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vtDIB.h

//
// vtDIB.h
//
// Copyright (c) 2001 Virtual Terrain Project
// Free for all uses, see license.txt for details.
//

#ifndef VTDATA_DIBH
#define VTDATA_DIBH

// for non-Win32 systems (or code which does include the Win32 headers),
// define some Microsoft types used by the DIB code
#ifdef _WINGDI_

typedef DWORD dword;

#else

typedef unsigned long dword;
typedef unsigned short word;
typedef unsigned char byte;

#if WIN32
#include <pshpack2.h>
#endif

#ifdef __GNUC__
#  define PACKED __attribute__((packed))
#else
#  define PACKED
#endif

typedef struct tagBITMAPFILEHEADER {
    word    bfType;
    dword   bfSize;
    word    bfReserved1;
    word    bfReserved2;
    dword   bfOffBits;
} PACKED BITMAPFILEHEADER;
#if WIN32
#include <poppack.h>
#endif

typedef struct tagBITMAPINFOHEADER{
    dword   biSize;
    long    biWidth;
    long    biHeight;
    word    biPlanes;
    word    biBitCount;
    dword   biCompression;
    dword   biSizeImage;
    long    biXPelsPerMeter;
    long    biYPelsPerMeter;
    dword   biClrUsed;
    dword   biClrImportant;
} PACKED BITMAPINFOHEADER;

typedef struct tagRGBQUAD {
    byte    rgbBlue;
    byte    rgbGreen;
    byte    rgbRed;
    byte    rgbReserved;
} PACKED RGBQUAD;

/* constants for the biCompression field */
#define BI_RGB        0L
#define BI_RLE8       1L
#define BI_RLE4       2L
#define BI_BITFIELDS  3L

#define RGB(r,g,b)          ((dword)(((byte)(r)|((word)((byte)(g))<<8))|(((dword)(byte)(b))<<16)))

#define GetRValue(rgb)      ((byte)(rgb))
#define GetGValue(rgb)      ((byte)(((word)(rgb)) >> 8))
#define GetBValue(rgb)      ((byte)((rgb)>>16))

#endif // #ifndef _WINGDI_


class vtDIB
{
public:
    vtDIB();
    vtDIB(const char *fname);       // load new DIB from file
    vtDIB(int width, int height, int bitdepth, bool create_palette);    // create new DIB
    vtDIB(void *pDIB);              // wrap an existing DIB
    ~vtDIB();

    bool ReadBMP(const char *fname);
    bool WriteBMP(const char *fname);
//  bool ReadPNG(const char *filename);

    unsigned long GetPixel24(int x, int y);
    void SetPixel24(int x, int y, dword color);

    unsigned char GetPixel8(int x, int y);
    void SetPixel8(int x, int y, byte color);

    bool GetPixel1(int x, int y);
    void SetPixel1(int x, int y, bool color);

    int GetWidth() { return m_iWidth; }
    int GetHeight() { return m_iHeight; }
    int GetDepth() { return m_iBitCount; }

    void *GetHandle() { return m_pDIB; }
    BITMAPINFOHEADER *GetDIBHeader() { return m_Hdr; }
    void *GetDIBData() { return m_Data; }

    void Lock();
    void Unlock();
    void LeaveInternalDIB(bool bLeaveIt);

    bool    m_bLoadedSuccessfully;

private:
    void ComputeByteWidth();

    bool    m_bLeaveIt;

    // When locked, these two fields point to the header and data
    BITMAPINFOHEADER *m_Hdr;
    void    *m_Data;

    void    *m_pDIB;
    int     m_iWidth, m_iHeight, m_iBitCount;
    int     m_iByteWidth;
    int     m_iPaletteSize;
};

#endif

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