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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc.
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
* Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
* Copyright (C) 2011 University of Szeged
* Copyright (C) 2018 Adobe Systems Incorporated. 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 "RenderSVGShape.h"
#include "FloatPoint.h"
#include "FloatQuad.h"
#include "GraphicsContext.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "LayoutRepainter.h"
#include "PointerEventsHitRules.h"
#include "RenderSVGResourceMarker.h"
#include "RenderSVGResourceSolidColor.h"
#include "SVGPathData.h"
#include "SVGRenderingContext.h"
#include "SVGResources.h"
#include "SVGResourcesCache.h"
#include "SVGURIReference.h"
#include "StrokeStyleApplier.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/StackStats.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGShape);
class BoundingRectStrokeStyleApplier final : public StrokeStyleApplier {
public:
BoundingRectStrokeStyleApplier(const RenderSVGShape& renderer)
: m_renderer(renderer)
{
}
void strokeStyle(GraphicsContext* context) override
{
SVGRenderSupport::applyStrokeStyleToContext(context, m_renderer.style(), m_renderer);
}
private:
const RenderSVGShape& m_renderer;
};
RenderSVGShape::RenderSVGShape(SVGGraphicsElement& element, RenderStyle&& style)
: RenderSVGModelObject(element, WTFMove(style))
, m_needsBoundariesUpdate(false) // Default is false, the cached rects are empty from the beginning.
, m_needsShapeUpdate(true) // Default is true, so we grab a Path object once from SVGGraphicsElement.
, m_needsTransformUpdate(true) // Default is true, so we grab a AffineTransform object once from SVGGraphicsElement.
{
}
RenderSVGShape::~RenderSVGShape() = default;
void RenderSVGShape::updateShapeFromElement()
{
m_path = createPath();
processMarkerPositions();
m_fillBoundingBox = calculateObjectBoundingBox();
m_strokeBoundingBox = calculateStrokeBoundingBox();
}
bool RenderSVGShape::isEmpty() const
{
// This function should never be called before assigning a new Path to m_path.
// But this bug can happen if this renderer was created and its layout was not
// done before painting. Assert this did not happen but do not crash.
ASSERT(hasPath());
return !hasPath() || path().isEmpty();
}
void RenderSVGShape::fillShape(GraphicsContext& context) const
{
context.fillPath(path());
}
void RenderSVGShape::strokeShape(GraphicsContext& context) const
{
ASSERT(m_path);
Path* usePath = m_path.get();
if (hasNonScalingStroke())
usePath = nonScalingStrokePath(usePath, nonScalingStrokeTransform());
context.strokePath(*usePath);
}
bool RenderSVGShape::shapeDependentStrokeContains(const FloatPoint& point, PointCoordinateSpace pointCoordinateSpace)
{
ASSERT(m_path);
BoundingRectStrokeStyleApplier applier(*this);
if (hasNonScalingStroke() && pointCoordinateSpace != LocalCoordinateSpace) {
AffineTransform nonScalingTransform = nonScalingStrokeTransform();
Path* usePath = nonScalingStrokePath(m_path.get(), nonScalingTransform);
return usePath->strokeContains(applier, nonScalingTransform.mapPoint(point));
}
return m_path->strokeContains(applier, point);
}
bool RenderSVGShape::shapeDependentFillContains(const FloatPoint& point, const WindRule fillRule) const
{
return path().contains(point, fillRule);
}
bool RenderSVGShape::fillContains(const FloatPoint& point, bool requiresFill, const WindRule fillRule)
{
if (m_fillBoundingBox.isEmpty() || !m_fillBoundingBox.contains(point))
return false;
Color fallbackColor;
if (requiresFill && !RenderSVGResource::fillPaintingResource(*this, style(), fallbackColor))
return false;
return shapeDependentFillContains(point, fillRule);
}
bool RenderSVGShape::strokeContains(const FloatPoint& point, bool requiresStroke)
{
if (strokeBoundingBox().isEmpty() || !strokeBoundingBox().contains(point))
return false;
Color fallbackColor;
if (requiresStroke && !RenderSVGResource::strokePaintingResource(*this, style(), fallbackColor))
return false;
return shapeDependentStrokeContains(point);
}
void RenderSVGShape::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
LayoutRepainter repainter(*this, SVGRenderSupport::checkForSVGRepaintDuringLayout(*this) && selfNeedsLayout());
bool updateCachedBoundariesInParents = false;
if (m_needsShapeUpdate || m_needsBoundariesUpdate) {
updateShapeFromElement();
m_needsShapeUpdate = false;
updateRepaintBoundingBox();
m_needsBoundariesUpdate = false;
updateCachedBoundariesInParents = true;
}
if (m_needsTransformUpdate) {
m_localTransform = graphicsElement().animatedLocalTransform();
m_needsTransformUpdate = false;
updateCachedBoundariesInParents = true;
}
// Invalidate all resources of this client if our layout changed.
