1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 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