AI 145796: Land the WebKit merge @r42026.

Automated import of CL 145796

1 files changed, 178 insertions, 0 deletions

diff --git a/WebCore/rendering/RenderLayerBacking.h b/WebCore/rendering/RenderLayerBacking.h
new file mode 100644
index 0000000..46b81ad
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+++ b/WebCore/rendering/RenderLayerBacking.h
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+/*
+ * Copyright (C) 2009 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 RenderLayerBacking_h
+#define RenderLayerBacking_h
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "FloatPoint.h"
+#include "FloatPoint3D.h"
+#include "GraphicsLayer.h"
+#include "GraphicsLayerClient.h"
+#include "RenderLayer.h"
+#include "TransformationMatrix.h"
+
+namespace WebCore {
+
+class KeyframeList;
+class RenderLayerCompositor;
+
+// 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 : public GraphicsLayerClient {
+public:
+    RenderLayerBacking(RenderLayer*);
+    ~RenderLayerBacking();
+
+    RenderLayer* owningLayer() const { return m_owningLayer; }
+
+    void updateAfterLayout();
+    
+    // Returns true if layer configuration changed.
+    bool updateGraphicsLayers(bool needsContentsLayer, bool needsUpperClippingLayer, bool needsLowerClippingLayer, bool needsRepaint);
+    void updateGraphicsLayerGeometry();
+    void updateInternalHierarchy();
+    
+    GraphicsLayer* graphicsLayer() const { return m_graphicsLayer; }
+
+    // Layer to clip children
+    bool hasClippingLayer() const { return m_clippingLayer != 0; }
+    GraphicsLayer* clippingLayer() const { return m_clippingLayer; }
+
+    // Layer to get clipped by ancestor
+    bool hasAncestorClippingLayer() const { return m_ancestorClippingLayer != 0; }
+    GraphicsLayer* ancestorClippingLayer() const { return m_ancestorClippingLayer; }
+
+    bool hasContentsLayer() const { return m_contentsLayer != 0; }
+    GraphicsLayer* contentsLayer() const { return m_contentsLayer; }
+    
+    GraphicsLayer* parentForSublayers() const { return m_clippingLayer ? m_clippingLayer : m_graphicsLayer; }
+    GraphicsLayer* childForSuperlayers() const { return m_ancestorClippingLayer ? m_ancestorClippingLayer : m_graphicsLayer; }
+
+    // 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 paintingGoesToWindow() const;
+
+    void setContentsNeedDisplay();
+    // r is in the coordinate space of the layer's render object
+    void setContentsNeedDisplayInRect(const IntRect& r);
+
+    // Notification from the renderer that its content changed; used by RenderImage.
+    void rendererContentChanged();
+
+    // Interface to start, finish, suspend and resume animations and transitions
+    bool startAnimation(double beginTime, const Animation* anim, const KeyframeList& keyframes);
+    bool startTransition(double beginTime, int property, const RenderStyle* fromStyle, const RenderStyle* toStyle);
+    void animationFinished(const String& name, int index, bool reset);
+    void transitionFinished(int property);
+
+    void suspendAnimations();
+    void resumeAnimations();
+
+    FloatPoint graphicsLayerToContentsCoordinates(const GraphicsLayer*, const FloatPoint&);
+    FloatPoint contentsToGraphicsLayerCoordinates(const GraphicsLayer*, const FloatPoint&);
+
+    void detectDrawingOptimizations();
+    void invalidateDrawingOptimizations();
+
+    // GraphicsLayerClient interface
+    virtual void notifyAnimationStarted(const GraphicsLayer*, double startTime);
+
+    virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& clip);
+
+    virtual IntRect contentsBox(const GraphicsLayer*);
+    
+private:
+    void createGraphicsLayer();
+    void destroyGraphicsLayer();
+
+    RenderBoxModelObject* renderer() const { return m_owningLayer->renderer(); }
+    RenderLayerCompositor* compositor() const { return m_owningLayer->compositor(); }
+
+    bool updateClippingLayers(bool needsAncestorClip, bool needsDescendantClip);
+    bool updateContentsLayer(bool needsContentsLayer);
+
+    IntSize contentOffsetInCompostingLayer();
+    // Result is transform origin in pixels.
+    FloatPoint3D computeTransformOrigin(const IntRect& borderBox) const;
+    // Result is perspective origin in pixels.
+    FloatPoint computePerspectiveOrigin(const IntRect& borderBox) const;
+
+    void updateLayerOpacity();
+    void updateLayerTransform();
+
+    // Return the opacity value that this layer should use for compositing.
+    float compositingOpacity(float rendererOpacity) const;
+    
+    // Returns true if this RenderLayer only has content that can be rendered directly
+    // by the compositing layer, without drawing (e.g. solid background color).
+    bool isSimpleContainerCompositingLayer();
+    // Returns true if we can optimize the RenderLayer to draw the replaced content
+    // directly into a compositing buffer
+    bool canUseDirectCompositing() const;
+    void updateImageContents();
+
+    bool rendererHasBackground() const;
+    const Color& rendererBackgroundColor() const;
+
+    bool canBeSimpleContainerCompositingLayer() const;
+    bool hasNonCompositingContent() const;
+    
+    void paintIntoLayer(RenderLayer* rootLayer, GraphicsContext*, const IntRect& paintDirtyRect,
+                    bool haveTransparency, PaintRestriction paintRestriction, GraphicsLayerPaintingPhase, RenderObject* paintingRoot);
+
+    static int graphicsLayerToCSSProperty(AnimatedPropertyID);
+    static AnimatedPropertyID cssToGraphicsLayerProperty(int);
+
+private:
+    RenderLayer* m_owningLayer;
+
+    GraphicsLayer* m_ancestorClippingLayer; // only used if we are clipped by an ancestor which is not a stacking context
+    GraphicsLayer* m_graphicsLayer;
+    GraphicsLayer* m_contentsLayer;         // only used in cases where we need to draw the foreground separately
+    GraphicsLayer* m_clippingLayer;         // only used if we have clipping on a stacking context, with compositing children
+
+    IntSize m_compositingContentOffset;
+
+    bool m_isSimpleContainerCompositingLayer : 1;  // is this compositing layer able to be simplified
+    bool m_simpleCompositingLayerStatusDirty : 1; // set if the test for simple layers needs to be redone
+
+    bool m_compositingContentOffsetDirty: 1;
+};
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif // RenderLayerBacking_h