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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 "SkPathOpsDebug.h"
#include "SkPathOpsTypes.h"
#include "SkPoint.h"
class SkArenaAlloc;
class SkOpAngle;
class SkOpContour;
class SkOpGlobalState;
class SkOpSegment;
class SkOpSpanBase;
class SkOpSpan;
struct SkPathOpsBounds;
// subset of op span used by terminal span (when t is equal to one)
class SkOpPtT {
public:
enum {
kIsAlias = 1,
kIsDuplicate = 1
};
const SkOpPtT* active() const;
// please keep in sync with debugAddOpp()
void addOpp(SkOpPtT* opp, SkOpPtT* oppPrev) {
SkOpPtT* oldNext = this->fNext;
SkASSERT(this != opp);
this->fNext = opp;
SkASSERT(oppPrev != oldNext);
oppPrev->fNext = oldNext;
}
bool alias() const;
bool coincident() const { return fCoincident; }
bool contains(const SkOpPtT* ) const;
bool contains(const SkOpSegment*, const SkPoint& ) const;
bool contains(const SkOpSegment*, double t) const;
const SkOpPtT* contains(const SkOpSegment* ) const;
SkOpContour* contour() const;
int debugID() const {
return SkDEBUGRELEASE(fID, -1);
}
void debugAddOpp(const SkOpPtT* opp, const SkOpPtT* oppPrev) const;
const SkOpAngle* debugAngle(int id) const;
const SkOpCoincidence* debugCoincidence() const;
bool debugContains(const SkOpPtT* ) const;
const SkOpPtT* debugContains(const SkOpSegment* check) const;
SkOpContour* debugContour(int id) const;
const SkOpPtT* debugEnder(const SkOpPtT* end) const;
int debugLoopLimit(bool report) const;
bool debugMatchID(int id) const;
const SkOpPtT* debugOppPrev(const SkOpPtT* opp) const;
const SkOpPtT* debugPtT(int id) const;
void debugResetCoinT() const;
const SkOpSegment* debugSegment(int id) const;
void debugSetCoinT(int ) const;
const SkOpSpanBase* debugSpan(int id) const;
void debugValidate() const;
bool deleted() const {
return fDeleted;
}
bool duplicate() const {
return fDuplicatePt;
}
void dump() const; // available to testing only
void dumpAll() const;
void dumpBase() const;
const SkOpPtT* find(const SkOpSegment* ) const;
SkOpGlobalState* globalState() const;
void init(SkOpSpanBase* , double t, const SkPoint& , bool dup);
void insert(SkOpPtT* span) {
SkASSERT(span != this);
span->fNext = fNext;
fNext = span;
}
const SkOpPtT* next() const {
return fNext;
}
SkOpPtT* next() {
return fNext;
}
bool onEnd() const;
// returns nullptr if this is already in the opp ptT loop
SkOpPtT* oppPrev(const SkOpPtT* opp) const {
// find the fOpp ptr to opp
SkOpPtT* oppPrev = opp->fNext;
if (oppPrev == this) {
return nullptr;
}
while (oppPrev->fNext != opp) {
oppPrev = oppPrev->fNext;
if (oppPrev == this) {
return nullptr;
}
}
return oppPrev;
}
static bool Overlaps(const SkOpPtT* s1, const SkOpPtT* e1, const SkOpPtT* s2,
const SkOpPtT* e2, const SkOpPtT** sOut, const SkOpPtT** eOut) {
const SkOpPtT* start1 = s1->fT < e1->fT ? s1 : e1;
const SkOpPtT* start2 = s2->fT < e2->fT ? s2 : e2;
*sOut = between(s1->fT, start2->fT, e1->fT) ? start2
: between(s2->fT, start1->fT, e2->fT) ? start1 : nullptr;
const SkOpPtT* end1 = s1->fT < e1->fT ? e1 : s1;
const SkOpPtT* end2 = s2->fT < e2->fT ? e2 : s2;
*eOut = between(s1->fT, end2->fT, e1->fT) ? end2
