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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkOpContour_DEFINED
#define SkOpContour_DEFINED
#include "SkOpSegment.h"
#include "SkTDArray.h"
#include "SkTSort.h"
enum class SkOpRayDir;
struct SkOpRayHit;
class SkPathWriter;
class SkOpContour {
public:
SkOpContour() {
reset();
}
bool operator<(const SkOpContour& rh) const {
return fBounds.fTop == rh.fBounds.fTop
? fBounds.fLeft < rh.fBounds.fLeft
: fBounds.fTop < rh.fBounds.fTop;
}
void addConic(SkPoint pts[3], SkScalar weight) {
appendSegment().addConic(pts, weight, this);
}
void addCubic(SkPoint pts[4]) {
appendSegment().addCubic(pts, this);
}
SkOpSegment* addLine(SkPoint pts[2]) {
SkASSERT(pts[0] != pts[1]);
return appendSegment().addLine(pts, this);
}
void addQuad(SkPoint pts[3]) {
appendSegment().addQuad(pts, this);
}
SkOpSegment& appendSegment() {
SkOpSegment* result = fCount++ ? this->globalState()->allocator()->make<SkOpSegment>()
: &fHead;
result->setPrev(fTail);
if (fTail) {
fTail->setNext(result);
}
fTail = result;
return *result;
}
const SkPathOpsBounds& bounds() const {
return fBounds;
}
void calcAngles() {
SkASSERT(fCount > 0);
SkOpSegment* segment = &fHead;
do {
segment->calcAngles();
} while ((segment = segment->next()));
}
void complete() {
setBounds();
}
int count() const {
return fCount;
}
int debugID() const {
return SkDEBUGRELEASE(fID, -1);
}
int debugIndent() const {
return SkDEBUGRELEASE(fDebugIndent, 0);
}
const SkOpAngle* debugAngle(int id) const {
return SkDEBUGRELEASE(this->globalState()->debugAngle(id), nullptr);
}
const SkOpCoincidence* debugCoincidence() const {
return this->globalState()->coincidence();
}
#if DEBUG_COIN
void debugCheckHealth(SkPathOpsDebug::GlitchLog* ) const;
#endif
SkOpContour* debugContour(int id) const {
return SkDEBUGRELEASE(this->globalState()->debugContour(id), nullptr);
}
#if DEBUG_COIN
void debugMissingCoincidence(SkPathOpsDebug::GlitchLog* log) const;
void debugMoveMultiples(SkPathOpsDebug::GlitchLog* ) const;
void debugMoveNearby(SkPathOpsDebug::GlitchLog* log) const;
#endif
const SkOpPtT* debugPtT(int id) const {
return SkDEBUGRELEASE(this->globalState()->debugPtT(id), nullptr);
}
const SkOpSegment* debugSegment(int id) const {
return SkDEBUGRELEASE(this->globalState()->debugSegment(id), nullptr);
}
#if DEBUG_ACTIVE_SPANS
void debugShowActiveSpans(SkString* str) {
SkOpSegment* segment = &fHead;
do {
segment->debugShowActiveSpans(str);
} while ((segment = segment->next()));
}
#endif
const SkOpSpanBase* debugSpan(int id) const {
return SkDEBUGRELEASE(this->globalState()->debugSpan(id), nullptr);
}
SkOpGlobalState* globalState() const {
return fState;
}
void debugValidate() const {
#if DEBUG_VALIDATE
const SkOpSegment* segment = &fHead;
const SkOpSegment* prior = nullptr;
do {
segment->debugValidate();
SkASSERT(segment->prev() == prior);
prior = segment;
} while ((segment = segment->next()));
SkASSERT(prior == fTail);
#endif
}
bool done() const {
return fDone;
}
void dump() const;
void dumpAll() const;
void dumpAngles() const;
void dumpContours() const;
void dumpContoursAll() const;
void dumpContoursAngles() const;
void dumpContoursPts() const;
void dumpContoursPt(int segmentID) const;
void dumpContoursSegment(int segmentID) const;
void dumpContoursSpan(int segmentID) const;
void dumpContoursSpans() const;
void dumpPt(int ) const;
void dumpPts(const char* prefix = "seg") const;
void dumpPtsX(const char* prefix) const;
void dumpSegment(int ) const;
void dumpSegments(const char* prefix = "seg", SkPathOp op = (SkPathOp) -1) const;
void dumpSpan(int ) const;
void dumpSpans() const;
const SkPoint& end() const {
return fTail->pts()[SkPathOpsVerbToPoints(fTail->verb())];
}
SkOpSpan* findSortableTop(SkOpContour* );
SkOpSegment* first() {
SkASSERT(fCount > 0);
return &fHead;
}
const SkOpSegment* first() const {
SkASSERT(fCount > 0);
return &fHead;
}
void indentDump() const {
SkDEBUGCODE(fDebugIndent += 2);
}
void init(SkOpGlobalState* globalState, bool operand, bool isXor) {
fState = globalState;
fOperand = operand;
fXor = isXor;
SkDEBUGCODE(fID = globalState->nextContourID());
}
int isCcw() const {
return fCcw;
}
bool isXor() const {
return fXor;
}
void joinSegments() {
SkOpSegment* segment = &fHead;
SkOpSegment* next;
do {
next = segment->next();
segment->joinEnds(next ? next : &fHead);
} while ((segment = next));
}
void markAllDone() {
SkOpSegment* segment = &fHead;
do {
segment->markAllDone();
} while ((segment = segment->next()));
}
// Please keep this aligned with debugMissingCoincidence()