if (everHadLayout() && selfNeedsLayout())
SVGResourcesCache::clientLayoutChanged(*this);
// If our bounds changed, notify the parents.
if (updateCachedBoundariesInParents)
RenderSVGModelObject::setNeedsBoundariesUpdate();
repainter.repaintAfterLayout();
clearNeedsLayout();
}
Path* RenderSVGShape::nonScalingStrokePath(const Path* path, const AffineTransform& strokeTransform) const
{
static NeverDestroyed<Path> tempPath;
tempPath.get() = *path;
tempPath.get().transform(strokeTransform);
return &tempPath.get();
}
bool RenderSVGShape::setupNonScalingStrokeContext(AffineTransform& strokeTransform, GraphicsContextStateSaver& stateSaver)
{
Optional<AffineTransform> inverse = strokeTransform.inverse();
if (!inverse)
return false;
stateSaver.save();
stateSaver.context()->concatCTM(inverse.value());
return true;
}
AffineTransform RenderSVGShape::nonScalingStrokeTransform() const
{
return graphicsElement().getScreenCTM(SVGLocatable::DisallowStyleUpdate);
}
bool RenderSVGShape::shouldGenerateMarkerPositions() const
{
if (!style().svgStyle().hasMarkers())
return false;
if (!graphicsElement().supportsMarkers())
return false;
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*this);
if (!resources)
return false;
return resources->markerStart() || resources->markerMid() || resources->markerEnd();
}
void RenderSVGShape::fillShape(const RenderStyle& style, GraphicsContext& originalContext)
{
GraphicsContext* context = &originalContext;
Color fallbackColor;
if (RenderSVGResource* fillPaintingResource = RenderSVGResource::fillPaintingResource(*this, style, fallbackColor)) {
if (fillPaintingResource->applyResource(*this, style, context, RenderSVGResourceMode::ApplyToFill))
fillPaintingResource->postApplyResource(*this, context, RenderSVGResourceMode::ApplyToFill, nullptr, this);
else if (fallbackColor.isValid()) {
RenderSVGResourceSolidColor* fallbackResource = RenderSVGResource::sharedSolidPaintingResource();
fallbackResource->setColor(fallbackColor);
if (fallbackResource->applyResource(*this, style, context, RenderSVGResourceMode::ApplyToFill))
fallbackResource->postApplyResource(*this, context, RenderSVGResourceMode::ApplyToFill, nullptr, this);
}
}
}
void RenderSVGShape::strokeShape(const RenderStyle& style, GraphicsContext& originalContext)
{
GraphicsContext* context = &originalContext;
Color fallbackColor;
if (RenderSVGResource* strokePaintingResource = RenderSVGResource::strokePaintingResource(*this, style, fallbackColor)) {
if (strokePaintingResource->applyResource(*this, style, context, RenderSVGResourceMode::ApplyToStroke))
strokePaintingResource->postApplyResource(*this, context, RenderSVGResourceMode::ApplyToStroke, nullptr, this);
else if (fallbackColor.isValid()) {
RenderSVGResourceSolidColor* fallbackResource = RenderSVGResource::sharedSolidPaintingResource();
fallbackResource->setColor(fallbackColor);
if (fallbackResource->applyResource(*this, style, context, RenderSVGResourceMode::ApplyToStroke))
fallbackResource->postApplyResource(*this, context, RenderSVGResourceMode::ApplyToStroke, nullptr, this);
}
}
}
void RenderSVGShape::strokeShape(GraphicsContext& context)
{
if (!style().hasVisibleStroke())
return;
GraphicsContextStateSaver stateSaver(context, false);
if (hasNonScalingStroke()) {
AffineTransform nonScalingTransform = nonScalingStrokeTransform();
if (!setupNonScalingStrokeContext(nonScalingTransform, stateSaver))
return;
}
strokeShape(style(), context);
}
void RenderSVGShape::fillStrokeMarkers(PaintInfo& childPaintInfo)
{
auto paintOrder = RenderStyle::paintTypesForPaintOrder(style().paintOrder());
for (unsigned i = 0; i < paintOrder.size(); ++i) {
switch (paintOrder.at(i)) {
case PaintType::Fill:
fillShape(style(), childPaintInfo.context());
break;
case PaintType::Stroke:
strokeShape(childPaintInfo.context());
break;
