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/*
* 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)
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