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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.
*/
#include "SkAddIntersections.h"
#include "SkOpCoincidence.h"
#include "SkOpEdgeBuilder.h"
#include "SkPathOpsCommon.h"
#include "SkPathWriter.h"
static SkOpSegment* findChaseOp(SkTDArray<SkOpSpanBase*>& chase, SkOpSpanBase** startPtr,
SkOpSpanBase** endPtr) {
while (chase.count()) {
SkOpSpanBase* span;
chase.pop(&span);
// OPTIMIZE: prev makes this compatible with old code -- but is it necessary?
*startPtr = span->ptT()->prev()->span();
SkOpSegment* segment = (*startPtr)->segment();
bool done = true;
*endPtr = NULL;
if (SkOpAngle* last = segment->activeAngle(*startPtr, startPtr, endPtr, &done)) {
*startPtr = last->start();
*endPtr = last->end();
#if TRY_ROTATE
*chase.insert(0) = span;
#else
*chase.append() = span;
#endif
return last->segment();
}
if (done) {
continue;
}
int winding;
bool sortable;
const SkOpAngle* angle = AngleWinding(*startPtr, *endPtr, &winding, &sortable);
if (winding == SK_MinS32) {
continue;
}
int sumMiWinding, sumSuWinding;
if (sortable) {
segment = angle->segment();
sumMiWinding = segment->updateWindingReverse(angle);
sumSuWinding = segment->updateOppWindingReverse(angle);
if (segment->operand()) {
SkTSwap<int>(sumMiWinding, sumSuWinding);
}
}
SkOpSegment* first = NULL;
const SkOpAngle* firstAngle = angle;
while ((angle = angle->next()) != firstAngle) {
segment = angle->segment();
SkOpSpanBase* start = angle->start();
SkOpSpanBase* end = angle->end();
int maxWinding, sumWinding, oppMaxWinding, oppSumWinding;
if (sortable) {
segment->setUpWindings(start, end, &sumMiWinding, &sumSuWinding,
&maxWinding, &sumWinding, &oppMaxWinding, &oppSumWinding);
}
if (!segment->done(angle)) {
if (!first && (sortable || start->starter(end)->windSum() != SK_MinS32)) {
first = segment;
*startPtr = start;
*endPtr = end;
}
// OPTIMIZATION: should this also add to the chase?
if (sortable) {
(void) segment->markAngle(maxWinding, sumWinding, oppMaxWinding,
oppSumWinding, angle);
}
}
}
if (first) {
#if TRY_ROTATE
*chase.insert(0) = span;
#else
*chase.append() = span;
#endif
return first;
}
}
return NULL;
}
static bool bridgeOp(SkOpContourHead* contourList, const SkPathOp op,
const int xorMask, const int xorOpMask, SkPathWriter* simple, SkChunkAlloc* allocator) {
bool unsortable = false;
do {
SkOpSpan* span = FindSortableTop(contourList);
if (!span) {
break;
}
SkOpSegment* current = span->segment();
SkOpSpanBase* start = span->next();
SkOpSpanBase* end = span;
SkTDArray<SkOpSpanBase*> chase;
do {
if (current->activeOp(start, end, xorMask, xorOpMask, op)) {
do {
if (!unsortable && current->done()) {
break;
}
SkASSERT(unsortable || !current->done());
SkOpSpanBase* nextStart = start;
SkOpSpanBase* nextEnd = end;
SkOpSegment* next = current->findNextOp(&chase, &nextStart, &nextEnd,
&unsortable, op, xorMask, xorOpMask);
if (!next) {
if (!unsortable && simple->hasMove()
&& current->verb() != SkPath::kLine_Verb
&& !simple->isClosed()) {
current->addCurveTo(start, end, simple, true);
#if DEBUG_ACTIVE_SPANS
if (!simple->isClosed()) {
DebugShowActiveSpans(contourList);
}
#endif
}
break;
}
#if DEBUG_FLOW
SkDebugf("%s current id=%d from=(%1.9g,%1.9g) to=(%1.9g,%1.9g)\n", __FUNCTION__,
current->debugID(), start->pt().fX, start->pt().fY,
end->pt().fX, end->pt().fY);
#endif
