#ifndef TiledBacking_h
#define TiledBacking_h
namespace WebCore {
static const int defaultTileWidth = 512;
static const int defaultTileHeight = 512;
class IntRect;
class PlatformCALayer;
enum ScrollingModeIndication {
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 FloatRect computeTileCoverageRect(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;
virtual IntRect bounds() const = 0;
virtual IntRect boundsWithoutMargin() const = 0;
virtual IntRect tileCoverageRect() const = 0;
virtual IntRect tileGridExtent() const = 0;
virtual void setScrollingModeIndication(ScrollingModeIndication) = 0;
#if USE(CA)
virtual PlatformCALayer* tiledScrollingIndicatorLayer() = 0;
#endif
};
}
#endif // TiledBacking_h