/
RenderLayerBacking.cpp
3068 lines (2531 loc) · 127 KB
/
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 "CSSAnimationController.h"
#include "CanvasRenderingContext.h"
#include "CSSPropertyNames.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "FilterEffectRenderer.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "GraphicsLayer.h"
#include "HTMLBodyElement.h"
#include "HTMLCanvasElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLMediaElement.h"
#include "HTMLNames.h"
#include "HTMLPlugInElement.h"
#include "InspectorInstrumentation.h"
#include "KeyframeList.h"
#include "Logging.h"
#include "MainFrame.h"
#include "Page.h"
#include "PerformanceLoggingClient.h"
#include "PluginViewBase.h"
#include "ProgressTracker.h"
#include "RenderFlowThread.h"
#include "RenderHTMLCanvas.h"
#include "RenderIFrame.h"
#include "RenderImage.h"
#include "RenderLayerCompositor.h"
#include "RenderEmbeddedObject.h"
#include "RenderMedia.h"
#include "RenderNamedFlowFragment.h"
#include "RenderRegion.h"
#include "RenderVideo.h"
#include "RenderView.h"
#include "ScrollingCoordinator.h"
#include "Settings.h"
#include "StyleResolver.h"
#include "TiledBacking.h"
#include <wtf/text/TextStream.h>
#if PLATFORM(IOS)
#include "RuntimeApplicationChecks.h"
#endif
namespace WebCore {
using namespace HTMLNames;
CanvasCompositingStrategy canvasCompositingStrategy(const RenderObject& renderer)
{
ASSERT(renderer.isCanvas());
const HTMLCanvasElement* canvas = downcast<HTMLCanvasElement>(renderer.node());
CanvasRenderingContext* context = canvas->renderingContext();
if (!context || !context->isAccelerated())
return UnacceleratedCanvas;
if (context->isGPUBased())
return CanvasAsLayerContents;
#if ENABLE(ACCELERATED_2D_CANVAS)
return CanvasAsLayerContents;
#else
return CanvasPaintedToLayer; // On Mac and iOS we paint accelerated canvases into their layers.
#endif
}
// 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.isRootLayer()) {
m_isMainFrameRenderViewLayer = renderer().frame().isMainFrame();
m_isMainFrameLayerWithTiledBacking = renderer().page().chrome().client().shouldUseTiledBackingForFrameView(renderer().view().frameView());
}
createPrimaryGraphicsLayer();
if (TiledBacking* tiledBacking = this->tiledBacking()) {
tiledBacking->setIsInWindow(renderer().page().isInWindow());
if (m_isMainFrameLayerWithTiledBacking) {
tiledBacking->setScrollingPerformanceLoggingEnabled(renderer().settings().scrollingPerformanceLoggingEnabled());
adjustTiledBackingCoverage();
}
}
}
RenderLayerBacking::~RenderLayerBacking()
{
updateAncestorClippingLayer(false);
updateChildClippingStrategy(false);
updateDescendantClippingLayer(false);
updateOverflowControlsLayers(false, false, false);
updateForegroundLayer(false);
updateBackgroundLayer(false);
updateMaskingLayer(false, false);
updateScrollingLayers(false);
detachFromScrollingCoordinator(Scrolling | ViewportConstrained);
destroyGraphicsLayers();
}
void RenderLayerBacking::willDestroyLayer(const GraphicsLayer* layer)
{
if (layer && layer->type() == GraphicsLayer::Type::Normal && layer->tiledBacking())
compositor().layerTiledBackingUsageChanged(layer, false);
}
std::unique_ptr<GraphicsLayer> RenderLayerBacking::createGraphicsLayer(const String& name, GraphicsLayer::Type layerType)
{
auto* graphicsLayerFactory = renderer().page().chrome().client().graphicsLayerFactory();
std::unique_ptr<GraphicsLayer> 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(DisplayList::AsTextFlags flags) const
{
return m_graphicsLayer->displayListAsText(flags);
}
void RenderLayerBacking::setIsTrackingDisplayListReplay(bool isTrackingReplay)
{
m_graphicsLayer->setIsTrackingDisplayListReplay(isTrackingReplay);
}
String RenderLayerBacking::replayDisplayListAsText(DisplayList::AsTextFlags 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(RenderLayerBacking* backing)
{
// FIXME: When we use TiledBacking for overflow, this should look at RenderView scrollability.
