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<
/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 "core/rendering/RenderLayer.h"
#include "core/CSSPropertyNames.h"
#include "core/HTMLNames.h"
#include "core/css/PseudoStyleRequest.h"
#include "core/dom/Document.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/frame/DeprecatedScheduleStyleRecalcDuringLayout.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLFrameElement.h"
#include "core/page/Page.h"
#include "core/page/scrolling/ScrollingCoordinator.h"
#include "core/rendering/ColumnInfo.h"
#include "core/rendering/FilterEffectRenderer.h"
#include "core/rendering/HitTestRequest.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/HitTestingTransformState.h"
#include "core/rendering/RenderFlowThread.h"
#include "core/rendering/RenderGeometryMap.h"
#include "core/rendering/RenderInline.h"
#include "core/rendering/RenderPart.h"
#include "core/rendering/RenderReplica.h"
#include "core/rendering/RenderScrollbar.h"
#include "core/rendering/RenderScrollbarPart.h"
#include "core/rendering/RenderTreeAsText.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/compositing/CompositedLayerMapping.h"
#include "core/rendering/compositing/RenderLayerCompositor.h"
#include "core/rendering/svg/ReferenceFilterBuilder.h"
#include "platform/LengthFunctions.h"
#include "platform/Partitions.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/TraceEvent.h"
#include "platform/geometry/FloatPoint3D.h"
#include "platform/geometry/FloatRect.h"
#include "platform/geometry/TransformState.h"
#include "platform/graphics/filters/ReferenceFilter.h"
#include "platform/graphics/filters/SourceGraphic.h"
#include "platform/transforms/ScaleTransformOperation.h"
#include "platform/transforms/TransformationMatrix.h"
#include "platform/transforms/TranslateTransformOperation.h"
#include "public/platform/Platform.h"
#include "wtf/StdLibExtras.h"
#include "wtf/text/CString.h"
namespace blink {
namespace {
static CompositingQueryMode gCompositingQueryMode =
CompositingQueriesAreOnlyAllowedInCertainDocumentLifecyclePhases;
} // namespace
using namespace HTMLNames;
RenderLayer::RenderLayer(RenderLayerModelObject* renderer, LayerType type)
: m_layerType(type)
, m_hasSelfPaintingLayerDescendant(false)
, m_hasSelfPaintingLayerDescendantDirty(false)
, m_isRootLayer(renderer->isRenderView())
, m_usedTransparency(false)
, m_visibleContentStatusDirty(true)
, m_hasVisibleContent(false)
, m_visibleDescendantStatusDirty(false)
, m_hasVisibleDescendant(false)
, m_hasVisibleNonLayerContent(false)
, m_isPaginated(false)
, m_3DTransformedDescendantStatusDirty(true)
, m_has3DTransformedDescendant(false)
, m_containsDirtyOverlayScrollbars(false)
, m_hasFilterInfo(false)
, m_needsAncestorDependentCompositingInputsUpdate(true)
, m_needsDescendantDependentCompositingInputsUpdate(true)
, m_childNeedsCompositingInputsUpdate(true)
, m_hasCompositingDescendant(false)
, m_hasNonCompositedChild(false)
, m_shouldIsolateCompositedDescendants(false)
, m_lostGroupedMapping(false)
, m_renderer(renderer)
, m_parent(0)
, m_previous(0)
, m_next(0)
, m_first(0)
, m_last(0)
, m_staticInlinePosition(0)
, m_staticBlockPosition(0)
, m_enclosingPaginationLayer(0)
, m_potentialCompositingReasonsFromStyle(CompositingReasonNone)
, m_compositingReasons(CompositingReasonNone)
, m_groupedMapping(0)
, m_clipper(*renderer)
{
updateStackingNode();
m_isSelfPaintingLayer = shouldBeSelfPaintingLayer();
if (!renderer->slowFirstChild() && renderer->style()) {
m_visibleContentStatusDirty = false;
m_hasVisibleContent = renderer->style()->visibility() == VISIBLE;
}
updateScrollableArea();
}
RenderLayer::~RenderLayer()
{
if (renderer()->frame() && renderer()->frame()->page()) {
if (ScrollingCoordinator* scrollingCoordinator = renderer()->frame()->page()->scrollingCoordinator())
scrollingCoordinator->willDestroyRenderLayer(this);
}
removeFilterInfoIfNeeded();
if (groupedMapping()) {
DisableCompositingQueryAsserts disabler;
groupedMapping()->removeRenderLayerFromSquashingGraphicsLayer(this);
setGroupedMapping(0);
}
// Child layers will be deleted by their corresponding render objects, so
// we don't need to delete them ourselves.
clearCompositedLayerMapping(true);
if (m_reflectionInfo)
m_reflectionInfo->destroy();
}
String RenderLayer::debugName() const
{
if (isReflection()) {
return renderer()->parent()->debugName() + " (reflection)";
}
return renderer()->debugName();
}
RenderLayerCompositor* RenderLayer::compositor() const
{
if (!renderer()->view())
return 0;
return renderer()->view()->compositor();
}
void RenderLayer::contentChanged(ContentChangeType changeType)
{
// updateLayerCompositingState will query compositingReasons for accelerated overflow scrolling.
// This is tripped by LayoutTests/compositing/content-changed-chicken-egg.html
DisableCompositingQueryAsserts disabler;
if (changeType == CanvasChanged)
compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
if (changeType == CanvasContextChanged) {
compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
// Although we're missing test coverage, we need to call
// GraphicsLayer::setContentsToPlatformLayer with the new platform
// layer for this canvas.
// See http://crbug.com/349195
if (hasCompositedLayerMapping())
compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
}
if (m_compositedLayerMapping)
m_compositedLayerMapping->contentChanged(changeType);
}
bool RenderLayer::paintsWithFilters() const
{
if (!renderer()->hasFilter())
return false;
// https://code.google.com/p/chromium/issues/detail?id=343759
DisableCompositingQueryAsserts disabler;
return !m_compositedLayerMapping || compositingState() != PaintsIntoOwnBacking;
}
LayoutSize RenderLayer::subpixelAccumulation() const
{
return m_subpixelAccumulation;
}
void RenderLayer::setSubpixelAccumulation(const LayoutSize& size)
{
m_subpixelAccumulation = size;
}
void RenderLayer::updateLayerPositionsAfterLayout()
{
TRACE_EVENT0("blink", "RenderLayer::updateLayerPositionsAfterLayout");
m_clipper.clearClipRectsIncludingDescendants();
updateLayerPositionRecursive();
{
// FIXME: Remove incremental compositing updates after fixing the chicken/egg issues
// https://code.google.com/p/chromium/issues/detail?id=343756
DisableCompositingQueryAsserts disabler;
bool needsPaginationUpdate = isPaginated() || enclosingPaginationLayer();
updatePaginationRecursive(needsPaginationUpdate);
}
}
void RenderLayer::updateLayerPositionRecursive()
{
if (m_reflectionInfo)
m_reflectionInfo->reflection()->layout();
// FIXME: We should be able to remove this call because we don't care about
// any descendant-dependent flags, but code somewhere else is reading these
// flags and depending on us to update them.
updateDescendantDependentFlags();
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->updateLayerPositionRecursive();
}
void RenderLayer::updateHasSelfPaintingLayerDescendant() const
{
ASSERT(m_hasSelfPaintingLayerDescendantDirty);
m_hasSelfPaintingLayerDescendant = false;
for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
if (child->isSelfPaintingLayer() || child->hasSelfPaintingLayerDescendant()) {
m_hasSelfPaintingLayerDescendant = true;
break;
}
}
m_hasSelfPaintingLayerDescendantDirty = false;
}
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()->m_hasSelfPaintingLayerDescendant);
break;
}
}
}
bool RenderLayer::scrollsWithViewport() const
{
return renderer()->style()->position() == FixedPosition && renderer()->containerForFixedPosition() == renderer()->view();
}
bool RenderLayer::scrollsWithRespectTo(const RenderLayer* other) const
{
if (scrollsWithViewport() != other->scrollsWithViewport())
return true;
return ancestorScrollingLayer() != other->ancestorScrollingLayer();
}
void RenderLayer::updateTransformationMatrix()
{
if (m_transform) {
RenderBox* box = renderBox();
ASSERT(box);
m_transform->makeIdentity();
box->style()->applyTransform(*m_transform, box->pixelSnappedBorderBoxRect().size(), RenderStyle::IncludeTransformOrigin);
makeMatrixRenderable(*m_transform, compositor()->hasAcceleratedCompositing());
}
}
void RenderLayer::updateTransform(const RenderStyle* oldStyle, RenderStyle* newStyle)
{
if (oldStyle && newStyle->transformDataEquivalent(*oldStyle))
return;
// hasTransform() on the renderer is also true when there is transform-style: preserve-3d or perspective set,
// so check style too.
bool hasTransform = renderer()->hasTransformRelatedProperty() && newStyle->hasTransform();
bool had3DTransform = has3DTransform();
bool hadTransform = m_transform;
if (hasTransform != hadTransform) {
if (hasTransform)
m_transform = adoptPtr(new TransformationMatrix);
else
m_transform.clear();
// Layers with transforms act as clip rects roots, so clear the cached clip rects here.
m_clipper.clearClipRectsIncludingDescendants();
} else if (hasTransform) {
m_clipper.clearClipRectsIncludingDescendants(AbsoluteClipRects);
}
updateTransformationMatrix();
if (had3DTransform != has3DTransform())
dirty3DTransformedDescendantStatus();
}
static RenderLayer* enclosingLayerForContainingBlock(RenderLayer* layer)
{
if (RenderObject* containingBlock = layer->renderer()->containingBlock())
return containingBlock->enclosingLayer();
return 0;
}
RenderLayer* RenderLayer::renderingContextRoot()
{
RenderLayer* renderingContext = 0;
if (shouldPreserve3D())
renderingContext = this;
for (RenderLayer* current = enclosingLayerForContainingBlock(this); current && current->shouldPreserve3D(); current = enclosingLayerForContainingBlock(current))
renderingContext = current;
return renderingContext;
}
TransformationMatrix RenderLayer::currentTransform(RenderStyle::ApplyTransformOrigin applyOrigin) const
{
if (!m_transform)
return TransformationMatrix();
// m_transform includes transform-origin, so we need to recompute the transform here.
if (applyOrigin == RenderStyle::ExcludeTransformOrigin) {
RenderBox* box = renderBox();
TransformationMatrix currTransform;
box->style()->applyTransform(currTransform, box->pixelSnappedBorderBoxRect().size(), RenderStyle::ExcludeTransformOrigin);
makeMatrixRenderable(currTransform, compositor()->hasAcceleratedCompositing());
return currTransform;
}
return *m_transform;
}
TransformationMatrix RenderLayer::renderableTransform(PaintBehavior paintBehavior) const
{
if (!m_transform)
return TransformationMatrix();
if (paintBehavior & PaintBehaviorFlattenCompositingLayers) {
TransformationMatrix matrix = *m_transform;
makeMatrixRenderable(matrix, false /* flatten 3d */);
return matrix;
}
return *m_transform;
}
static bool checkContainingBlockChainForPagination(RenderLayerModelObject* renderer, RenderBox* ancestorColumnsRenderer)
{
RenderView* view = renderer->view();
RenderLayerModelObject* prevBlock = renderer;
RenderBlock* containingBlock;
for (containingBlock = renderer->containingBlock();
containingBlock && containingBlock != view && containingBlock != ancestorColumnsRenderer;
containingBlock = containingBlock->containingBlock())
prevBlock = containingBlock;
// If the columns block wasn't in our containing block chain, then we aren't paginated by it.
if (containingBlock != ancestorColumnsRenderer)
return false;
// If the previous block is absolutely positioned, then we can't be paginated by the columns block.
if (prevBlock->isOutOfFlowPositioned())
return false;
// Otherwise we are paginated by the columns block.
return true;
}
// Convert a bounding box from flow thread coordinates, relative to |layer|, to visual coordinates, relative to |ancestorLayer|.
static void convertFromFlowThreadToVisualBoundingBoxInAncestor(const RenderLayer* layer, const RenderLayer* ancestorLayer, LayoutRect& rect)
{
RenderLayer* paginationLayer = layer->enclosingPaginationLayer();
ASSERT(paginationLayer);
RenderFlowThread* flowThread = toRenderFlowThread(paginationLayer->renderer());
// First make the flow thread rectangle relative to the flow thread, not to |layer|.
