/
RenderLayer.cpp
7277 lines (6072 loc) · 306 KB
/
RenderLayer.cpp
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/*
* Copyright (C) 2006-2017 Apple Inc. All rights reserved.
*
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
*
* Other contributors:
* Robert O'Callahan <roc+@cs.cmu.edu>
* David Baron <dbaron@fas.harvard.edu>
* Christian Biesinger <cbiesinger@web.de>
* Randall Jesup <rjesup@wgate.com>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Josh Soref <timeless@mac.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
*/
#include "config.h"
#include "RenderLayer.h"
#include "BoxShape.h"
#include "CSSAnimationController.h"
#include "CSSPropertyNames.h"
#include "Chrome.h"
#include "DebugPageOverlays.h"
#include "Document.h"
#include "DocumentEventQueue.h"
#include "DocumentMarkerController.h"
#include "Element.h"
#include "EventHandler.h"
#include "FEColorMatrix.h"
#include "FEMerge.h"
#include "FilterEffectRenderer.h"
#include "FloatConversion.h"
#include "FloatPoint3D.h"
#include "FloatRect.h"
#include "FloatRoundedRect.h"
#include "FlowThreadController.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameSelection.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "HTMLFormControlElement.h"
#include "HTMLFrameElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLNames.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "HitTestingTransformState.h"
#include "Logging.h"
#include "MainFrame.h"
#include "NoEventDispatchAssertion.h"
#include "OverflowEvent.h"
#include "OverlapTestRequestClient.h"
#include "Page.h"
#include "PlatformMouseEvent.h"
#include "RenderFlexibleBox.h"
#include "RenderFlowThread.h"
#include "RenderGeometryMap.h"
#include "RenderImage.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayerBacking.h"
#include "RenderLayerCompositor.h"
#include "RenderLayerFilterInfo.h"
#include "RenderMarquee.h"
#include "RenderMultiColumnFlowThread.h"
#include "RenderNamedFlowFragment.h"
#include "RenderNamedFlowThread.h"
#include "RenderRegion.h"
#include "RenderReplica.h"
#include "RenderSVGResourceClipper.h"
#include "RenderScrollbar.h"
#include "RenderScrollbarPart.h"
#include "RenderTableCell.h"
#include "RenderTableRow.h"
#include "RenderText.h"
#include "RenderTheme.h"
#include "RenderTreeAsText.h"
#include "RenderView.h"
#include "SVGNames.h"
#include "ScaleTransformOperation.h"
#include "ScrollAnimator.h"
#include "Scrollbar.h"
#include "ScrollbarTheme.h"
#include "ScrollingCoordinator.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "SourceGraphic.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "TransformationMatrix.h"
#include "TranslateTransformOperation.h"
#include "WheelEventTestTrigger.h"
#include <stdio.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/CString.h>
#include <wtf/text/TextStream.h>
#if ENABLE(CSS_SCROLL_SNAP)
#include "AxisScrollSnapOffsets.h"
#endif
#define MIN_INTERSECT_FOR_REVEAL 32
namespace WebCore {
using namespace HTMLNames;
class ClipRects : public RefCounted<ClipRects> {
WTF_MAKE_FAST_ALLOCATED;
public:
static Ref<ClipRects> create()
{
return adoptRef(*new ClipRects);
}
static Ref<ClipRects> create(const ClipRects& other)
{
return adoptRef(*new ClipRects(other));
}
void reset()
{
m_overflowClipRect.reset();
m_fixedClipRect.reset();