FrameView& frameView = backing->owningLayer().renderer().view().frameView();
// If the page is non-visible, don't incur the cost of keeping extra tiles for scrolling.
if (!backing->owningLayer().page().isVisible())
return TiledBacking::CoverageForVisibleArea;
TiledBacking::TileCoverage tileCoverage = TiledBacking::CoverageForVisibleArea;
bool useMinimalTilesDuringLiveResize = frameView.inLiveResize();
if (frameView.speculativeTilingEnabled() && !useMinimalTilesDuringLiveResize) {
bool clipsToExposedRect = static_cast<bool>(frameView.viewExposedRect());
if (frameView.horizontalScrollbarMode() != ScrollbarAlwaysOff || clipsToExposedRect)
tileCoverage |= TiledBacking::CoverageForHorizontalScrolling;
if (frameView.verticalScrollbarMode() != ScrollbarAlwaysOff || clipsToExposedRect)
tileCoverage |= TiledBacking::CoverageForVerticalScrolling;
}
return tileCoverage;
}
void RenderLayerBacking::adjustTiledBackingCoverage()
{
if (!m_isMainFrameLayerWithTiledBacking)
return;
TiledBacking::TileCoverage tileCoverage = computePageTiledBackingCoverage(this);
tiledBacking()->setTileCoverage(tileCoverage);
}
void RenderLayerBacking::setTiledBackingHasMargins(bool hasExtendedBackgroundOnLeftAndRight, bool hasExtendedBackgroundOnTopAndBottom)
{
if (!m_isMainFrameLayerWithTiledBacking)
return;
tiledBacking()->setHasMargins(hasExtendedBackgroundOnTopAndBottom, hasExtendedBackgroundOnTopAndBottom, hasExtendedBackgroundOnLeftAndRight, hasExtendedBackgroundOnLeftAndRight);
}
void RenderLayerBacking::updateDebugIndicators(bool showBorder, bool showRepaintCounter)
{
m_graphicsLayer->setShowDebugBorder(showBorder);
m_graphicsLayer->setShowRepaintCounter(showRepaintCounter);
if (m_ancestorClippingLayer)
m_ancestorClippingLayer->setShowDebugBorder(showBorder);
if (m_foregroundLayer) {
m_foregroundLayer->setShowDebugBorder(showBorder);
m_foregroundLayer->setShowRepaintCounter(showRepaintCounter);
}
if (m_contentsContainmentLayer)
m_contentsContainmentLayer->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_scrollingLayer)
m_scrollingLayer->setShowDebugBorder(showBorder);
if (m_scrollingContentsLayer) {
m_scrollingContentsLayer->setShowDebugBorder(showBorder);
m_scrollingContentsLayer->setShowRepaintCounter(showRepaintCounter);
}
}
void RenderLayerBacking::createPrimaryGraphicsLayer()
{
String layerName = m_owningLayer.name();
const unsigned maxLayerNameLength = 100;
if (layerName.length() > maxLayerNameLength) {
layerName.truncate(maxLayerNameLength);
layerName.append("...");
}
m_graphicsLayer = createGraphicsLayer(layerName, m_isMainFrameLayerWithTiledBacking ? GraphicsLayer::Type::PageTiledBacking : GraphicsLayer::Type::Normal);
if (m_isMainFrameLayerWithTiledBacking) {
m_childContainmentLayer = createGraphicsLayer("Page TiledBacking containment");
m_graphicsLayer->addChild(m_childContainmentLayer.get());
}
#if !PLATFORM(IOS)
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
updateOpacity(renderer().style());
updateTransform(renderer().style());
updateFilters(renderer().style());
#if ENABLE(FILTERS_LEVEL_2)
updateBackdropFilters(renderer().style());
#endif
#if ENABLE(CSS_COMPOSITING)
updateBlendMode(renderer().style());
#endif
updateCustomAppearance(renderer().style());
}
#if PLATFORM(IOS)
void RenderLayerBacking::layerWillBeDestroyed()
{
RenderObject& renderer = this->renderer();
if (is<RenderEmbeddedObject>(renderer) && downcast<RenderEmbeddedObject>(renderer).allowsAcceleratedCompositing()) {
PluginViewBase* 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) {
willDestroyLayer(m_graphicsLayer.get());
m_graphicsLayer->removeFromParent();
}
m_ancestorClippingLayer = nullptr;
m_contentsContainmentLayer = nullptr;
m_graphicsLayer = nullptr;
m_foregroundLayer = nullptr;
m_backgroundLayer = nullptr;
m_childContainmentLayer = nullptr;
m_maskLayer = nullptr;
m_childClippingMaskLayer = nullptr;
m_scrollingLayer = nullptr;
m_scrollingContentsLayer = nullptr;
}
void RenderLayerBacking::updateOpacity(const RenderStyle& style)
{
m_graphicsLayer->setOpacity(compositingOpacity(style.opacity()));
}
void RenderLayerBacking::updateTransform(const RenderStyle& style)
{
// FIXME: This could use m_owningLayer.transform(), but that currently has transform-origin
// baked into it, and we don't want that.
