/* ILBM.h - O.K. the stuff to weed out differnt sections from           */
/*          an ILBM file.                                               */

#define  MakeID(a,b,c,d)   ((LONG)(a)<<24L | (LONG)(b)<<16L | (c)<<8 | (d))

#define  ID_FORM  MakeID('F','O','R','M') /* these are the abbreviations   */
#define  ID_ILBM  MakeID('I','L','B','M') /* LONG data type of all relevant*/
#define  ID_BMHD  MakeID('B','M','H','D') /* ILBM chunk descriptions       */
#define  ID_CMAP  MakeID('C','M','A','P')
#define  ID_BODY  MakeID('B','O','D','Y')
#define  ID_ACBM  MakeID('A','C','B','M')
#define  ID_ABIT  MakeID('A','B','I','T')

struct   FormHeader  {  /* these are the structure definitions for ILBM */
   ULONG Header;
   ULONG Size;
   ULONG Type;
};

struct   ChunkHeader {
   ULONG Header;
   ULONG Size;
} ;

#define  mskNone                 0  /* Masking techniques.     */
#define  mskHasMask              1
#define  mskHasTransparentColour 2
#define  mskLasso                3

#define  cmpNone                 0  /* Compression techniques  */
#define  cmpByteRun1             1

struct   BitMapHeader   {
   UWORD width,   height;        /* raster width & height in pixels     */
   WORD  x, y;                   /* pixel position for this image       */
   UBYTE nPlanes;                /* number of bit planes.               */
   UBYTE masking;                /* choice of masking technique.        */
   UBYTE compression;            /* compression type.                   */
   UBYTE pad1;                   /* unused; ignore on read, read as 0   */
   UWORD transparentColour;      /* transparent "colour no." sort of    */
   UBYTE xAspect, yAspect;       /* pixel aspect ratio width : height   */
   WORD  pageWidth, pageHeight;  /* source page size in pixels          */
};

struct   ColourRegister {        /* use this for colour information     */
   UBYTE    red, green, blue;
};

#define  OK_USE_CMAP    0        /* flags for use of colour map chunk   */
#define  NO_USE_CMAP    1        /* see ILBM.c                          */

                           /* ILBM.c functions not returning int.       */
VOID  ReadCMAP();          /* Read the colour map into store            */
VOID  ReadABIT();          /* Read an ABIT chunk of ACBM file           */
VOID  ReadBitMAPheader();  /* Self explanitory.                         */
VOID  ReadBODY();          /* To read the BODY chunk.                   */
VOID  PlainRead();         /* body with no compression                  */
VOID  ReadChunk();         /* Speaks for itself. Then decide what else  */
VOID  DumpChunk();         /* Not a useful ILBM/ACBM chunk.             */
VOID  FadeDown();          /* Fade up viewport from black to CMAP1      */
VOID  FadeUp();            /* Fade viewport from CMAP1 to black.        */
VOID  BlackoutVP();        /* make CMAP2 black and load into viewport   */
VOID  PutCMAP();           /* put CMAP1 into viewport.                  */

/* th th th that's all folks...  */