1exalpha(3) Allegro manual exalpha(3)
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6 exalpha - Creating and using 32 bit RGBA sprites. Allegro game program‐
7 ming library.
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10 #include <allegro.h>
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13 Example exalpha
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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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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 4.2.2 exalpha(3)