WIP actual useful structure

[ypp-sc-tools.main.git] / pctb / structure.h

diff --git a/pctb/structure.h b/pctb/structure.h
new file mode 100644 (file)
index 0000000..10de443
--- /dev/null
+++ b/pctb/structure.h
@@ -0,0 +1,57 @@
+#ifndef STRUCTURE_H
+#define STRUCTURE_H
+
+
+#include "convert.h"
+
+
+typedef struct {
+  unsigned long rgb; /* on screen */
+  char c; /* canonical */
+} CanonColourInfo;
+
+extern const CanonColourInfo canoncolourinfos[];
+
+CanonImage *alloc_canon_image(int w, int h);
+
+#ifdef DEBUG_RECTANGLES
+# define CANIMG_DEBUG_RECTANGLE_1LINE(im,w,h)  \
+      fprintf(debug, "%4d ",y);                        \
+      int r= fwrite(im->d + y*w, 1,w, debug);  \
+      eassert(r==w);                           \
+      fputc('\n',debug);
+#else
+# define CANIMG_DEBUG_RECTANGLE_1LINE(im,y,h) /* nothing */
+#endif
+
+#define CANONICALISE_IMAGE(im,w,h, COMPUTE_RGB) do{            \
+    /* compute_rgb should be a number of statements, or                \
+     * a block, which assigns to                               \
+     *   unsigned long rgb;                                    \
+     * given the values of                                     \
+     *   int x,y;                                              \
+     * all of which are anamorphic.  Result is stored in im.   \
+     * The COMPUTE_RGB is executed exactly once for            \
+     * each pixel in reading order.                            \
+     */                                                                \
+    (im)= alloc_canon_image((w), (h));                         \
+                                                               \
+    int x,y;                                                   \
+    for (y=0; y<(h); y++) {                                    \
+      for (x=0; x<(w); x++) {                                  \
+        const CanonColourInfo *cci;                            \
+        unsigned long rgb;                                     \
+       COMPUTE_RGB;                                            \
+       for (cci=canoncolourinfos; cci->c; cci++)               \
+         if (cci->rgb == rgb) {                                \
+           (im)->d[y*(w) + x]= cci->c;                         \
+           break;                                              \
+         }                                                     \
+      }                                                                \
+      CANIMG_DEBUG_RECTANGLE_1LINE((im),(w),(h))               \
+    }                                                          \
+    debug_flush();                                             \
+  }while(0)
+
+
+#endif /*STRUCTURE_H*/