: between(s2->fT, end1->fT, e2->fT) ? end1 : nullptr;
if (*sOut == *eOut) {
SkASSERT(start1->fT >= end2->fT || start2->fT >= end1->fT);
return false;
}
SkASSERT(!*sOut || *sOut != *eOut);
return *sOut && *eOut;
}
bool ptAlreadySeen(const SkOpPtT* head) const;
SkOpPtT* prev();
const SkOpSegment* segment() const;
SkOpSegment* segment();
void setCoincident() const {
SkOPASSERT(!fDeleted);
fCoincident = true;
}
void setDeleted();
void setSpan(const SkOpSpanBase* span) {
fSpan = const_cast<SkOpSpanBase*>(span);
}
const SkOpSpanBase* span() const {
return fSpan;
}
SkOpSpanBase* span() {
return fSpan;
}
const SkOpPtT* starter(const SkOpPtT* end) const {
return fT < end->fT ? this : end;
}
double fT;
SkPoint fPt; // cache of point value at this t
protected:
SkOpSpanBase* fSpan; // contains winding data
SkOpPtT* fNext; // intersection on opposite curve or alias on this curve
bool fDeleted; // set if removed from span list
bool fDuplicatePt; // set if identical pt is somewhere in the next loop
// below mutable since referrer is otherwise always const
mutable bool fCoincident; // set if at some point a coincident span pointed here
SkDEBUGCODE(int fID);
};
class SkOpSpanBase {
public:
SkOpSpanBase* active();
void addOpp(SkOpSpanBase* opp);
void bumpSpanAdds() {
++fSpanAdds;
}
bool chased() const {
return fChased;
}
void checkForCollapsedCoincidence();
const SkOpSpanBase* coinEnd() const {
return fCoinEnd;
}
bool collapsed(double s, double e) const;
bool contains(const SkOpSpanBase* ) const;
const SkOpPtT* contains(const SkOpSegment* ) const;
bool containsCoinEnd(const SkOpSpanBase* coin) const {
SkASSERT(this != coin);
const SkOpSpanBase* next = this;
while ((next = next->fCoinEnd) != this) {
if (next == coin) {
return true;
}
}
return false;
}
bool containsCoinEnd(const SkOpSegment* ) const;
SkOpContour* contour() const;
int debugBumpCount() {
return SkDEBUGRELEASE(++fCount, -1);
}
int debugID() const {
return SkDEBUGRELEASE(fID, -1);
}
#if DEBUG_COIN
void debugAddOpp(SkPathOpsDebug::GlitchLog* , const SkOpSpanBase* opp) const;
#endif
bool debugAlignedEnd(double t, const SkPoint& pt) const;
bool debugAlignedInner() const;
const SkOpAngle* debugAngle(int id) const;
#if DEBUG_COIN
void debugCheckForCollapsedCoincidence(SkPathOpsDebug::GlitchLog* ) const;
#endif
const SkOpCoincidence* debugCoincidence() const;
bool debugCoinEndLoopCheck() const;
SkOpContour* debugContour(int id) const;
#ifdef SK_DEBUG
bool debugDeleted() const { return fDebugDeleted; }
#endif
#if DEBUG_COIN
void debugInsertCoinEnd(SkPathOpsDebug::GlitchLog* ,
const SkOpSpanBase* ) const;
void debugMergeMatches(SkPathOpsDebug::GlitchLog* log,
const SkOpSpanBase* opp) const;
#endif
const SkOpPtT* debugPtT(int id) const;
void debugResetCoinT() const;
const SkOpSegment* debugSegment(int id) const;
void debugSetCoinT(int ) const;
#ifdef SK_DEBUG
void debugSetDeleted() { fDebugDeleted = true; }
#endif
const SkOpSpanBase* debugSpan(int id) const;
const SkOpSpan* debugStarter(SkOpSpanBase const** endPtr) const;
SkOpGlobalState* globalState() const;
void debugValidate() const;
bool deleted() const {
return fPtT.deleted();
}
