline unsigned clipping_flags(T x, T y, const rect_base<T>& clip_box)
+    {
+        return  (x > clip_box.x2) |
+               ((y > clip_box.y2) << 1) |
+               ((x < clip_box.x1) << 2) |
+               ((y < clip_box.y1) << 3);
+    }
+
+    //--------------------------------------------------------clipping_flags_x
+    template<class T>
+    inline unsigned clipping_flags_x(T x, const rect_base<T>& clip_box)
+    {
+        return  (x > clip_box.x2) | ((x < clip_box.x1) << 2);
+    }
+
+
+    //--------------------------------------------------------clipping_flags_y
+    template<class T>
+    inline unsigned clipping_flags_y(T y, const rect_base<T>& clip_box)
+    {
+        return ((y > clip_box.y2) << 1) | ((y < clip_box.y1) << 3);
+    }
+
+
+    //-------------------------------------------------------clip_liang_barsky
+    template<class T>
+    inline unsigned clip_liang_barsky(T x1, T y1, T x2, T y2,
+                                      const rect_base<T>& clip_box,
+                                      T* x, T* y)
+    {
+        const double nearzero = 1e-30;
+
+        double deltax = x2 - x1;
+        double deltay = y2 - y1; 
+        double xin;
+        double xout;
+        double yin;
+        double yout;
+        double tinx;
+        double tiny;
+        double toutx;
+        double touty;  
+        double tin1;
+        double tin2;
+        double tout1;
+        unsigned np = 0;
+
+        if(deltax == 0.0) 
+        {   
+            // bump off of the vertical
+            deltax = (x1 > clip_box.x1) ? -nearzero : nearzero;
+        }
+
+        if(deltay == 0.0) 
+        { 
+            // bump off of the horizontal 
+            deltay = (y1 > clip_box.y1) ? -nearzero : nearzero;
+        }
+        
+        if(deltax > 0.0) 
+        {                
+            // points to right
+            xin  = clip_box.x1;
+            xout = clip_box.x2;
+        }
+        else 
+        {
+            xin  = clip_box.x2;
+            xout = clip_box.x1;
+        }
+
+        if(deltay > 0.0) 
+        {
+            // points up
+            yin  = clip_box.y1;
+            yout = clip_box.y2;
+        }
+        else 
+        {
+            yin  = clip_box.y2;
+            yout = clip_box.y1;
+        }
+        
+        tinx = (xin - x1) / deltax;
+        tiny = (yin - y1) / deltay;
+        
+        if (tinx < tiny) 
+        {
+            // hits x first
+            tin1 = tinx;
+            tin2 = tiny;
+        }
+        else
+        {
+            // hits y first
+            tin1 = tiny;
+            tin2 = tinx;
+        }
+        
+        if(tin1 <= 1.0) 
+        {
+            if(0.0 < tin1) 
+            {
+                *x++ = (T)xin;
+                *y++ = (T)yin;
+                ++np;
+            }
+
+            if(tin2 <= 1.0)
+            {
+                toutx = (xout - x1) / deltax;
+                touty = (yout - y1) / deltay;
+                
+                tout1 = (toutx < touty) ? toutx : touty;
+                
+                if(tin2 > 0.0 || tout1 > 0.0) 
+                {
+                    if(tin2 <= tout1) 
+                    {
+                        if(tin2 > 0.0) 
+                        {
+                            if(tinx > tiny) 
+                            {
+                                *x++ = (T)xin;
+                                *y++ = (T)(y1 + tinx * deltay);
+                            }
+                            else 
+                            {
+                                *x++ = (T)(x1 + tiny * deltax);
+                                *y++ = (T)yin;
+                            }
+                            ++np;
+                        }
+
+                        if(tout1 < 1.0) 
+                        {
+                            if(toutx < touty) 
+                            {
+                                *x++ = (T)xout;
+                                *y++ = (T)(y1 + toutx * deltay);
+                            }
+                            else 
+                            {
+                                *x++ = (T)(x1 + touty * deltax);
+                                *y++ = (T)yout;
+                            }
+                        }
+                        else 
+                        {
+                            *x++ = x2;
+                            *y++ = y2;
+                        }
+                        ++np;
+                    }
+                    else 
+                    {
+                        if(tinx > tiny) 
+                        {
+                            *x++ = (T)xin;
+                            *y++ = (T)yout;
+                        }
+                        else 
+                        {
+                            *x++ = (T)xout;
+                            *y++ = (T)yin;
+                        }
+                        ++np;
+                    }
+                }
+            }
+        }
+        return np;
+    }
+
+
+    //----------------------------------------------------------------------------
+    template<class T>
+    bool clip_move_point(T x1, T y1, T x2, T y2, 
+                         const rect_base<T>& clip_box, 
+                         T* x, T* y, unsigned flags)
+    {
+       T bound;
+
+       if(flags & clipping_flags_x_clipped)
+       {
+           if(x1 == x2)
+           {
+               return false;
+           }
+           bound = (flags & clipping_flags_x1_clipped) ? clip_box.x1 : clip_box.x2;
+           *y = (T)(double(bound - x1) * (y2 - y1) / (x2 - x1) + y1);
+           *x = bound;
+       }
+
+       flags = clipping_flags_y(*y, clip_box);
+       if(flags & clipping_flags_y_clipped)
+       {
+           if(y1 == y2)
+           {
+               return false;
+           }
+           bound = (flags & clipping_flags_y1_clipped) ? clip_box.y1 : clip_box.y2;
+           *x = (T)(double(bound - y1) * (x2 - x1) / (y2 - y1) + x1);
+           *y = bound;
+       }
+       return true;
+    }
+
+    //-------------------------------------------------------clip_line_segment
+    // Returns: ret >= 4        - Fully clipped
+    //          (ret & 1) != 0  - First point has been moved
+    //          (ret & 2) != 0  - Second point has been moved
+    //
+    template<class T>
+    unsigned clip_line_segment(T* x1, T* y1, T* x2, T* y2,
+                               const rect_base<T>& clip_box)
+    {
