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Diffstat (limited to 'WebCore/platform/graphics/cg/GraphicsContext3DCG.cpp')
-rw-r--r-- | WebCore/platform/graphics/cg/GraphicsContext3DCG.cpp | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/WebCore/platform/graphics/cg/GraphicsContext3DCG.cpp b/WebCore/platform/graphics/cg/GraphicsContext3DCG.cpp new file mode 100644 index 0000000..c6a8f83 --- /dev/null +++ b/WebCore/platform/graphics/cg/GraphicsContext3DCG.cpp @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2010 Apple Inc. All rights reserved. + * Copyright (C) 2010 Google Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#if ENABLE(3D_CANVAS) + +#include "GraphicsContext3D.h" + +#include "Image.h" + +#include <CoreGraphics/CGBitmapContext.h> +#include <CoreGraphics/CGContext.h> +#include <CoreGraphics/CGImage.h> + +namespace WebCore { + +bool GraphicsContext3D::getImageData(Image* image, + Vector<uint8_t>& outputVector, + bool premultiplyAlpha, + bool* hasAlphaChannel, + AlphaOp* neededAlphaOp, + unsigned int* format) +{ + if (!image) + return false; + CGImageRef cgImage = image->nativeImageForCurrentFrame(); + if (!cgImage) + return false; + int width = CGImageGetWidth(cgImage); + int height = CGImageGetHeight(cgImage); + int rowBytes = width * 4; + CGImageAlphaInfo info = CGImageGetAlphaInfo(cgImage); + *hasAlphaChannel = (info != kCGImageAlphaNone + && info != kCGImageAlphaNoneSkipLast + && info != kCGImageAlphaNoneSkipFirst); + if (!premultiplyAlpha && *hasAlphaChannel) + // FIXME: must fetch the image data before the premultiplication step + *neededAlphaOp = kAlphaDoUnmultiply; + *format = RGBA; + outputVector.resize(height * rowBytes); + // Try to reuse the color space from the image to preserve its colors. + // Some images use a color space (such as indexed) unsupported by the bitmap context. + CGColorSpaceRef colorSpace = CGImageGetColorSpace(cgImage); + bool releaseColorSpace = false; + CGColorSpaceModel colorSpaceModel = CGColorSpaceGetModel(colorSpace); + switch (colorSpaceModel) { + case kCGColorSpaceModelMonochrome: + case kCGColorSpaceModelRGB: + case kCGColorSpaceModelCMYK: + case kCGColorSpaceModelLab: + case kCGColorSpaceModelDeviceN: + break; + default: + colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGBLinear); + releaseColorSpace = true; + break; + } + CGContextRef tmpContext = CGBitmapContextCreate(outputVector.data(), + width, height, 8, rowBytes, + colorSpace, + kCGImageAlphaPremultipliedLast); + if (releaseColorSpace) + CGColorSpaceRelease(colorSpace); + if (!tmpContext) + return false; + CGContextSetBlendMode(tmpContext, kCGBlendModeCopy); + CGContextDrawImage(tmpContext, + CGRectMake(0, 0, static_cast<CGFloat>(width), static_cast<CGFloat>(height)), + cgImage); + CGContextRelease(tmpContext); + return true; +} + + +} // namespace WebCore + +#endif // ENABLE(3D_CANVAS) |