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RenderLayerBacking.cpp
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RenderLayerBacking.cpp
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/*
* Copyright (C) 2009, 2010, 2011 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 "RenderLayerBacking.h"
#include "BitmapImage.h"
#include "CanvasRenderingContext.h"
#include "CSSPropertyNames.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "DebugOverlayRegions.h"
#include "EventRegion.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "GraphicsLayer.h"
#include "HTMLBodyElement.h"
#include "HTMLCanvasElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLMediaElement.h"
#include "HTMLModelElement.h"
#include "HTMLNames.h"
#include "HTMLPlugInElement.h"
#include "InspectorInstrumentation.h"
#include "KeyframeList.h"
#include "LayerAncestorClippingStack.h"
#include "Logging.h"
#include "Model.h"
#include "NullGraphicsContext.h"
#include "Page.h"
#include "PerformanceLoggingClient.h"
#include "PluginViewBase.h"
#include "ProgressTracker.h"
#include "RenderEmbeddedObject.h"
#include "RenderFragmentContainer.h"
#include "RenderFragmentedFlow.h"
#include "RenderHTMLCanvas.h"
#include "RenderIFrame.h"
#include "RenderImage.h"
#include "RenderLayerCompositor.h"
#include "RenderLayerScrollableArea.h"
#include "RenderMedia.h"
#include "RenderModel.h"
#include "RenderSVGModelObject.h"
#include "RenderVideo.h"
#include "RenderView.h"
#include "RuntimeEnabledFeatures.h"
#include "ScrollingCoordinator.h"
#include "Settings.h"
#include "StyleResolver.h"
#include "Styleable.h"
#include "TiledBacking.h"
#include <wtf/SystemTracing.h>
#include <wtf/text/TextStream.h>
#if PLATFORM(IOS_FAMILY)
#include "RuntimeApplicationChecks.h"
#endif
#if PLATFORM(MAC)
#include "LocalDefaultSystemAppearance.h"
#endif
namespace WebCore {
using namespace HTMLNames;
CanvasCompositingStrategy canvasCompositingStrategy(const RenderObject& renderer)
{
ASSERT(renderer.isCanvas());
const HTMLCanvasElement* canvas = downcast<HTMLCanvasElement>(renderer.node());
auto* context = canvas->renderingContext();
if (!context || !context->isAccelerated())
return UnacceleratedCanvas;
if (context->isGPUBased())
return CanvasAsLayerContents;
return CanvasPaintedToLayer; // On Mac and iOS we paint accelerated canvases into their layers.
}
// This acts as a cache of what we know about what is painting into this RenderLayerBacking.
class PaintedContentsInfo {
public:
enum class ContentsTypeDetermination {
Unknown,
SimpleContainer,
DirectlyCompositedImage,
Painted
};
PaintedContentsInfo(RenderLayerBacking& inBacking)
: m_backing(inBacking)
{
}
void setWantsSubpixelAntialiasedTextState(bool wantsSubpixelAntialiasedTextState)
{
m_subpixelAntialiasedText = wantsSubpixelAntialiasedTextState ? RequestState::Unknown : RequestState::DontCare;
}
RequestState paintsBoxDecorationsDetermination();
bool paintsBoxDecorations()
{
RequestState state = paintsBoxDecorationsDetermination();
return state == RequestState::True || state == RequestState::Undetermined;
}
RequestState paintsContentDetermination();
bool paintsContent()
{
RequestState state = paintsContentDetermination();
return state == RequestState::True || state == RequestState::Undetermined;
}
RequestState paintsSubpixelAntialiasedTextDetermination();
bool paintsSubpixelAntialiasedText()
{
RequestState state = paintsSubpixelAntialiasedTextDetermination();
return state == RequestState::True || state == RequestState::Undetermined;
}
ContentsTypeDetermination contentsTypeDetermination();
bool isSimpleContainer()
{
return contentsTypeDetermination() == ContentsTypeDetermination::SimpleContainer;
}
bool isDirectlyCompositedImage()
{
return contentsTypeDetermination() == ContentsTypeDetermination::DirectlyCompositedImage;
}
RenderLayerBacking& m_backing;
RequestState m_boxDecorations { RequestState::Unknown };
RequestState m_content { RequestState::Unknown };
RequestState m_subpixelAntialiasedText { RequestState::DontCare };
ContentsTypeDetermination m_contentsType { ContentsTypeDetermination::Unknown };
};
RequestState PaintedContentsInfo::paintsBoxDecorationsDetermination()
{
if (m_boxDecorations != RequestState::Unknown)
return m_boxDecorations;
m_boxDecorations = m_backing.paintsBoxDecorations() ? RequestState::True : RequestState::False;
return m_boxDecorations;
}
