/
RenderLayerCompositor.cpp
5198 lines (4194 loc) · 214 KB
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RenderLayerCompositor.cpp
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/*
* Copyright (C) 2009-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RenderLayerCompositor.h"
#include "AsyncScrollingCoordinator.h"
#include "CSSPropertyNames.h"
#include "CanvasRenderingContext.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Frame.h"
#include "FrameView.h"
#include "FullscreenManager.h"
#include "GraphicsLayer.h"
#include "HTMLCanvasElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLNames.h"
#include "HitTestResult.h"
#include "InspectorInstrumentation.h"
#include "KeyframeEffectStack.h"
#include "LayerAncestorClippingStack.h"
#include "LayerOverlapMap.h"
#include "Logging.h"
#include "NodeList.h"
#include "Page.h"
#include "PageOverlayController.h"
#include "RenderEmbeddedObject.h"
#include "RenderFragmentedFlow.h"
#include "RenderFullScreen.h"
#include "RenderGeometryMap.h"
#include "RenderIFrame.h"
#include "RenderImage.h"
#include "RenderLayerBacking.h"
#include "RenderLayerScrollableArea.h"
#include "RenderVideo.h"
#include "RenderView.h"
#include "RuntimeEnabledFeatures.h"
#include "ScrollingConstraints.h"
#include "Settings.h"
#include "TiledBacking.h"
#include "TransformState.h"
#include <wtf/HexNumber.h>
#include <wtf/MemoryPressureHandler.h>
#include <wtf/SetForScope.h>
#include <wtf/SystemTracing.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringConcatenateNumbers.h>
#include <wtf/text/TextStream.h>
#if PLATFORM(IOS_FAMILY)
#include "LegacyTileCache.h"
#include "RenderScrollbar.h"
#endif
#if PLATFORM(MAC)
#include "LocalDefaultSystemAppearance.h"
#endif
#if ENABLE(TREE_DEBUGGING)
#include "RenderTreeAsText.h"
#endif
#if ENABLE(3D_TRANSFORMS)
// This symbol is used to determine from a script whether 3D rendering is enabled (via 'nm').
WEBCORE_EXPORT bool WebCoreHas3DRendering = true;
#endif
#if !PLATFORM(MAC) && !PLATFORM(IOS_FAMILY)
#define USE_COMPOSITING_FOR_SMALL_CANVASES 1
#endif
namespace WebCore {
#if !USE(COMPOSITING_FOR_SMALL_CANVASES)
static const int canvasAreaThresholdRequiringCompositing = 50 * 100;
#endif
using namespace HTMLNames;
struct ScrollingTreeState {
std::optional<ScrollingNodeID> parentNodeID;
size_t nextChildIndex { 0 };
bool needSynchronousScrollingReasonsUpdate { false };
};
struct RenderLayerCompositor::OverlapExtent {
LayoutRect bounds;
bool extentComputed { false };
bool hasTransformAnimation { false };
bool animationCausesExtentUncertainty { false };
bool knownToBeHaveExtentUncertainty() const { return extentComputed && animationCausesExtentUncertainty; }
};
struct RenderLayerCompositor::CompositingState {
CompositingState(RenderLayer* compAncestor, bool testOverlap = true)
: compositingAncestor(compAncestor)
, testingOverlap(testOverlap)
{
}
CompositingState stateForPaintOrderChildren(RenderLayer& layer) const
{
UNUSED_PARAM(layer);
CompositingState childState(compositingAncestor);
if (layer.isStackingContext())
childState.stackingContextAncestor = &layer;
else
childState.stackingContextAncestor = stackingContextAncestor;
childState.backingSharingAncestor = backingSharingAncestor;
childState.subtreeIsCompositing = false;
childState.testingOverlap = testingOverlap;
childState.fullPaintOrderTraversalRequired = fullPaintOrderTraversalRequired;
childState.descendantsRequireCompositingUpdate = descendantsRequireCompositingUpdate;
childState.ancestorHasTransformAnimation = ancestorHasTransformAnimation;
childState.hasCompositedNonContainedDescendants = false;
#if ENABLE(CSS_COMPOSITING)
childState.hasNotIsolatedCompositedBlendingDescendants = false; // FIXME: should this only be reset for stacking contexts?
#endif
#if !LOG_DISABLED
childState.depth = depth + 1;
#endif
return childState;
}
void updateWithDescendantStateAndLayer(const CompositingState& childState, const RenderLayer& layer, const RenderLayer* ancestorLayer, const OverlapExtent& layerExtent, bool isUnchangedSubtree = false)
{
// Subsequent layers in the parent stacking context also need to composite.
subtreeIsCompositing |= childState.subtreeIsCompositing | layer.isComposited();
if (!isUnchangedSubtree)
fullPaintOrderTraversalRequired |= childState.fullPaintOrderTraversalRequired;
// Turn overlap testing off for later layers if it's already off, or if we have an animating transform.
