pctb/structure.h

   1 /*
   2  * Image canonicalisation function for use by callers feeding
   3  *  images into structure.c's routines.
   4  */
   5 /*
   6  *  This is part of ypp-sc-tools, a set of third-party tools for assisting
   7  *  players of Yohoho Puzzle Pirates.
   8  *
   9  *  Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
  10  *
  11  *  This program is free software: you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation, either version 3 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  *
  24  *  Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
  25  *  are used without permission.  This program is not endorsed or
  26  *  sponsored by Three Rings.
  27  */
  28
  29 #ifndef STRUCTURE_H
  30 #define STRUCTURE_H
  31
  32
  33 #include "convert.h"
  34
  35
  36 typedef struct {
  37   unsigned long rgb; /* on screen */
  38   char c; /* canonical */
  39 } CanonColourInfo;
  40
  41 extern const CanonColourInfo canoncolourinfos[];
  42
  43 CanonImage *alloc_canon_image(int w, int h);
  44
  45 #define CANONICALISE_IMAGE(im,w,h, COMPUTE_RGB) do{             \
  46     /* compute_rgb should be a number of statements, or         \
  47      * a block, which assigns to                                \
  48      *   unsigned long rgb;                                     \
  49      * given the values of                                      \
  50      *   int x,y;                                               \
  51      * all of which are anamorphic.  Result is stored in im.    \
  52      * The COMPUTE_RGB is executed exactly once for             \
  53      * each pixel in reading order.                             \
  54      */                                                         \
  55     (im)= alloc_canon_image((w), (h));                          \
  56     (im)->rgb= alloc_rgb_image((w), (h));                       \
  57                                                                 \
  58     int x,y;                                                    \
  59     unsigned long last_rgb= ~0UL;                               \
  60     int last_c= -1;                                             \
  61     for (y=0; y<(h); y++) {                                     \
  62       for (x=0; x<(w); x++) {                                   \
  63         const CanonColourInfo *cci;                             \
  64         unsigned long rgb;                                      \
  65         COMPUTE_RGB;                                            \
  66         CANONIMG_ALSO_STORERGB((im)->rgb);                      \
  67         if (rgb == last_rgb) {                                  \
  68           (im)->d[y*(w) + x]= last_c;                           \
  69         } else {                                                \
  70           for (cci=canoncolourinfos; cci->c; cci++) {           \
  71             if (cci->rgb == rgb) {                              \
  72               last_rgb= rgb;                                    \
  73               (im)->d[y*(w) + x]= last_c= cci->c;               \
  74               break;                                            \
  75             }                                                   \
  76           }                                                     \
  77         }                                                       \
  78       }                                                         \
  79       if (DEBUGP(rect)) {                                       \
  80         fprintf(debug, "%4d ",y);                               \
  81         fwrite(im->d + y*(w), 1,(w), debug);                    \
  82         fputc('\n',debug);                                      \
  83       }                                                         \
  84     }                                                           \
  85     debug_flush();                                              \
  86   }while(0)
  87
  88
  89 #define CANONIMG_ALSO_STORERGB(ri)              \
  90   do{                                           \
  91     unsigned char *rip= RI_PIXEL((ri),x,y);     \
  92     rip[0]= rgb >> 16;                          \
  93     rip[1]= rgb >> 8;                           \
  94     rip[2]= rgb;                                \
  95   }while(0)
  96
  97
  98 #endif /*STRUCTURE_H*/