LayoutPoint offsetWithinPaginationLayer;
layer->convertToLayerCoords(paginationLayer, offsetWithinPaginationLayer);
rect.moveBy(offsetWithinPaginationLayer);
// Then make the rectangle visual, relative to the fragmentation context. Split our box up into
// the actual fragment boxes that render in the columns/pages and unite those together to get
// our true bounding box.
rect = flowThread->fragmentsBoundingBox(rect);
// Finally, make the visual rectangle relative to |ancestorLayer|.
// FIXME: Handle nested fragmentation contexts (crbug.com/423076). For now just give up if there
// are different pagination layers involved.
if (!ancestorLayer->enclosingPaginationLayer() || ancestorLayer->enclosingPaginationLayer() != paginationLayer) {
// The easy case. The ancestor layer is not within the pagination layer.
paginationLayer->convertToLayerCoords(ancestorLayer, rect);
return;
}
// The ancestor layer is also inside the pagination layer, so we need to subtract the visual
// distance from the ancestor layer to the pagination layer.
LayoutPoint offsetFromPaginationLayerToAncestor;
ancestorLayer->convertToLayerCoords(paginationLayer, offsetFromPaginationLayerToAncestor);
offsetFromPaginationLayerToAncestor = flowThread->flowThreadPointToVisualPoint(offsetFromPaginationLayerToAncestor);
rect.moveBy(-offsetFromPaginationLayerToAncestor);
}
bool RenderLayer::useRegionBasedColumns() const
{
return renderer()->document().regionBasedColumnsEnabled();
}
void RenderLayer::updatePaginationRecursive(bool needsPaginationUpdate)
{
m_isPaginated = false;
m_enclosingPaginationLayer = 0;
if (useRegionBasedColumns() && renderer()->isRenderFlowThread())
needsPaginationUpdate = true;
if (needsPaginationUpdate)
updatePagination();
if (renderer()->hasColumns())
needsPaginationUpdate = true;
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->updatePaginationRecursive(needsPaginationUpdate);
}
void RenderLayer::updatePagination()
{
bool usesRegionBasedColumns = useRegionBasedColumns();
if ((!usesRegionBasedColumns && compositingState() != NotComposited) || !parent())
return; // FIXME: For now the RenderView can't be paginated. Eventually printing will move to a model where it is though.
// The main difference between the paginated booleans for the old column code and the new column code
// is that each paginated layer has to paint on its own with the new code. There is no
// recurring into child layers. This means that the m_isPaginated bits for the new column code can't just be set on
// "roots" that get split and paint all their descendants. Instead each layer has to be checked individually and
// genuinely know if it is going to have to split itself up when painting only its contents (and not any other descendant
// layers). We track an enclosingPaginationLayer instead of using a simple bit, since we want to be able to get back
// to that layer easily.
if (usesRegionBasedColumns && renderer()->isRenderFlowThread()) {
m_enclosingPaginationLayer = this;
return;
}
if (m_stackingNode->isNormalFlowOnly()) {
if (usesRegionBasedColumns) {
// Content inside a transform is not considered to be paginated, since we simply
// paint the transform multiple times in each column, so we don't have to use
// fragments for the transformed content.
m_enclosingPaginationLayer = parent()->enclosingPaginationLayer();
if (m_enclosingPaginationLayer && m_enclosingPaginationLayer->hasTransformRelatedProperty())
m_enclosingPaginationLayer = 0;
} else {
m_isPaginated = parent()->renderer()->hasColumns();
}
return;
}
// For the new columns code, we want to walk up our containing block chain looking for an enclosing layer. Once
// we find one, then we just check its pagination status.
if (usesRegionBasedColumns) {
RenderView* view = renderer()->view();
RenderBlock* containingBlock;
for (containingBlock = renderer()->containingBlock();
containingBlock && containingBlock != view;
containingBlock = containingBlock->containingBlock()) {
if (containingBlock->hasLayer()) {
// Content inside a transform is not considered to be paginated, since we simply
// paint the transform multiple times in each column, so we don't have to use
// fragments for the transformed content.
m_enclosingPaginationLayer = containingBlock->layer()->enclosingPaginationLayer();
if (m_enclosingPaginationLayer && m_enclosingPaginationLayer->hasTransformRelatedProperty())
m_enclosingPaginationLayer = 0;
return;
}
}
return;
}
// If we're not normal flow, then we need to look for a multi-column object between us and our stacking container.
RenderLayerStackingNode* ancestorStackingContextNode = m_stackingNode->ancestorStackingContextNode();
for (RenderLayer* curr = parent(); curr; curr = curr->parent()) {
if (curr->renderer()->hasColumns()) {
m_isPaginated = checkContainingBlockChainForPagination(renderer(), curr->renderBox());
return;
}
if (curr->stackingNode() == ancestorStackingContextNode)
return;
}
}
LayoutPoint RenderLayer::positionFromPaintInvalidationBacking(const RenderObject* renderObject, const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
{
FloatPoint point = renderObject->localToContainerPoint(FloatPoint(), paintInvalidationContainer, 0, 0, paintInvalidationState);
// FIXME: Eventually we are going to unify coordinates in GraphicsLayer space.
if (paintInvalidationContainer && paintInvalidationContainer->layer()->groupedMapping())
mapPointToPaintBackingCoordinates(paintInvalidationContainer, point);
return LayoutPoint(point);
}
void RenderLayer::mapPointToPaintBackingCoordinates(const RenderLayerModelObject* paintInvalidationContainer, FloatPoint& point)
{
RenderLayer* paintInvalidationLayer = paintInvalidationContainer->layer();
if (!paintInvalidationLayer->groupedMapping()) {
point.move(paintInvalidationLayer->compositedLayerMapping()->contentOffsetInCompositingLayer());
return;
}
RenderLayerModelObject* transformedAncestor = paintInvalidationLayer->enclosingTransformedAncestor()->renderer();
if (!transformedAncestor)
return;
// |paintInvalidationContainer| may have a local 2D transform on it, so take that into account when mapping into the space of the
// transformed ancestor.
point = paintInvalidationContainer->localToContainerPoint(point, transformedAncestor);
point.moveBy(-paintInvalidationLayer->groupedMapping()->squashingOffsetFromTransformedAncestor());
}
void RenderLayer::mapRectToPaintBackingCoordinates(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect& rect)
{
RenderLayer* paintInvalidationLayer = paintInvalidationContainer->layer();
if (!paintInvalidationLayer->groupedMapping()) {
rect.move(paintInvalidationLayer->compositedLayerMapping()->contentOffsetInCompositingLayer());
return;
}
RenderLayerModelObject* transformedAncestor = paintInvalidationLayer->enclosingTransformedAncestor()->renderer();
if (!transformedAncestor)
return;
// |paintInvalidationContainer| may have a local 2D transform on it, so take that into account when mapping into the space of the
// transformed ancestor.
rect = LayoutRect(paintInvalidationContainer->localToContainerQuad(FloatRect(rect), transformedAncestor).boundingBox());
rect.moveBy(-paintInvalidationLayer->groupedMapping()->squashingOffsetFromTransformedAncestor());
}
void RenderLayer::mapRectToPaintInvalidationBacking(const RenderObject* renderObject, const RenderLayerModelObject* paintInvalidationContainer, LayoutRect& rect, const PaintInvalidationState* paintInvalidationState)
{
if (!paintInvalidationContainer->layer()->groupedMapping()) {
renderObject->mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, paintInvalidationState);
return;
}
// This code adjusts the paint invalidation rectangle to be in the space of the transformed ancestor of the grouped (i.e. squashed)
// layer. This is because all layers that squash together need to issue paint invalidations w.r.t. a single container that is
// an ancestor of all of them, in order to properly take into account any local transforms etc.
// FIXME: remove this special-case code that works around the paint invalidation code structure.
renderObject->mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, paintInvalidationState);
mapRectToPaintBackingCoordinates(paintInvalidationContainer, rect);
}
LayoutRect RenderLayer::computePaintInvalidationRect(const RenderObject* renderObject, const RenderLayer* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
{
if (!paintInvalidationContainer->groupedMapping())
return renderObject->computePaintInvalidationRect(paintInvalidationContainer->renderer(), paintInvalidationState);
LayoutRect rect = renderObject->clippedOverflowRectForPaintInvalidation(paintInvalidationContainer->renderer(), paintInvalidationState);
mapRectToPaintBackingCoordinates(paintInvalidationContainer->renderer(), rect);
return rect;
}
void RenderLayer::dirtyVisibleContentStatus()
{
m_visibleContentStatusDirty = true;
if (parent())
parent()->dirtyAncestorChainVisibleDescendantStatus();
}
void RenderLayer::potentiallyDirtyVisibleContentStatus(EVisibility visibility)
{
if (m_visibleContentStatusDirty)
return;
if (hasVisibleContent() == (visibility == VISIBLE))
return;
dirtyVisibleContentStatus();
}
void RenderLayer::dirtyAncestorChainVisibleDescendantStatus()
{
for (RenderLayer* layer = this; layer; layer = layer->parent()) {
if (layer->m_visibleDescendantStatusDirty)
break;
layer->m_visibleDescendantStatusDirty = true;
}
}
// FIXME: this is quite brute-force. We could be more efficient if we were to
// track state and update it as appropriate as changes are made in the Render tree.
void RenderLayer::updateScrollingStateAfterCompositingChange()
{
TRACE_EVENT0("blink", "RenderLayer::updateScrollingStateAfterCompositingChange");
m_hasVisibleNonLayerContent = false;
for (RenderObject* r = renderer()->slowFirstChild(); r; r = r->nextSibling()) {
if (!r->hasLayer()) {
m_hasVisibleNonLayerContent = true;
break;
}
}
m_hasNonCompositedChild = false;
for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
if (child->compositingState() == NotComposited) {
m_hasNonCompositedChild = true;
return;
}
}
}
// The descendant-dependent flags system is badly broken because we clean dirty
// bits in upward tree walks, which means we need to call updateDescendantDependentFlags
// at every node in the tree to fully clean all the dirty bits. While we'll in
// the process of fixing this issue, updateDescendantDependentFlagsForEntireSubtree
// provides a big hammer for actually cleaning all the dirty bits in a subtree.
//
// FIXME: Remove this function once the descendant-dependent flags system keeps
// its dirty bits scoped to subtrees.
void RenderLayer::updateDescendantDependentFlagsForEntireSubtree()
{
updateDescendantDependentFlags();
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->updateDescendantDependentFlagsForEntireSubtree();
}
void RenderLayer::updateDescendantDependentFlags()
{
if (m_visibleDescendantStatusDirty) {
m_hasVisibleDescendant = false;
for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
child->updateDescendantDependentFlags();
if (child->m_hasVisibleContent || child->m_hasVisibleDescendant) {
m_hasVisibleDescendant = true;
break;
}
}
m_visibleDescendantStatusDirty = false;
}
if (m_visibleContentStatusDirty) {
bool previouslyHasVisibleContent = m_hasVisibleContent;
if (renderer()->style()->visibility() == VISIBLE)
m_hasVisibleContent = true;
else {
// layer may be hidden but still have some visible content, check for this
m_hasVisibleContent = false;
RenderObject* r = renderer()->slowFirstChild();
while (r) {
if (r->style()->visibility() == VISIBLE && !r->hasLayer()) {
m_hasVisibleContent = true;
break;
}
RenderObject* rendererFirstChild = r->slowFirstChild();
if (rendererFirstChild && !r->hasLayer())
r = rendererFirstChild;
else if (r->nextSibling())
r = r->nextSibling();
else {
do {
r = r->parent();
if (r == renderer())
r = 0;
} while (r && !r->nextSibling());
if (r)
r = r->nextSibling();
}
}
}
m_visibleContentStatusDirty = false;
if (hasVisibleContent() != previouslyHasVisibleContent) {
setNeedsCompositingInputsUpdate();
// We need to tell m_renderer to recheck its rect because we
// pretend that invisible RenderObjects have 0x0 rects. Changing
// visibility therefore changes our rect and we need to visit
// this RenderObject during the invalidateTreeIfNeeded walk.
m_renderer->setMayNeedPaintInvalidation(true);
}
}
}
void RenderLayer::dirty3DTransformedDescendantStatus()
{
RenderLayerStackingNode* stackingNode = m_stackingNode->ancestorStackingContextNode();
if (!stackingNode)
return;
stackingNode->layer()->m_3DTransformedDescendantStatusDirty = true;
// This propagates up through preserve-3d hierarchies to the enclosing flattening layer.