RequestState PaintedContentsInfo::paintsContentDetermination()
{
if (m_content != RequestState::Unknown && m_subpixelAntialiasedText != RequestState::Unknown)
return m_content;
RenderLayer::PaintedContentRequest contentRequest;
if (m_subpixelAntialiasedText == RequestState::Unknown)
contentRequest.hasSubpixelAntialiasedText = RequestState::Unknown;
m_content = m_backing.paintsContent(contentRequest) ? RequestState::True : RequestState::False;
if (m_subpixelAntialiasedText == RequestState::Unknown)
m_subpixelAntialiasedText = contentRequest.hasSubpixelAntialiasedText;
return m_content;
}
RequestState PaintedContentsInfo::paintsSubpixelAntialiasedTextDetermination()
{
if (m_subpixelAntialiasedText != RequestState::Unknown)
return m_subpixelAntialiasedText;
paintsContentDetermination();
return m_subpixelAntialiasedText;
}
PaintedContentsInfo::ContentsTypeDetermination PaintedContentsInfo::contentsTypeDetermination()
{
if (m_contentsType != ContentsTypeDetermination::Unknown)
return m_contentsType;
if (m_backing.isSimpleContainerCompositingLayer(*this))
m_contentsType = ContentsTypeDetermination::SimpleContainer;
else if (m_backing.isDirectlyCompositedImage())
m_contentsType = ContentsTypeDetermination::DirectlyCompositedImage;
else
m_contentsType = ContentsTypeDetermination::Painted;
return m_contentsType;
}
RenderLayerBacking::RenderLayerBacking(RenderLayer& layer)
: m_owningLayer(layer)
{
if (layer.isRenderViewLayer()) {
m_isMainFrameRenderViewLayer = renderer().frame().isMainFrame();
m_isFrameLayerWithTiledBacking = renderer().page().chrome().client().shouldUseTiledBackingForFrameView(renderer().view().frameView());
}
createPrimaryGraphicsLayer();
#if ENABLE(FULLSCREEN_API)
setRequiresBackgroundLayer(layer.renderer().isRenderFullScreen());
#endif
if (auto* tiledBacking = this->tiledBacking()) {
tiledBacking->setIsInWindow(renderer().page().isInWindow());
if (m_isFrameLayerWithTiledBacking) {
tiledBacking->setScrollingPerformanceTestingEnabled(renderer().settings().scrollingPerformanceTestingEnabled());
adjustTiledBackingCoverage();
}
}
}
RenderLayerBacking::~RenderLayerBacking()
{
#if USE(OWNING_LAYER_BEAR_TRAP)
RELEASE_ASSERT_WITH_MESSAGE(m_owningLayerBearTrap == BEAR_TRAP_VALUE, "~RenderLayerBacking: m_owningLayerBearTrap caught the bear (55699292)");
RELEASE_ASSERT_WITH_MESSAGE(&m_owningLayer, "~RenderLayerBacking: m_owningLayer is null (55699292)");
#endif
// Note that m_owningLayer->backing() is null here.
updateAncestorClipping(false, nullptr);
updateChildClippingStrategy(false);
updateDescendantClippingLayer(false);
updateOverflowControlsLayers(false, false, false);
updateForegroundLayer(false);
updateBackgroundLayer(false);
updateMaskingLayer(false, false);
updateScrollingLayers(false);
ASSERT(!m_viewportConstrainedNodeID);
ASSERT(!m_scrollingNodeID);
ASSERT(!m_frameHostingNodeID);
ASSERT(!m_positioningNodeID);
destroyGraphicsLayers();
}
void RenderLayerBacking::willBeDestroyed()
{
#if USE(OWNING_LAYER_BEAR_TRAP)
RELEASE_ASSERT_WITH_MESSAGE(m_owningLayerBearTrap == BEAR_TRAP_VALUE, "RenderLayerBacking::willBeDestroyed(): m_owningLayerBearTrap caught the bear (55699292)");
RELEASE_ASSERT_WITH_MESSAGE(&m_owningLayer, "RenderLayerBacking::willBeDestroyed(): m_owningLayer is null (55699292)");
#endif
ASSERT(m_owningLayer.backing() == this);
compositor().removeFromScrollCoordinatedLayers(m_owningLayer);
clearBackingSharingLayers();
}
void RenderLayerBacking::willDestroyLayer(const GraphicsLayer* layer)
{
if (layer && layer->type() == GraphicsLayer::Type::Normal && layer->tiledBacking())
compositor().layerTiledBackingUsageChanged(layer, false);
}
static void clearBackingSharingLayerProviders(Vector<WeakPtr<RenderLayer>>& sharingLayers, const RenderLayer& providerLayer)
{
for (auto& layerWeakPtr : sharingLayers) {
if (!layerWeakPtr)
continue;
if (layerWeakPtr->backingProviderLayer() == &providerLayer)
layerWeakPtr->setBackingProviderLayer(nullptr);
}
}
void RenderLayerBacking::setBackingSharingLayers(Vector<WeakPtr<RenderLayer>>&& sharingLayers)
{
bool sharingLayersChanged = m_backingSharingLayers != sharingLayers;
if (sharingLayersChanged) {
// For layers that used to share and no longer do, and are not composited, recompute repaint rects.
for (auto& oldSharingLayer : m_backingSharingLayers) {
// Layers that go from shared to composited have their repaint rects recomputed in RenderLayerCompositor::updateBacking().