m_posClipRect.reset();
m_fixed = false;
}
const ClipRect& overflowClipRect() const { return m_overflowClipRect; }
void setOverflowClipRect(const ClipRect& clipRect) { m_overflowClipRect = clipRect; }
const ClipRect& fixedClipRect() const { return m_fixedClipRect; }
void setFixedClipRect(const ClipRect& clipRect) { m_fixedClipRect = clipRect; }
const ClipRect& posClipRect() const { return m_posClipRect; }
void setPosClipRect(const ClipRect& clipRect) { m_posClipRect = clipRect; }
bool fixed() const { return m_fixed; }
void setFixed(bool fixed) { m_fixed = fixed; }
bool operator==(const ClipRects& other) const
{
return m_overflowClipRect == other.overflowClipRect()
&& m_fixedClipRect == other.fixedClipRect()
&& m_posClipRect == other.posClipRect()
&& m_fixed == other.fixed();
}
ClipRects& operator=(const ClipRects& other)
{
m_overflowClipRect = other.overflowClipRect();
m_fixedClipRect = other.fixedClipRect();
m_posClipRect = other.posClipRect();
m_fixed = other.fixed();
return *this;
}
private:
ClipRects() = default;
ClipRects(const LayoutRect& clipRect)
: m_overflowClipRect(clipRect)
, m_fixedClipRect(clipRect)
, m_posClipRect(clipRect)
{
}
ClipRects(const ClipRects& other)
: RefCounted()
, m_fixed(other.fixed())
, m_overflowClipRect(other.overflowClipRect())
, m_fixedClipRect(other.fixedClipRect())
, m_posClipRect(other.posClipRect())
{
}
bool m_fixed { false };
ClipRect m_overflowClipRect;
ClipRect m_fixedClipRect;
ClipRect m_posClipRect;
};
class ClipRectsCache {
WTF_MAKE_FAST_ALLOCATED;
public:
ClipRectsCache()
{
#ifndef NDEBUG
for (int i = 0; i < NumCachedClipRectsTypes; ++i) {
m_clipRectsRoot[i] = 0;
m_scrollbarRelevancy[i] = IgnoreOverlayScrollbarSize;
}
#endif
}
ClipRects* getClipRects(ClipRectsType clipRectsType, ShouldRespectOverflowClip respectOverflow) const
{
return m_clipRects[getIndex(clipRectsType, respectOverflow)].get();
}
void setClipRects(ClipRectsType clipRectsType, ShouldRespectOverflowClip respectOverflow, RefPtr<ClipRects>&& clipRects)
{
m_clipRects[getIndex(clipRectsType, respectOverflow)] = WTFMove(clipRects);
}
#ifndef NDEBUG
const RenderLayer* m_clipRectsRoot[NumCachedClipRectsTypes];
OverlayScrollbarSizeRelevancy m_scrollbarRelevancy[NumCachedClipRectsTypes];
#endif
private:
unsigned getIndex(ClipRectsType clipRectsType, ShouldRespectOverflowClip respectOverflow) const
{
unsigned index = static_cast<unsigned>(clipRectsType);
if (respectOverflow == RespectOverflowClip)
index += static_cast<unsigned>(NumCachedClipRectsTypes);
ASSERT_WITH_SECURITY_IMPLICATION(index < NumCachedClipRectsTypes * 2);
return index;
}
RefPtr<ClipRects> m_clipRects[NumCachedClipRectsTypes * 2];
};
void makeMatrixRenderable(TransformationMatrix& matrix, bool has3DRendering)
{
#if !ENABLE(3D_TRANSFORMS)
UNUSED_PARAM(has3DRendering);
matrix.makeAffine();
#else
if (!has3DRendering)
matrix.makeAffine();
#endif
}
RenderLayer::RenderLayer(RenderLayerModelObject& rendererLayerModelObject)
: m_isRootLayer(rendererLayerModelObject.isRenderView())
, m_forcedStackingContext(rendererLayerModelObject.isMedia())
, m_inResizeMode(false)
, m_scrollDimensionsDirty(true)
, m_normalFlowListDirty(true)
, m_hasSelfPaintingLayerDescendant(false)
, m_hasSelfPaintingLayerDescendantDirty(false)
, m_hasOutOfFlowPositionedDescendant(false)
