Remove most of the old compositing code.

sky/engine/core/rendering/compositing/CompositedLayerMapping.h

Index: sky/engine/core/rendering/compositing/CompositedLayerMapping.h
diff --git a/sky/engine/core/rendering/compositing/CompositedLayerMapping.h b/sky/engine/core/rendering/compositing/CompositedLayerMapping.h
deleted file mode 100644
index 5633a626d3af6b8c174c9582f10e2e19585a1581..0000000000000000000000000000000000000000
--- a/sky/engine/core/rendering/compositing/CompositedLayerMapping.h
+++ /dev/null
@@ -1,390 +0,0 @@
-/*
- * 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 COMPUTER, 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.
- */
-
-#ifndef SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITEDLAYERMAPPING_H_
-#define SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITEDLAYERMAPPING_H_
-
-#include "sky/engine/core/rendering/RenderLayer.h"
-#include "sky/engine/core/rendering/compositing/GraphicsLayerUpdater.h"
-#include "sky/engine/platform/geometry/FloatPoint.h"
-#include "sky/engine/platform/geometry/FloatPoint3D.h"
-#include "sky/engine/platform/graphics/GraphicsLayer.h"
-#include "sky/engine/platform/graphics/GraphicsLayerClient.h"
-
-namespace blink {
-
-class RenderLayerCompositor;
-
-// A GraphicsLayerPaintInfo contains all the info needed to paint a partial subtree of RenderLayers into a GraphicsLayer.
-struct GraphicsLayerPaintInfo {
-    RenderLayer* renderLayer;
-
-    LayoutRect compositedBounds;
-
-    // The clip rect to apply, in the local coordinate space of the squashed layer, when painting it.
-    IntRect localClipRectForSquashedLayer;
-
-    // Offset describing where this squashed RenderLayer paints into the shared GraphicsLayer backing.
-    IntSize offsetFromRenderer;
-    bool offsetFromRendererSet;
-
-    GraphicsLayerPaintInfo() : renderLayer(0), offsetFromRendererSet(false) { }
-};
-
-enum GraphicsLayerUpdateScope {
-    GraphicsLayerUpdateNone,
-    GraphicsLayerUpdateLocal,
-    GraphicsLayerUpdateSubtree,
-};
-
-// CompositedLayerMapping keeps track of how RenderLayers of the render tree correspond to
-// GraphicsLayers of the composited layer tree. Each instance of CompositedLayerMapping
-// manages a small cluster of GraphicsLayers and the references to which RenderLayers
-// and paint phases contribute to each GraphicsLayer.
-//
-// Currently (Oct. 2013) there is one CompositedLayerMapping for each RenderLayer,
-// but this is likely to evolve soon.
-class CompositedLayerMapping final : public GraphicsLayerClient {
-    WTF_MAKE_NONCOPYABLE(CompositedLayerMapping); WTF_MAKE_FAST_ALLOCATED;
-public:
-    explicit CompositedLayerMapping(RenderLayer&);
-    virtual ~CompositedLayerMapping();
-
-    RenderLayer& owningLayer() const { return m_owningLayer; }
-
-    bool updateGraphicsLayerConfiguration();
-    void updateGraphicsLayerGeometry(const RenderLayer* compositingContainer, const RenderLayer* compositingStackingContext, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-
-    // Update whether layer needs blending.