TransformationMatrix t;
if (m_owningLayer.hasTransform()) {
auto& renderBox = downcast<RenderBox>(renderer());
style.applyTransform(t, snapRectToDevicePixels(renderBox.borderBoxRect(), deviceScaleFactor()), RenderStyle::ExcludeTransformOrigin);
makeMatrixRenderable(t, compositor().canRender3DTransforms());
}
if (m_contentsContainmentLayer) {
m_contentsContainmentLayer->setTransform(t);
m_graphicsLayer->setTransform(TransformationMatrix());
} else
m_graphicsLayer->setTransform(t);
}
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;
RenderBox& renderer = downcast<RenderBox>(this->renderer());
LayoutRect boxRect = renderer.borderBoxRect();
if (renderer.hasClip())
boxRect.intersect(renderer.clipRect(LayoutPoint(), nullptr));
boxRect.move(contentOffsetInCompostingLayer());
FloatRoundedRect backdropFiltersRect;
if (renderer.style().hasBorderRadius() && !renderer.hasClip())
backdropFiltersRect = renderer.style().getRoundedInnerBorderFor(boxRect).pixelSnappedRoundedRectForPainting(deviceScaleFactor());
else
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_ancestorClippingLayers come and go?
if (m_ancestorClippingLayer) {
m_ancestorClippingLayer->setBlendMode(style.blendMode());
m_graphicsLayer->setBlendMode(BlendModeNormal);
} else
m_graphicsLayer->setBlendMode(style.blendMode());
}
#endif
void RenderLayerBacking::updateCustomAppearance(const RenderStyle& style)
{
ControlPart appearance = style.appearance();
if (appearance == MediaControlsLightBarBackgroundPart)
m_graphicsLayer->setCustomAppearance(GraphicsLayer::LightBackdropAppearance);
else if (appearance == MediaControlsDarkBarBackgroundPart)
m_graphicsLayer->setCustomAppearance(GraphicsLayer::DarkBackdropAppearance);
else
m_graphicsLayer->setCustomAppearance(GraphicsLayer::NoCustomAppearance);
}
static bool layerOrAncestorIsTransformedOrUsingCompositedScrolling(RenderLayer& layer)
{
for (RenderLayer* curr = &layer; curr; curr = curr->parent()) {
if (curr->hasTransform() || curr->usesAcceleratedScrolling())
return true;
}
return false;
}
bool RenderLayerBacking::shouldClipCompositedBounds() const
{
#if !PLATFORM(IOS)
// Scrollbar layers use this layer for relative positioning, so don't clip.