// Note that if the layer clips its descendants, there's no reason to propagate the child animation to the parent layers. That's because
// we know for sure the animation is contained inside the clipping rectangle, which is already added to the overlap map.
auto canReenableOverlapTesting = [&layer] {
return layer.isComposited() && RenderLayerCompositor::clipsCompositingDescendants(layer);
};
if ((!childState.testingOverlap && !canReenableOverlapTesting()) || layerExtent.knownToBeHaveExtentUncertainty())
testingOverlap = false;
auto computeHasCompositedNonContainedDescendants = [&] {
if (hasCompositedNonContainedDescendants)
return true;
if (!ancestorLayer)
return false;
if (!layer.isComposited())
return false;
if (!layer.renderer().isOutOfFlowPositioned())
return false;
if (layer.ancestorLayerIsInContainingBlockChain(*ancestorLayer))
return false;
return true;
};
hasCompositedNonContainedDescendants = computeHasCompositedNonContainedDescendants();
#if ENABLE(CSS_COMPOSITING)
if ((layer.isComposited() && layer.hasBlendMode()) || (layer.hasNotIsolatedCompositedBlendingDescendants() && !layer.isolatesCompositedBlending()))
hasNotIsolatedCompositedBlendingDescendants = true;
#endif
}
bool hasNonRootCompositedAncestor() const
{
return compositingAncestor && !compositingAncestor->isRenderViewLayer();
}
RenderLayer* compositingAncestor;
RenderLayer* backingSharingAncestor { nullptr };
RenderLayer* stackingContextAncestor { nullptr };
bool subtreeIsCompositing { false };
bool testingOverlap { true };
bool fullPaintOrderTraversalRequired { false };
bool descendantsRequireCompositingUpdate { false };
bool ancestorHasTransformAnimation { false };
bool hasCompositedNonContainedDescendants { false };
#if ENABLE(CSS_COMPOSITING)
bool hasNotIsolatedCompositedBlendingDescendants { false };
#endif
#if !LOG_DISABLED
unsigned depth { 0 };
#endif
};
struct RenderLayerCompositor::UpdateBackingTraversalState {
UpdateBackingTraversalState(RenderLayer* compAncestor = nullptr, Vector<RenderLayer*>* clippedLayers = nullptr, Vector<RenderLayer*>* overflowScrollers = nullptr)
: compositingAncestor(compAncestor)
, layersClippedByScrollers(clippedLayers)
, overflowScrollLayers(overflowScrollers)
{
}
UpdateBackingTraversalState stateForDescendants() const
{
UpdateBackingTraversalState state(compositingAncestor, layersClippedByScrollers, overflowScrollLayers);
#if !LOG_DISABLED
state.depth = depth + 1;
#endif
return state;
}
RenderLayer* compositingAncestor;
// List of layers in the current stacking context that are clipped by ancestor scrollers.
Vector<RenderLayer*>* layersClippedByScrollers;
// List of layers with composited overflow:scroll.
Vector<RenderLayer*>* overflowScrollLayers;
#if !LOG_DISABLED
unsigned depth { 0 };
#endif
};
class RenderLayerCompositor::BackingSharingState {
WTF_MAKE_NONCOPYABLE(BackingSharingState);
public:
BackingSharingState() = default;
RenderLayer* backingProviderCandidate() const { return m_backingProviderCandidate; };
void appendSharingLayer(RenderLayer& layer)
{
ASSERT(m_backingProviderCandidate);
m_backingSharingLayers.append(layer);
}
RenderLayer* updateBeforeDescendantTraversal(RenderLayer&, bool willBeComposited);
void updateAfterDescendantTraversal(RenderLayer&, RenderLayer* preDescendantProviderCandidate, RenderLayer* stackingContextAncestor);
bool isPotentialBackingSharingLayer(const RenderLayer& layer) const
{
return m_backingSharingLayers.contains(&layer);
}
bool canIncludeLayer(const RenderLayer&) const;
// Add a layer that would repaint into a layer in m_backingSharingLayers.
// That repaint has to wait until we've set the provider's backing-sharing layers.
void addLayerNeedingRepaint(RenderLayer& layer)
{
m_layersPendingRepaint.add(layer);
}
private:
void layerWillBeComposited(RenderLayer&);
void startBackingSharingSequence(RenderLayer& candidateLayer, RenderLayer* candidateStackingContext);
void endBackingSharingSequence();
void issuePendingRepaints();
RenderLayer* m_backingProviderCandidate { nullptr };
RenderLayer* m_backingProviderStackingContext { nullptr };
Vector<WeakPtr<RenderLayer>> m_backingSharingLayers;
WeakHashSet<RenderLayer> m_layersPendingRepaint;
};
void RenderLayerCompositor::BackingSharingState::startBackingSharingSequence(RenderLayer& candidateLayer, RenderLayer* candidateStackingContext)
{
ASSERT(!m_backingProviderCandidate);
ASSERT(m_backingSharingLayers.isEmpty());
m_backingProviderCandidate = &candidateLayer;
m_backingProviderStackingContext = candidateStackingContext;
}
void RenderLayerCompositor::BackingSharingState::endBackingSharingSequence()
{
if (!m_backingProviderCandidate)
return;
m_backingProviderCandidate->backing()->setBackingSharingLayers(WTFMove(m_backingSharingLayers));
m_backingSharingLayers.clear();
issuePendingRepaints();
m_backingProviderCandidate = nullptr;
}
bool RenderLayerCompositor::BackingSharingState::canIncludeLayer(const RenderLayer& layer) const
{
// Disable sharing when painting shared layers doesn't work correctly.
