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/*
* Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``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 ITS 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 TiledBacking_h
#define TiledBacking_h
#if PLATFORM(MAC)
OBJC_CLASS CALayer;
#endif
namespace WebCore {
class IntRect;
enum ScrollingModeIndication {
MainThreadScrollingBecauseOfStyleIndication,
MainThreadScrollingBecauseOfEventHandlersIndication,
ThreadedScrollingIndication
};
class TiledBacking {
public:
virtual ~TiledBacking() { }
virtual void setVisibleRect(const FloatRect&) = 0;
virtual FloatRect visibleRect() const = 0;
virtual bool tilesWouldChangeForVisibleRect(const FloatRect&) const = 0;
virtual void setExposedRect(const FloatRect&) = 0;
virtual void setClipsToExposedRect(bool) = 0;
virtual bool clipsToExposedRect() = 0;
virtual void prepopulateRect(const FloatRect&) = 0;
virtual void setIsInWindow(bool) = 0;
enum {
CoverageForVisibleArea = 0,
CoverageForVerticalScrolling = 1 << 0,
CoverageForHorizontalScrolling = 1 << 1,
CoverageForSlowScrolling = 1 << 2, // Indicates that we expect to paint a lot on scrolling.
CoverageForScrolling = CoverageForVerticalScrolling | CoverageForHorizontalScrolling
};
typedef unsigned TileCoverage;
virtual void setTileCoverage(TileCoverage) = 0;
virtual TileCoverage tileCoverage() const = 0;
virtual IntSize tileSize() const = 0;
virtual void forceRepaint() = 0;
virtual void setScrollingPerformanceLoggingEnabled(bool) = 0;
virtual bool scrollingPerformanceLoggingEnabled() const = 0;
virtual void setAggressivelyRetainsTiles(bool) = 0;
virtual bool aggressivelyRetainsTiles() const = 0;
virtual void setUnparentsOffscreenTiles(bool) = 0;
virtual bool unparentsOffscreenTiles() const = 0;
virtual double retainedTileBackingStoreMemory() const = 0;
// Exposed for testing
virtual IntRect tileCoverageRect() const = 0;
virtual IntRect tileGridExtent() const = 0;
virtual void setScrollingModeIndication(ScrollingModeIndication) = 0;
#if PLATFORM(MAC)
virtual CALayer *tiledScrollingIndicatorLayer() = 0;
#endif
};
} // namespace WebCore
#endif // TiledBacking_h
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