// FIXME: Two O(n^2) traversals in this funtion. Probably OK because sharing lists are usually small, but still.
if (!sharingLayers.contains(oldSharingLayer) && !oldSharingLayer->isComposited())
oldSharingLayer->computeRepaintRectsIncludingDescendants();
}
}
clearBackingSharingLayerProviders(m_backingSharingLayers, m_owningLayer);
if (sharingLayers != m_backingSharingLayers) {
if (sharingLayers.size())
setRequiresOwnBackingStore(true);
setContentsNeedDisplay(); // This could be optimized to only repaint rects for changed layers.
}
auto oldSharingLayers = WTFMove(m_backingSharingLayers);
m_backingSharingLayers = WTFMove(sharingLayers);
for (auto& layerWeakPtr : m_backingSharingLayers)
layerWeakPtr->setBackingProviderLayer(&m_owningLayer);
if (sharingLayersChanged) {
// For layers that are newly sharing, recompute repaint rects.
for (auto& currentSharingLayer : m_backingSharingLayers) {
if (!oldSharingLayers.contains(currentSharingLayer))
currentSharingLayer->computeRepaintRectsIncludingDescendants();
}
}
}
void RenderLayerBacking::removeBackingSharingLayer(RenderLayer& layer)
{
layer.setBackingProviderLayer(nullptr);
m_backingSharingLayers.removeAll(&layer);
}
void RenderLayerBacking::clearBackingSharingLayers()
{
clearBackingSharingLayerProviders(m_backingSharingLayers, m_owningLayer);
m_backingSharingLayers.clear();
}
Ref<GraphicsLayer> RenderLayerBacking::createGraphicsLayer(const String& name, GraphicsLayer::Type layerType)
{
auto* graphicsLayerFactory = renderer().page().chrome().client().graphicsLayerFactory();
auto graphicsLayer = GraphicsLayer::create(graphicsLayerFactory, *this, layerType);
graphicsLayer->setName(name);
#if PLATFORM(COCOA) && USE(CA)
graphicsLayer->setAcceleratesDrawing(compositor().acceleratedDrawingEnabled());
graphicsLayer->setUsesDisplayListDrawing(compositor().displayListDrawingEnabled());
#endif
return graphicsLayer;
}
void RenderLayerBacking::setUsesDisplayListDrawing(bool usesDisplayListDrawing)
{
// Note that this only affects the primary layer.
if (usesDisplayListDrawing == m_graphicsLayer->usesDisplayListDrawing())
return;
m_graphicsLayer->setUsesDisplayListDrawing(usesDisplayListDrawing);
if (m_graphicsLayer->drawsContent())
m_graphicsLayer->setNeedsDisplay();
}
String RenderLayerBacking::displayListAsText(OptionSet<DisplayList::AsTextFlag> flags) const
{
return m_graphicsLayer->displayListAsText(flags);
}
void RenderLayerBacking::setIsTrackingDisplayListReplay(bool isTrackingReplay)
{
m_graphicsLayer->setIsTrackingDisplayListReplay(isTrackingReplay);
}
String RenderLayerBacking::replayDisplayListAsText(OptionSet<DisplayList::AsTextFlag> flags) const
{
return m_graphicsLayer->replayDisplayListAsText(flags);
}
void RenderLayerBacking::tiledBackingUsageChanged(const GraphicsLayer* layer, bool usingTiledBacking)
{
compositor().layerTiledBackingUsageChanged(layer, usingTiledBacking);
}
TiledBacking* RenderLayerBacking::tiledBacking() const
{
return m_graphicsLayer->tiledBacking();
}
static TiledBacking::TileCoverage computePageTiledBackingCoverage(const RenderLayer& layer)
{
// If the page is non-visible, don't incur the cost of keeping extra tiles for scrolling.
if (!layer.page().isVisible())
return TiledBacking::CoverageForVisibleArea;
auto& frameView = layer.renderer().view().frameView();
TiledBacking::TileCoverage tileCoverage = TiledBacking::CoverageForVisibleArea;
bool useMinimalTilesDuringLiveResize = frameView.inLiveResize();
if (frameView.speculativeTilingEnabled() && !useMinimalTilesDuringLiveResize) {
bool clipsToExposedRect = static_cast<bool>(frameView.viewExposedRect());
if (frameView.horizontalScrollbarMode() != ScrollbarMode::AlwaysOff || clipsToExposedRect)
tileCoverage |= TiledBacking::CoverageForHorizontalScrolling;
if (frameView.verticalScrollbarMode() != ScrollbarMode::AlwaysOff || clipsToExposedRect)
tileCoverage |= TiledBacking::CoverageForVerticalScrolling;
}
return tileCoverage;
}
static TiledBacking::TileCoverage computeOverflowTiledBackingCoverage(const RenderLayer& layer)
{
// If the page is non-visible, don't incur the cost of keeping extra tiles for scrolling.