if (layer.hasReflection())
return false;
return m_backingProviderCandidate && layer.ancestorLayerIsInContainingBlockChain(*m_backingProviderCandidate);
}
RenderLayer* RenderLayerCompositor::BackingSharingState::updateBeforeDescendantTraversal(RenderLayer& layer, bool willBeComposited)
{
layer.setBackingProviderLayer(nullptr);
LOG_WITH_STREAM(Compositing, stream << "BackingSharingState::updateBeforeDescendantTraversal: layer " << &layer << " will be composited " << willBeComposited);
// A layer that composites resets backing-sharing, since subsequent layers need to composite to overlap it.
if (willBeComposited) {
LOG_WITH_STREAM(Compositing, stream << " ending sharing sequence on " << m_backingProviderCandidate);
m_backingSharingLayers.removeAll(&layer);
endBackingSharingSequence();
}
return m_backingProviderCandidate;
}
void RenderLayerCompositor::BackingSharingState::updateAfterDescendantTraversal(RenderLayer& layer, RenderLayer* preDescendantProviderCandidate, RenderLayer* stackingContextAncestor)
{
LOG_WITH_STREAM(Compositing, stream << "BackingSharingState::updateAfterDescendantTraversal for layer " << &layer << " is composited " << layer.isComposited());
if (layer.isComposited()) {
// If this layer is being composited, clean up sharing-related state.
layer.disconnectFromBackingProviderLayer();
m_backingSharingLayers.removeAll(&layer);
}
// Backing sharing is constrained to layers in the same stacking context.
if (&layer == m_backingProviderStackingContext) {
ASSERT(&layer != m_backingProviderCandidate);
LOG_WITH_STREAM(Compositing, stream << "BackingSharingState::updateAfterDescendantTraversal: End of stacking context for backing provider " << m_backingProviderCandidate << ", ending sharing sequence with " << m_backingSharingLayers.size() << " sharing layers");
endBackingSharingSequence();
if (layer.isComposited())
layer.backing()->clearBackingSharingLayers();
return;
}
if (!layer.isComposited())
return;
if (!m_backingProviderCandidate) {
LOG_WITH_STREAM(Compositing, stream << "BackingSharingState::updateAfterDescendantTraversal: starting potential sharing sequence for " << &layer);
startBackingSharingSequence(layer, stackingContextAncestor);
} else {
ASSERT(&layer != m_backingProviderCandidate);
layer.backing()->clearBackingSharingLayers();
LOG_WITH_STREAM(Compositing, stream << "BackingSharingState::updateAfterDescendantTraversal: " << &layer << " is composited; maybe ending existing backing sequence with candidate " << m_backingProviderCandidate << " context " << m_backingProviderStackingContext << " with " << m_backingSharingLayers.size() << " sharing layers");
if (m_backingProviderCandidate && preDescendantProviderCandidate == m_backingProviderCandidate) {
m_backingSharingLayers.removeAll(&layer);
endBackingSharingSequence();
}
}
}
void RenderLayerCompositor::BackingSharingState::issuePendingRepaints()
{
for (auto& layer : m_layersPendingRepaint) {
LOG_WITH_STREAM(Compositing, stream << "Issuing postponed repaint of layer " << &layer);
layer.computeRepaintRectsIncludingDescendants();
layer.compositor().repaintOnCompositingChange(layer);
}
m_layersPendingRepaint.clear();
}
#if !LOG_DISABLED || ENABLE(TREE_DEBUGGING)
static inline bool compositingLogEnabled()
{
return LogCompositing.state == WTFLogChannelState::On;
}
static inline bool layersLogEnabled()
{
return LogLayers.state == WTFLogChannelState::On;
}
#endif
RenderLayerCompositor::RenderLayerCompositor(RenderView& renderView)
: m_renderView(renderView)
, m_updateCompositingLayersTimer(*this, &RenderLayerCompositor::updateCompositingLayersTimerFired)
{
#if PLATFORM(IOS_FAMILY)
if (m_renderView.frameView().platformWidget())
m_legacyScrollingLayerCoordinator = makeUnique<LegacyWebKitScrollingLayerCoordinator>(page().chrome().client(), isMainFrameCompositor());
#endif
}
RenderLayerCompositor::~RenderLayerCompositor()
{
// Take care that the owned GraphicsLayers are deleted first as their destructors may call back here.
