pctb/structure.h

   1 #ifndef STRUCTURE_H
   2 #define STRUCTURE_H
   3
   4
   5 #include "convert.h"
   6
   7
   8 typedef struct {
   9   unsigned long rgb; /* on screen */
  10   char c; /* canonical */
  11 } CanonColourInfo;
  12
  13 extern const CanonColourInfo canoncolourinfos[];
  14
  15 CanonImage *alloc_canon_image(int w, int h);
  16
  17 #define CANONICALISE_IMAGE(im,w,h, COMPUTE_RGB) do{             \
  18     /* compute_rgb should be a number of statements, or         \
  19      * a block, which assigns to                                \
  20      *   unsigned long rgb;                                     \
  21      * given the values of                                      \
  22      *   int x,y;                                               \
  23      * all of which are anamorphic.  Result is stored in im.    \
  24      * The COMPUTE_RGB is executed exactly once for             \
  25      * each pixel in reading order.                             \
  26      */                                                         \
  27     (im)= alloc_canon_image((w), (h));                          \
  28                                                                 \
  29     int x,y;                                                    \
  30     for (y=0; y<(h); y++) {                                     \
  31       for (x=0; x<(w); x++) {                                   \
  32         const CanonColourInfo *cci;                             \
  33         unsigned long rgb;                                      \
  34         COMPUTE_RGB;                                            \
  35         for (cci=canoncolourinfos; cci->c; cci++) {             \
  36           if (cci->rgb == rgb) {                                \
  37             (im)->d[y*(w) + x]= cci->c;                         \
  38             break;                                              \
  39           }                                                     \
  40         }                                                       \
  41       }                                                         \
  42       if (DEBUGP(rect)) {                                       \
  43         fprintf(debug, "%4d ",y);                               \
  44         fwrite(im->d + y*w, 1,w, debug);                        \
  45         fputc('\n',debug);                                      \
  46       }                                                         \
  47     }                                                           \
  48     debug_flush();                                              \
  49   }while(0)
  50
  51
  52 #endif /*STRUCTURE_H*/