-    void updateContentsOpaque();
-
-    GraphicsLayer* mainGraphicsLayer() const { return m_graphicsLayer.get(); }
-
-    // Layer to clip children
-    bool hasClippingLayer() const { return m_childContainmentLayer; }
-    GraphicsLayer* clippingLayer() const { return m_childContainmentLayer.get(); }
-
-    // Layer to get clipped by ancestor
-    bool hasAncestorClippingLayer() const { return m_ancestorClippingLayer; }
-    GraphicsLayer* ancestorClippingLayer() const { return m_ancestorClippingLayer.get(); }
-
-    bool hasContentsLayer() const { return m_foregroundLayer; }
-    GraphicsLayer* foregroundLayer() const { return m_foregroundLayer.get(); }
-
-    GraphicsLayer* backgroundLayer() const { return m_backgroundLayer.get(); }
-    bool backgroundLayerPaintsFixedRootBackground() const { return m_backgroundLayerPaintsFixedRootBackground; }
-
-    bool hasMaskLayer() const { return m_maskLayer; }
-    GraphicsLayer* maskLayer() const { return m_maskLayer.get(); }
-
-    bool hasChildClippingMaskLayer() const { return m_childClippingMaskLayer; }
-    GraphicsLayer* childClippingMaskLayer() const { return m_childClippingMaskLayer.get(); }
-
-    GraphicsLayer* parentForSublayers() const;
-    GraphicsLayer* childForSuperlayers() const;
-
-    GraphicsLayer* childTransformLayer() const { return m_childTransformLayer.get(); }
-
-    GraphicsLayer* squashingContainmentLayer() const { return m_squashingContainmentLayer.get(); }
-    GraphicsLayer* squashingLayer() const { return m_squashingLayer.get(); }
-    // Contains the bottommost layer in the hierarchy that can contain the children transform.
-    GraphicsLayer* layerForChildrenTransform() 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_requiresOwnBackingStoreForAncestorReasons || m_requiresOwnBackingStoreForIntrinsicReasons); }
-
-    // Updates whether a backing store is needed based on the layer's compositing ancestor's
-    // properties; returns true if the need for a backing store for ancestor reasons changed.
-    bool updateRequiresOwnBackingStoreForAncestorReasons(const RenderLayer* compositingAncestor);
-
-    // Updates whether a backing store is needed for intrinsic reasons (that is, based on the
-    // layer's own properties or compositing reasons); returns true if the intrinsic need for
-    // a backing store changed.
-    bool updateRequiresOwnBackingStoreForIntrinsicReasons();
-
-    void setSquashingContentsNeedDisplay();
-    void setContentsNeedDisplay();
-    // r is in the coordinate space of the layer's render object
-    void setContentsNeedDisplayInRect(const LayoutRect&);
-
-    // Notification from the renderer that its content changed.
-    void contentChanged(ContentChangeType);
-
-    LayoutRect compositedBounds() const { return m_compositedBounds; }
-    IntRect pixelSnappedCompositedBounds() const;
-
-    // Returns true if the assignment actually changed the assigned squashing layer.
-    bool updateSquashingLayerAssignment(RenderLayer* squashedLayer, const RenderLayer& owningLayer, size_t nextSquashedLayerIndex);
-    void removeRenderLayerFromSquashingGraphicsLayer(const RenderLayer*);
-
-    void finishAccumulatingSquashingLayers(size_t nextSquashedLayerIndex);
-    void updateRenderingContext();
-    void updateShouldFlattenTransform();
-
-    // GraphicsLayerClient interface
-    virtual void notifyAnimationStarted(const GraphicsLayer*, double monotonicTime) override;
-    virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& clip) override;
-    virtual bool isTrackingPaintInvalidations() const override;
-
-#if ENABLE(ASSERT)
-    virtual void verifyNotPainting() override;
-#endif
-
-    LayoutRect contentsBox() const;
-
-    // Returns true if the overflow controls cannot be positioned within this
-    // CLM's internal hierarchy without incorrectly stacking under some
-    // scrolling content. If this returns true, these controls must be
-    // repositioned in the graphics layer tree to ensure that they stack above
-    // scrolling content.
-    bool needsToReparentOverflowControls() const;
-
-    // Removes the overflow controls host layer from its parent and positions it
-    // so that it can be inserted as a sibling to this CLM without changing
-    // position.
-    GraphicsLayer* detachLayerForOverflowControls(const RenderLayer& enclosingLayer);
-
-    void updateFilters(const RenderStyle*);
-
-    void setBlendMode(WebBlendMode);
-
-    bool needsGraphicsLayerUpdate() { return m_pendingUpdateScope > GraphicsLayerUpdateNone; }
-    void setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateScope scope) { m_pendingUpdateScope = std::max(static_cast<GraphicsLayerUpdateScope>(m_pendingUpdateScope), scope); }
-    void clearNeedsGraphicsLayerUpdate() { m_pendingUpdateScope = GraphicsLayerUpdateNone; }
-
-    GraphicsLayerUpdater::UpdateType updateTypeForChildren(GraphicsLayerUpdater::UpdateType) const;
-
-#if ENABLE(ASSERT)
-    void assertNeedsToUpdateGraphicsLayerBitsCleared() {  ASSERT(m_pendingUpdateScope == GraphicsLayerUpdateNone); }
-#endif
-
-    virtual String debugName(const GraphicsLayer*) override;
-
-    LayoutSize contentOffsetInCompositingLayer() const;
-
-    LayoutPoint squashingOffsetFromTransformedAncestor()
-    {
-        return m_squashingLayerOffsetFromTransformedAncestor;
-    }
-
-    // If there is a squashed layer painting into this CLM that is an ancestor of the given RenderObject, return it. Otherwise return 0.
