TilingData.h   [plain text]

/*
 * Copyright (c) 2010, Google Inc. All rights reserved.
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
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#ifndef TilingData_h
#define TilingData_h

#include <wtf/Noncopyable.h>

namespace WebCore {

class FloatRect;
class IntRect;
class IntPoint;

class TilingData {
public:
    TilingData(int maxTextureSize, int totalSizeX, int totalSizeY, bool hasBorderTexels);
    void setTotalSize(int totalSizeX, int totalSizeY);
    void setMaxTextureSize(int);
    int maxTextureSize() const { return m_maxTextureSize; }
    int totalSizeX() const { return m_totalSizeX; }
    int totalSizeY() const { return m_totalSizeY; }
    void setHasBorderTexels(bool);
    int borderTexels() const { return m_borderTexels; }

    bool hasEmptyBounds() const { return !numTilesX() || !numTilesY(); }
    int numTilesX() const { return m_numTilesX; }
    int numTilesY() const { return m_numTilesY; }
    int tileXIndexFromSrcCoord(int) const;
    int tileYIndexFromSrcCoord(int) const;

    IntRect tileBounds(int, int) const;
    IntRect tileBoundsWithBorder(int, int) const;
    FloatRect tileBoundsNormalized(int, int) const;
    int tilePositionX(int xIndex) const;
    int tilePositionY(int yIndex) const;
    int tileSizeX(int xIndex) const;
    int tileSizeY(int yIndex) const;
    IntRect overlappedTileIndices(const IntRect& srcRect) const;
    IntRect overlappedTileIndices(const FloatRect& srcRect) const;

    // Difference between tileBound's and tileBoundWithBorder's location().
    IntPoint textureOffset(int xIndex, int yIndex) const;

private:
    TilingData() : m_maxTextureSize(0), m_totalSizeX(0), m_totalSizeY(0) {}
    void assertTile(int i, int j) const { ASSERT_UNUSED(i, i >= 0 && i < numTilesX()); ASSERT_UNUSED(j, j >= 0 && j < numTilesY()); }
    void recomputeNumTiles();

    int m_maxTextureSize;
    int m_totalSizeX;
    int m_totalSizeY;
    int m_borderTexels; // 0 or 1

    // computed values:
    int m_numTilesX;
    int m_numTilesY;
};

}

#endif // TilingData_h