bool missingCoincidence() {
SkASSERT(fCount > 0);
SkOpSegment* segment = &fHead;
bool result = false;
do {
if (segment->missingCoincidence()) {
result = true;
}
segment = segment->next();
} while (segment);
return result;
}
bool moveMultiples() {
SkASSERT(fCount > 0);
SkOpSegment* segment = &fHead;
do {
if (!segment->moveMultiples()) {
return false;
}
} while ((segment = segment->next()));
return true;
}
bool moveNearby() {
SkASSERT(fCount > 0);
SkOpSegment* segment = &fHead;
do {
if (!segment->moveNearby()) {
return false;
}
} while ((segment = segment->next()));
return true;
}
SkOpContour* next() {
return fNext;
}
const SkOpContour* next() const {
return fNext;
}
bool operand() const {
return fOperand;
}
bool oppXor() const {
return fOppXor;
}
void outdentDump() const {
SkDEBUGCODE(fDebugIndent -= 2);
}
void rayCheck(const SkOpRayHit& base, SkOpRayDir dir, SkOpRayHit** hits, SkArenaAlloc*);
void reset() {
fTail = nullptr;
fNext = nullptr;
fCount = 0;
fDone = false;
SkDEBUGCODE(fBounds.set(SK_ScalarMax, SK_ScalarMax, SK_ScalarMin, SK_ScalarMin));
SkDEBUGCODE(fFirstSorted = -1);
SkDEBUGCODE(fDebugIndent = 0);
}
void resetReverse() {
SkOpContour* next = this;
do {
if (!next->count()) {
continue;
}
next->fCcw = -1;
next->fReverse = false;
} while ((next = next->next()));
}
bool reversed() const {
return fReverse;
}
void setBounds() {
SkASSERT(fCount > 0);
const SkOpSegment* segment = &fHead;
fBounds = segment->bounds();
while ((segment = segment->next())) {
fBounds.add(segment->bounds());
}
}
void setCcw(int ccw) {
fCcw = ccw;
}
void setGlobalState(SkOpGlobalState* state) {
fState = state;
}
void setNext(SkOpContour* contour) {
// SkASSERT(!fNext == !!contour);
fNext = contour;
}
void setOperand(bool isOp) {
fOperand = isOp;
}
void setOppXor(bool isOppXor) {
fOppXor = isOppXor;
}
void setReverse() {
fReverse = true;
}
void setXor(bool isXor) {
fXor = isXor;
}
bool sortAngles() {
SkASSERT(fCount > 0);
SkOpSegment* segment = &fHead;
do {
FAIL_IF(!segment->sortAngles());
} while ((segment = segment->next()));
return true;
}
const SkPoint& start() const {
return fHead.pts()[0];
}
void toPartialBackward(SkPathWriter* path) const {
const SkOpSegment* segment = fTail;
do {
SkAssertResult(segment->addCurveTo(segment->tail(), segment->head(), path));
} while ((segment = segment->prev()));
}
void toPartialForward(SkPathWriter* path) const {
const SkOpSegment* segment = &fHead;
do {
SkAssertResult(segment->addCurveTo(segment->head(), segment->tail(), path));
} while ((segment = segment->next()));
}
void toReversePath(SkPathWriter* path) const;
void toPath(SkPathWriter* path) const;
SkOpSpan* undoneSpan();
protected:
SkOpGlobalState* fState;
SkOpSegment fHead;
SkOpSegment* fTail;
SkOpContour* fNext;
SkPathOpsBounds fBounds;
int fCcw;
int fCount;
int fFirstSorted;
bool fDone; // set by find top segment
bool fOperand; // true for the second argument to a binary operator
bool fReverse; // true if contour should be reverse written to path (used only by fix winding)
bool fXor; // set if original path had even-odd fill
bool fOppXor; // set if opposite path had even-odd fill
SkDEBUGCODE(int fID);
SkDEBUGCODE(mutable int fDebugIndent);
};
class SkOpContourHead : public SkOpContour {
public:
SkOpContour* appendContour() {
SkOpContour* contour = this->globalState()->allocator()->make<SkOpContour>();
contour->setNext(nullptr);
SkOpContour* prev = this;
SkOpContour* next;
while ((next = prev->next())) {
prev = next;
}
prev->setNext(contour);
return contour;
}
void joinAllSegments() {
SkOpContour* next = this;
do {
if (!next->count()) {
continue;
}
next->joinSegments();
} while ((next = next->next()));
}
void remove(SkOpContour* contour) {
if (contour == this) {
SkASSERT(this->count() == 0);
return;
}
SkASSERT(contour->next() == nullptr);
SkOpContour* prev = this;
SkOpContour* next;
while ((next = prev->next()) != contour) {
SkASSERT(next);
prev = next;
}
SkASSERT(prev);
prev->setNext(nullptr);
}
};
class SkOpContourBuilder {
public:
SkOpContourBuilder(SkOpContour* contour)
: fContour(contour)
, fLastIsLine(false) {
}
void addConic(SkPoint pts[3], SkScalar weight);
void addCubic(SkPoint pts[4]);
void addCurve(SkPath::Verb verb, const SkPoint pts[4], SkScalar weight = 1);
void addLine(const SkPoint pts[2]);
void addQuad(SkPoint pts[3]);
void flush();
SkOpContour* contour() { return fContour; }
void setContour(SkOpContour* contour) { flush(); fContour = contour; }
protected:
SkOpContour* fContour;
SkPoint fLastLine[2];
bool fLastIsLine;
};
#endif