src/libUnuk/ImageLoader.h

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// ===================================================================
// This image loader will read in a 32-bit bitmap.
// ===================================================================

#ifndef _IMAGELOADER_H_
#define _IMAGELOADER_H_

typedef unsigned char   BYTE;
typedef int             LONG;
typedef unsigned int    DWORD;
typedef unsigned short  WORD;

// Provides general information about the file.
typedef struct __attribute__ ((__packed__)) tagBITMAPFILEHEADER {
  WORD  bfType;
  DWORD bfSize;
  WORD  bfReserved1;
  WORD  bfReserved2;
  DWORD bfOffBits;
} BITMAPFILEHEADER, *PBITMAPFILEHEADER;

// The information header provides information specific to the image data.
typedef struct __attribute__ ((__packed__)) tagBITMAPINFOHEADER {
  DWORD biSize;
  LONG  biWidth;
  LONG  biHeight;
  WORD  biPlanes;
  WORD  biBitCount;
  DWORD biCompression;
  DWORD biSizeImage;
  DWORD biXPelsPerMeter;
  DWORD biYPelsPerMeter;
  DWORD biCLRUsed;
  DWORD biCLRImportant;
} BITMAPINFOHEADER, *PBITAPINFOHEADER;

// Color palette.
typedef struct __attribute__ ((__packed__)) tagRGBQUAD {
  BYTE rbgBlue;
  BYTE rgbGreen;
  BYTE rgbRed;
  BYTE rgbReserved;
} RGBQUAD;

class ImageLoader {
public:
  ImageLoader(void);
  ImageLoader(const char *filename);

  virtual ~ImageLoader(void);
  
  bool LoadBMP(const char *filename);
  BYTE *GetAlpha(void) const;
  
  LONG     GetHeight(void)      const { return height;    }
  RGBQUAD  *GetColors(void)     const { return colors;    }
  bool     GetLoaded(void)      const { return loaded;    }
  BYTE     *GetPixelData(void)  const { return pixelData; }
  LONG     GetWidth(void)       const { return width;     }

private:
  BITMAPFILEHEADER  bmfh;
  BITMAPINFOHEADER  bmih;
  RGBQUAD           *colors;
  BYTE              *pixelData;
  bool              loaded;
  LONG              width;
  LONG              height;
  WORD              bpp;

  // Private methods.
  void Reset(void);
  bool FixPadding(BYTE const * const tempPixelData, DWORD size);
};

#endif