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      1 /*
      2  * Copyright 2011, The Android Open Source Project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef TileGrid_h
     27 #define TileGrid_h
     28 
     29 #include "IntRect.h"
     30 #include "SkRegion.h"
     31 
     32 #include <wtf/Vector.h>
     33 
     34 namespace WebCore {
     35 
     36 class Color;
     37 class GLWebViewState;
     38 class Tile;
     39 class TilePainter;
     40 class TransformationMatrix;
     41 
     42 class TileGrid {
     43 public:
     44     enum PrepareRegionFlags { EmptyRegion = 0x0, StandardRegion = 0x1, ExpandedRegion = 0x2 };
     45 
     46     TileGrid(bool isBaseSurface);
     47     virtual ~TileGrid();
     48 
     49     static IntRect computeTilesArea(const IntRect& contentArea, float scale);
     50 
     51     void prepareGL(GLWebViewState* state, float scale,
     52                    const IntRect& prepareArea, const IntRect& fullContentArea,
     53                    TilePainter* painter, int regionFlags = StandardRegion,
     54                    bool isLowResPrefetch = false, bool updateWithBlit = false);
     55     bool swapTiles();
     56     void drawGL(const IntRect& visibleContentArea, float opacity,
     57                 const TransformationMatrix* transform, const Color* background = 0);
     58 
     59     void markAsDirty(const SkRegion& dirtyArea);
     60 
     61     Tile* getTile(int x, int y);
     62 
     63     void removeTiles();
     64     void discardTextures();
     65 
     66     bool isReady();
     67     bool isMissingContent();
     68     bool isDirty() { return !m_dirtyRegion.isEmpty(); }
     69 
     70     int nbTextures(const IntRect& area, float scale);
     71     unsigned int getImageTextureId();
     72 
     73 private:
     74     void prepareTile(int x, int y, TilePainter* painter,
     75                      GLWebViewState* state, bool isLowResPrefetch,
     76                      bool isExpandPrefetch, bool shouldTryUpdateWithBlit);
     77     void drawMissingRegion(const SkRegion& region, float opacity, const Color* tileBackground);
     78     bool tryBlitFromContents(Tile* tile, TilePainter* painter);
     79 
     80     WTF::Vector<Tile*> m_tiles;
     81 
     82     IntRect m_area;
     83 
     84     SkRegion m_dirtyRegion;
     85 
     86     int m_prevTileY;
     87     float m_scale;
     88 
     89     bool m_isBaseSurface;
     90 };
     91 
     92 } // namespace WebCore
     93 
     94 #endif // TileGrid_h
     95