NAME
getr_depth, getg_depth, getb_depth, geta_depth - Extract a color
component 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
components (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 ALSO
getr(3alleg), getr8(3alleg), geta32(3alleg), makecol(3alleg),
set_color_depth(3alleg), exlights(3alleg)