makeacol_depth (3) - Linux Manuals

makeacol_depth: Converts RGBA colors into display dependent pixel formats. Allegro game programming library.

NAME

makeacol, makeacol_depth - Converts RGBA colors into display dependent pixel formats. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

int makeacol(int r, int g, int b, int a);

int makeacol_depth(int color_depth, int r, int g, int b, int a);

DESCRIPTION

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 the screen.

RETURN VALUE

Returns the requested RGBA quadruplet.