Extract a color component from the current pixel format.
Given a color in the format being used by the current video mode, these
functions extract one of the red, green, blue, or alpha components
(ranging 0-255), calling the preceding 8, 15, 16, 24, or 32-bit get
functions as appropriate. The alpha part is only meaningful for 32-bit
int r, g, b, color_value;
color_value = getpixel(screen, 100, 100);
r = getr(color_value);
g = getg(color_value);
b = getb(color_value);
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