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/*
Copyright (C) Research In Motion Limited 2010. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGImageBufferTools.h"
#include "GraphicsContext.h"
#include "RenderObject.h"
namespace WebCore {
AffineTransform SVGImageBufferTools::absoluteTransformFromContext(GraphicsContext* context)
{
// Extract current transformation matrix used in the original context. Note that this coordinate
// system is flipped compared to SVGs internal coordinate system, done in WebKit level. Fix
// this transformation by flipping the y component.
return context->getCTM() * AffineTransform().flipY();
}
bool SVGImageBufferTools::createImageBuffer(const AffineTransform& absoluteTransform, const FloatRect& absoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ImageColorSpace colorSpace)
{
IntRect imageRect = enclosingIntRect(absoluteTargetRect);
if (imageRect.isEmpty())
return false;
// Allocate an image buffer as big as the absolute unclipped size of the object
OwnPtr<ImageBuffer> image = ImageBuffer::create(imageRect.size(), colorSpace);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
// Transform the mask image coordinate system to absolute screen coordinates
imageContext->translate(-absoluteTargetRect.x(), -absoluteTargetRect.y());
imageContext->concatCTM(absoluteTransform);
imageBuffer = image.release();
return true;
}
void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& absoluteTargetRect, ImageBuffer* imageBuffer)
{
ASSERT(context);
ASSERT(imageBuffer);
// The mask image has been created in the device coordinate space, as the image should not be scaled.
// So the actual masking process has to be done in the device coordinate space as well.
context->concatCTM(absoluteTransform.inverse());
context->clipToImageBuffer(imageBuffer, absoluteTargetRect);
context->concatCTM(absoluteTransform);
}
}
#endif // ENABLE(SVG)
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