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
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10 * 2. Redistributions in binary form must reproduce the above copyright
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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>
39 #include <wtf/RetainPtr.h>
43 bool GraphicsContext3D::getImageData(Image* image,
46 bool premultiplyAlpha,
47 Vector<uint8_t>& outputVector)
51 CGImageRef cgImage = image->nativeImageForCurrentFrame();
54 int width = CGImageGetWidth(cgImage);
55 int height = CGImageGetHeight(cgImage);
56 // FIXME: we should get rid of this temporary copy where possible.
57 int tempRowBytes = width * 4;
58 Vector<uint8_t> tempVector;
59 tempVector.resize(height * tempRowBytes);
60 // Try to reuse the color space from the image to preserve its colors.
61 // Some images use a color space (such as indexed) unsupported by the bitmap context.
62 CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage);
63 bool releaseColorSpace = false;
64 CGColorSpaceModel colorSpaceModel = CGColorSpaceGetModel(colorSpace);
65 switch (colorSpaceModel) {
66 case kCGColorSpaceModelMonochrome:
67 case kCGColorSpaceModelRGB:
68 case kCGColorSpaceModelCMYK:
69 case kCGColorSpaceModelLab:
70 case kCGColorSpaceModelDeviceN:
73 colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGBLinear);
74 releaseColorSpace = true;
77 CGContextRef tempContext = CGBitmapContextCreate(tempVector.data(),
78 width, height, 8, tempRowBytes,
80 // FIXME: change this!
81 kCGImageAlphaPremultipliedLast);
82 if (releaseColorSpace)
83 CGColorSpaceRelease(colorSpace);
86 CGContextSetBlendMode(tempContext, kCGBlendModeCopy);
87 CGContextDrawImage(tempContext,
88 CGRectMake(0, 0, static_cast<CGFloat>(width), static_cast<CGFloat>(height)),
90 CGContextRelease(tempContext);
91 // Pack the pixel data into the output vector.
92 unsigned long componentsPerPixel, bytesPerComponent;
93 if (!computeFormatAndTypeParameters(format, type, &componentsPerPixel, &bytesPerComponent))
95 int rowBytes = width * componentsPerPixel * bytesPerComponent;
96 outputVector.resize(height * rowBytes);
97 CGImageAlphaInfo info = CGImageGetAlphaInfo(cgImage);
98 bool hasAlphaChannel = (info != kCGImageAlphaNone
99 && info != kCGImageAlphaNoneSkipLast
100 && info != kCGImageAlphaNoneSkipFirst);
101 AlphaOp neededAlphaOp = kAlphaDoNothing;
102 if (!premultiplyAlpha && hasAlphaChannel)
103 // FIXME: must fetch the image data before the premultiplication step.
104 neededAlphaOp = kAlphaDoUnmultiply;
105 return packPixels(tempVector.data(), kSourceFormatRGBA8, width, height, 0,
106 format, type, neededAlphaOp, outputVector.data());
109 void GraphicsContext3D::paintToCanvas(const unsigned char* imagePixels, int imageWidth, int imageHeight, int canvasWidth, int canvasHeight, CGContextRef context)
111 if (!imagePixels || imageWidth <= 0 || imageHeight <= 0 || canvasWidth <= 0 || canvasHeight <= 0 || !context)
113 int rowBytes = imageWidth * 4;
114 RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithData(0, imagePixels, rowBytes * imageHeight, 0));
115 RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
116 RetainPtr<CGImageRef> cgImage(AdoptCF, CGImageCreate(imageWidth, imageHeight, 8, 32, rowBytes, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host,
117 dataProvider.get(), 0, false, kCGRenderingIntentDefault));
118 // CSS styling may cause the canvas's content to be resized on
119 // the page. Go back to the Canvas to figure out the correct
120 // width and height to draw.
121 CGRect rect = CGRectMake(0, 0, canvasWidth, canvasHeight);
122 // We want to completely overwrite the previous frame's
123 // rendering results.
124 CGContextSaveGState(context);
125 CGContextSetBlendMode(context, kCGBlendModeCopy);
126 CGContextSetInterpolationQuality(context, kCGInterpolationNone);
127 CGContextDrawImage(context, rect, cgImage.get());
128 CGContextRestoreGState(context);
131 } // namespace WebCore
133 #endif // ENABLE(3D_CANVAS)