if (layerForHorizontalScrollbar() || layerForVerticalScrollbar())
return false;
#endif
if (m_isMainFrameLayerWithTiledBacking)
return false;
if (layerOrAncestorIsTransformedOrUsingCompositedScrolling(m_owningLayer))
return false;
if (m_owningLayer.isFlowThreadCollectingGraphicsLayersUnderRegions())
return false;
return true;
}
static bool hasNonZeroTransformOrigin(const RenderObject& renderer)
{
const RenderStyle& style = renderer.style();
return (style.transformOriginX().type() == Fixed && style.transformOriginX().value())
|| (style.transformOriginY().type() == Fixed && style.transformOriginY().value());
}
void RenderLayerBacking::updateCompositedBounds()
{
LayoutRect layerBounds = m_owningLayer.calculateLayerBounds(&m_owningLayer, LayoutSize(), 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()) {
RenderView& view = renderer().view();
RenderLayer* rootLayer = view.layer();
LayoutRect clippingBounds;
if (renderer().style().position() == FixedPosition && 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 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;
setCompositedBounds(layerBounds);
}
void RenderLayerBacking::updateAfterWidgetResize()
{
if (!is<RenderWidget>(renderer()))
return;
if (RenderLayerCompositor* innerCompositor = RenderLayerCompositor::frameContentsCompositor(&downcast<RenderWidget>(renderer()))) {
innerCompositor->frameViewDidChangeSize();
innerCompositor->frameViewDidChangeLocation(flooredIntPoint(contentsBox().location()));
}
}
void RenderLayerBacking::updateAfterLayout(UpdateAfterLayoutFlags flags)
{
LOG(Compositing, "RenderLayerBacking %p updateAfterLayout (layer %p)", this, &m_owningLayer);
if (!compositor().compositingLayersNeedRebuild()) {
// Calling updateGeometry() here gives incorrect results, because the
// position of this layer's GraphicsLayer depends on the position of our compositing
// ancestor's GraphicsLayer. That cannot be determined until all the descendant
// RenderLayers of that ancestor have been processed via updateLayerPositions().
//
// The solution is to update compositing children of this layer here,
// via updateCompositingChildrenGeometry().
updateCompositedBounds();
compositor().updateCompositingDescendantGeometry(m_owningLayer, m_owningLayer, flags & CompositingChildrenOnly);
if (flags & IsUpdateRoot) {
updateGeometry();
compositor().updateRootLayerPosition();
RenderLayer* stackingContainer = m_owningLayer.enclosingStackingContainer();
if (!compositor().compositingLayersNeedRebuild() && stackingContainer && (stackingContainer != &m_owningLayer))
compositor().updateCompositingDescendantGeometry(*stackingContainer, *stackingContainer, flags & CompositingChildrenOnly);
}
}
if (flags & NeedsFullRepaint && canIssueSetNeedsDisplay())
setContentsNeedDisplay();
}
bool RenderLayerBacking::updateConfiguration()
{
m_owningLayer.updateDescendantDependentFlags();
m_owningLayer.updateZOrderLists();
bool layerConfigChanged = false;
setBackgroundLayerPaintsFixedRootBackground(compositor().needsFixedRootBackgroundLayer(m_owningLayer));
// The background layer is currently only used for fixed root backgrounds.
if (updateBackgroundLayer(m_backgroundLayerPaintsFixedRootBackground))
layerConfigChanged = true;
if (updateForegroundLayer(compositor().needsContentsCompositingLayer(m_owningLayer)))
layerConfigChanged = true;
bool needsDescendantsClippingLayer = compositor().clipsCompositingDescendants(m_owningLayer);
if (!renderer().view().needsLayout()) {
bool usesCompositedScrolling = m_owningLayer.usesAcceleratedScrolling();
// Our scrolling layer will clip.