if (!layer.page().isVisible())
return TiledBacking::CoverageForVisibleArea;
auto& frameView = layer.renderer().view().frameView();
TiledBacking::TileCoverage tileCoverage = TiledBacking::CoverageForVisibleArea;
bool useMinimalTilesDuringLiveResize = frameView.inLiveResize();
if (!useMinimalTilesDuringLiveResize) {
if (auto* scrollableArea = layer.scrollableArea()) {
if (scrollableArea->hasScrollableHorizontalOverflow())
tileCoverage |= TiledBacking::CoverageForHorizontalScrolling;
if (scrollableArea->hasScrollableVerticalOverflow())
tileCoverage |= TiledBacking::CoverageForVerticalScrolling;
}
}
return tileCoverage;
}
void RenderLayerBacking::adjustTiledBackingCoverage()
{
if (m_isFrameLayerWithTiledBacking) {
auto tileCoverage = computePageTiledBackingCoverage(m_owningLayer);
if (auto* tiledBacking = this->tiledBacking())
tiledBacking->setTileCoverage(tileCoverage);
}
if (m_owningLayer.hasCompositedScrollableOverflow() && m_scrolledContentsLayer) {
if (auto* tiledBacking = m_scrolledContentsLayer->tiledBacking()) {
auto tileCoverage = computeOverflowTiledBackingCoverage(m_owningLayer);
tiledBacking->setTileCoverage(tileCoverage);
}
}
}
void RenderLayerBacking::setTiledBackingHasMargins(bool hasExtendedBackgroundOnLeftAndRight, bool hasExtendedBackgroundOnTopAndBottom)
{
if (!m_isFrameLayerWithTiledBacking)
return;
tiledBacking()->setHasMargins(hasExtendedBackgroundOnTopAndBottom, hasExtendedBackgroundOnTopAndBottom, hasExtendedBackgroundOnLeftAndRight, hasExtendedBackgroundOnLeftAndRight);
}
void RenderLayerBacking::updateDebugIndicators(bool showBorder, bool showRepaintCounter)
{
m_graphicsLayer->setShowDebugBorder(showBorder);
m_graphicsLayer->setShowRepaintCounter(showRepaintCounter);
if (m_ancestorClippingStack) {
for (auto& entry : m_ancestorClippingStack->stack())
entry.clippingLayer->setShowDebugBorder(showBorder);
}
if (m_foregroundLayer) {
m_foregroundLayer->setShowDebugBorder(showBorder);
m_foregroundLayer->setShowRepaintCounter(showRepaintCounter);
}
if (m_contentsContainmentLayer)
m_contentsContainmentLayer->setShowDebugBorder(showBorder);
if (m_childContainmentLayer)
m_childContainmentLayer->setShowDebugBorder(showBorder);
if (m_backgroundLayer) {
m_backgroundLayer->setShowDebugBorder(showBorder);
m_backgroundLayer->setShowRepaintCounter(showRepaintCounter);
}
if (m_maskLayer) {
m_maskLayer->setShowDebugBorder(showBorder);
m_maskLayer->setShowRepaintCounter(showRepaintCounter);
}
if (m_layerForHorizontalScrollbar)
m_layerForHorizontalScrollbar->setShowDebugBorder(showBorder);
if (m_layerForVerticalScrollbar)
m_layerForVerticalScrollbar->setShowDebugBorder(showBorder);
if (m_layerForScrollCorner)
m_layerForScrollCorner->setShowDebugBorder(showBorder);
if (m_scrollContainerLayer)
m_scrollContainerLayer->setShowDebugBorder(showBorder);
if (m_scrolledContentsLayer) {
m_scrolledContentsLayer->setShowDebugBorder(showBorder);
m_scrolledContentsLayer->setShowRepaintCounter(showRepaintCounter);
}
if (m_overflowControlsContainer)
m_overflowControlsContainer->setShowDebugBorder(showBorder);
}
void RenderLayerBacking::createPrimaryGraphicsLayer()
{
String layerName = m_owningLayer.name();
const unsigned maxLayerNameLength = 100;
if (layerName.length() > maxLayerNameLength)
layerName = makeString(StringView(layerName).left(maxLayerNameLength), "..."_s);
m_graphicsLayer = createGraphicsLayer(layerName, m_isFrameLayerWithTiledBacking ? GraphicsLayer::Type::PageTiledBacking : GraphicsLayer::Type::Normal);
if (m_isFrameLayerWithTiledBacking) {
m_childContainmentLayer = createGraphicsLayer("Page TiledBacking containment"_s);
m_graphicsLayer->addChild(*m_childContainmentLayer);
}
#if !PLATFORM(IOS_FAMILY)
if (m_isMainFrameRenderViewLayer) {
// Page scale is applied above the RenderView on iOS.
m_graphicsLayer->setContentsOpaque(!compositor().viewHasTransparentBackground());
m_graphicsLayer->setAppliesPageScale();
}
#endif
#if PLATFORM(COCOA) && USE(CA)
if (!compositor().acceleratedDrawingEnabled() && renderer().isCanvas()) {
const HTMLCanvasElement* canvas = downcast<HTMLCanvasElement>(renderer().element());
if (canvas->shouldAccelerate(canvas->size()))
m_graphicsLayer->setAcceleratesDrawing(true);
}
#endif
auto& style = renderer().style();
updateOpacity(style);
updateTransform(style);
updateFilters(style);
#if ENABLE(FILTERS_LEVEL_2)
updateBackdropFilters(style);
#endif
#if ENABLE(CSS_COMPOSITING)
updateBlendMode(style);
#endif
updateContentsScalingFilters(style);
}
#if PLATFORM(IOS_FAMILY)
void RenderLayerBacking::layerWillBeDestroyed()
{
auto& renderer = this->renderer();
if (is<RenderEmbeddedObject>(renderer) && downcast<RenderEmbeddedObject>(renderer).allowsAcceleratedCompositing()) {
auto* pluginViewBase = downcast<PluginViewBase>(downcast<RenderWidget>(renderer).widget());
if (pluginViewBase && m_graphicsLayer->contentsLayerForMedia())
pluginViewBase->detachPluginLayer();
}
}
bool RenderLayerBacking::needsIOSDumpRenderTreeMainFrameRenderViewLayerIsAlwaysOpaqueHack(const GraphicsLayer& layer) const
{
if (m_isMainFrameRenderViewLayer && IOSApplication::isDumpRenderTree()) {
// In iOS WebKit1 the main frame's RenderView layer is always transparent. We lie that it is opaque so that
// internals.layerTreeAsText() tests succeed.
