* Ok, invert works. OK OK SAM THAT WAS MY FAULT

AHAHAH                      _
    _._ _..._ .-',     _.._(`))
   '-. `     '  /-._.-'    ',/
      ) MAIS    \            '.
     / _    _    |  JE         \
    |  a    a    /     SUIS     |
    \   .-.                     ;  
     '-('' ).-'       ,' UN    ;
        '-;           |      .'
           \    VIEUX  \    /
           | 7  .__  _.-\   \
           | |  |  ``/  /`  /
          /,_|  |   /,_/   /
             /,_/      '`-'

POOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOORC!

cucul/bitmap.c

@@ -803,7 +803,7 @@ void cucul_draw_bitmap(cucul_t *qq, int x1, int y1, int x2, int y2,
 
         if(bitmap->invert) {
             outfg = 15-outfg;
-            outbg = 15-outfg;
+            outbg = 15-outbg;
         }
 
         /* Now output the character */