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
34namespace WebCore {
35
36class Color;
37class GLWebViewState;
38class Tile;
39class TilePainter;
40class TransformationMatrix;
41
42class TileGrid {
43public:
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
73private:
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