--- /dev/null
+/*
+ * 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 updateGraphicsLayerConfiguration();
+ 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&);
+
+ // GraphicsLayerClient interface
+ virtual void notifyAnimationStarted(const GraphicsLayer*, double startTime);
+
+ virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& clip);
+
+ virtual IntRect contentsBox(const GraphicsLayer*);
+
+ void setDocumentScale(float scale);
+
+private:
+ void createGraphicsLayer();
+ void destroyGraphicsLayer();
+
+ RenderBox* 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() const;
+ // 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 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_hasDirectlyCompositedContent: 1;
+ bool m_compositingContentOffsetDirty: 1;
+};
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)
+
+#endif // RenderLayerBacking_h
projects / iphone-api.git / blobdiff