/* Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann 2004, 2005, 2006, 2007 Rob Buis 2005 Alexander Kellett 2009 Dirk Schulze 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 "SVGMaskElement.h" #include "CanvasPixelArray.h" #include "CSSStyleSelector.h" #include "GraphicsContext.h" #include "Image.h" #include "ImageBuffer.h" #include "ImageData.h" #include "MappedAttribute.h" #include "RenderObject.h" #include "RenderSVGContainer.h" #include "SVGLength.h" #include "SVGNames.h" #include "SVGRenderSupport.h" #include "SVGUnitTypes.h" #include #include #include #include using namespace std; namespace WebCore { SVGMaskElement::SVGMaskElement(const QualifiedName& tagName, Document* doc) : SVGStyledLocatableElement(tagName, doc) , SVGURIReference() , SVGTests() , SVGLangSpace() , SVGExternalResourcesRequired() , m_maskUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) , m_maskContentUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) , m_x(LengthModeWidth, "-10%") , m_y(LengthModeHeight, "-10%") , m_width(LengthModeWidth, "120%") , m_height(LengthModeHeight, "120%") { // Spec: If the x/y attribute is not specified, the effect is as if a value of "-10%" were specified. // Spec: If the width/height attribute is not specified, the effect is as if a value of "120%" were specified. } SVGMaskElement::~SVGMaskElement() { } void SVGMaskElement::parseMappedAttribute(MappedAttribute* attr) { if (attr->name() == SVGNames::maskUnitsAttr) { if (attr->value() == "userSpaceOnUse") setMaskUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE); else if (attr->value() == "objectBoundingBox") setMaskUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); } else if (attr->name() == SVGNames::maskContentUnitsAttr) { if (attr->value() == "userSpaceOnUse") setMaskContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE); else if (attr->value() == "objectBoundingBox") setMaskContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); } else if (attr->name() == SVGNames::xAttr) setXBaseValue(SVGLength(LengthModeWidth, attr->value())); else if (attr->name() == SVGNames::yAttr) setYBaseValue(SVGLength(LengthModeHeight, attr->value())); else if (attr->name() == SVGNames::widthAttr) setWidthBaseValue(SVGLength(LengthModeWidth, attr->value())); else if (attr->name() == SVGNames::heightAttr) setHeightBaseValue(SVGLength(LengthModeHeight, attr->value())); else { if (SVGURIReference::parseMappedAttribute(attr)) return; if (SVGTests::parseMappedAttribute(attr)) return; if (SVGLangSpace::parseMappedAttribute(attr)) return; if (SVGExternalResourcesRequired::parseMappedAttribute(attr)) return; SVGStyledElement::parseMappedAttribute(attr); } } void SVGMaskElement::svgAttributeChanged(const QualifiedName& attrName) { SVGStyledElement::svgAttributeChanged(attrName); if (attrName == SVGNames::maskUnitsAttr || attrName == SVGNames::maskContentUnitsAttr || attrName == SVGNames::xAttr || attrName == SVGNames::yAttr || attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr || SVGURIReference::isKnownAttribute(attrName) || SVGTests::isKnownAttribute(attrName) || SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName) || SVGStyledElement::isKnownAttribute(attrName)) invalidateCanvasResources(); } void SVGMaskElement::synchronizeProperty(const QualifiedName& attrName) { SVGStyledElement::synchronizeProperty(attrName); if (attrName == anyQName()) { synchronizeMaskUnits(); synchronizeMaskContentUnits(); synchronizeX(); synchronizeY(); synchronizeExternalResourcesRequired(); synchronizeHref(); return; } if (attrName == SVGNames::maskUnitsAttr) synchronizeMaskUnits(); else if (attrName == SVGNames::maskContentUnitsAttr) synchronizeMaskContentUnits(); else if (attrName == SVGNames::xAttr) synchronizeX(); else if (attrName == SVGNames::yAttr) synchronizeY(); else if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) synchronizeExternalResourcesRequired(); else if (SVGURIReference::isKnownAttribute(attrName)) synchronizeHref(); } void SVGMaskElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) { SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta); invalidateCanvasResources(); } FloatRect SVGMaskElement::maskBoundingBox(const FloatRect& objectBoundingBox) const { FloatRect maskBBox; if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) maskBBox = FloatRect(x().valueAsPercentage() * objectBoundingBox.width() + objectBoundingBox.x(), y().valueAsPercentage() * objectBoundingBox.height() + objectBoundingBox.y(), width().valueAsPercentage() * objectBoundingBox.width(), height().valueAsPercentage() * objectBoundingBox.height()); else maskBBox = FloatRect(x().value(this), y().value(this), width().value(this), height().value(this)); return maskBBox; } PassOwnPtr SVGMaskElement::drawMaskerContent(const RenderObject* object, FloatRect& maskDestRect, bool& emptyMask) const { FloatRect objectBoundingBox = object->objectBoundingBox(); // Mask rect clipped with clippingBoundingBox and filterBoundingBox as long as they are present. maskDestRect = object->repaintRectInLocalCoordinates(); if (maskDestRect.isEmpty()) { emptyMask = true; return 0; } // Calculate the smallest rect for the mask ImageBuffer. FloatRect repaintRect; Vector rendererList; for (Node* node = firstChild(); node; node = node->nextSibling()) { if (!node->isSVGElement() || !static_cast(node)->isStyled() || !node->renderer()) continue; rendererList.append(node->renderer()); repaintRect.unite(node->renderer()->localToParentTransform().mapRect(node->renderer()->repaintRectInLocalCoordinates())); } AffineTransform contextTransform; // We need to scale repaintRect for objectBoundingBox to get the drawing area. if (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(maskDestRect); maskDestRect = repaintRect; IntRect maskImageRect = enclosingIntRect(maskDestRect); maskImageRect.setLocation(IntPoint()); // Don't create ImageBuffers with image size of 0 if (!maskImageRect.width() || !maskImageRect.height()) { emptyMask = true; return 0; } // 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. OwnPtr maskImage = ImageBuffer::create(maskImageRect.size(), LinearRGB); if (!maskImage) return 0; GraphicsContext* maskImageContext = maskImage->context(); ASSERT(maskImageContext); maskImageContext->save(); if (maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) maskImageContext->translate(-maskDestRect.x(), -maskDestRect.y()); maskImageContext->concatCTM(contextTransform); // draw the content into the ImageBuffer Vector::iterator end = rendererList.end(); for (Vector::iterator it = rendererList.begin(); it != end; it++) renderSubtreeToImage(maskImage.get(), *it); maskImageContext->restore(); // create the luminance mask RefPtr imageData(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); } maskImage->putUnmultipliedImageData(imageData.get(), maskImageRect, IntPoint()); return maskImage.release(); } RenderObject* SVGMaskElement::createRenderer(RenderArena* arena, RenderStyle*) { RenderSVGContainer* maskContainer = new (arena) RenderSVGContainer(this); maskContainer->setDrawsContents(false); return maskContainer; } SVGResource* SVGMaskElement::canvasResource(const RenderObject* object) { ASSERT(object); if (m_masker.contains(object)) return m_masker.get(object).get(); RefPtr masker = SVGResourceMasker::create(this); SVGResourceMasker* maskerPtr = masker.get(); m_masker.set(object, masker.release()); return maskerPtr; } void SVGMaskElement::invalidateCanvasResources() { // Don't call through to the base class since the base class will just // invalidate one item in the HashMap. HashMap >::const_iterator end = m_masker.end(); for (HashMap >::const_iterator it = m_masker.begin(); it != end; ++it) it->second->invalidate(); } } #endif // ENABLE(SVG)