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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 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(3alleg4), getr8(3alleg4), geta32(3alleg4), makecol(3alleg4), set_color_depth(3alleg4), exlights(3alleg4)
version 4.4.2 Allegro