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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.
*/
#pragma once
#include "FloatPoint.h"
#include "FloatPoint3D.h"
#include "GraphicsLayer.h"
#include "GraphicsLayerClient.h"
#include "RenderLayer.h"
#include "RenderLayerCompositor.h"
#include "ScrollingCoordinator.h"
namespace WebCore {
class EventRegionContext;
class KeyframeList;
class PaintedContentsInfo;
class RenderLayerCompositor;
class TiledBacking;
class TransformationMatrix;
#if CPU(ADDRESS64) && PLATFORM(COCOA)
#define USE_OWNING_LAYER_BEAR_TRAP 1
#define BEAR_TRAP_VALUE 0xEEEEEEEEEEEEEEEE
#else
#define USE_OWNING_LAYER_BEAR_TRAP 0
#endif
enum CompositingLayerType {
NormalCompositingLayer, // non-tiled layer with backing store
TiledCompositingLayer, // tiled layer (always has backing store)
MediaCompositingLayer, // layer that contains an image, video, WebGL or plugin
ContainerCompositingLayer // layer with no backing store
};
// RenderLayerBacking controls the compositing behavior for a single RenderLayer.
// It holds the various GraphicsLayers, and makes decisions about intra-layer rendering
// optimizations.
//
// There is one RenderLayerBacking for each RenderLayer that is composited.
class RenderLayerBacking final : public GraphicsLayerClient {
WTF_MAKE_NONCOPYABLE(RenderLayerBacking); WTF_MAKE_FAST_ALLOCATED;
public:
explicit RenderLayerBacking(RenderLayer&);
~RenderLayerBacking();
#if PLATFORM(IOS_FAMILY)
void layerWillBeDestroyed();
#endif
// Do cleanup while layer->backing() is still valid.
void willBeDestroyed();
RenderLayer& owningLayer() const { return m_owningLayer; }
// Included layers are non-z-order descendant layers that are painted into this backing.
const Vector<WeakPtr<RenderLayer>>& backingSharingLayers() const { return m_backingSharingLayers; }
void setBackingSharingLayers(Vector<WeakPtr<RenderLayer>>&&);
bool hasBackingSharingLayers() const { return !m_backingSharingLayers.isEmpty(); }
void removeBackingSharingLayer(RenderLayer&);
void clearBackingSharingLayers();
void updateConfigurationAfterStyleChange();
// Returns true if layer configuration changed.
bool updateConfiguration(const RenderLayer* compositingAncestor);
// Update graphics layer position and bounds.
void updateGeometry(const RenderLayer* compositingAncestor);
// Update state the requires that descendant layers have been updated.
void updateAfterDescendants();
// Update contents and clipping structure.
void updateDrawsContent();
void updateAfterLayout(bool needsClippingUpdate, bool needsFullRepaint);
GraphicsLayer* graphicsLayer() const { return m_graphicsLayer.get(); }
// Layer to clip children
bool hasClippingLayer() const { return (m_childContainmentLayer && !m_isFrameLayerWithTiledBacking); }
GraphicsLayer* clippingLayer() const { return !m_isFrameLayerWithTiledBacking ? m_childContainmentLayer.get() : nullptr; }
bool hasAncestorClippingLayers() const { return !!m_ancestorClippingStack; }
LayerAncestorClippingStack* ancestorClippingStack() const { return m_ancestorClippingStack.get(); }
bool updateAncestorClippingStack(Vector<CompositedClipData>&&);
void ensureOverflowControlsHostLayerAncestorClippingStack(const RenderLayer* compositedAncestor);
LayerAncestorClippingStack* overflowControlsHostLayerAncestorClippingStack() const { return m_overflowControlsHostLayerAncestorClippingStack.get(); }
GraphicsLayer* contentsContainmentLayer() const { return m_contentsContainmentLayer.get(); }
GraphicsLayer* foregroundLayer() const { return m_foregroundLayer.get(); }
GraphicsLayer* backgroundLayer() const { return m_backgroundLayer.get(); }
bool backgroundLayerPaintsFixedRootBackground() const { return m_backgroundLayerPaintsFixedRootBackground; }
bool needsRepaintOnCompositedScroll() const;
bool requiresBackgroundLayer() const { return m_requiresBackgroundLayer; }
void setRequiresBackgroundLayer(bool);
bool hasScrollingLayer() const { return m_scrollContainerLayer != nullptr; }
GraphicsLayer* scrollContainerLayer() const { return m_scrollContainerLayer.get(); }
GraphicsLayer* scrolledContentsLayer() const { return m_scrolledContentsLayer.get(); }
void detachFromScrollingCoordinator(OptionSet<ScrollCoordinationRole>);
ScrollingNodeID scrollingNodeIDForRole(ScrollCoordinationRole role) const
{
switch (role) {
case ScrollCoordinationRole::Scrolling:
return m_scrollingNodeID;
case ScrollCoordinationRole::ScrollingProxy:
// These nodeIDs are stored in m_ancestorClippingStack.
