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 #ifdef DEBUG_RECTANGLES
  18 # define CANIMG_DEBUG_RECTANGLE_1LINE(im,w,h)   \
  19       fprintf(debug, "%4d ",y);                 \
  20       int r= fwrite(im->d + y*w, 1,w, debug);   \
  21       eassert(r==w);                            \
  22       fputc('\n',debug);
  23 #else
  24 # define CANIMG_DEBUG_RECTANGLE_1LINE(im,y,h) /* nothing */
  25 #endif
  26
  27 #define CANONICALISE_IMAGE(im,w,h, COMPUTE_RGB) do{             \
  28     /* compute_rgb should be a number of statements, or         \
  29      * a block, which assigns to                                \
  30      *   unsigned long rgb;                                     \
  31      * given the values of                                      \
  32      *   int x,y;                                               \
  33      * all of which are anamorphic.  Result is stored in im.    \
  34      * The COMPUTE_RGB is executed exactly once for             \
  35      * each pixel in reading order.                             \
  36      */                                                         \
  37     (im)= alloc_canon_image((w), (h));                          \
  38                                                                 \
  39     int x,y;                                                    \
  40     for (y=0; y<(h); y++) {                                     \
  41       for (x=0; x<(w); x++) {                                   \
  42         const CanonColourInfo *cci;                             \
  43         unsigned long rgb;                                      \
  44         COMPUTE_RGB;                                            \
  45         for (cci=canoncolourinfos; cci->c; cci++)               \
  46           if (cci->rgb == rgb) {                                \
  47             (im)->d[y*(w) + x]= cci->c;                         \
  48             break;                                              \
  49           }                                                     \
  50       }                                                         \
  51       CANIMG_DEBUG_RECTANGLE_1LINE((im),(w),(h))                \
  52     }                                                           \
  53     debug_flush();                                              \
  54   }while(0)
  55
  56
  57 #endif /*STRUCTURE_H*/