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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc.
* Copyright (C) Research In Motion Limited 2011. 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 "RenderSVGRoot.h"
#include "Frame.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "LayoutRepainter.h"
#include "Page.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayoutState.h"
#include "RenderSVGResource.h"
#include "RenderSVGResourceContainer.h"
#include "RenderSVGResourceFilter.h"
#include "RenderTreeBuilder.h"
#include "RenderView.h"
#include "SVGImage.h"
#include "SVGRenderingContext.h"
#include "SVGResources.h"
#include "SVGResourcesCache.h"
#include "SVGSVGElement.h"
#include "SVGViewSpec.h"
#include "TransformState.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/StackStats.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGRoot);
RenderSVGRoot::RenderSVGRoot(SVGSVGElement& element, RenderStyle&& style)
: RenderReplaced(element, WTFMove(style))
, m_objectBoundingBoxValid(false)
, m_isLayoutSizeChanged(false)
, m_needsBoundariesOrTransformUpdate(true)
, m_hasBoxDecorations(false)
{
}
RenderSVGRoot::~RenderSVGRoot() = default;
SVGSVGElement& RenderSVGRoot::svgSVGElement() const
{
return downcast<SVGSVGElement>(nodeForNonAnonymous());
}
void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
// Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
// SVG needs to specify how to calculate some intrinsic sizing properties to enable inclusion within other languages.
// The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including SVG from an ‘object’
// element in HTML styled with CSS. It is possible (indeed, common) for an SVG graphic to have an intrinsic aspect ratio but
// not to have an intrinsic width or height. The intrinsic aspect ratio must be calculated based upon the following rules:
// - The aspect ratio is calculated by dividing a width by a height.
// - If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers (in, mm, cm, pt, pc,
// px, em, ex) or in user units, then the aspect ratio is calculated from the ‘width’ and ‘height’ attributes after
// resolving both values to user units.
intrinsicSize.setWidth(floatValueForLength(svgSVGElement().intrinsicWidth(), 0));
intrinsicSize.setHeight(floatValueForLength(svgSVGElement().intrinsicHeight(), 0));
if (!intrinsicSize.isEmpty())
intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
else {
// - If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted), the
// aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG document
// fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio cannot be
// calculated and is considered unspecified.
FloatSize viewBoxSize = svgSVGElement().viewBox().size();
if (!viewBoxSize.isEmpty()) {
// The viewBox can only yield an intrinsic ratio, not an intrinsic size.
intrinsicRatio = viewBoxSize.width() / static_cast<double>(viewBoxSize.height());
}
}
}
bool RenderSVGRoot::isEmbeddedThroughSVGImage() const
{
return isInSVGImage(&svgSVGElement());
}
bool RenderSVGRoot::isEmbeddedThroughFrameContainingSVGDocument() const
{
// If our frame has an owner renderer, we're embedded through eg. object/embed/iframe,
// but we only negotiate if we're in an SVG document.
if (!frame().ownerRenderer())
return false;
return frame().document()->isSVGDocument();
}
LayoutUnit RenderSVGRoot::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
{
// When we're embedded through SVGImage (border-image/background-image/<html:img>/...) we're forced to resize to a specific size.
if (!m_containerSize.isEmpty())
return m_containerSize.width();
if (isEmbeddedThroughFrameContainingSVGDocument())
return containingBlock()->availableLogicalWidth();
// SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
return RenderReplaced::computeReplacedLogicalWidth(shouldComputePreferred);
}
LayoutUnit RenderSVGRoot::computeReplacedLogicalHeight(Optional<LayoutUnit> estimatedUsedWidth) const
{
// When we're embedded through SVGImage (border-image/background-image/<html:img>/...) we're forced to resize to a specific size.
if (!m_containerSize.isEmpty())
return m_containerSize.height();
if (isEmbeddedThroughFrameContainingSVGDocument())
return containingBlock()->availableLogicalHeight(IncludeMarginBorderPadding);
// SVG embedded via SVGImage (background-image/border-image/etc) / Inline SVG.
return RenderReplaced::computeReplacedLogicalHeight(estimatedUsedWidth);
}
void RenderSVGRoot::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
ASSERT(needsLayout());
m_resourcesNeedingToInvalidateClients.clear();
// Arbitrary affine transforms are incompatible with RenderLayoutState.