GraphicsLayer::unparentAndClear(m_rootContentsLayer);
GraphicsLayer::unparentAndClear(m_clipLayer);
GraphicsLayer::unparentAndClear(m_scrollContainerLayer);
GraphicsLayer::unparentAndClear(m_scrolledContentsLayer);
GraphicsLayer::unparentAndClear(m_overflowControlsHostLayer);
GraphicsLayer::unparentAndClear(m_layerForHorizontalScrollbar);
GraphicsLayer::unparentAndClear(m_layerForVerticalScrollbar);
GraphicsLayer::unparentAndClear(m_layerForScrollCorner);
#if HAVE(RUBBER_BANDING)
GraphicsLayer::unparentAndClear(m_layerForOverhangAreas);
GraphicsLayer::unparentAndClear(m_contentShadowLayer);
GraphicsLayer::unparentAndClear(m_layerForTopOverhangArea);
GraphicsLayer::unparentAndClear(m_layerForBottomOverhangArea);
GraphicsLayer::unparentAndClear(m_layerForHeader);
GraphicsLayer::unparentAndClear(m_layerForFooter);
#endif
ASSERT(m_rootLayerAttachment == RootLayerUnattached);
}
void RenderLayerCompositor::enableCompositingMode(bool enable /* = true */)
{
if (enable != m_compositing) {
m_compositing = enable;
if (m_compositing) {
ensureRootLayer();
notifyIFramesOfCompositingChange();
} else
destroyRootLayer();
m_renderView.layer()->setNeedsPostLayoutCompositingUpdate();
}
}
void RenderLayerCompositor::cacheAcceleratedCompositingFlags()
{
auto& settings = m_renderView.settings();
bool hasAcceleratedCompositing = settings.acceleratedCompositingEnabled();
// We allow the chrome to override the settings, in case the page is rendered
// on a chrome that doesn't allow accelerated compositing.
if (hasAcceleratedCompositing) {
m_compositingTriggers = page().chrome().client().allowedCompositingTriggers();
hasAcceleratedCompositing = m_compositingTriggers;
}
bool showDebugBorders = settings.showDebugBorders();
bool showRepaintCounter = settings.showRepaintCounter();
bool acceleratedDrawingEnabled = settings.acceleratedDrawingEnabled();
bool displayListDrawingEnabled = settings.displayListDrawingEnabled();
// forceCompositingMode for subframes can only be computed after layout.
bool forceCompositingMode = m_forceCompositingMode;
if (isMainFrameCompositor())
forceCompositingMode = m_renderView.settings().forceCompositingMode() && hasAcceleratedCompositing;
if (hasAcceleratedCompositing != m_hasAcceleratedCompositing || showDebugBorders != m_showDebugBorders || showRepaintCounter != m_showRepaintCounter || forceCompositingMode != m_forceCompositingMode) {
if (auto* rootLayer = m_renderView.layer()) {
rootLayer->setNeedsCompositingConfigurationUpdate();
rootLayer->setDescendantsNeedUpdateBackingAndHierarchyTraversal();
}
}
bool debugBordersChanged = m_showDebugBorders != showDebugBorders;
m_hasAcceleratedCompositing = hasAcceleratedCompositing;
m_forceCompositingMode = forceCompositingMode;
m_showDebugBorders = showDebugBorders;
m_showRepaintCounter = showRepaintCounter;
m_acceleratedDrawingEnabled = acceleratedDrawingEnabled;
m_displayListDrawingEnabled = displayListDrawingEnabled;
if (debugBordersChanged) {
if (m_layerForHorizontalScrollbar)
m_layerForHorizontalScrollbar->setShowDebugBorder(m_showDebugBorders);
if (m_layerForVerticalScrollbar)
m_layerForVerticalScrollbar->setShowDebugBorder(m_showDebugBorders);
if (m_layerForScrollCorner)
m_layerForScrollCorner->setShowDebugBorder(m_showDebugBorders);
}
if (updateCompositingPolicy())
rootRenderLayer().setDescendantsNeedCompositingRequirementsTraversal();
}
void RenderLayerCompositor::cacheAcceleratedCompositingFlagsAfterLayout()
{
cacheAcceleratedCompositingFlags();
if (isMainFrameCompositor())
return;
RequiresCompositingData queryData;
bool forceCompositingMode = m_hasAcceleratedCompositing && m_renderView.settings().forceCompositingMode() && requiresCompositingForScrollableFrame(queryData);
if (forceCompositingMode != m_forceCompositingMode) {
m_forceCompositingMode = forceCompositingMode;
rootRenderLayer().setDescendantsNeedCompositingRequirementsTraversal();
}
}
bool RenderLayerCompositor::updateCompositingPolicy()
{
if (!usesCompositing())
return false;
auto currentPolicy = m_compositingPolicy;
if (page().compositingPolicyOverride()) {
m_compositingPolicy = page().compositingPolicyOverride().value();
return m_compositingPolicy != currentPolicy;
}
static auto cachedMemoryPolicy = WTF::MemoryUsagePolicy::Unrestricted;
static MonotonicTime cachedMemoryPolicyTime;