// Note that preserves3D() creates stacking context, so we can just run up the stacking containers.
while (stackingNode && stackingNode->layer()->preserves3D()) {
stackingNode->layer()->m_3DTransformedDescendantStatusDirty = true;
stackingNode = stackingNode->ancestorStackingContextNode();
}
}
// Return true if this layer or any preserve-3d descendants have 3d.
bool RenderLayer::update3DTransformedDescendantStatus()
{
if (m_3DTransformedDescendantStatusDirty) {
m_has3DTransformedDescendant = false;
m_stackingNode->updateZOrderLists();
// Transformed or preserve-3d descendants can only be in the z-order lists, not
// in the normal flow list, so we only need to check those.
RenderLayerStackingNodeIterator iterator(*m_stackingNode.get(), PositiveZOrderChildren | NegativeZOrderChildren);
while (RenderLayerStackingNode* node = iterator.next())
m_has3DTransformedDescendant |= node->layer()->update3DTransformedDescendantStatus();
m_3DTransformedDescendantStatusDirty = false;
}
// If we live in a 3d hierarchy, then the layer at the root of that hierarchy needs
// the m_has3DTransformedDescendant set.
if (preserves3D())
return has3DTransform() || m_has3DTransformedDescendant;
return has3DTransform();
}
IntSize RenderLayer::size() const
{
if (renderer()->isInline() && renderer()->isRenderInline())
return toRenderInline(renderer())->linesBoundingBox().size();
// FIXME: Is snapping the size really needed here?
if (RenderBox* box = renderBox())
return pixelSnappedIntSize(box->size(), box->location());
return IntSize();
}
LayoutPoint RenderLayer::location() const
{
LayoutPoint localPoint;
LayoutSize inlineBoundingBoxOffset; // We don't put this into the RenderLayer x/y for inlines, so we need to subtract it out when done.
if (renderer()->isInline() && renderer()->isRenderInline()) {
RenderInline* inlineFlow = toRenderInline(renderer());
IntRect lineBox = inlineFlow->linesBoundingBox();
inlineBoundingBoxOffset = toSize(lineBox.location());
localPoint += inlineBoundingBoxOffset;
} else if (RenderBox* box = renderBox()) {
localPoint += box->topLeftLocationOffset();
}
if (!renderer()->isOutOfFlowPositioned() && renderer()->parent()) {
// We must adjust our position by walking up the render tree looking for the
// nearest enclosing object with a layer.
RenderObject* curr = renderer()->parent();
while (curr && !curr->hasLayer()) {
if (curr->isBox() && !curr->isTableRow()) {
// Rows and cells share the same coordinate space (that of the section).
// Omit them when computing our xpos/ypos.
localPoint += toRenderBox(curr)->topLeftLocationOffset();
}
curr = curr->parent();
}
if (curr->isBox() && curr->isTableRow()) {
// Put ourselves into the row coordinate space.
localPoint -= toRenderBox(curr)->topLeftLocationOffset();
}
}
// Subtract our parent's scroll offset.
if (renderer()->isOutOfFlowPositioned() && enclosingPositionedAncestor()) {
RenderLayer* positionedParent = enclosingPositionedAncestor();
// For positioned layers, we subtract out the enclosing positioned layer's scroll offset.
if (positionedParent->renderer()->hasOverflowClip()) {
LayoutSize offset = positionedParent->renderBox()->scrolledContentOffset();
localPoint -= offset;
}
if (positionedParent->renderer()->isRelPositioned() && positionedParent->renderer()->isRenderInline()) {
LayoutSize offset = toRenderInline(positionedParent->renderer())->offsetForInFlowPositionedInline(*toRenderBox(renderer()));
localPoint += offset;
}
} else if (parent()) {
// FIXME: This code is very wrong, but luckily only needed in the old/current multicol
// implementation. The compositing system doesn't understand columns and we're hacking
// around that fact by faking the position of the RenderLayers when we think we'll end up
// being composited.
if (hasStyleDeterminedDirectCompositingReasons() && !useRegionBasedColumns()) {
// FIXME: Composited layers ignore pagination, so about the best we can do is make sure they're offset into the appropriate column.
// They won't split across columns properly.
if (!parent()->renderer()->hasColumns() && parent()->renderer()->isDocumentElement() && renderer()->view()->hasColumns())
localPoint += renderer()->view()->columnOffset(localPoint);
else
localPoint += parent()->renderer()->columnOffset(localPoint);
}
if (parent()->renderer()->hasOverflowClip()) {
IntSize scrollOffset = parent()->renderBox()->scrolledContentOffset();
localPoint -= scrollOffset;
}
}
localPoint.move(offsetForInFlowPosition());
// FIXME: We'd really like to just get rid of the concept of a layer rectangle and rely on the renderers.
localPoint -= inlineBoundingBoxOffset;
return localPoint;
}
const LayoutSize RenderLayer::offsetForInFlowPosition() const
{
return renderer()->isRelPositioned() ? toRenderBoxModelObject(renderer())->offsetForInFlowPosition() : LayoutSize();
}
TransformationMatrix RenderLayer::perspectiveTransform() const
{
if (!renderer()->hasTransformRelatedProperty())
return TransformationMatrix();
RenderStyle* style = renderer()->style();
if (!style->hasPerspective())
return TransformationMatrix();
// Maybe fetch the perspective from the backing?
const IntRect borderBox = toRenderBox(renderer())->pixelSnappedBorderBoxRect();
const float boxWidth = borderBox.width();
const float boxHeight = borderBox.height();
float perspectiveOriginX = floatValueForLength(style->perspectiveOriginX(), boxWidth);
float perspectiveOriginY = floatValueForLength(style->perspectiveOriginY(), boxHeight);
// A perspective origin of 0,0 makes the vanishing point in the center of the element.
// We want it to be in the top-left, so subtract half the height and width.
perspectiveOriginX -= boxWidth / 2.0f;
perspectiveOriginY -= boxHeight / 2.0f;
TransformationMatrix t;
t.translate(perspectiveOriginX, perspectiveOriginY);
t.applyPerspective(style->perspective());
t.translate(-perspectiveOriginX, -perspectiveOriginY);
return t;
}
FloatPoint RenderLayer::perspectiveOrigin() const
{
if (!renderer()->hasTransformRelatedProperty())
return FloatPoint();
const LayoutRect borderBox = toRenderBox(renderer())->borderBoxRect();
RenderStyle* style = renderer()->style();
return FloatPoint(floatValueForLength(style->perspectiveOriginX(), borderBox.width().toFloat()), floatValueForLength(style->perspectiveOriginY(), borderBox.height().toFloat()));
}
static inline bool isFixedPositionedContainer(RenderLayer* layer)
{
return layer->isRootLayer() || layer->hasTransformRelatedProperty();
}
RenderLayer* RenderLayer::enclosingPositionedAncestor() const
{
RenderLayer* curr = parent();
while (curr && !curr->isPositionedContainer())
curr = curr->parent();
return curr;
}
RenderLayer* RenderLayer::enclosingTransformedAncestor() const
{
RenderLayer* curr = parent();
while (curr && !curr->isRootLayer() && !curr->renderer()->hasTransformRelatedProperty())
curr = curr->parent();
return curr;
}
LayoutPoint RenderLayer::computeOffsetFromTransformedAncestor() const
{
const AncestorDependentCompositingInputs& properties = ancestorDependentCompositingInputs();
TransformState transformState(TransformState::ApplyTransformDirection, FloatPoint());
// FIXME: add a test that checks flipped writing mode and ApplyContainerFlip are correct.
renderer()->mapLocalToContainer(properties.transformAncestor ? properties.transformAncestor->renderer() : 0, transformState, ApplyContainerFlip);
transformState.flatten();
return LayoutPoint(transformState.lastPlanarPoint());
}
const RenderLayer* RenderLayer::compositingContainer() const
{
if (stackingNode()->isNormalFlowOnly())
return parent();
if (RenderLayerStackingNode* ancestorStackingNode = stackingNode()->ancestorStackingContextNode())
return ancestorStackingNode->layer();
return 0;
}
bool RenderLayer::isPaintInvalidationContainer() const
{
return compositingState() == PaintsIntoOwnBacking || compositingState() == PaintsIntoGroupedBacking;
}
// Note: enclosingCompositingLayer does not include squashed layers. Compositing stacking children of squashed layers
// receive graphics layers that are parented to the compositing ancestor of the squashed layer.
RenderLayer* RenderLayer::enclosingLayerWithCompositedLayerMapping(IncludeSelfOrNot includeSelf) const
{
ASSERT(isAllowedToQueryCompositingState());
if ((includeSelf == IncludeSelf) && compositingState() != NotComposited && compositingState() != PaintsIntoGroupedBacking)
return const_cast<RenderLayer*>(this);
for (const RenderLayer* curr = compositingContainer(); curr; curr = curr->compositingContainer()) {
if (curr->compositingState() != NotComposited && curr->compositingState() != PaintsIntoGroupedBacking)
return const_cast<RenderLayer*>(curr);
}
return 0;
}
// Return the enclosingCompositedLayerForPaintInvalidation for the given RenderLayer
// including crossing frame boundaries.
RenderLayer* RenderLayer::enclosingLayerForPaintInvalidationCrossingFrameBoundaries() const
{
const RenderLayer* layer = this;
RenderLayer* compositedLayer = 0;
while (!compositedLayer) {
compositedLayer = layer->enclosingLayerForPaintInvalidation();
if (!compositedLayer) {
RenderObject* owner = layer->renderer()->frame()->ownerRenderer();
if (!owner)
break;
layer = owner->enclosingLayer();
}
}
return compositedLayer;
}
RenderLayer* RenderLayer::enclosingLayerForPaintInvalidation() const
{
ASSERT(isAllowedToQueryCompositingState());
if (isPaintInvalidationContainer())
return const_cast<RenderLayer*>(this);
for (const RenderLayer* curr = parent(); curr; curr = curr->parent()) {
if (curr->isPaintInvalidationContainer())
return const_cast<RenderLayer*>(curr);
}
return 0;
}
void RenderLayer::setNeedsCompositingInputsUpdate()
{
m_needsAncestorDependentCompositingInputsUpdate = true;
m_needsDescendantDependentCompositingInputsUpdate = true;
for (RenderLayer* current = this; current && !current->m_childNeedsCompositingInputsUpdate; current = current->parent())
current->m_childNeedsCompositingInputsUpdate = true;
compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
}
void RenderLayer::updateAncestorDependentCompositingInputs(const AncestorDependentCompositingInputs& compositingInputs)
{
m_ancestorDependentCompositingInputs = compositingInputs;
m_needsAncestorDependentCompositingInputsUpdate = false;
}
void RenderLayer::updateDescendantDependentCompositingInputs(const DescendantDependentCompositingInputs& compositingInputs)
{
m_descendantDependentCompositingInputs = compositingInputs;
m_needsDescendantDependentCompositingInputsUpdate = false;
}
void RenderLayer::didUpdateCompositingInputs()
{
ASSERT(!needsCompositingInputsUpdate());
m_childNeedsCompositingInputsUpdate = false;
if (m_scrollableArea)
m_scrollableArea->updateNeedsCompositedScrolling();
}
void RenderLayer::setCompositingReasons(CompositingReasons reasons, CompositingReasons mask)
{
if ((compositingReasons() & mask) == (reasons & mask))
return;
m_compositingReasons = (reasons & mask) | (compositingReasons() & ~mask);
}
void RenderLayer::setHasCompositingDescendant(bool hasCompositingDescendant)
{
if (m_hasCompositingDescendant == static_cast<unsigned>(hasCompositingDescendant))
return;
m_hasCompositingDescendant = hasCompositingDescendant;
if (hasCompositedLayerMapping())
compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateLocal);
}
void RenderLayer::setShouldIsolateCompositedDescendants(bool shouldIsolateCompositedDescendants)
{
if (m_shouldIsolateCompositedDescendants == static_cast<unsigned>(shouldIsolateCompositedDescendants))
return;
m_shouldIsolateCompositedDescendants = shouldIsolateCompositedDescendants;
if (hasCompositedLayerMapping())
compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateLocal);
}
bool RenderLayer::hasAncestorWithFilterOutsets() const
{
for (const RenderLayer* curr = this; curr; curr = curr->parent()) {
RenderLayerModelObject* renderer = curr->renderer();
if (renderer->style()->hasFilterOutsets())
return true;
}
return false;
}
RenderLayer* RenderLayer::transparentPaintingAncestor()
{
if (hasCompositedLayerMapping())
return 0;
for (RenderLayer* curr = parent(); curr; curr = curr->parent()) {
if (curr->hasCompositedLayerMapping())
return 0;
if (curr->isTransparent())
return curr;
}
return 0;
}
static void expandClipRectForDescendantsAndReflection(LayoutRect& clipRect, const RenderLayer* layer, const RenderLayer* rootLayer,
RenderLayer::TransparencyClipBoxBehavior transparencyBehavior, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
{
// If we have a mask, then the clip is limited to the border box area (and there is
// no need to examine child layers).
if (!layer->renderer()->hasMask()) {
// Note: we don't have to walk z-order lists since transparent elements always establish
// a stacking container. This means we can just walk the layer tree directly.
for (RenderLayer* curr = layer->firstChild(); curr; curr = curr->nextSibling()) {
if (!layer->reflectionInfo() || layer->reflectionInfo()->reflectionLayer() != curr)
clipRect.unite(RenderLayer::transparencyClipBox(curr, rootLayer, transparencyBehavior, RenderLayer::DescendantsOfTransparencyClipBox, subPixelAccumulation, paintBehavior));
}
}
// If we have a reflection, then we need to account for that when we push the clip. Reflect our entire
// current transparencyClipBox to catch all child layers.
