osx man page for set_blender_mode_ex

set_blender_mode_ex(3alleg4)					  Allegro manual				      set_blender_mode_ex(3alleg4)

NAME

       set_blender_mode_ex - An even more complex version of set_blender_mode(). Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void set_blender_mode_ex(BLENDER_FUNC b15, b16, b24, b32, b15x, b16x, b24x, int r, g, b, a);

DESCRIPTION

       Like  set_blender_mode(),  but  allows you to specify a more complete set of blender routines. The b15, b16, b24, and b32 routines are used
       when  drawing  pixels  onto  destinations  of  the  same  format,  while  b15x,	b16x,  and  b24x  are  used  by  draw_trans_sprite()   and
       draw_trans_rle_sprite()	when  drawing  RGBA  images  onto  destination bitmaps of another format. These blenders will be passed a 32-bit x
       parameter, along with a y value of a different color depth, and must try to do something sensible in response.

SEE ALSO

       set_blender_mode(3alleg4), set_alpha_blender(3alleg4)

Allegro 							   version 4.4.2				      set_blender_mode_ex(3alleg4)