This function can be used to toggle alpha-blending on and off. Basically, if you have this set to false, all images being drawn will be drawn 100% opaque, meaning that any transparent, or semi transparent, areas of a sprite or background will be visible as a solid colour. It is a good idea to have alpha blending off whenever possible (especially when developing for mobile devices) as this greatly increases the draw speed.
|enable||Enable or disable alpha blending value (true or false).|
draw_sprite(spr_Background, 0, 0, 0);
The above code switches off alpha blending to draw a background sprite and then switches it back on again to continue drawing.