getr_depth man page on DragonFly

getr_depth man page on DragonFly

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getr_depth(3)			Allegro manual			 getr_depth(3)

NAME
       getr_depth, getg_depth, getb_depth, geta_depth - Extract a color compo‐
       nent 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	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(3),	  getr8(3),   geta32(3),    makecol(3),	   set_color_depth(3),
       exlights(3)

Allegro				 version 4.4.2			 getr_depth(3)

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