1/*
2 * Copyright (c) 2010, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef TilingData_h
32#define TilingData_h
33
34#include "IntSize.h"
35#include <wtf/Noncopyable.h>
36
37namespace WebCore {
38
39class FloatRect;
40class IntRect;
41class IntPoint;
42
43class TilingData {
44public:
45    TilingData(const IntSize& maxTextureSize, const IntSize& totalSize, bool hasBorderTexels);
46
47    void setTotalSize(const IntSize&);
48    const IntSize& totalSize() const { return m_totalSize; }
49    void setMaxTextureSize(const IntSize&);
50    const IntSize& maxTextureSize() const { return m_maxTextureSize; }
51    void setHasBorderTexels(bool);
52    int borderTexels() const { return m_borderTexels; }
53
54    bool hasEmptyBounds() const { return !numTilesX() || !numTilesY(); }
55    int numTilesX() const { return m_numTilesX; }
56    int numTilesY() const { return m_numTilesY; }
57    int tileXIndexFromSrcCoord(int) const;
58    int tileYIndexFromSrcCoord(int) const;
59
60    IntRect tileBounds(int, int) const;
61    IntRect tileBoundsWithBorder(int, int) const;
62    int tilePositionX(int xIndex) const;
63    int tilePositionY(int yIndex) const;
64    int tileSizeX(int xIndex) const;
65    int tileSizeY(int yIndex) const;
66
67    // Difference between tileBound's and tileBoundWithBorder's location().
68    IntPoint textureOffset(int xIndex, int yIndex) const;
69
70private:
71    TilingData() : m_borderTexels(0) { }
72    void assertTile(int i, int j) const { ASSERT_UNUSED(i, i >= 0 && i < numTilesX()); ASSERT_UNUSED(j, j >= 0 && j < numTilesY()); }
73    void recomputeNumTiles();
74
75    IntSize m_maxTextureSize;
76    IntSize m_totalSize;
77    int m_borderTexels; // 0 or 1
78
79    // computed values:
80    int m_numTilesX;
81    int m_numTilesY;
82};
83
84}
85
86#endif // TilingData_h
87