if (usesCompositedScrolling)
needsDescendantsClippingLayer = false;
if (updateScrollingLayers(usesCompositedScrolling))
layerConfigChanged = true;
if (updateDescendantClippingLayer(needsDescendantsClippingLayer))
layerConfigChanged = true;
}
if (updateAncestorClippingLayer(compositor().clippedByAncestor(m_owningLayer)))
layerConfigChanged = true;
if (updateOverflowControlsLayers(requiresHorizontalScrollbarLayer(), requiresVerticalScrollbarLayer(), requiresScrollCornerLayer()))
layerConfigChanged = true;
if (layerConfigChanged)
updateInternalHierarchy();
if (GraphicsLayer* flatteningLayer = tileCacheFlatteningLayer()) {
if (layerConfigChanged || flatteningLayer->parent() != m_graphicsLayer.get())
m_graphicsLayer->addChild(flatteningLayer);
}
updateMaskingLayer(renderer().hasMask(), renderer().hasClipPath());
updateChildClippingStrategy(needsDescendantsClippingLayer);
if (m_owningLayer.hasReflection()) {
if (m_owningLayer.reflectionLayer()->backing()) {
GraphicsLayer* reflectionLayer = m_owningLayer.reflectionLayer()->backing()->graphicsLayer();
m_graphicsLayer->setReplicatedByLayer(reflectionLayer);
}
} else
m_graphicsLayer->setReplicatedByLayer(nullptr);
PaintedContentsInfo contentsInfo(*this);
if (!m_owningLayer.isRootLayer()) {
bool didUpdateContentsRect = false;
updateDirectlyCompositedBoxDecorations(contentsInfo, didUpdateContentsRect);
} else
updateRootLayerConfiguration();
if (contentsInfo.isDirectlyCompositedImage())
updateImageContents(contentsInfo);
if (is<RenderEmbeddedObject>(renderer()) && downcast<RenderEmbeddedObject>(renderer()).allowsAcceleratedCompositing()) {
PluginViewBase* pluginViewBase = downcast<PluginViewBase>(downcast<RenderWidget>(renderer()).widget());
#if PLATFORM(IOS)
if (pluginViewBase && !m_graphicsLayer->contentsLayerForMedia()) {
pluginViewBase->detachPluginLayer();
pluginViewBase->attachPluginLayer();
}
#else
if (!pluginViewBase->shouldNotAddLayer())
m_graphicsLayer->setContentsToPlatformLayer(pluginViewBase->platformLayer(), GraphicsLayer::ContentsLayerForPlugin);
#endif
}
#if ENABLE(VIDEO)
else if (is<RenderVideo>(renderer()) && downcast<RenderVideo>(renderer()).shouldDisplayVideo()) {
HTMLMediaElement* mediaElement = downcast<HTMLMediaElement>(renderer().element());
m_graphicsLayer->setContentsToPlatformLayer(mediaElement->platformLayer(), GraphicsLayer::ContentsLayerForMedia);
}
#endif
#if ENABLE(WEBGL) || ENABLE(ACCELERATED_2D_CANVAS)
else if (renderer().isCanvas() && canvasCompositingStrategy(renderer()) == CanvasAsLayerContents) {
const HTMLCanvasElement* canvas = downcast<HTMLCanvasElement>(renderer().element());
if (CanvasRenderingContext* context = canvas->renderingContext())
m_graphicsLayer->setContentsToPlatformLayer(context->platformLayer(), GraphicsLayer::ContentsLayerForCanvas);
layerConfigChanged = true;
}
#endif
if (is<RenderWidget>(renderer()))
layerConfigChanged = RenderLayerCompositor::parentFrameContentLayers(&downcast<RenderWidget>(renderer()));
return layerConfigChanged;
}
static LayoutRect clipBox(RenderBox& renderer)
{
LayoutRect result = LayoutRect::infiniteRect();
if (renderer.hasOverflowClip())
result = renderer.overflowClipRect(LayoutPoint(), 0); // FIXME: Incorrect for CSS regions.
if (renderer.hasClip())
result.intersect(renderer.clipRect(LayoutPoint(), 0)); // FIXME: Incorrect for CSS regions.
