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/*
* Copyright 2010, 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 TiledPage_h
#define TiledPage_h
#if USE(ACCELERATED_COMPOSITING)
#include "BaseTile.h"
#include "SkCanvas.h"
#include "SkRegion.h"
namespace WebCore {
class GLWebViewState;
class IntRect;
/**
* The TiledPage represents a map of BaseTiles covering the viewport. Each
* GLWebViewState contains two TiledPages, one to display the page at the
* current scale factor, and another in the background that we use to paint the
* page at a different scale factor. For instance, when we zoom using one
* TiledPage its tiles are scaled in hardware and therefore are subject to a
* loss of quality. To address this when the user finishes zooming we paint the
* background TilePage at the new scale factor. When the background TilePage is
* ready, we swap it with the currently displaying TiledPage.
*/
class TiledPage {
public:
TiledPage(int id, GLWebViewState* state);
~TiledPage();
// returns the other TiledPage who shares the same GLWebViewState
TiledPage* sibling();
// prepare the page for display on the screen
void prepare(bool goingDown, bool goingLeft, const SkIRect& tileBounds);
// check to see if the page is ready for display
bool ready(const SkIRect& tileBounds, float scale);
// draw the page on the screen
void draw(float transparency, const SkIRect& tileBounds);
// used by individual tiles to generate the bitmap for their tile
unsigned int paintBaseLayerContent(SkCanvas*);
// used by individual tiles to get the information about the current picture
GLWebViewState* glWebViewState() { return m_glWebViewState; }
float scale() const { return m_scale; }
void setScale(float scale) { m_scale = scale; m_invScale = 1 / scale; }
void invalidateRect(const IntRect& invalRect, const unsigned int pictureCount);
void setUsable(bool usable);
void updateBaseTileSize();
bool scrollingDown() { return m_scrollingDown; }
SkIRect* expandedTileBounds() { return &m_expandedTileBounds; }
private:
void updateTileState(const SkIRect& tileBounds);
void prepareRow(bool goingLeft, int tilesInRow, int firstTileX, int y, const SkIRect& tileBounds);
void updateTileUsedLevel(const SkIRect& tileBounds, BaseTile& tile);
BaseTile* getBaseTile(int x, int y) const;
// array of tiles used to compose a page. The tiles are allocated in the
// constructor to prevent them from potentially being allocated on the stack
BaseTile* m_baseTiles;
// stores the number of tiles in the m_baseTiles array. This enables us to
// quickly iterate over the array without have to check it's size
int m_baseTileSize;
int m_id;
float m_scale;
float m_invScale;
GLWebViewState* m_glWebViewState;
// used to identify the tiles that have been invalidated (marked dirty) since
// the last time updateTileState() has been called. The region is stored in
// terms of the (x,y) coordinates used to determine the location of the tile
// within the page, not in content/view pixel coordinates.
SkRegion m_invalRegion;
// inval regions in content coordinates
SkRegion m_invalTilesRegion;
unsigned int m_latestPictureInval;
bool m_prepare;
bool m_scrollingDown;
SkIRect m_expandedTileBounds;
};
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // TiledPage_h
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