2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2010 Google Inc. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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31 #include "GraphicsContext3D.h"
35 #include <CoreGraphics/CGBitmapContext.h>
36 #include <CoreGraphics/CGContext.h>
37 #include <CoreGraphics/CGImage.h>
41 bool GraphicsContext3D::getImageData(Image* image,
44 bool premultiplyAlpha,
45 Vector<uint8_t>& outputVector)
49 CGImageRef cgImage = image->nativeImageForCurrentFrame();
52 int width = CGImageGetWidth(cgImage);
53 int height = CGImageGetHeight(cgImage);
54 // FIXME: we should get rid of this temporary copy where possible.
55 int tempRowBytes = width * 4;
56 Vector<uint8_t> tempVector;
57 tempVector.resize(height * tempRowBytes);
58 // Try to reuse the color space from the image to preserve its colors.
59 // Some images use a color space (such as indexed) unsupported by the bitmap context.
60 CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage);
61 bool releaseColorSpace = false;
62 CGColorSpaceModel colorSpaceModel = CGColorSpaceGetModel(colorSpace);
63 switch (colorSpaceModel) {
64 case kCGColorSpaceModelMonochrome:
65 case kCGColorSpaceModelRGB:
66 case kCGColorSpaceModelCMYK:
67 case kCGColorSpaceModelLab:
68 case kCGColorSpaceModelDeviceN:
71 colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGBLinear);
72 releaseColorSpace = true;
75 CGContextRef tempContext = CGBitmapContextCreate(tempVector.data(),
76 width, height, 8, tempRowBytes,
78 // FIXME: change this!
79 kCGImageAlphaPremultipliedLast);
80 if (releaseColorSpace)
81 CGColorSpaceRelease(colorSpace);
84 CGContextSetBlendMode(tempContext, kCGBlendModeCopy);
85 CGContextDrawImage(tempContext,
86 CGRectMake(0, 0, static_cast<CGFloat>(width), static_cast<CGFloat>(height)),
88 CGContextRelease(tempContext);
89 // Pack the pixel data into the output vector.
90 unsigned long componentsPerPixel, bytesPerComponent;
91 if (!computeFormatAndTypeParameters(format, type, &componentsPerPixel, &bytesPerComponent))
93 int rowBytes = width * componentsPerPixel * bytesPerComponent;
94 outputVector.resize(height * rowBytes);
95 CGImageAlphaInfo info = CGImageGetAlphaInfo(cgImage);
96 bool hasAlphaChannel = (info != kCGImageAlphaNone
97 && info != kCGImageAlphaNoneSkipLast
98 && info != kCGImageAlphaNoneSkipFirst);
99 AlphaOp neededAlphaOp = kAlphaDoNothing;
100 if (!premultiplyAlpha && hasAlphaChannel)
101 // FIXME: must fetch the image data before the premultiplication step.
102 neededAlphaOp = kAlphaDoUnmultiply;
103 return packPixels(tempVector.data(), kSourceFormatRGBA8, width, height, 0,
104 format, type, neededAlphaOp, outputVector.data());
108 } // namespace WebCore
110 #endif // ENABLE(3D_CANVAS)