ASSERT_UNUSED(layer, !layer.contentsOpaque());
return true;
}
return false;
}
#endif
void RenderLayerBacking::destroyGraphicsLayers()
{
if (m_graphicsLayer) {
m_graphicsLayer->setMaskLayer(nullptr);
m_graphicsLayer->setReplicatedByLayer(nullptr);
willDestroyLayer(m_graphicsLayer.get());
}
GraphicsLayer::clear(m_maskLayer);
if (m_ancestorClippingStack)
removeClippingStackLayers(*m_ancestorClippingStack);
if (m_overflowControlsHostLayerAncestorClippingStack)
removeClippingStackLayers(*m_overflowControlsHostLayerAncestorClippingStack);
GraphicsLayer::unparentAndClear(m_contentsContainmentLayer);
GraphicsLayer::unparentAndClear(m_foregroundLayer);
GraphicsLayer::unparentAndClear(m_backgroundLayer);
GraphicsLayer::unparentAndClear(m_childContainmentLayer);
GraphicsLayer::unparentAndClear(m_childClippingMaskLayer);
GraphicsLayer::unparentAndClear(m_scrollContainerLayer);
GraphicsLayer::unparentAndClear(m_scrolledContentsLayer);
GraphicsLayer::unparentAndClear(m_graphicsLayer);
}
static LayoutRect scrollContainerLayerBox(const RenderBox& renderBox)
{
return renderBox.paddingBoxRect();
}
static LayoutRect clippingLayerBox(const RenderLayerModelObject& renderer)
{
LayoutRect result = LayoutRect::infiniteRect();
if (renderer.hasNonVisibleOverflow()) {
if (is<RenderBox>(renderer))
result = downcast<RenderBox>(renderer).overflowClipRect({ }, 0); // FIXME: Incorrect for CSS regions.
#if ENABLE(LAYER_BASED_SVG_ENGINE)
else if (is<RenderSVGModelObject>(renderer))
result = downcast<RenderSVGModelObject>(renderer).overflowClipRect({ }, 0); // FIXME: Incorrect for CSS regions.
#endif
}
if (renderer.hasClip() && is<RenderBox>(renderer))
result.intersect(downcast<RenderBox>(renderer).clipRect({ }, 0)); // FIXME: Incorrect for CSS regions.
return result;
}
static LayoutRect overflowControlsHostLayerRect(const RenderBox& renderBox)
{
return renderBox.paddingBoxRectIncludingScrollbar();
}
void RenderLayerBacking::updateOpacity(const RenderStyle& style)
{
m_graphicsLayer->setOpacity(compositingOpacity(style.opacity()));
}
void RenderLayerBacking::updateTransform(const RenderStyle& style)
{
TransformationMatrix t;
if (m_owningLayer.hasTransform())
m_owningLayer.updateTransformFromStyle(t, style, RenderStyle::individualTransformOperations);
if (m_contentsContainmentLayer) {
m_contentsContainmentLayer->setTransform(t);
m_graphicsLayer->setTransform({ });
} else
m_graphicsLayer->setTransform(t);
}
void RenderLayerBacking::updateChildrenTransformAndAnchorPoint(const LayoutRect& primaryGraphicsLayerRect, LayoutSize offsetFromParentGraphicsLayer)
{
auto defaultAnchorPoint = FloatPoint3D { 0.5, 0.5, 0 };
if (!renderer().hasTransformRelatedProperty()) {
m_graphicsLayer->setAnchorPoint(defaultAnchorPoint);
if (m_contentsContainmentLayer)
m_contentsContainmentLayer->setAnchorPoint(defaultAnchorPoint);
if (m_childContainmentLayer)
m_childContainmentLayer->setAnchorPoint(defaultAnchorPoint);
if (m_scrollContainerLayer)
m_scrollContainerLayer->setAnchorPoint(defaultAnchorPoint);
if (m_scrolledContentsLayer)
m_scrolledContentsLayer->setPreserves3D(false);
return;
}
const auto deviceScaleFactor = this->deviceScaleFactor();
auto transformOrigin = m_owningLayer.transformOriginPixelSnappedIfNeeded();
auto layerOffset = roundPointToDevicePixels(toLayoutPoint(offsetFromParentGraphicsLayer), deviceScaleFactor);
auto anchor = FloatPoint3D {
primaryGraphicsLayerRect.width() ? ((layerOffset.x() - primaryGraphicsLayerRect.x()) + transformOrigin.x()) / primaryGraphicsLayerRect.width() : 0.5f,
primaryGraphicsLayerRect.height() ? ((layerOffset.y() - primaryGraphicsLayerRect.y())+ transformOrigin.y()) / primaryGraphicsLayerRect.height() : 0.5f,