+        unsigned f1 = clipping_flags(*x1, *y1, clip_box);
+        unsigned f2 = clipping_flags(*x2, *y2, clip_box);
+        unsigned ret = 0;
+
+        if((f2 | f1) == 0)
+        {
+            // Fully visible
+            return 0;
+        }
+
+        if((f1 & clipping_flags_x_clipped) != 0 && 
+           (f1 & clipping_flags_x_clipped) == (f2 & clipping_flags_x_clipped))
+        {
+            // Fully clipped
+            return 4;
+        }
+
+        if((f1 & clipping_flags_y_clipped) != 0 && 
+           (f1 & clipping_flags_y_clipped) == (f2 & clipping_flags_y_clipped))
+        {
+            // Fully clipped
+            return 4;
+        }
+
+        T tx1 = *x1;
+        T ty1 = *y1;
+        T tx2 = *x2;
+        T ty2 = *y2;
+        if(f1) 
+        {   
+            if(!clip_move_point(tx1, ty1, tx2, ty2, clip_box, x1, y1, f1)) 
+            {
+                return 4;
+            }
+            if(*x1 == *x2 && *y1 == *y2) 
+            {
+                return 4;
+            }
+            ret |= 1;
+        }
+        if(f2) 
+        {
+            if(!clip_move_point(tx1, ty1, tx2, ty2, clip_box, x2, y2, f2))
+            {
+                return 4;
+            }
+            if(*x1 == *x2 && *y1 == *y2) 
+            {
+                return 4;
+            }
+            ret |= 2;
+        }
+        return ret;
+    }
+
+
+}
+
+
+#endif
--- a/dep/agg/include/agg_color_gray.h
+++ b/dep/agg/include/agg_color_gray.h
--- a/dep/agg/include/agg_color_rgba.h
+++ b/dep/agg/include/agg_color_rgba.h
--- a/dep/agg/include/agg_config.h
+++ b/dep/agg/include/agg_config.h
@@ -0,0 +1,44 @@
+#ifndef AGG_CONFIG_INCLUDED
+#define AGG_CONFIG_INCLUDED
+
+// This file can be used to redefine certain data types.
+
+//---------------------------------------
+// 1. Default basic types such as:
+// 
+// AGG_INT8
+// AGG_INT8U
+// AGG_INT16
+// AGG_INT16U
+// AGG_INT32
+// AGG_INT32U
+// AGG_INT64
+// AGG_INT64U
+//
+// Just replace this file with new defines if necessary. 
+// For example, if your compiler doesn't have a 64 bit integer type
+// you can still use AGG if you define the follows:
+//
+// #define AGG_INT64  int
+// #define AGG_INT64U unsigned
+//
+// It will result in overflow in 16 bit-per-component image/pattern resampling
+// but it won't result any crash and the rest of the library will remain 
+// fully functional.
+
+
+//---------------------------------------
+// 2. Default rendering_buffer type. Can be:
+//
+// Provides faster access for massive pixel operations, 
+// such as blur, image filtering:
+// #define AGG_RENDERING_BUFFER row_ptr_cache<int8u>
+// 
+// Provides cheaper creation and destruction (no mem allocs):
+// #define AGG_RENDERING_BUFFER row_accessor<int8u>
+//
+// You can still use both of them simultaneously in your applications 
+// This #define is used only for default rendering_buffer type,
+// in short hand typedefs like pixfmt_rgba32.
+
+#endif
--- a/dep/agg/include/agg_conv_adaptor_vcgen.h
+++ b/dep/agg/include/agg_conv_adaptor_vcgen.h
@@ -0,0 +1,157 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    //------------------------------------------------------------null_markers
+    struct null_markers
+    {
+        void remove_all() {}
+        void add_vertex(double, double, unsigned) {}
+        void prepare_src() {}
+
+        void rewind(unsigned) {}
+        unsigned vertex(double*, double*) { return path_cmd_stop; }
+    };
+
+
+    //------------------------------------------------------conv_adaptor_vcgen
+    template<class VertexSource, 
+             class Generator, 
+             class Markers=null_markers> class conv_adaptor_vcgen
+    {
+        enum status
+        {
+            initial,
+            accumulate,
+            generate
+        };
+
+    public:
+        explicit conv_adaptor_vcgen(VertexSource& source) :
+            m_source(&source), 
+            m_status(initial)
+        {}
+        void attach(VertexSource& source) { m_source = &source; }
+
+        Generator& generator() { return m_generator; }
+        const Generator& generator() const { return m_generator; }
+
+        Markers& markers() { return m_markers; }
+        const Markers& markers() const { return m_markers; }
+        
+        void rewind(unsigned path_id) 
+        { 
+            m_source->rewind(path_id); 
+            m_status = initial;
+        }
+
+        unsigned vertex(double* x, double* y);
+
+    private:
+        // Prohibit copying
+        conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+        const conv_adaptor_vcgen<VertexSource, Generator, Markers>& 
+            operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
+
+        VertexSource* m_source;
+        Generator     m_generator;
+        Markers       m_markers;
+        status        m_status;
+        unsigned      m_last_cmd;
+        double        m_start_x;
+        double        m_start_y;
+    };
+
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class Generator, class Markers> 
+    unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(double* x, double* y)
+    {
+        unsigned cmd = path_cmd_stop;
+        bool done = false;
+        while(!done)
+        {
+            switch(m_status)
+            {
+            case initial:
+                m_markers.remove_all();
+                m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
+                m_status = accumulate;
+
+            case accumulate:
+                if(is_stop(m_last_cmd)) return path_cmd_stop;
+
+                m_generator.remove_all();
+                m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+                m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
+
+                for(;;)
+                {
+                    cmd = m_source->vertex(x, y);
+                    if(is_vertex(cmd))
+                    {
+                        m_last_cmd = cmd;
+                        if(is_move_to(cmd))
+                        {
+                            m_start_x = *x;
+                            m_start_y = *y;
+                            break;
+                        }
+                        m_generator.add_vertex(*x, *y, cmd);
+                        m_markers.add_vertex(*x, *y, path_cmd_line_to);
+                    }
+                    else
+                    {
+                        if(is_stop(cmd))
+                        {
+                            m_last_cmd = path_cmd_stop;