, m_hasOutOfFlowPositionedDescendantDirty(true)
, m_needsCompositedScrolling(false)
, m_descendantsAreContiguousInStackingOrder(false)
, m_usedTransparency(false)
, m_paintingInsideReflection(false)
, m_inOverflowRelayout(false)
, m_repaintStatus(NeedsNormalRepaint)
, m_visibleContentStatusDirty(true)
, m_hasVisibleContent(false)
, m_visibleDescendantStatusDirty(false)
, m_hasVisibleDescendant(false)
, m_registeredScrollableArea(false)
, m_3DTransformedDescendantStatusDirty(true)
, m_has3DTransformedDescendant(false)
, m_hasCompositingDescendant(false)
, m_hasTransformedAncestor(false)
, m_has3DTransformedAncestor(false)
, m_indirectCompositingReason(static_cast<unsigned>(IndirectCompositingReason::None))
, m_viewportConstrainedNotCompositedReason(NoNotCompositedReason)
#if PLATFORM(IOS)
, m_adjustForIOSCaretWhenScrolling(false)
#endif
#if PLATFORM(IOS)
#if ENABLE(IOS_TOUCH_EVENTS)
, m_registeredAsTouchEventListenerForScrolling(false)
#endif
, m_inUserScroll(false)
, m_requiresScrollBoundsOriginUpdate(false)
#endif
, m_containsDirtyOverlayScrollbars(false)
, m_updatingMarqueePosition(false)
#if !ASSERT_DISABLED
, m_layerListMutationAllowed(true)
#endif
, m_hasFilterInfo(false)
#if ENABLE(CSS_COMPOSITING)
, m_blendMode(BlendModeNormal)
, m_hasNotIsolatedCompositedBlendingDescendants(false)
, m_hasNotIsolatedBlendingDescendants(false)
, m_hasNotIsolatedBlendingDescendantsStatusDirty(false)
#endif
, m_renderer(rendererLayerModelObject)
, m_parent(nullptr)
, m_previous(nullptr)
, m_next(nullptr)
, m_first(nullptr)
, m_last(nullptr)
, m_staticInlinePosition(0)
, m_staticBlockPosition(0)
, m_enclosingPaginationLayer(nullptr)
{
m_isNormalFlowOnly = shouldBeNormalFlowOnly();
m_isSelfPaintingLayer = shouldBeSelfPaintingLayer();
// Non-stacking containers should have empty z-order lists. As this is already the case,
// there is no need to dirty / recompute these lists.
m_zOrderListsDirty = isStackingContainer();
if (!renderer().firstChild()) {
m_visibleContentStatusDirty = false;
m_hasVisibleContent = renderer().style().visibility() == VISIBLE;
}
if (Element* element = renderer().element()) {
// We save and restore only the scrollOffset as the other scroll values are recalculated.
m_scrollPosition = element->savedLayerScrollPosition();
if (!m_scrollPosition.isZero())
scrollAnimator().setCurrentPosition(m_scrollPosition);
element->setSavedLayerScrollPosition(IntPoint());
}
}
RenderLayer::~RenderLayer()
{
if (inResizeMode())
renderer().frame().eventHandler().resizeLayerDestroyed();
ASSERT(m_registeredScrollableArea == renderer().view().frameView().containsScrollableArea(this));
if (m_registeredScrollableArea)
renderer().view().frameView().removeScrollableArea(this);
#if ENABLE(IOS_TOUCH_EVENTS)
unregisterAsTouchEventListenerForScrolling();
#endif
if (Element* element = renderer().element())
element->setSavedLayerScrollPosition(m_scrollPosition);
destroyScrollbar(HorizontalScrollbar);
destroyScrollbar(VerticalScrollbar);
if (auto* scrollingCoordinator = renderer().page().scrollingCoordinator())
scrollingCoordinator->willDestroyScrollableArea(*this);
if (m_reflection)
removeReflection();
FilterInfo::remove(*this);
// Child layers will be deleted by their corresponding render objects, so
// we don't need to delete them ourselves.
