/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrTessellator_DEFINED
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#define GrTessellator_DEFINED
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#include "GrColor.h"
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#include "SkColorData.h"
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#include "SkPoint.h"
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class SkPath;
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struct SkRect;
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/**
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* Provides utility functions for converting paths to a collection of triangles.
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*/
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#define TESSELLATOR_WIREFRAME 0
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namespace GrTessellator {
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class VertexAllocator {
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public:
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VertexAllocator(size_t stride) : fStride(stride) {}
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virtual ~VertexAllocator() {}
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virtual void* lock(int vertexCount) = 0;
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virtual void unlock(int actualCount) = 0;
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size_t stride() const { return fStride; }
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private:
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size_t fStride;
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};
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struct WindingVertex {
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SkPoint fPos;
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int fWinding;
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};
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// Triangulates a path to an array of vertices. Each triangle is represented as a set of three
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// WindingVertex entries, each of which contains the position and winding count (which is the same
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// for all three vertices of a triangle). The 'verts' out parameter is set to point to the resultant
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// vertex array. CALLER IS RESPONSIBLE for deleting this buffer to avoid a memory leak!
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int PathToVertices(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds,
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WindingVertex** verts);
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int PathToTriangles(const SkPath& path, SkScalar tolerance, const SkRect& clipBounds,
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VertexAllocator*, bool antialias, bool *isLinear);
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}
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#endif
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