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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 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 GraphicsLayerClient_h
#define GraphicsLayerClient_h
namespace WebCore {
class FloatPoint;
class FloatRect;
class GraphicsContext;
class GraphicsLayer;
class IntPoint;
class IntRect;
class TransformationMatrix;
enum GraphicsLayerPaintingPhaseFlags {
GraphicsLayerPaintBackground = (1 << 0),
GraphicsLayerPaintForeground = (1 << 1),
GraphicsLayerPaintMask = (1 << 2),
GraphicsLayerPaintOverflowContents = (1 << 3),
GraphicsLayerPaintCompositedScroll = (1 << 4),
GraphicsLayerPaintAllWithOverflowClip = (GraphicsLayerPaintBackground | GraphicsLayerPaintForeground | GraphicsLayerPaintMask)
};
typedef unsigned GraphicsLayerPaintingPhase;
enum AnimatedPropertyID {
AnimatedPropertyInvalid,
AnimatedPropertyWebkitTransform,
AnimatedPropertyOpacity,
AnimatedPropertyBackgroundColor,
AnimatedPropertyWebkitFilter
};
class GraphicsLayerClient {
public:
virtual ~GraphicsLayerClient() {}
virtual bool shouldUseTiledBacking(const GraphicsLayer*) const { return false; }
virtual void tiledBackingUsageChanged(const GraphicsLayer*, bool /*usingTiledBacking*/) { }
// Callback for when hardware-accelerated animation started.
virtual void notifyAnimationStarted(const GraphicsLayer*, const String& /*animationKey*/, double /*time*/) { }
virtual void notifyAnimationEnded(const GraphicsLayer*, const String& /*animationKey*/) { }
// Notification that a layer property changed that requires a subsequent call to flushCompositingState()
// to appear on the screen.
virtual void notifyFlushRequired(const GraphicsLayer*) { }
// Notification that this layer requires a flush before the next display refresh.
virtual void notifyFlushBeforeDisplayRefresh(const GraphicsLayer*) { }
virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const FloatRect& /* inClip */) { }
virtual void didCommitChangesForLayer(const GraphicsLayer*) const { }
// Provides current transform (taking transform-origin and animations into account). Input matrix has been
// initialized to identity already. Returns false if the layer has no transform.
virtual bool getCurrentTransform(const GraphicsLayer*, TransformationMatrix&) const { return false; }
// Allows the client to modify a layer position used during the visibleRect calculation, for example to ignore
// scroll overhang.
virtual void customPositionForVisibleRectComputation(const GraphicsLayer*, FloatPoint&) const { }
// Multiplier for backing store size, related to high DPI.
virtual float deviceScaleFactor() const { return 1; }
// Page scale factor.
virtual float pageScaleFactor() const { return 1; }
virtual float zoomedOutPageScaleFactor() const { return 0; }
virtual float contentsScaleMultiplierForNewTiles(const GraphicsLayer*) const { return 1; }
virtual bool paintsOpaquelyAtNonIntegralScales(const GraphicsLayer*) const { return false; }
virtual bool isTrackingRepaints() const { return false; }
virtual bool shouldSkipLayerInDump(const GraphicsLayer*) const { return false; }
virtual bool shouldDumpPropertyForLayer(const GraphicsLayer*, const char*) const { return true; }
virtual bool shouldAggressivelyRetainTiles(const GraphicsLayer*) const { return false; }
virtual bool shouldTemporarilyRetainTileCohorts(const GraphicsLayer*) const { return true; }
virtual bool needsPixelAligment() const { return false; }
#ifndef NDEBUG
// RenderLayerBacking overrides this to verify that it is not
// currently painting contents. An ASSERT fails, if it is.
// This is executed in GraphicsLayer construction and destruction
// to verify that we don't create or destroy GraphicsLayers
// while painting.
virtual void verifyNotPainting() { }
#endif
};
} // namespace WebCore
#endif // GraphicsLayerClient_h
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