guchar *m;
guchar s_color[MAX_CHANNELS];
guchar diff;
gint col_bytes = bytes;;
gint col_bytes;
Tile *s_tile = NULL;
Tile *m_tile = NULL;
col_bytes = bytes;
ref_tiles (src->tiles, mask->tiles,
&s_tile, &m_tile, src->x, src->y, &s, &m);