return result;
}
static bool subpixelOffsetFromRendererChanged(const LayoutSize& oldSubpixelOffsetFromRenderer, const LayoutSize& newSubpixelOffsetFromRenderer, float deviceScaleFactor)
{
FloatSize previous = snapSizeToDevicePixel(oldSubpixelOffsetFromRenderer, LayoutPoint(), deviceScaleFactor);
FloatSize current = snapSizeToDevicePixel(newSubpixelOffsetFromRenderer, LayoutPoint(), deviceScaleFactor);
return previous != current;
}
static FloatSize subpixelForLayerPainting(const LayoutPoint& point, float pixelSnappingFactor)
{
LayoutUnit x = point.x();
LayoutUnit y = point.y();
x = x >= 0 ? floorToDevicePixel(x, pixelSnappingFactor) : ceilToDevicePixel(x, pixelSnappingFactor);
y = y >= 0 ? floorToDevicePixel(y, pixelSnappingFactor) : ceilToDevicePixel(y, pixelSnappingFactor);
return point - LayoutPoint(x, y);
}
struct OffsetFromRenderer {
// 1.2px - > { m_devicePixelOffset = 1px m_subpixelOffset = 0.2px }
LayoutSize m_devicePixelOffset;
LayoutSize m_subpixelOffset;
};
static OffsetFromRenderer computeOffsetFromRenderer(const LayoutSize& offset, float deviceScaleFactor)
{
OffsetFromRenderer offsetFromRenderer;
offsetFromRenderer.m_subpixelOffset = LayoutSize(subpixelForLayerPainting(toLayoutPoint(offset), deviceScaleFactor));
offsetFromRenderer.m_devicePixelOffset = offset - offsetFromRenderer.m_subpixelOffset;
return offsetFromRenderer;
}
struct SnappedRectInfo {
LayoutRect m_snappedRect;
LayoutSize m_snapDelta;
};
static SnappedRectInfo snappedGraphicsLayer(const LayoutSize& offset, const LayoutSize& size, float deviceScaleFactor)
{
SnappedRectInfo snappedGraphicsLayer;
LayoutRect graphicsLayerRect = LayoutRect(toLayoutPoint(offset), size);
snappedGraphicsLayer.m_snappedRect = LayoutRect(snapRectToDevicePixels(graphicsLayerRect, deviceScaleFactor));
snappedGraphicsLayer.m_snapDelta = snappedGraphicsLayer.m_snappedRect.location() - toLayoutPoint(offset);
return snappedGraphicsLayer;
}
static LayoutSize computeOffsetFromAncestorGraphicsLayer(RenderLayer* compositedAncestor, const LayoutPoint& location, float deviceScaleFactor)
{
if (!compositedAncestor)
return toLayoutSize(location);
// FIXME: This is a workaround until after webkit.org/162634 gets fixed. ancestorSubpixelOffsetFromRenderer
// could be stale when a dynamic composited state change triggers a pre-order updateGeometry() traversal.
LayoutSize ancestorSubpixelOffsetFromRenderer = compositedAncestor->backing()->subpixelOffsetFromRenderer();
LayoutRect ancestorCompositedBounds = compositedAncestor->backing()->compositedBounds();
LayoutSize floored = toLayoutSize(LayoutPoint(floorPointToDevicePixels(ancestorCompositedBounds.location() - ancestorSubpixelOffsetFromRenderer, deviceScaleFactor)));
LayoutSize ancestorRendererOffsetFromAncestorGraphicsLayer = -(floored + ancestorSubpixelOffsetFromRenderer);
return ancestorRendererOffsetFromAncestorGraphicsLayer + toLayoutSize(location);
}
class ComputedOffsets {
public:
ComputedOffsets(const RenderLayer& renderLayer, const LayoutRect& localRect, const LayoutRect& parentGraphicsLayerRect, const LayoutRect& primaryGraphicsLayerRect)
: m_renderLayer(renderLayer)
, m_location(localRect.location())
, m_parentGraphicsLayerOffset(toLayoutSize(parentGraphicsLayerRect.location()))
, m_primaryGraphicsLayerOffset(toLayoutSize(primaryGraphicsLayerRect.location()))
, m_deviceScaleFactor(renderLayer.renderer().document().deviceScaleFactor())
{
}
LayoutSize fromParentGraphicsLayer()
{
if (!m_fromParentGraphicsLayer)
m_fromParentGraphicsLayer = fromAncestorGraphicsLayer() - m_parentGraphicsLayerOffset;
return m_fromParentGraphicsLayer.value();
}
LayoutSize fromPrimaryGraphicsLayer()
{
if (!m_fromPrimaryGraphicsLayer)
m_fromPrimaryGraphicsLayer = fromAncestorGraphicsLayer() - m_parentGraphicsLayerOffset - m_primaryGraphicsLayerOffset;
return m_fromPrimaryGraphicsLayer.value();
}
private:
LayoutSize fromAncestorGraphicsLayer()
{
if (!m_fromAncestorGraphicsLayer) {
RenderLayer* compositedAncestor = m_renderLayer.ancestorCompositingLayer();
LayoutPoint localPointInAncestorRenderLayerCoords = m_renderLayer.convertToLayerCoords(compositedAncestor, m_location, RenderLayer::AdjustForColumns);
m_fromAncestorGraphicsLayer = computeOffsetFromAncestorGraphicsLayer(compositedAncestor, localPointInAncestorRenderLayerCoords, m_deviceScaleFactor);
}
return m_fromAncestorGraphicsLayer.value();
}
std::optional<LayoutSize> m_fromAncestorGraphicsLayer;
std::optional<LayoutSize> m_fromParentGraphicsLayer;
std::optional<LayoutSize> m_fromPrimaryGraphicsLayer;
const RenderLayer& m_renderLayer;
// Location is relative to the renderer.