ASSERT_NOT_REACHED();
return 0;
case ScrollCoordinationRole::FrameHosting:
return m_frameHostingNodeID;
case ScrollCoordinationRole::ViewportConstrained:
return m_viewportConstrainedNodeID;
case ScrollCoordinationRole::Positioning:
return m_positioningNodeID;
}
return 0;
}
void setScrollingNodeIDForRole(ScrollingNodeID, ScrollCoordinationRole);
ScrollingNodeID scrollingNodeIDForChildren() const;
bool hasMaskLayer() const { return m_maskLayer; }
bool hasChildClippingMaskLayer() const { return m_childClippingMaskLayer != nullptr; }
GraphicsLayer* parentForSublayers() const;
GraphicsLayer* childForSuperlayers() const;
// RenderLayers with backing normally short-circuit paintLayer() because
// their content is rendered via callbacks from GraphicsLayer. However, the document
// layer is special, because it has a GraphicsLayer to act as a container for the GraphicsLayers
// for descendants, but its contents usually render into the window (in which case this returns true).
// This returns false for other layers, and when the document layer actually needs to paint into its backing store
// for some reason.
bool paintsIntoWindow() const;
// Returns true for a composited layer that has no backing store of its own, so
// paints into some ancestor layer.
bool paintsIntoCompositedAncestor() const { return !m_requiresOwnBackingStore; }
void setRequiresOwnBackingStore(bool);
void setContentsNeedDisplay(GraphicsLayer::ShouldClipToLayer = GraphicsLayer::ClipToLayer);
// r is in the coordinate space of the layer's render object
void setContentsNeedDisplayInRect(const LayoutRect&, GraphicsLayer::ShouldClipToLayer = GraphicsLayer::ClipToLayer);
// Notification from the renderer that its content changed.
void contentChanged(ContentChangeType);
// Interface to start, finish, suspend and resume animations
bool startAnimation(double timeOffset, const Animation&, const KeyframeList&);
void animationPaused(double timeOffset, const String& name);
void animationFinished(const String& name);
void transformRelatedPropertyDidChange();
void suspendAnimations(MonotonicTime = MonotonicTime());
void resumeAnimations();
LayoutRect compositedBounds() const;
// Returns true if changed.
bool setCompositedBounds(const LayoutRect&);
// Returns true if changed.
bool updateCompositedBounds();
void updateAllowsBackingStoreDetaching(const LayoutRect& absoluteBounds);
#if ENABLE(ASYNC_SCROLLING)
bool maintainsEventRegion() const;
void updateEventRegion();
bool needsEventRegionUpdate() const { return m_needsEventRegionUpdate; }
void setNeedsEventRegionUpdate(bool needsUpdate = true) { m_needsEventRegionUpdate = needsUpdate; }
#endif
void updateAfterWidgetResize();
void positionOverflowControlsLayers();
bool isFrameLayerWithTiledBacking() const { return m_isFrameLayerWithTiledBacking; }
WEBCORE_EXPORT TiledBacking* tiledBacking() const;
void adjustTiledBackingCoverage();
void setTiledBackingHasMargins(bool hasExtendedBackgroundOnLeftAndRight, bool hasExtendedBackgroundOnTopAndBottom);
void updateDebugIndicators(bool showBorder, bool showRepaintCounter);
bool paintsSubpixelAntialiasedText() const { return m_paintsSubpixelAntialiasedText; }
// GraphicsLayerClient interface
void tiledBackingUsageChanged(const GraphicsLayer*, bool /*usingTiledBacking*/) override;
void notifyAnimationStarted(const GraphicsLayer*, const String& animationKey, MonotonicTime startTime) override;
void notifyFlushRequired(const GraphicsLayer*) override;
void notifyFlushBeforeDisplayRefresh(const GraphicsLayer*) override;
void paintContents(const GraphicsLayer*, GraphicsContext&, const FloatRect& clip, GraphicsLayerPaintBehavior) override;
float deviceScaleFactor() const override;
float contentsScaleMultiplierForNewTiles(const GraphicsLayer*) const override;
bool paintsOpaquelyAtNonIntegralScales(const GraphicsLayer*) const override;
