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/*
Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
This file is part of the KDE project
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 "SVGPatternElement.h"
#include "Document.h"
#include "FloatConversion.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "MappedAttribute.h"
#include "PatternAttributes.h"
#include "RenderSVGContainer.h"
#include "SVGLength.h"
#include "SVGNames.h"
#include "SVGPaintServerPattern.h"
#include "SVGRenderSupport.h"
#include "SVGSVGElement.h"
#include "SVGStyledTransformableElement.h"
#include "SVGTransformList.h"
#include "SVGTransformable.h"
#include "SVGUnitTypes.h"
#include "TransformationMatrix.h"
#include <math.h>
#include <wtf/MathExtras.h>
#include <wtf/OwnPtr.h>
using namespace std;
namespace WebCore {
SVGPatternElement::SVGPatternElement(const QualifiedName& tagName, Document* doc)
: SVGStyledElement(tagName, doc)
, SVGURIReference()
, SVGTests()
, SVGLangSpace()
, SVGExternalResourcesRequired()
, SVGFitToViewBox()
, m_x(this, SVGNames::xAttr, LengthModeWidth)
, m_y(this, SVGNames::yAttr, LengthModeHeight)
, m_width(this, SVGNames::widthAttr, LengthModeWidth)
, m_height(this, SVGNames::heightAttr, LengthModeHeight)
, m_patternUnits(this, SVGNames::patternUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
, m_patternContentUnits(this, SVGNames::patternContentUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
, m_patternTransform(this, SVGNames::patternTransformAttr, SVGTransformList::create(SVGNames::patternTransformAttr))
, m_href(this, XLinkNames::hrefAttr)
, m_externalResourcesRequired(this, SVGNames::externalResourcesRequiredAttr, false)
, m_viewBox(this, SVGNames::viewBoxAttr)
, m_preserveAspectRatio(this, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create())
{
}
SVGPatternElement::~SVGPatternElement()
{
}
void SVGPatternElement::parseMappedAttribute(MappedAttribute* attr)
{
if (attr->name() == SVGNames::patternUnitsAttr) {
if (attr->value() == "userSpaceOnUse")
setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
else if (attr->value() == "objectBoundingBox")
setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
} else if (attr->name() == SVGNames::patternContentUnitsAttr) {
if (attr->value() == "userSpaceOnUse")
setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
else if (attr->value() == "objectBoundingBox")
setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
} else if (attr->name() == SVGNames::patternTransformAttr) {
SVGTransformList* patternTransforms = patternTransformBaseValue();
if (!SVGTransformable::parseTransformAttribute(patternTransforms, attr->value())) {
ExceptionCode ec = 0;
patternTransforms->clear(ec);
}
} 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()));
if (widthBaseValue().value(this) < 0.0)
document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <width> is not allowed");
} else if (attr->name() == SVGNames::heightAttr) {
setHeightBaseValue(SVGLength(LengthModeHeight, attr->value()));
if (heightBaseValue().value(this) < 0.0)
document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <height> is not allowed");
} else {
if (SVGURIReference::parseMappedAttribute(attr))
return;
if (SVGTests::parseMappedAttribute(attr))
return;
if (SVGLangSpace::parseMappedAttribute(attr))
return;
if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
return;
if (SVGFitToViewBox::parseMappedAttribute(document(), attr))
return;
SVGStyledElement::parseMappedAttribute(attr);
}
}
void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
{
SVGStyledElement::svgAttributeChanged(attrName);
if (!m_resource)
return;
if (attrName == SVGNames::patternUnitsAttr || attrName == SVGNames::patternContentUnitsAttr ||
attrName == SVGNames::patternTransformAttr || attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr ||
SVGURIReference::isKnownAttribute(attrName) ||
SVGTests::isKnownAttribute(attrName) ||
SVGLangSpace::isKnownAttribute(attrName) ||
SVGExternalResourcesRequired::isKnownAttribute(attrName) ||
SVGFitToViewBox::isKnownAttribute(attrName) ||
SVGStyledElement::isKnownAttribute(attrName))
m_resource->invalidate();
}
void SVGPatternElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
if (!m_resource)
return;
m_resource->invalidate();
}
void SVGPatternElement::buildPattern(const FloatRect& targetRect) const
{
PatternAttributes attributes = collectPatternProperties();
// If we didn't find any pattern content, ignore the request.
if (!attributes.patternContentElement() || !renderer() || !renderer()->style())
return;
FloatRect patternBoundaries;
FloatRect patternContentBoundaries;
// Determine specified pattern size
if (attributes.boundingBoxMode())
patternBoundaries = FloatRect(attributes.x().valueAsPercentage() * targetRect.width(),
attributes.y().valueAsPercentage() * targetRect.height(),
attributes.width().valueAsPercentage() * targetRect.width(),
attributes.height().valueAsPercentage() * targetRect.height());
else
patternBoundaries = FloatRect(attributes.x().value(this),
attributes.y().value(this),
attributes.width().value(this),
attributes.height().value(this));
// Clip pattern boundaries to target boundaries
if (patternBoundaries.width() > targetRect.width())
patternBoundaries.setWidth(targetRect.width());
if (patternBoundaries.height() > targetRect.height())
patternBoundaries.setHeight(targetRect.height());
IntSize patternSize(patternBoundaries.width(), patternBoundaries.height());
clampImageBufferSizeToViewport(document()->view(), patternSize);
if (patternSize.width() < static_cast<int>(patternBoundaries.width()))
patternBoundaries.setWidth(patternSize.width());
if (patternSize.height() < static_cast<int>(patternBoundaries.height()))
patternBoundaries.setHeight(patternSize.height());
// Eventually calculate the pattern content boundaries (only needed with overflow="visible").
