/************ I usually put these in a file called format.h ****/

#define LO_RES

#ifdef HI_RES
#define XMAX 640
#define YMAX 200
#define PLANES 4
#define MAXCOL (1<<PLANES)
#define XASPECT 5
#define YASPECT 11
#endif HI_RES

#ifdef LO_RES
#define XMAX 320
#define YMAX 200
#define PLANES 5
#define MAXCOL (1<<PLANES)
#define XASPECT 10
#define YASPECT 11
#endif LO_RES



/* EA handy make a long from 4 chars macros redone to work with Aztec */

#define MAKE_ID(a, b, c, d)\
        ( ((long)(a)<<24) + ((long)(b)<<16) + ((long)(c)<<8) + (long)(d) )



/* these are the IFF types I deal with */

#define FORM MAKE_ID('F', 'O', 'R', 'M')
#define ILBM MAKE_ID('I', 'L', 'B', 'M')
#define BMHD MAKE_ID('B', 'M', 'H', 'D')
#define CMAP MAKE_ID('C', 'M', 'A', 'P')
#define BODY MAKE_ID('B', 'O', 'D', 'Y')

/* and these are the IFF types I ignore but don't squawk about */

#define GRAB MAKE_ID('G', 'R', 'A', 'B')
#define DEST MAKE_ID('D', 'E', 'S', 'T')
#define SPRT MAKE_ID('S', 'P', 'R', 'T')
#define CAMG MAKE_ID('C', 'A', 'M', 'G')
#define CRNG MAKE_ID('C', 'R', 'N', 'G')
#define CCRT MAKE_ID('C', 'C', 'R', 'T')




        /* Some macros for raster memory allocation ... redefine if you're
                 sensible and manage memory locally */


/* ralloc - raster alloc*/

#define ralloc(amount)  (PLANEPTR)AllocMem((long)(amount), MEMF_CHIP)


/* rfree - raster free*/

#define rfree(pt, amount)      FreeMem( (pt), (long)(amount) )


/*line_bytes = the number of words * 2 (for bytes) a raster line takes up */

#define line_bytes(width)      (((width+15)>>4)<<1)


/* psize - plane size in bytes (an even number) of a raster given
   width and height */

#define psize(width, height) ( line_bytes(width)*height)


/* the place to throw excess bits */
#define bit_bucket(file, length) fseek(file, (long)(length), 1)




union bytes4
        {
        char b4_name[4];
        long b4_type;
        };



struct iff_chunk
        {
        union bytes4 iff_type;
        long iff_length;
        };


struct form_chunk
        {
        union bytes4 fc_type; /* == FORM */
        long fc_length;
        union bytes4 fc_subtype;
        };



struct BitMapHeader
        {
        UWORD w, h;
        UWORD x, y;
        UBYTE nPlanes;
        UBYTE masking;
        UBYTE compression;
        UBYTE pad1;
        UWORD transparentColor;
        UBYTE xAspect, yAspect;
        WORD pageWidth, pageHeight;
        };



/* ILBM_info is the structure read_iff returns, and is hopefully all
   you need to deal with out of the iff reader routines below */

struct ILBM_info
        {
        struct BitMapHeader header;
        UBYTE cmap[MAXCOL*3];     /*say hey aztec don't like odd length structures*/
        struct BitMap bitmap;
        };



/* I sure wish C function "prototypes" were real and not just ANSI */

extern struct ILBM_info *read_iff();     /* read_iff( char *filename ); */
extern void free_planes();               /* free_planes( struct BitMap *bitmap); */
extern int write_iff();


/* write_iff(char *name, unsigned char *colors, struct BitMap *bits,
        short xoff, short yoff, short width, short compressed); */

extern char *AllocMem();


/* Anyone know where some useful minterms are defined? */
#define COPY_MINTERM           0xc0

/***
              Meditation for the guru from the Diamond Sutra -
 
               So shall you think of all this fleeting world:
               A star at dawn, a bubble in a stream;
               A flash of lightning in a summer cloud,
               A flickering lamp, a phantom, and a dream.
***/