static constexpr auto memoryPolicyCachingDuration = 2_s;
auto now = MonotonicTime::now();
if (now - cachedMemoryPolicyTime > memoryPolicyCachingDuration) {
cachedMemoryPolicy = MemoryPressureHandler::singleton().currentMemoryUsagePolicy();
cachedMemoryPolicyTime = now;
}
m_compositingPolicy = cachedMemoryPolicy == WTF::MemoryUsagePolicy::Unrestricted ? CompositingPolicy::Normal : CompositingPolicy::Conservative;
return m_compositingPolicy != currentPolicy;
}
bool RenderLayerCompositor::canRender3DTransforms() const
{
return hasAcceleratedCompositing() && (m_compositingTriggers & ChromeClient::ThreeDTransformTrigger);
}
void RenderLayerCompositor::willRecalcStyle()
{
cacheAcceleratedCompositingFlags();
}
bool RenderLayerCompositor::didRecalcStyleWithNoPendingLayout()
{
return updateCompositingLayers(CompositingUpdateType::AfterStyleChange);
}
void RenderLayerCompositor::customPositionForVisibleRectComputation(const GraphicsLayer* graphicsLayer, FloatPoint& position) const
{
if (graphicsLayer != m_scrolledContentsLayer.get())
return;
FloatPoint scrollPosition = -position;
if (m_renderView.frameView().scrollBehaviorForFixedElements() == StickToDocumentBounds)
scrollPosition = m_renderView.frameView().constrainScrollPositionForOverhang(roundedIntPoint(scrollPosition));
position = -scrollPosition;
}
void RenderLayerCompositor::notifyFlushRequired(const GraphicsLayer*)
{
scheduleRenderingUpdate();
}
void RenderLayerCompositor::scheduleRenderingUpdate()
{
ASSERT(!m_flushingLayers);
page().scheduleRenderingUpdate(RenderingUpdateStep::LayerFlush);
}
FloatRect RenderLayerCompositor::visibleRectForLayerFlushing() const
{
const FrameView& frameView = m_renderView.frameView();
#if PLATFORM(IOS_FAMILY)
return frameView.exposedContentRect();
#else
// Having a m_scrolledContentsLayer indicates that we're doing scrolling via GraphicsLayers.
FloatRect visibleRect = m_scrolledContentsLayer ? FloatRect({ }, frameView.sizeForVisibleContent()) : frameView.visibleContentRect();
if (auto exposedRect = frameView.viewExposedRect())
visibleRect.intersect(*exposedRect);
return visibleRect;
#endif
}
void RenderLayerCompositor::flushPendingLayerChanges(bool isFlushRoot)
{
// FrameView::flushCompositingStateIncludingSubframes() flushes each subframe,
// but GraphicsLayer::flushCompositingState() will cross frame boundaries
// if the GraphicsLayers are connected (the RootLayerAttachedViaEnclosingFrame case).
// As long as we're not the root of the flush, we can bail.
if (!isFlushRoot && rootLayerAttachment() == RootLayerAttachedViaEnclosingFrame)
return;
if (rootLayerAttachment() == RootLayerUnattached) {
m_shouldFlushOnReattach = true;
return;
}
ASSERT(!m_flushingLayers);
{
SetForScope flushingLayersScope(m_flushingLayers, true);
if (auto* rootLayer = rootGraphicsLayer()) {
#if ENABLE(ASYNC_SCROLLING) && ENABLE(SCROLLING_THREAD)
LayerTreeHitTestLocker layerLocker(scrollingCoordinator());
#endif
FloatRect visibleRect = visibleRectForLayerFlushing();
LOG_WITH_STREAM(Compositing, stream << "\nRenderLayerCompositor " << this << " flushPendingLayerChanges (is root " << isFlushRoot << ") visible rect " << visibleRect);
rootLayer->flushCompositingState(visibleRect);
}
ASSERT(m_flushingLayers);
#if ENABLE(TREE_DEBUGGING)
if (layersLogEnabled()) {
LOG(Layers, "RenderLayerCompositor::flushPendingLayerChanges");
showGraphicsLayerTree(rootGraphicsLayer());
}
#endif
}
#if PLATFORM(IOS_FAMILY)
updateScrollCoordinatedLayersAfterFlushIncludingSubframes();
if (isFlushRoot)
page().chrome().client().didFlushCompositingLayers();
#endif
++m_layerFlushCount;
}
#if PLATFORM(IOS_FAMILY)
void RenderLayerCompositor::updateScrollCoordinatedLayersAfterFlushIncludingSubframes()
{
updateScrollCoordinatedLayersAfterFlush();
auto& frame = m_renderView.frameView().frame();
for (Frame* subframe = frame.tree().firstChild(); subframe; subframe = subframe->tree().traverseNext(&frame)) {
auto* view = subframe->contentRenderer();
if (!view)
continue;
view->compositor().updateScrollCoordinatedLayersAfterFlush();
}
}
void RenderLayerCompositor::updateScrollCoordinatedLayersAfterFlush()
{
if (m_legacyScrollingLayerCoordinator) {
m_legacyScrollingLayerCoordinator->registerAllViewportConstrainedLayers(*this);
m_legacyScrollingLayerCoordinator->registerAllScrollingLayers();
}
}
#endif
