getr_depth(3) Allegro manual getr_depth(3)NAME
getr_depth, getg_depth, getb_depth, geta_depth - Extract a color compo‐
nent from a color in a specified pixel format. Allegro game programming
library.
SYNOPSIS
#include <allegro.h>
int getr_depth(int color_depth, int c);
int getg_depth(int color_depth, int c);
int getb_depth(int color_depth, int c);
int geta_depth(int color_depth, int c);
DESCRIPTION
Given a color in the format being used by the specified color depth,
these functions extract one of the red, green, blue, or alpha compo‐
nents (ranging 0-255). The alpha part is only meaningful for 32-bit
pixels. Example:
int r, g, b, color_value, bpp;
bpp = bitmap_color_depth(bitmap);
color_value = getpixel(bitmap, 100, 100);
r = getr_depth(bpp, color_value);
g = getg_depth(bpp, color_value);
b = getb_depth(bpp, color_value);
SEE ALSOgetr(3), getr8(3), geta32(3), makecol(3), set_color_depth(3),
exlights(3)Allegro version 4.4.2 getr_depth(3)