// FIXME: Accelerated compositing will eventually want to do something smart here to avoid incorporating this
// size into the parent layer.
if (layer->renderer()->hasReflection()) {
LayoutPoint delta;
layer->convertToLayerCoords(rootLayer, delta);
clipRect.move(-delta.x(), -delta.y());
clipRect.unite(layer->renderBox()->reflectedRect(clipRect));
clipRect.moveBy(delta);
}
}
LayoutRect RenderLayer::transparencyClipBox(const RenderLayer* layer, const RenderLayer* rootLayer, TransparencyClipBoxBehavior transparencyBehavior,
TransparencyClipBoxMode transparencyMode, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
{
// FIXME: Although this function completely ignores CSS-imposed clipping, we did already intersect with the
// paintDirtyRect, and that should cut down on the amount we have to paint. Still it
// would be better to respect clips.
if (rootLayer != layer && ((transparencyBehavior == PaintingTransparencyClipBox && layer->paintsWithTransform(paintBehavior))
|| (transparencyBehavior == HitTestingTransparencyClipBox && layer->hasTransformRelatedProperty()))) {
// The best we can do here is to use enclosed bounding boxes to establish a "fuzzy" enough clip to encompass
// the transformed layer and all of its children.
const RenderLayer* paginationLayer = transparencyMode == DescendantsOfTransparencyClipBox ? layer->enclosingPaginationLayer() : 0;
const RenderLayer* rootLayerForTransform = paginationLayer ? paginationLayer : rootLayer;
LayoutPoint delta;
layer->convertToLayerCoords(rootLayerForTransform, delta);
delta.move(subPixelAccumulation);
IntPoint pixelSnappedDelta = roundedIntPoint(delta);
TransformationMatrix transform;
transform.translate(pixelSnappedDelta.x(), pixelSnappedDelta.y());
transform = transform * *layer->transform();
// We don't use fragment boxes when collecting a transformed layer's bounding box, since it always
// paints unfragmented.
LayoutRect clipRect = layer->physicalBoundingBox(layer);
expandClipRectForDescendantsAndReflection(clipRect, layer, layer, transparencyBehavior, subPixelAccumulation, paintBehavior);
layer->renderer()->style()->filterOutsets().expandRect(clipRect);
LayoutRect result = transform.mapRect(clipRect);
if (!paginationLayer)
return result;
// We have to break up the transformed extent across our columns.
// Split our box up into the actual fragment boxes that render in the columns/pages and unite those together to
// get our true bounding box.
RenderFlowThread* enclosingFlowThread = toRenderFlowThread(paginationLayer->renderer());
result = enclosingFlowThread->fragmentsBoundingBox(result);
LayoutPoint rootLayerDelta;
paginationLayer->convertToLayerCoords(rootLayer, rootLayerDelta);
result.moveBy(rootLayerDelta);
return result;
}
LayoutRect clipRect = layer->fragmentsBoundingBox(rootLayer);
expandClipRectForDescendantsAndReflection(clipRect, layer, rootLayer, transparencyBehavior, subPixelAccumulation, paintBehavior);
layer->renderer()->style()->filterOutsets().expandRect(clipRect);
clipRect.move(subPixelAccumulation);
return clipRect;
}
LayoutRect RenderLayer::paintingExtent(const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
{
return intersection(transparencyClipBox(this, rootLayer, PaintingTransparencyClipBox, RootOfTransparencyClipBox, subPixelAccumulation, paintBehavior), paintDirtyRect);
}
void* RenderLayer::operator new(size_t sz)
{
return partitionAlloc(Partitions::getRenderingPartition(), sz);
}
void RenderLayer::operator delete(void* ptr)
{
partitionFree(ptr);
}
void RenderLayer::addChild(RenderLayer* child, RenderLayer* beforeChild)
{
RenderLayer* prevSibling = beforeChild ? beforeChild->previousSibling() : lastChild();
if (prevSibling) {
child->setPreviousSibling(prevSibling);
prevSibling->setNextSibling(child);
ASSERT(prevSibling != child);
} else
setFirstChild(child);
if (beforeChild) {
beforeChild->setPreviousSibling(child);
child->setNextSibling(beforeChild);
ASSERT(beforeChild != child);
} else
setLastChild(child);
child->m_parent = this;
setNeedsCompositingInputsUpdate();
if (child->stackingNode()->isNormalFlowOnly())
m_stackingNode->dirtyNormalFlowList();
if (!child->stackingNode()->isNormalFlowOnly() || child->firstChild()) {
// Dirty the z-order list in which we are contained. The ancestorStackingContextNode() can be null in the
// case where we're building up generated content layers. This is ok, since the lists will start
// off dirty in that case anyway.
child->stackingNode()->dirtyStackingContextZOrderLists();
}
dirtyAncestorChainVisibleDescendantStatus();
dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
child->updateDescendantDependentFlags();
}
RenderLayer* RenderLayer::removeChild(RenderLayer* oldChild)
{
if (oldChild->previousSibling())
oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
if (oldChild->nextSibling())
oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
if (m_first == oldChild)
m_first = oldChild->nextSibling();
if (m_last == oldChild)
m_last = oldChild->previousSibling();
if (oldChild->stackingNode()->isNormalFlowOnly())
m_stackingNode->dirtyNormalFlowList();
if (!oldChild->stackingNode()->isNormalFlowOnly() || oldChild->firstChild()) {
// Dirty the z-order list in which we are contained. When called via the
// reattachment process in removeOnlyThisLayer, the layer may already be disconnected
// from the main layer tree, so we need to null-check the
// |stackingContext| value.
oldChild->stackingNode()->dirtyStackingContextZOrderLists();
}
if (renderer()->style()->visibility() != VISIBLE)
dirtyVisibleContentStatus();
oldChild->setPreviousSibling(0);
oldChild->setNextSibling(0);
oldChild->m_parent = 0;
dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
oldChild->updateDescendantDependentFlags();
if (oldChild->m_hasVisibleContent || oldChild->m_hasVisibleDescendant)
dirtyAncestorChainVisibleDescendantStatus();
return oldChild;
}
void RenderLayer::removeOnlyThisLayer()
{
if (!m_parent)
return;
m_clipper.clearClipRectsIncludingDescendants();
RenderLayer* nextSib = nextSibling();
// Remove the child reflection layer before moving other child layers.
// The reflection layer should not be moved to the parent.
if (m_reflectionInfo)
removeChild(m_reflectionInfo->reflectionLayer());
// Now walk our kids and reattach them to our parent.
RenderLayer* current = m_first;
while (current) {
RenderLayer* next = current->nextSibling();
removeChild(current);
m_parent->addChild(current, nextSib);
// FIXME: We should call a specialized version of this function.
current->updateLayerPositionsAfterLayout();
current = next;
}
// Remove us from the parent.
m_parent->removeChild(this);
m_renderer->destroyLayer();
}
void RenderLayer::insertOnlyThisLayer()
{
if (!m_parent && renderer()->parent()) {
// We need to connect ourselves when our renderer() has a parent.
// Find our enclosingLayer and add ourselves.
RenderLayer* parentLayer = renderer()->parent()->enclosingLayer();
ASSERT(parentLayer);
RenderLayer* beforeChild = !parentLayer->reflectionInfo() || parentLayer->reflectionInfo()->reflectionLayer() != this ? renderer()->parent()->findNextLayer(parentLayer, renderer()) : 0;
parentLayer->addChild(this, beforeChild);
}
// Remove all descendant layers from the hierarchy and add them to the new position.
for (RenderObject* curr = renderer()->slowFirstChild(); curr; curr = curr->nextSibling())
curr->moveLayers(m_parent, this);
// Clear out all the clip rects.
m_clipper.clearClipRectsIncludingDescendants();
}
// Returns the layer reached on the walk up towards the ancestor.
static inline const RenderLayer* accumulateOffsetTowardsAncestor(const RenderLayer* layer, const RenderLayer* ancestorLayer, LayoutPoint& location)
{
ASSERT(ancestorLayer != layer);
const RenderLayerModelObject* renderer = layer->renderer();
EPosition position = renderer->style()->position();
// FIXME: Positioning of out-of-flow(fixed, absolute) elements collected in a RenderFlowThread
// may need to be revisited in a future patch.
// If the fixed renderer is inside a RenderFlowThread, we should not compute location using localToAbsolute,
// since localToAbsolute maps the coordinates from flow thread to regions coordinates and regions can be
// positioned in a completely different place in the viewport (RenderView).
if (position == FixedPosition && (!ancestorLayer || ancestorLayer == renderer->view()->layer())) {
// If the fixed layer's container is the root, just add in the offset of the view. We can obtain this by calling
// localToAbsolute() on the RenderView.
FloatPoint absPos = renderer->localToAbsolute(FloatPoint(), IsFixed);
location += LayoutSize(absPos.x(), absPos.y());
return ancestorLayer;
}
// For the fixed positioned elements inside a render flow thread, we should also skip the code path below
// Otherwise, for the case of ancestorLayer == rootLayer and fixed positioned element child of a transformed
// element in render flow thread, we will hit the fixed positioned container before hitting the ancestor layer.
if (position == FixedPosition) {
// For a fixed layers, we need to walk up to the root to see if there's a fixed position container
// (e.g. a transformed layer). It's an error to call convertToLayerCoords() across a layer with a transform,
// so we should always find the ancestor at or before we find the fixed position container.
RenderLayer* fixedPositionContainerLayer = 0;
bool foundAncestor = false;
for (RenderLayer* currLayer = layer->parent(); currLayer; currLayer = currLayer->parent()) {
if (currLayer == ancestorLayer)
foundAncestor = true;
if (isFixedPositionedContainer(currLayer)) {
fixedPositionContainerLayer = currLayer;
ASSERT_UNUSED(foundAncestor, foundAncestor);
break;
}
}
ASSERT(fixedPositionContainerLayer); // We should have hit the RenderView's layer at least.
if (fixedPositionContainerLayer != ancestorLayer) {
LayoutPoint fixedContainerCoords;
layer->convertToLayerCoords(fixedPositionContainerLayer, fixedContainerCoords);
LayoutPoint ancestorCoords;
ancestorLayer->convertToLayerCoords(fixedPositionContainerLayer, ancestorCoords);
location += (fixedContainerCoords - ancestorCoords);
} else {
location += toSize(layer->location());
}
return ancestorLayer;
}
RenderLayer* parentLayer;
if (position == AbsolutePosition || position == FixedPosition) {
// Do what enclosingPositionedAncestor() does, but check for ancestorLayer along the way.
parentLayer = layer->parent();
bool foundAncestorFirst = false;
while (parentLayer) {
// RenderFlowThread is a positioned container, child of RenderView, positioned at (0,0).
// This implies that, for out-of-flow positioned elements inside a RenderFlowThread,
// we are bailing out before reaching root layer.
if (parentLayer->isPositionedContainer())
break;
if (parentLayer == ancestorLayer) {
foundAncestorFirst = true;
break;
}
parentLayer = parentLayer->parent();
}
// We should not reach RenderView layer past the RenderFlowThread layer for any
// children of the RenderFlowThread.
ASSERT(!renderer->flowThreadContainingBlock() || parentLayer != renderer->view()->layer());
if (foundAncestorFirst) {
// Found ancestorLayer before the abs. positioned container, so compute offset of both relative
// to enclosingPositionedAncestor and subtract.