case PaintType::Markers:
if (!m_markerPositions.isEmpty())
drawMarkers(childPaintInfo);
break;
}
}
}
void RenderSVGShape::paint(PaintInfo& paintInfo, const LayoutPoint&)
{
if (paintInfo.context().paintingDisabled() || paintInfo.phase != PaintPhase::Foreground
|| style().visibility() == Visibility::Hidden || isEmpty())
return;
FloatRect boundingBox = repaintRectInLocalCoordinates();
if (!SVGRenderSupport::paintInfoIntersectsRepaintRect(boundingBox, m_localTransform, paintInfo))
return;
PaintInfo childPaintInfo(paintInfo);
GraphicsContextStateSaver stateSaver(childPaintInfo.context());
childPaintInfo.applyTransform(m_localTransform);
if (childPaintInfo.phase == PaintPhase::Foreground) {
SVGRenderingContext renderingContext(*this, childPaintInfo);
if (renderingContext.isRenderingPrepared()) {
const SVGRenderStyle& svgStyle = style().svgStyle();
if (svgStyle.shapeRendering() == ShapeRendering::CrispEdges)
childPaintInfo.context().setShouldAntialias(false);
fillStrokeMarkers(childPaintInfo);
}
}
if (style().outlineWidth())
paintOutline(childPaintInfo, IntRect(boundingBox));
}
// This method is called from inside paintOutline() since we call paintOutline()
// while transformed to our coord system, return local coords
void RenderSVGShape::addFocusRingRects(Vector<LayoutRect>& rects, const LayoutPoint&, const RenderLayerModelObject*)
{
LayoutRect rect = LayoutRect(repaintRectInLocalCoordinates());
if (!rect.isEmpty())
rects.append(rect);
}
bool RenderSVGShape::isPointInFill(const FloatPoint& point)
{
return shapeDependentFillContains(point, style().svgStyle().fillRule());
}
bool RenderSVGShape::isPointInStroke(const FloatPoint& point)
{
if (!style().svgStyle().hasStroke())
return false;
return shapeDependentStrokeContains(point, LocalCoordinateSpace);
}
float RenderSVGShape::getTotalLength() const
{
return hasPath() ? path().length() : createPath()->length();
}
FloatPoint RenderSVGShape::getPointAtLength(float distance) const
{
return hasPath() ? path().pointAtLength(distance) : createPath()->pointAtLength(distance);
}
bool RenderSVGShape::nodeAtFloatPoint(const HitTestRequest& request, HitTestResult& result, const FloatPoint& pointInParent, HitTestAction hitTestAction)
{
// We only draw in the forground phase, so we only hit-test then.
if (hitTestAction != HitTestForeground)
return false;
FloatPoint localPoint = m_localTransform.inverse().valueOr(AffineTransform()).mapPoint(pointInParent);
if (!SVGRenderSupport::pointInClippingArea(*this, localPoint))
return false;
PointerEventsHitRules hitRules(PointerEventsHitRules::SVG_PATH_HITTESTING, request, style().pointerEvents());
bool isVisible = (style().visibility() == Visibility::Visible);
if (isVisible || !hitRules.requireVisible) {
const SVGRenderStyle& svgStyle = style().svgStyle();
WindRule fillRule = svgStyle.fillRule();
if (request.svgClipContent())
fillRule = svgStyle.clipRule();
if ((hitRules.canHitStroke && (svgStyle.hasStroke() || !hitRules.requireStroke) && strokeContains(localPoint, hitRules.requireStroke))
|| (hitRules.canHitFill && (svgStyle.hasFill() || !hitRules.requireFill) && fillContains(localPoint, hitRules.requireFill, fillRule))
|| (hitRules.canHitBoundingBox && objectBoundingBox().contains(localPoint))) {
updateHitTestResult(result, LayoutPoint(localPoint));
if (result.addNodeToListBasedTestResult(nodeForHitTest(), request, localPoint) == HitTestProgress::Stop)
return true;
}
}
return false;
}
static inline RenderSVGResourceMarker* markerForType(SVGMarkerType type, RenderSVGResourceMarker* markerStart, RenderSVGResourceMarker* markerMid, RenderSVGResourceMarker* markerEnd)
{
switch (type) {
case StartMarker:
return markerStart;
case MidMarker:
return markerMid;
case EndMarker:
return markerEnd;
}
ASSERT_NOT_REACHED();
return 0;
}
FloatRect RenderSVGShape::markerRect(float strokeWidth) const