transformOrigin.z()
};
if (m_contentsContainmentLayer)
m_contentsContainmentLayer->setAnchorPoint(anchor);
else
m_graphicsLayer->setAnchorPoint(anchor);
auto removeChildrenTransformFromLayers = [&](GraphicsLayer* layerToIgnore = nullptr) {
auto* clippingLayer = this->clippingLayer();
if (clippingLayer && clippingLayer != layerToIgnore) {
clippingLayer->setChildrenTransform({ });
clippingLayer->setAnchorPoint(defaultAnchorPoint);
}
if (m_scrollContainerLayer && m_scrollContainerLayer != layerToIgnore) {
m_scrollContainerLayer->setChildrenTransform({ });
m_scrollContainerLayer->setAnchorPoint(defaultAnchorPoint);
m_scrolledContentsLayer->setPreserves3D(false);
}
if (m_graphicsLayer != layerToIgnore)
m_graphicsLayer->setChildrenTransform({ });
};
if (!renderer().style().hasPerspective()) {
removeChildrenTransformFromLayers();
return;
}
auto layerForChildrenTransform = [&]() -> std::tuple<GraphicsLayer*, FloatRect> {
if (m_scrollContainerLayer) {
ASSERT(is<RenderBox>(renderer())); // Scroll container layers are only created for RenderBox derived renderers.
return std::make_tuple(m_scrollContainerLayer.get(), scrollContainerLayerBox(downcast<RenderBox>(renderer())));
}
if (auto* layer = clippingLayer())
return std::make_tuple(layer, clippingLayerBox(renderer()));
return std::make_tuple(m_graphicsLayer.get(), renderer().transformReferenceBoxRect());
};
auto [layerForPerspective, layerForPerspectiveRect] = layerForChildrenTransform();
if (layerForPerspective != m_graphicsLayer) {
// If we have scrolling layers, we need the children transform on m_scrollContainerLayer to
// affect children of m_scrolledContentsLayer, so set setPreserves3D(true).
if (layerForPerspective == m_scrollContainerLayer)
m_scrolledContentsLayer->setPreserves3D(true);
auto perspectiveAnchorPoint = FloatPoint3D {
layerForPerspectiveRect.width() ? (transformOrigin.x() - layerForPerspectiveRect.x()) / layerForPerspectiveRect.width() : 0.5f,
layerForPerspectiveRect.height() ? (transformOrigin.y() - layerForPerspectiveRect.y()) / layerForPerspectiveRect.height() : 0.5f,
transformOrigin.z()
};
layerForPerspective->setAnchorPoint(perspectiveAnchorPoint);
}
layerForPerspective->setChildrenTransform(m_owningLayer.perspectiveTransform());
removeChildrenTransformFromLayers(layerForPerspective);
}
void RenderLayerBacking::updateFilters(const RenderStyle& style)
{
m_canCompositeFilters = m_graphicsLayer->setFilters(style.filter());
}
#if ENABLE(FILTERS_LEVEL_2)
void RenderLayerBacking::updateBackdropFilters(const RenderStyle& style)
{
m_canCompositeBackdropFilters = m_graphicsLayer->setBackdropFilters(style.backdropFilter());
}
void RenderLayerBacking::updateBackdropFiltersGeometry()
{
if (!m_canCompositeBackdropFilters)
return;
if (!is<RenderBox>(renderer()))
return;
auto& renderBox = downcast<RenderBox>(this->renderer());
FloatRoundedRect backdropFiltersRect;
if (renderBox.style().hasBorderRadius() && !renderBox.hasClip()) {
auto roundedBoxRect = renderBox.roundedBorderBoxRect();
roundedBoxRect.move(contentOffsetInCompositingLayer());
backdropFiltersRect = roundedBoxRect.pixelSnappedRoundedRectForPainting(deviceScaleFactor());
} else {
auto boxRect = renderBox.borderBoxRect();
if (renderBox.hasClip())
boxRect.intersect(renderBox.clipRect(LayoutPoint(), nullptr));
boxRect.move(contentOffsetInCompositingLayer());
backdropFiltersRect = FloatRoundedRect(snapRectToDevicePixels(boxRect, deviceScaleFactor()));
}
m_graphicsLayer->setBackdropFiltersRect(backdropFiltersRect);
}
#endif
#if ENABLE(CSS_COMPOSITING)
void RenderLayerBacking::updateBlendMode(const RenderStyle& style)
{
// FIXME: where is the blend mode updated when m_ancestorClippingStacks come and go?
