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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkEdgeBuilder_DEFINED
#define SkEdgeBuilder_DEFINED
#include "SkChunkAlloc.h"
#include "SkRect.h"
#include "SkTDArray.h"
struct SkEdge;
class SkEdgeClipper;
class SkPath;
class SkEdgeBuilder {
public:
SkEdgeBuilder();
// returns the number of built edges. The array of those edge pointers
// is returned from edgeList().
int build(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight);
SkEdge** edgeList() { return fEdgeList; }
private:
enum Combine {
kNo_Combine,
kPartial_Combine,
kTotal_Combine
};
static Combine CombineVertical(const SkEdge* edge, SkEdge* last);
Combine checkVertical(const SkEdge* edge, SkEdge** edgePtr);
SkChunkAlloc fAlloc;
SkTDArray<SkEdge*> fList;
/*
* If we're in general mode, we allcoate the pointers in fList, and this
* will point at fList.begin(). If we're in polygon mode, fList will be
* empty, as we will have preallocated room for the pointers in fAlloc's
* block, and fEdgeList will point into that.
*/
SkEdge** fEdgeList;
int fShiftUp;
public:
void addLine(const SkPoint pts[]);
void addQuad(const SkPoint pts[]);
void addCubic(const SkPoint pts[]);
void addClipper(SkEdgeClipper*);
int buildPoly(const SkPath& path, const SkIRect* clip, int shiftUp, bool clipToTheRight);
};
#endif
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