osx man page for exalpha

exalpha(3alleg4)						  Allegro manual						  exalpha(3alleg4)

NAME

       exalpha - Creating and using 32 bit RGBA sprites. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       Example exalpha

DESCRIPTION

       This  program  demonstrates  how  to use the 32 bit RGBA translucency functions to store an alpha channel along with a bitmap graphic.  Two
       images are loaded from disk. One will be used for the background and the other as a sprite. The example generates an alpha channel for  the
       sprite image, composing the 32 bit RGBA bitmap during runtime, and draws it at the position of the mouse cursor.

SEE ALSO

       BITMAP(3alleg4),  END_OF_MAIN(3alleg4),	SCREEN_H(3alleg4),  SCREEN_W(3alleg4), allegro_error(3alleg4), allegro_init(3alleg4), allegro_mes-
       sage(3alleg4), blit(3alleg4), clear_keybuf(3alleg4),  create_bitmap(3alleg4),  destroy_bitmap(3alleg4),	draw_trans_sprite(3alleg4),  draw-
       ing_mode(3alleg4),    font(3alleg4),    getb(3alleg4),	 getg(3alleg4),   getpixel(3alleg4),   getr(3alleg4),	install_keyboard(3alleg4),
       install_mouse(3alleg4),	 install_timer(3alleg4),   keypressed(3alleg4),    load_bitmap(3alleg4),    makecol(3alleg4),	 mouse_x(3alleg4),
       mouse_y(3alleg4),    putpixel(3alleg4),	  rectfill(3alleg4),   replace_filename(3alleg4),   screen(3alleg4),   set_alpha_blender(3alleg4),
       set_color_conversion(3alleg4),	       set_color_depth(3alleg4),	   set_gfx_mode(3alleg4),	    set_multiply_blender(3alleg4),
       set_write_alpha_blender(3alleg4), solid_mode(3alleg4), stretch_blit(3alleg4), textprintf_ex(3alleg4)

Allegro 							   version 4.4.2						  exalpha(3alleg4)