workbench/classes/datatypes/gifanim/encoder.h

   1
   2 #ifndef ENCODER_H
   3 #define ENCODER_H 1
   4
   5 /*
   6 **
   7 **  $VER: encoder.h 2.2 (13.4.98)
   8 **  gifanim.datatype 2.2
   9 **
  10 **  GIF Encoder header of gifanim.datatype
  11 **
  12 **  Written 1997/1998 by Roland 'Gizzy' Mainz
  13 **  Original example source from David N. Junod
  14 **
  15 */
  16
  17 /* project includes */
  18 #include "classbase.h"
  19
  20 /* ansi includes */
  21 #include <limits.h>
  22 #include <ctype.h>
  23
  24 /*****************************************************************************/
  25
  26 /* General DEFINEs */
  27 #define HSIZE  (5003)            /* 80% occupancy */
  28
  29 /*****************************************************************************/
  30
  31 /* a code_int must be able to hold 2**BITS values of type int, and also -1 */
  32 typedef int      code_int;
  33 typedef long int count_int;
  34
  35 /*****************************************************************************/
  36
  37 /* encoder context data */
  38 struct GIFEncoder
  39 {
  40     struct ClassBase   *classbase;
  41
  42     Object             *object;
  43     struct adtFrame     loadmsg;
  44     struct BitMap      *srcbm;
  45     UBYTE              *srcchunkymap[ 2 ],
  46                        *currchunkymap;
  47     struct RastPort     rpa8tmprp;
  48     struct RastPort     rp;
  49     UWORD               whichbm; /* which source bm ? */
  50
  51     /* prefs */
  52     BOOL                interlace;
  53     WORD                backgroundpen;
  54     WORD                transparentpen;
  55
  56     /* attrs */
  57
  58     ULONG               animwidth,
  59                         animheight,
  60                         animdepth,
  61                         numcolors;
  62     ULONG               tpf;
  63     BPTR                outfile;
  64
  65     int                 Width,
  66                         Height;
  67     int                 curx,
  68                         cury;
  69     long                CountDown;
  70     int                 Pass/* = 0*/;
  71     int                 Interlace;
  72
  73     int                 n_bits;             /* number of bits/code */
  74     code_int            maxcode;            /* maximum code, given n_bits */
  75
  76     count_int           htab[ HSIZE ];
  77     unsigned short      codetab[ HSIZE ];
  78
  79     code_int            free_ent /* = 0*/;  /* first unused entry */
  80
  81     /* block compression parameters -- after all codes are used up, and compression rate changes, start over. */
  82     BOOL                clear_flg   /*  = 0*/;
  83     int                 g_init_bits;
  84     int                 ClearCode;
  85     int                 EOFCode;
  86
  87     unsigned long       cur_accum/* = 0*/;
  88              int        cur_bits/*  = 0*/;
  89
  90     char                accum[ 256 ]; /* Define the storage for the packet accumulator */
  91     int                 a_count;      /* Number of characters so far in this 'packet'  */
  92 };
  93
  94 #endif /* !ENCODER_H */
  95