getr man page

getr, getg, getb, geta — Extract a color component from the current pixel format. Allegro game programming library.

Synopsis

#include <allegro.h>

int getr(int c);

int getg(int c);

int getb(int c);

int geta(int c);

Description

Given a color in the format being used by the current video mode, these functions extract one of the red, green, blue, or alpha components (ranging 0-255), calling the preceding 8, 15, 16, 24, or 32-bit get functions as appropriate. The alpha part is only meaningful for 32-bit pixels. Example:

int r, g, b, color_value;

color_value = getpixel(screen, 100, 100);
r = getr(color_value);
g = getg(color_value);
b = getb(color_value);

See Also

getr8(3), getr_depth(3), makecol(3), set_color_depth(3), exalpha(3)

Referenced By

exalpha(3), getpixel(3), getr8(3), getr_depth(3), set_color_depth(3).

geta(3), getb(3) and getg(3) are aliases of getr(3).

version 4.4.2 Allegro Allegro manual