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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>
#include <wtf/RetainPtr.h>
namespace WebCore {
bool GraphicsContext3D::getImageData(Image* image,
unsigned int format,
unsigned int type,
bool premultiplyAlpha,
Vector<uint8_t>& outputVector)
{
if (!image)
return false;
CGImageRef cgImage = image->nativeImageForCurrentFrame();
if (!cgImage)
return false;
int width = CGImageGetWidth(cgImage);
int height = CGImageGetHeight(cgImage);
// FIXME: we should get rid of this temporary copy where possible.
int tempRowBytes = width * 4;
Vector<uint8_t> tempVector;
tempVector.resize(height * tempRowBytes);
// 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 tempContext = CGBitmapContextCreate(tempVector.data(),
width, height, 8, tempRowBytes,
colorSpace,
// FIXME: change this!
kCGImageAlphaPremultipliedLast);
if (releaseColorSpace)
CGColorSpaceRelease(colorSpace);
if (!tempContext)
return false;
CGContextSetBlendMode(tempContext, kCGBlendModeCopy);
CGContextDrawImage(tempContext,
CGRectMake(0, 0, static_cast<CGFloat>(width), static_cast<CGFloat>(height)),
cgImage);
CGContextRelease(tempContext);
// Pack the pixel data into the output vector.
unsigned long componentsPerPixel, bytesPerComponent;
if (!computeFormatAndTypeParameters(format, type, &componentsPerPixel, &bytesPerComponent))
return false;
int rowBytes = width * componentsPerPixel * bytesPerComponent;
outputVector.resize(height * rowBytes);
CGImageAlphaInfo info = CGImageGetAlphaInfo(cgImage);
bool hasAlphaChannel = (info != kCGImageAlphaNone
&& info != kCGImageAlphaNoneSkipLast
&& info != kCGImageAlphaNoneSkipFirst);
AlphaOp neededAlphaOp = kAlphaDoNothing;
if (!premultiplyAlpha && hasAlphaChannel)
// FIXME: must fetch the image data before the premultiplication step.
neededAlphaOp = kAlphaDoUnmultiply;
return packPixels(tempVector.data(), kSourceFormatRGBA8, width, height, 0,
format, type, neededAlphaOp, outputVector.data());
}
void GraphicsContext3D::paintToCanvas(const unsigned char* imagePixels, int imageWidth, int imageHeight, int canvasWidth, int canvasHeight, CGContextRef context)
{
if (!imagePixels || imageWidth <= 0 || imageHeight <= 0 || canvasWidth <= 0 || canvasHeight <= 0 || !context)
return;
int rowBytes = imageWidth * 4;
RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithData(0, imagePixels, rowBytes * imageHeight, 0));
RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
RetainPtr<CGImageRef> cgImage(AdoptCF, CGImageCreate(imageWidth, imageHeight, 8, 32, rowBytes, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
// CSS styling may cause the canvas's content to be resized on
// the page. Go back to the Canvas to figure out the correct
// width and height to draw.
CGRect rect = CGRectMake(0, 0, canvasWidth, canvasHeight);
// We want to completely overwrite the previous frame's
// rendering results.
CGContextSaveGState(context);
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGContextDrawImage(context, rect, cgImage.get());
CGContextRestoreGState(context);
}
} // namespace WebCore
#endif // ENABLE(3D_CANVAS)
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