clearBacking(true);
}
String RenderLayer::name() const
{
StringBuilder name;
if (Element* element = renderer().element()) {
name.append(" <");
name.append(element->tagName().convertToLowercaseWithoutLocale());
name.append('>');
if (element->hasID()) {
name.appendLiteral(" id=\'");
name.append(element->getIdAttribute());
name.append('\'');
}
if (element->hasClass()) {
name.appendLiteral(" class=\'");
size_t classNamesToDump = element->classNames().size();
const size_t maxNumClassNames = 7;
bool addEllipsis = false;
if (classNamesToDump > maxNumClassNames) {
classNamesToDump = maxNumClassNames;
addEllipsis = true;
}
for (size_t i = 0; i < classNamesToDump; ++i) {
if (i > 0)
name.append(' ');
name.append(element->classNames()[i]);
}
if (addEllipsis)
name.append("...");
name.append('\'');
}
} else
name.append(renderer().renderName());
if (isReflection())
name.appendLiteral(" (reflection)");
return name.toString();
}
RenderLayerCompositor& RenderLayer::compositor() const
{
return renderer().view().compositor();
}
void RenderLayer::contentChanged(ContentChangeType changeType)
{
if ((changeType == CanvasChanged || changeType == VideoChanged || changeType == FullScreenChanged || changeType == ImageChanged) && compositor().updateLayerCompositingState(*this))
compositor().setCompositingLayersNeedRebuild();
if (m_backing)
m_backing->contentChanged(changeType);
}
bool RenderLayer::canRender3DTransforms() const
{
return compositor().canRender3DTransforms();
}
bool RenderLayer::paintsWithFilters() const
{
if (!renderer().hasFilter())
return false;
if (!isComposited())
return true;
if (!m_backing || !m_backing->canCompositeFilters())
return true;
return false;
}
bool RenderLayer::requiresFullLayerImageForFilters() const
{
if (!paintsWithFilters())
return false;
auto* renderer = filterRenderer();
return renderer && renderer->hasFilterThatMovesPixels();
}
FilterEffectRenderer* RenderLayer::filterRenderer() const
{
auto* filterInfo = FilterInfo::getIfExists(*this);
return filterInfo ? filterInfo->renderer() : nullptr;
}
void RenderLayer::updateLayerPositionsAfterLayout(const RenderLayer* rootLayer, UpdateLayerPositionsFlags flags)
{
LOG(Compositing, "RenderLayer %p updateLayerPositionsAfterLayout", this);
RenderGeometryMap geometryMap(UseTransforms);
if (this != rootLayer)
geometryMap.pushMappingsToAncestor(parent(), nullptr);
updateLayerPositions(&geometryMap, flags);
}
void RenderLayer::updateLayerPositions(RenderGeometryMap* geometryMap, UpdateLayerPositionsFlags flags)
{
updateLayerPosition(); // For relpositioned layers or non-positioned layers,
// we need to keep in sync, since we may have shifted relative
// to our parent layer.
if (geometryMap)
geometryMap->pushMappingsToAncestor(this, parent());
// Clear our cached clip rect information.
clearClipRects();
if (hasOverflowControls()) {
LayoutSize offsetFromRoot;
if (geometryMap)
offsetFromRoot = LayoutSize(toFloatSize(geometryMap->absolutePoint(FloatPoint())));
else {
// FIXME: It looks suspicious to call convertToLayerCoords here
// as canUseConvertToLayerCoords may be true for an ancestor layer.
offsetFromRoot = offsetFromAncestor(root());
}
positionOverflowControls(roundedIntSize(offsetFromRoot));
}
updateDescendantDependentFlags();
if (flags & UpdatePagination)
updatePagination();
else
m_enclosingPaginationLayer = nullptr;
if (m_hasVisibleContent) {
// FIXME: LayoutState does not work with RenderLayers as there is not a 1-to-1
// mapping between them and the RenderObjects. It would be neat to enable
// LayoutState outside the layout() phase and use it here.
ASSERT(!renderer().view().layoutStateEnabled());
RenderLayerModelObject* repaintContainer = renderer().containerForRepaint();
auto hadRepaintLayoutRects = renderer().hasRepaintLayoutRects();
RepaintLayoutRects oldRects = hadRepaintLayoutRects ? renderer().repaintLayoutRects() : RepaintLayoutRects();
computeRepaintRects(repaintContainer, geometryMap);
auto hasRepaintLayoutRects = renderer().hasRepaintLayoutRects();
RepaintLayoutRects newRects = hasRepaintLayoutRects ? renderer().repaintLayoutRects() : RepaintLayoutRects();
// FIXME: Should ASSERT that value calculated for m_outlineBox using the cached offset is the same
// as the value not using the cached offset, but we can't due to https://bugs.webkit.org/show_bug.cgi?id=37048
if ((flags & CheckForRepaint) && hasRepaintLayoutRects) {
if (!renderer().view().printing()) {
bool didRepaint = false;
if (m_repaintStatus & NeedsFullRepaint) {
if (hadRepaintLayoutRects)
renderer().repaintUsingContainer(repaintContainer, oldRects.m_repaintRect);
if (!hadRepaintLayoutRects || newRects.m_repaintRect != oldRects.m_repaintRect) {
renderer().repaintUsingContainer(repaintContainer, newRects.m_repaintRect);
didRepaint = true;
}
} else if (shouldRepaintAfterLayout()) {
// FIXME: We will convert this to just take the old and new RepaintLayoutRects once
// we change other callers to use RepaintLayoutRects.
renderer().repaintAfterLayoutIfNeeded(repaintContainer, oldRects.m_repaintRect, oldRects.m_outlineBox, &newRects.m_repaintRect, &newRects.m_outlineBox);
didRepaint = true;
}
if (didRepaint && renderer().isRenderNamedFlowFragmentContainer()) {
// If we just repainted a region, we must also repaint the flow thread since it is the one
// doing the actual painting of the flowed content.