RenderLayer* positionedAncestor = parentLayer->enclosingPositionedAncestor();
LayoutPoint thisCoords;
layer->convertToLayerCoords(positionedAncestor, thisCoords);
LayoutPoint ancestorCoords;
ancestorLayer->convertToLayerCoords(positionedAncestor, ancestorCoords);
location += (thisCoords - ancestorCoords);
return ancestorLayer;
}
} else
parentLayer = layer->parent();
if (!parentLayer)
return 0;
location += toSize(layer->location());
return parentLayer;
}
void RenderLayer::convertToLayerCoords(const RenderLayer* ancestorLayer, LayoutPoint& location) const
{
if (ancestorLayer == this)
return;
const RenderLayer* currLayer = this;
while (currLayer && currLayer != ancestorLayer)
currLayer = accumulateOffsetTowardsAncestor(currLayer, ancestorLayer, location);
}
void RenderLayer::convertToLayerCoords(const RenderLayer* ancestorLayer, LayoutRect& rect) const
{
LayoutPoint delta;
convertToLayerCoords(ancestorLayer, delta);
rect.moveBy(delta);
}
void RenderLayer::didUpdateNeedsCompositedScrolling()
{
updateSelfPaintingLayer();
}
void RenderLayer::updateReflectionInfo(const RenderStyle* oldStyle)
{
ASSERT(!oldStyle || !renderer()->style()->reflectionDataEquivalent(oldStyle));
if (renderer()->hasReflection()) {
if (!m_reflectionInfo)
m_reflectionInfo = adoptPtrWillBeNoop(new RenderLayerReflectionInfo(*renderBox()));
m_reflectionInfo->updateAfterStyleChange(oldStyle);
} else if (m_reflectionInfo) {
m_reflectionInfo->destroy();
m_reflectionInfo = nullptr;
}
}
void RenderLayer::updateStackingNode()
{
if (requiresStackingNode())
m_stackingNode = adoptPtr(new RenderLayerStackingNode(this));
else
m_stackingNode = nullptr;
}
void RenderLayer::updateScrollableArea()
{
if (requiresScrollableArea())
m_scrollableArea = adoptPtr(new RenderLayerScrollableArea(*this));
else
m_scrollableArea = nullptr;
}
bool RenderLayer::hasOverflowControls() const
{
return m_scrollableArea && (m_scrollableArea->hasScrollbar() || m_scrollableArea->hasScrollCorner() || renderer()->style()->resize() != RESIZE_NONE);
}
void RenderLayer::collectFragments(LayerFragments& fragments, const RenderLayer* rootLayer, const LayoutRect& dirtyRect,
ClipRectsCacheSlot clipRectsCacheSlot, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy, ShouldRespectOverflowClip respectOverflowClip, const LayoutPoint* offsetFromRoot,
const LayoutSize& subPixelAccumulation, const LayoutRect* layerBoundingBox)
{
if (!enclosingPaginationLayer() || hasTransformRelatedProperty()) {
// For unpaginated layers, there is only one fragment.
LayerFragment fragment;
ClipRectsContext clipRectsContext(rootLayer, clipRectsCacheSlot, inOverlayScrollbarSizeRelevancy, subPixelAccumulation);
if (respectOverflowClip == IgnoreOverflowClip)
clipRectsContext.setIgnoreOverflowClip();
clipper().calculateRects(clipRectsContext, dirtyRect, fragment.layerBounds, fragment.backgroundRect, fragment.foregroundRect, fragment.outlineRect, offsetFromRoot);
fragments.append(fragment);
return;
}
// Compute our offset within the enclosing pagination layer.
LayoutPoint offsetWithinPaginatedLayer;
convertToLayerCoords(enclosingPaginationLayer(), offsetWithinPaginatedLayer);
// Calculate clip rects relative to the enclosingPaginationLayer. The purpose of this call is to determine our bounds clipped to intermediate
// layers between us and the pagination context. It's important to minimize the number of fragments we need to create and this helps with that.
ClipRectsContext paginationClipRectsContext(enclosingPaginationLayer(), clipRectsCacheSlot, inOverlayScrollbarSizeRelevancy);
if (respectOverflowClip == IgnoreOverflowClip)
paginationClipRectsContext.setIgnoreOverflowClip();
LayoutRect layerBoundsInFlowThread;
ClipRect backgroundRectInFlowThread;
ClipRect foregroundRectInFlowThread;
ClipRect outlineRectInFlowThread;
clipper().calculateRects(paginationClipRectsContext, PaintInfo::infiniteRect(), layerBoundsInFlowThread, backgroundRectInFlowThread, foregroundRectInFlowThread,
outlineRectInFlowThread, &offsetWithinPaginatedLayer);
// Take our bounding box within the flow thread and clip it.
LayoutRect layerBoundingBoxInFlowThread = layerBoundingBox ? *layerBoundingBox : physicalBoundingBox(enclosingPaginationLayer(), &offsetWithinPaginatedLayer);
layerBoundingBoxInFlowThread.intersect(backgroundRectInFlowThread.rect());
// Make the dirty rect relative to the fragmentation context (multicol container, etc.).
RenderFlowThread* enclosingFlowThread = toRenderFlowThread(enclosingPaginationLayer()->renderer());
LayoutPoint offsetOfPaginationLayerFromRoot;
// FIXME: more work needed if there are nested pagination layers.
if (rootLayer != enclosingPaginationLayer() && rootLayer->enclosingPaginationLayer() == enclosingPaginationLayer()) {
// The root layer is inside the fragmentation context. So we need to look inside it and find
// the visual offset from the fragmentation context.
LayoutPoint flowThreadOffset;
rootLayer->convertToLayerCoords(enclosingPaginationLayer(), flowThreadOffset);
offsetOfPaginationLayerFromRoot = -enclosingFlowThread->flowThreadPointToVisualPoint(flowThreadOffset);
} else {
enclosingPaginationLayer()->convertToLayerCoords(rootLayer, offsetOfPaginationLayerFromRoot);
}
LayoutRect dirtyRectInFlowThread(dirtyRect);
dirtyRectInFlowThread.moveBy(-offsetOfPaginationLayerFromRoot);
// Tell the flow thread to collect the fragments. We pass enough information to create a minimal number of fragments based off the pages/columns
// that intersect the actual dirtyRect as well as the pages/columns that intersect our layer's bounding box.
enclosingFlowThread->collectLayerFragments(fragments, layerBoundingBoxInFlowThread, dirtyRectInFlowThread);
if (fragments.isEmpty())
return;
// Get the parent clip rects of the pagination layer, since we need to intersect with that when painting column contents.
ClipRect ancestorClipRect = dirtyRect;
if (enclosingPaginationLayer()->parent()) {
ClipRectsContext clipRectsContext(rootLayer, clipRectsCacheSlot, inOverlayScrollbarSizeRelevancy);
if (respectOverflowClip == IgnoreOverflowClip)
clipRectsContext.setIgnoreOverflowClip();
ancestorClipRect = enclosingPaginationLayer()->clipper().backgroundClipRect(clipRectsContext);
ancestorClipRect.intersect(dirtyRect);
}
for (size_t i = 0; i < fragments.size(); ++i) {
LayerFragment& fragment = fragments.at(i);
// Set our four rects with all clipping applied that was internal to the flow thread.
fragment.setRects(layerBoundsInFlowThread, backgroundRectInFlowThread, foregroundRectInFlowThread, outlineRectInFlowThread);
// Shift to the root-relative physical position used when painting the flow thread in this fragment.
fragment.moveBy(fragment.paginationOffset + offsetOfPaginationLayerFromRoot);
// Intersect the fragment with our ancestor's background clip so that e.g., columns in an overflow:hidden block are
// properly clipped by the overflow.
fragment.intersect(ancestorClipRect.rect());
// Now intersect with our pagination clip. This will typically mean we're just intersecting the dirty rect with the column
// clip, so the column clip ends up being all we apply.
fragment.intersect(fragment.paginationClip);
}
}
static inline LayoutRect frameVisibleRect(RenderObject* renderer)
{
FrameView* frameView = renderer->document().view();
if (!frameView)
return LayoutRect();
return frameView->visibleContentRect();
}
bool RenderLayer::hitTest(const HitTestRequest& request, HitTestResult& result)
{
return hitTest(request, result.hitTestLocation(), result);
}
bool RenderLayer::hitTest(const HitTestRequest& request, const HitTestLocation& hitTestLocation, HitTestResult& result)
{
ASSERT(isSelfPaintingLayer() || hasSelfPaintingLayerDescendant());
// RenderView should make sure to update layout before entering hit testing
ASSERT(!renderer()->frame()->view()->layoutPending());
ASSERT(!renderer()->document().renderView()->needsLayout());
// Start with frameVisibleRect to ensure we include the scrollbars.
LayoutRect hitTestArea = frameVisibleRect(renderer());
if (request.ignoreClipping())
hitTestArea.unite(renderer()->view()->documentRect());
RenderLayer* insideLayer = hitTestLayer(this, 0, request, result, hitTestArea, hitTestLocation, false);
if (!insideLayer) {
// We didn't hit any layer. If we are the root layer and the mouse is -- or just was -- down,
// return ourselves. We do this so mouse events continue getting delivered after a drag has
// exited the WebView, and so hit testing over a scrollbar hits the content document.
// In addtion, it is possible for the mouse to stay in the document but there is no element.
// At that time, the events of the mouse should be fired.
LayoutPoint hitPoint = hitTestLocation.point();
if (!request.isChildFrameHitTest() && ((request.active() || request.release()) || (request.move() && hitTestArea.contains(hitPoint.x(), hitPoint.y()))) && isRootLayer()) {
renderer()->updateHitTestResult(result, toRenderView(renderer())->flipForWritingMode(hitTestLocation.point()));
insideLayer = this;
}
}
// Now determine if the result is inside an anchor - if the urlElement isn't already set.
Node* node = result.innerNode();
if (node && !result.URLElement())
result.setURLElement(node->enclosingLinkEventParentOrSelf());
// Now return whether we were inside this layer (this will always be true for the root
// layer).
return insideLayer;
}
Node* RenderLayer::enclosingElement() const
{
for (RenderObject* r = renderer(); r; r = r->parent()) {
if (Node* e = r->node())
return e;
}
ASSERT_NOT_REACHED();
return 0;
}
bool RenderLayer::isInTopLayer() const
{
Node* node = renderer()->node();
return node && node->isElementNode() && toElement(node)->isInTopLayer();
}
// Compute the z-offset of the point in the transformState.
// This is effectively projecting a ray normal to the plane of ancestor, finding where that
// ray intersects target, and computing the z delta between those two points.
static double computeZOffset(const HitTestingTransformState& transformState)
{
// We got an affine transform, so no z-offset
if (transformState.m_accumulatedTransform.isAffine())
return 0;
// Flatten the point into the target plane
FloatPoint targetPoint = transformState.mappedPoint();
// Now map the point back through the transform, which computes Z.
FloatPoint3D backmappedPoint = transformState.m_accumulatedTransform.mapPoint(FloatPoint3D(targetPoint));
return backmappedPoint.z();
}
PassRefPtr<HitTestingTransformState> RenderLayer::createLocalTransformState(RenderLayer* rootLayer, RenderLayer* containerLayer,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation,
const HitTestingTransformState* containerTransformState,
const LayoutPoint& translationOffset) const
{
RefPtr<HitTestingTransformState> transformState;
LayoutPoint offset;
if (containerTransformState) {
// If we're already computing transform state, then it's relative to the container (which we know is non-null).
transformState = HitTestingTransformState::create(*containerTransformState);
convertToLayerCoords(containerLayer, offset);
} else {
// If this is the first time we need to make transform state, then base it off of hitTestLocation,
// which is relative to rootLayer.
transformState = HitTestingTransformState::create(hitTestLocation.transformedPoint(), hitTestLocation.transformedRect(), FloatQuad(hitTestRect));
convertToLayerCoords(rootLayer, offset);
}
offset.moveBy(translationOffset);
RenderObject* containerRenderer = containerLayer ? containerLayer->renderer() : 0;
if (renderer()->shouldUseTransformFromContainer(containerRenderer)) {
TransformationMatrix containerTransform;
renderer()->getTransformFromContainer(containerRenderer, toLayoutSize(offset), containerTransform);
transformState->applyTransform(containerTransform, HitTestingTransformState::AccumulateTransform);
} else {
transformState->translate(offset.x(), offset.y(), HitTestingTransformState::AccumulateTransform);
}
return transformState;
}
static bool isHitCandidate(const RenderLayer* hitLayer, bool canDepthSort, double* zOffset, const HitTestingTransformState* transformState)
{
if (!hitLayer)
return false;
// The hit layer is depth-sorting with other layers, so just say that it was hit.
if (canDepthSort)
return true;
// We need to look at z-depth to decide if this layer was hit.
if (zOffset) {
ASSERT(transformState);
// This is actually computing our z, but that's OK because the hitLayer is coplanar with us.
double childZOffset = computeZOffset(*transformState);
if (childZOffset > *zOffset) {
*zOffset = childZOffset;
return true;
}
return false;
}
return true;
}
// hitTestLocation and hitTestRect are relative to rootLayer.
