/*
 * IFF.H
 *
 * Chunk:
 *       char id[4]
 *       long  cksize;
 *       uchar ckdata[cksize];
 *       [0 pad to word boundry]
 *
 * Property = Chunk
 * FORM     = Chunk / data = formtype + N-subchunks
 *
 * CAT      = Chunk / data = type + list of chunks: FORM LIST or CAT
 * LIST     = Chunk / data = type + N-Props + N(FORM LIST CAT)
 * PROP     = Chunk / data = formtype + property
 *
 *
 * ILBM  =  FORM(ILBM): BMHD [CMAP][GRAB][DEST][SPRT][CAMG][CRNG+][BODY]
 *
 */

#include <exec/types.h>


#define MAKEID(a,b,c,d) ((a)<<24 | (b)<<16 | (c)<<8 | (d))

#define IFF_FORM     MAKEID('F','O','R','M')
#define IFF_LIST     MAKEID('L','I','S','T')
#define IFF_PROP     MAKEID('P','R','O','P')
#define IFF_CAT      MAKEID('C','A','T',' ')
#define IFF_FILLER   MAKEID(' ',' ',' ',' ')

#define TYPE_ILBM    MAKEID('I','L','B','M')
#define TYPE_FTXT    MAKEID('F','T','X','T')


#define ILBM_BMHD    MAKEID('B','M','H','D')    /* PROP                */
#define ILBM_CMAP    MAKEID('C','M','A','P')    /* PROP                */
#define ILBM_GRAB    MAKEID('G','R','A','B')    /* PROP                */
#define ILBM_DEST    MAKEID('D','E','S','T')    /* PROP merging        */
#define ILBM_SPRT    MAKEID('S','P','R','T')    /* PROP body is sprite */
#define ILBM_CAMG    MAKEID('C','A','M','G')    /* PROP VP mode        */
#define ILBM_CRNG    MAKEID('C','R','N','G')    /* PROP color cycling  */
#define ILBM_BODY    MAKEID('B','O','D','Y')    /* bit mapped body     */



/* STRUCTURES */


typedef struct {
   long id;
   long cksize;
} CHUNK;


#define MA_NONE          0    /* masking */
#define MA_HASMASK       1
#define MA_HASTRANSCOLOR 2
#define MA_LASSO         3

#define CP_NONE          0    /* compression */
#define CP_BYTERUN1      1

typedef struct {
   UWORD w, h;
   WORD  x, y;
   UBYTE planes;
   UBYTE masking;
   UBYTE compression;
   UBYTE pad1;
   UWORD transparent_color;
   UBYTE xaspect, yaspect;
   WORD  pagewidth, pageheight;
} X_BMHD;

typedef UBYTE X_CMAP[3];      /* each map entry is 3 bytes  */

typedef UWORD X_GRAB[2];      /* grab entry x, y            */

typedef struct {
   UBYTE depth;
   UBYTE pad1;
   UWORD p_pick;
   UWORD p_onoff;
   UWORD p_mask;
} X_DEST;

typedef UWORD X_SPRT;         /* precedence               */

typedef struct {
   ULONG vpmodes;
} X_CAMG;

typedef struct {
   WORD  pad1;
   WORD  rate;
   WORD  active;
   UBYTE low, high;
} X_CRNG;