Line data    Source code

       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 "SkPoint.h"
      13             : 
      14             : class SkPath;
      15             : struct SkRect;
      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             : 
      25             : class VertexAllocator {
      26             : public:
      27           0 :     VertexAllocator(size_t stride) : fStride(stride) {}
      28           0 :     virtual ~VertexAllocator() {}
      29             :     virtual void* lock(int vertexCount) = 0;
      30             :     virtual void unlock(int actualCount) = 0;
      31           0 :     size_t stride() const { return fStride; }
      32             : private:
      33             :     size_t fStride;
      34             : };
      35             : 
      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!
      45             : int PathToVertices(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds,
      46             :                    WindingVertex** verts);
      47             : 
      48             : int PathToTriangles(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds, 
      49             :                     VertexAllocator*, bool antialias, const GrColor& color,
      50             :                     bool canTweakAlphaForCoverage, bool *isLinear);
      51             : }
      52             : 
      53             : #endif