void dump() const; // available to testing only
void dumpCoin() const;
void dumpAll() const;
void dumpBase() const;
void dumpHead() const;
bool final() const {
return fPtT.fT == 1;
}
SkOpAngle* fromAngle() const {
return fFromAngle;
}
void initBase(SkOpSegment* parent, SkOpSpan* prev, double t, const SkPoint& pt);
// Please keep this in sync with debugInsertCoinEnd()
void insertCoinEnd(SkOpSpanBase* coin) {
if (containsCoinEnd(coin)) {
SkASSERT(coin->containsCoinEnd(this));
return;
}
debugValidate();
SkASSERT(this != coin);
SkOpSpanBase* coinNext = coin->fCoinEnd;
coin->fCoinEnd = this->fCoinEnd;
this->fCoinEnd = coinNext;
debugValidate();
}
void merge(SkOpSpan* span);
void mergeMatches(SkOpSpanBase* opp);
const SkOpSpan* prev() const {
return fPrev;
}
SkOpSpan* prev() {
return fPrev;
}
const SkPoint& pt() const {
return fPtT.fPt;
}
const SkOpPtT* ptT() const {
return &fPtT;
}
SkOpPtT* ptT() {
return &fPtT;
}
SkOpSegment* segment() const {
return fSegment;
}
void setAligned() {
fAligned = true;
}
void setChased(bool chased) {
fChased = chased;
}
void setFromAngle(SkOpAngle* angle) {
fFromAngle = angle;
}
void setPrev(SkOpSpan* prev) {
fPrev = prev;
}
bool simple() const {
fPtT.debugValidate();
return fPtT.next()->next() == &fPtT;
}
int spanAddsCount() const {
return fSpanAdds;
}
const SkOpSpan* starter(const SkOpSpanBase* end) const {
const SkOpSpanBase* result = t() < end->t() ? this : end;
return result->upCast();
}
SkOpSpan* starter(SkOpSpanBase* end) {
SkASSERT(this->segment() == end->segment());
SkOpSpanBase* result = t() < end->t() ? this : end;
return result->upCast();
}
SkOpSpan* starter(SkOpSpanBase** endPtr) {
SkOpSpanBase* end = *endPtr;
SkASSERT(this->segment() == end->segment());
SkOpSpanBase* result;
if (t() < end->t()) {
result = this;
} else {
result = end;
*endPtr = this;
}
return result->upCast();
}
int step(const SkOpSpanBase* end) const {
return t() < end->t() ? 1 : -1;
}
double t() const {
return fPtT.fT;
}
void unaligned() {
fAligned = false;
}
SkOpSpan* upCast() {
SkASSERT(!final());
return (SkOpSpan*) this;
}
const SkOpSpan* upCast() const {
SkOPASSERT(!final());
return (const SkOpSpan*) this;
}
SkOpSpan* upCastable() {
return final() ? nullptr : upCast();
}
const SkOpSpan* upCastable() const {
return final() ? nullptr : upCast();
}
private:
void alignInner();
protected: // no direct access to internals to avoid treating a span base as a span
SkOpPtT fPtT; // list of points and t values associated with the start of this span
SkOpSegment* fSegment; // segment that contains this span
SkOpSpanBase* fCoinEnd; // linked list of coincident spans that end here (may point to itself)
SkOpAngle* fFromAngle; // points to next angle from span start to end
SkOpSpan* fPrev; // previous intersection point
int fSpanAdds; // number of times intersections have been added to span
bool fAligned;
bool fChased; // set after span has been added to chase array
SkDEBUGCODE(int fCount); // number of pt/t pairs added
SkDEBUGCODE(int fID);
SkDEBUGCODE(bool fDebugDeleted); // set when span was merged with another span
};
class SkOpSpan : public SkOpSpanBase {
public:
bool alreadyAdded() const {
