Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 238 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/RenderLayerBacking.h b/Source/WebCore/rendering/RenderLayerBacking.h
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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 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;
+
+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 : public GraphicsLayerClient {
+    WTF_MAKE_NONCOPYABLE(RenderLayerBacking); WTF_MAKE_FAST_ALLOCATED;
+public:
+    RenderLayerBacking(RenderLayer*);
+    ~RenderLayerBacking();
+
+    RenderLayer* owningLayer() const { return m_owningLayer; }
+
+    enum UpdateDepth { CompositingChildren, AllDescendants };
+    void updateAfterLayout(UpdateDepth, bool isUpdateRoot);
+    
+    // Returns true if layer configuration changed.
+    bool updateGraphicsLayerConfiguration();
+    // Update graphics layer position and bounds.
+    void updateGraphicsLayerGeometry(); // make private
+    // Update contents and clipping structure.
+    void updateDrawsContent();
+    
+    GraphicsLayer* graphicsLayer() const { return m_graphicsLayer.get(); }
+
+    // Layer to clip children
+    bool hasClippingLayer() const { return m_clippingLayer != 0; }
+    GraphicsLayer* clippingLayer() const { return m_clippingLayer.get(); }
+
+    // Layer to get clipped by ancestor
+    bool hasAncestorClippingLayer() const { return m_ancestorClippingLayer != 0; }
+    GraphicsLayer* ancestorClippingLayer() const { return m_ancestorClippingLayer.get(); }
+
+    bool hasContentsLayer() const { return m_foregroundLayer != 0; }
+    GraphicsLayer* foregroundLayer() const { return m_foregroundLayer.get(); }
+    
+    bool hasMaskLayer() const { return m_maskLayer != 0; }
+
+    GraphicsLayer* parentForSublayers() const { return m_clippingLayer ? m_clippingLayer.get() : m_graphicsLayer.get(); }
+    GraphicsLayer* childForSuperlayers() const { return m_ancestorClippingLayer ? m_ancestorClippingLayer.get() : m_graphicsLayer.get(); }
+
+    // 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 LayoutRect&);
+
+    // Notification from the renderer that its content changed.
+    void contentChanged(RenderLayer::ContentChangeType);
+
+    // Interface to start, finish, suspend and resume animations and transitions
+    bool startTransition(double timeOffset, int property, const RenderStyle* fromStyle, const RenderStyle* toStyle);
+    void transitionPaused(double timeOffset, int property);
+    void transitionFinished(int property);
+
+    bool startAnimation(double timeOffset, const Animation* anim, const KeyframeList& keyframes);
+    void animationPaused(double timeOffset, const String& name);
+    void animationFinished(const String& name);
+
+    void suspendAnimations(double time = 0);
+    void resumeAnimations();
+
+    LayoutRect compositedBounds() const;
+    void setCompositedBounds(const LayoutRect&);
+    void updateCompositedBounds();
+    
+    void updateAfterWidgetResize();
+
+    // GraphicsLayerClient interface
+    virtual bool shouldUseTileCache(const GraphicsLayer*) const;
+    virtual void notifyAnimationStarted(const GraphicsLayer*, double startTime);
+    virtual void notifySyncRequired(const GraphicsLayer*);
+
+    virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const LayoutRect& clip);
+
+    virtual float deviceScaleFactor() const;
+    virtual float pageScaleFactor() const;
+    virtual void didCommitChangesForLayer(const GraphicsLayer*) const;
+
+    virtual bool showDebugBorders() const;
+    virtual bool showRepaintCounter() const;
+
+    LayoutRect contentsBox() const;
+    
+    // For informative purposes only.
