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webkit / WebKit / 5549cdc34b021e0f42036a79dc545fd3130e6d99 / . / Source / WebCore / rendering / RenderElement.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2013, 2015 Apple Inc. All rights reserved.
* Copyright (C) 2010, 2012 Google Inc. 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 "RenderElement.h"
#include "AXObjectCache.h"
#include "ContentData.h"
#include "CursorList.h"
#include "ElementChildIterator.h"
#include "EventHandler.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLAnchorElement.h"
#include "HTMLBodyElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLImageElement.h"
#include "HTMLNames.h"
#include "Logging.h"
#include "Page.h"
#include "PathUtilities.h"
#include "RenderBlock.h"
#include "RenderChildIterator.h"
#include "RenderCounter.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderDescendantIterator.h"
#include "RenderFlexibleBox.h"
#include "RenderFragmentedFlow.h"
#include "RenderImage.h"
#include "RenderImageResourceStyleImage.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayerCompositor.h"
#include "RenderLineBreak.h"
#include "RenderListItem.h"
#if !ASSERT_DISABLED
#include "RenderListMarker.h"
#endif
#include "RenderFragmentContainer.h"
#include "RenderTableCaption.h"
#include "RenderTableCell.h"
#include "RenderTableCol.h"
#include "RenderTableRow.h"
#include "RenderText.h"
#include "RenderTheme.h"
#include "RenderTreeBuilder.h"
#include "RenderView.h"
#include "SVGImage.h"
#include "SVGRenderSupport.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "StylePendingResources.h"
#include "StyleResolver.h"
#include "TextAutoSizing.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/MathExtras.h>
#include <wtf/StackStats.h>
#include "RenderGrid.h"
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderElement);
struct SameSizeAsRenderElement : public RenderObject {
unsigned bitfields : 25;
void* firstChild;
void* lastChild;
RenderStyle style;
};
static_assert(sizeof(RenderElement) == sizeof(SameSizeAsRenderElement), "RenderElement should stay small");
inline RenderElement::RenderElement(ContainerNode& elementOrDocument, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderObject(elementOrDocument)
, m_baseTypeFlags(baseTypeFlags)
, m_ancestorLineBoxDirty(false)
, m_hasInitializedStyle(false)
, m_renderInlineAlwaysCreatesLineBoxes(false)
, m_renderBoxNeedsLazyRepaint(false)
, m_hasPausedImageAnimations(false)
, m_hasCounterNodeMap(false)
, m_hasContinuationChainNode(false)
, m_isContinuation(false)
, m_isFirstLetter(false)
, m_hasValidCachedFirstLineStyle(false)
, m_renderBlockHasMarginBeforeQuirk(false)
, m_renderBlockHasMarginAfterQuirk(false)
, m_renderBlockShouldForceRelayoutChildren(false)
, m_renderBlockFlowHasMarkupTruncation(false)
, m_renderBlockFlowLineLayoutPath(RenderBlockFlow::UndeterminedPath)
, m_isRegisteredForVisibleInViewportCallback(false)
, m_visibleInViewportState(static_cast<unsigned>(VisibleInViewportState::Unknown))
, m_firstChild(nullptr)
, m_lastChild(nullptr)
, m_style(WTFMove(style))
{
}
RenderElement::RenderElement(Element& element, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderElement(static_cast<ContainerNode&>(element), WTFMove(style), baseTypeFlags)
{
}
RenderElement::RenderElement(Document& document, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderElement(static_cast<ContainerNode&>(document), WTFMove(style), baseTypeFlags)
{
}
RenderElement::~RenderElement()
{
// Do not add any code here. Add it to willBeDestroyed() instead.
ASSERT(!m_firstChild);
}
RenderPtr<RenderElement> RenderElement::createFor(Element& element, RenderStyle&& style, RendererCreationType creationType)
{
// Minimal support for content properties replacing an entire element.
// Works only if we have exactly one piece of content and it's a URL.
// Otherwise acts as if we didn't support this feature.
const ContentData* contentData = style.contentData();
if (creationType == CreateAllRenderers && contentData && !contentData->next() && is<ImageContentData>(*contentData) && !element.isPseudoElement()) {
Style::loadPendingResources(style, element.document(), &element);
auto& styleImage = downcast<ImageContentData>(*contentData).image();
auto image = createRenderer<RenderImage>(element, WTFMove(style), const_cast<StyleImage*>(&styleImage));
image->setIsGeneratedContent();
return WTFMove(image);
}
switch (style.display()) {
case NONE:
case CONTENTS:
return nullptr;
case INLINE:
if (creationType == CreateAllRenderers)
return createRenderer<RenderInline>(element, WTFMove(style));
FALLTHROUGH; // Fieldsets should make a block flow if display:inline is set.
case BLOCK:
case INLINE_BLOCK:
case COMPACT:
return createRenderer<RenderBlockFlow>(element, WTFMove(style));
case LIST_ITEM:
return createRenderer<RenderListItem>(element, WTFMove(style));
case FLEX:
case INLINE_FLEX:
case WEBKIT_FLEX:
case WEBKIT_INLINE_FLEX:
return createRenderer<RenderFlexibleBox>(element, WTFMove(style));
case GRID:
case INLINE_GRID:
return createRenderer<RenderGrid>(element, WTFMove(style));
case BOX:
case INLINE_BOX:
return createRenderer<RenderDeprecatedFlexibleBox>(element, WTFMove(style));
default: {
if (creationType == OnlyCreateBlockAndFlexboxRenderers)
return createRenderer<RenderBlockFlow>(element, WTFMove(style));
switch (style.display()) {
case TABLE:
case INLINE_TABLE:
return createRenderer<RenderTable>(element, WTFMove(style));
case TABLE_CELL:
return createRenderer<RenderTableCell>(element, WTFMove(style));
case TABLE_CAPTION:
return createRenderer<RenderTableCaption>(element, WTFMove(style));
case TABLE_ROW_GROUP:
case TABLE_HEADER_GROUP:
case TABLE_FOOTER_GROUP:
return createRenderer<RenderTableSection>(element, WTFMove(style));
case TABLE_ROW:
return createRenderer<RenderTableRow>(element, WTFMove(style));
case TABLE_COLUMN_GROUP:
case TABLE_COLUMN:
return createRenderer<RenderTableCol>(element, WTFMove(style));
default:
break;
}
break;
}
}
ASSERT_NOT_REACHED();
return nullptr;
}
std::unique_ptr<RenderStyle> RenderElement::computeFirstLineStyle() const
{
ASSERT(view().usesFirstLineRules());
RenderElement& rendererForFirstLineStyle = isBeforeOrAfterContent() ? *parent() : const_cast<RenderElement&>(*this);
if (rendererForFirstLineStyle.isRenderBlockFlow() || rendererForFirstLineStyle.isRenderButton()) {
RenderBlock* firstLineBlock = rendererForFirstLineStyle.firstLineBlock();
if (!firstLineBlock)
return nullptr;
auto* firstLineStyle = firstLineBlock->getCachedPseudoStyle(FIRST_LINE, &style());
if (!firstLineStyle)
return nullptr;
return RenderStyle::clonePtr(*firstLineStyle);
}
if (!rendererForFirstLineStyle.isRenderInline())
return nullptr;
auto& parentStyle = rendererForFirstLineStyle.parent()->firstLineStyle();
if (&parentStyle == &rendererForFirstLineStyle.parent()->style())
return nullptr;
if (rendererForFirstLineStyle.isAnonymous()) {
auto* textRendererWithDisplayContentsParent = RenderText::findByDisplayContentsInlineWrapperCandidate(rendererForFirstLineStyle);
if (!textRendererWithDisplayContentsParent)
return nullptr;
auto* composedTreeParentElement = textRendererWithDisplayContentsParent->textNode()->parentElementInComposedTree();
if (!composedTreeParentElement)
return nullptr;
auto style = composedTreeParentElement->styleResolver().styleForElement(*composedTreeParentElement, &parentStyle).renderStyle;
ASSERT(style->display() == CONTENTS);
// We act as if there was an unstyled <span> around the text node. Only styling happens via inheritance.
auto firstLineStyle = RenderStyle::createPtr();
firstLineStyle->inheritFrom(*style);
return firstLineStyle;
}
return rendererForFirstLineStyle.element()->styleResolver().styleForElement(*element(), &parentStyle).renderStyle;
}
const RenderStyle& RenderElement::firstLineStyle() const
{
if (!view().usesFirstLineRules())
return style();
if (!m_hasValidCachedFirstLineStyle) {
auto firstLineStyle = computeFirstLineStyle();
if (firstLineStyle || hasRareData())
const_cast<RenderElement&>(*this).ensureRareData().cachedFirstLineStyle = WTFMove(firstLineStyle);
m_hasValidCachedFirstLineStyle = true;
}
return (hasRareData() && rareData().cachedFirstLineStyle) ? *rareData().cachedFirstLineStyle : style();
}
StyleDifference RenderElement::adjustStyleDifference(StyleDifference diff, unsigned contextSensitiveProperties) const
{
// If transform changed, and we are not composited, need to do a layout.
if (contextSensitiveProperties & ContextSensitivePropertyTransform) {
// FIXME: when transforms are taken into account for overflow, we will need to do a layout.
if (!hasLayer() || !downcast<RenderLayerModelObject>(*this).layer()->isComposited()) {
if (!hasLayer())
diff = std::max(diff, StyleDifferenceLayout);
else {
// We need to set at least SimplifiedLayout, but if PositionedMovementOnly is already set
// then we actually need SimplifiedLayoutAndPositionedMovement.
diff = std::max(diff, (diff == StyleDifferenceLayoutPositionedMovementOnly) ? StyleDifferenceSimplifiedLayoutAndPositionedMovement : StyleDifferenceSimplifiedLayout);
}
} else
diff = std::max(diff, StyleDifferenceRecompositeLayer);
}
if (contextSensitiveProperties & ContextSensitivePropertyOpacity) {
if (!hasLayer() || !downcast<RenderLayerModelObject>(*this).layer()->isComposited())
diff = std::max(diff, StyleDifferenceRepaintLayer);
else
diff = std::max(diff, StyleDifferenceRecompositeLayer);
}
if (contextSensitiveProperties & ContextSensitivePropertyClipPath) {
if (hasLayer()
&& downcast<RenderLayerModelObject>(*this).layer()->isComposited()
&& hasClipPath()
&& RenderLayerCompositor::canCompositeClipPath(*downcast<RenderLayerModelObject>(*this).layer()))
diff = std::max(diff, StyleDifferenceRecompositeLayer);
else
diff = std::max(diff, StyleDifferenceRepaint);
}
if (contextSensitiveProperties & ContextSensitivePropertyWillChange) {
if (style().willChange() && style().willChange()->canTriggerCompositing())
diff = std::max(diff, StyleDifferenceRecompositeLayer);
}
if ((contextSensitiveProperties & ContextSensitivePropertyFilter) && hasLayer()) {
auto& layer = *downcast<RenderLayerModelObject>(*this).layer();
if (!layer.isComposited() || layer.paintsWithFilters())
diff = std::max(diff, StyleDifferenceRepaintLayer);
else
diff = std::max(diff, StyleDifferenceRecompositeLayer);
}
// The answer to requiresLayer() for plugins, iframes, and canvas can change without the actual
// style changing, since it depends on whether we decide to composite these elements. When the
// layer status of one of these elements changes, we need to force a layout.