RenderNamedFlowFragment& region = *downcast<RenderBlockFlow>(renderer()).renderNamedFlowFragment();
if (region.isValid())
region.flowThread()->layer()->repaintIncludingDescendants();
}
}
}
} else
clearRepaintRects();
m_repaintStatus = NeedsNormalRepaint;
m_hasTransformedAncestor = flags & SeenTransformedLayer;
m_has3DTransformedAncestor = flags & Seen3DTransformedLayer;
// Update the reflection's position and size.
if (m_reflection)
m_reflection->layout();
// Clear the IsCompositingUpdateRoot flag once we've found the first compositing layer in this update.
bool isUpdateRoot = (flags & IsCompositingUpdateRoot);
if (isComposited())
flags &= ~IsCompositingUpdateRoot;
if (renderer().isInFlowRenderFlowThread()) {
updatePagination();
flags |= UpdatePagination;
}
if (transform()) {
flags |= SeenTransformedLayer;
if (!transform()->isAffine())
flags |= Seen3DTransformedLayer;
}
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->updateLayerPositions(geometryMap, flags);
if ((flags & UpdateCompositingLayers) && isComposited()) {
RenderLayerBacking::UpdateAfterLayoutFlags updateFlags = RenderLayerBacking::CompositingChildrenOnly;
if (flags & NeedsFullRepaintInBacking)
updateFlags |= RenderLayerBacking::NeedsFullRepaint;
if (isUpdateRoot)
updateFlags |= RenderLayerBacking::IsUpdateRoot;
backing()->updateAfterLayout(updateFlags);
}
// With all our children positioned, now update our marquee if we need to.
if (m_marquee) {
// FIXME: would like to use SetForScope<> but it doesn't work with bitfields.
bool oldUpdatingMarqueePosition = m_updatingMarqueePosition;
m_updatingMarqueePosition = true;
m_marquee->updateMarqueePosition();
m_updatingMarqueePosition = oldUpdatingMarqueePosition;
}
if (geometryMap)
geometryMap->popMappingsToAncestor(parent());
renderer().document().markers().invalidateRectsForAllMarkers();
}
LayoutRect RenderLayer::repaintRectIncludingNonCompositingDescendants() const
{
LayoutRect repaintRect = renderer().repaintLayoutRects().m_repaintRect;
for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
// Don't include repaint rects for composited child layers; they will paint themselves and have a different origin.
if (child->isComposited())
continue;
repaintRect.uniteIfNonZero(child->repaintRectIncludingNonCompositingDescendants());
}
return repaintRect;
}
void RenderLayer::setAncestorChainHasSelfPaintingLayerDescendant()
{
for (RenderLayer* layer = this; layer; layer = layer->parent()) {
if (!layer->m_hasSelfPaintingLayerDescendantDirty && layer->hasSelfPaintingLayerDescendant())
break;
layer->m_hasSelfPaintingLayerDescendantDirty = false;
layer->m_hasSelfPaintingLayerDescendant = true;
}
}
void RenderLayer::dirtyAncestorChainHasSelfPaintingLayerDescendantStatus()
{
for (RenderLayer* layer = this; layer; layer = layer->parent()) {
layer->m_hasSelfPaintingLayerDescendantDirty = true;
// If we have reached a self-painting layer, we know our parent should have a self-painting descendant
// in this case, there is no need to dirty our ancestors further.
if (layer->isSelfPaintingLayer()) {
ASSERT(!parent() || parent()->m_hasSelfPaintingLayerDescendantDirty || parent()->hasSelfPaintingLayerDescendant());
break;
}
}
}
bool RenderLayer::acceleratedCompositingForOverflowScrollEnabled() const
{
return renderer().settings().acceleratedCompositingForOverflowScrollEnabled();
}
// If we are a stacking container, then this function will determine if our
// descendants for a contiguous block in stacking order. This is required in
// order for an element to be safely promoted to a stacking container. It is safe
// to become a stacking container if this change would not alter the stacking
// order of layers on the page. That can only happen if a non-descendant appear
// between us and our descendants in stacking order. Here's an example:
//
// this
// / | \.
