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21 
22 
23 
24 #ifndef _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX
25 #define _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX
26 
27 #include <sal/types.h>
28 
29 //////////////////////////////////////////////////////////////////////////////
30 
31 namespace basegfx
32 {
33     /** Fill rule to use for poly-polygon filling.
34 
35     	The fill rule determines which areas are inside, and which are
36     	outside the poly-polygon.
37      */
38     enum FillRule
39     {
40 		/** Areas, for which a scanline has crossed an odd number of
41             vertices, are regarded 'inside', the remainder 'outside'
42             of the poly-polygon.
43          */
44         FillRule_EVEN_ODD,
45 
46         /** For each edge a scanline crosses, a current winding number
47             is updated. Downward edges count +1, upward edges count
48             -1. If the total accumulated winding number for one area
49             is not zero, this area is regarded 'inside', otherwise,
50             'outside'.
51          */
52         FillRule_NONZERO_WINDING_NUMBER
53     };
54 }
55 
56 #endif /* _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX */
57