if (diff < StyleDifferenceLayout && isRenderLayerModelObject()) {
if (hasLayer() != downcast<RenderLayerModelObject>(*this).requiresLayer())
diff = StyleDifferenceLayout;
}
// If we have no layer(), just treat a RepaintLayer hint as a normal Repaint.
if (diff == StyleDifferenceRepaintLayer && !hasLayer())
diff = StyleDifferenceRepaint;
return diff;
}
inline bool RenderElement::hasImmediateNonWhitespaceTextChildOrBorderOrOutline() const
{
for (auto& child : childrenOfType<RenderObject>(*this)) {
if (is<RenderText>(child) && !downcast<RenderText>(child).isAllCollapsibleWhitespace())
return true;
if (child.style().hasOutline() || child.style().hasBorder())
return true;
}
return false;
}
inline bool RenderElement::shouldRepaintForStyleDifference(StyleDifference diff) const
{
return diff == StyleDifferenceRepaint || (diff == StyleDifferenceRepaintIfTextOrBorderOrOutline && hasImmediateNonWhitespaceTextChildOrBorderOrOutline());
}
void RenderElement::updateFillImages(const FillLayer* oldLayers, const FillLayer& newLayers)
{
// Optimize the common case.
if (FillLayer::imagesIdentical(oldLayers, &newLayers))
return;
// Add before removing, to avoid removing all clients of an image that is in both sets.
for (auto* layer = &newLayers; layer; layer = layer->next()) {
if (layer->image())
layer->image()->addClient(this);
}
for (auto* layer = oldLayers; layer; layer = layer->next()) {
if (layer->image())
layer->image()->removeClient(this);
}
}
void RenderElement::updateImage(StyleImage* oldImage, StyleImage* newImage)
{
if (oldImage == newImage)
return;
if (oldImage)
oldImage->removeClient(this);
if (newImage)
newImage->addClient(this);
}
void RenderElement::updateShapeImage(const ShapeValue* oldShapeValue, const ShapeValue* newShapeValue)
{
if (oldShapeValue || newShapeValue)
updateImage(oldShapeValue ? oldShapeValue->image() : nullptr, newShapeValue ? newShapeValue->image() : nullptr);
}
void RenderElement::initializeStyle()
{
Style::loadPendingResources(m_style, document(), element());
styleWillChange(StyleDifferenceNewStyle, style());
m_hasInitializedStyle = true;
styleDidChange(StyleDifferenceNewStyle, nullptr);
// We shouldn't have any text children that would need styleDidChange at this point.
ASSERT(!childrenOfType<RenderText>(*this).first());
// It would be nice to assert that !parent() here, but some RenderLayer subrenderers
// have their parent set before getting a call to initializeStyle() :|
}
void RenderElement::setStyle(RenderStyle&& style, StyleDifference minimalStyleDifference)
{
// FIXME: Should change RenderView so it can use initializeStyle too.
// If we do that, we can assert m_hasInitializedStyle unconditionally,
// and remove the check of m_hasInitializedStyle below too.
ASSERT(m_hasInitializedStyle || isRenderView());
StyleDifference diff = StyleDifferenceEqual;
unsigned contextSensitiveProperties = ContextSensitivePropertyNone;
if (m_hasInitializedStyle)
diff = m_style.diff(style, contextSensitiveProperties);
diff = std::max(diff, minimalStyleDifference);
diff = adjustStyleDifference(diff, contextSensitiveProperties);
Style::loadPendingResources(style, document(), element());
styleWillChange(diff, style);
auto oldStyle = m_style.replace(WTFMove(style));
bool detachedFromParent = !parent();
// Make sure we invalidate the containing block cache for flows when the contianing block context changes
// so that styleDidChange can safely use RenderBlock::locateEnclosingFragmentedFlow()
if (oldStyle.position() != m_style.position())
adjustFragmentedFlowStateOnContainingBlockChangeIfNeeded();
styleDidChange(diff, &oldStyle);
// Text renderers use their parent style. Notify them about the change.
for (auto& child : childrenOfType<RenderText>(*this))
child.styleDidChange(diff, &oldStyle);
// FIXME: |this| might be destroyed here. This can currently happen for a RenderTextFragment when
// its first-letter block gets an update in RenderTextFragment::styleDidChange. For RenderTextFragment(s),
// we will safely bail out with the detachedFromParent flag. We might want to broaden this condition
// in the future as we move renderer changes out of layout and into style changes.
if (detachedFromParent)
return;
// Now that the layer (if any) has been updated, we need to adjust the diff again,
// check whether we should layout now, and decide if we need to repaint.
StyleDifference updatedDiff = adjustStyleDifference(diff, contextSensitiveProperties);
if (diff <= StyleDifferenceLayoutPositionedMovementOnly) {
if (updatedDiff == StyleDifferenceLayout)
setNeedsLayoutAndPrefWidthsRecalc();
else if (updatedDiff == StyleDifferenceLayoutPositionedMovementOnly)
setNeedsPositionedMovementLayout(&oldStyle);
else if (updatedDiff == StyleDifferenceSimplifiedLayoutAndPositionedMovement) {
setNeedsPositionedMovementLayout(&oldStyle);
setNeedsSimplifiedNormalFlowLayout();
} else if (updatedDiff == StyleDifferenceSimplifiedLayout)
setNeedsSimplifiedNormalFlowLayout();
}
if (updatedDiff == StyleDifferenceRepaintLayer || shouldRepaintForStyleDifference(updatedDiff)) {
// Do a repaint with the new style now, e.g., for example if we go from
// not having an outline to having an outline.
repaint();
}
}
void RenderElement::didAttachChild(RenderObject& child, RenderObject*)
{
if (is<RenderText>(child))
downcast<RenderText>(child).styleDidChange(StyleDifferenceEqual, nullptr);
// SVG creates renderers for <g display="none">, as SVG requires children of hidden
// <g>s to have renderers - at least that's how our implementation works. Consider:
// <g display="none"><foreignObject><body style="position: relative">FOO...
// - requiresLayer() would return true for the <body>, creating a new RenderLayer
// - when the document is painted, both layers are painted. The <body> layer doesn't
// know that it's inside a "hidden SVG subtree", and thus paints, even if it shouldn't.
// To avoid the problem alltogether, detect early if we're inside a hidden SVG subtree
// and stop creating layers at all for these cases - they're not used anyways.
if (child.hasLayer() && !layerCreationAllowedForSubtree())
downcast<RenderLayerModelObject>(child).layer()->removeOnlyThisLayer();
SVGRenderSupport::childAdded(*this, child);
}
RenderObject* RenderElement::attachRendererInternal(RenderPtr<RenderObject> child, RenderObject* beforeChild)
{
child->setParent(this);
if (m_firstChild == beforeChild)
m_firstChild = child.get();
if (beforeChild) {
auto* previousSibling = beforeChild->previousSibling();
if (previousSibling)
previousSibling->setNextSibling(child.get());
child->setPreviousSibling(previousSibling);
child->setNextSibling(beforeChild);
beforeChild->setPreviousSibling(child.get());
return child.release();
}
if (m_lastChild)
m_lastChild->setNextSibling(child.get());
child->setPreviousSibling(m_lastChild);
m_lastChild = child.get();
return child.release();
}
RenderPtr<RenderObject> RenderElement::detachRendererInternal(RenderObject& renderer)
{
auto* parent = renderer.parent();
ASSERT(parent);
auto* nextSibling = renderer.nextSibling();
if (renderer.previousSibling())
renderer.previousSibling()->setNextSibling(nextSibling);
if (nextSibling)
nextSibling->setPreviousSibling(renderer.previousSibling());
if (parent->firstChild() == &renderer)
parent->m_firstChild = nextSibling;
if (parent->lastChild() == &renderer)
parent->m_lastChild = renderer.previousSibling();
renderer.setPreviousSibling(nullptr);
renderer.setNextSibling(nullptr);
renderer.setParent(nullptr);
return RenderPtr<RenderObject>(&renderer);
}
RenderBlock* RenderElement::containingBlockForFixedPosition() const
{
auto* renderer = parent();
while (renderer && !renderer->canContainFixedPositionObjects())
renderer = renderer->parent();
ASSERT(!renderer || !renderer->isAnonymousBlock());
return downcast<RenderBlock>(renderer);
}
RenderBlock* RenderElement::containingBlockForAbsolutePosition() const
{
// A relatively positioned RenderInline forwards its absolute positioned descendants to
// its nearest non-anonymous containing block (to avoid having a positioned objects list in all RenderInlines).
auto* renderer = isRenderInline() ? const_cast<RenderElement*>(downcast<RenderElement>(this)) : parent();
while (renderer && !renderer->canContainAbsolutelyPositionedObjects())
renderer = renderer->parent();
// Make sure we only return non-anonymous RenderBlock as containing block.
while (renderer && (!is<RenderBlock>(*renderer) || renderer->isAnonymousBlock()))
renderer = renderer->containingBlock();
return downcast<RenderBlock>(renderer);
}
static void addLayers(RenderElement& renderer, RenderLayer* parentLayer, RenderElement*& newObject, RenderLayer*& beforeChild)
{
if (renderer.hasLayer()) {
if (!beforeChild && newObject) {
// We need to figure out the layer that follows newObject. We only do
// this the first time we find a child layer, and then we update the
// pointer values for newObject and beforeChild used by everyone else.
beforeChild = newObject->parent()->findNextLayer(parentLayer, newObject);
newObject = nullptr;
}
parentLayer->addChild(downcast<RenderLayerModelObject>(renderer).layer(), beforeChild);
return;
}
for (auto& child : childrenOfType<RenderElement>(renderer))
addLayers(child, parentLayer, newObject, beforeChild);
}
void RenderElement::addLayers(RenderLayer* parentLayer)
{
if (!parentLayer)
return;
RenderElement* renderer = this;
RenderLayer* beforeChild = nullptr;
WebCore::addLayers(*this, parentLayer, renderer, beforeChild);
}
void RenderElement::removeLayers(RenderLayer* parentLayer)
{
if (!parentLayer)
return;
if (hasLayer()) {
parentLayer->removeChild(downcast<RenderLayerModelObject>(*this).layer());
return;
}
for (auto& child : childrenOfType<RenderElement>(*this))
child.removeLayers(parentLayer);
}
void RenderElement::moveLayers(RenderLayer* oldParent, RenderLayer* newParent)
{
if (!newParent)
return;
if (hasLayer()) {
RenderLayer* layer = downcast<RenderLayerModelObject>(*this).layer();
ASSERT(oldParent == layer->parent());
if (oldParent)
oldParent->removeChild(layer);
newParent->addChild(layer);
return;
}
for (auto& child : childrenOfType<RenderElement>(*this))
child.moveLayers(oldParent, newParent);
}
RenderLayer* RenderElement::findNextLayer(RenderLayer* parentLayer, RenderObject* startPoint, bool checkParent)
{
// Error check the parent layer passed in. If it's null, we can't find anything.
if (!parentLayer)
return nullptr;
// Step 1: If our layer is a child of the desired parent, then return our layer.