-    const GraphicsLayerPaintInfo* containingSquashedLayer(const RenderObject*);
-
-private:
-    static const GraphicsLayerPaintInfo* containingSquashedLayer(const RenderObject*,  const Vector<GraphicsLayerPaintInfo>& layers);
-
-    // Helper methods to updateGraphicsLayerGeometry:
-    void computeGraphicsLayerParentLocation(const RenderLayer* compositingContainer, const IntRect& ancestorCompositingBounds, IntPoint& graphicsLayerParentLocation);
-    void updateSquashingLayerGeometry(const LayoutPoint& offsetFromCompositedAncestor, const IntPoint& graphicsLayerParentLocation, const RenderLayer& referenceLayer, Vector<GraphicsLayerPaintInfo>& layers, GraphicsLayer*, LayoutPoint* offsetFromTransformedAncestor, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-    void updateMainGraphicsLayerGeometry(const IntRect& relativeCompositingBounds, const IntRect& localCompositingBounds, const IntPoint& graphicsLayerParentLocation);
-    void updateAncestorClippingLayerGeometry(const RenderLayer* compositingContainer, const IntPoint& snappedOffsetFromCompositedAncestor, IntPoint& graphicsLayerParentLocation);
-    void updateOverflowControlsHostLayerGeometry(const RenderLayer* compositingStackingContext);
-    void updateChildContainmentLayerGeometry(const IntRect& clippingBox, const IntRect& localCompositingBounds);
-    void updateChildTransformLayerGeometry();
-    void updateMaskLayerGeometry();
-    void updateTransformGeometry(const IntPoint& snappedOffsetFromCompositedAncestor, const IntRect& relativeCompositingBounds);
-    void updateForegroundLayerGeometry(const FloatSize& relativeCompositingBoundsSize, const IntRect& clippingBox);
-    void updateBackgroundLayerGeometry(const FloatSize& relativeCompositingBoundsSize);
-    void updateChildClippingMaskLayerGeometry();
-
-    void createPrimaryGraphicsLayer();
-    void destroyGraphicsLayers();
-
-    PassOwnPtr<GraphicsLayer> createGraphicsLayer(CompositingReasons);
-
-    RenderLayerModelObject* renderer() const { return m_owningLayer.renderer(); }
-    RenderLayerCompositor* compositor() const { return m_owningLayer.compositor(); }
-
-    void updateInternalHierarchy();
-    void updatePaintingPhases();
-    bool updateClippingLayers(bool needsAncestorClip, bool needsDescendantClip);
-    bool updateChildTransformLayer(bool needsChildTransformLayer);
-    bool updateForegroundLayer(bool needsForegroundLayer);
-    bool updateBackgroundLayer(bool needsBackgroundLayer);
-    bool updateMaskLayer(bool needsMaskLayer);
-    bool updateClippingMaskLayers(bool needsChildClippingMaskLayer);
-    void updateClipParent();
-    bool updateSquashingLayers(bool needsSquashingLayers);
-    void updateDrawsContent();
-    void updateChildrenTransform();
-    void updateCompositedBounds();
-
-    // Also sets subpixelAccumulation on the layer.
-    void computeBoundsOfOwningLayer(const RenderLayer* compositedAncestor, IntRect& localCompositingBounds, IntRect& compositingBoundsRelativeToCompositedAncestor, LayoutPoint& offsetFromCompositedAncestor, IntPoint& snappedOffsetFromCompositedAncestor);
-
-    void setBackgroundLayerPaintsFixedRootBackground(bool);
-
-    GraphicsLayerPaintingPhase paintingPhaseForPrimaryLayer() const;
-
-    // Result is transform origin in pixels.