// A 'flattening' layer is one preserves3D() == false.
// transformState.m_accumulatedTransform holds the transform from the containing flattening layer.
// transformState.m_lastPlanarPoint is the hitTestLocation in the plane of the containing flattening layer.
// transformState.m_lastPlanarQuad is the hitTestRect as a quad in the plane of the containing flattening layer.
//
// If zOffset is non-null (which indicates that the caller wants z offset information),
// *zOffset on return is the z offset of the hit point relative to the containing flattening layer.
RenderLayer* RenderLayer::hitTestLayer(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation, bool appliedTransform,
const HitTestingTransformState* transformState, double* zOffset)
{
if (!isSelfPaintingLayer() && !hasSelfPaintingLayerDescendant())
return 0;
// The natural thing would be to keep HitTestingTransformState on the stack, but it's big, so we heap-allocate.
// Apply a transform if we have one.
if (transform() && !appliedTransform) {
if (enclosingPaginationLayer())
return hitTestTransformedLayerInFragments(rootLayer, containerLayer, request, result, hitTestRect, hitTestLocation, transformState, zOffset);
// Make sure the parent's clip rects have been calculated.
if (parent()) {
ClipRect clipRect = clipper().backgroundClipRect(ClipRectsContext(rootLayer, RootRelativeClipRects, IncludeOverlayScrollbarSize));
// Go ahead and test the enclosing clip now.
if (!clipRect.intersects(hitTestLocation))
return 0;
}
return hitTestLayerByApplyingTransform(rootLayer, containerLayer, request, result, hitTestRect, hitTestLocation, transformState, zOffset);
}
// Ensure our lists and 3d status are up-to-date.
m_stackingNode->updateLayerListsIfNeeded();
update3DTransformedDescendantStatus();
RefPtr<HitTestingTransformState> localTransformState;
if (appliedTransform) {
// We computed the correct state in the caller (above code), so just reference it.
ASSERT(transformState);
localTransformState = const_cast<HitTestingTransformState*>(transformState);
} else if (transformState || m_has3DTransformedDescendant || preserves3D()) {
// We need transform state for the first time, or to offset the container state, so create it here.
localTransformState = createLocalTransformState(rootLayer, containerLayer, hitTestRect, hitTestLocation, transformState);
}
// Check for hit test on backface if backface-visibility is 'hidden'
if (localTransformState && renderer()->style()->backfaceVisibility() == BackfaceVisibilityHidden) {
TransformationMatrix invertedMatrix = localTransformState->m_accumulatedTransform.inverse();
// If the z-vector of the matrix is negative, the back is facing towards the viewer.
if (invertedMatrix.m33() < 0)
return 0;
}
RefPtr<HitTestingTransformState> unflattenedTransformState = localTransformState;
if (localTransformState && !preserves3D()) {
// Keep a copy of the pre-flattening state, for computing z-offsets for the container
unflattenedTransformState = HitTestingTransformState::create(*localTransformState);
// This layer is flattening, so flatten the state passed to descendants.
localTransformState->flatten();
}
// The following are used for keeping track of the z-depth of the hit point of 3d-transformed
// descendants.
double localZOffset = -std::numeric_limits<double>::infinity();
double* zOffsetForDescendantsPtr = 0;
double* zOffsetForContentsPtr = 0;
bool depthSortDescendants = false;
if (preserves3D()) {
depthSortDescendants = true;
// Our layers can depth-test with our container, so share the z depth pointer with the container, if it passed one down.
zOffsetForDescendantsPtr = zOffset ? zOffset : &localZOffset;
zOffsetForContentsPtr = zOffset ? zOffset : &localZOffset;
} else if (zOffset) {
zOffsetForDescendantsPtr = 0;
// Container needs us to give back a z offset for the hit layer.
zOffsetForContentsPtr = zOffset;
}
// This variable tracks which layer the mouse ends up being inside.
RenderLayer* candidateLayer = 0;
// Begin by walking our list of positive layers from highest z-index down to the lowest z-index.
RenderLayer* hitLayer = hitTestChildren(PositiveZOrderChildren, rootLayer, request, result, hitTestRect, hitTestLocation,
localTransformState.get(), zOffsetForDescendantsPtr, zOffset, unflattenedTransformState.get(), depthSortDescendants);
if (hitLayer) {
if (!depthSortDescendants)
return hitLayer;
candidateLayer = hitLayer;
}
// Now check our overflow objects.
hitLayer = hitTestChildren(NormalFlowChildren, rootLayer, request, result, hitTestRect, hitTestLocation,
localTransformState.get(), zOffsetForDescendantsPtr, zOffset, unflattenedTransformState.get(), depthSortDescendants);
if (hitLayer) {
if (!depthSortDescendants)
return hitLayer;
candidateLayer = hitLayer;
}
// Collect the fragments. This will compute the clip rectangles for each layer fragment.
LayerFragments layerFragments;
collectFragments(layerFragments, rootLayer, hitTestRect, RootRelativeClipRects, IncludeOverlayScrollbarSize);
if (m_scrollableArea && m_scrollableArea->hitTestResizerInFragments(layerFragments, hitTestLocation)) {
renderer()->updateHitTestResult(result, hitTestLocation.point());
return this;
}
// Next we want to see if the mouse pos is inside the child RenderObjects of the layer. Check
// every fragment in reverse order.
if (isSelfPaintingLayer()) {
// Hit test with a temporary HitTestResult, because we only want to commit to 'result' if we know we're frontmost.
HitTestResult tempResult(result.hitTestLocation());
bool insideFragmentForegroundRect = false;
if (hitTestContentsForFragments(layerFragments, request, tempResult, hitTestLocation, HitTestDescendants, insideFragmentForegroundRect)
&& isHitCandidate(this, false, zOffsetForContentsPtr, unflattenedTransformState.get())) {
if (result.isRectBasedTest())
result.append(tempResult);
else
result = tempResult;
if (!depthSortDescendants)
return this;
// Foreground can depth-sort with descendant layers, so keep this as a candidate.
candidateLayer = this;
} else if (insideFragmentForegroundRect && result.isRectBasedTest())
result.append(tempResult);
}
// Now check our negative z-index children.
hitLayer = hitTestChildren(NegativeZOrderChildren, rootLayer, request, result, hitTestRect, hitTestLocation,
localTransformState.get(), zOffsetForDescendantsPtr, zOffset, unflattenedTransformState.get(), depthSortDescendants);
if (hitLayer) {
if (!depthSortDescendants)
return hitLayer;
candidateLayer = hitLayer;
}
// If we found a layer, return. Child layers, and foreground always render in front of background.
if (candidateLayer)
return candidateLayer;
if (isSelfPaintingLayer()) {
HitTestResult tempResult(result.hitTestLocation());
bool insideFragmentBackgroundRect = false;
if (hitTestContentsForFragments(layerFragments, request, tempResult, hitTestLocation, HitTestSelf, insideFragmentBackgroundRect)
&& isHitCandidate(this, false, zOffsetForContentsPtr, unflattenedTransformState.get())) {
if (result.isRectBasedTest())
result.append(tempResult);
else
result = tempResult;
return this;
}
if (insideFragmentBackgroundRect && result.isRectBasedTest())
result.append(tempResult);
}
return 0;
}
bool RenderLayer::hitTestContentsForFragments(const LayerFragments& layerFragments, const HitTestRequest& request, HitTestResult& result,
const HitTestLocation& hitTestLocation, HitTestFilter hitTestFilter, bool& insideClipRect) const
{
if (layerFragments.isEmpty())
return false;
for (int i = layerFragments.size() - 1; i >= 0; --i) {
const LayerFragment& fragment = layerFragments.at(i);
if ((hitTestFilter == HitTestSelf && !fragment.backgroundRect.intersects(hitTestLocation))
|| (hitTestFilter == HitTestDescendants && !fragment.foregroundRect.intersects(hitTestLocation)))
continue;
insideClipRect = true;
if (hitTestContents(request, result, fragment.layerBounds, hitTestLocation, hitTestFilter))
return true;
}
return false;
}
RenderLayer* RenderLayer::hitTestTransformedLayerInFragments(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation, const HitTestingTransformState* transformState, double* zOffset)
{
LayerFragments enclosingPaginationFragments;
LayoutPoint offsetOfPaginationLayerFromRoot;
// FIXME: We're missing a sub-pixel offset here crbug.com/348728
LayoutRect transformedExtent = transparencyClipBox(this, enclosingPaginationLayer(), HitTestingTransparencyClipBox, RenderLayer::RootOfTransparencyClipBox, LayoutSize());
enclosingPaginationLayer()->collectFragments(enclosingPaginationFragments, rootLayer, hitTestRect,
RootRelativeClipRects, IncludeOverlayScrollbarSize, RespectOverflowClip, &offsetOfPaginationLayerFromRoot, LayoutSize(), &transformedExtent);
for (int i = enclosingPaginationFragments.size() - 1; i >= 0; --i) {
const LayerFragment& fragment = enclosingPaginationFragments.at(i);
// Apply the page/column clip for this fragment, as well as any clips established by layers in between us and
// the enclosing pagination layer.
LayoutRect clipRect = fragment.backgroundRect.rect();
// Now compute the clips within a given fragment
if (parent() != enclosingPaginationLayer()) {
enclosingPaginationLayer()->convertToLayerCoords(rootLayer, offsetOfPaginationLayerFromRoot);
LayoutRect parentClipRect = clipper().backgroundClipRect(ClipRectsContext(enclosingPaginationLayer(), RootRelativeClipRects, IncludeOverlayScrollbarSize)).rect();
parentClipRect.moveBy(fragment.paginationOffset + offsetOfPaginationLayerFromRoot);
clipRect.intersect(parentClipRect);
}
if (!hitTestLocation.intersects(clipRect))
continue;
RenderLayer* hitLayer = hitTestLayerByApplyingTransform(rootLayer, containerLayer, request, result, hitTestRect, hitTestLocation,
transformState, zOffset, fragment.paginationOffset);
if (hitLayer)
return hitLayer;
}
return 0;
}
RenderLayer* RenderLayer::hitTestLayerByApplyingTransform(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation, const HitTestingTransformState* transformState, double* zOffset,
const LayoutPoint& translationOffset)
{
// Create a transform state to accumulate this transform.
RefPtr<HitTestingTransformState> newTransformState = createLocalTransformState(rootLayer, containerLayer, hitTestRect, hitTestLocation, transformState, translationOffset);
// If the transform can't be inverted, then don't hit test this layer at all.
if (!newTransformState->m_accumulatedTransform.isInvertible())
return 0;
// Compute the point and the hit test rect in the coords of this layer by using the values
// from the transformState, which store the point and quad in the coords of the last flattened
// layer, and the accumulated transform which lets up map through preserve-3d layers.
//
// We can't just map hitTestLocation and hitTestRect because they may have been flattened (losing z)
// by our container.
FloatPoint localPoint = newTransformState->mappedPoint();
FloatQuad localPointQuad = newTransformState->mappedQuad();
LayoutRect localHitTestRect = newTransformState->boundsOfMappedArea();
HitTestLocation newHitTestLocation;
if (hitTestLocation.isRectBasedTest())
newHitTestLocation = HitTestLocation(localPoint, localPointQuad);
else
newHitTestLocation = HitTestLocation(localPoint);
// Now do a hit test with the root layer shifted to be us.
return hitTestLayer(this, containerLayer, request, result, localHitTestRect, newHitTestLocation, true, newTransformState.get(), zOffset);
}
bool RenderLayer::hitTestContents(const HitTestRequest& request, HitTestResult& result, const LayoutRect& layerBounds, const HitTestLocation& hitTestLocation, HitTestFilter hitTestFilter) const
{
ASSERT(isSelfPaintingLayer() || hasSelfPaintingLayerDescendant());
if (!renderer()->hitTest(request, result, hitTestLocation, toLayoutPoint(layerBounds.location() - renderBoxLocation()), hitTestFilter)) {
// It's wrong to set innerNode, but then claim that you didn't hit anything, unless it is
// a rect-based test.
