/*
 * Structures and defines for using the Dither Module.
 */

struct DitherArgs {
   short          X1, Y1;                    /* Starting corner */
   short          Width, Height;             /* Area to work on */
   short         (*CB_NewLine)               /* Called to start each line */
                  (short wid,
                   short row);
   short         (*CB_Quantize)              /* Find closest palette entry */
                  (short r, short g, short b,
                   short *qr, short *qg, short *qb);
   void          (*CB_PutLine)               /* Output a line of RGB data */
                  (UWORD *outline,
                   short xoffs,
                   short wid,
                   short row);
   LONG           Type;                      /* Type of dither (index) */
   LONG           Direction;                 /* Direction of dither (index) */
   LONG           Limit;                     /* Error limit (index) */
   short          Bits;                      /* Output color depth */
};

/* void    CB_NewLine (short width, short row) */
/* color = CB_Quantize (short r, g, b, short &qr, &qg, &qb) */
/* void    CB_PutLine (UWORD *outline, short xoffs, short wid, short row) */

#define DF_FWD             (0x0000)
#define DF_BACK            (0x8000)
#define DF_ZIGZAG          (0x4000)


#ifndef NO_DITHER_DEFINES
#define DM_NewDither       DoDither
#define DM_InitDither      InitDither
#define DM_FreeDither      FreeDither
#endif