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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 "FrameView.h"
#include "GraphicsContext.h"
#include "RenderObject.h"
#include "RenderSVGContainer.h"
#include "RenderSVGRoot.h"
namespace WebCore {
static AffineTransform& currentContentTransformation()
{
DEFINE_STATIC_LOCAL(AffineTransform, s_currentContentTransformation, ());
return s_currentContentTransformation;
}
void SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(const RenderObject* renderer, AffineTransform& absoluteTransform)
{
const RenderObject* current = renderer;
ASSERT(current);
absoluteTransform = currentContentTransformation();
while (current) {
absoluteTransform.multiply(current->localToParentTransform());
if (current->isSVGRoot())
break;
current = current->parent();
}
}
bool SVGImageBufferTools::createImageBuffer(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ColorSpace colorSpace)
{
IntSize imageSize(roundedImageBufferSize(clampedAbsoluteTargetRect.size()));
IntSize unclampedImageSize(SVGImageBufferTools::roundedImageBufferSize(absoluteTargetRect.size()));
// Don't create empty ImageBuffers.
if (imageSize.isEmpty())
return false;
OwnPtr<ImageBuffer> image = ImageBuffer::create(imageSize, colorSpace);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
ASSERT(imageContext);
// Compensate rounding effects, as the absolute target rect is using floating-point numbers and the image buffer size is integer.
imageContext->scale(FloatSize(unclampedImageSize.width() / absoluteTargetRect.width(), unclampedImageSize.height() / absoluteTargetRect.height()));
imageBuffer = image.release();
return true;
}
void SVGImageBufferTools::renderSubtreeToImageBuffer(ImageBuffer* image, RenderObject* item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(item);
ASSERT(image);
ASSERT(image->context());
PaintInfo info(image->context(), PaintInfo::infiniteRect(), PaintPhaseForeground, 0, 0, 0);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation.multiply(subtreeContentTransformation);
item->layoutIfNeeded();
item->paint(info, 0, 0);
contentTransformation = savedContentTransformation;
}
void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer)
{
ASSERT(context);
ASSERT(imageBuffer);
// The mask image has been created in the absolute coordinate space, as the image should not be scaled.
// So the actual masking process has to be done in the absolute coordinate space as well.
context->concatCTM(absoluteTransform.inverse());
context->clipToImageBuffer(imageBuffer.get(), clampedAbsoluteTargetRect);
context->concatCTM(absoluteTransform);
// When nesting resources, with objectBoundingBox as content unit types, there's no use in caching the
// resulting image buffer as the parent resource already caches the result.
if (!currentContentTransformation().isIdentity())
imageBuffer.clear();
}
IntSize SVGImageBufferTools::roundedImageBufferSize(const FloatSize& size)
{
return IntSize(static_cast<int>(lroundf(size.width())), static_cast<int>(lroundf(size.height())));
}
FloatRect SVGImageBufferTools::clampedAbsoluteTargetRectForRenderer(const RenderObject* renderer, const FloatRect& absoluteTargetRect)
{
ASSERT(renderer);
const RenderSVGRoot* svgRoot = SVGRenderSupport::findTreeRootObject(renderer);
FloatRect clampedAbsoluteTargetRect = absoluteTargetRect;
clampedAbsoluteTargetRect.intersect(svgRoot->contentBoxRect());
return clampedAbsoluteTargetRect;
}
}
#endif // ENABLE(SVG)
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