return YES or NO
light intensity values are used with bitmap filled polygons
instead of using several bitmaps in different
brightness levels we can simply use this function
we can also specify a different brightness value for each point
of the polygon (using the POINT API functions)
In that case the rendering of the polygon will be slower
if all the points have the same brightness the rendering time
is not damaged.
relevant only for bitmap fill
see also:
STATE_polygon_get_brightness()
STATE_polygon_set_brightness()
STATE_point_get_brightness()
STATE_point_set_brightness()
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