+                            break;
+                        }
+                        if(is_end_poly(cmd))
+                        {
+                            m_generator.add_vertex(*x, *y, cmd);
+                            break;
+                        }
+                    }
+                }
+                m_generator.rewind(0);
+                m_status = generate;
+
+            case generate:
+                cmd = m_generator.vertex(x, y);
+                if(is_stop(cmd))
+                {
+                    m_status = accumulate;
+                    break;
+                }
+                done = true;
+                break;
+            }
+        }
+        return cmd;
+    }
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_adaptor_vpgen.h
+++ b/dep/agg/include/agg_conv_adaptor_vpgen.h
@@ -0,0 +1,159 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_ADAPTOR_VPGEN_INCLUDED
+#define AGG_CONV_ADAPTOR_VPGEN_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //======================================================conv_adaptor_vpgen
+    template<class VertexSource, class VPGen> class conv_adaptor_vpgen
+    {
+    public:
+        explicit conv_adaptor_vpgen(VertexSource& source) : m_source(&source) {}
+        void attach(VertexSource& source) { m_source = &source; }
+
+        VPGen& vpgen() { return m_vpgen; }
+        const VPGen& vpgen() const { return m_vpgen; }
+
+        void rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        conv_adaptor_vpgen(const conv_adaptor_vpgen<VertexSource, VPGen>&);
+        const conv_adaptor_vpgen<VertexSource, VPGen>& 
+            operator = (const conv_adaptor_vpgen<VertexSource, VPGen>&);
+
+        VertexSource* m_source;
+        VPGen         m_vpgen;
+        double        m_start_x;
+        double        m_start_y;
+        unsigned      m_poly_flags;
+        int           m_vertices;
+    };
+
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class VPGen>
+    void conv_adaptor_vpgen<VertexSource, VPGen>::rewind(unsigned path_id) 
+    { 
+        m_source->rewind(path_id);
+        m_vpgen.reset();
+        m_start_x    = 0;
+        m_start_y    = 0;
+        m_poly_flags = 0;
+        m_vertices   = 0;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class VPGen>
+    unsigned conv_adaptor_vpgen<VertexSource, VPGen>::vertex(double* x, double* y)
+    {
+        unsigned cmd = path_cmd_stop;
+        for(;;)
+        {
+            cmd = m_vpgen.vertex(x, y);
+            if(!is_stop(cmd)) break;
+
+            if(m_poly_flags && !m_vpgen.auto_unclose())
+            {
+                *x = 0.0;
+                *y = 0.0;
+                cmd = m_poly_flags;
+                m_poly_flags = 0;
+                break;
+            }
+
+            if(m_vertices < 0)
+            {
+                if(m_vertices < -1) 
+                {
+                    m_vertices = 0;
+                    return path_cmd_stop;
+                }
+                m_vpgen.move_to(m_start_x, m_start_y);
+                m_vertices = 1;
+                continue;
+            }
+
+            double tx, ty;
+            cmd = m_source->vertex(&tx, &ty);
+            if(is_vertex(cmd))
+            {
+                if(is_move_to(cmd)) 
+                {
+                    if(m_vpgen.auto_close() && m_vertices > 2)
+                    {
+                        m_vpgen.line_to(m_start_x, m_start_y);
+                        m_poly_flags = path_cmd_end_poly | path_flags_close;
+                        m_start_x    = tx;
+                        m_start_y    = ty;
+                        m_vertices   = -1;
+                        continue;
+                    }
+                    m_vpgen.move_to(tx, ty);
+                    m_start_x  = tx;
+                    m_start_y  = ty;
+                    m_vertices = 1;
+                }
+                else 
+                {
+                    m_vpgen.line_to(tx, ty);
+                    ++m_vertices;
+                }
+            }
+            else
+            {
+                if(is_end_poly(cmd))
+                {
+                    m_poly_flags = cmd;
+                    if(is_closed(cmd) || m_vpgen.auto_close())
+                    {
+                        if(m_vpgen.auto_close()) m_poly_flags |= path_flags_close;
+                        if(m_vertices > 2)
+                        {
+                            m_vpgen.line_to(m_start_x, m_start_y);
+                        }
+                        m_vertices = 0;
+                    }
+                }
+                else
+                {
+                    // path_cmd_stop
+                    if(m_vpgen.auto_close() && m_vertices > 2)
+                    {
+                        m_vpgen.line_to(m_start_x, m_start_y);
+                        m_poly_flags = path_cmd_end_poly | path_flags_close;
+                        m_vertices   = -2;
+                        continue;
+                    }
+                    break;
+                }
+            }
+        }
+        return cmd;
+    }
+
+
+}
+
+
+#endif
+
--- a/dep/agg/include/agg_conv_bspline.h
+++ b/dep/agg/include/agg_conv_bspline.h
@@ -0,0 +1,48 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_BSPLINE_INCLUDED
+#define AGG_CONV_BSPLINE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vcgen_bspline.h"
+#include "agg_conv_adaptor_vcgen.h"
+
+
+namespace agg
+{
+
+    //---------------------------------------------------------conv_bspline
+    template<class VertexSource> 
+    struct conv_bspline : public conv_adaptor_vcgen<VertexSource, vcgen_bspline>
+    {
+        typedef conv_adaptor_vcgen<VertexSource, vcgen_bspline> base_type;
+
+        conv_bspline(VertexSource& vs) : 
+            conv_adaptor_vcgen<VertexSource, vcgen_bspline>(vs) {}
+
+        void   interpolation_step(double v) { base_type::generator().interpolation_step(v); }
+        double interpolation_step() const { return base_type::generator().interpolation_step(); }
+
+    private:
+        conv_bspline(const conv_bspline<VertexSource>&);
+        const conv_bspline<VertexSource>& 
+            operator = (const conv_bspline<VertexSource>&);
+    };
+
+}
+
+
+#endif
+
--- a/dep/agg/include/agg_conv_clip_polygon.h
+++ b/dep/agg/include/agg_conv_clip_polygon.h
@@ -0,0 +1,63 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// Polygon clipping converter
+// There an optimized Liang-Basky algorithm is used. 
