geta32(3alleg4) Allegro manual geta32(3alleg4)NAME
geta32 - Extract the alpha component form a 32-bit pixel format color. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int geta32(int c);
DESCRIPTION
Given a color in a 32-bit pixel format, this function extracts the alpha component (ranging 0-255).
SEE ALSO getr8(3alleg4)Allegro version 4.4.2 geta32(3alleg4)
Check Out this Related Man Page
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)
Introduction
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