// A B C
// /\ | /\.
// 0 -8 D 2 7
// |
// 5
//
// I've labeled our normal flow descendants A, B, C, and D, our stacking
// container descendants with their z indices, and us with 'this' (we're a
// stacking container and our zIndex doesn't matter here). These nodes appear in
// three lists: posZOrder, negZOrder, and normal flow (keep in mind that normal
// flow layers don't overlap). So if we arrange these lists in order we get our
// stacking order:
//
// [-8], [A-D], [0, 2, 5, 7]--> pos z-order.
// | |
// Neg z-order. <-+ +--> Normal flow descendants.
//
// We can then assign new, 'stacking' order indices to these elements as follows:
//
// [-8], [A-D], [0, 2, 5, 7]
// 'Stacking' indices: -1 0 1 2 3 4
//
// Note that the normal flow descendants can share an index because they don't
// stack/overlap. Now our problem becomes very simple: a layer can safely become
// a stacking container if the stacking-order indices of it and its descendants
// appear in a contiguous block in the list of stacking indices. This problem
// can be solved very efficiently by calculating the min/max stacking indices in
// the subtree, and the number stacking container descendants. Once we have this
// information, we know that the subtree's indices form a contiguous block if:
//
// maxStackIndex - minStackIndex == numSCDescendants
//
// So for node A in the example above we would have:
// maxStackIndex = 1
// minStackIndex = -1
// numSCDecendants = 2
//
// and so,
// maxStackIndex - minStackIndex == numSCDescendants
// ===> 1 - (-1) == 2
// ===> 2 == 2
//
// Since this is true, A can safely become a stacking container.
// Now, for node C we have:
//
// maxStackIndex = 4
// minStackIndex = 0 <-- because C has stacking index 0.
// numSCDecendants = 2
//
// and so,
// maxStackIndex - minStackIndex == numSCDescendants
// ===> 4 - 0 == 2
// ===> 4 == 2
//
// Since this is false, C cannot be safely promoted to a stacking container. This
// happened because of the elements with z-index 5 and 0. Now if 5 had been a
// child of C rather than D, and A had no child with Z index 0, we would have had:
//
// maxStackIndex = 3
// minStackIndex = 0 <-- because C has stacking index 0.
// numSCDecendants = 3
//
// and so,
// maxStackIndex - minStackIndex == numSCDescendants
// ===> 3 - 0 == 3
// ===> 3 == 3
//
// And we would conclude that C could be promoted.
void RenderLayer::updateDescendantsAreContiguousInStackingOrder()
{
if (!isStackingContext() || !acceleratedCompositingForOverflowScrollEnabled())
return;
ASSERT(!m_normalFlowListDirty);
ASSERT(!m_zOrderListsDirty);
std::unique_ptr<Vector<RenderLayer*>> posZOrderList;
std::unique_ptr<Vector<RenderLayer*>> negZOrderList;
rebuildZOrderLists(StopAtStackingContexts, posZOrderList, negZOrderList);
// Create a reverse lookup.
