getr.3alleg

Langue: en

Version: version 4.2.2 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

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