RenderStyle* style = renderer()->style();
if (style->overflowX() == OVISIBLE && style->overflowY() == OVISIBLE) {
for (Node* n = attributes.patternContentElement()->firstChild(); n; n = n->nextSibling()) {
if (!n->isSVGElement() || !static_cast<SVGElement*>(n)->isStyledTransformable() || !n->renderer())
continue;
patternContentBoundaries.unite(n->renderer()->repaintRectInLocalCoordinates());
}
}
TransformationMatrix viewBoxCTM = viewBoxToViewTransform(viewBox(), preserveAspectRatio(), patternBoundaries.width(), patternBoundaries.height());
FloatRect patternBoundariesIncludingOverflow = patternBoundaries;
// Apply objectBoundingBoxMode fixup for patternContentUnits, if viewBox is not set.
if (!patternContentBoundaries.isEmpty()) {
if (!viewBoxCTM.isIdentity())
patternContentBoundaries = viewBoxCTM.mapRect(patternContentBoundaries);
else if (attributes.boundingBoxModeContent())
patternContentBoundaries = FloatRect(patternContentBoundaries.x() * targetRect.width(),
patternContentBoundaries.y() * targetRect.height(),
patternContentBoundaries.width() * targetRect.width(),
patternContentBoundaries.height() * targetRect.height());
patternBoundariesIncludingOverflow.unite(patternContentBoundaries);
}
IntSize imageSize(lroundf(patternBoundariesIncludingOverflow.width()), lroundf(patternBoundariesIncludingOverflow.height()));
clampImageBufferSizeToViewport(document()->view(), imageSize);
OwnPtr<ImageBuffer> patternImage = ImageBuffer::create(imageSize);
if (!patternImage)
return;
GraphicsContext* context = patternImage->context();
ASSERT(context);
context->save();
// Move to pattern start origin
if (patternBoundariesIncludingOverflow.location() != patternBoundaries.location()) {
context->translate(patternBoundaries.x() - patternBoundariesIncludingOverflow.x(),
patternBoundaries.y() - patternBoundariesIncludingOverflow.y());
patternBoundaries.setLocation(patternBoundariesIncludingOverflow.location());
}
// Process viewBox or boundingBoxModeContent correction
if (!viewBoxCTM.isIdentity())
context->concatCTM(viewBoxCTM);
else if (attributes.boundingBoxModeContent()) {
context->translate(targetRect.x(), targetRect.y());
context->scale(FloatSize(targetRect.width(), targetRect.height()));
}
// Render subtree into ImageBuffer
for (Node* n = attributes.patternContentElement()->firstChild(); n; n = n->nextSibling()) {
if (!n->isSVGElement() || !static_cast<SVGElement*>(n)->isStyled() || !n->renderer())
continue;
renderSubtreeToImage(patternImage.get(), n->renderer());
}
context->restore();
m_resource->setPatternTransform(attributes.patternTransform());
m_resource->setPatternBoundaries(patternBoundaries);
m_resource->setTile(patternImage.release());
}
RenderObject* SVGPatternElement::createRenderer(RenderArena* arena, RenderStyle*)
{
RenderSVGContainer* patternContainer = new (arena) RenderSVGContainer(this);
patternContainer->setDrawsContents(false);
return patternContainer;
}
SVGResource* SVGPatternElement::canvasResource()
{
if (!m_resource)
m_resource = SVGPaintServerPattern::create(this);
return m_resource.get();
}
PatternAttributes SVGPatternElement::collectPatternProperties() const
{
PatternAttributes attributes;
HashSet<const SVGPatternElement*> processedPatterns;
const SVGPatternElement* current = this;
while (current) {
if (!attributes.hasX() && current->hasAttribute(SVGNames::xAttr))
attributes.setX(current->x());
if (!attributes.hasY() && current->hasAttribute(SVGNames::yAttr))
attributes.setY(current->y());
if (!attributes.hasWidth() && current->hasAttribute(SVGNames::widthAttr))
attributes.setWidth(current->width());
if (!attributes.hasHeight() && current->hasAttribute(SVGNames::heightAttr))
attributes.setHeight(current->height());
if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::patternUnitsAttr))
attributes.setBoundingBoxMode(current->patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
if (!attributes.hasBoundingBoxModeContent() && current->hasAttribute(SVGNames::patternContentUnitsAttr))
attributes.setBoundingBoxModeContent(current->patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
if (!attributes.hasPatternTransform() && current->hasAttribute(SVGNames::patternTransformAttr))
attributes.setPatternTransform(current->patternTransform()->consolidate().matrix());
if (!attributes.hasPatternContentElement() && current->hasChildNodes())
attributes.setPatternContentElement(current);
processedPatterns.add(current);
// Respect xlink:href, take attributes from referenced element
Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href()));
if (refNode && refNode->hasTagName(SVGNames::patternTag)) {
current = static_cast<const SVGPatternElement*>(const_cast<const Node*>(refNode));
// Cycle detection
if (processedPatterns.contains(current))
return PatternAttributes();
} else
current = 0;
}
return attributes;
}
}
#endif // ENABLE(SVG)
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