1 /* 2 * Copyright 2015 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 8 #ifndef GrTessellator_DEFINED 9 #define GrTessellator_DEFINED 10 11 #include "GrColor.h" 12 #include "SkColorData.h" 13 #include "SkPoint.h" 14 15 class SkPath; 16 struct SkRect; 17 18 /** 19 * Provides utility functions for converting paths to a collection of triangles. 20 */ 21 22 #define TESSELLATOR_WIREFRAME 0 23 24 namespace GrTessellator { 25 26 class VertexAllocator { 27 public: 28 VertexAllocator(size_t stride) : fStride(stride) {} 29 virtual ~VertexAllocator() {} 30 virtual void* lock(int vertexCount) = 0; 31 virtual void unlock(int actualCount) = 0; 32 size_t stride() const { return fStride; } 33 private: 34 size_t fStride; 35 }; 36 37 struct WindingVertex { 38 SkPoint fPos; 39 int fWinding; 40 }; 41 42 // Triangulates a path to an array of vertices. Each triangle is represented as a set of three 43 // WindingVertex entries, each of which contains the position and winding count (which is the same 44 // for all three vertices of a triangle). The 'verts' out parameter is set to point to the resultant 45 // vertex array. CALLER IS RESPONSIBLE for deleting this buffer to avoid a memory leak! 46 int PathToVertices(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds, 47 WindingVertex** verts); 48 49 int PathToTriangles(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds, 50 VertexAllocator*, bool antialias, bool *isLinear); 51 } 52 53 #endif 54