+// The algorithm doesn't optimize the degenerate edges, i.e. it will never
+// break a closed polygon into two or more ones, instead, there will be 
+// degenerate edges coinciding with the respective clipping boundaries.
+// This is a sub-optimal solution, because that optimization would require 
+// extra, rather expensive math while the rasterizer tolerates it quite well, 
+// without any considerable overhead.
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_CLIP_POLYGON_INCLUDED
+#define AGG_CONV_CLIP_POLYGON_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_conv_adaptor_vpgen.h"
+#include "agg_vpgen_clip_polygon.h"
+
+namespace agg
+{
+
+    //=======================================================conv_clip_polygon
+    template<class VertexSource> 
+    struct conv_clip_polygon : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>
+    {
+        typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon> base_type;
+
+        conv_clip_polygon(VertexSource& vs) : 
+            conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>(vs) {}
+
+        void clip_box(double x1, double y1, double x2, double y2)
+        {
+            base_type::vpgen().clip_box(x1, y1, x2, y2);
+        }
+
+        double x1() const { return base_type::vpgen().x1(); }
+        double y1() const { return base_type::vpgen().y1(); }
+        double x2() const { return base_type::vpgen().x2(); }
+        double y2() const { return base_type::vpgen().y2(); }
+
+    private:
+        conv_clip_polygon(const conv_clip_polygon<VertexSource>&);
+        const conv_clip_polygon<VertexSource>& 
+            operator = (const conv_clip_polygon<VertexSource>&);
+    };
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_clip_polyline.h
+++ b/dep/agg/include/agg_conv_clip_polyline.h
@@ -0,0 +1,63 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// polyline clipping converter
+// There an optimized Liang-Basky algorithm is used. 
+// The algorithm doesn't optimize the degenerate edges, i.e. it will never
+// break a closed polyline into two or more ones, instead, there will be 
+// degenerate edges coinciding with the respective clipping boundaries.
+// This is a sub-optimal solution, because that optimization would require 
+// extra, rather expensive math while the rasterizer tolerates it quite well, 
+// without any considerable overhead.
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_CLIP_polyline_INCLUDED
+#define AGG_CONV_CLIP_polyline_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_conv_adaptor_vpgen.h"
+#include "agg_vpgen_clip_polyline.h"
+
+namespace agg
+{
+
+    //=======================================================conv_clip_polyline
+    template<class VertexSource> 
+    struct conv_clip_polyline : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>
+    {
+        typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline> base_type;
+
+        conv_clip_polyline(VertexSource& vs) : 
+            conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>(vs) {}
+
+        void clip_box(double x1, double y1, double x2, double y2)
+        {
+            base_type::vpgen().clip_box(x1, y1, x2, y2);
+        }
+
+        double x1() const { return base_type::vpgen().x1(); }
+        double y1() const { return base_type::vpgen().y1(); }
+        double x2() const { return base_type::vpgen().x2(); }
+        double y2() const { return base_type::vpgen().y2(); }
+
+    private:
+        conv_clip_polyline(const conv_clip_polyline<VertexSource>&);
+        const conv_clip_polyline<VertexSource>& 
+            operator = (const conv_clip_polyline<VertexSource>&);
+    };
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_close_polygon.h
+++ b/dep/agg/include/agg_conv_close_polygon.h
@@ -0,0 +1,125 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_CLOSE_POLYGON_INCLUDED
+#define AGG_CONV_CLOSE_POLYGON_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //======================================================conv_close_polygon
+    template<class VertexSource> class conv_close_polygon
+    {
+    public:
+        explicit conv_close_polygon(VertexSource& vs) : m_source(&vs) {}
+        void attach(VertexSource& source) { m_source = &source; }
+
+        void rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        conv_close_polygon(const conv_close_polygon<VertexSource>&);
+        const conv_close_polygon<VertexSource>& 
+            operator = (const conv_close_polygon<VertexSource>&);
+
+        VertexSource* m_source;
+        unsigned      m_cmd[2];
+        double        m_x[2];
+        double        m_y[2];
+        unsigned      m_vertex;
+        bool          m_line_to;
+    };
+
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource> 
+    void conv_close_polygon<VertexSource>::rewind(unsigned path_id)
+    {
+        m_source->rewind(path_id);
+        m_vertex = 2;
+        m_line_to = false;
+    }
+
+
+    
+    //------------------------------------------------------------------------
+    template<class VertexSource> 
+    unsigned conv_close_polygon<VertexSource>::vertex(double* x, double* y)
+    {
+        unsigned cmd = path_cmd_stop;
+        for(;;)
+        {
+            if(m_vertex < 2)
+            {
+                *x = m_x[m_vertex];
+                *y = m_y[m_vertex];
+                cmd = m_cmd[m_vertex];
+                ++m_vertex;
+                break;
+            }
+
+            cmd = m_source->vertex(x, y);
+
+            if(is_end_poly(cmd))
+            {
+                cmd |= path_flags_close;
+                break;
+            }
+
+            if(is_stop(cmd))
+            {
+                if(m_line_to)
+                {
+                    m_cmd[0]  = path_cmd_end_poly | path_flags_close;
+                    m_cmd[1]  = path_cmd_stop;
+                    m_vertex  = 0;
+                    m_line_to = false;
+                    continue;
+                }