LayoutStateDisabler layoutStateDisabler(view().frameView().layoutContext());
bool needsLayout = selfNeedsLayout();
LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);
LayoutSize oldSize = size();
updateLogicalWidth();
updateLogicalHeight();
buildLocalToBorderBoxTransform();
m_isLayoutSizeChanged = needsLayout || (svgSVGElement().hasRelativeLengths() && oldSize != size());
SVGRenderSupport::layoutChildren(*this, needsLayout || SVGRenderSupport::filtersForceContainerLayout(*this));
if (!m_resourcesNeedingToInvalidateClients.isEmpty()) {
// Invalidate resource clients, which may mark some nodes for layout.
for (auto& resource : m_resourcesNeedingToInvalidateClients) {
resource->removeAllClientsFromCache();
SVGResourcesCache::clientStyleChanged(*resource, StyleDifference::Layout, resource->style());
}
m_isLayoutSizeChanged = false;
SVGRenderSupport::layoutChildren(*this, false);
}
// At this point LayoutRepainter already grabbed the old bounds,
// recalculate them now so repaintAfterLayout() uses the new bounds.
if (m_needsBoundariesOrTransformUpdate) {
updateCachedBoundaries();
m_needsBoundariesOrTransformUpdate = false;
}
clearOverflow();
if (!shouldApplyViewportClip()) {
FloatRect contentRepaintRect = repaintRectInLocalCoordinates();
contentRepaintRect = m_localToBorderBoxTransform.mapRect(contentRepaintRect);
addVisualOverflow(enclosingLayoutRect(contentRepaintRect));
}
updateLayerTransform();
m_hasBoxDecorations = isDocumentElementRenderer() ? hasVisibleBoxDecorationStyle() : hasVisibleBoxDecorations();
invalidateBackgroundObscurationStatus();
repainter.repaintAfterLayout();
clearNeedsLayout();
}
bool RenderSVGRoot::shouldApplyViewportClip() const
{
// the outermost svg is clipped if auto, and svg document roots are always clipped
// When the svg is stand-alone (isDocumentElement() == true) the viewport clipping should always
// be applied, noting that the window scrollbars should be hidden if overflow=hidden.
return style().overflowX() == Overflow::Hidden
|| style().overflowX() == Overflow::Auto
|| style().overflowX() == Overflow::Scroll
|| this->isDocumentElementRenderer();
}
void RenderSVGRoot::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
// An empty viewport disables rendering.
if (borderBoxRect().isEmpty())
return;
// Don't paint, if the context explicitly disabled it.
if (paintInfo.context().paintingDisabled())
return;
// SVG outlines are painted during PaintPhase::Foreground.
if (paintInfo.phase == PaintPhase::Outline || paintInfo.phase == PaintPhase::SelfOutline)
return;
// An empty viewBox also disables rendering.
// (http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute)
if (svgSVGElement().hasEmptyViewBox())
return;
// Don't paint if we don't have kids, except if we have filters we should paint those.
if (!firstChild()) {
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*this);
if (!resources || !resources->filter()) {
if (paintInfo.phase == PaintPhase::Foreground)
page().addRelevantUnpaintedObject(this, visualOverflowRect());
return;
}
}
if (paintInfo.phase == PaintPhase::Foreground)
page().addRelevantRepaintedObject(this, visualOverflowRect());
// Make a copy of the PaintInfo because applyTransform will modify the damage rect.
PaintInfo childPaintInfo(paintInfo);
childPaintInfo.context().save();
// Apply initial viewport clip
if (shouldApplyViewportClip())
childPaintInfo.context().clip(snappedIntRect(overflowClipRect(paintOffset)));
// Convert from container offsets (html renderers) to a relative transform (svg renderers).
// Transform from our paint container's coordinate system to our local coords.
IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset);
childPaintInfo.applyTransform(AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()) * localToBorderBoxTransform());
// SVGRenderingContext must be destroyed before we restore the childPaintInfo.context(), because a filter may have
// changed the context and it is only reverted when the SVGRenderingContext destructor finishes applying the filter.
