A zero count means that the point lies outside the fill or clip area.
计数为零意味着该点在填充或剪辑区域的外部。
If the result is nonzero, the point is considered inside the fill or clip area.
如果结果非零，则认为该点在填充或剪辑区域的内部。
If the result is nonzero, the point is considered inside the fill or clip area.
如果结果非零，则认为该点在填充或剪辑区域的内部。
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