const LayoutPoint m_location;
const LayoutSize m_parentGraphicsLayerOffset;
const LayoutSize m_primaryGraphicsLayerOffset;
float m_deviceScaleFactor;
};
LayoutRect RenderLayerBacking::computePrimaryGraphicsLayerRect(const LayoutRect& parentGraphicsLayerRect) const
{
ComputedOffsets compositedBoundsOffset(m_owningLayer, compositedBounds(), parentGraphicsLayerRect, LayoutRect());
return LayoutRect(encloseRectToDevicePixels(LayoutRect(toLayoutPoint(compositedBoundsOffset.fromParentGraphicsLayer()), compositedBounds().size()),
deviceScaleFactor()));
}
LayoutRect RenderLayerBacking::computeParentGraphicsLayerRect(RenderLayer* compositedAncestor, LayoutSize& ancestorClippingLayerOffset) const
{
if (!compositedAncestor || !compositedAncestor->backing())
return renderer().view().documentRect();
auto* ancestorBackingLayer = compositedAncestor->backing();
LayoutRect parentGraphicsLayerRect;
if (m_owningLayer.isInsideFlowThread()) {
// FIXME: flows/columns need work.
LayoutRect ancestorCompositedBounds = ancestorBackingLayer->compositedBounds();
ancestorCompositedBounds.setLocation(LayoutPoint());
adjustAncestorCompositingBoundsForFlowThread(ancestorCompositedBounds, compositedAncestor);
parentGraphicsLayerRect = ancestorCompositedBounds;
}
if (ancestorBackingLayer->hasClippingLayer()) {
// If the compositing ancestor has a layer to clip children, we parent in that, and therefore position relative to it.
LayoutRect clippingBox = clipBox(downcast<RenderBox>(compositedAncestor->renderer()));
LayoutSize clippingBoxOffset = computeOffsetFromAncestorGraphicsLayer(compositedAncestor, clippingBox.location(), deviceScaleFactor());
parentGraphicsLayerRect = snappedGraphicsLayer(clippingBoxOffset, clippingBox.size(), deviceScaleFactor()).m_snappedRect;
}
#if PLATFORM(IOS)
if (compositedAncestor->hasTouchScrollableOverflow()) {
LayoutRect ancestorCompositedBounds = ancestorBackingLayer->compositedBounds();
auto& renderBox = downcast<RenderBox>(compositedAncestor->renderer());
LayoutRect paddingBox(renderBox.borderLeft(), renderBox.borderTop(), renderBox.width() - renderBox.borderLeft() - renderBox.borderRight(), renderBox.height() - renderBox.borderTop() - renderBox.borderBottom());
ScrollOffset scrollOffset = compositedAncestor->scrollOffset();
parentGraphicsLayerRect = LayoutRect((paddingBox.location() - toLayoutSize(ancestorCompositedBounds.location()) - toLayoutSize(scrollOffset)), paddingBox.size());
}
#else
if (compositedAncestor->needsCompositedScrolling()) {
auto& renderBox = downcast<RenderBox>(compositedAncestor->renderer());
LayoutPoint scrollOrigin(renderBox.borderLeft(), renderBox.borderTop());
parentGraphicsLayerRect = LayoutRect(scrollOrigin - toLayoutSize(compositedAncestor->scrollOffset()), renderBox.borderBoxRect().size());
}
#endif
if (m_ancestorClippingLayer) {
// Call calculateRects to get the backgroundRect which is what is used to clip the contents of this
// layer. Note that we call it with temporaryClipRects = true because normally when computing clip rects
// for a compositing layer, rootLayer is the layer itself.
