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/*
* Copyright (C) Research In Motion Limited 2009-2010. 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"
#include "RenderSVGResourceMasker.h"
#include "AffineTransform.h"
#include "CanvasPixelArray.h"
#include "Element.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "GraphicsContext.h"
#include "Image.h"
#include "ImageBuffer.h"
#include "ImageData.h"
#include "IntRect.h"
#include "SVGElement.h"
#include "SVGMaskElement.h"
#include "SVGStyledElement.h"
#include "SVGUnitTypes.h"
#include <wtf/Vector.h>
namespace WebCore {
RenderSVGResourceType RenderSVGResourceMasker::s_resourceType = MaskerResourceType;
RenderSVGResourceMasker::RenderSVGResourceMasker(SVGStyledElement* node)
: RenderSVGResource(node)
{
}
RenderSVGResourceMasker::~RenderSVGResourceMasker()
{
deleteAllValues(m_masker);
m_masker.clear();
}
void RenderSVGResourceMasker::invalidateClients()
{
HashMap<RenderObject*, MaskerData*>::const_iterator end = m_masker.end();
for (HashMap<RenderObject*, MaskerData*>::const_iterator it = m_masker.begin(); it != end; ++it)
it->first->setNeedsLayout(true);
deleteAllValues(m_masker);
m_masker.clear();
}
void RenderSVGResourceMasker::invalidateClient(RenderObject* object)
{
ASSERT(object);
// FIXME: The HashMap should always contain the object on calling invalidateClient. A race condition
// during the parsing can causes a call of invalidateClient right before the call of applyResource.
// We return earlier for the moment. This bug should be fixed in:
// https://bugs.webkit.org/show_bug.cgi?id=35181
if (!m_masker.contains(object))
return;
delete m_masker.take(object);
}
bool RenderSVGResourceMasker::applyResource(RenderObject* object, GraphicsContext* context)
{
ASSERT(object);
ASSERT(context);
if (!m_masker.contains(object))
m_masker.set(object, new MaskerData);
MaskerData* maskerData = m_masker.get(object);
if (!maskerData->maskImage && !maskerData->emptyMask) {
SVGMaskElement* maskElement = static_cast<SVGMaskElement*>(node());
if (!maskElement)
return false;
createMaskImage(maskerData, maskElement, object);
}
if (!maskerData->maskImage)
return false;
context->clipToImageBuffer(maskerData->maskRect, maskerData->maskImage.get());
return true;
}
FloatRect RenderSVGResourceMasker::resourceBoundingBox(const FloatRect& objectBoundingBox) const
{
if (SVGMaskElement* element = static_cast<SVGMaskElement*>(node()))
return element->maskBoundingBox(objectBoundingBox);
return FloatRect();
}
void RenderSVGResourceMasker::createMaskImage(MaskerData* maskerData, const SVGMaskElement* maskElement, RenderObject* object)
{
FloatRect objectBoundingBox = object->objectBoundingBox();
// Mask rect clipped with clippingBoundingBox and filterBoundingBox as long as they are present.
maskerData->maskRect = object->repaintRectInLocalCoordinates();
if (maskerData->maskRect.isEmpty()) {
maskerData->emptyMask = true;
return;
}
// Calculate the smallest rect for the mask ImageBuffer.
FloatRect repaintRect;
Vector<RenderObject*> rendererList;
for (Node* node = maskElement->firstChild(); node; node = node->nextSibling()) {
RenderObject* renderer = node->renderer();
if (!node->isSVGElement() || !static_cast<SVGElement*>(node)->isStyled() || !renderer)
continue;
rendererList.append(renderer);
repaintRect.unite(renderer->localToParentTransform().mapRect(renderer->repaintRectInLocalCoordinates()));
}
AffineTransform contextTransform;
// We need to scale repaintRect for objectBoundingBox to get the drawing area.
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
contextTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
FloatPoint contextAdjustment = repaintRect.location();
repaintRect = contextTransform.mapRect(repaintRect);
repaintRect.move(objectBoundingBox.x(), objectBoundingBox.y());
contextTransform.translate(-contextAdjustment.x(), -contextAdjustment.y());
}
repaintRect.intersect(maskerData->maskRect);
maskerData->maskRect = repaintRect;
IntRect maskImageRect = enclosingIntRect(maskerData->maskRect);
maskImageRect.setLocation(IntPoint());
// Don't create ImageBuffers with image size of 0
if (!maskImageRect.width() || !maskImageRect.height()) {
maskerData->emptyMask = true;
return;
}
// FIXME: This changes color space to linearRGB, the default color space
// for masking operations in SVG. We need a switch for the other color-space
// attribute values sRGB, inherit and auto.
maskerData->maskImage = ImageBuffer::create(maskImageRect.size(), LinearRGB);
if (!maskerData->maskImage)
return;
GraphicsContext* maskImageContext = maskerData->maskImage->context();
ASSERT(maskImageContext);
maskImageContext->save();
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
maskImageContext->translate(-maskerData->maskRect.x(), -maskerData->maskRect.y());
maskImageContext->concatCTM(contextTransform);
// draw the content into the ImageBuffer
Vector<RenderObject*>::iterator end = rendererList.end();
for (Vector<RenderObject*>::iterator it = rendererList.begin(); it != end; it++)
renderSubtreeToImage(maskerData->maskImage.get(), *it);
maskImageContext->restore();
// create the luminance mask
RefPtr<ImageData> imageData(maskerData->maskImage->getUnmultipliedImageData(maskImageRect));
CanvasPixelArray* srcPixelArray(imageData->data());
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArray->length(); pixelOffset += 4) {
unsigned char a = srcPixelArray->get(pixelOffset + 3);
if (!a)
continue;
unsigned char r = srcPixelArray->get(pixelOffset);
unsigned char g = srcPixelArray->get(pixelOffset + 1);
unsigned char b = srcPixelArray->get(pixelOffset + 2);
double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
srcPixelArray->set(pixelOffset + 3, luma);
}
maskerData->maskImage->putUnmultipliedImageData(imageData.get(), maskImageRect, IntPoint());
}
}
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