RenderLayer* ourLayer = hasLayer() ? downcast<RenderLayerModelObject>(*this).layer() : nullptr;
if (ourLayer && ourLayer->parent() == parentLayer)
return ourLayer;
// Step 2: If we don't have a layer, or our layer is the desired parent, then descend
// into our siblings trying to find the next layer whose parent is the desired parent.
if (!ourLayer || ourLayer == parentLayer) {
for (RenderObject* child = startPoint ? startPoint->nextSibling() : firstChild(); child; child = child->nextSibling()) {
if (!is<RenderElement>(*child))
continue;
RenderLayer* nextLayer = downcast<RenderElement>(*child).findNextLayer(parentLayer, nullptr, false);
if (nextLayer)
return nextLayer;
}
}
// Step 3: If our layer is the desired parent layer, then we're finished. We didn't
// find anything.
if (parentLayer == ourLayer)
return nullptr;
// Step 4: If |checkParent| is set, climb up to our parent and check its siblings that
// follow us to see if we can locate a layer.
if (checkParent && parent())
return parent()->findNextLayer(parentLayer, this, true);
return nullptr;
}
bool RenderElement::layerCreationAllowedForSubtree() const
{
RenderElement* parentRenderer = parent();
while (parentRenderer) {
if (parentRenderer->isSVGHiddenContainer())
return false;
parentRenderer = parentRenderer->parent();
}
return true;
}
void RenderElement::propagateStyleToAnonymousChildren(StylePropagationType propagationType)
{
// FIXME: We could save this call when the change only affected non-inherited properties.
for (auto& elementChild : childrenOfType<RenderElement>(*this)) {
if (!elementChild.isAnonymous() || elementChild.style().styleType() != NOPSEUDO)
continue;
if (propagationType == PropagateToBlockChildrenOnly && !is<RenderBlock>(elementChild))
continue;
#if ENABLE(FULLSCREEN_API)
if (elementChild.isRenderFullScreen() || elementChild.isRenderFullScreenPlaceholder())
continue;
#endif
// RenderFragmentedFlows are updated through the RenderView::styleDidChange function.
if (is<RenderFragmentedFlow>(elementChild))
continue;
auto newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), elementChild.style().display());
if (style().specifiesColumns()) {
if (elementChild.style().specifiesColumns())
newStyle.inheritColumnPropertiesFrom(style());
if (elementChild.style().columnSpan())
newStyle.setColumnSpan(ColumnSpanAll);
}
// Preserve the position style of anonymous block continuations as they can have relative or sticky position when
// they contain block descendants of relative or sticky positioned inlines.
if (elementChild.isInFlowPositioned() && elementChild.isContinuation())
newStyle.setPosition(elementChild.style().position());
updateAnonymousChildStyle(newStyle);
elementChild.setStyle(WTFMove(newStyle));
}
}
static inline bool rendererHasBackground(const RenderElement* renderer)
{
return renderer && renderer->hasBackground();
}
void RenderElement::invalidateCachedFirstLineStyle()
{
if (!m_hasValidCachedFirstLineStyle)
return;
m_hasValidCachedFirstLineStyle = false;
// Invalidate the subtree as descendant's first line style may depend on ancestor's.
for (auto& descendant : descendantsOfType<RenderElement>(*this))
descendant.m_hasValidCachedFirstLineStyle = false;
}
void RenderElement::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
auto* oldStyle = hasInitializedStyle() ? &style() : nullptr;
if (oldStyle) {
// If our z-index changes value or our visibility changes,
// we need to dirty our stacking context's z-order list.
bool visibilityChanged = m_style.visibility() != newStyle.visibility()
|| m_style.zIndex() != newStyle.zIndex()
|| m_style.hasAutoZIndex() != newStyle.hasAutoZIndex();
#if ENABLE(DASHBOARD_SUPPORT)
if (visibilityChanged)
document().setAnnotatedRegionsDirty(true);
#endif
#if PLATFORM(IOS) && ENABLE(TOUCH_EVENTS)
if (visibilityChanged)
document().setTouchEventRegionsNeedUpdate();
#endif
if (visibilityChanged) {
if (AXObjectCache* cache = document().existingAXObjectCache())
cache->childrenChanged(parent(), this);
}
// Keep layer hierarchy visibility bits up to date if visibility changes.
if (m_style.visibility() != newStyle.visibility()) {
if (RenderLayer* layer = enclosingLayer()) {
if (newStyle.visibility() == VISIBLE)
layer->setHasVisibleContent();
else if (layer->hasVisibleContent() && (this == &layer->renderer() || layer->renderer().style().visibility() != VISIBLE)) {
layer->dirtyVisibleContentStatus();
if (diff > StyleDifferenceRepaintLayer)
repaint();
}
}
}
if (m_parent && (newStyle.outlineSize() < m_style.outlineSize() || shouldRepaintForStyleDifference(diff)))
repaint();
if (isFloating() && m_style.floating() != newStyle.floating()) {
// For changes in float styles, we need to conceivably remove ourselves
// from the floating objects list.
downcast<RenderBox>(*this).removeFloatingOrPositionedChildFromBlockLists();
} else if (isOutOfFlowPositioned() && m_style.position() != newStyle.position()) {
// For changes in positioning styles, we need to conceivably remove ourselves
// from the positioned objects list.
downcast<RenderBox>(*this).removeFloatingOrPositionedChildFromBlockLists();
}
// reset style flags
if (diff == StyleDifferenceLayout || diff == StyleDifferenceLayoutPositionedMovementOnly) {
setFloating(false);
clearPositionedState();
}
if (newStyle.hasPseudoStyle(FIRST_LINE) || oldStyle->hasPseudoStyle(FIRST_LINE))
invalidateCachedFirstLineStyle();
setHorizontalWritingMode(true);
setHasVisibleBoxDecorations(false);
setHasOverflowClip(false);
setHasTransformRelatedProperty(false);
setHasReflection(false);
}
bool newStyleSlowScroll = false;
if (newStyle.hasFixedBackgroundImage() && !settings().fixedBackgroundsPaintRelativeToDocument()) {
newStyleSlowScroll = true;
bool drawsRootBackground = isDocumentElementRenderer() || (isBody() && !rendererHasBackground(document().documentElement()->renderer()));
if (drawsRootBackground && newStyle.hasEntirelyFixedBackground() && view().compositor().supportsFixedRootBackgroundCompositing())
newStyleSlowScroll = false;
}
if (view().frameView().hasSlowRepaintObject(*this)) {
if (!newStyleSlowScroll)
view().frameView().removeSlowRepaintObject(*this);
} else if (newStyleSlowScroll)
view().frameView().addSlowRepaintObject(*this);
if (isDocumentElementRenderer() || isBody())
view().frameView().updateExtendBackgroundIfNecessary();
}
#if !PLATFORM(IOS)
static bool areNonIdenticalCursorListsEqual(const RenderStyle* a, const RenderStyle* b)
{
ASSERT(a->cursors() != b->cursors());
return a->cursors() && b->cursors() && *a->cursors() == *b->cursors();
}
static inline bool areCursorsEqual(const RenderStyle* a, const RenderStyle* b)
{
return a->cursor() == b->cursor() && (a->cursors() == b->cursors() || areNonIdenticalCursorListsEqual(a, b));
}
#endif
void RenderElement::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
updateFillImages(oldStyle ? &oldStyle->backgroundLayers() : nullptr, m_style.backgroundLayers());
updateFillImages(oldStyle ? &oldStyle->maskLayers() : nullptr, m_style.maskLayers());
updateImage(oldStyle ? oldStyle->borderImage().image() : nullptr, m_style.borderImage().image());
updateImage(oldStyle ? oldStyle->maskBoxImage().image() : nullptr, m_style.maskBoxImage().image());
updateShapeImage(oldStyle ? oldStyle->shapeOutside() : nullptr, m_style.shapeOutside());
SVGRenderSupport::styleChanged(*this, oldStyle);
if (!m_parent)
return;
if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) {
RenderCounter::rendererStyleChanged(*this, oldStyle, &m_style);
// If the object already needs layout, then setNeedsLayout won't do
// any work. But if the containing block has changed, then we may need
// to mark the new containing blocks for layout. The change that can
// directly affect the containing block of this object is a change to
// the position style.
if (needsLayout() && oldStyle->position() != m_style.position())
markContainingBlocksForLayout();
if (diff == StyleDifferenceLayout)
setNeedsLayoutAndPrefWidthsRecalc();
else
setNeedsSimplifiedNormalFlowLayout();
} else if (diff == StyleDifferenceSimplifiedLayoutAndPositionedMovement) {
setNeedsPositionedMovementLayout(oldStyle);
setNeedsSimplifiedNormalFlowLayout();
} else if (diff == StyleDifferenceLayoutPositionedMovementOnly)
setNeedsPositionedMovementLayout(oldStyle);
// Don't check for repaint here; we need to wait until the layer has been
// updated by subclasses before we know if we have to repaint (in setStyle()).
#if !PLATFORM(IOS)
if (oldStyle && !areCursorsEqual(oldStyle, &style()))
frame().eventHandler().scheduleCursorUpdate();
#endif
bool hadOutlineAuto = oldStyle && oldStyle->outlineStyleIsAuto();
bool hasOutlineAuto = outlineStyleForRepaint().outlineStyleIsAuto();
if (hasOutlineAuto != hadOutlineAuto) {
updateOutlineAutoAncestor(hasOutlineAuto);
issueRepaintForOutlineAuto(hasOutlineAuto ? outlineStyleForRepaint().outlineSize() : oldStyle->outlineSize());
}
}
void RenderElement::insertedIntoTree()
{
// Keep our layer hierarchy updated. Optimize for the common case where we don't have any children
// and don't have a layer attached to ourselves.
RenderLayer* layer = nullptr;
if (firstChild() || hasLayer()) {
layer = parent()->enclosingLayer();
addLayers(layer);
}
// If |this| is visible but this object was not, tell the layer it has some visible content
// that needs to be drawn and layer visibility optimization can't be used
if (parent()->style().visibility() != VISIBLE && style().visibility() == VISIBLE && !hasLayer()) {
if (!layer)
layer = parent()->enclosingLayer();
if (layer)
layer->setHasVisibleContent();
}
RenderObject::insertedIntoTree();
}
void RenderElement::willBeRemovedFromTree()
{
// If we remove a visible child from an invisible parent, we don't know the layer visibility any more.
