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geta32(3alleg4) [opendarwin man page]

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)
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