if (m_ancestorClippingStack) {
m_ancestorClippingStack->stack().first().clippingLayer->setBlendMode(style.blendMode());
m_graphicsLayer->setBlendMode(BlendMode::Normal);
} else
m_graphicsLayer->setBlendMode(style.blendMode());
}
#endif
void RenderLayerBacking::updateContentsScalingFilters(const RenderStyle& style)
{
if (!renderer().isCanvas() || canvasCompositingStrategy(renderer()) != CanvasAsLayerContents)
return;
auto minificationFilter = GraphicsLayer::ScalingFilter::Linear;
auto magnificationFilter = GraphicsLayer::ScalingFilter::Linear;
switch (style.imageRendering()) {
case ImageRendering::CrispEdges:
case ImageRendering::Pixelated:
// FIXME: In order to match other code-paths, we treat these the same.
minificationFilter = GraphicsLayer::ScalingFilter::Nearest;
magnificationFilter = GraphicsLayer::ScalingFilter::Nearest;
break;
default:
break;
}
m_graphicsLayer->setContentsMinificationFilter(minificationFilter);
m_graphicsLayer->setContentsMagnificationFilter(magnificationFilter);
}
static bool layerOrAncestorIsTransformedOrUsingCompositedScrolling(RenderLayer& layer)
{
for (auto* curr = &layer; curr; curr = curr->parent()) {
if (curr->hasTransform() || curr->hasCompositedScrollableOverflow())
return true;
}
return false;
}
bool RenderLayerBacking::shouldClipCompositedBounds() const
{
#if !PLATFORM(IOS_FAMILY)
// Scrollbar layers use this layer for relative positioning, so don't clip.
if (layerForHorizontalScrollbar() || layerForVerticalScrollbar())
return false;
#endif
if (m_isFrameLayerWithTiledBacking)
return false;
if (layerOrAncestorIsTransformedOrUsingCompositedScrolling(m_owningLayer))
return false;
return true;
}
static bool hasNonZeroTransformOrigin(const RenderObject& renderer)
{
const RenderStyle& style = renderer.style();
return (style.transformOriginX().isFixed() && style.transformOriginX().value())
|| (style.transformOriginY().isFixed() && style.transformOriginY().value());
}
bool RenderLayerBacking::updateCompositedBounds()
{
#if USE(OWNING_LAYER_BEAR_TRAP)
RELEASE_ASSERT_WITH_MESSAGE(m_owningLayerBearTrap == BEAR_TRAP_VALUE, "RenderLayerBacking::updateCompositedBounds(): m_owningLayerBearTrap caught the bear (55699292)");
RELEASE_ASSERT_WITH_MESSAGE(&m_owningLayer, "RenderLayerBacking::updateCompositedBounds(): m_owningLayer is null (55699292)");
#endif
LayoutRect layerBounds = m_owningLayer.calculateLayerBounds(&m_owningLayer, { }, RenderLayer::defaultCalculateLayerBoundsFlags() | RenderLayer::ExcludeHiddenDescendants | RenderLayer::DontConstrainForMask);
// Clip to the size of the document or enclosing overflow-scroll layer.
// If this or an ancestor is transformed, we can't currently compute the correct rect to intersect with.
// We'd need RenderObject::convertContainerToLocalQuad(), which doesn't yet exist.
if (shouldClipCompositedBounds()) {
auto& view = renderer().view();
auto* rootLayer = view.layer();
LayoutRect clippingBounds;
if (renderer().isFixedPositioned() && renderer().container() == &view)
clippingBounds = view.frameView().rectForFixedPositionLayout();
else
clippingBounds = view.unscaledDocumentRect();
if (&m_owningLayer != rootLayer)
clippingBounds.intersect(m_owningLayer.backgroundClipRect(RenderLayer::ClipRectsContext(rootLayer, AbsoluteClipRects)).rect()); // FIXME: Incorrect for CSS regions.
LayoutPoint delta = m_owningLayer.convertToLayerCoords(rootLayer, LayoutPoint(), RenderLayer::AdjustForColumns);
clippingBounds.move(-delta.x(), -delta.y());
layerBounds.intersect(clippingBounds);
}
// If the backing provider has overflow:clip, we know all sharing layers are affected by the clip because they are containing-block descendants.
if (!renderer().hasNonVisibleOverflow()) {
for (auto& layerWeakPtr : m_backingSharingLayers) {
auto* boundsRootLayer = &m_owningLayer;
ASSERT(layerWeakPtr->isDescendantOf(m_owningLayer));
auto offset = layerWeakPtr->offsetFromAncestor(&m_owningLayer);
auto bounds = layerWeakPtr->calculateLayerBounds(boundsRootLayer, offset, RenderLayer::defaultCalculateLayerBoundsFlags() | RenderLayer::ExcludeHiddenDescendants | RenderLayer::DontConstrainForMask);
layerBounds.unite(bounds);
}
}
// If the element has a transform-origin that has fixed lengths, and the renderer has zero size,
// then we need to ensure that the compositing layer has non-zero size so that we can apply
// the transform-origin via the GraphicsLayer anchorPoint (which is expressed as a fractional value).