RenderLayer* layer = nullptr;
if (parent()->style().visibility() != VISIBLE && style().visibility() == VISIBLE && !hasLayer()) {
if ((layer = parent()->enclosingLayer()))
layer->dirtyVisibleContentStatus();
}
// Keep our layer hierarchy updated.
if (firstChild() || hasLayer()) {
if (!layer)
layer = parent()->enclosingLayer();
removeLayers(layer);
}
if (isOutOfFlowPositioned() && parent()->childrenInline())
parent()->dirtyLinesFromChangedChild(*this);
RenderObject::willBeRemovedFromTree();
}
inline void RenderElement::clearSubtreeLayoutRootIfNeeded() const
{
if (renderTreeBeingDestroyed())
return;
if (view().frameView().layoutContext().subtreeLayoutRoot() != this)
return;
// Normally when a renderer is detached from the tree, the appropriate dirty bits get set
// which ensures that this renderer is no longer the layout root.
ASSERT_NOT_REACHED();
// This indicates a failure to layout the child, which is why
// the layout root is still set to |this|. Make sure to clear it
// since we are getting destroyed.
view().frameView().layoutContext().clearSubtreeLayoutRoot();
}
void RenderElement::willBeDestroyed()
{
if (m_style.hasFixedBackgroundImage() && !settings().fixedBackgroundsPaintRelativeToDocument())
view().frameView().removeSlowRepaintObject(*this);
unregisterForVisibleInViewportCallback();
if (hasCounterNodeMap())
RenderCounter::destroyCounterNodes(*this);
RenderObject::willBeDestroyed();
clearSubtreeLayoutRootIfNeeded();
if (hasInitializedStyle()) {
for (auto* bgLayer = &m_style.backgroundLayers(); bgLayer; bgLayer = bgLayer->next()) {
if (auto* backgroundImage = bgLayer->image())
backgroundImage->removeClient(this);
}
for (auto* maskLayer = &m_style.maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
if (auto* maskImage = maskLayer->image())
maskImage->removeClient(this);
}
if (auto* borderImage = m_style.borderImage().image())
borderImage->removeClient(this);
if (auto* maskBoxImage = m_style.maskBoxImage().image())
maskBoxImage->removeClient(this);
if (auto shapeValue = m_style.shapeOutside()) {
if (auto shapeImage = shapeValue->image())
shapeImage->removeClient(this);
}
}
if (m_hasPausedImageAnimations)
view().removeRendererWithPausedImageAnimations(*this);
}
void RenderElement::setNeedsPositionedMovementLayout(const RenderStyle* oldStyle)
{
ASSERT(!isSetNeedsLayoutForbidden());
if (needsPositionedMovementLayout())
return;
setNeedsPositionedMovementLayoutBit(true);
markContainingBlocksForLayout();
if (hasLayer()) {
if (oldStyle && style().diffRequiresLayerRepaint(*oldStyle, downcast<RenderLayerModelObject>(*this).layer()->isComposited()))
setLayerNeedsFullRepaint();
else
setLayerNeedsFullRepaintForPositionedMovementLayout();
}
}
void RenderElement::clearChildNeedsLayout()
{
setNormalChildNeedsLayoutBit(false);
setPosChildNeedsLayoutBit(false);
setNeedsSimplifiedNormalFlowLayoutBit(false);
setNormalChildNeedsLayoutBit(false);
setNeedsPositionedMovementLayoutBit(false);
}
void RenderElement::setNeedsSimplifiedNormalFlowLayout()
{
ASSERT(!isSetNeedsLayoutForbidden());
if (needsSimplifiedNormalFlowLayout())
return;
setNeedsSimplifiedNormalFlowLayoutBit(true);
markContainingBlocksForLayout();
if (hasLayer())
setLayerNeedsFullRepaint();
}
RenderElement* RenderElement::hoverAncestor() const
{
return parent();
}
static inline void paintPhase(RenderElement& element, PaintPhase phase, PaintInfo& paintInfo, const LayoutPoint& childPoint)
{
paintInfo.phase = phase;
element.paint(paintInfo, childPoint);
}
void RenderElement::paintAsInlineBlock(PaintInfo& paintInfo, const LayoutPoint& childPoint)
{
// Paint all phases atomically, as though the element established its own stacking context.
// (See Appendix E.2, section 6.4 on inline block/table/replaced elements in the CSS2.1 specification.)
// This is also used by other elements (e.g. flex items and grid items).
PaintPhase paintPhaseToUse = isExcludedAndPlacedInBorder() ? paintInfo.phase : PaintPhaseForeground;
if (paintInfo.phase == PaintPhaseSelection)
paint(paintInfo, childPoint);
else if (paintInfo.phase == paintPhaseToUse) {
paintPhase(*this, PaintPhaseBlockBackground, paintInfo, childPoint);
paintPhase(*this, PaintPhaseChildBlockBackgrounds, paintInfo, childPoint);
paintPhase(*this, PaintPhaseFloat, paintInfo, childPoint);
paintPhase(*this, PaintPhaseForeground, paintInfo, childPoint);
paintPhase(*this, PaintPhaseOutline, paintInfo, childPoint);
// Reset |paintInfo| to the original phase.
paintInfo.phase = paintPhaseToUse;
}
}
void RenderElement::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
ASSERT(needsLayout());
for (auto* child = firstChild(); child; child = child->nextSibling()) {
if (child->needsLayout())
downcast<RenderElement>(*child).layout();
ASSERT(!child->needsLayout());
}
clearNeedsLayout();
}
static bool mustRepaintFillLayers(const RenderElement& renderer, const FillLayer& layer)
{
// Nobody will use multiple layers without wanting fancy positioning.
if (layer.next())
return true;
// Make sure we have a valid image.
auto* image = layer.image();
if (!image || !image->canRender(&renderer, renderer.style().effectiveZoom()))
return false;
if (!layer.xPosition().isZero() || !layer.yPosition().isZero())
return true;
auto sizeType = layer.sizeType();
if (sizeType == Contain || sizeType == Cover)
return true;
if (sizeType == SizeLength) {
auto size = layer.sizeLength();
if (size.width.isPercentOrCalculated() || size.height.isPercentOrCalculated())
return true;
// If the image has neither an intrinsic width nor an intrinsic height, its size is determined as for 'contain'.
if ((size.width.isAuto() || size.height.isAuto()) && image->isGeneratedImage())
return true;
} else if (image->usesImageContainerSize())
return true;
return false;
}
static bool mustRepaintBackgroundOrBorder(const RenderElement& renderer)
{
if (renderer.hasMask() && mustRepaintFillLayers(renderer, renderer.style().maskLayers()))
return true;
// If we don't have a background/border/mask, then nothing to do.
if (!renderer.hasVisibleBoxDecorations())
return false;
if (mustRepaintFillLayers(renderer, renderer.style().backgroundLayers()))
return true;
// Our fill layers are ok. Let's check border.
if (renderer.style().hasBorder() && renderer.borderImageIsLoadedAndCanBeRendered())
return true;
return false;
}
bool RenderElement::repaintAfterLayoutIfNeeded(const RenderLayerModelObject* repaintContainer, const LayoutRect& oldBounds, const LayoutRect& oldOutlineBox, const LayoutRect* newBoundsPtr, const LayoutRect* newOutlineBoxRectPtr)
{
if (view().printing())
return false; // Don't repaint if we're printing.
// This ASSERT fails due to animations. See https://bugs.webkit.org/show_bug.cgi?id=37048
// ASSERT(!newBoundsPtr || *newBoundsPtr == clippedOverflowRectForRepaint(repaintContainer));
LayoutRect newBounds = newBoundsPtr ? *newBoundsPtr : clippedOverflowRectForRepaint(repaintContainer);
LayoutRect newOutlineBox;
bool fullRepaint = selfNeedsLayout();
// Presumably a background or a border exists if border-fit:lines was specified.
if (!fullRepaint && style().borderFit() == BorderFitLines)
fullRepaint = true;
if (!fullRepaint) {
// This ASSERT fails due to animations. See https://bugs.webkit.org/show_bug.cgi?id=37048
// ASSERT(!newOutlineBoxRectPtr || *newOutlineBoxRectPtr == outlineBoundsForRepaint(repaintContainer));
newOutlineBox = newOutlineBoxRectPtr ? *newOutlineBoxRectPtr : outlineBoundsForRepaint(repaintContainer);
fullRepaint = (newOutlineBox.location() != oldOutlineBox.location() || (mustRepaintBackgroundOrBorder(*this) && (newBounds != oldBounds || newOutlineBox != oldOutlineBox)));
}
if (!repaintContainer)
repaintContainer = &view();
if (fullRepaint) {
repaintUsingContainer(repaintContainer, oldBounds);
if (newBounds != oldBounds)
repaintUsingContainer(repaintContainer, newBounds);
return true;
}
if (newBounds == oldBounds && newOutlineBox == oldOutlineBox)
return false;
LayoutUnit deltaLeft = newBounds.x() - oldBounds.x();
if (deltaLeft > 0)
repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), oldBounds.y(), deltaLeft, oldBounds.height()));
else if (deltaLeft < 0)
repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), newBounds.y(), -deltaLeft, newBounds.height()));
LayoutUnit deltaRight = newBounds.maxX() - oldBounds.maxX();
if (deltaRight > 0)
repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.maxX(), newBounds.y(), deltaRight, newBounds.height()));
else if (deltaRight < 0)
repaintUsingContainer(repaintContainer, LayoutRect(newBounds.maxX(), oldBounds.y(), -deltaRight, oldBounds.height()));
LayoutUnit deltaTop = newBounds.y() - oldBounds.y();
if (deltaTop > 0)
repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), oldBounds.y(), oldBounds.width(), deltaTop));
else if (deltaTop < 0)
repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), newBounds.y(), newBounds.width(), -deltaTop));
LayoutUnit deltaBottom = newBounds.maxY() - oldBounds.maxY();
if (deltaBottom > 0)
repaintUsingContainer(repaintContainer, LayoutRect(newBounds.x(), oldBounds.maxY(), newBounds.width(), deltaBottom));
else if (deltaBottom < 0)
repaintUsingContainer(repaintContainer, LayoutRect(oldBounds.x(), newBounds.maxY(), oldBounds.width(), -deltaBottom));
if (newOutlineBox == oldOutlineBox)
return false;
// We didn't move, but we did change size. Invalidate the delta, which will consist of possibly
// two rectangles (but typically only one).
