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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
namespace WebCore {
enum TileSizeMode {
StandardTileSizeMode,
GiantTileSizeMode
};
inline static IntSize defaultTileSize(TileSizeMode tileSizeMode = StandardTileSizeMode)
{
static const int kTiledLayerTileSize = 512;
// This is an experimental value for debugging and evaluating the overhead which may be
// incurred due to a large tile size.
static const int kGiantTiledLayerTileSize = 4096;
if (tileSizeMode == GiantTileSizeMode)
return IntSize(kGiantTiledLayerTileSize, kGiantTiledLayerTileSize);
return IntSize(kTiledLayerTileSize, kTiledLayerTileSize);
}
class FloatPoint;
class FloatRect;
class IntRect;
class PlatformCALayer;
enum ScrollingModeIndication {
SynchronousScrollingBecauseOfLackOfScrollingCoordinatorIndication,
SynchronousScrollingBecauseOfStyleIndication,
SynchronousScrollingBecauseOfEventHandlersIndication,
AsyncScrollingIndication
};
struct VelocityData {
double horizontalVelocity;
double verticalVelocity;
double scaleChangeRate;
double lastUpdateTime;
VelocityData(double horizontal = 0, double vertical = 0, double scaleChange = 0, double updateTime = 0)
: horizontalVelocity(horizontal)
, verticalVelocity(vertical)
, scaleChangeRate(scaleChange)
, lastUpdateTime(updateTime)
{
}
bool velocityOrScaleIsChanging() const
{
return horizontalVelocity || verticalVelocity || scaleChangeRate;
}
};
class TiledBacking {
public:
virtual ~TiledBacking() { }
virtual void setVisibleRect(const FloatRect&) = 0;
virtual FloatRect visibleRect() const = 0;
virtual void setCoverageRect(const FloatRect&) = 0;
virtual FloatRect coverageRect() const = 0;
virtual bool tilesWouldChangeForCoverageRect(const FloatRect&) const = 0;
virtual void setTiledScrollingIndicatorPosition(const FloatPoint&) = 0;
virtual void setTopContentInset(float) = 0;
virtual void setVelocity(const VelocityData&) = 0;
virtual void prepopulateRect(const FloatRect&) = 0;
virtual void setIsInWindow(bool) = 0;
enum {
CoverageForVisibleArea = 0,
CoverageForVerticalScrolling = 1 << 0,
CoverageForHorizontalScrolling = 1 << 1,
CoverageForScrolling = CoverageForVerticalScrolling | CoverageForHorizontalScrolling
};
typedef unsigned TileCoverage;
virtual void setTileCoverage(TileCoverage) = 0;
virtual TileCoverage tileCoverage() const = 0;
virtual void adjustTileCoverageRect(FloatRect& coverageRect, const FloatSize& newSize, const FloatRect& previousVisibleRect, const FloatRect& currentVisibleRect, float contentsScale) const = 0;
virtual IntSize tileSize() const = 0;
virtual void revalidateTiles() = 0;
virtual void forceRepaint() = 0;
virtual void setScrollingPerformanceLoggingEnabled(bool) = 0;
virtual bool scrollingPerformanceLoggingEnabled() const = 0;
virtual void setUnparentsOffscreenTiles(bool) = 0;
virtual bool unparentsOffscreenTiles() const = 0;
virtual double retainedTileBackingStoreMemory() const = 0;
virtual void setTileMargins(int marginTop, int marginBottom, int marginLeft, int marginRight) = 0;
virtual bool hasMargins() const = 0;
virtual bool hasHorizontalMargins() const = 0;
virtual bool hasVerticalMargins() const = 0;
virtual int topMarginHeight() const = 0;
virtual int bottomMarginHeight() const = 0;
virtual int leftMarginWidth() const = 0;
virtual int rightMarginWidth() const = 0;
virtual void setZoomedOutContentsScale(float) = 0;
virtual float zoomedOutContentsScale() const = 0;
// Includes margins.
virtual IntRect bounds() const = 0;
virtual IntRect boundsWithoutMargin() const = 0;
// Exposed for testing
virtual IntRect tileCoverageRect() const = 0;
virtual IntRect tileGridExtent() const = 0;
virtual void setScrollingModeIndication(ScrollingModeIndication) = 0;
#if USE(CA)
virtual PlatformCALayer* tiledScrollingIndicatorLayer() = 0;
#endif
};
} // namespace WebCore
#endif // TiledBacking_h
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