void RenderLayerCompositor::didChangePlatformLayerForLayer(RenderLayer& layer, const GraphicsLayer*)
{
auto* scrollingCoordinator = this->scrollingCoordinator();
if (!scrollingCoordinator)
return;
auto* backing = layer.backing();
if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::Scrolling))
updateScrollingNodeLayers(nodeID, layer, *scrollingCoordinator);
if (auto* clippingStack = layer.backing()->ancestorClippingStack())
clippingStack->updateScrollingNodeLayers(*scrollingCoordinator);
if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::ViewportConstrained))
scrollingCoordinator->setNodeLayers(nodeID, { backing->graphicsLayer() });
if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::FrameHosting))
scrollingCoordinator->setNodeLayers(nodeID, { backing->graphicsLayer() });
if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::Positioning))
scrollingCoordinator->setNodeLayers(nodeID, { backing->graphicsLayer() });
}
void RenderLayerCompositor::didPaintBacking(RenderLayerBacking*)
{
auto& frameView = m_renderView.frameView();
frameView.setLastPaintTime(MonotonicTime::now());
if (frameView.milestonesPendingPaint())
frameView.firePaintRelatedMilestonesIfNeeded();
}
void RenderLayerCompositor::didChangeVisibleRect()
{
auto* rootLayer = rootGraphicsLayer();
if (!rootLayer)
return;
FloatRect visibleRect = visibleRectForLayerFlushing();
bool requiresFlush = rootLayer->visibleRectChangeRequiresFlush(visibleRect);
LOG_WITH_STREAM(Compositing, stream << "RenderLayerCompositor::didChangeVisibleRect " << visibleRect << " requiresFlush " << requiresFlush);
if (requiresFlush)
scheduleRenderingUpdate();
}
void RenderLayerCompositor::notifyFlushBeforeDisplayRefresh(const GraphicsLayer*)
{
if (!m_layerUpdater) {
PlatformDisplayID displayID = page().chrome().displayID();
m_layerUpdater = makeUnique<GraphicsLayerUpdater>(*this, displayID);
}
m_layerUpdater->scheduleUpdate();
}
void RenderLayerCompositor::flushLayersSoon(GraphicsLayerUpdater&)
{
scheduleRenderingUpdate();
}
DisplayRefreshMonitorFactory* RenderLayerCompositor::displayRefreshMonitorFactory()
{
return page().chrome().client().displayRefreshMonitorFactory();
}
void RenderLayerCompositor::layerTiledBackingUsageChanged(const GraphicsLayer* graphicsLayer, bool usingTiledBacking)
{
if (usingTiledBacking) {
++m_layersWithTiledBackingCount;
graphicsLayer->tiledBacking()->setIsInWindow(page().isInWindow());
} else {
ASSERT(m_layersWithTiledBackingCount > 0);
--m_layersWithTiledBackingCount;
}
}
void RenderLayerCompositor::scheduleCompositingLayerUpdate()
{
if (!m_updateCompositingLayersTimer.isActive())
m_updateCompositingLayersTimer.startOneShot(0_s);
}
void RenderLayerCompositor::updateCompositingLayersTimerFired()
{
updateCompositingLayers(CompositingUpdateType::AfterLayout);
}
void RenderLayerCompositor::cancelCompositingLayerUpdate()
{
m_updateCompositingLayersTimer.stop();
}
template<typename ApplyFunctionType>
void RenderLayerCompositor::applyToCompositedLayerIncludingDescendants(RenderLayer& layer, const ApplyFunctionType& function)
{
if (layer.isComposited())
function(layer);
for (auto* childLayer = layer.firstChild(); childLayer; childLayer = childLayer->nextSibling())
applyToCompositedLayerIncludingDescendants(*childLayer, function);
}
void RenderLayerCompositor::updateEventRegions()
{
#if ENABLE(ASYNC_SCROLLING)
applyToCompositedLayerIncludingDescendants(*m_renderView.layer(), [](auto& layer) {
layer.backing()->updateEventRegion();
});
#endif
}
static std::optional<ScrollingNodeID> frameHostingNodeForFrame(Frame& frame)
{
if (!frame.document() || !frame.view())
return { };
// Find the frame's enclosing layer in our render tree.
auto* ownerElement = frame.document()->ownerElement();
if (!ownerElement)
return { };
auto* frameRenderer = ownerElement->renderer();
if (!frameRenderer || !is<RenderWidget>(frameRenderer))
return { };
auto& widgetRenderer = downcast<RenderWidget>(*frameRenderer);
if (!widgetRenderer.hasLayer() || !widgetRenderer.layer()->isComposited()) {
LOG(Scrolling, "frameHostingNodeForFrame: frame renderer has no layer or is not composited.");
return { };
}
if (auto frameHostingNodeID = widgetRenderer.layer()->backing()->scrollingNodeIDForRole(ScrollCoordinationRole::FrameHosting))
return frameHostingNodeID;
return { };
}
// Returns true on a successful update.
