getr_depth(3alleg4) suse man page | unix.com

getr_depth(3alleg4)                                               Allegro manual                                               getr_depth(3alleg4)

NAME
       getr_depth,  getg_depth, getb_depth, geta_depth - Extract a color component from a color in a specified pixel format. Allegro game program-
       ming 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 ALSO
       getr(3alleg4), getr8(3alleg4), geta32(3alleg4), makecol(3alleg4), set_color_depth(3alleg4), exlights(3alleg4)

Allegro                                                            version 4.4.2                                               getr_depth(3alleg4)