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


       #include <allegro.h>

       Example exalpha


       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.


       BITMAP(3alleg4),      END_OF_MAIN(3alleg4),      SCREEN_H(3alleg4),     SCREEN_W(3alleg4),
       allegro_error(3alleg4),  allegro_init(3alleg4),  allegro_message(3alleg4),  blit(3alleg4),
       clear_keybuf(3alleg4),           create_bitmap(3alleg4),          destroy_bitmap(3alleg4),
       draw_trans_sprite(3alleg4),    drawing_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)