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/*
* Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2009-2010. 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 "SVGRenderSupport.h"
#include "NodeRenderStyle.h"
#include "RenderElement.h"
#include "RenderGeometryMap.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderSVGResourceClipper.h"
#include "RenderSVGResourceFilter.h"
#include "RenderSVGResourceMarker.h"
#include "RenderSVGResourceMasker.h"
#include "RenderSVGRoot.h"
#include "RenderSVGText.h"
#include "RenderSVGViewportContainer.h"
#include "SVGResources.h"
#include "SVGResourcesCache.h"
#include "TransformState.h"
namespace WebCore {
FloatRect SVGRenderSupport::repaintRectForRendererInLocalCoordinatesExcludingSVGShadow(const RenderElement& renderer)
{
// FIXME: Add support for RenderSVGBlock.
if (renderer.isSVGShape() || renderer.isSVGImage() || renderer.isSVGContainer())
return toRenderSVGModelObject(renderer).repaintRectInLocalCoordinatesExcludingSVGShadow();
return renderer.repaintRectInLocalCoordinates();
}
LayoutRect SVGRenderSupport::clippedOverflowRectForRepaint(const RenderElement& renderer, const RenderLayerModelObject* repaintContainer)
{
// Return early for any cases where we don't actually paint
if (renderer.style().visibility() != VISIBLE && !renderer.enclosingLayer()->hasVisibleContent())
return LayoutRect();
// Pass our local paint rect to computeRectForRepaint() which will
// map to parent coords and recurse up the parent chain.
FloatRect repaintRect = repaintRectForRendererInLocalCoordinatesExcludingSVGShadow(renderer);
const SVGRenderStyle& svgStyle = renderer.style().svgStyle();
if (const ShadowData* shadow = svgStyle.shadow())
shadow->adjustRectForShadow(repaintRect);
renderer.computeFloatRectForRepaint(repaintContainer, repaintRect);
return enclosingLayoutRect(repaintRect);
}
void SVGRenderSupport::computeFloatRectForRepaint(const RenderElement& renderer, const RenderLayerModelObject* repaintContainer, FloatRect& repaintRect, bool fixed)
{
const SVGRenderStyle& svgStyle = renderer.style().svgStyle();
if (const ShadowData* shadow = svgStyle.shadow())
shadow->adjustRectForShadow(repaintRect);
repaintRect.inflate(renderer.style().outlineWidth());
// Translate to coords in our parent renderer, and then call computeFloatRectForRepaint() on our parent.
repaintRect = renderer.localToParentTransform().mapRect(repaintRect);
renderer.parent()->computeFloatRectForRepaint(repaintContainer, repaintRect, fixed);
}
void SVGRenderSupport::mapLocalToContainer(const RenderElement& renderer, const RenderLayerModelObject* repaintContainer, TransformState& transformState, bool* wasFixed)
{
ASSERT(renderer.parent());
auto& parent = *renderer.parent();
// At the SVG/HTML boundary (aka RenderSVGRoot), we apply the localToBorderBoxTransform
// to map an element from SVG viewport coordinates to CSS box coordinates.
// RenderSVGRoot's mapLocalToContainer method expects CSS box coordinates.
if (parent.isSVGRoot())
transformState.applyTransform(toRenderSVGRoot(parent).localToBorderBoxTransform());
transformState.applyTransform(renderer.localToParentTransform());
MapCoordinatesFlags mode = UseTransforms;
parent.mapLocalToContainer(repaintContainer, transformState, mode, wasFixed);
}
const RenderElement* SVGRenderSupport::pushMappingToContainer(const RenderElement& renderer, const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap)
{
ASSERT_UNUSED(ancestorToStopAt, ancestorToStopAt != &renderer);
ASSERT(renderer.parent());
auto& parent = *renderer.parent();
// At the SVG/HTML boundary (aka RenderSVGRoot), we apply the localToBorderBoxTransform
// to map an element from SVG viewport coordinates to CSS box coordinates.
