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85 lines
2.2 KiB
Objective-C
85 lines
2.2 KiB
Objective-C
// 25 june 2016
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#import "uipriv_darwin.h"
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struct uiImage {
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NSImage *i;
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NSSize size;
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};
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uiImage *uiNewImage(double width, double height)
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{
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uiImage *i;
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i = uiprivNew(uiImage);
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i->size = NSMakeSize(width, height);
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i->i = [[NSImage alloc] initWithSize:i->size];
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return i;
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}
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void uiFreeImage(uiImage *i)
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{
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[i->i release];
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uiprivFree(i);
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}
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void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, int byteStride)
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{
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NSBitmapImageRep *repCalibrated, *repsRGB;
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int x, y;
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uint8_t *pix, *data;
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NSInteger realStride;
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repCalibrated = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
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pixelsWide:pixelWidth
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pixelsHigh:pixelHeight
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bitsPerSample:8
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samplesPerPixel:4
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hasAlpha:YES
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isPlanar:NO
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colorSpaceName:NSCalibratedRGBColorSpace
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bitmapFormat:0
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bytesPerRow:0
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bitsPerPixel:32];
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// Apple doesn't explicitly document this, but we apparently need to use native system endian for the data :|
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// TODO split this into a utility routine?
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// TODO find proper documentation
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// TODO test this on a big-endian system somehow; I have a feeling the above comment is wrong about the diagnosis since the order we are specifying is now 0xAABBGGRR
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pix = (uint8_t *) pixels;
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data = (uint8_t *) [repCalibrated bitmapData];
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realStride = [repCalibrated bytesPerRow];
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for (y = 0; y < pixelHeight; y++) {
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for (x = 0; x < pixelWidth * 4; x += 4) {
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union {
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uint32_t v32;
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uint8_t v8[4];
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} v;
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v.v32 = ((uint32_t) (pix[x + 3])) << 24;
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v.v32 |= ((uint32_t) (pix[x + 2])) << 16;
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v.v32 |= ((uint32_t) (pix[x + 1])) << 8;
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v.v32 |= ((uint32_t) (pix[x]));
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data[x] = v.v8[0];
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data[x + 1] = v.v8[1];
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data[x + 2] = v.v8[2];
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data[x + 3] = v.v8[3];
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}
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pix += byteStride;
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data += realStride;
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}
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// we can't call the constructor with this, but we can retag (NOT convert)
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repsRGB = [repCalibrated bitmapImageRepByRetaggingWithColorSpace:[NSColorSpace sRGBColorSpace]];
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[i->i addRepresentation:repsRGB];
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[repsRGB setSize:i->size];
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// don't release repsRGB; it may be equivalent to repCalibrated
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// do release repCalibrated though; NSImage has a ref to either it or to repsRGB
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[repCalibrated release];
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}
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NSImage *uiprivImageNSImage(uiImage *i)
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{
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return i->i;
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}
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