bool RenderLayerCompositor::updateCompositingLayers(CompositingUpdateType updateType, RenderLayer* updateRoot)
{
LOG_WITH_STREAM(Compositing, stream << "RenderLayerCompositor " << this << " [" << m_renderView.frameView() << "] updateCompositingLayers " << updateType << " contentLayersCount " << m_contentLayersCount);
TraceScope tracingScope(CompositingUpdateStart, CompositingUpdateEnd);
#if ENABLE(TREE_DEBUGGING)
if (compositingLogEnabled())
showPaintOrderTree(m_renderView.layer());
#endif
if (updateType == CompositingUpdateType::AfterStyleChange || updateType == CompositingUpdateType::AfterLayout)
cacheAcceleratedCompositingFlagsAfterLayout(); // Some flags (e.g. forceCompositingMode) depend on layout.
m_updateCompositingLayersTimer.stop();
ASSERT(m_renderView.document().backForwardCacheState() == Document::NotInBackForwardCache
|| m_renderView.document().backForwardCacheState() == Document::AboutToEnterBackForwardCache);
// Compositing layers will be updated in Document::setVisualUpdatesAllowed(bool) if suppressed here.
if (!m_renderView.document().visualUpdatesAllowed())
return false;
// Avoid updating the layers with old values. Compositing layers will be updated after the layout is finished.
// This happens when m_updateCompositingLayersTimer fires before layout is updated.
if (m_renderView.needsLayout()) {
LOG_WITH_STREAM(Compositing, stream << "RenderLayerCompositor " << this << " updateCompositingLayers " << updateType << " - m_renderView.needsLayout, bailing ");
return false;
}
if (!m_compositing && (m_forceCompositingMode || (isMainFrameCompositor() && page().pageOverlayController().overlayCount())))
enableCompositingMode(true);
bool isPageScroll = !updateRoot || updateRoot == &rootRenderLayer();
updateRoot = &rootRenderLayer();
if (updateType == CompositingUpdateType::OnScroll || updateType == CompositingUpdateType::OnCompositedScroll) {
// We only get here if we didn't scroll on the scrolling thread, so this update needs to re-position viewport-constrained layers.
if (m_renderView.settings().acceleratedCompositingForFixedPositionEnabled() && isPageScroll) {
if (auto* viewportConstrainedObjects = m_renderView.frameView().viewportConstrainedObjects()) {
for (auto& renderer : *viewportConstrainedObjects) {
if (auto* layer = renderer.layer())
layer->setNeedsCompositingGeometryUpdate();
}
}
}
// Scrolling can affect overlap. FIXME: avoid for page scrolling.
updateRoot->setDescendantsNeedCompositingRequirementsTraversal();
}
if (updateType == CompositingUpdateType::AfterLayout) {
// Ensure that post-layout updates push new scroll position and viewport rects onto the root node.
rootRenderLayer().setNeedsScrollingTreeUpdate();
}
if (!updateRoot->hasDescendantNeedingCompositingRequirementsTraversal() && !m_compositing) {
LOG_WITH_STREAM(Compositing, stream << " no compositing work to do");
return true;
}
if (!updateRoot->needsAnyCompositingTraversal()) {
LOG_WITH_STREAM(Compositing, stream << " updateRoot has no dirty child and doesn't need update");
return true;
}
++m_compositingUpdateCount;
#if !LOG_DISABLED
MonotonicTime startTime;
if (compositingLogEnabled()) {
++m_rootLayerUpdateCount;
startTime = MonotonicTime::now();
}
if (compositingLogEnabled()) {
m_obligateCompositedLayerCount = 0;
m_secondaryCompositedLayerCount = 0;
m_obligatoryBackingStoreBytes = 0;
m_secondaryBackingStoreBytes = 0;
auto& frame = m_renderView.frameView().frame();
bool isMainFrame = isMainFrameCompositor();
LOG_WITH_STREAM(Compositing, stream << "\nUpdate " << m_rootLayerUpdateCount << " of " << (isMainFrame ? "main frame" : frame.tree().uniqueName().string().utf8().data()) << " - compositing policy is " << m_compositingPolicy);
}
#endif
// FIXME: optimize root-only update.
if (updateRoot->hasDescendantNeedingCompositingRequirementsTraversal() || updateRoot->needsCompositingRequirementsTraversal()) {
auto& rootLayer = rootRenderLayer();
CompositingState compositingState(updateRoot);
BackingSharingState backingSharingState;
LayerOverlapMap overlapMap(rootLayer);
bool descendantHas3DTransform = false;
computeCompositingRequirements(nullptr, rootLayer, overlapMap, compositingState, backingSharingState, descendantHas3DTransform);
}
LOG(Compositing, "\nRenderLayerCompositor::updateCompositingLayers - mid");
#if ENABLE(TREE_DEBUGGING)
if (compositingLogEnabled())
showPaintOrderTree(m_renderView.layer());
#endif
if (updateRoot->hasDescendantNeedingUpdateBackingOrHierarchyTraversal() || updateRoot->needsUpdateBackingOrHierarchyTraversal()) {
ScrollingTreeState scrollingTreeState = { 0, 0 };
if (!m_renderView.frame().isMainFrame())
scrollingTreeState.parentNodeID = frameHostingNodeForFrame(m_renderView.frame());
auto* scrollingCoordinator = this->scrollingCoordinator();
bool hadSubscrollers = scrollingCoordinator ? scrollingCoordinator->hasSubscrollers() : false;
UpdateBackingTraversalState traversalState;
Vector<Ref<GraphicsLayer>> childList;
updateBackingAndHierarchy(*updateRoot, childList, traversalState, scrollingTreeState);
if (scrollingTreeState.needSynchronousScrollingReasonsUpdate)
updateSynchronousScrollingNodes();
// Host the document layer in the RenderView's root layer.