+                break;
+            }
+
+            if(is_move_to(cmd))
+            {
+                if(m_line_to)
+                {
+                    m_x[0]    = 0.0;
+                    m_y[0]    = 0.0;
+                    m_cmd[0]  = path_cmd_end_poly | path_flags_close;
+                    m_x[1]    = *x;
+                    m_y[1]    = *y;
+                    m_cmd[1]  = cmd;
+                    m_vertex  = 0;
+                    m_line_to = false;
+                    continue;
+                }
+                break;
+            }
+
+            if(is_vertex(cmd))
+            {
+                m_line_to = true;
+                break;
+            }
+        }
+        return cmd;
+    }
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_concat.h
+++ b/dep/agg/include/agg_conv_concat.h
@@ -0,0 +1,73 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_CONCAT_INCLUDED
+#define AGG_CONV_CONCAT_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    //=============================================================conv_concat
+    // Concatenation of two paths. Usually used to combine lines or curves 
+    // with markers such as arrowheads
+    template<class VS1, class VS2> class conv_concat
+    {
+    public:
+        conv_concat(VS1& source1, VS2& source2) :
+            m_source1(&source1), m_source2(&source2), m_status(2) {}
+        void attach1(VS1& source) { m_source1 = &source; }
+        void attach2(VS2& source) { m_source2 = &source; }
+
+
+        void rewind(unsigned path_id)
+        { 
+            m_source1->rewind(path_id);
+            m_source2->rewind(0);
+            m_status = 0;
+        }
+
+        unsigned vertex(double* x, double* y)
+        {
+            unsigned cmd;
+            if(m_status == 0)
+            {
+                cmd = m_source1->vertex(x, y);
+                if(!is_stop(cmd)) return cmd;
+                m_status = 1;
+            }
+            if(m_status == 1)
+            {
+                cmd = m_source2->vertex(x, y);
+                if(!is_stop(cmd)) return cmd;
+                m_status = 2;
+            }
+            return path_cmd_stop;
+        }
+
+    private:
+        conv_concat(const conv_concat<VS1, VS2>&);
+        const conv_concat<VS1, VS2>& 
+            operator = (const conv_concat<VS1, VS2>&);
+
+        VS1* m_source1;
+        VS2* m_source2;
+        int  m_status;
+
+    };
+}
+
+
+#endif
--- a/dep/agg/include/agg_conv_contour.h
+++ b/dep/agg/include/agg_conv_contour.h
@@ -0,0 +1,65 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// conv_stroke
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_CONTOUR_INCLUDED
+#define AGG_CONV_CONTOUR_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vcgen_contour.h"
+#include "agg_conv_adaptor_vcgen.h"
+
+namespace agg
+{
+
+    //-----------------------------------------------------------conv_contour
+    template<class VertexSource> 
+    struct conv_contour : public conv_adaptor_vcgen<VertexSource, vcgen_contour>
+    {
+        typedef conv_adaptor_vcgen<VertexSource, vcgen_contour> base_type;
+
+        conv_contour(VertexSource& vs) : 
+            conv_adaptor_vcgen<VertexSource, vcgen_contour>(vs)
+        {
+        }
+
+        void line_join(line_join_e lj) { base_type::generator().line_join(lj); }
+        void inner_join(inner_join_e ij) { base_type::generator().inner_join(ij); }
+        void width(double w) { base_type::generator().width(w); }
+        void miter_limit(double ml) { base_type::generator().miter_limit(ml); }
+        void miter_limit_theta(double t) { base_type::generator().miter_limit_theta(t); }
+        void inner_miter_limit(double ml) { base_type::generator().inner_miter_limit(ml); }
+        void approximation_scale(double as) { base_type::generator().approximation_scale(as); }
+        void auto_detect_orientation(bool v) { base_type::generator().auto_detect_orientation(v); }
+
+        line_join_e line_join() const { return base_type::generator().line_join(); }
+        inner_join_e inner_join() const { return base_type::generator().inner_join(); }
+        double width() const { return base_type::generator().width(); }
+        double miter_limit() const { return base_type::generator().miter_limit(); }
+        double inner_miter_limit() const { return base_type::generator().inner_miter_limit(); }
+        double approximation_scale() const { return base_type::generator().approximation_scale(); }
+        bool auto_detect_orientation() const { return base_type::generator().auto_detect_orientation(); }
+
+    private:
+        conv_contour(const conv_contour<VertexSource>&);
+        const conv_contour<VertexSource>& 
+            operator = (const conv_contour<VertexSource>&);
+    };
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_curve.h
+++ b/dep/agg/include/agg_conv_curve.h
@@ -0,0 +1,201 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// classes conv_curve
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_CURVE_INCLUDED
+#define AGG_CONV_CURVE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_curves.h"
+
+namespace agg
+{
+
+
+    //---------------------------------------------------------------conv_curve
+    // Curve converter class. Any path storage can have Bezier curves defined 
+    // by their control points. There're two types of curves supported: curve3 
+    // and curve4. Curve3 is a conic Bezier curve with 2 endpoints and 1 control
+    // point. Curve4 has 2 control points (4 points in total) and can be used
+    // to interpolate more complicated curves. Curve4, unlike curve3 can be used 
+    // to approximate arcs, both circular and elliptical. Curves are approximated 
+    // with straight lines and one of the approaches is just to store the whole 
+    // sequence of vertices that approximate our curve. It takes additional 
+    // memory, and at the same time the consecutive vertices can be calculated 
+    // on demand. 