float pageScaleFactor() const override;
float zoomedOutPageScaleFactor() const override;
void didChangePlatformLayerForLayer(const GraphicsLayer*) override;
bool getCurrentTransform(const GraphicsLayer*, TransformationMatrix&) const override;
bool isTrackingRepaints() const override;
bool shouldSkipLayerInDump(const GraphicsLayer*, OptionSet<LayerTreeAsTextOptions>) const override;
bool shouldDumpPropertyForLayer(const GraphicsLayer*, const char* propertyName, OptionSet<LayerTreeAsTextOptions>) const override;
bool shouldAggressivelyRetainTiles(const GraphicsLayer*) const override;
bool shouldTemporarilyRetainTileCohorts(const GraphicsLayer*) const override;
bool useGiantTiles() const override;
void logFilledVisibleFreshTile(unsigned) override;
bool needsPixelAligment() const override { return !m_isMainFrameRenderViewLayer; }
LayoutSize subpixelOffsetFromRenderer() const { return m_subpixelOffsetFromRenderer; }
TransformationMatrix transformMatrixForProperty(AnimatedPropertyID) const final;
#if PLATFORM(IOS_FAMILY)
bool needsIOSDumpRenderTreeMainFrameRenderViewLayerIsAlwaysOpaqueHack(const GraphicsLayer&) const override;
#endif
#ifndef NDEBUG
void verifyNotPainting() override;
#endif
WEBCORE_EXPORT LayoutRect contentsBox() const;
// For informative purposes only.
WEBCORE_EXPORT CompositingLayerType compositingLayerType() const;
GraphicsLayer* layerForHorizontalScrollbar() const { return m_layerForHorizontalScrollbar.get(); }
GraphicsLayer* layerForVerticalScrollbar() const { return m_layerForVerticalScrollbar.get(); }
GraphicsLayer* layerForScrollCorner() const { return m_layerForScrollCorner.get(); }
GraphicsLayer* overflowControlsContainer() const { return m_overflowControlsContainer.get(); }
void adjustOverflowControlsPositionRelativeToAncestor(const RenderLayer&);
bool canCompositeFilters() const { return m_canCompositeFilters; }
#if ENABLE(FILTERS_LEVEL_2)
bool canCompositeBackdropFilters() const { return m_canCompositeBackdropFilters; }
#endif
// Return an estimate of the backing store area (in pixels) allocated by this object's GraphicsLayers.
WEBCORE_EXPORT double backingStoreMemoryEstimate() const;
// For testing only.
WEBCORE_EXPORT void setUsesDisplayListDrawing(bool);
WEBCORE_EXPORT String displayListAsText(OptionSet<DisplayList::AsTextFlag>) const;
WEBCORE_EXPORT void setIsTrackingDisplayListReplay(bool);
WEBCORE_EXPORT String replayDisplayListAsText(OptionSet<DisplayList::AsTextFlag>) const;
private:
friend class PaintedContentsInfo;
FloatRect backgroundBoxForSimpleContainerPainting() const;
void createPrimaryGraphicsLayer();
void destroyGraphicsLayers();
void willDestroyLayer(const GraphicsLayer*);
LayoutRect compositedBoundsIncludingMargin() const;
Ref<GraphicsLayer> createGraphicsLayer(const String&, GraphicsLayer::Type = GraphicsLayer::Type::Normal);
RenderLayerModelObject& renderer() const { return m_owningLayer.renderer(); }
RenderBox* renderBox() const { return m_owningLayer.renderBox(); }
RenderLayerCompositor& compositor() const { return m_owningLayer.compositor(); }
void updateInternalHierarchy();
bool updateAncestorClipping(bool needsAncestorClip, const RenderLayer* compositingAncestor);
bool updateDescendantClippingLayer(bool needsDescendantClip);
bool updateOverflowControlsLayers(bool needsHorizontalScrollbarLayer, bool needsVerticalScrollbarLayer, bool needsScrollCornerLayer);
bool updateForegroundLayer(bool needsForegroundLayer);
bool updateBackgroundLayer(bool needsBackgroundLayer);
bool updateMaskingLayer(bool hasMask, bool hasClipPath);
bool requiresLayerForScrollbar(Scrollbar*) const;
bool requiresHorizontalScrollbarLayer() const;
bool requiresVerticalScrollbarLayer() const;
bool requiresScrollCornerLayer() const;
bool updateScrollingLayers(bool scrollingLayers);
void updateScrollOffset(ScrollOffset);