HashMap<const RenderLayer*, int> lookup;
if (negZOrderList) {
int stackingOrderIndex = -1;
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* currentLayer = negZOrderList->at(listSize - i - 1);
if (!currentLayer->isStackingContext())
continue;
lookup.set(currentLayer, stackingOrderIndex--);
}
}
if (posZOrderList) {
size_t listSize = posZOrderList->size();
int stackingOrderIndex = 1;
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* currentLayer = posZOrderList->at(i);
if (!currentLayer->isStackingContext())
continue;
lookup.set(currentLayer, stackingOrderIndex++);
}
}
int minIndex = 0;
int maxIndex = 0;
int count = 0;
bool firstIteration = true;
updateDescendantsAreContiguousInStackingOrderRecursive(lookup, minIndex, maxIndex, count, firstIteration);
}
void RenderLayer::updateDescendantsAreContiguousInStackingOrderRecursive(const HashMap<const RenderLayer*, int>& lookup, int& minIndex, int& maxIndex, int& count, bool firstIteration)
{
if (isStackingContext() && !firstIteration) {
if (lookup.contains(this)) {
minIndex = std::min(minIndex, lookup.get(this));
maxIndex = std::max(maxIndex, lookup.get(this));
count++;
}
return;
}
for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
int childMinIndex = 0;
int childMaxIndex = 0;
int childCount = 0;
child->updateDescendantsAreContiguousInStackingOrderRecursive(lookup, childMinIndex, childMaxIndex, childCount, false);
if (childCount) {
count += childCount;
minIndex = std::min(minIndex, childMinIndex);
maxIndex = std::max(maxIndex, childMaxIndex);
}
}
if (!isStackingContext()) {
bool newValue = maxIndex - minIndex == count;
bool didUpdate = newValue != m_descendantsAreContiguousInStackingOrder;
m_descendantsAreContiguousInStackingOrder = newValue;
if (didUpdate)
updateNeedsCompositedScrolling();
}
}
void RenderLayer::computeRepaintRects(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap)
{
ASSERT(!m_visibleContentStatusDirty);
renderer().computeRepaintLayoutRects(repaintContainer, geometryMap);
}
void RenderLayer::computeRepaintRectsIncludingDescendants()
{
// FIXME: computeRepaintRects() has to walk up the parent chain for every layer to compute the rects.
// We should make this more efficient.
// FIXME: it's wrong to call this when layout is not up-to-date, which we do.
computeRepaintRects(renderer().containerForRepaint());
for (RenderLayer* layer = firstChild(); layer; layer = layer->nextSibling())
layer->computeRepaintRectsIncludingDescendants();
}
void RenderLayer::clearRepaintRects()
{
ASSERT(!m_visibleContentStatusDirty);
renderer().clearRepaintLayoutRects();
}
void RenderLayer::updateLayerPositionsAfterDocumentScroll()
{
ASSERT(this == renderer().view().layer());
LOG(Scrolling, "RenderLayer::updateLayerPositionsAfterDocumentScroll");
RenderGeometryMap geometryMap(UseTransforms);
updateLayerPositionsAfterScroll(&geometryMap);
}
void RenderLayer::updateLayerPositionsAfterOverflowScroll()
{
RenderGeometryMap geometryMap(UseTransforms);
if (this != renderer().view().layer())
geometryMap.pushMappingsToAncestor(parent(), nullptr);
// FIXME: why is it OK to not check the ancestors of this layer in order to
// initialize the HasSeenViewportConstrainedAncestor and HasSeenAncestorWithOverflowClip flags?
updateLayerPositionsAfterScroll(&geometryMap, IsOverflowScroll);
}
void RenderLayer::updateLayerPositionsAfterScroll(RenderGeometryMap* geometryMap, UpdateLayerPositionsAfterScrollFlags flags)
{
// FIXME: This shouldn't be needed, but there are some corner cases where
// these flags are still dirty. Update so that the check below is valid.
updateDescendantDependentFlags();
// If we have no visible content and no visible descendants, there is no point recomputing
// our rectangles as they will be empty. If our visibility changes, we are expected to
// recompute all our positions anyway.
if (!m_hasVisibleDescendant && !m_hasVisibleContent)
return;
bool positionChanged = updateLayerPosition();
if (positionChanged)
flags |= HasChangedAncestor;
if (flags & HasChangedAncestor || flags & HasSeenViewportConstrainedAncestor || flags & IsOverflowScroll)
clearClipRects();
if (renderer().style().hasViewportConstrainedPosition())
flags |= HasSeenViewportConstrainedAncestor;
if (renderer().hasOverflowClip())
flags |= HasSeenAncestorWithOverflowClip;
bool shouldComputeRepaintRects = (flags & HasSeenViewportConstrainedAncestor || (flags & IsOverflowScroll && flags & HasSeenAncestorWithOverflowClip)) && isSelfPaintingLayer();
bool isVisuallyEmpty = !isVisuallyNonEmpty();
bool shouldPushAndPopMappings = geometryMap && ((shouldComputeRepaintRects && !isVisuallyEmpty) || firstChild());
if (shouldPushAndPopMappings)
geometryMap->pushMappingsToAncestor(this, parent());
if (shouldComputeRepaintRects) {
// When scrolling, we don't compute repaint rects for visually non-empty layers.
if (isVisuallyEmpty)
clearRepaintRects();
else // FIXME: We could track the repaint container as we walk down the tree.
computeRepaintRects(renderer().containerForRepaint(), geometryMap);
} else {
// Check that our cached rects are correct.