+    //
+    // Initially, path storages are not suppose to keep all the vertices of the
+    // curves (although, nothing prevents us from doing so). Instead, path_storage
+    // keeps only vertices, needed to calculate a curve on demand. Those vertices
+    // are marked with special commands. So, if the path_storage contains curves 
+    // (which are not real curves yet), and we render this storage directly, 
+    // all we will see is only 2 or 3 straight line segments (for curve3 and 
+    // curve4 respectively). If we need to see real curves drawn we need to 
+    // include this class into the conversion pipeline. 
+    //
+    // Class conv_curve recognizes commands path_cmd_curve3 and path_cmd_curve4 
+    // and converts these vertices into a move_to/line_to sequence. 
+    //-----------------------------------------------------------------------
+    template<class VertexSource, 
+             class Curve3=curve3, 
+             class Curve4=curve4> class conv_curve
+    {
+    public:
+        typedef Curve3 curve3_type;
+        typedef Curve4 curve4_type;
+        typedef conv_curve<VertexSource, Curve3, Curve4> self_type;
+
+        explicit conv_curve(VertexSource& source) :
+          m_source(&source), m_last_x(0.0), m_last_y(0.0) {}
+        void attach(VertexSource& source) { m_source = &source; }
+
+        void approximation_method(curve_approximation_method_e v) 
+        { 
+            m_curve3.approximation_method(v);
+            m_curve4.approximation_method(v);
+        }
+
+        curve_approximation_method_e approximation_method() const 
+        { 
+            return m_curve4.approximation_method();
+        }
+
+        void approximation_scale(double s) 
+        { 
+            m_curve3.approximation_scale(s); 
+            m_curve4.approximation_scale(s); 
+        }
+
+        double approximation_scale() const 
+        { 
+            return m_curve4.approximation_scale();  
+        }
+
+        void angle_tolerance(double v) 
+        { 
+            m_curve3.angle_tolerance(v); 
+            m_curve4.angle_tolerance(v); 
+        }
+
+        double angle_tolerance() const 
+        { 
+            return m_curve4.angle_tolerance();  
+        }
+
+        void cusp_limit(double v) 
+        { 
+            m_curve3.cusp_limit(v); 
+            m_curve4.cusp_limit(v); 
+        }
+
+        double cusp_limit() const 
+        { 
+            return m_curve4.cusp_limit();  
+        }
+
+        void     rewind(unsigned path_id); 
+        unsigned vertex(double* x, double* y);
+
+    private:
+        conv_curve(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        VertexSource* m_source;
+        double        m_last_x;
+        double        m_last_y;
+        curve3_type   m_curve3;
+        curve4_type   m_curve4;
+    };
+
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class Curve3, class Curve4>
+    void conv_curve<VertexSource, Curve3, Curve4>::rewind(unsigned path_id)
+    {
+        m_source->rewind(path_id);
+        m_last_x = 0.0;
+        m_last_y = 0.0;
+        m_curve3.reset();
+        m_curve4.reset();
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VertexSource, class Curve3, class Curve4>
+    unsigned conv_curve<VertexSource, Curve3, Curve4>::vertex(double* x, double* y)
+    {
+        if(!is_stop(m_curve3.vertex(x, y)))
+        {
+            m_last_x = *x;
+            m_last_y = *y;
+            return path_cmd_line_to;
+        }
+
+        if(!is_stop(m_curve4.vertex(x, y)))
+        {
+            m_last_x = *x;
+            m_last_y = *y;
+            return path_cmd_line_to;
+        }
+
+        double ct2_x = 0;
+        double ct2_y = 0;
+        double end_x = 0;
+        double end_y = 0;
+
+        unsigned cmd = m_source->vertex(x, y);
+        switch(cmd)
+        {
+        case path_cmd_curve3:
+            m_source->vertex(&end_x, &end_y);
+
+            m_curve3.init(m_last_x, m_last_y, 
+                          *x,       *y, 
+                          end_x,     end_y);
+
+            m_curve3.vertex(x, y);    // First call returns path_cmd_move_to
+            m_curve3.vertex(x, y);    // This is the first vertex of the curve
+            cmd = path_cmd_line_to;
+            break;
+
+        case path_cmd_curve4:
+            m_source->vertex(&ct2_x, &ct2_y);
+            m_source->vertex(&end_x, &end_y);
+
+            m_curve4.init(m_last_x, m_last_y, 
+                          *x,       *y, 
+                          ct2_x,    ct2_y, 
+                          end_x,    end_y);
+
+            m_curve4.vertex(x, y);    // First call returns path_cmd_move_to
+            m_curve4.vertex(x, y);    // This is the first vertex of the curve
+            cmd = path_cmd_line_to;
+            break;
+        }
+        m_last_x = *x;
+        m_last_y = *y;
+        return cmd;
+    }
+
+
+}
+
+
+
+#endif
--- a/dep/agg/include/agg_conv_dash.h
+++ b/dep/agg/include/agg_conv_dash.h
@@ -0,0 +1,68 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// conv_dash
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_CONV_DASH_INCLUDED
+#define AGG_CONV_DASH_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vcgen_dash.h"
+#include "agg_conv_adaptor_vcgen.h"
+
+namespace agg
+{
+
+    //---------------------------------------------------------------conv_dash
+    template<class VertexSource, class Markers=null_markers> 
+    struct conv_dash : public conv_adaptor_vcgen<VertexSource, vcgen_dash, Markers>
+    {
+        typedef Markers marker_type;
+        typedef conv_adaptor_vcgen<VertexSource, vcgen_dash, Markers> base_type;
+
+        conv_dash(VertexSource& vs) : 
+            conv_adaptor_vcgen<VertexSource, vcgen_dash, Markers>(vs)
+        {
+        }
+
+        void remove_all_dashes() 
+        { 
+            base_type::generator().remove_all_dashes(); 
+        }
+
+        void add_dash(double dash_len, double gap_len) 
+        { 
+            base_type::generator().add_dash(dash_len, gap_len); 
+        }
+
+        void dash_start(double ds) 
+        { 
+            base_type::generator().dash_start(ds); 
+        }
+
+        void shorten(double s) { base_type::generator().shorten(s); }
+        double shorten() const { return base_type::generator().shorten(); }
+
+    private:
+        conv_dash(const conv_dash<VertexSource, Markers>&);
+        const conv_dash<VertexSource, Markers>& 
+            operator = (const conv_dash<VertexSource, Markers>&);
+    };
+
+
+}
+
+#endif
--- a/dep/agg/include/agg_conv_gpc.h
+++ b/dep/agg/include/agg_conv_gpc.h
@@ -0,0 +1,432 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// General Polygon Clipper based on the GPC library by Alan Murta 
+// Union, Intersection, XOR, A-B, B-A
+// Contact the author if you intend to use it in commercial applications!