void setLocationOfScrolledContents(ScrollOffset, ScrollingLayerPositionAction);
void updateChildClippingStrategy(bool needsDescendantsClippingLayer);
void updateMaskingLayerGeometry();
void updateRootLayerConfiguration();
void updatePaintingPhases();
void setBackgroundLayerPaintsFixedRootBackground(bool);
LayoutSize contentOffsetInCompositingLayer() const;
LayoutSize offsetRelativeToRendererOriginForDescendantLayers() const;
void ensureClippingStackLayers(LayerAncestorClippingStack&);
void removeClippingStackLayers(LayerAncestorClippingStack&);
void updateClippingStackLayerGeometry(LayerAncestorClippingStack&, const RenderLayer* compositedAncestor, LayoutRect& parentGraphicsLayerRect);
void connectClippingStackLayers(LayerAncestorClippingStack&);
void updateOpacity(const RenderStyle&);
void updateTransform(const RenderStyle&);
void updateChildrenTransformAndAnchorPoint(const LayoutRect& primaryGraphicsLayerRect, LayoutSize offsetFromParentGraphicsLayer);
void updateFilters(const RenderStyle&);
#if ENABLE(FILTERS_LEVEL_2)
void updateBackdropFilters(const RenderStyle&);
void updateBackdropFiltersGeometry();
#endif
#if ENABLE(CSS_COMPOSITING)
void updateBlendMode(const RenderStyle&);
#endif
void updateContentsScalingFilters(const RenderStyle&);
// Return the opacity value that this layer should use for compositing.
float compositingOpacity(float rendererOpacity) const;
Color rendererBackgroundColor() const;
bool isMainFrameRenderViewLayer() const;
bool paintsBoxDecorations() const;
bool paintsContent(RenderLayer::PaintedContentRequest&) const;
void updateDrawsContent(PaintedContentsInfo&);
// Returns true if this compositing layer has no visible content.
bool isSimpleContainerCompositingLayer(PaintedContentsInfo&) const;
// Returns true if this layer has content that needs to be rendered by painting into the backing store.
bool containsPaintedContent(PaintedContentsInfo&) const;
// Returns true if the RenderLayer just contains an image that we can composite directly.
bool isDirectlyCompositedImage() const;
void updateImageContents(PaintedContentsInfo&);
void updateDirectlyCompositedBoxDecorations(PaintedContentsInfo&, bool& didUpdateContentsRect);
void updateDirectlyCompositedBackgroundColor(PaintedContentsInfo&, bool& didUpdateContentsRect);
void updateDirectlyCompositedBackgroundImage(PaintedContentsInfo&, bool& didUpdateContentsRect);
void resetContentsRect();
void updateContentsRects();
bool isPaintDestinationForDescendantLayers(RenderLayer::PaintedContentRequest&) const;
bool hasVisibleNonCompositedDescendants() const;
bool shouldClipCompositedBounds() const;
bool hasTiledBackingFlatteningLayer() const { return (m_childContainmentLayer && m_isFrameLayerWithTiledBacking); }
GraphicsLayer* tileCacheFlatteningLayer() const { return m_isFrameLayerWithTiledBacking ? m_childContainmentLayer.get() : nullptr; }
void paintIntoLayer(const GraphicsLayer*, GraphicsContext&, const IntRect& paintDirtyRect, OptionSet<PaintBehavior>, EventRegionContext* = nullptr);
OptionSet<RenderLayer::PaintLayerFlag> paintFlagsForLayer(const GraphicsLayer&) const;
void paintDebugOverlays(const GraphicsLayer*, GraphicsContext&);
static CSSPropertyID graphicsLayerToCSSProperty(AnimatedPropertyID);
static AnimatedPropertyID cssToGraphicsLayerProperty(CSSPropertyID);
bool canIssueSetNeedsDisplay() const { return !paintsIntoWindow() && !paintsIntoCompositedAncestor(); }
LayoutRect computeParentGraphicsLayerRect(const RenderLayer* compositedAncestor) const;
LayoutRect computePrimaryGraphicsLayerRect(const RenderLayer* compositedAncestor, const LayoutRect& parentGraphicsLayerRect) const;
#if USE(OWNING_LAYER_BEAR_TRAP)
uintptr_t m_owningLayerBearTrap { BEAR_TRAP_VALUE }; // webkit.org/b.206915
#endif
RenderLayer& m_owningLayer;
// A list other layers that paint into this backing store, later than m_owningLayer in paint order.
