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/*
* Copyright 2011, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 SurfaceBacking_h
#define SurfaceBacking_h
#include "SkRefCnt.h"
#include "TileGrid.h"
namespace WebCore {
class LayerAndroid;
class TexturesResult;
class TilePainter;
class SurfaceBacking : public SkRefCnt {
// TODO: investigate webkit threadsafe ref counting
public:
SurfaceBacking(bool isBaseSurface);
~SurfaceBacking();
void prepareGL(GLWebViewState* state, float maxZoomScale,
const IntRect& prepareArea, const IntRect& fullContentArea,
TilePainter* painter, bool aggressiveRendering,
bool updateWithBlit);
bool swapTiles();
void drawGL(const IntRect& visibleContentArea, float opacity,
const TransformationMatrix* transform, bool aggressiveRendering,
const Color* background);
void markAsDirty(const SkRegion& dirtyArea);
void computeTexturesAmount(TexturesResult* result,
const IntRect& visibleContentArea,
const IntRect& fullContentArea,
LayerAndroid* layer);
void discardTextures()
{
m_frontTileGrid->discardTextures();
m_backTileGrid->discardTextures();
}
bool isReady()
{
return !m_zooming && m_frontTileGrid->isReady() && m_scale > 0;
}
bool isDirty()
{
return m_frontTileGrid->isDirty();
}
bool isMissingContent()
{
return m_zooming || m_frontTileGrid->isMissingContent();
}
int nbTextures(IntRect& area, float scale)
{
// TODO: consider the zooming case for the backTileGrid
if (!m_frontTileGrid)
return 0;
return m_frontTileGrid->nbTextures(area, scale);
}
private:
void swapTileGrids();
// Delay before we schedule a new tile at the new scale factor
static const double s_zoomUpdateDelay = 0.1; // 100 ms
TileGrid* m_frontTileGrid;
TileGrid* m_backTileGrid;
TileGrid* m_lowResTileGrid;
float m_scale;
float m_futureScale;
double m_zoomUpdateTime;
bool m_zooming;
float m_maxZoomScale;
};
} // namespace WebCore
#endif // SurfaceBacking_h
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