+// http://www.cs.man.ac.uk/aig/staff/alan/software/
+// Alan Murta (email: gpc@cs.man.ac.uk)
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_GPC_INCLUDED
+#define AGG_CONV_GPC_INCLUDED
+
+#include <cstring>
+#include "agg_basics.h"
+#include "agg_array.h"
+
+extern "C" 
+{ 
+#include "gpc.h" 
+}
+
+namespace agg
+{
+    enum gpc_op_e
+    {
+        gpc_or,
+        gpc_and,
+        gpc_xor,
+        gpc_a_minus_b,
+        gpc_b_minus_a
+    };
+
+
+    //================================================================conv_gpc
+    template<class VSA, class VSB> class conv_gpc
+    {
+        enum status
+        {
+            status_move_to,
+            status_line_to,
+            status_stop
+        };
+
+        struct contour_header_type
+        {
+            int num_vertices;
+            int hole_flag;
+            gpc_vertex* vertices;
+        };
+
+        typedef pod_bvector<gpc_vertex, 8>          vertex_array_type;
+        typedef pod_bvector<contour_header_type, 6> contour_header_array_type;
+
+
+    public:
+        typedef VSA source_a_type;
+        typedef VSB source_b_type;
+        typedef conv_gpc<source_a_type, source_b_type> self_type;
+
+        ~conv_gpc()
+        {
+            free_gpc_data();
+        }
+
+        conv_gpc(source_a_type& a, source_b_type& b, gpc_op_e op = gpc_or) :
+            m_src_a(&a),
+            m_src_b(&b),
+            m_status(status_move_to),
+            m_vertex(-1),
+            m_contour(-1),
+            m_operation(op)
+        {
+            std::memset(&m_poly_a, 0, sizeof(m_poly_a));
+            std::memset(&m_poly_b, 0, sizeof(m_poly_b));
+            std::memset(&m_result, 0, sizeof(m_result));
+        }
+
+        void attach1(VSA& source) { m_src_a = &source; }
+        void attach2(VSB& source) { m_src_b = &source; }
+
+        void operation(gpc_op_e v) { m_operation = v; }
+
+        // Vertex Source Interface
+        void     rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        conv_gpc(const conv_gpc<VSA, VSB>&);
+        const conv_gpc<VSA, VSB>& operator = (const conv_gpc<VSA, VSB>&);
+
+        //--------------------------------------------------------------------
+        void free_polygon(gpc_polygon& p);
+        void free_result();
+        void free_gpc_data();
+        void start_contour();
+        void add_vertex(double x, double y);
+        void end_contour(unsigned orientation);
+        void make_polygon(gpc_polygon& p);
+        void start_extracting();
+        bool next_contour();
+        bool next_vertex(double* x, double* y);
+
+
+        //--------------------------------------------------------------------
+        template<class VS> void add(VS& src, gpc_polygon& p)
+        {
+            unsigned cmd;
+            double x, y;
+            double start_x = 0.0;
+            double start_y = 0.0;
+            bool line_to = false;
+            unsigned orientation = 0;
+
+            m_contour_accumulator.remove_all();
+
+            while(!is_stop(cmd = src.vertex(&x, &y)))
+            {
+                if(is_vertex(cmd))
+                {
+                    if(is_move_to(cmd))
+                    {
+                        if(line_to)
+                        {
+                            end_contour(orientation);
+                            orientation = 0;
+                        }
+                        start_contour();
+                        start_x = x;
+                        start_y = y;
+                    }
+                    add_vertex(x, y);
+                    line_to = true;
+                }
+                else
+                {
+                    if(is_end_poly(cmd))
+                    {
+                        orientation = get_orientation(cmd);
+                        if(line_to && is_closed(cmd))
+                        {
+                            add_vertex(start_x, start_y);
+                        }
+                    }
+                }
+            }
+            if(line_to)
+            {
+                end_contour(orientation);
+            }
+            make_polygon(p);
+        }
+
+
+    private:
+        //--------------------------------------------------------------------
+        source_a_type*             m_src_a;
+        source_b_type*             m_src_b;
+        status                     m_status;
+        int                        m_vertex;
+        int                        m_contour;
+        gpc_op_e                   m_operation;
+        vertex_array_type          m_vertex_accumulator;
+        contour_header_array_type  m_contour_accumulator;
+        gpc_polygon                m_poly_a;
+        gpc_polygon                m_poly_b;
+        gpc_polygon                m_result;
+    };
+
+
+
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::free_polygon(gpc_polygon& p)
+    {
+        int i;
+        for(i = 0; i < p.num_contours; i++)
+        {
+            pod_allocator<gpc_vertex>::deallocate(p.contour[i].vertex, 
+                                                  p.contour[i].num_vertices);
+        }
+        pod_allocator<gpc_vertex_list>::deallocate(p.contour, p.num_contours);
+        std::memset(&p, 0, sizeof(gpc_polygon));
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::free_result()
+    {
+        if(m_result.contour)
+        {
+            gpc_free_polygon(&m_result);
+        }
+        std::memset(&m_result, 0, sizeof(m_result));
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::free_gpc_data()
+    {
+        free_polygon(m_poly_a);