appendDocumentOverlayLayers(childList);
// Even when childList is empty, don't drop out of compositing mode if there are
// composited layers that we didn't hit in our traversal (e.g. because of visibility:hidden).
if (childList.isEmpty() && !needsCompositingForContentOrOverlays())
destroyRootLayer();
else if (m_rootContentsLayer)
m_rootContentsLayer->setChildren(WTFMove(childList));
if (scrollingCoordinator && scrollingCoordinator->hasSubscrollers() != hadSubscrollers)
invalidateEventRegionForAllFrames();
}
#if !LOG_DISABLED
if (compositingLogEnabled()) {
MonotonicTime endTime = MonotonicTime::now();
LOG(Compositing, "Total layers primary secondary obligatory backing (KB) secondary backing(KB) total backing (KB) update time (ms)\n");
LOG(Compositing, "%8d %11d %9d %20.2f %22.2f %22.2f %18.2f\n",
m_obligateCompositedLayerCount + m_secondaryCompositedLayerCount, m_obligateCompositedLayerCount,
m_secondaryCompositedLayerCount, m_obligatoryBackingStoreBytes / 1024, m_secondaryBackingStoreBytes / 1024, (m_obligatoryBackingStoreBytes + m_secondaryBackingStoreBytes) / 1024, (endTime - startTime).milliseconds());
}
#endif
// FIXME: Only do if dirty.
updateRootLayerPosition();
#if ENABLE(TREE_DEBUGGING)
if (compositingLogEnabled()) {
LOG(Compositing, "RenderLayerCompositor::updateCompositingLayers - post");
showPaintOrderTree(m_renderView.layer());
}
#endif
InspectorInstrumentation::layerTreeDidChange(&page());
if (m_renderView.needsRepaintHackAfterCompositingLayerUpdateForDebugOverlaysOnly()) {
m_renderView.repaintRootContents();
m_renderView.setNeedsRepaintHackAfterCompositingLayerUpdateForDebugOverlaysOnly(false);
}
return true;
}
void RenderLayerCompositor::computeCompositingRequirements(RenderLayer* ancestorLayer, RenderLayer& layer, LayerOverlapMap& overlapMap, CompositingState& compositingState, BackingSharingState& backingSharingState, bool& descendantHas3DTransform)
{
layer.updateDescendantDependentFlags();
layer.updateLayerListsIfNeeded();
if (!layer.hasDescendantNeedingCompositingRequirementsTraversal()
&& !layer.needsCompositingRequirementsTraversal()
&& !compositingState.fullPaintOrderTraversalRequired
&& !compositingState.descendantsRequireCompositingUpdate) {
traverseUnchangedSubtree(ancestorLayer, layer, overlapMap, compositingState, backingSharingState, descendantHas3DTransform);
return;
}
LOG_WITH_STREAM(Compositing, stream << TextStream::Repeat(compositingState.depth * 2, ' ') << &layer << (layer.isNormalFlowOnly() ? " n" : " s") << " computeCompositingRequirements (backing provider candidate " << backingSharingState.backingProviderCandidate() << ")");
// FIXME: maybe we can avoid updating all remaining layers in paint order.
compositingState.fullPaintOrderTraversalRequired |= layer.needsCompositingRequirementsTraversal();
compositingState.descendantsRequireCompositingUpdate |= layer.descendantsNeedCompositingRequirementsTraversal();
layer.setHasCompositingDescendant(false);
// We updated compositing for direct reasons in layerStyleChanged(). Here, check for compositing that can only be evaluated after layout.
RequiresCompositingData queryData;
bool willBeComposited = layer.isComposited();
bool becameCompositedAfterDescendantTraversal = false;
IndirectCompositingReason compositingReason = compositingState.subtreeIsCompositing ? IndirectCompositingReason::Stacking : IndirectCompositingReason::None;
if (layer.needsPostLayoutCompositingUpdate() || compositingState.fullPaintOrderTraversalRequired || compositingState.descendantsRequireCompositingUpdate) {
layer.setIndirectCompositingReason(IndirectCompositingReason::None);
willBeComposited = needsToBeComposited(layer, queryData);
}
bool layerPaintsIntoProvidedBacking = false;
if (!willBeComposited && compositingState.subtreeIsCompositing && canBeComposited(layer) && backingSharingState.canIncludeLayer(layer)) {
backingSharingState.appendSharingLayer(layer);
LOG_WITH_STREAM(Compositing, stream << " layer " << &layer << " can share with " << backingSharingState.backingProviderCandidate());
compositingReason = IndirectCompositingReason::None;
layerPaintsIntoProvidedBacking = true;