+    CompositingLayerType compositingLayerType() const;
+    
+    GraphicsLayer* layerForHorizontalScrollbar() const { return m_layerForHorizontalScrollbar.get(); }
+    GraphicsLayer* layerForVerticalScrollbar() const { return m_layerForVerticalScrollbar.get(); }
+    GraphicsLayer* layerForScrollCorner() const { return m_layerForScrollCorner.get(); }
+
+#if ENABLE(CSS_FILTERS)
+    bool canCompositeFilters() const { return m_canCompositeFilters; }
+#endif
+    
+private:
+    void createPrimaryGraphicsLayer();
+    void destroyGraphicsLayers();
+    
+    PassOwnPtr<GraphicsLayer> createGraphicsLayer(const String&);
+
+    RenderBoxModelObject* renderer() const { return m_owningLayer->renderer(); }
+    RenderLayerCompositor* compositor() const { return m_owningLayer->compositor(); }
+
+    void updateInternalHierarchy();
+    bool updateClippingLayers(bool needsAncestorClip, bool needsDescendantClip);
+    bool updateOverflowControlsLayers(bool needsHorizontalScrollbarLayer, bool needsVerticalScrollbarLayer, bool needsScrollCornerLayer);
+    bool updateForegroundLayer(bool needsForegroundLayer);
+    bool updateMaskLayer(bool needsMaskLayer);
+    bool requiresHorizontalScrollbarLayer() const;
+    bool requiresVerticalScrollbarLayer() const;
+    bool requiresScrollCornerLayer() const;
+
+    GraphicsLayerPaintingPhase paintingPhaseForPrimaryLayer() const;
+    
+    LayoutSize contentOffsetInCompostingLayer() const;
+    // Result is transform origin in pixels.
+    FloatPoint3D computeTransformOrigin(const LayoutRect& borderBox) const;
+    // Result is perspective origin in pixels.
+    FloatPoint computePerspectiveOrigin(const LayoutRect& borderBox) const;
+
+    void updateLayerOpacity(const RenderStyle*);
+    void updateLayerTransform(const RenderStyle*);
+#if ENABLE(CSS_FILTERS)
+    void updateLayerFilters(const RenderStyle*);
+#endif
+
+    // Return the opacity value that this layer should use for compositing.
+    float compositingOpacity(float rendererOpacity) const;
+    
+    bool isMainFrameRenderViewLayer() const;
+    
+    // Returns true if this compositing layer has no visible content.
+    bool isSimpleContainerCompositingLayer() 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();
+
+    bool rendererHasBackground() const;
+    Color rendererBackgroundColor() const;
+    void updateBackgroundColor();
+
+    bool hasVisibleNonCompositingDescendants() const;
+    
+    void paintIntoLayer(RenderLayer* rootLayer, GraphicsContext*, const LayoutRect& paintDirtyRect, PaintBehavior, GraphicsLayerPaintingPhase, RenderObject* paintingRoot);
+
+    static int graphicsLayerToCSSProperty(AnimatedPropertyID);
+    static AnimatedPropertyID cssToGraphicsLayerProperty(int);
+
+#ifndef NDEBUG
+    String nameForLayer() const;
+#endif
+
+    RenderLayer* m_owningLayer;
+
+    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_foregroundLayer;       // only used in cases where we need to draw the foreground separately
+    OwnPtr<GraphicsLayer> m_clippingLayer;         // only used if we have clipping on a stacking context, with compositing children
+    OwnPtr<GraphicsLayer> m_maskLayer;             // only used if we have a mask
+
+    OwnPtr<GraphicsLayer> m_layerForHorizontalScrollbar;
+    OwnPtr<GraphicsLayer> m_layerForVerticalScrollbar;
+    OwnPtr<GraphicsLayer> m_layerForScrollCorner;
+
+    LayoutRect m_compositedBounds;
+
+    bool m_artificiallyInflatedBounds;      // bounds had to be made non-zero to make transform-origin work
+    bool m_isMainFrameRenderViewLayer;
+    bool m_usingTiledCacheLayer;
+#if ENABLE(CSS_FILTERS)
+    bool m_canCompositeFilters;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif // RenderLayerBacking_h