Extract a color component from the specified pixel format.


int getb32(int c);
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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