// RenderSVGRoot's mapLocalToContainer method expects CSS box coordinates.
if (parent.isSVGRoot()) {
TransformationMatrix matrix(renderer.localToParentTransform());
matrix.multiply(toRenderSVGRoot(parent).localToBorderBoxTransform());
geometryMap.push(&renderer, matrix);
} else
geometryMap.push(&renderer, renderer.localToParentTransform());
return &parent;
}
bool SVGRenderSupport::checkForSVGRepaintDuringLayout(const RenderElement& renderer)
{
if (!renderer.checkForRepaintDuringLayout())
return false;
// When a parent container is transformed in SVG, all children will be painted automatically
// so we are able to skip redundant repaint checks.
auto parent = renderer.parent();
return !(parent && parent->isSVGContainer() && toRenderSVGContainer(parent)->didTransformToRootUpdate());
}
// Update a bounding box taking into account the validity of the other bounding box.
static inline void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, RenderObject* other, FloatRect otherBoundingBox)
{
bool otherValid = other->isSVGContainer() ? toRenderSVGContainer(other)->isObjectBoundingBoxValid() : true;
if (!otherValid)
return;
if (!objectBoundingBoxValid) {
objectBoundingBox = otherBoundingBox;
objectBoundingBoxValid = true;
return;
}
objectBoundingBox.uniteEvenIfEmpty(otherBoundingBox);
}
void SVGRenderSupport::computeContainerBoundingBoxes(const RenderElement& container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox)
{
objectBoundingBox = FloatRect();
objectBoundingBoxValid = false;
strokeBoundingBox = FloatRect();
// When computing the strokeBoundingBox, we use the repaintRects of the container's children so that the container's stroke includes
// the resources applied to the children (such as clips and filters). This allows filters applied to containers to correctly bound
// the children, and also improves inlining of SVG content, as the stroke bound is used in that situation also.
for (RenderObject* current = container.firstChild(); current; current = current->nextSibling()) {
if (current->isSVGHiddenContainer())
continue;
const AffineTransform& transform = current->localToParentTransform();
if (transform.isIdentity()) {
updateObjectBoundingBox(objectBoundingBox, objectBoundingBoxValid, current, current->objectBoundingBox());
strokeBoundingBox.unite(current->repaintRectInLocalCoordinates());
} else {
updateObjectBoundingBox(objectBoundingBox, objectBoundingBoxValid, current, transform.mapRect(current->objectBoundingBox()));
strokeBoundingBox.unite(transform.mapRect(current->repaintRectInLocalCoordinates()));
}
}
repaintBoundingBox = strokeBoundingBox;
}
bool SVGRenderSupport::paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo& paintInfo)
{
if (localTransform.isIdentity())
return localRepaintRect.intersects(paintInfo.rect);
return localTransform.mapRect(localRepaintRect).intersects(paintInfo.rect);
}
const RenderSVGRoot& SVGRenderSupport::findTreeRootObject(const RenderElement& start)
{
return *lineageOfType<RenderSVGRoot>(start).first();
}
static inline void invalidateResourcesOfChildren(RenderElement& renderer)
{
ASSERT(!renderer.needsLayout());
if (SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer))
resources->removeClientFromCache(renderer, false);
for (auto& child : childrenOfType<RenderElement>(renderer))
invalidateResourcesOfChildren(child);
}
static inline bool layoutSizeOfNearestViewportChanged(const RenderElement& renderer)
{
const RenderElement* start = &renderer;
while (start && !start->isSVGRoot() && !start->isSVGViewportContainer())
start = start->parent();
ASSERT(start);
ASSERT(start->isSVGRoot() || start->isSVGViewportContainer());
if (start->isSVGViewportContainer())
return toRenderSVGViewportContainer(start)->isLayoutSizeChanged();
return toRenderSVGRoot(start)->isLayoutSizeChanged();
}
bool SVGRenderSupport::transformToRootChanged(RenderElement* ancestor)
{
while (ancestor && !ancestor->isSVGRoot()) {
if (ancestor->isSVGTransformableContainer())
return toRenderSVGContainer(ancestor)->didTransformToRootUpdate();
if (ancestor->isSVGViewportContainer())
return toRenderSVGViewportContainer(ancestor)->didTransformToRootUpdate();
ancestor = ancestor->parent();
}
return false;
}
void SVGRenderSupport::layoutChildren(RenderElement& start, bool selfNeedsLayout)
{
bool layoutSizeChanged = layoutSizeOfNearestViewportChanged(start);
bool transformChanged = transformToRootChanged(&start);
bool hasSVGShadow = rendererHasSVGShadow(start);
bool needsBoundariesUpdate = start.needsBoundariesUpdate();
HashSet<RenderElement*> elementsThatDidNotReceiveLayout;
for (RenderObject* child = start.firstChild(); child; child = child->nextSibling()) {
bool needsLayout = selfNeedsLayout;
bool childEverHadLayout = child->everHadLayout();
if (needsBoundariesUpdate && hasSVGShadow) {
// If we have a shadow, our shadow is baked into our children's cached boundaries,
// so they need to update.
