1exalpha(3)                      Allegro manual                      exalpha(3)
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NAME

6       exalpha - Creating and using 32 bit RGBA sprites. Allegro game program‐
7       ming library.
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SYNOPSIS

10       #include <allegro.h>
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13       Example exalpha
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DESCRIPTION

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

25       BITMAP(3),  END_OF_MAIN(3), SCREEN_H(3), SCREEN_W(3), allegro_error(3),
26       allegro_init(3),  allegro_message(3),  blit(3),  clear_keybuf(3),  cre‐
27       ate_bitmap(3),     destroy_bitmap(3),    draw_trans_sprite(3),    draw‐
28       ing_mode(3),   font(3),   getb(3),   getg(3),   getpixel(3),   getr(3),
29       install_keyboard(3), install_mouse(3), install_timer(3), keypressed(3),
30       load_bitmap(3), makecol(3), mouse_x(3), mouse_y(3), putpixel(3),  rect‐
31       fill(3),    replace_filename(3),    screen(3),    set_alpha_blender(3),
32       set_color_conversion(3), set_color_depth(3), set_gfx_mode(3),  set_mul‐
33       tiply_blender(3),       set_write_alpha_blender(3),      solid_mode(3),
34       stretch_blit(3), textprintf_ex(3)
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38Allegro                          version 4.2.3                      exalpha(3)