const RenderStyle& outlineStyle = outlineStyleForRepaint();
LayoutUnit outlineWidth = outlineStyle.outlineSize();
LayoutBoxExtent insetShadowExtent = style().getBoxShadowInsetExtent();
LayoutUnit width = absoluteValue(newOutlineBox.width() - oldOutlineBox.width());
if (width) {
LayoutUnit shadowLeft;
LayoutUnit shadowRight;
style().getBoxShadowHorizontalExtent(shadowLeft, shadowRight);
LayoutUnit borderRight = is<RenderBox>(*this) ? downcast<RenderBox>(*this).borderRight() : LayoutUnit::fromPixel(0);
LayoutUnit boxWidth = is<RenderBox>(*this) ? downcast<RenderBox>(*this).width() : LayoutUnit();
LayoutUnit minInsetRightShadowExtent = std::min<LayoutUnit>(-insetShadowExtent.right(), std::min(newBounds.width(), oldBounds.width()));
LayoutUnit borderWidth = std::max(borderRight, std::max(valueForLength(style().borderTopRightRadius().width, boxWidth), valueForLength(style().borderBottomRightRadius().width, boxWidth)));
LayoutUnit decorationsWidth = std::max<LayoutUnit>(-outlineStyle.outlineOffset(), borderWidth + minInsetRightShadowExtent) + std::max(outlineWidth, shadowRight);
LayoutRect rightRect(newOutlineBox.x() + std::min(newOutlineBox.width(), oldOutlineBox.width()) - decorationsWidth,
newOutlineBox.y(),
width + decorationsWidth,
std::max(newOutlineBox.height(), oldOutlineBox.height()));
LayoutUnit right = std::min(newBounds.maxX(), oldBounds.maxX());
if (rightRect.x() < right) {
rightRect.setWidth(std::min(rightRect.width(), right - rightRect.x()));
repaintUsingContainer(repaintContainer, rightRect);
}
}
LayoutUnit height = absoluteValue(newOutlineBox.height() - oldOutlineBox.height());
if (height) {
LayoutUnit shadowTop;
LayoutUnit shadowBottom;
style().getBoxShadowVerticalExtent(shadowTop, shadowBottom);
LayoutUnit borderBottom = is<RenderBox>(*this) ? downcast<RenderBox>(*this).borderBottom() : LayoutUnit::fromPixel(0);
LayoutUnit boxHeight = is<RenderBox>(*this) ? downcast<RenderBox>(*this).height() : LayoutUnit();
LayoutUnit minInsetBottomShadowExtent = std::min<LayoutUnit>(-insetShadowExtent.bottom(), std::min(newBounds.height(), oldBounds.height()));
LayoutUnit borderHeight = std::max(borderBottom, std::max(valueForLength(style().borderBottomLeftRadius().height, boxHeight),
valueForLength(style().borderBottomRightRadius().height, boxHeight)));
LayoutUnit decorationsHeight = std::max<LayoutUnit>(-outlineStyle.outlineOffset(), borderHeight + minInsetBottomShadowExtent) + std::max(outlineWidth, shadowBottom);
LayoutRect bottomRect(newOutlineBox.x(),
std::min(newOutlineBox.maxY(), oldOutlineBox.maxY()) - decorationsHeight,
std::max(newOutlineBox.width(), oldOutlineBox.width()),
height + decorationsHeight);
LayoutUnit bottom = std::min(newBounds.maxY(), oldBounds.maxY());
if (bottomRect.y() < bottom) {
bottomRect.setHeight(std::min(bottomRect.height(), bottom - bottomRect.y()));
repaintUsingContainer(repaintContainer, bottomRect);
}
}
return false;
}
bool RenderElement::borderImageIsLoadedAndCanBeRendered() const
{
ASSERT(style().hasBorder());
StyleImage* borderImage = style().borderImage().image();
return borderImage && borderImage->canRender(this, style().effectiveZoom()) && borderImage->isLoaded();
}
bool RenderElement::mayCauseRepaintInsideViewport(const IntRect* optionalViewportRect) const
{
auto& frameView = view().frameView();
if (frameView.isOffscreen())
return false;
if (!hasOverflowClip()) {
// FIXME: Computing the overflow rect is expensive if any descendant has
// its own self-painting layer. As a result, we prefer to abort early in
// this case and assume it may cause us to repaint inside the viewport.
if (!hasLayer() || downcast<RenderLayerModelObject>(*this).layer()->firstChild())
return true;
}
// Compute viewport rect if it was not provided.
const IntRect& visibleRect = optionalViewportRect ? *optionalViewportRect : frameView.windowToContents(frameView.windowClipRect());
return visibleRect.intersects(enclosingIntRect(absoluteClippedOverflowRect()));
}
bool RenderElement::isVisibleInDocumentRect(const IntRect& documentRect) const
{
if (document().activeDOMObjectsAreSuspended())
return false;
if (style().visibility() != VISIBLE)
return false;
if (view().frameView().isOffscreen())
return false;
// Use background rect if we are the root or if we are the body and the background is propagated to the root.
// FIXME: This is overly conservative as the image may not be a background-image, in which case it will not
// be propagated to the root. At this point, we unfortunately don't have access to the image anymore so we
// can no longer check if it is a background image.
bool backgroundIsPaintedByRoot = isDocumentElementRenderer();
if (isBody()) {
auto& rootRenderer = *parent(); // If <body> has a renderer then <html> does too.
ASSERT(rootRenderer.isDocumentElementRenderer());
ASSERT(is<HTMLHtmlElement>(rootRenderer.element()));
// FIXME: Should share body background propagation code.
backgroundIsPaintedByRoot = !rootRenderer.hasBackground();
}
LayoutRect backgroundPaintingRect = backgroundIsPaintedByRoot ? view().backgroundRect() : absoluteClippedOverflowRect();
if (!documentRect.intersects(enclosingIntRect(backgroundPaintingRect)))
return false;
return true;
}
void RenderElement::registerForVisibleInViewportCallback()
{
if (m_isRegisteredForVisibleInViewportCallback)
return;
m_isRegisteredForVisibleInViewportCallback = true;
view().registerForVisibleInViewportCallback(*this);
}
void RenderElement::unregisterForVisibleInViewportCallback()
{
if (!m_isRegisteredForVisibleInViewportCallback)
return;
m_isRegisteredForVisibleInViewportCallback = false;
view().unregisterForVisibleInViewportCallback(*this);
}
void RenderElement::setVisibleInViewportState(VisibleInViewportState state)
{
if (state == visibleInViewportState())
return;
m_visibleInViewportState = static_cast<unsigned>(state);
visibleInViewportStateChanged();
}
void RenderElement::visibleInViewportStateChanged()
{
ASSERT_NOT_REACHED();
}
bool RenderElement::isVisibleInViewport() const
{
auto& frameView = view().frameView();
auto visibleRect = frameView.windowToContents(frameView.windowClipRect());
return isVisibleInDocumentRect(visibleRect);
}
VisibleInViewportState RenderElement::imageFrameAvailable(CachedImage& image, ImageAnimatingState animatingState, const IntRect* changeRect)
{
bool isVisible = isVisibleInViewport();
if (!isVisible && animatingState == ImageAnimatingState::Yes)
view().addRendererWithPausedImageAnimations(*this, image);
// Static images should repaint even if they are outside the viewport rectangle
// because they should be inside the TileCoverageRect.
if (isVisible || animatingState == ImageAnimatingState::No)
imageChanged(&image, changeRect);
if (element() && image.image()->isBitmapImage())
element()->dispatchWebKitImageReadyEventForTesting();
return isVisible ? VisibleInViewportState::Yes : VisibleInViewportState::No;
}
void RenderElement::didRemoveCachedImageClient(CachedImage& cachedImage)
{
if (hasPausedImageAnimations())
view().removeRendererWithPausedImageAnimations(*this, cachedImage);
}
bool RenderElement::repaintForPausedImageAnimationsIfNeeded(const IntRect& visibleRect, CachedImage& cachedImage)
{
ASSERT(m_hasPausedImageAnimations);
if (!isVisibleInDocumentRect(visibleRect))
return false;
repaint();
if (auto* image = cachedImage.image()) {
if (is<SVGImage>(image))
downcast<SVGImage>(image)->scheduleStartAnimation();
else
image->startAnimation();
}
// For directly-composited animated GIFs it does not suffice to call repaint() to resume animation. We need to mark the image as changed.
if (is<RenderBoxModelObject>(*this))
downcast<RenderBoxModelObject>(*this).contentChanged(ImageChanged);
return true;
}
const RenderStyle* RenderElement::getCachedPseudoStyle(PseudoId pseudo, const RenderStyle* parentStyle) const
{
if (pseudo < FIRST_INTERNAL_PSEUDOID && !style().hasPseudoStyle(pseudo))
return nullptr;
RenderStyle* cachedStyle = style().getCachedPseudoStyle(pseudo);
if (cachedStyle)
return cachedStyle;
std::unique_ptr<RenderStyle> result = getUncachedPseudoStyle(PseudoStyleRequest(pseudo), parentStyle);
if (result)
return const_cast<RenderStyle&>(m_style).addCachedPseudoStyle(WTFMove(result));
return nullptr;
}
std::unique_ptr<RenderStyle> RenderElement::getUncachedPseudoStyle(const PseudoStyleRequest& pseudoStyleRequest, const RenderStyle* parentStyle, const RenderStyle* ownStyle) const
{
if (pseudoStyleRequest.pseudoId < FIRST_INTERNAL_PSEUDOID && !ownStyle && !style().hasPseudoStyle(pseudoStyleRequest.pseudoId))
return nullptr;
if (!parentStyle) {
ASSERT(!ownStyle);
parentStyle = &style();
}
if (isAnonymous())
return nullptr;
auto& styleResolver = element()->styleResolver();
std::unique_ptr<RenderStyle> style = styleResolver.pseudoStyleForElement(*element(), pseudoStyleRequest, *parentStyle);
if (style)
Style::loadPendingResources(*style, document(), element());
return style;
}
Color RenderElement::selectionColor(int colorProperty) const
{
// If the element is unselectable, or we are only painting the selection,
// don't override the foreground color with the selection foreground color.
