-#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
-