if (layerBounds.isEmpty() && (hasNonZeroTransformOrigin(renderer()) || renderer().style().hasPerspective())) {
layerBounds.setWidth(1);
layerBounds.setHeight(1);
m_artificiallyInflatedBounds = true;
} else
m_artificiallyInflatedBounds = false;
return setCompositedBounds(layerBounds);
}
void RenderLayerBacking::updateAllowsBackingStoreDetaching(const LayoutRect& absoluteBounds)
{
auto setAllowsBackingStoreDetaching = [&](bool allowDetaching) {
m_graphicsLayer->setAllowsBackingStoreDetaching(allowDetaching);
if (m_foregroundLayer)
m_foregroundLayer->setAllowsBackingStoreDetaching(allowDetaching);
if (m_backgroundLayer)
m_backgroundLayer->setAllowsBackingStoreDetaching(allowDetaching);
if (m_scrolledContentsLayer)
m_scrolledContentsLayer->setAllowsBackingStoreDetaching(allowDetaching);
};
if (!m_owningLayer.behavesAsFixed()) {
setAllowsBackingStoreDetaching(true);
return;
}
// We'll allow detaching if the layer is outside the layout viewport. Fixed layers inside
// the layout viewport can be revealed by async scrolling, so we want to pin their backing store.
FrameView& frameView = renderer().view().frameView();
LayoutRect fixedLayoutRect;
if (frameView.useFixedLayout())
fixedLayoutRect = renderer().view().unscaledDocumentRect();
else
fixedLayoutRect = frameView.rectForFixedPositionLayout();
bool allowDetaching = !fixedLayoutRect.intersects(absoluteBounds);
LOG_WITH_STREAM(Compositing, stream << "RenderLayerBacking (layer " << &m_owningLayer << ") updateAllowsBackingStoreDetaching - absoluteBounds " << absoluteBounds << " layoutViewportRect " << fixedLayoutRect << ", allowDetaching " << allowDetaching);
setAllowsBackingStoreDetaching(allowDetaching);
}
void RenderLayerBacking::updateAfterWidgetResize()
{
if (!is<RenderWidget>(renderer()))
return;
if (auto* innerCompositor = RenderLayerCompositor::frameContentsCompositor(downcast<RenderWidget>(renderer()))) {
innerCompositor->frameViewDidChangeSize();
innerCompositor->frameViewDidChangeLocation(flooredIntPoint(contentsBox().location()));
}
}
void RenderLayerBacking::updateAfterLayout(bool needsClippingUpdate, bool needsFullRepaint)
{
#if USE(OWNING_LAYER_BEAR_TRAP)
RELEASE_ASSERT_WITH_MESSAGE(m_owningLayerBearTrap == BEAR_TRAP_VALUE, "RenderLayerBacking::updateAfterLayout(): m_owningLayerBearTrap caught the bear (55699292)");
RELEASE_ASSERT_WITH_MESSAGE(&m_owningLayer, "RenderLayerBacking::updateAfterLayout(): m_owningLayer is null (55699292)");
#endif
LOG_WITH_STREAM(Compositing, stream << "RenderLayerBacking::updateAfterLayout (layer " << &m_owningLayer << " needsClippingUpdate " << needsClippingUpdate << " needsFullRepaint " << needsFullRepaint);
// This is the main trigger for layout changing layer geometry, but we have to do the work again in updateBackingAndHierarchy()
// when we know the final compositing hierarchy. We can't just set dirty bits from RenderLayer::setSize() because that doesn't
// take overflow into account.
if (updateCompositedBounds()) {
m_owningLayer.setNeedsCompositingGeometryUpdate();
// This layer's geometry affects those of its children.
m_owningLayer.setChildrenNeedCompositingGeometryUpdate();
} else if (needsClippingUpdate) {
m_owningLayer.setNeedsCompositingConfigurationUpdate();
m_owningLayer.setNeedsCompositingGeometryUpdate();
}
if (needsFullRepaint && canIssueSetNeedsDisplay())
setContentsNeedDisplay();
}
// This can only update things that don't require up-to-date layout.
void RenderLayerBacking::updateConfigurationAfterStyleChange()
{
updateMaskingLayer(renderer().hasMask(), renderer().hasClipPath());
if (m_owningLayer.hasReflection()) {
if (m_owningLayer.reflectionLayer()->backing()) {
auto* reflectionLayer = m_owningLayer.reflectionLayer()->backing()->graphicsLayer();
m_graphicsLayer->setReplicatedByLayer(reflectionLayer);
}
} else
m_graphicsLayer->setReplicatedByLayer(nullptr);
// FIXME: do we care if opacity is animating?
auto& style = renderer().style();
updateOpacity(style);
updateFilters(style);
#if ENABLE(FILTERS_LEVEL_2)
updateBackdropFilters(style);
#endif
#if ENABLE(CSS_COMPOSITING)
updateBlendMode(style);
#endif
updateContentsScalingFilters(style);
}
bool RenderLayerBacking::updateConfiguration(const RenderLayer* compositingAncestor)
{
ASSERT(!m_owningLayer.normalFlowListDirty());
ASSERT(!m_owningLayer.zOrderListsDirty());
ASSERT(!renderer().view().needsLayout());
bool layerConfigChanged = false;
auto& compositor = this->compositor();
setBackgroundLayerPaintsFixedRootBackground(compositor.needsFixedRootBackgroundLayer(m_owningLayer));
if (updateBackgroundLayer(m_backgroundLayerPaintsFixedRootBackground || m_requiresBackgroundLayer))
layerConfigChanged = true;