set_write_alpha_blender(3) - Linux man page
Name
set_write_alpha_blender - Enables the special alpha-channel editing mode. Allegro game programming library.
Synopsis
#include <allegro.h>
void set_write_alpha_blender();
Description
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
makeacol(3),
makeacol32(3),
set_trans_blender(3)