ASSERT(!result.innerNode() || (result.isRectBasedTest() && result.rectBasedTestResult().size()));
return false;
}
// For positioned generated content, we might still not have a
// node by the time we get to the layer level, since none of
// the content in the layer has an element. So just walk up
// the tree.
if (!result.innerNode() || !result.innerNonSharedNode()) {
Node* e = enclosingElement();
if (!result.innerNode())
result.setInnerNode(e);
if (!result.innerNonSharedNode())
result.setInnerNonSharedNode(e);
}
return true;
}
RenderLayer* RenderLayer::hitTestChildren(ChildrenIteration childrentoVisit, RenderLayer* rootLayer,
const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation,
const HitTestingTransformState* transformState,
double* zOffsetForDescendants, double* zOffset,
const HitTestingTransformState* unflattenedTransformState,
bool depthSortDescendants)
{
if (!hasSelfPaintingLayerDescendant())
return 0;
RenderLayer* resultLayer = 0;
RenderLayerStackingNodeReverseIterator iterator(*m_stackingNode, childrentoVisit);
while (RenderLayerStackingNode* child = iterator.next()) {
RenderLayer* childLayer = child->layer();
RenderLayer* hitLayer = 0;
HitTestResult tempResult(result.hitTestLocation());
if (childLayer->isPaginated())
hitLayer = hitTestPaginatedChildLayer(childLayer, rootLayer, request, tempResult, hitTestRect, hitTestLocation, transformState, zOffsetForDescendants);
else
hitLayer = childLayer->hitTestLayer(rootLayer, this, request, tempResult, hitTestRect, hitTestLocation, false, transformState, zOffsetForDescendants);
// If it a rect-based test, we can safely append the temporary result since it might had hit
// nodes but not necesserily had hitLayer set.
if (result.isRectBasedTest())
result.append(tempResult);
if (isHitCandidate(hitLayer, depthSortDescendants, zOffset, unflattenedTransformState)) {
resultLayer = hitLayer;
if (!result.isRectBasedTest())
result = tempResult;
if (!depthSortDescendants)
break;
}
}
return resultLayer;
}
RenderLayer* RenderLayer::hitTestPaginatedChildLayer(RenderLayer* childLayer, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation, const HitTestingTransformState* transformState, double* zOffset)
{
Vector<RenderLayer*> columnLayers;
RenderLayerStackingNode* ancestorNode = m_stackingNode->isNormalFlowOnly() ? parent()->stackingNode() : m_stackingNode->ancestorStackingContextNode();
for (RenderLayer* curr = childLayer->parent(); curr; curr = curr->parent()) {
if (curr->renderer()->hasColumns() && checkContainingBlockChainForPagination(childLayer->renderer(), curr->renderBox()))
columnLayers.append(curr);
if (curr->stackingNode() == ancestorNode)
break;
}
ASSERT(columnLayers.size());
return hitTestChildLayerColumns(childLayer, rootLayer, request, result, hitTestRect, hitTestLocation, transformState, zOffset,
columnLayers, columnLayers.size() - 1);
}
RenderLayer* RenderLayer::hitTestChildLayerColumns(RenderLayer* childLayer, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation, const HitTestingTransformState* transformState, double* zOffset,
const Vector<RenderLayer*>& columnLayers, size_t columnIndex)
{
RenderBlock* columnBlock = toRenderBlock(columnLayers[columnIndex]->renderer());
ASSERT(columnBlock && columnBlock->hasColumns());
if (!columnBlock || !columnBlock->hasColumns())
return 0;
LayoutPoint layerOffset;
columnBlock->layer()->convertToLayerCoords(rootLayer, layerOffset);
ColumnInfo* colInfo = columnBlock->columnInfo();
int colCount = columnBlock->columnCount(colInfo);
// We have to go backwards from the last column to the first.
bool isHorizontal = columnBlock->style()->isHorizontalWritingMode();
LayoutUnit logicalLeft = columnBlock->logicalLeftOffsetForContent();
LayoutUnit currLogicalTopOffset = 0;
int i;
for (i = 0; i < colCount; i++) {
LayoutRect colRect = columnBlock->columnRectAt(colInfo, i);
LayoutUnit blockDelta = (isHorizontal ? colRect.height() : colRect.width());
if (columnBlock->style()->slowIsFlippedBlocksWritingMode())
currLogicalTopOffset += blockDelta;
else
currLogicalTopOffset -= blockDelta;
}
for (i = colCount - 1; i >= 0; i--) {
// For each rect, we clip to the rect, and then we adjust our coords.
LayoutRect colRect = columnBlock->columnRectAt(colInfo, i);
columnBlock->flipForWritingMode(colRect);
LayoutUnit currLogicalLeftOffset = (isHorizontal ? colRect.x() : colRect.y()) - logicalLeft;
LayoutUnit blockDelta = (isHorizontal ? colRect.height() : colRect.width());
if (columnBlock->style()->slowIsFlippedBlocksWritingMode())
currLogicalTopOffset -= blockDelta;
else
currLogicalTopOffset += blockDelta;
LayoutSize offset;
if (isHorizontal) {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
offset = LayoutSize(currLogicalLeftOffset, currLogicalTopOffset);
else
offset = LayoutSize(0, colRect.y() + currLogicalTopOffset - columnBlock->borderTop() - columnBlock->paddingTop());
} else {
if (colInfo->progressionAxis() == ColumnInfo::InlineAxis)
offset = LayoutSize(currLogicalTopOffset, currLogicalLeftOffset);
else
offset = LayoutSize(colRect.x() + currLogicalTopOffset - columnBlock->borderLeft() - columnBlock->paddingLeft(), 0);
}
colRect.moveBy(layerOffset);
LayoutRect localClipRect(hitTestRect);
localClipRect.intersect(colRect);
if (!localClipRect.isEmpty() && hitTestLocation.intersects(localClipRect)) {
RenderLayer* hitLayer = 0;
if (!columnIndex) {
// Apply a translation transform to change where the layer paints.
TransformationMatrix oldTransform;
bool oldHasTransform = childLayer->transform();
if (oldHasTransform)
oldTransform = *childLayer->transform();
TransformationMatrix newTransform(oldTransform);
newTransform.translateRight(offset.width(), offset.height());
childLayer->m_transform = adoptPtr(new TransformationMatrix(newTransform));
hitLayer = childLayer->hitTestLayer(rootLayer, columnLayers[0], request, result, localClipRect, hitTestLocation, false, transformState, zOffset);
if (oldHasTransform)
childLayer->m_transform = adoptPtr(new TransformationMatrix(oldTransform));
else
childLayer->m_transform.clear();
} else {
// Adjust the transform such that the renderer's upper left corner will be at (0,0) in user space.
// This involves subtracting out the position of the layer in our current coordinate space.
RenderLayer* nextLayer = columnLayers[columnIndex - 1];
RefPtr<HitTestingTransformState> newTransformState = nextLayer->createLocalTransformState(rootLayer, nextLayer, localClipRect, hitTestLocation, transformState);
newTransformState->translate(offset.width(), offset.height(), HitTestingTransformState::AccumulateTransform);
FloatPoint localPoint = newTransformState->mappedPoint();
FloatQuad localPointQuad = newTransformState->mappedQuad();
LayoutRect localHitTestRect = newTransformState->mappedArea().enclosingBoundingBox();
HitTestLocation newHitTestLocation;
if (hitTestLocation.isRectBasedTest())
newHitTestLocation = HitTestLocation(localPoint, localPointQuad);
else
newHitTestLocation = HitTestLocation(localPoint);
newTransformState->flatten();
hitLayer = hitTestChildLayerColumns(childLayer, columnLayers[columnIndex - 1], request, result, localHitTestRect, newHitTestLocation,
newTransformState.get(), zOffset, columnLayers, columnIndex - 1);
}
if (hitLayer)
return hitLayer;
}
}
return 0;
}
void RenderLayer::blockSelectionGapsBoundsChanged()
{
setNeedsCompositingInputsUpdate();
}
void RenderLayer::addBlockSelectionGapsBounds(const LayoutRect& bounds)
{
m_blockSelectionGapsBounds.unite(enclosingIntRect(bounds));
blockSelectionGapsBoundsChanged();
}
void RenderLayer::clearBlockSelectionGapsBounds()
{
m_blockSelectionGapsBounds = IntRect();
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->clearBlockSelectionGapsBounds();
blockSelectionGapsBoundsChanged();
}
void RenderLayer::invalidatePaintForBlockSelectionGaps()
{
for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
child->invalidatePaintForBlockSelectionGaps();
if (m_blockSelectionGapsBounds.isEmpty())
return;
LayoutRect rect = m_blockSelectionGapsBounds;
if (renderer()->hasOverflowClip()) {
RenderBox* box = renderBox();
rect.move(-box->scrolledContentOffset());
if (!scrollableArea()->usesCompositedScrolling())
rect.intersect(box->overflowClipRect(LayoutPoint()));
}
if (renderer()->hasClip())
rect.intersect(toRenderBox(renderer())->clipRect(LayoutPoint()));
if (!rect.isEmpty())
renderer()->invalidatePaintRectangle(rect);
}
IntRect RenderLayer::blockSelectionGapsBounds() const
{
if (!renderer()->isRenderBlock())
return IntRect();
RenderBlock* renderBlock = toRenderBlock(renderer());
LayoutRect gapRects = renderBlock->selectionGapRectsForPaintInvalidation(renderBlock);
return pixelSnappedIntRect(gapRects);
}
bool RenderLayer::hasBlockSelectionGapBounds() const
{
// FIXME: it would be more accurate to return !blockSelectionGapsBounds().isEmpty(), but this is impossible
// at the moment because it causes invalid queries to layout-dependent code (crbug.com/372802).
// ASSERT(renderer()->document().lifecycle().state() >= DocumentLifecycle::LayoutClean);
if (!renderer()->isRenderBlock())
return false;
return toRenderBlock(renderer())->shouldPaintSelectionGaps();
}
bool RenderLayer::intersectsDamageRect(const LayoutRect& layerBounds, const LayoutRect& damageRect, const RenderLayer* rootLayer, const LayoutPoint* offsetFromRoot) const
{
// Always examine the canvas and the root.
// FIXME: Could eliminate the isDocumentElement() check if we fix background painting so that the RenderView
// paints the root's background.
if (isRootLayer() || renderer()->isDocumentElement())
return true;
// If we aren't an inline flow, and our layer bounds do intersect the damage rect, then we
// can go ahead and return true.
RenderView* view = renderer()->view();
ASSERT(view);
if (view && !renderer()->isRenderInline()) {
if (layerBounds.intersects(damageRect))
return true;
}
// Otherwise we need to compute the bounding box of this single layer and see if it intersects
// the damage rect.
return physicalBoundingBox(rootLayer, offsetFromRoot).intersects(damageRect);
}
LayoutRect RenderLayer::logicalBoundingBox() const
{
// There are three special cases we need to consider.
// (1) Inline Flows. For inline flows we will create a bounding box that fully encompasses all of the lines occupied by the
// inline. In other words, if some <span> wraps to three lines, we'll create a bounding box that fully encloses the
// line boxes of all three lines (including overflow on those lines).
// (2) Left/Top Overflow. The width/height of layers already includes right/bottom overflow. However, in the case of left/top
// overflow, we have to create a bounding box that will extend to include this overflow.
// (3) Floats. When a layer has overhanging floats that it paints, we need to make sure to include these overhanging floats
// as part of our bounding box. We do this because we are the responsible layer for both hit testing and painting those
// floats.