-    FloatPoint3D computeTransformOrigin(const IntRect& borderBox) const;
-
-    void updateOpacity(const RenderStyle*);
-    void updateTransform(const RenderStyle*);
-    // Return the opacity value that this layer should use for compositing.
-    float compositingOpacity(float rendererOpacity) const;
-
-    bool paintsChildren() const;
-
-    // Returns true if this layer has content that needs to be rendered by painting into the backing store.
-    bool containsPaintedContent() const;
-    // Returns true if the RenderLayer just contains an image that we can composite directly.
-    bool isDirectlyCompositedImage() const;
-    void updateImageContents();
-
-    Color rendererBackgroundColor() const;
-    void updateBackgroundColor();
-    void updateContentsRect();
-    void updateContentsOffsetInCompositingLayer(const IntPoint& snappedOffsetFromCompositedAncestor, const IntPoint& graphicsLayerParentLocation);
-    void updateCompositingReasons();
-
-    void doPaintTask(const GraphicsLayerPaintInfo&, const PaintLayerFlags&, GraphicsContext*, const IntRect& clip);
-
-    // Computes the background clip rect for the given squashed layer, up to any containing layer that is squashed into the
-    // same squashing layer and contains this squashed layer's clipping ancestor.
-    // The clip rect is returned in the coordinate space of the given squashed layer.
-    // If there is no such containing layer, returns the infinite rect.
-    // FIXME: unify this code with the code that sets up m_ancestorClippingLayer. They are doing very similar things.
-    static IntRect localClipRectForSquashedLayer(const RenderLayer& referenceLayer, const GraphicsLayerPaintInfo&,  const Vector<GraphicsLayerPaintInfo>& layers);
-
-    // Return true if |m_owningLayer|'s compositing ancestor is not a descendant (inclusive) of the
-    // clipping container for |m_owningLayer|.
-    bool owningLayerClippedByLayerNotAboveCompositedAncestor();
-
-    RenderLayer& m_owningLayer;
-
-    // The hierarchy of layers that is maintained by the CompositedLayerMapping looks like this:
-    //
-    //  + m_ancestorClippingLayer [OPTIONAL]
-    //     + m_graphicsLayer
-    //        + m_childContainmentLayer [OPTIONAL] <-OR-> m_childTransformLayer
-    //        |
-    //        + m_overflowControlsClippingLayer [OPTIONAL] // *The overflow controls may need to be repositioned in the
-    //          + m_overflowControlsHostLayer              //  graphics layer tree by the RLC to ensure that they stack
-    //
-    // We need an ancestor clipping layer if our clipping ancestor is not our ancestor in the
-    // clipping tree. Here's what that might look like.
-    //
-    // Let A = the clipping ancestor,
-    //     B = the clip descendant, and
-    //     SC = the stacking context that is the ancestor of A and B in the stacking tree.
-    //
-    // SC
-    //  + A = m_graphicsLayer
-    //  |  + m_childContainmentLayer
-    //  |     + ...
-    //  ...
-    //  |
-    //  + B = m_ancestorClippingLayer [+]
-    //     + m_graphicsLayer
-    //        + ...
-    //
-    // In this case B is clipped by another layer that doesn't happen to be its ancestor: A.
-    // So we create an ancestor clipping layer for B, [+], which ensures that B is clipped
-    // as if it had been A's descendant.
-    OwnPtr<GraphicsLayer> m_ancestorClippingLayer; // Only used if we are clipped by an ancestor which is not a stacking context.
-    OwnPtr<GraphicsLayer> m_graphicsLayer;
-    OwnPtr<GraphicsLayer> m_childContainmentLayer; // Only used if we have clipping on a stacking context with compositing children.
-    OwnPtr<GraphicsLayer> m_childTransformLayer; // Only used if we have perspective and no m_childContainmentLayer.
-
-    // This layer is also added to the hierarchy by the RLB, but in a different way than
-    // the layers above. It's added to m_graphicsLayer as its mask layer (naturally) if
-    // we have a mask, and isn't part of the typical hierarchy (it has no children).
