bmpalint.h

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// $Id: bmpalint.h 751 2006-03-31 15:43:49Z alex $
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 */
// Bitmap export palette interface class that provides an interface
// between the real palette and the sorted version of the palette

#ifndef INC_BMPALINT
#define INC_BMPALINT

/**************************************************************************************
>   class BitmapExportPaletteInterface : public CC_CLASS_MEMDUMP
    Author:     Jonathan_Payne (Xara Group Ltd) <camelotdev@xara.com>
    Created:    29/11/2000
    Purpose:    Provides an interface between the real palette and the sorted version
                of the palette
**************************************************************************************/
class BitmapExportPaletteInterface : public CC_CLASS_MEMDUMP
{
    // Declare the class for memory tracking
    CC_DECLARE_MEMDUMP(BitmapExportPaletteInterface);

private:    // Private constants
    enum {
        MAX_PALETTE_ENTRYS      = 256
    };

public:     // Public constants
    enum PaletteSortType{SORT_NONE, SORT_USE, SORT_LUMINANCE, SORT_HUE};

private:    // Data
    // Array index == value in real palette, value == value in sorted palette
    INT32 m_PaletteRealToSorted[MAX_PALETTE_ENTRYS];

    // Array index == value in sorted palette, value == value in real palette
    INT32 m_PaletteSortedToReal[MAX_PALETTE_ENTRYS];

    PaletteSortType m_CurrentSortType;

private:    // Statics
    // If this is false, we need to regenerate the arrays before using them again
    static bool m_SortedPaletteValid;

public:     // Constructors
    BitmapExportPaletteInterface();

public:     // Interface
    INT32       GetNumberOfColours();

    void            SetPaletteSortType(PaletteSortType newSortType);
    PaletteSortType GetPaletteSortType();

    BYTE    GetRed  (INT32 index);
    BYTE    GetGreen(INT32 index);
    BYTE    GetBlue (INT32 index);
    INT32       GetFlags(INT32 index);

    void    SetRed  (INT32 index, BYTE red);
    void    SetGreen(INT32 index, BYTE green);
    void    SetBlue (INT32 index, BYTE blue);
    void    SetFlags(INT32 index, INT32 flags);

    // Function to convert from a index in the sorted palette to an index in the real palette
    INT32       SortedValueToRealValue(INT32 index);
    INT32       RealValueToSortedValue(INT32 index);

public:     // Static interface
    static void InvalidateSortedPalette();

private:    // Implementation
    void ValidateSortedPalette();

private:    // Static functions (so that they can be passed to qsort)
    static INT32 LuminanceComparisonFn(const INT32 *arg1, const INT32 *arg2);
    static INT32 HueComparisonFn(const INT32 *arg1, const INT32 *arg2);
};

#endif  // INC_BMPALINT

---