{
SVGRenderingContext renderingContext;
bool continueRendering = true;
if (childPaintInfo.phase == PaintPhase::Foreground) {
renderingContext.prepareToRenderSVGContent(*this, childPaintInfo);
continueRendering = renderingContext.isRenderingPrepared();
}
if (continueRendering) {
childPaintInfo.updateSubtreePaintRootForChildren(this);
for (auto& child : childrenOfType<RenderElement>(*this))
child.paint(childPaintInfo, location());
}
}
childPaintInfo.context().restore();
}
void RenderSVGRoot::willBeDestroyed()
{
RenderBlock::removePercentHeightDescendant(const_cast<RenderSVGRoot&>(*this));
SVGResourcesCache::clientDestroyed(*this);
RenderReplaced::willBeDestroyed();
}
void RenderSVGRoot::insertedIntoTree()
{
RenderReplaced::insertedIntoTree();
SVGResourcesCache::clientWasAddedToTree(*this);
}
void RenderSVGRoot::willBeRemovedFromTree()
{
SVGResourcesCache::clientWillBeRemovedFromTree(*this);
RenderReplaced::willBeRemovedFromTree();
}
void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
if (diff == StyleDifference::Layout)
setNeedsBoundariesUpdate();
// Box decorations may have appeared/disappeared - recompute status.
if (diff == StyleDifference::Repaint)
m_hasBoxDecorations = hasVisibleBoxDecorationStyle();
RenderReplaced::styleDidChange(diff, oldStyle);
SVGResourcesCache::clientStyleChanged(*this, diff, style());
}
// RenderBox methods will expect coordinates w/o any transforms in coordinates
// relative to our borderBox origin. This method gives us exactly that.
void RenderSVGRoot::buildLocalToBorderBoxTransform()
{
float scale = style().effectiveZoom();
FloatPoint translate = svgSVGElement().currentTranslateValue();
LayoutSize borderAndPadding(borderLeft() + paddingLeft(), borderTop() + paddingTop());
m_localToBorderBoxTransform = svgSVGElement().viewBoxToViewTransform(contentWidth() / scale, contentHeight() / scale);
if (borderAndPadding.isZero() && scale == 1 && translate == FloatPoint::zero())
return;
m_localToBorderBoxTransform = AffineTransform(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y()) * m_localToBorderBoxTransform;
}
const AffineTransform& RenderSVGRoot::localToParentTransform() const
{
// Slightly optimized version of m_localToParentTransform = AffineTransform::translation(x(), y()) * m_localToBorderBoxTransform;
m_localToParentTransform = m_localToBorderBoxTransform;
if (x())
m_localToParentTransform.setE(m_localToParentTransform.e() + roundToInt(x()));
if (y())
m_localToParentTransform.setF(m_localToParentTransform.f() + roundToInt(y()));
return m_localToParentTransform;
}
LayoutRect RenderSVGRoot::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
{
if (style().visibility() != Visibility::Visible && !enclosingLayer()->hasVisibleContent())
return LayoutRect();
FloatRect contentRepaintRect = m_localToBorderBoxTransform.mapRect(repaintRectInLocalCoordinates());
contentRepaintRect.intersect(snappedIntRect(borderBoxRect()));
LayoutRect repaintRect = enclosingLayoutRect(contentRepaintRect);
if (m_hasBoxDecorations || hasRenderOverflow())
repaintRect.unite(unionRect(localSelectionRect(false), visualOverflowRect()));
return RenderReplaced::computeRectForRepaint(enclosingIntRect(repaintRect), repaintContainer);
}
Optional<FloatRect> RenderSVGRoot::computeFloatVisibleRectInContainer(const FloatRect& rect, const RenderLayerModelObject* container, VisibleRectContext context) const
{
// Apply our local transforms (except for x/y translation), then our shadow,
// and then call RenderBox's method to handle all the normal CSS Box model bits
FloatRect adjustedRect = m_localToBorderBoxTransform.mapRect(rect);
const SVGRenderStyle& svgStyle = style().svgStyle();
if (const ShadowData* shadow = svgStyle.shadow())
shadow->adjustRectForShadow(adjustedRect);
// Apply initial viewport clip
if (shouldApplyViewportClip()) {
if (context.m_options.contains(VisibleRectContextOption::UseEdgeInclusiveIntersection)) {
if (!adjustedRect.edgeInclusiveIntersect(snappedIntRect(borderBoxRect())))
return WTF::nullopt;
} else
adjustedRect.intersect(snappedIntRect(borderBoxRect()));
}
if (m_hasBoxDecorations || hasRenderOverflow()) {
// The selectionRect can project outside of the overflowRect, so take their union
// for repainting to avoid selection painting glitches.
