getr_depth - Man Page
Extract a color component from a color in a specified pixel format. Allegro game programming 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 components (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(3), getr8(3), geta32(3), makecol(3), set_color_depth(3), exlights(3)
Referenced By
exlights(3), getr(3), getr8(3).
The man pages geta_depth(3), getb_depth(3) and getg_depth(3) are aliases of getr_depth(3).
version 4.4.3 Allegro manual