/*
Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
2005 Alexander Kellett <lypanov@kde.org>
2009 Dirk Schulze <krit@webkit.org>
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 <math.h>
#include <wtf/MathExtras.h>
#include <wtf/OwnPtr.h>
#include <wtf/Vector.h>
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<ImageBuffer> 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<RenderObject*> rendererList;
for (Node* node = firstChild(); node; node = node->nextSibling()) {
if (!node->isSVGElement() || !static_cast<SVGElement*>(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<ImageBuffer> 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<RenderObject*>::iterator end = rendererList.end();
for (Vector<RenderObject*>::iterator it = rendererList.begin(); it != end; it++)
renderSubtreeToImage(maskImage.get(), *it);
maskImageContext->restore();
// create the luminance mask
RefPtr<ImageData> 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<SVGResourceMasker> 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 RenderObject*, RefPtr<SVGResourceMasker> >::const_iterator end = m_masker.end();
for (HashMap<const RenderObject*, RefPtr<SVGResourceMasker> >::const_iterator it = m_masker.begin(); it != end; ++it)
it->second->invalidate();
}
}
#endif // ENABLE(SVG)