{
ASSERT(!m_markerPositions.isEmpty());
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*this);
ASSERT(resources);
RenderSVGResourceMarker* markerStart = resources->markerStart();
RenderSVGResourceMarker* markerMid = resources->markerMid();
RenderSVGResourceMarker* markerEnd = resources->markerEnd();
ASSERT(markerStart || markerMid || markerEnd);
FloatRect boundaries;
unsigned size = m_markerPositions.size();
for (unsigned i = 0; i < size; ++i) {
if (RenderSVGResourceMarker* marker = markerForType(m_markerPositions[i].type, markerStart, markerMid, markerEnd))
boundaries.unite(marker->markerBoundaries(marker->markerTransformation(m_markerPositions[i].origin, m_markerPositions[i].angle, strokeWidth)));
}
return boundaries;
}
FloatRect RenderSVGShape::calculateObjectBoundingBox() const
{
return path().boundingRect();
}
FloatRect RenderSVGShape::calculateStrokeBoundingBox() const
{
ASSERT(m_path);
FloatRect strokeBoundingBox = m_fillBoundingBox;
const SVGRenderStyle& svgStyle = style().svgStyle();
if (svgStyle.hasStroke()) {
BoundingRectStrokeStyleApplier strokeStyle(*this);
if (hasNonScalingStroke()) {
AffineTransform nonScalingTransform = nonScalingStrokeTransform();
if (Optional<AffineTransform> inverse = nonScalingTransform.inverse()) {
Path* usePath = nonScalingStrokePath(m_path.get(), nonScalingTransform);
FloatRect strokeBoundingRect = usePath->strokeBoundingRect(&strokeStyle);
strokeBoundingRect = inverse.value().mapRect(strokeBoundingRect);
strokeBoundingBox.unite(strokeBoundingRect);
}
} else
strokeBoundingBox.unite(path().strokeBoundingRect(&strokeStyle));
}
if (!m_markerPositions.isEmpty())
strokeBoundingBox.unite(markerRect(strokeWidth()));
return strokeBoundingBox;
}
void RenderSVGShape::updateRepaintBoundingBox()
{
m_repaintBoundingBoxExcludingShadow = strokeBoundingBox();
SVGRenderSupport::intersectRepaintRectWithResources(*this, m_repaintBoundingBoxExcludingShadow);
m_repaintBoundingBox = m_repaintBoundingBoxExcludingShadow;
}
float RenderSVGShape::strokeWidth() const
{
SVGLengthContext lengthContext(&graphicsElement());
return lengthContext.valueForLength(style().strokeWidth());
}
bool RenderSVGShape::hasSmoothStroke() const
{
const SVGRenderStyle& svgStyle = style().svgStyle();
return svgStyle.strokeDashArray().isEmpty()
&& style().strokeMiterLimit() == style().initialStrokeMiterLimit()
&& style().joinStyle() == style().initialJoinStyle()
&& style().capStyle() == style().initialCapStyle();
}
void RenderSVGShape::drawMarkers(PaintInfo& paintInfo)
{
ASSERT(!m_markerPositions.isEmpty());
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*this);
if (!resources)
return;
RenderSVGResourceMarker* markerStart = resources->markerStart();
RenderSVGResourceMarker* markerMid = resources->markerMid();
RenderSVGResourceMarker* markerEnd = resources->markerEnd();
if (!markerStart && !markerMid && !markerEnd)
return;
float strokeWidth = this->strokeWidth();
unsigned size = m_markerPositions.size();
for (unsigned i = 0; i < size; ++i) {
if (RenderSVGResourceMarker* marker = markerForType(m_markerPositions[i].type, markerStart, markerMid, markerEnd))
marker->draw(paintInfo, marker->markerTransformation(m_markerPositions[i].origin, m_markerPositions[i].angle, strokeWidth));
}
}
std::unique_ptr<Path> RenderSVGShape::createPath() const
{
return makeUnique<Path>(pathFromGraphicsElement(&graphicsElement()));
}
void RenderSVGShape::processMarkerPositions()
{
m_markerPositions.clear();
if (!shouldGenerateMarkerPositions())
return;
ASSERT(m_path);
SVGMarkerData markerData(m_markerPositions, SVGResourcesCache::cachedResourcesForRenderer(*this)->markerReverseStart());
m_path->apply([&markerData](const PathElement& pathElement) {
SVGMarkerData::updateFromPathElement(markerData, pathElement);
});
markerData.pathIsDone();
}
}