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