Vector<WeakPtr<RenderLayer>> m_backingSharingLayers;
std::unique_ptr<LayerAncestorClippingStack> m_ancestorClippingStack; // Only used if we are clipped by an ancestor which is not a stacking context.
std::unique_ptr<LayerAncestorClippingStack> m_overflowControlsHostLayerAncestorClippingStack; // Used when we have an overflow controls host layer which was reparented, and needs clipping by ancestors.
RefPtr<GraphicsLayer> m_contentsContainmentLayer; // Only used if we have a background layer; takes the transform.
RefPtr<GraphicsLayer> m_graphicsLayer;
RefPtr<GraphicsLayer> m_foregroundLayer; // Only used in cases where we need to draw the foreground separately.
RefPtr<GraphicsLayer> m_backgroundLayer; // Only used in cases where we need to draw the background separately.
RefPtr<GraphicsLayer> m_childContainmentLayer; // Only used if we have clipping on a stacking context with compositing children, or if the layer has a tile cache.
RefPtr<GraphicsLayer> m_maskLayer; // Only used if we have a mask and/or clip-path.
RefPtr<GraphicsLayer> m_childClippingMaskLayer; // Only used if we have to clip child layers or accelerated contents with border radius or clip-path.
RefPtr<GraphicsLayer> m_layerForHorizontalScrollbar;
RefPtr<GraphicsLayer> m_layerForVerticalScrollbar;
RefPtr<GraphicsLayer> m_layerForScrollCorner;
RefPtr<GraphicsLayer> m_overflowControlsContainer;
RefPtr<GraphicsLayer> m_scrollContainerLayer; // Only used if the layer is using composited scrolling.
RefPtr<GraphicsLayer> m_scrolledContentsLayer; // Only used if the layer is using composited scrolling.
LayoutRect m_compositedBounds;
LayoutSize m_subpixelOffsetFromRenderer; // This is the subpixel distance between the primary graphics layer and the associated renderer's bounds.
LayoutSize m_compositedBoundsOffsetFromGraphicsLayer; // This is the subpixel distance between the primary graphics layer and the render layer bounds.
ScrollingNodeID m_viewportConstrainedNodeID { 0 };
ScrollingNodeID m_scrollingNodeID { 0 };
ScrollingNodeID m_frameHostingNodeID { 0 };
ScrollingNodeID m_positioningNodeID { 0 };
bool m_artificiallyInflatedBounds { false }; // bounds had to be made non-zero to make transform-origin work
bool m_isMainFrameRenderViewLayer { false };
bool m_isFrameLayerWithTiledBacking { false };
bool m_requiresOwnBackingStore { true };
bool m_canCompositeFilters { false };
#if ENABLE(FILTERS_LEVEL_2)
bool m_canCompositeBackdropFilters { false };
#endif
bool m_backgroundLayerPaintsFixedRootBackground { false };
bool m_requiresBackgroundLayer { false };
bool m_hasSubpixelRounding { false };
bool m_paintsSubpixelAntialiasedText { false }; // This is for logging only.
#if ENABLE(ASYNC_SCROLLING)
bool m_needsEventRegionUpdate { true };
#endif
};
enum CanvasCompositingStrategy {
UnacceleratedCanvas,
CanvasPaintedToLayer,
CanvasAsLayerContents
};
CanvasCompositingStrategy canvasCompositingStrategy(const RenderObject&);
WTF::TextStream& operator<<(WTF::TextStream&, const RenderLayerBacking&);
} // namespace WebCore