getb32
Extract a color component from the specified pixel format.
Description
Given a color in a display dependent format, these functions extract one
of the red, green, or blue components (ranging 0-255). Example:
int r, g, b, color_value;
color_value = _getpixel15(screen, 100, 100);
r = getr15(color_value);
g = getg15(color_value);
b = getb15(color_value);
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