suse man page for getr8

getr8(3alleg4)                                                    Allegro manual                                                    getr8(3alleg4)

NAME
       getr8,  getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 - Extract a color com-
       ponent from the specified pixel format. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       int getr8(int c);

       int getg8(int c);

       int getb8(int c);

       int getr15(int c);

       int getg15(int c);

       int getb15(int c);

       int getr16(int c);

       int getg16(int c);

       int getb16(int c);

       int getr24(int c);

       int getg24(int c);

       int getb24(int c);

       int getr32(int c);

       int getg32(int c);

       int getb32(int c);

DESCRIPTION
       Given a color in a display dependent format, these functions extract one of the red, green, or blue components (ranging 0-255). Example:

          int r, g, b, color_value;

          color_value = _getpixel15(screen, 100, 100);
          r = getr15(color_value);
          g = getg15(color_value);
          b = getb15(color_value);

SEE ALSO
       geta32(3alleg4), getr(3alleg4), getr_depth(3alleg4), makecol(3alleg4), set_color_depth(3alleg4)

Allegro                                                            version 4.4.2                                                    getr8(3alleg4)