1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 #ifndef SkEdgeBuilder_DEFINED 8 #define SkEdgeBuilder_DEFINED 9 10 #include "SkArenaAlloc.h" 11 #include "SkRect.h" 12 #include "SkTDArray.h" 13 14 struct SkEdge; 15 struct SkAnalyticEdge; 16 class SkEdgeClipper; 17 class SkPath; 18 19 class SkEdgeBuilder { 20 public: 21 SkEdgeBuilder(); 22 23 // returns the number of built edges. The array of those edge pointers 24 // is returned from edgeList(). 25 int build(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight, 26 bool analyticAA = false); 27 28 SkEdge** edgeList() { return (SkEdge**)fEdgeList; } 29 SkAnalyticEdge** analyticEdgeList() { return (SkAnalyticEdge**)fEdgeList; } 30 31 private: 32 enum Combine { 33 kNo_Combine, 34 kPartial_Combine, 35 kTotal_Combine 36 }; 37 38 Combine CombineVertical(const SkEdge* edge, SkEdge* last); 39 Combine CombineVertical(const SkAnalyticEdge* edge, SkAnalyticEdge* last); 40 Combine checkVertical(const SkEdge* edge, SkEdge** edgePtr); 41 Combine checkVertical(const SkAnalyticEdge* edge, SkAnalyticEdge** edgePtr); 42 bool vertical_line(const SkEdge* edge); 43 bool vertical_line(const SkAnalyticEdge* edge); 44 45 SkArenaAlloc fAlloc; 46 SkTDArray<void*> fList; 47 48 /* 49 * If we're in general mode, we allcoate the pointers in fList, and this 50 * will point at fList.begin(). If we're in polygon mode, fList will be 51 * empty, as we will have preallocated room for the pointers in fAlloc's 52 * block, and fEdgeList will point into that. 53 */ 54 void** fEdgeList; 55 56 int fShiftUp; 57 bool fAnalyticAA; 58 59 public: 60 void addLine(const SkPoint pts[]); 61 void addQuad(const SkPoint pts[]); 62 void addCubic(const SkPoint pts[]); 63 void addClipper(SkEdgeClipper*); 64 65 int buildPoly(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight); 66 }; 67 68 #endif 69