if (style().userSelect() == SELECT_NONE
|| (view().frameView().paintBehavior() & (PaintBehaviorSelectionOnly | PaintBehaviorSelectionAndBackgroundsOnly)))
return Color();
if (std::unique_ptr<RenderStyle> pseudoStyle = selectionPseudoStyle()) {
Color color = pseudoStyle->visitedDependentColor(colorProperty);
if (!color.isValid())
color = pseudoStyle->visitedDependentColor(CSSPropertyColor);
return color;
}
if (frame().selection().isFocusedAndActive())
return theme().activeSelectionForegroundColor();
return theme().inactiveSelectionForegroundColor();
}
std::unique_ptr<RenderStyle> RenderElement::selectionPseudoStyle() const
{
if (isAnonymous())
return nullptr;
if (ShadowRoot* root = element()->containingShadowRoot()) {
if (root->mode() == ShadowRootMode::UserAgent) {
if (Element* shadowHost = element()->shadowHost())
return shadowHost->renderer()->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
}
}
return getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
}
Color RenderElement::selectionForegroundColor() const
{
return selectionColor(CSSPropertyWebkitTextFillColor);
}
Color RenderElement::selectionEmphasisMarkColor() const
{
return selectionColor(CSSPropertyWebkitTextEmphasisColor);
}
Color RenderElement::selectionBackgroundColor() const
{
if (style().userSelect() == SELECT_NONE)
return Color();
if (frame().selection().shouldShowBlockCursor() && frame().selection().isCaret())
return style().visitedDependentColor(CSSPropertyColor).blendWithWhite();
std::unique_ptr<RenderStyle> pseudoStyle = selectionPseudoStyle();
if (pseudoStyle && pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).isValid())
return pseudoStyle->visitedDependentColor(CSSPropertyBackgroundColor).blendWithWhite();
if (frame().selection().isFocusedAndActive())
return theme().activeSelectionBackgroundColor();
return theme().inactiveSelectionBackgroundColor();
}
bool RenderElement::getLeadingCorner(FloatPoint& point, bool& insideFixed) const
{
if (!isInline() || isReplaced()) {
point = localToAbsolute(FloatPoint(), UseTransforms, &insideFixed);
return true;
}
// find the next text/image child, to get a position
const RenderObject* o = this;
while (o) {
const RenderObject* p = o;
if (RenderObject* child = o->firstChildSlow())
o = child;
else if (o->nextSibling())
o = o->nextSibling();
else {
RenderObject* next = 0;
while (!next && o->parent()) {
o = o->parent();
next = o->nextSibling();
}
o = next;
if (!o)
break;
}
ASSERT(o);
if (!o->isInline() || o->isReplaced()) {
point = o->localToAbsolute(FloatPoint(), UseTransforms, &insideFixed);
return true;
}
if (p->node() && p->node() == element() && is<RenderText>(*o) && !downcast<RenderText>(*o).firstTextBox()) {
// do nothing - skip unrendered whitespace that is a child or next sibling of the anchor
} else if (is<RenderText>(*o) || o->isReplaced()) {
point = FloatPoint();
if (is<RenderText>(*o) && downcast<RenderText>(*o).firstTextBox())
point.move(downcast<RenderText>(*o).linesBoundingBox().x(), downcast<RenderText>(*o).topOfFirstText());
else if (is<RenderBox>(*o))
point.moveBy(downcast<RenderBox>(*o).location());
point = o->container()->localToAbsolute(point, UseTransforms, &insideFixed);
return true;
}
}
// If the target doesn't have any children or siblings that could be used to calculate the scroll position, we must be
// at the end of the document. Scroll to the bottom. FIXME: who said anything about scrolling?
if (!o && document().view()) {
point = FloatPoint(0, document().view()->contentsHeight());
return true;
}
return false;
}
bool RenderElement::getTrailingCorner(FloatPoint& point, bool& insideFixed) const
{
if (!isInline() || isReplaced()) {
point = localToAbsolute(LayoutPoint(downcast<RenderBox>(*this).size()), UseTransforms, &insideFixed);
return true;
}
// find the last text/image child, to get a position
const RenderObject* o = this;
while (o) {
if (RenderObject* child = o->lastChildSlow())
o = child;
else if (o->previousSibling())
o = o->previousSibling();
else {
RenderObject* prev = 0;
while (!prev) {
o = o->parent();
if (!o)
return false;
prev = o->previousSibling();
}
o = prev;
}
ASSERT(o);
if (is<RenderText>(*o) || o->isReplaced()) {
point = FloatPoint();
if (is<RenderText>(*o)) {
LayoutRect linesBox = downcast<RenderText>(*o).linesBoundingBox();
if (!linesBox.maxX() && !linesBox.maxY())
continue;
point.moveBy(linesBox.maxXMaxYCorner());
} else
point.moveBy(downcast<RenderBox>(*o).frameRect().maxXMaxYCorner());
point = o->container()->localToAbsolute(point, UseTransforms, &insideFixed);
return true;
}
}
return true;
}
LayoutRect RenderElement::absoluteAnchorRect(bool* insideFixed) const
{
FloatPoint leading, trailing;
bool leadingInFixed = false;
bool trailingInFixed = false;
getLeadingCorner(leading, leadingInFixed);
getTrailingCorner(trailing, trailingInFixed);
FloatPoint upperLeft = leading;
FloatPoint lowerRight = trailing;
// Vertical writing modes might mean the leading point is not in the top left
if (!isInline() || isReplaced()) {
upperLeft = FloatPoint(std::min(leading.x(), trailing.x()), std::min(leading.y(), trailing.y()));
lowerRight = FloatPoint(std::max(leading.x(), trailing.x()), std::max(leading.y(), trailing.y()));
} // Otherwise, it's not obvious what to do.
if (insideFixed) {
// For now, just look at the leading corner. Handling one inside fixed and one not would be tricky.
*insideFixed = leadingInFixed;
}
return enclosingLayoutRect(FloatRect(upperLeft, lowerRight.expandedTo(upperLeft) - upperLeft));
}
const RenderElement* RenderElement::enclosingRendererWithTextDecoration(TextDecoration textDecoration, bool firstLine) const
{
const RenderElement* current = this;
do {
if (current->isRenderBlock())
return current;
if (!current->isRenderInline() || current->isRubyText())
return nullptr;
const RenderStyle& styleToUse = firstLine ? current->firstLineStyle() : current->style();
if (styleToUse.textDecoration() & textDecoration)
return current;
current = current->parent();
} while (current && (!current->element() || (!is<HTMLAnchorElement>(*current->element()) && !current->element()->hasTagName(HTMLNames::fontTag))));
return current;
}
void RenderElement::drawLineForBoxSide(GraphicsContext& graphicsContext, const FloatRect& rect, BoxSide side, Color color, EBorderStyle borderStyle, float adjacentWidth1, float adjacentWidth2, bool antialias) const
{
auto drawBorderRect = [&graphicsContext] (const FloatRect& rect)
{
if (rect.isEmpty())
return;
graphicsContext.drawRect(rect);
};
auto drawLineFor = [this, &graphicsContext, color, antialias] (const FloatRect& rect, BoxSide side, EBorderStyle borderStyle, const FloatSize& adjacent)
{
if (rect.isEmpty())
return;
drawLineForBoxSide(graphicsContext, rect, side, color, borderStyle, adjacent.width(), adjacent.height(), antialias);
};
float x1 = rect.x();
float x2 = rect.maxX();
float y1 = rect.y();
float y2 = rect.maxY();
float thickness;
float length;
if (side == BSTop || side == BSBottom) {
thickness = y2 - y1;
length = x2 - x1;
} else {
thickness = x2 - x1;
length = y2 - y1;
}
// FIXME: We really would like this check to be an ASSERT as we don't want to draw empty borders. However
// nothing guarantees that the following recursive calls to drawLineForBoxSide will have non-null dimensions.
if (!thickness || !length)
return;
float deviceScaleFactor = document().deviceScaleFactor();
if (borderStyle == DOUBLE && (thickness * deviceScaleFactor) < 3)
borderStyle = SOLID;
switch (borderStyle) {
case BNONE:
case BHIDDEN:
return;
case DOTTED:
case DASHED: {
bool wasAntialiased = graphicsContext.shouldAntialias();
StrokeStyle oldStrokeStyle = graphicsContext.strokeStyle();
graphicsContext.setShouldAntialias(antialias);
graphicsContext.setStrokeColor(color);
graphicsContext.setStrokeThickness(thickness);
graphicsContext.setStrokeStyle(borderStyle == DASHED ? DashedStroke : DottedStroke);
graphicsContext.drawLine(roundPointToDevicePixels(LayoutPoint(x1, y1), deviceScaleFactor), roundPointToDevicePixels(LayoutPoint(x2, y2), deviceScaleFactor));
graphicsContext.setShouldAntialias(wasAntialiased);
graphicsContext.setStrokeStyle(oldStrokeStyle);
break;
}
case DOUBLE: {
float thirdOfThickness = ceilToDevicePixel(thickness / 3, deviceScaleFactor);
ASSERT(thirdOfThickness);
if (!adjacentWidth1 && !adjacentWidth2) {
StrokeStyle oldStrokeStyle = graphicsContext.strokeStyle();
graphicsContext.setStrokeStyle(NoStroke);
graphicsContext.setFillColor(color);
bool wasAntialiased = graphicsContext.shouldAntialias();
graphicsContext.setShouldAntialias(antialias);
switch (side) {
case BSTop:
case BSBottom:
drawBorderRect(snapRectToDevicePixels(x1, y1, length, thirdOfThickness, deviceScaleFactor));
drawBorderRect(snapRectToDevicePixels(x1, y2 - thirdOfThickness, length, thirdOfThickness, deviceScaleFactor));
break;
case BSLeft:
case BSRight:
drawBorderRect(snapRectToDevicePixels(x1, y1, thirdOfThickness, length, deviceScaleFactor));
drawBorderRect(snapRectToDevicePixels(x2 - thirdOfThickness, y1, thirdOfThickness, length, deviceScaleFactor));
break;
}
graphicsContext.setShouldAntialias(wasAntialiased);
graphicsContext.setStrokeStyle(oldStrokeStyle);
} else {
float adjacent1BigThird = ceilToDevicePixel(adjacentWidth1 / 3, deviceScaleFactor);
float adjacent2BigThird = ceilToDevicePixel(adjacentWidth2 / 3, deviceScaleFactor);
float offset1 = floorToDevicePixel(fabs(adjacentWidth1) * 2 / 3, deviceScaleFactor);
float offset2 = floorToDevicePixel(fabs(adjacentWidth2) * 2 / 3, deviceScaleFactor);
float mitreOffset1 = adjacentWidth1 < 0 ? offset1 : 0;
float mitreOffset2 = adjacentWidth1 > 0 ? offset1 : 0;
float mitreOffset3 = adjacentWidth2 < 0 ? offset2 : 0;
float mitreOffset4 = adjacentWidth2 > 0 ? offset2 : 0;
FloatRect paintBorderRect;
switch (side) {
case BSTop:
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1 + mitreOffset1, y1, (x2 - mitreOffset3) - (x1 + mitreOffset1), thirdOfThickness), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1 + mitreOffset2, y2 - thirdOfThickness, (x2 - mitreOffset4) - (x1 + mitreOffset2), thirdOfThickness), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
break;
case BSLeft:
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1, y1 + mitreOffset1, thirdOfThickness, (y2 - mitreOffset3) - (y1 + mitreOffset1)), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
paintBorderRect = snapRectToDevicePixels(LayoutRect(x2 - thirdOfThickness, y1 + mitreOffset2, thirdOfThickness, (y2 - mitreOffset4) - (y1 + mitreOffset2)), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
break;
case BSBottom:
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1 + mitreOffset2, y1, (x2 - mitreOffset4) - (x1 + mitreOffset2), thirdOfThickness), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1 + mitreOffset1, y2 - thirdOfThickness, (x2 - mitreOffset3) - (x1 + mitreOffset1), thirdOfThickness), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
break;
case BSRight:
paintBorderRect = snapRectToDevicePixels(LayoutRect(x1, y1 + mitreOffset2, thirdOfThickness, (y2 - mitreOffset4) - (y1 + mitreOffset2)), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
paintBorderRect = snapRectToDevicePixels(LayoutRect(x2 - thirdOfThickness, y1 + mitreOffset1, thirdOfThickness, (y2 - mitreOffset3) - (y1 + mitreOffset1)), deviceScaleFactor);
drawLineFor(paintBorderRect, side, SOLID, FloatSize(adjacent1BigThird, adjacent2BigThird));
break;
default:
break;
}
}
break;
}
case RIDGE:
case GROOVE: {
EBorderStyle s1;
EBorderStyle s2;
if (borderStyle == GROOVE) {
s1 = INSET;
s2 = OUTSET;
} else {
s1 = OUTSET;
s2 = INSET;
}
float adjacent1BigHalf = ceilToDevicePixel(adjacentWidth1 / 2, deviceScaleFactor);
float adjacent2BigHalf = ceilToDevicePixel(adjacentWidth2 / 2, deviceScaleFactor);
float adjacent1SmallHalf = floorToDevicePixel(adjacentWidth1 / 2, deviceScaleFactor);
float adjacent2SmallHalf = floorToDevicePixel(adjacentWidth2 / 2, deviceScaleFactor);
float offset1 = 0;
float offset2 = 0;
float offset3 = 0;
float offset4 = 0;
if (((side == BSTop || side == BSLeft) && adjacentWidth1 < 0) || ((side == BSBottom || side == BSRight) && adjacentWidth1 > 0))
offset1 = floorToDevicePixel(adjacentWidth1 / 2, deviceScaleFactor);
if (((side == BSTop || side == BSLeft) && adjacentWidth2 < 0) || ((side == BSBottom || side == BSRight) && adjacentWidth2 > 0))
offset2 = ceilToDevicePixel(adjacentWidth2 / 2, deviceScaleFactor);
if (((side == BSTop || side == BSLeft) && adjacentWidth1 > 0) || ((side == BSBottom || side == BSRight) && adjacentWidth1 < 0))
offset3 = floorToDevicePixel(fabs(adjacentWidth1) / 2, deviceScaleFactor);
if (((side == BSTop || side == BSLeft) && adjacentWidth2 > 0) || ((side == BSBottom || side == BSRight) && adjacentWidth2 < 0))
offset4 = ceilToDevicePixel(adjacentWidth2 / 2, deviceScaleFactor);
float adjustedX = ceilToDevicePixel((x1 + x2) / 2, deviceScaleFactor);
float adjustedY = ceilToDevicePixel((y1 + y2) / 2, deviceScaleFactor);
// Quads can't use the default snapping rect functions.