ShouldRespectOverflowClip shouldRespectOverflowClip = compositedAncestor->isolatesCompositedBlending() ? RespectOverflowClip : IgnoreOverflowClip;
RenderLayer::ClipRectsContext clipRectsContext(compositedAncestor, TemporaryClipRects, IgnoreOverlayScrollbarSize, shouldRespectOverflowClip);
LayoutRect parentClipRect = m_owningLayer.backgroundClipRect(clipRectsContext).rect(); // FIXME: Incorrect for CSS regions.
ASSERT(!parentClipRect.isInfinite());
LayoutSize clippingOffset = computeOffsetFromAncestorGraphicsLayer(compositedAncestor, parentClipRect.location(), deviceScaleFactor());
LayoutRect snappedClippingLayerRect = snappedGraphicsLayer(clippingOffset, parentClipRect.size(), deviceScaleFactor()).m_snappedRect;
// The primary layer is then parented in, and positioned relative to this clipping layer.
ancestorClippingLayerOffset = snappedClippingLayerRect.location() - parentGraphicsLayerRect.location();
parentGraphicsLayerRect = snappedClippingLayerRect;
}
return parentGraphicsLayerRect;
}
void RenderLayerBacking::updateGeometry()
{
LOG_WITH_STREAM(Compositing, stream << "updateGeometry " << m_owningLayer);
// If we haven't built z-order lists yet, wait until later.
if (m_owningLayer.isStackingContainer() && m_owningLayer.m_zOrderListsDirty)
return;
const RenderStyle& style = renderer().style();
bool isRunningAcceleratedTransformAnimation = renderer().animation().isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyTransform, AnimationBase::Running | AnimationBase::Paused);
bool isRunningAcceleratedOpacityAnimation = renderer().animation().isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyOpacity, AnimationBase::Running | AnimationBase::Paused);
// Set transform property, if it is not animating. We have to do this here because the transform
// is affected by the layer dimensions.
if (!isRunningAcceleratedTransformAnimation)
updateTransform(style);
// Set opacity, if it is not animating.
if (!isRunningAcceleratedOpacityAnimation)
updateOpacity(style);
updateFilters(style);
#if ENABLE(FILTERS_LEVEL_2)
updateBackdropFilters(style);
#endif
#if ENABLE(CSS_COMPOSITING)
updateBlendMode(style);
#endif
m_owningLayer.updateDescendantDependentFlags();
// FIXME: reflections should force transform-style to be flat in the style: https://bugs.webkit.org/show_bug.cgi?id=106959
bool preserves3D = style.transformStyle3D() == TransformStyle3DPreserve3D && !renderer().hasReflection();
m_graphicsLayer->setPreserves3D(preserves3D);
m_graphicsLayer->setBackfaceVisibility(style.backfaceVisibility() == BackfaceVisibilityVisible);
RenderLayer* compositedAncestor = m_owningLayer.ancestorCompositingLayer();
LayoutSize ancestorClippingLayerOffset;
LayoutRect parentGraphicsLayerRect = computeParentGraphicsLayerRect(compositedAncestor, ancestorClippingLayerOffset);
LayoutRect primaryGraphicsLayerRect = computePrimaryGraphicsLayerRect(parentGraphicsLayerRect);
ComputedOffsets compositedBoundsOffset(m_owningLayer, compositedBounds(), parentGraphicsLayerRect, primaryGraphicsLayerRect);
m_compositedBoundsOffsetFromGraphicsLayer = compositedBoundsOffset.fromPrimaryGraphicsLayer();
m_graphicsLayer->setPosition(primaryGraphicsLayerRect.location());
m_graphicsLayer->setSize(primaryGraphicsLayerRect.size());
auto computeAnimationExtent = [&] () -> std::optional<FloatRect> {
LayoutRect animatedBounds;
if (isRunningAcceleratedTransformAnimation && m_owningLayer.getOverlapBoundsIncludingChildrenAccountingForTransformAnimations(animatedBounds))
return FloatRect(animatedBounds);
return { };
};
m_graphicsLayer->setAnimationExtent(computeAnimationExtent());
ComputedOffsets rendererOffset(m_owningLayer, LayoutRect(), parentGraphicsLayerRect, primaryGraphicsLayerRect);
if (m_ancestorClippingLayer) {
// Clipping layer is parented in the ancestor layer.