if (fAlreadyAdded) {
return true;
}
fAlreadyAdded = true;
return false;
}
bool clearCoincident() {
SkASSERT(!final());
if (fCoincident == this) {
return false;
}
fCoincident = this;
return true;
}
int computeWindSum();
bool containsCoincidence(const SkOpSegment* ) const;
bool containsCoincidence(const SkOpSpan* coin) const {
SkASSERT(this != coin);
const SkOpSpan* next = this;
while ((next = next->fCoincident) != this) {
if (next == coin) {
return true;
}
}
return false;
}
bool debugCoinLoopCheck() const;
#if DEBUG_COIN
void debugInsertCoincidence(SkPathOpsDebug::GlitchLog* , const SkOpSpan* ) const;
void debugInsertCoincidence(SkPathOpsDebug::GlitchLog* ,
const SkOpSegment* , bool flipped, bool ordered) const;
#endif
void dumpCoin() const;
bool dumpSpan() const;
bool done() const {
SkASSERT(!final());
return fDone;
}
void init(SkOpSegment* parent, SkOpSpan* prev, double t, const SkPoint& pt);
bool insertCoincidence(const SkOpSegment* , bool flipped, bool ordered);
// Please keep this in sync with debugInsertCoincidence()
void insertCoincidence(SkOpSpan* coin) {
if (containsCoincidence(coin)) {
SkASSERT(coin->containsCoincidence(this));
return;
}
debugValidate();
SkASSERT(this != coin);
SkOpSpan* coinNext = coin->fCoincident;
coin->fCoincident = this->fCoincident;
this->fCoincident = coinNext;
debugValidate();
}
bool isCanceled() const {
SkASSERT(!final());
return fWindValue == 0 && fOppValue == 0;
}
bool isCoincident() const {
SkASSERT(!final());
return fCoincident != this;
}
SkOpSpanBase* next() const {
SkASSERT(!final());
return fNext;
}
int oppSum() const {
SkASSERT(!final());
return fOppSum;
}
int oppValue() const {
SkASSERT(!final());
return fOppValue;
}
void release(const SkOpPtT* );
SkOpPtT* setCoinStart(SkOpSpan* oldCoinStart, SkOpSegment* oppSegment);
void setDone(bool done) {
SkASSERT(!final());
fDone = done;
}
void setNext(SkOpSpanBase* nextT) {
SkASSERT(!final());
fNext = nextT;
}
void setOppSum(int oppSum);
void setOppValue(int oppValue) {
SkASSERT(!final());
SkASSERT(fOppSum == SK_MinS32);
SkOPASSERT(!oppValue || !fDone);
fOppValue = oppValue;
}
void setToAngle(SkOpAngle* angle) {
SkASSERT(!final());
fToAngle = angle;
}
void setWindSum(int windSum);
void setWindValue(int windValue) {
SkASSERT(!final());
SkASSERT(windValue >= 0);
SkASSERT(fWindSum == SK_MinS32);
SkOPASSERT(!windValue || !fDone);
fWindValue = windValue;
}
bool sortableTop(SkOpContour* );
SkOpAngle* toAngle() const {
SkASSERT(!final());
return fToAngle;
}
int windSum() const {
SkASSERT(!final());
return fWindSum;
}
int windValue() const {
SkOPASSERT(!final());
return fWindValue;
}
private: // no direct access to internals to avoid treating a span base as a span
SkOpSpan* fCoincident; // linked list of spans coincident with this one (may point to itself)
SkOpAngle* fToAngle; // points to next angle from span start to end
SkOpSpanBase* fNext; // next intersection point
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
int fTopTTry; // specifies direction and t value to try next
bool fDone; // if set, this span to next higher T has been processed
mutable bool fAlreadyAdded;
};
#endif