LayoutRect decoratedRepaintRect = unionRect(localSelectionRect(false), visualOverflowRect());
adjustedRect.unite(decoratedRepaintRect);
}
if (Optional<LayoutRect> rectInContainer = RenderReplaced::computeVisibleRectInContainer(enclosingIntRect(adjustedRect), container, context))
return FloatRect(*rectInContainer);
return WTF::nullopt;
}
// This method expects local CSS box coordinates.
// Callers with local SVG viewport coordinates should first apply the localToBorderBoxTransform
// to convert from SVG viewport coordinates to local CSS box coordinates.
void RenderSVGRoot::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
{
ASSERT(mode & ~IsFixed); // We should have no fixed content in the SVG rendering tree.
ASSERT(mode & UseTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.
RenderReplaced::mapLocalToContainer(repaintContainer, transformState, mode | ApplyContainerFlip, wasFixed);
}
const RenderObject* RenderSVGRoot::pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap) const
{
return RenderReplaced::pushMappingToContainer(ancestorToStopAt, geometryMap);
}
void RenderSVGRoot::updateCachedBoundaries()
{
SVGRenderSupport::computeContainerBoundingBoxes(*this, m_objectBoundingBox, m_objectBoundingBoxValid, m_strokeBoundingBox, m_repaintBoundingBoxExcludingShadow);
SVGRenderSupport::intersectRepaintRectWithResources(*this, m_repaintBoundingBoxExcludingShadow);
m_repaintBoundingBoxExcludingShadow.inflate(horizontalBorderAndPaddingExtent());
m_repaintBoundingBox = m_repaintBoundingBoxExcludingShadow;
}
bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
{
LayoutPoint pointInParent = locationInContainer.point() - toLayoutSize(accumulatedOffset);
LayoutPoint pointInBorderBox = pointInParent - toLayoutSize(location());
// Test SVG content if the point is in our content box or it is inside the visualOverflowRect and the overflow is visible.
// FIXME: This should be an intersection when rect-based hit tests are supported by nodeAtFloatPoint.
if (contentBoxRect().contains(pointInBorderBox) || (!shouldApplyViewportClip() && visualOverflowRect().contains(pointInParent))) {
FloatPoint localPoint = localToParentTransform().inverse().valueOr(AffineTransform()).mapPoint(FloatPoint(pointInParent));
for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
// FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
updateHitTestResult(result, pointInBorderBox);
if (result.addNodeToListBasedTestResult(child->node(), request, locationInContainer) == HitTestProgress::Stop)
return true;
}
}
}
// If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) && visibleToHitTesting()) {
// Only return true here, if the last hit testing phase 'BlockBackground' is executed. If we'd return true in the 'Foreground' phase,
// hit testing would stop immediately. For SVG only trees this doesn't matter. Though when we have a <foreignObject> subtree we need
// to be able to detect hits on the background of a <div> element. If we'd return true here in the 'Foreground' phase, we are not able
// to detect these hits anymore.
LayoutRect boundsRect(accumulatedOffset + location(), size());
if (locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, pointInBorderBox);
if (result.addNodeToListBasedTestResult(&svgSVGElement(), request, locationInContainer, boundsRect) == HitTestProgress::Stop)
return true;
}
}
return false;
}
bool RenderSVGRoot::hasRelativeDimensions() const
{
return svgSVGElement().intrinsicHeight().isPercentOrCalculated() || svgSVGElement().intrinsicWidth().isPercentOrCalculated();
}
void RenderSVGRoot::addResourceForClientInvalidation(RenderSVGResourceContainer* resource)
{
RenderSVGRoot* svgRoot = SVGRenderSupport::findTreeRootObject(*resource);
if (!svgRoot)
return;
svgRoot->m_resourcesNeedingToInvalidateClients.add(resource);
}
}