ethannicholas | e9709e8 | 2016-01-07 13:34:16 -0800 | [diff] [blame] | 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 | |
senorblanco | f57372d | 2016-08-31 10:36:19 -0700 | [diff] [blame^] | 11 | #include "GrColor.h" |
senorblanco | 6599eff | 2016-03-10 08:38:45 -0800 | [diff] [blame] | 12 | #include "SkPoint.h" |
| 13 | |
| 14 | class SkPath; |
| 15 | struct SkRect; |
ethannicholas | e9709e8 | 2016-01-07 13:34:16 -0800 | [diff] [blame] | 16 | |
| 17 | /** |
| 18 | * Provides utility functions for converting paths to a collection of triangles. |
| 19 | */ |
| 20 | |
| 21 | #define TESSELLATOR_WIREFRAME 0 |
| 22 | |
| 23 | namespace GrTessellator { |
| 24 | |
senorblanco | 6599eff | 2016-03-10 08:38:45 -0800 | [diff] [blame] | 25 | class VertexAllocator { |
| 26 | public: |
senorblanco | f57372d | 2016-08-31 10:36:19 -0700 | [diff] [blame^] | 27 | VertexAllocator(size_t stride) : fStride(stride) {} |
senorblanco | 6599eff | 2016-03-10 08:38:45 -0800 | [diff] [blame] | 28 | virtual ~VertexAllocator() {} |
senorblanco | f57372d | 2016-08-31 10:36:19 -0700 | [diff] [blame^] | 29 | virtual void* lock(int vertexCount) = 0; |
senorblanco | 6599eff | 2016-03-10 08:38:45 -0800 | [diff] [blame] | 30 | virtual void unlock(int actualCount) = 0; |
senorblanco | f57372d | 2016-08-31 10:36:19 -0700 | [diff] [blame^] | 31 | size_t stride() const { return fStride; } |
| 32 | private: |
| 33 | size_t fStride; |
senorblanco | 6599eff | 2016-03-10 08:38:45 -0800 | [diff] [blame] | 34 | }; |
| 35 | |
ethannicholas | e9709e8 | 2016-01-07 13:34:16 -0800 | [diff] [blame] | 36 | struct WindingVertex { |
| 37 | SkPoint fPos; |
| 38 | int fWinding; |
| 39 | }; |
| 40 | |
| 41 | // Triangulates a path to an array of vertices. Each triangle is represented as a set of three |
| 42 | // WindingVertex entries, each of which contains the position and winding count (which is the same |
| 43 | // for all three vertices of a triangle). The 'verts' out parameter is set to point to the resultant |
| 44 | // vertex array. CALLER IS RESPONSIBLE for deleting this buffer to avoid a memory leak! |
halcanary | 9d524f2 | 2016-03-29 09:03:52 -0700 | [diff] [blame] | 45 | int PathToVertices(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds, |
ethannicholas | e9709e8 | 2016-01-07 13:34:16 -0800 | [diff] [blame] | 46 | WindingVertex** verts); |
| 47 | |
senorblanco | f57372d | 2016-08-31 10:36:19 -0700 | [diff] [blame^] | 48 | int PathToTriangles(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds, |
| 49 | VertexAllocator*, bool antialias, const GrColor& color, |
| 50 | bool canTweakAlphaForCoverage, bool *isLinear); |
ethannicholas | e9709e8 | 2016-01-07 13:34:16 -0800 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | #endif |