x1 = roundToDevicePixel(x1, deviceScaleFactor);
x2 = roundToDevicePixel(x2, deviceScaleFactor);
y1 = roundToDevicePixel(y1, deviceScaleFactor);
y2 = roundToDevicePixel(y2, deviceScaleFactor);
switch (side) {
case BSTop:
drawLineFor(FloatRect(FloatPoint(x1 + offset1, y1), FloatPoint(x2 - offset2, adjustedY)), side, s1, FloatSize(adjacent1BigHalf, adjacent2BigHalf));
drawLineFor(FloatRect(FloatPoint(x1 + offset3, adjustedY), FloatPoint(x2 - offset4, y2)), side, s2, FloatSize(adjacent1SmallHalf, adjacent2SmallHalf));
break;
case BSLeft:
drawLineFor(FloatRect(FloatPoint(x1, y1 + offset1), FloatPoint(adjustedX, y2 - offset2)), side, s1, FloatSize(adjacent1BigHalf, adjacent2BigHalf));
drawLineFor(FloatRect(FloatPoint(adjustedX, y1 + offset3), FloatPoint(x2, y2 - offset4)), side, s2, FloatSize(adjacent1SmallHalf, adjacent2SmallHalf));
break;
case BSBottom:
drawLineFor(FloatRect(FloatPoint(x1 + offset1, y1), FloatPoint(x2 - offset2, adjustedY)), side, s2, FloatSize(adjacent1BigHalf, adjacent2BigHalf));
drawLineFor(FloatRect(FloatPoint(x1 + offset3, adjustedY), FloatPoint(x2 - offset4, y2)), side, s1, FloatSize(adjacent1SmallHalf, adjacent2SmallHalf));
break;
case BSRight:
drawLineFor(FloatRect(FloatPoint(x1, y1 + offset1), FloatPoint(adjustedX, y2 - offset2)), side, s2, FloatSize(adjacent1BigHalf, adjacent2BigHalf));
drawLineFor(FloatRect(FloatPoint(adjustedX, y1 + offset3), FloatPoint(x2, y2 - offset4)), side, s1, FloatSize(adjacent1SmallHalf, adjacent2SmallHalf));
break;
}
break;
}
case INSET:
case OUTSET:
calculateBorderStyleColor(borderStyle, side, color);
FALLTHROUGH;
case SOLID: {
StrokeStyle oldStrokeStyle = graphicsContext.strokeStyle();
ASSERT(x2 >= x1);
ASSERT(y2 >= y1);
if (!adjacentWidth1 && !adjacentWidth2) {
graphicsContext.setStrokeStyle(NoStroke);
graphicsContext.setFillColor(color);
bool wasAntialiased = graphicsContext.shouldAntialias();
graphicsContext.setShouldAntialias(antialias);
drawBorderRect(snapRectToDevicePixels(x1, y1, x2 - x1, y2 - y1, deviceScaleFactor));
graphicsContext.setShouldAntialias(wasAntialiased);
graphicsContext.setStrokeStyle(oldStrokeStyle);
return;
}
// FIXME: These roundings should be replaced by ASSERT(device pixel positioned) when all the callers have transitioned to device pixels.
x1 = roundToDevicePixel(x1, deviceScaleFactor);
y1 = roundToDevicePixel(y1, deviceScaleFactor);
x2 = roundToDevicePixel(x2, deviceScaleFactor);
y2 = roundToDevicePixel(y2, deviceScaleFactor);
Vector<FloatPoint> quad;
quad.reserveInitialCapacity(4);
switch (side) {
case BSTop:
quad.uncheckedAppend({ x1 + std::max<float>(-adjacentWidth1, 0), y1 });
quad.uncheckedAppend({ x1 + std::max<float>( adjacentWidth1, 0), y2 });
quad.uncheckedAppend({ x2 - std::max<float>( adjacentWidth2, 0), y2 });
quad.uncheckedAppend({ x2 - std::max<float>(-adjacentWidth2, 0), y1 });
break;
case BSBottom:
quad.uncheckedAppend({ x1 + std::max<float>( adjacentWidth1, 0), y1 });
quad.uncheckedAppend({ x1 + std::max<float>(-adjacentWidth1, 0), y2 });
quad.uncheckedAppend({ x2 - std::max<float>(-adjacentWidth2, 0), y2 });
quad.uncheckedAppend({ x2 - std::max<float>( adjacentWidth2, 0), y1 });
break;
case BSLeft:
quad.uncheckedAppend({ x1, y1 + std::max<float>(-adjacentWidth1, 0) });
quad.uncheckedAppend({ x1, y2 - std::max<float>(-adjacentWidth2, 0) });
quad.uncheckedAppend({ x2, y2 - std::max<float>( adjacentWidth2, 0) });
quad.uncheckedAppend({ x2, y1 + std::max<float>( adjacentWidth1, 0) });
break;
case BSRight:
quad.uncheckedAppend({ x1, y1 + std::max<float>( adjacentWidth1, 0) });
quad.uncheckedAppend({ x1, y2 - std::max<float>( adjacentWidth2, 0) });
quad.uncheckedAppend({ x2, y2 - std::max<float>(-adjacentWidth2, 0) });
quad.uncheckedAppend({ x2, y1 + std::max<float>(-adjacentWidth1, 0) });
break;
}
graphicsContext.setStrokeStyle(NoStroke);
graphicsContext.setFillColor(color);
bool wasAntialiased = graphicsContext.shouldAntialias();
graphicsContext.setShouldAntialias(antialias);
graphicsContext.fillPath(Path::polygonPathFromPoints(quad));
graphicsContext.setShouldAntialias(wasAntialiased);
graphicsContext.setStrokeStyle(oldStrokeStyle);
break;
}
}
}
void RenderElement::paintFocusRing(PaintInfo& paintInfo, const RenderStyle& style, const Vector<LayoutRect>& focusRingRects)
{
ASSERT(style.outlineStyleIsAuto());
float outlineOffset = style.outlineOffset();
Vector<FloatRect> pixelSnappedFocusRingRects;
float deviceScaleFactor = document().deviceScaleFactor();
for (auto rect : focusRingRects) {
rect.inflate(outlineOffset);
pixelSnappedFocusRingRects.append(snapRectToDevicePixels(rect, deviceScaleFactor));
}
#if PLATFORM(MAC)
bool needsRepaint;
if (style.hasBorderRadius()) {
Path path = PathUtilities::pathWithShrinkWrappedRectsForOutline(pixelSnappedFocusRingRects, style.border(), outlineOffset, style.direction(), style.writingMode(),
document().deviceScaleFactor());
if (path.isEmpty()) {
for (auto rect : pixelSnappedFocusRingRects)
path.addRect(rect);
}
paintInfo.context().drawFocusRing(path, page().focusController().timeSinceFocusWasSet().seconds(), needsRepaint);
} else
paintInfo.context().drawFocusRing(pixelSnappedFocusRingRects, page().focusController().timeSinceFocusWasSet().seconds(), needsRepaint);
if (needsRepaint)
page().focusController().setFocusedElementNeedsRepaint();
#else
paintInfo.context().drawFocusRing(pixelSnappedFocusRingRects, style.outlineWidth(), style.outlineOffset(), style.visitedDependentColor(CSSPropertyOutlineColor));
#endif
}
void RenderElement::paintOutline(PaintInfo& paintInfo, const LayoutRect& paintRect)
{
GraphicsContext& graphicsContext = paintInfo.context();
if (graphicsContext.paintingDisabled())
return;
if (!hasOutline())
return;
auto& styleToUse = style();
float outlineWidth = floorToDevicePixel(styleToUse.outlineWidth(), document().deviceScaleFactor());
float outlineOffset = floorToDevicePixel(styleToUse.outlineOffset(), document().deviceScaleFactor());
// Only paint the focus ring by hand if the theme isn't able to draw it.