child->setNeedsBoundariesUpdate();
needsLayout = true;
}
if (transformChanged) {
// If the transform changed we need to update the text metrics (note: this also happens for layoutSizeChanged=true).
if (child->isSVGText())
toRenderSVGText(child)->setNeedsTextMetricsUpdate();
needsLayout = true;
}
if (layoutSizeChanged) {
// When selfNeedsLayout is false and the layout size changed, we have to check whether this child uses relative lengths
if (SVGElement* element = child->node()->isSVGElement() ? toSVGElement(child->node()) : 0) {
if (element->hasRelativeLengths()) {
// When the layout size changed and when using relative values tell the RenderSVGShape to update its shape object
if (child->isSVGShape())
toRenderSVGShape(child)->setNeedsShapeUpdate();
else if (child->isSVGText()) {
toRenderSVGText(child)->setNeedsTextMetricsUpdate();
toRenderSVGText(child)->setNeedsPositioningValuesUpdate();
}
needsLayout = true;
}
}
}
if (needsLayout)
child->setNeedsLayout(MarkOnlyThis);
if (child->needsLayout()) {
toRenderElement(child)->layout();
// Renderers are responsible for repainting themselves when changing, except
// for the initial paint to avoid potential double-painting caused by non-sensical "old" bounds.
// We could handle this in the individual objects, but for now it's easier to have
// parent containers call repaint(). (RenderBlock::layout* has similar logic.)
if (!childEverHadLayout)
child->repaint();
} else if (layoutSizeChanged && child->isRenderElement())
elementsThatDidNotReceiveLayout.add(toRenderElement(child));
ASSERT(!child->needsLayout());
}
if (!layoutSizeChanged) {
ASSERT(elementsThatDidNotReceiveLayout.isEmpty());
return;
}
// If the layout size changed, invalidate all resources of all children that didn't go through the layout() code path.
for (auto* element : elementsThatDidNotReceiveLayout)
invalidateResourcesOfChildren(*element);
}
bool SVGRenderSupport::isOverflowHidden(const RenderElement& renderer)
{
// RenderSVGRoot should never query for overflow state - it should always clip itself to the initial viewport size.
ASSERT(!renderer.isRoot());
return renderer.style().overflowX() == OHIDDEN || renderer.style().overflowX() == OSCROLL;
}
bool SVGRenderSupport::rendererHasSVGShadow(const RenderObject& renderer)
{
// FIXME: Add support for RenderSVGBlock.
if (renderer.isSVGShape() || renderer.isSVGImage() || renderer.isSVGContainer())
return toRenderSVGModelObject(renderer).hasSVGShadow();
if (renderer.isSVGRoot())
return toRenderSVGRoot(renderer).hasSVGShadow();
return false;
}
void SVGRenderSupport::setRendererHasSVGShadow(RenderObject& renderer, bool hasShadow)
{
// FIXME: Add support for RenderSVGBlock.
if (renderer.isSVGShape() || renderer.isSVGImage() || renderer.isSVGContainer()) {
toRenderSVGModelObject(renderer).setHasSVGShadow(hasShadow);
return;
}
if (renderer.isSVGRoot())
toRenderSVGRoot(renderer).setHasSVGShadow(hasShadow);
}
void SVGRenderSupport::intersectRepaintRectWithShadows(const RenderElement& renderer, FloatRect& repaintRect)
{
// Since -webkit-svg-shadow enables shadow drawing for its children, but its children
// don't inherit the shadow in their SVGRenderStyle, we need to search our parents for
// shadows in order to correctly compute our repaint rect.
auto currentObject = &renderer;
AffineTransform localToRootTransform;
while (currentObject && rendererHasSVGShadow(*currentObject)) {
const RenderStyle& style = currentObject->style();
const SVGRenderStyle& svgStyle = style.svgStyle();
if (const ShadowData* shadow = svgStyle.shadow())
shadow->adjustRectForShadow(repaintRect);
repaintRect = currentObject->localToParentTransform().mapRect(repaintRect);
localToRootTransform *= currentObject->localToParentTransform();
currentObject = currentObject->parent();
};
if (localToRootTransform.isIdentity())
return;
AffineTransform rootToLocalTransform = localToRootTransform.inverse();
repaintRect = rootToLocalTransform.mapRect(repaintRect);
}
void SVGRenderSupport::intersectRepaintRectWithResources(const RenderElement& renderer, FloatRect& repaintRect)
{
SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer);
if (!resources)
return;
#if ENABLE(FILTERS)
if (RenderSVGResourceFilter* filter = resources->filter())
repaintRect = filter->resourceBoundingBox(renderer);
#endif
if (RenderSVGResourceClipper* clipper = resources->clipper())
repaintRect.intersect(clipper->resourceBoundingBox(renderer));
if (RenderSVGResourceMasker* masker = resources->masker())
repaintRect.intersect(masker->resourceBoundingBox(renderer));
}
bool SVGRenderSupport::filtersForceContainerLayout(const RenderElement& renderer)
{
// If any of this container's children need to be laid out, and a filter is applied
// to the container, we need to repaint the entire container.
