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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 BaseRenderer_h
     27 #define BaseRenderer_h
     28 
     29 #if USE(ACCELERATED_COMPOSITING)
     30 
     31 #include "Color.h"
     32 #include "SkRect.h"
     33 #include <wtf/text/StringHash.h>
     34 
     35 class SkCanvas;
     36 class SkDevice;
     37 
     38 namespace WebCore {
     39 
     40 class InstrumentedPlatformCanvas;
     41 class TextureInfo;
     42 class TilePainter;
     43 class Tile;
     44 
     45 struct TileRenderInfo {
     46     // coordinates of the tile
     47     int x;
     48     int y;
     49 
     50     // current scale factor
     51     float scale;
     52 
     53     // the expected size of the tile
     54     SkSize tileSize;
     55 
     56     // the painter object in charge of drawing our content
     57     TilePainter* tilePainter;
     58 
     59     // the base tile calling us
     60     Tile* baseTile;
     61 
     62     // info about the texture that we are to render into
     63     TextureInfo* textureInfo;
     64 
     65     bool isPureColor;
     66     Color pureColor;
     67 };
     68 
     69 /**
     70  *
     71  */
     72 class BaseRenderer {
     73 public:
     74     enum RendererType { Raster, Ganesh };
     75     BaseRenderer(RendererType type) : m_type(type) {}
     76     virtual ~BaseRenderer() {}
     77 
     78     void renderTiledContent(TileRenderInfo& renderInfo);
     79 
     80     RendererType getType() { return m_type; }
     81 
     82     static BaseRenderer* createRenderer();
     83     static void swapRendererIfNeeded(BaseRenderer*& renderer);
     84     static RendererType getCurrentRendererType() { return g_currentType; }
     85     static void setCurrentRendererType(RendererType type) { g_currentType = type; }
     86 
     87 protected:
     88 
     89     virtual void setupCanvas(const TileRenderInfo& renderInfo, SkCanvas* canvas) = 0;
     90     virtual void renderingComplete(const TileRenderInfo& renderInfo, SkCanvas* canvas) = 0;
     91     void checkForPureColor(TileRenderInfo& renderInfo, InstrumentedPlatformCanvas& canvas);
     92 
     93     // performs additional pure color check, renderInfo.isPureColor may already be set to true
     94     virtual void deviceCheckForPureColor(TileRenderInfo& renderInfo, SkCanvas* canvas) = 0;
     95 
     96     void drawTileInfo(SkCanvas* canvas, const TileRenderInfo& renderInfo,
     97             int updateCount, double renderDuration);
     98 
     99 private:
    100     RendererType m_type;
    101     static RendererType g_currentType;
    102 };
    103 
    104 } // namespace WebCore
    105 
    106 #endif // USE(ACCELERATED_COMPOSITING)
    107 #endif // BaseRenderer_h
    108