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* Copyright 2012 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkOpSpan_DEFINED
#define SkOpSpan_DEFINED
#include "SkPoint.h"
class SkOpAngle;
class SkOpSegment;
struct SkOpSpan {
SkPoint fPt; // computed when the curves are intersected
double fT;
double fOtherT; // value at fOther[fOtherIndex].fT
SkOpSegment* fOther;
SkOpAngle* fFromAngle; // (if t > 0) index into segment's angle array going negative in t
SkOpAngle* fToAngle; // (if t < 1) index into segment's angle array going positive in t
int fOtherIndex; // can't be used during intersection
int fWindSum; // accumulated from contours surrounding this one.
int fOppSum; // for binary operators: the opposite winding sum
int fWindValue; // 0 == canceled; 1 == normal; >1 == coincident
int fOppValue; // normally 0 -- when binary coincident edges combine, opp value goes here
bool fChased; // set after span has been added to chase array
bool fCoincident; // set if span is bumped -- if set additional points aren't inserted
bool fDone; // if set, this span to next higher T has been processed
bool fLoop; // set when a cubic loops back to this point
bool fMultiple; // set if this is one of mutiple spans with identical t and pt values
bool fNear; // set if opposite end point is near but not equal to this one
bool fSmall; // if set, consecutive points are almost equal
bool fTiny; // if set, consecutive points are equal but consecutive ts are not precisely equal
// available to testing only
const SkOpSegment* debugToSegment(ptrdiff_t* ) const;
void dump() const;
void dumpOne() const;