-    OwnPtr<GraphicsLayer> m_maskLayer; // Only used if we have a mask.
-    OwnPtr<GraphicsLayer> m_childClippingMaskLayer; // Only used if we have to clip child layers or accelerated contents with border radius or clip-path.
-
-    // There are two other (optional) layers whose painting is managed by the CompositedLayerMapping,
-    // but whose position in the hierarchy is maintained by the RenderLayerCompositor. These
-    // are the foreground and background layers. The foreground layer exists if we have composited
-    // descendants with negative z-order. We need the extra layer in this case because the layer
-    // needs to draw both below (for the background, say) and above (for the normal flow content, say)
-    // the negative z-order descendants and this is impossible with a single layer. The RLC handles
-    // inserting m_foregroundLayer in the correct position in our descendant list for us (right after
-    // the neg z-order dsecendants).
-    //
-    // The background layer is only created if this is the root layer and our background is entirely
-    // fixed. In this case we want to put the background in a separate composited layer so that when
-    // we scroll, we don't have to re-raster the background into position. This layer is also inserted
-    // into the tree by the RLC as it gets a special home. This layer becomes a descendant of the
-    // frame clipping layer. That is:
-    //   ...
-    //     + frame clipping layer
-    //       + m_backgroundLayer
-    //       + frame scrolling layer
-    //         + root content layer
-    //
-    // With the hierarchy set up like this, the root content layer is able to scroll without affecting
-    // the background layer (or paint invalidation).
-    OwnPtr<GraphicsLayer> m_foregroundLayer; // Only used in cases where we need to draw the foreground separately.
-    OwnPtr<GraphicsLayer> m_backgroundLayer; // Only used in cases where we need to draw the background separately.
-
-    // This layer exists to simplify the reparenting of overflow control that is occasionally required
-    // to ensure that scrollbars appear above scrolling content.
-    OwnPtr<GraphicsLayer> m_overflowControlsHostLayer;
-
-    // The reparented overflow controls sometimes need to be clipped by a non-ancestor. In just the same
-    // way we need an ancestor clipping layer to clip this CLM's internal hierarchy, we add another layer
-    // to clip the overflow controls. It would be possible to make m_overflowControlsHostLayer be
-    // responsible for applying this clip, but that could require repositioning all of the overflow
-    // controls since the this clip may apply an offset. By using a separate layer, the overflow controls
-    // can remain ignorant of the layers above them and still work correctly.
-    OwnPtr<GraphicsLayer> m_overflowControlsClippingLayer;
-
-    // A squashing CLM has two possible squashing-related structures.
-    //
-    // If m_ancestorClippingLayer is present:
-    //
-    // m_ancestorClippingLayer
-    //   + m_graphicsLayer
-    //   + m_squashingLayer
-    //
-    // If not:
-    //
-    // m_squashingContainmentLayer
-    //   + m_graphicsLayer
-    //   + m_squashingLayer
-    //
-    // Stacking children of a squashed layer receive graphics layers that are parented to the compositd ancestor of the
-    // squashed layer (i.e. nearest enclosing composited layer that is not squashed).
-    OwnPtr<GraphicsLayer> m_squashingContainmentLayer; // Only used if any squashed layers exist and m_squashingContainmentLayer is not present, to contain the squashed layers as siblings to the rest of the GraphicsLayer tree chunk.
-    OwnPtr<GraphicsLayer> m_squashingLayer; // Only used if any squashed layers exist, this is the backing that squashed layers paint into.
-    Vector<GraphicsLayerPaintInfo> m_squashedLayers;
-    LayoutPoint m_squashingLayerOffsetFromTransformedAncestor;
-
-    LayoutRect m_compositedBounds;
-
-    LayoutSize m_contentOffsetInCompositingLayer;
-    unsigned m_contentOffsetInCompositingLayerDirty : 1;
-
-    unsigned m_pendingUpdateScope : 2;
-    unsigned m_requiresOwnBackingStoreForIntrinsicReasons : 1;
-    unsigned m_requiresOwnBackingStoreForAncestorReasons : 1;
-    unsigned m_backgroundLayerPaintsFixedRootBackground : 1;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITEDLAYERMAPPING_H_