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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"
static int kMaxImageBufferSize = 4096;
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 = current->localToParentTransform() * absoluteTransform;
if (current->isSVGRoot())
break;
current = current->parent();
}
}
bool SVGImageBufferTools::createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, OwnPtr<ImageBuffer>& imageBuffer, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntRect paintRect = calculateImageBufferRect(targetRect, absoluteTransform);
// Don't create empty ImageBuffers.
if (paintRect.isEmpty())
return false;
IntSize clampedSize = clampedAbsoluteSize(paintRect.size());
OwnPtr<ImageBuffer> image = ImageBuffer::create(clampedSize, colorSpace, renderingMode);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
ASSERT(imageContext);
// This is done in absolute coordinates.
imageContext->translate(-paintRect.x(), -paintRect.y());
imageContext->concatCTM(absoluteTransform);
// This happens in local coordinates.
imageContext->scale(FloatSize(static_cast<float>(clampedSize.width()) / paintRect.width(),
static_cast<float>(clampedSize.height()) / paintRect.height()));
imageBuffer = image.release();
return true;
}
bool SVGImageBufferTools::createImageBufferForPattern(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntSize imageSize(roundedIntSize(clampedAbsoluteTargetRect.size()));
IntSize unclampedImageSize(roundedIntSize(absoluteTargetRect.size()));
// Don't create empty ImageBuffers.
if (imageSize.isEmpty())
return false;
OwnPtr<ImageBuffer> image = ImageBuffer::create(imageSize, colorSpace, renderingMode);
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, 0);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation = subtreeContentTransformation * contentTransformation;
ASSERT(!item->needsLayout());
item->paint(info, IntPoint());
contentTransformation = savedContentTransformation;
}
void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& targetRect, OwnPtr<ImageBuffer>& imageBuffer)
{
ASSERT(context);
ASSERT(imageBuffer);
FloatRect absoluteTargetRect = calculateImageBufferRect(targetRect, absoluteTransform);
// 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(), absoluteTargetRect);
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();
}
FloatRect SVGImageBufferTools::clampedAbsoluteTargetRect(const FloatRect& absoluteTargetRect)
{
const FloatSize maxImageBufferSize(kMaxImageBufferSize, kMaxImageBufferSize);
return FloatRect(absoluteTargetRect.location(), absoluteTargetRect.size().shrunkTo(maxImageBufferSize));
}
IntSize SVGImageBufferTools::clampedAbsoluteSize(const IntSize& absoluteSize)
{
const IntSize maxImageBufferSize(kMaxImageBufferSize, kMaxImageBufferSize);
return absoluteSize.shrunkTo(maxImageBufferSize);
}
void SVGImageBufferTools::clear2DRotation(AffineTransform& transform)
{
AffineTransform::DecomposedType decomposition;
transform.decompose(decomposition);
decomposition.angle = 0;
transform.recompose(decomposition);
}
}
#endif // ENABLE(SVG)
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