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/*
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright 2014 The Chromium Authors. 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 "core/rendering/svg/RenderSVGResourcePattern.h"
#include "core/dom/ElementTraversal.h"
#include "core/paint/TransformRecorder.h"
#include "core/rendering/svg/SVGRenderingContext.h"
#include "core/svg/SVGFitToViewBox.h"
#include "core/svg/SVGPatternElement.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/paint/DisplayItemList.h"
#include "third_party/skia/include/core/SkPicture.h"
namespace blink {
struct PatternData {
WTF_MAKE_FAST_ALLOCATED;
public:
RefPtr<Pattern> pattern;
AffineTransform transform;
};
RenderSVGResourcePattern::RenderSVGResourcePattern(SVGPatternElement* node)
: RenderSVGResourcePaintServer(node)
, m_shouldCollectPatternAttributes(true)
{
}
void RenderSVGResourcePattern::trace(Visitor* visitor)
{
visitor->trace(m_attributes);
RenderSVGResourcePaintServer::trace(visitor);
}
void RenderSVGResourcePattern::removeAllClientsFromCache(bool markForInvalidation)
{
m_patternMap.clear();
m_shouldCollectPatternAttributes = true;
markAllClientsForInvalidation(markForInvalidation ? PaintInvalidation : ParentOnlyInvalidation);
}
void RenderSVGResourcePattern::removeClientFromCache(RenderObject* client, bool markForInvalidation)
{
ASSERT(client);
m_patternMap.remove(client);
markClientForInvalidation(client, markForInvalidation ? PaintInvalidation : ParentOnlyInvalidation);
}
PatternData* RenderSVGResourcePattern::patternForRenderer(const RenderObject& object)
{
ASSERT(!m_shouldCollectPatternAttributes);
// FIXME: the double hash lookup is needed to guard against paint-time invalidation
// (painting animated images may trigger layout invals which delete our map entry).
// Hopefully that will be addressed at some point, and then we can optimize the lookup.
if (PatternData* currentData = m_patternMap.get(&object))
return currentData;
return m_patternMap.set(&object, buildPatternData(object)).storedValue->value.get();
}
PassOwnPtr<PatternData> RenderSVGResourcePattern::buildPatternData(const RenderObject& object)
{
// If we couldn't determine the pattern content element root, stop here.
if (!m_attributes.patternContentElement())
return nullptr;
// An empty viewBox disables rendering.
if (m_attributes.hasViewBox() && m_attributes.viewBox().isEmpty())
return nullptr;
ASSERT(element());
// Compute tile metrics.
FloatRect clientBoundingBox = object.objectBoundingBox();
FloatRect tileBounds = SVGLengthContext::resolveRectangle(element(),
m_attributes.patternUnits(), clientBoundingBox,
m_attributes.x(), m_attributes.y(), m_attributes.width(), m_attributes.height());
if (tileBounds.isEmpty())
return nullptr;
AffineTransform tileTransform;
if (m_attributes.hasViewBox()) {
if (m_attributes.viewBox().isEmpty())
return nullptr;
tileTransform = SVGFitToViewBox::viewBoxToViewTransform(m_attributes.viewBox(),
m_attributes.preserveAspectRatio(), tileBounds.width(), tileBounds.height());
} else {
// A viewbox overrides patternContentUnits, per spec.
if (m_attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
tileTransform.scale(clientBoundingBox.width(), clientBoundingBox.height());
}
OwnPtr<PatternData> patternData = adoptPtr(new PatternData);
patternData->pattern = Pattern::createPicturePattern(asPicture(tileBounds, tileTransform));
// Compute pattern space transformation.
patternData->transform.translate(tileBounds.x(), tileBounds.y());
AffineTransform patternTransform = m_attributes.patternTransform();
if (!patternTransform.isIdentity())
patternData->transform = patternTransform * patternData->transform;
return patternData.release();
}
SVGPaintServer RenderSVGResourcePattern::preparePaintServer(const RenderObject& object)
{
clearInvalidationMask();
SVGPatternElement* patternElement = toSVGPatternElement(element());
if (!patternElement)
return SVGPaintServer::invalid();
if (m_shouldCollectPatternAttributes) {
patternElement->synchronizeAnimatedSVGAttribute(anyQName());
m_attributes = PatternAttributes();
patternElement->collectPatternAttributes(m_attributes);
m_shouldCollectPatternAttributes = false;
}
// Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified,
// then the given effect (e.g. a gradient or a filter) will be ignored.
FloatRect objectBoundingBox = object.objectBoundingBox();
if (m_attributes.patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
return SVGPaintServer::invalid();
PatternData* patternData = patternForRenderer(object);
if (!patternData || !patternData->pattern)
return SVGPaintServer::invalid();
patternData->pattern->setPatternSpaceTransform(patternData->transform);
return SVGPaintServer(patternData->pattern);
}
PassRefPtr<const SkPicture> RenderSVGResourcePattern::asPicture(const FloatRect& tileBounds,
const AffineTransform& tileTransform) const
{
ASSERT(!m_shouldCollectPatternAttributes);
AffineTransform contentTransform;
if (m_attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
contentTransform = tileTransform;
// Draw the content into a Picture.
OwnPtr<DisplayItemList> displayItemList;
if (RuntimeEnabledFeatures::slimmingPaintEnabled())
displayItemList = DisplayItemList::create();
GraphicsContext recordingContext(nullptr, displayItemList.get());
recordingContext.beginRecording(FloatRect(FloatPoint(), tileBounds.size()));
ASSERT(m_attributes.patternContentElement());
RenderSVGResourceContainer* patternRenderer =
toRenderSVGResourceContainer(m_attributes.patternContentElement()->renderer());
ASSERT(patternRenderer);
ASSERT(!patternRenderer->needsLayout());
SubtreeContentTransformScope contentTransformScope(contentTransform);
{
TransformRecorder transformRecorder(recordingContext, patternRenderer->displayItemClient(), tileTransform);
for (RenderObject* child = patternRenderer->firstChild(); child; child = child->nextSibling())
SVGRenderingContext::renderSubtree(&recordingContext, child);
}
if (displayItemList)
displayItemList->replay(&recordingContext);
return recordingContext.endRecording();
}
}
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