note that if not all the points have the same brightness value
the rendering of this polygon will be slower.
relevant only for bitmap fill
100 means the same brightness as the original bitmap
200 means twice as bright as the original bitmap
50 is half bright as the original
see also:
STATE_polygon_get_brightness()
STATE_polygon_set_brightness()
STATE_polygon_is_uniform_brightness()
STATE_point_get_brightness()
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