LayoutRect result;
if (renderer()->isInline() && renderer()->isRenderInline()) {
result = toRenderInline(renderer())->linesVisualOverflowBoundingBox();
} else if (renderer()->isTableRow()) {
// Our bounding box is just the union of all of our cells' border/overflow rects.
for (RenderObject* child = renderer()->slowFirstChild(); child; child = child->nextSibling()) {
if (child->isTableCell()) {
LayoutRect bbox = toRenderBox(child)->borderBoxRect();
result.unite(bbox);
LayoutRect overflowRect = renderBox()->visualOverflowRect();
if (bbox != overflowRect)
result.unite(overflowRect);
}
}
} else {
RenderBox* box = renderBox();
ASSERT(box);
result = box->borderBoxRect();
result.unite(box->visualOverflowRect());
}
ASSERT(renderer()->view());
return result;
}
static inline LayoutRect flippedLogicalBoundingBox(LayoutRect boundingBox, RenderObject* renderer)
{
if (!UNLIKELY(renderer->document().containsAnyRareWritingMode()))
return boundingBox;
LayoutRect result = boundingBox;
if (renderer->isBox())
toRenderBox(renderer)->flipForWritingMode(result);
else
renderer->containingBlock()->flipForWritingMode(result);
return result;
}
LayoutRect RenderLayer::physicalBoundingBox(const RenderLayer* ancestorLayer, const LayoutPoint* offsetFromRoot) const
{
LayoutRect result = flippedLogicalBoundingBox(logicalBoundingBox(), renderer());
if (offsetFromRoot)
result.moveBy(*offsetFromRoot);
else
convertToLayerCoords(ancestorLayer, result);
return result;
}
LayoutRect RenderLayer::fragmentsBoundingBox(const RenderLayer* ancestorLayer) const
{
if (!enclosingPaginationLayer())
return physicalBoundingBox(ancestorLayer);
LayoutRect result = flippedLogicalBoundingBox(logicalBoundingBox(), renderer());
convertFromFlowThreadToVisualBoundingBoxInAncestor(this, ancestorLayer, result);
return result;
}
LayoutRect RenderLayer::boundingBoxForCompositingOverlapTest() const
{
return overlapBoundsIncludeChildren() ? boundingBoxForCompositing() : fragmentsBoundingBox(this);
}
static void expandRectForReflectionAndStackingChildren(const RenderLayer* ancestorLayer, RenderLayer::CalculateBoundsOptions options, LayoutRect& result)
{
if (ancestorLayer->reflectionInfo() && !ancestorLayer->reflectionInfo()->reflectionLayer()->hasCompositedLayerMapping())
result.unite(ancestorLayer->reflectionInfo()->reflectionLayer()->boundingBoxForCompositing(ancestorLayer));
ASSERT(ancestorLayer->stackingNode()->isStackingContext() || !ancestorLayer->stackingNode()->hasPositiveZOrderList());
#if ENABLE(ASSERT)
LayerListMutationDetector mutationChecker(const_cast<RenderLayer*>(ancestorLayer)->stackingNode());
#endif
RenderLayerStackingNodeIterator iterator(*ancestorLayer->stackingNode(), AllChildren);
while (RenderLayerStackingNode* node = iterator.next()) {
// Here we exclude both directly composited layers and squashing layers
// because those RenderLayers don't paint into the graphics layer
// for this RenderLayer. For example, the bounds of squashed RenderLayers
// will be included in the computation of the appropriate squashing
// GraphicsLayer.
if (options != RenderLayer::ApplyBoundsChickenEggHacks && node->layer()->compositingState() != NotComposited)
continue;
result.unite(node->layer()->boundingBoxForCompositing(ancestorLayer, options));
}
}
LayoutRect RenderLayer::physicalBoundingBoxIncludingReflectionAndStackingChildren(const RenderLayer* ancestorLayer, const LayoutPoint& offsetFromRoot) const
{
LayoutPoint origin;
LayoutRect result = physicalBoundingBox(ancestorLayer, &origin);
const_cast<RenderLayer*>(this)->stackingNode()->updateLayerListsIfNeeded();
expandRectForReflectionAndStackingChildren(this, DoNotApplyBoundsChickenEggHacks, result);
result.moveBy(offsetFromRoot);
return result;
}
LayoutRect RenderLayer::boundingBoxForCompositing(const RenderLayer* ancestorLayer, CalculateBoundsOptions options) const
{
if (!isSelfPaintingLayer())
return LayoutRect();
if (!ancestorLayer)
ancestorLayer = this;
// FIXME: This could be improved to do a check like hasVisibleNonCompositingDescendantLayers() (bug 92580).
if (this != ancestorLayer && !hasVisibleContent() && !hasVisibleDescendant())
return LayoutRect();
// The root layer is always just the size of the document.
if (isRootLayer())
return m_renderer->view()->unscaledDocumentRect();
// The layer created for the RenderFlowThread is just a helper for painting and hit-testing,
// and should not contribute to the bounding box. The RenderMultiColumnSets will contribute
// the correct size for the rendered content of the multicol container.
if (useRegionBasedColumns() && renderer()->isRenderFlowThread())
return LayoutRect();
LayoutRect result = clipper().localClipRect();
if (result == PaintInfo::infiniteRect()) {
LayoutPoint origin;
result = physicalBoundingBox(ancestorLayer, &origin);
const_cast<RenderLayer*>(this)->stackingNode()->updateLayerListsIfNeeded();
// Reflections are implemented with RenderLayers that hang off of the reflected layer. However,
// the reflection layer subtree does not include the subtree of the parent RenderLayer, so
// a recursive computation of stacking children yields no results. This breaks cases when there are stacking
// children of the parent, that need to be included in reflected composited bounds.
// Fix this by including composited bounds of stacking children of the reflected RenderLayer.
if (hasCompositedLayerMapping() && parent() && parent()->reflectionInfo() && parent()->reflectionInfo()->reflectionLayer() == this)
expandRectForReflectionAndStackingChildren(parent(), options, result);
else
expandRectForReflectionAndStackingChildren(this, options, result);
// FIXME: We can optimize the size of the composited layers, by not enlarging
// filtered areas with the outsets if we know that the filter is going to render in hardware.
// https://bugs.webkit.org/show_bug.cgi?id=81239
m_renderer->style()->filterOutsets().expandRect(result);
}
if (paintsWithTransform(PaintBehaviorNormal) || (options == ApplyBoundsChickenEggHacks && transform()))
result = transform()->mapRect(result);
if (enclosingPaginationLayer()) {
convertFromFlowThreadToVisualBoundingBoxInAncestor(this, ancestorLayer, result);
return result;
}
LayoutPoint delta;
convertToLayerCoords(ancestorLayer, delta);
result.moveBy(delta);
return result;
}
CompositingState RenderLayer::compositingState() const
{
ASSERT(isAllowedToQueryCompositingState());
// This is computed procedurally so there is no redundant state variable that
// can get out of sync from the real actual compositing state.
if (m_groupedMapping) {
ASSERT(compositor()->layerSquashingEnabled());
ASSERT(!m_compositedLayerMapping);
return PaintsIntoGroupedBacking;
}
if (!m_compositedLayerMapping)
return NotComposited;
return PaintsIntoOwnBacking;
}
bool RenderLayer::isAllowedToQueryCompositingState() const
{
if (gCompositingQueryMode == CompositingQueriesAreAllowed)
return true;
return renderer()->document().lifecycle().state() >= DocumentLifecycle::InCompositingUpdate;
}
CompositedLayerMapping* RenderLayer::compositedLayerMapping() const
{
ASSERT(isAllowedToQueryCompositingState());
return m_compositedLayerMapping.get();
}
GraphicsLayer* RenderLayer::graphicsLayerBacking() const
{
switch (compositingState()) {
case NotComposited:
return 0;
case PaintsIntoGroupedBacking:
return groupedMapping()->squashingLayer();
default:
return compositedLayerMapping()->mainGraphicsLayer();
}
}
GraphicsLayer* RenderLayer::graphicsLayerBackingForScrolling() const
{
switch (compositingState()) {
case NotComposited:
return 0;
case PaintsIntoGroupedBacking:
return groupedMapping()->squashingLayer();
default:
return compositedLayerMapping()->scrollingContentsLayer() ? compositedLayerMapping()->scrollingContentsLayer() : compositedLayerMapping()->mainGraphicsLayer();
}
}
CompositedLayerMapping* RenderLayer::ensureCompositedLayerMapping()
{
if (!m_compositedLayerMapping) {
m_compositedLayerMapping = adoptPtr(new CompositedLayerMapping(*this));
m_compositedLayerMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
updateOrRemoveFilterEffectRenderer();
}
return m_compositedLayerMapping.get();
}
void RenderLayer::clearCompositedLayerMapping(bool layerBeingDestroyed)
{
if (!layerBeingDestroyed) {
// We need to make sure our decendants get a geometry update. In principle,
// we could call setNeedsGraphicsLayerUpdate on our children, but that would
// require walking the z-order lists to find them. Instead, we over-invalidate
// by marking our parent as needing a geometry update.
if (RenderLayer* compositingParent = enclosingLayerWithCompositedLayerMapping(ExcludeSelf))
compositingParent->compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
}
m_compositedLayerMapping.clear();
if (!layerBeingDestroyed)
updateOrRemoveFilterEffectRenderer();
}
void RenderLayer::setGroupedMapping(CompositedLayerMapping* groupedMapping, bool layerBeingDestroyed)
{
if (groupedMapping == m_groupedMapping)
return;
if (!layerBeingDestroyed && m_groupedMapping) {
m_groupedMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
m_groupedMapping->removeRenderLayerFromSquashingGraphicsLayer(this);
}
m_groupedMapping = groupedMapping;
if (!layerBeingDestroyed && m_groupedMapping)
m_groupedMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
}
bool RenderLayer::hasCompositedMask() const
{
return m_compositedLayerMapping && m_compositedLayerMapping->hasMaskLayer();
}
bool RenderLayer::hasCompositedClippingMask() const
{
return m_compositedLayerMapping && m_compositedLayerMapping->hasChildClippingMaskLayer();
}
bool RenderLayer::paintsWithTransform(PaintBehavior paintBehavior) const
{
return transform() && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || compositingState() != PaintsIntoOwnBacking);
}
bool RenderLayer::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
{
if (!isSelfPaintingLayer() && !hasSelfPaintingLayerDescendant())
return false;
if (paintsWithTransparency(PaintBehaviorNormal))
return false;
// We can't use hasVisibleContent(), because that will be true if our renderer is hidden, but some child
// is visible and that child doesn't cover the entire rect.
if (renderer()->style()->visibility() != VISIBLE)
return false;
if (paintsWithFilters() && renderer()->style()->filter().hasFilterThatAffectsOpacity())
return false;
// FIXME: Handle simple transforms.
if (paintsWithTransform(PaintBehaviorNormal))
return false;
// FIXME: Remove this check.
// This function should not be called when layer-lists are dirty.
// It is somehow getting triggered during style update.
if (m_stackingNode->zOrderListsDirty() || m_stackingNode->normalFlowListDirty())
return false;
// FIXME: We currently only check the immediate renderer,
// which will miss many cases.
if (renderer()->backgroundIsKnownToBeOpaqueInRect(localRect))
return true;
// We can't consult child layers if we clip, since they might cover
// parts of the rect that are clipped out.
if (renderer()->hasOverflowClip())
return false;
return childBackgroundIsKnownToBeOpaqueInRect(localRect);
}
bool RenderLayer::childBackgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
{
RenderLayerStackingNodeReverseIterator revertseIterator(*m_stackingNode, PositiveZOrderChildren | NormalFlowChildren | NegativeZOrderChildren);
while (RenderLayerStackingNode* child = revertseIterator.next()) {
const RenderLayer* childLayer = child->layer();
// Stop at composited paint boundaries.
if (childLayer->isPaintInvalidationContainer())
continue;
if (!childLayer->canUseConvertToLayerCoords())
continue;
LayoutPoint childOffset;
LayoutRect childLocalRect(localRect);
childLayer->convertToLayerCoords(this, childOffset);
childLocalRect.moveBy(-childOffset);
if (childLayer->backgroundIsKnownToBeOpaqueInRect(childLocalRect))
return true;
}
return false;
}
bool RenderLayer::shouldBeSelfPaintingLayer() const
{
if (renderer()->isRenderPart() && toRenderPart(renderer())->requiresAcceleratedCompositing())
return true;
return m_layerType == NormalLayer
|| (m_scrollableArea && m_scrollableArea->hasOverlayScrollbars())
|| needsCompositedScrolling();
}
void RenderLayer::updateSelfPaintingLayer()
{
bool isSelfPaintingLayer = shouldBeSelfPaintingLayer();
if (this->isSelfPaintingLayer() == isSelfPaintingLayer)
return;
m_isSelfPaintingLayer = isSelfPaintingLayer;
if (parent())
parent()->dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
}
bool RenderLayer::hasNonEmptyChildRenderers() const
{
// Some HTML can cause whitespace text nodes to have renderers, like:
// <div>
// <img src=...>
// </div>
// so test for 0x0 RenderTexts here
for (RenderObject* child = renderer()->slowFirstChild(); child; child = child->nextSibling()) {
if (!child->hasLayer()) {
if (child->isRenderInline() || !child->isBox())
return true;
if (toRenderBox(child)->width() > 0 || toRenderBox(child)->height() > 0)
return true;