+        free_polygon(m_poly_b);
+        free_result();
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::start_contour()
+    {
+        contour_header_type h;
+        std::memset(&h, 0, sizeof(h));
+        m_contour_accumulator.add(h);
+        m_vertex_accumulator.remove_all();
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    inline void conv_gpc<VSA, VSB>::add_vertex(double x, double y)
+    {
+        gpc_vertex v;
+        v.x = x;
+        v.y = y;
+        m_vertex_accumulator.add(v);
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::end_contour(unsigned /*orientation*/)
+    {
+        if(m_contour_accumulator.size())
+        {
+            if(m_vertex_accumulator.size() > 2)
+            {
+                contour_header_type& h = 
+                    m_contour_accumulator[m_contour_accumulator.size() - 1];
+
+                h.num_vertices = m_vertex_accumulator.size();
+                h.hole_flag = 0;
+
+                // TO DO: Clarify the "holes"
+                //if(is_cw(orientation)) h.hole_flag = 1;
+
+                h.vertices = pod_allocator<gpc_vertex>::allocate(h.num_vertices);
+                gpc_vertex* d = h.vertices;
+                int i;
+                for(i = 0; i < h.num_vertices; i++)
+                {
+                    const gpc_vertex& s = m_vertex_accumulator[i];
+                    d->x = s.x;
+                    d->y = s.y;
+                    ++d;
+                }
+            }
+            else
+            {
+                m_vertex_accumulator.remove_last();
+            }
+        }
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::make_polygon(gpc_polygon& p)
+    {
+        free_polygon(p);
+        if(m_contour_accumulator.size())
+        {
+            p.num_contours = m_contour_accumulator.size();
+
+            p.hole = 0;
+            p.contour = pod_allocator<gpc_vertex_list>::allocate(p.num_contours);
+
+            int i;
+            gpc_vertex_list* pv = p.contour;
+            for(i = 0; i < p.num_contours; i++)
+            {
+                const contour_header_type& h = m_contour_accumulator[i];
+                pv->num_vertices = h.num_vertices;
+                pv->vertex = h.vertices;
+                ++pv;
+            }
+        }
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::start_extracting()
+    {
+        m_status = status_move_to;
+        m_contour = -1;
+        m_vertex = -1;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    bool conv_gpc<VSA, VSB>::next_contour()
+    {
+        if(++m_contour < m_result.num_contours)
+        {
+            m_vertex = -1;
+            return true;
+        }
+        return false;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    inline bool conv_gpc<VSA, VSB>::next_vertex(double* x, double* y)
+    {
+        const gpc_vertex_list& vlist = m_result.contour[m_contour];
+        if(++m_vertex < vlist.num_vertices)
+        {
+            const gpc_vertex& v = vlist.vertex[m_vertex];
+            *x = v.x;
+            *y = v.y;
+            return true;
+        }
+        return false;
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    void conv_gpc<VSA, VSB>::rewind(unsigned path_id)
+    {
+        free_result();
+        m_src_a->rewind(path_id);
+        m_src_b->rewind(path_id);
+        add(*m_src_a, m_poly_a);
+        add(*m_src_b, m_poly_b);
+        switch(m_operation)
+        {
+           case gpc_or:
+                gpc_polygon_clip(GPC_UNION,
+                                 &m_poly_a,
+                                 &m_poly_b,
+                                 &m_result);
+               break;
+
+           case gpc_and:
+                gpc_polygon_clip(GPC_INT,
+                                 &m_poly_a,
+                                 &m_poly_b,
+                                 &m_result);
+               break;
+
+           case gpc_xor:
+                gpc_polygon_clip(GPC_XOR,
+                                 &m_poly_a,
+                                 &m_poly_b,
+                                 &m_result);
+               break;
+
+           case gpc_a_minus_b:
+                gpc_polygon_clip(GPC_DIFF,
+                                 &m_poly_a,
+                                 &m_poly_b,
+                                 &m_result);
+               break;
+
+           case gpc_b_minus_a:
+                gpc_polygon_clip(GPC_DIFF,
+                                 &m_poly_b,
+                                 &m_poly_a,
+                                 &m_result);
+               break;
+        }
+        start_extracting();
+    }
+
+
+    //------------------------------------------------------------------------
+    template<class VSA, class VSB> 
+    unsigned conv_gpc<VSA, VSB>::vertex(double* x, double* y)
+    {
+        if(m_status == status_move_to)
+        {
+            if(next_contour()) 
+            {
+                if(next_vertex(x, y))
+                {
+                    m_status = status_line_to;
+                    return path_cmd_move_to;
+                }
+                m_status = status_stop;
+                return path_cmd_end_poly | path_flags_close;
+            }
+        }
+        else
+        {
+            if(next_vertex(x, y))
+            {
+                return path_cmd_line_to;
+            }
+            else
+            {
+                m_status = status_move_to;
+            }
+            return path_cmd_end_poly | path_flags_close;
+        }
+        return path_cmd_stop;
+    }
+
+   
+}
+
+
+#endif
--- a/Show More
+++ b/Show More