al_set_bitmap_blender - Man Page

#include <allegro5/allegro.h>

void al_set_bitmap_blender(int op, int src, int dest)

Sets the function to use for blending when rendering to the target bitmap. If no blender is set for a given bitmap at draw time, the values set for al_set_blender(3)/al_set_separate_blender(3) are used instead.

To use separate functions for chroma (RGB) and alpha channels, use al_set_separate_bitmap_blender(3).

See al_set_blender(3) for more information about how blending works.

al_set_separate_bitmap_blender(3), al_reset_bitmap_blender(3)

5.2.5

al_get_bitmap_blender(3), al_reset_bitmap_blender(3), al_set_bitmap_blend_color(3), al_set_separate_bitmap_blender(3).