.\" Generated by the Allegro makedoc utility
.TH getr_depth 3alleg4 "version 4.4.3" "Allegro" "Allegro manual"
.SH 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.\&
.SH SYNOPSIS
.B #include <allegro.h>

.sp
.B int getr_depth(int color_depth, int c);

.B int getg_depth(int color_depth, int c);

.B int getb_depth(int color_depth, int c);

.B int geta_depth(int color_depth, int c);
.SH 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:

.nf
   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);
.fi

.SH SEE ALSO
.BR getr (3alleg4),
.BR getr8 (3alleg4),
.BR geta32 (3alleg4),
.BR makecol (3alleg4),
.BR set_color_depth (3alleg4),
.BR exlights (3alleg4)