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Diffstat (limited to 'WebCore/rendering/RenderSVGResourceMasker.cpp')
-rw-r--r-- | WebCore/rendering/RenderSVGResourceMasker.cpp | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/WebCore/rendering/RenderSVGResourceMasker.cpp b/WebCore/rendering/RenderSVGResourceMasker.cpp new file mode 100644 index 0000000..2923c6e --- /dev/null +++ b/WebCore/rendering/RenderSVGResourceMasker.cpp @@ -0,0 +1,196 @@ +/* + * 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()); +} + +} |