if (!renderer.normalChildNeedsLayout())
return false;
SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer);
if (!resources || !resources->filter())
return false;
return true;
}
bool SVGRenderSupport::pointInClippingArea(const RenderElement& renderer, const FloatPoint& point)
{
// We just take clippers into account to determine if a point is on the node. The Specification may
// change later and we also need to check maskers.
SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer);
if (!resources)
return true;
if (RenderSVGResourceClipper* clipper = resources->clipper())
return clipper->hitTestClipContent(renderer.objectBoundingBox(), point);
return true;
}
void SVGRenderSupport::applyStrokeStyleToContext(GraphicsContext* context, const RenderStyle& style, const RenderElement& renderer)
{
ASSERT(context);
ASSERT(renderer.element());
ASSERT(renderer.element()->isSVGElement());
const SVGRenderStyle& svgStyle = style.svgStyle();
SVGLengthContext lengthContext(toSVGElement(renderer.element()));
context->setStrokeThickness(svgStyle.strokeWidth().value(lengthContext));
context->setLineCap(svgStyle.capStyle());
context->setLineJoin(svgStyle.joinStyle());
if (svgStyle.joinStyle() == MiterJoin)
context->setMiterLimit(svgStyle.strokeMiterLimit());
const Vector<SVGLength>& dashes = svgStyle.strokeDashArray();
if (dashes.isEmpty())
context->setStrokeStyle(SolidStroke);
else {
DashArray dashArray;
dashArray.reserveInitialCapacity(dashes.size());
for (auto& dash : dashes)
dashArray.uncheckedAppend(dash.value(lengthContext));
context->setLineDash(dashArray, svgStyle.strokeDashOffset().value(lengthContext));
}
}
void SVGRenderSupport::childAdded(RenderElement& parent, RenderObject& child)
{
SVGRenderSupport::setRendererHasSVGShadow(child, SVGRenderSupport::rendererHasSVGShadow(parent) || SVGRenderSupport::rendererHasSVGShadow(child));
}
void SVGRenderSupport::styleChanged(RenderElement& renderer, const RenderStyle* oldStyle)
{
auto parent = renderer.parent();
SVGRenderSupport::setRendererHasSVGShadow(renderer, (parent && SVGRenderSupport::rendererHasSVGShadow(*parent)) || renderer.style().svgStyle().shadow());
#if ENABLE(CSS_COMPOSITING)
if (renderer.element() && renderer.element()->isSVGElement() && (!oldStyle || renderer.style().hasBlendMode() != oldStyle->hasBlendMode()))
SVGRenderSupport::updateMaskedAncestorShouldIsolateBlending(renderer);
#else
UNUSED_PARAM(oldStyle);
#endif
}
#if ENABLE(CSS_COMPOSITING)
bool SVGRenderSupport::isolatesBlending(const RenderStyle& style)
{
return style.svgStyle().isolatesBlending() || style.hasBlendMode() || style.opacity() < 1.0f;
}
void SVGRenderSupport::updateMaskedAncestorShouldIsolateBlending(const RenderElement& renderer)
{
ASSERT(renderer.element());
ASSERT(renderer.element()->isSVGElement());
bool maskedAncestorShouldIsolateBlending = renderer.style().hasBlendMode();
for (auto* ancestor = renderer.element()->parentElement(); ancestor && ancestor->isSVGElement(); ancestor = ancestor->parentElement()) {
if (!toSVGElement(ancestor)->isSVGGraphicsElement() || !isolatesBlending(*ancestor->computedStyle()))
continue;
if (ancestor->computedStyle()->svgStyle().hasMasker())
toSVGGraphicsElement(ancestor)->setShouldIsolateBlending(maskedAncestorShouldIsolateBlending);
return;
}
}
#endif
}