BaseRenderer.h revision 73502db10afa184358f2880c9e52906e5abc89c1 
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
35class SkCanvas;
36class SkDevice;
37
38namespace WebCore {
39
40class InstrumentedPlatformCanvas;
41class TextureInfo;
42class TilePainter;
43class Tile;
44
45struct 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 */
72class BaseRenderer {
73public:
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
87protected:
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
99private:
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