ASSERT(!renderer().hasRepaintLayoutRects() || renderer().repaintLayoutRects().m_repaintRect == renderer().clippedOverflowRectForRepaint(renderer().containerForRepaint()));
ASSERT(!renderer().hasRepaintLayoutRects() || renderer().repaintLayoutRects().m_outlineBox == renderer().outlineBoundsForRepaint(renderer().containerForRepaint()));
}
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->updateLayerPositionsAfterScroll(geometryMap, flags);
// We don't update our reflection as scrolling is a translation which does not change the size()
// of an object, thus RenderReplica will still repaint itself properly as the layer position was
// updated above.
if (m_marquee) {
bool oldUpdatingMarqueePosition = m_updatingMarqueePosition;
m_updatingMarqueePosition = true;
m_marquee->updateMarqueePosition();
m_updatingMarqueePosition = oldUpdatingMarqueePosition;
}
if (shouldPushAndPopMappings)
geometryMap->popMappingsToAncestor(parent());
renderer().document().markers().invalidateRectsForAllMarkers();
}
void RenderLayer::positionNewlyCreatedOverflowControls()
{
if (!backing()->hasUnpositionedOverflowControlsLayers())
return;
RenderGeometryMap geometryMap(UseTransforms);
if (this != renderer().view().layer() && parent())
geometryMap.pushMappingsToAncestor(parent(), nullptr);
LayoutPoint offsetFromRoot = LayoutPoint(geometryMap.absolutePoint(FloatPoint()));
positionOverflowControls(toIntSize(roundedIntPoint(offsetFromRoot)));
}
#if ENABLE(CSS_COMPOSITING)
void RenderLayer::updateBlendMode()
{
bool hadBlendMode = m_blendMode != BlendModeNormal;
if (parent() && hadBlendMode != hasBlendMode()) {
if (hasBlendMode())
parent()->updateAncestorChainHasBlendingDescendants();
else
parent()->dirtyAncestorChainHasBlendingDescendants();
}
BlendMode newBlendMode = renderer().style().blendMode();
if (newBlendMode != m_blendMode)
m_blendMode = newBlendMode;
}
void RenderLayer::updateAncestorChainHasBlendingDescendants()
{
for (auto* layer = this; layer; layer = layer->parent()) {
if (!layer->hasNotIsolatedBlendingDescendantsStatusDirty() && layer->hasNotIsolatedBlendingDescendants())
break;
layer->m_hasNotIsolatedBlendingDescendants = true;
layer->m_hasNotIsolatedBlendingDescendantsStatusDirty = false;
layer->updateSelfPaintingLayer();
if (layer->isStackingContext())
break;
}
}
void RenderLayer::dirtyAncestorChainHasBlendingDescendants()
{
for (auto* layer = this; layer; layer = layer->parent()) {
if (layer->hasNotIsolatedBlendingDescendantsStatusDirty())
break;
layer->m_hasNotIsolatedBlendingDescendantsStatusDirty = true;
if (layer->isStackingContext())
break;
}
}
#endif
void RenderLayer::updateTransform()
{
bool hasTransform = renderer().hasTransform();
bool had3DTransform = has3DTransform();
bool hadTransform = !!m_transform;
if (hasTransform != hadTransform) {
if (hasTransform)
m_transform = std::make_unique<TransformationMatrix>();
else
m_transform = nullptr;
// Layers with transforms act as clip rects roots, so clear the cached clip rects here.
clearClipRectsIncludingDescendants();
}
if (hasTransform) {
RenderBox* box = renderBox();
ASSERT(box);
m_transform->makeIdentity();
box->style().applyTransform(*m_transform, snapRectToDevicePixels(box->borderBoxRect(), box->document().deviceScaleFactor()), RenderStyle::IncludeTransformOrigin);
makeMatrixRenderable(*m_transform, canRender3DTransforms());
}
if (had3DTransform != has3DTransform())
dirty3DTransformedDescendantStatus();
}
TransformationMatrix RenderLayer::currentTransform(RenderStyle::ApplyTransformOrigin applyOrigin) const
{
if (!m_transform)