if (styleToUse.outlineStyleIsAuto() && !theme().supportsFocusRing(styleToUse)) {
Vector<LayoutRect> focusRingRects;
addFocusRingRects(focusRingRects, paintRect.location(), paintInfo.paintContainer);
paintFocusRing(paintInfo, styleToUse, focusRingRects);
}
if (hasOutlineAnnotation() && !styleToUse.outlineStyleIsAuto() && !theme().supportsFocusRing(styleToUse))
addPDFURLRect(paintInfo, paintRect.location());
if (styleToUse.outlineStyleIsAuto() || styleToUse.outlineStyle() == BNONE)
return;
FloatRect outer = paintRect;
outer.inflate(outlineOffset + outlineWidth);
FloatRect inner = outer;
inner.inflate(-outlineWidth);
// FIXME: This prevents outlines from painting inside the object. See bug 12042
if (outer.isEmpty())
return;
EBorderStyle outlineStyle = styleToUse.outlineStyle();
Color outlineColor = styleToUse.visitedDependentColor(CSSPropertyOutlineColor);
bool useTransparencyLayer = !outlineColor.isOpaque();
if (useTransparencyLayer) {
if (outlineStyle == SOLID) {
Path path;
path.addRect(outer);
path.addRect(inner);
graphicsContext.setFillRule(RULE_EVENODD);
graphicsContext.setFillColor(outlineColor);
graphicsContext.fillPath(path);
return;
}
graphicsContext.beginTransparencyLayer(outlineColor.alphaAsFloat());
outlineColor = outlineColor.opaqueColor();
}
float leftOuter = outer.x();
float leftInner = inner.x();
float rightOuter = outer.maxX();
float rightInner = std::min(inner.maxX(), rightOuter);
float topOuter = outer.y();
float topInner = inner.y();
float bottomOuter = outer.maxY();
float bottomInner = std::min(inner.maxY(), bottomOuter);
drawLineForBoxSide(graphicsContext, FloatRect(FloatPoint(leftOuter, topOuter), FloatPoint(leftInner, bottomOuter)), BSLeft, outlineColor, outlineStyle, outlineWidth, outlineWidth);
drawLineForBoxSide(graphicsContext, FloatRect(FloatPoint(leftOuter, topOuter), FloatPoint(rightOuter, topInner)), BSTop, outlineColor, outlineStyle, outlineWidth, outlineWidth);
drawLineForBoxSide(graphicsContext, FloatRect(FloatPoint(rightInner, topOuter), FloatPoint(rightOuter, bottomOuter)), BSRight, outlineColor, outlineStyle, outlineWidth, outlineWidth);
drawLineForBoxSide(graphicsContext, FloatRect(FloatPoint(leftOuter, bottomInner), FloatPoint(rightOuter, bottomOuter)), BSBottom, outlineColor, outlineStyle, outlineWidth, outlineWidth);
if (useTransparencyLayer)
graphicsContext.endTransparencyLayer();
}
void RenderElement::issueRepaintForOutlineAuto(float outlineSize)
{
LayoutRect repaintRect;
Vector<LayoutRect> focusRingRects;
addFocusRingRects(focusRingRects, LayoutPoint(), containerForRepaint());
for (auto rect : focusRingRects) {
rect.inflate(outlineSize);
repaintRect.unite(rect);
}
repaintRectangle(repaintRect);
}
void RenderElement::updateOutlineAutoAncestor(bool hasOutlineAuto)
{
for (auto& child : childrenOfType<RenderObject>(*this)) {
if (hasOutlineAuto == child.hasOutlineAutoAncestor())
continue;
child.setHasOutlineAutoAncestor(hasOutlineAuto);
bool childHasOutlineAuto = child.outlineStyleForRepaint().outlineStyleIsAuto();
if (childHasOutlineAuto)
continue;
if (!is<RenderElement>(child))
continue;
downcast<RenderElement>(child).updateOutlineAutoAncestor(hasOutlineAuto);
}
if (is<RenderBoxModelObject>(*this)) {
if (auto* continuation = downcast<RenderBoxModelObject>(*this).continuation())
continuation->updateOutlineAutoAncestor(hasOutlineAuto);
}
}
bool RenderElement::hasOutlineAnnotation() const
{
return element() && element()->isLink() && document().printing();
}
bool RenderElement::hasSelfPaintingLayer() const
{
if (!hasLayer())
return false;
auto& layerModelObject = downcast<RenderLayerModelObject>(*this);
return layerModelObject.hasSelfPaintingLayer();
}
bool RenderElement::checkForRepaintDuringLayout() const
{
if (document().view()->layoutContext().needsFullRepaint() || !everHadLayout() || hasSelfPaintingLayer())
return false;
return !settings().repaintOutsideLayoutEnabled();
}
RespectImageOrientationEnum RenderElement::shouldRespectImageOrientation() const
{
#if USE(CG) || USE(CAIRO)
// This can only be enabled for ports which honor the orientation flag in their drawing code.
if (document().isImageDocument())
return RespectImageOrientation;
#endif
// Respect the image's orientation if it's being used as a full-page image or it's
// an <img> and the setting to respect it everywhere is set.
return settings().shouldRespectImageOrientation() && is<HTMLImageElement>(element()) ? RespectImageOrientation : DoNotRespectImageOrientation;
}
void RenderElement::adjustFragmentedFlowStateOnContainingBlockChangeIfNeeded()
{
if (fragmentedFlowState() == NotInsideFragmentedFlow)
return;
// Invalidate the containing block caches.
if (is<RenderBlock>(*this))
downcast<RenderBlock>(*this).resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants();
// Adjust the flow tread state on the subtree.
setFragmentedFlowState(RenderObject::computedFragmentedFlowState(*this));
for (auto& descendant : descendantsOfType<RenderObject>(*this))
descendant.setFragmentedFlowState(RenderObject::computedFragmentedFlowState(descendant));
}
void RenderElement::removeFromRenderFragmentedFlow()
{
ASSERT(fragmentedFlowState() != NotInsideFragmentedFlow);
// Sometimes we remove the element from the flow, but it's not destroyed at that time.
// It's only until later when we actually destroy it and remove all the children from it.
// Currently, that happens for firstLetter elements and list markers.
// Pass in the flow thread so that we don't have to look it up for all the children.
removeFromRenderFragmentedFlowIncludingDescendants(true);
}
void RenderElement::removeFromRenderFragmentedFlowIncludingDescendants(bool shouldUpdateState)
{
// Once we reach another flow thread we don't need to update the flow thread state
// but we have to continue cleanup the flow thread info.
if (isRenderFragmentedFlow())
shouldUpdateState = false;
for (auto& child : childrenOfType<RenderObject>(*this)) {
if (is<RenderElement>(child)) {
downcast<RenderElement>(child).removeFromRenderFragmentedFlowIncludingDescendants(shouldUpdateState);
continue;
}
if (shouldUpdateState)
child.setFragmentedFlowState(NotInsideFragmentedFlow);
}
// We have to ask for our containing flow thread as it may be above the removed sub-tree.
RenderFragmentedFlow* enclosingFragmentedFlow = this->enclosingFragmentedFlow();
while (enclosingFragmentedFlow) {
enclosingFragmentedFlow->removeFlowChildInfo(*this);
if (enclosingFragmentedFlow->fragmentedFlowState() == NotInsideFragmentedFlow)
break;
auto* parent = enclosingFragmentedFlow->parent();
if (!parent)
break;
enclosingFragmentedFlow = parent->enclosingFragmentedFlow();
}
if (is<RenderBlock>(*this))
downcast<RenderBlock>(*this).setCachedEnclosingFragmentedFlowNeedsUpdate();
if (shouldUpdateState)
setFragmentedFlowState(NotInsideFragmentedFlow);
}
void RenderElement::resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants(RenderFragmentedFlow* fragmentedFlow)
{
if (fragmentedFlow)
fragmentedFlow->removeFlowChildInfo(*this);
for (auto& child : childrenOfType<RenderElement>(*this))
child.resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants(fragmentedFlow);
}
#if ENABLE(TEXT_AUTOSIZING)
static RenderObject::BlockContentHeightType includeNonFixedHeight(const RenderObject& renderer)
{
const RenderStyle& style = renderer.style();
if (style.height().type() == Fixed) {
if (is<RenderBlock>(renderer)) {
// For fixed height styles, if the overflow size of the element spills out of the specified
// height, assume we can apply text auto-sizing.
if (style.overflowY() == OVISIBLE
&& style.height().value() < downcast<RenderBlock>(renderer).layoutOverflowRect().maxY())
return RenderObject::OverflowHeight;
}
return RenderObject::FixedHeight;
}
return RenderObject::FlexibleHeight;
}
void RenderElement::adjustComputedFontSizesOnBlocks(float size, float visibleWidth)
{
Document* document = view().frameView().frame().document();
if (!document)
return;
Vector<int> depthStack;
int currentDepth = 0;
int newFixedDepth = 0;
// We don't apply autosizing to nodes with fixed height normally.
// But we apply it to nodes which are located deep enough
// (nesting depth is greater than some const) inside of a parent block
// which has fixed height but its content overflows intentionally.
for (RenderObject* descendent = traverseNext(this, includeNonFixedHeight, currentDepth, newFixedDepth); descendent; descendent = descendent->traverseNext(this, includeNonFixedHeight, currentDepth, newFixedDepth)) {
while (depthStack.size() > 0 && currentDepth <= depthStack[depthStack.size() - 1])
depthStack.remove(depthStack.size() - 1);
if (newFixedDepth)
depthStack.append(newFixedDepth);
int stackSize = depthStack.size();
if (is<RenderBlockFlow>(*descendent) && !descendent->isListItem() && (!stackSize || currentDepth - depthStack[stackSize - 1] > TextAutoSizingFixedHeightDepth))
downcast<RenderBlockFlow>(*descendent).adjustComputedFontSizes(size, visibleWidth);
newFixedDepth = 0;
}
// Remove style from auto-sizing table that are no longer valid.
document->textAutoSizing().updateRenderTree();
}
void RenderElement::resetTextAutosizing()
{
Document* document = view().frameView().frame().document();
if (!document)
return;
LOG(TextAutosizing, "RenderElement::resetTextAutosizing()");
document->textAutoSizing().reset();
Vector<int> depthStack;
int currentDepth = 0;
int newFixedDepth = 0;
for (RenderObject* descendent = traverseNext(this, includeNonFixedHeight, currentDepth, newFixedDepth); descendent; descendent = descendent->traverseNext(this, includeNonFixedHeight, currentDepth, newFixedDepth)) {
while (depthStack.size() > 0 && currentDepth <= depthStack[depthStack.size() - 1])
depthStack.remove(depthStack.size() - 1);
if (newFixedDepth)
depthStack.append(newFixedDepth);
int stackSize = depthStack.size();
if (is<RenderBlockFlow>(*descendent) && !descendent->isListItem() && (!stackSize || currentDepth - depthStack[stackSize - 1] > TextAutoSizingFixedHeightDepth))
downcast<RenderBlockFlow>(*descendent).resetComputedFontSize();
newFixedDepth = 0;
}
}
#endif // ENABLE(TEXT_AUTOSIZING)
}