set_write_alpha_blender man page

set_write_alpha_blender — Enables the special alpha-channel editing mode. Allegro game programming library.


#include <allegro.h>

void set_write_alpha_blender();


Enables the special alpha-channel editing mode, which is used for drawing alpha channels over the top of an existing 32-bit RGB sprite, to turn it into an RGBA format image. After calling this function, you can set the drawing mode to DRAW_MODE_TRANS and then write draw color values (0-255) onto a 32-bit image. This will leave the color values unchanged, but alter the alpha to whatever values you are writing. After enabling this mode you can also use draw_trans_sprite() to superimpose an 8-bit alpha mask over the top of an existing 32-bit sprite.

See Also

set_alpha_blender(3), draw_trans_sprite(3), drawing_mode(3), exalpha(3), extrans(3)

Referenced By

draw_trans_sprite(3), exalpha(3), extrans(3), makeacol(3), makeacol32(3), set_alpha_blender(3), set_trans_blender(3).

Explore man page connections for set_write_alpha_blender(3).

Allegro version 4.4.2 Allegro manual