Converts RGBA colors into display dependent pixel formats.
Convert RGBA colors into display dependent pixel formats. In anything
less than a 32-bit mode, these are the same as calling makecol() or
makecol_depth(), but by using these routines it is possible to create
32-bit color values that contain a true 8 bit alpha channel along with
the red, green, and blue components. You should only use RGBA format
colors as the input to draw_trans_sprite() or draw_trans_rle_sprite()
after calling set_alpha_blender(), rather than drawing them directly to
Returns the requested RGBA quadruplet.
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