current->addCurveTo(start, end, simple, true);
current = next;
start = nextStart;
end = nextEnd;
} while (!simple->isClosed() && (!unsortable || !start->starter(end)->done()));
if (current->activeWinding(start, end) && !simple->isClosed()) {
SkOpSpan* spanStart = start->starter(end);
if (!spanStart->done()) {
current->addCurveTo(start, end, simple, true);
current->markDone(spanStart);
}
}
simple->close();
} else {
SkOpSpanBase* last = current->markAndChaseDone(start, end);
if (last && !last->chased()) {
last->setChased(true);
SkASSERT(!SkPathOpsDebug::ChaseContains(chase, last));
*chase.append() = last;
#if DEBUG_WINDING
SkDebugf("%s chase.append id=%d", __FUNCTION__, last->segment()->debugID());
if (!last->final()) {
SkDebugf(" windSum=%d", last->upCast()->windSum());
}
SkDebugf("\n");
#endif
}
}
current = findChaseOp(chase, &start, &end);
#if DEBUG_ACTIVE_SPANS
DebugShowActiveSpans(contourList);
#endif
if (!current) {
break;
}
} while (true);
} while (true);
return simple->someAssemblyRequired();
}
// pretty picture:
// https://docs.google.com/a/google.com/drawings/d/1sPV8rPfpEFXymBp3iSbDRWAycp1b-7vD9JP2V-kn9Ss/edit?usp=sharing
static const SkPathOp gOpInverse[kReverseDifference_SkPathOp + 1][2][2] = {
// inside minuend outside minuend
// inside subtrahend outside subtrahend inside subtrahend outside subtrahend
{{ kDifference_SkPathOp, kIntersect_SkPathOp }, { kUnion_SkPathOp, kReverseDifference_SkPathOp }},
{{ kIntersect_SkPathOp, kDifference_SkPathOp }, { kReverseDifference_SkPathOp, kUnion_SkPathOp }},
{{ kUnion_SkPathOp, kReverseDifference_SkPathOp }, { kDifference_SkPathOp, kIntersect_SkPathOp }},
{{ kXOR_SkPathOp, kXOR_SkPathOp }, { kXOR_SkPathOp, kXOR_SkPathOp }},
{{ kReverseDifference_SkPathOp, kUnion_SkPathOp }, { kIntersect_SkPathOp, kDifference_SkPathOp }},
};
static const bool gOutInverse[kReverseDifference_SkPathOp + 1][2][2] = {
{{ false, false }, { true, false }}, // diff
{{ false, false }, { false, true }}, // sect
{{ false, true }, { true, true }}, // union
{{ false, true }, { true, false }}, // xor
{{ false, true }, { false, false }}, // rev diff
};
#define DEBUGGING_PATHOPS_FROM_HOST 0 // enable to debug svg in chrome -- note path hardcoded below
#if DEBUGGING_PATHOPS_FROM_HOST
#include "SkData.h"
#include "SkStream.h"
static void dump_path(FILE* file, const SkPath& path, bool force, bool dumpAsHex) {
SkDynamicMemoryWStream wStream;
path.dump(&wStream, force, dumpAsHex);
SkAutoDataUnref data(wStream.copyToData());
fprintf(file, "%.*s\n", (int) data->size(), data->data());
}
static int dumpID = 0;
static void dump_op(const SkPath& one, const SkPath& two, SkPathOp op) {
#if SK_BUILD_FOR_MAC
FILE* file = fopen("/Users/caryclark/Documents/svgop.txt", "w");
#else
FILE* file = fopen("/usr/local/google/home/caryclark/Documents/svgop.txt", "w");
#endif
fprintf(file,
"\nstatic void fuzz763_%d(skiatest::Reporter* reporter, const char* filename) {\n",
++dumpID);
fprintf(file, " SkPath path;\n");
fprintf(file, " path.setFillType((SkPath::FillType) %d);\n", one.getFillType());
dump_path(file, one, false, true);
fprintf(file, " SkPath path1(path);\n");
fprintf(file, " path.reset();\n");
fprintf(file, " path.setFillType((SkPath::FillType) %d);\n", two.getFillType());
dump_path(file, two, false, true);
fprintf(file, " SkPath path2(path);\n");
fprintf(file, " testPathOp(reporter, path1, path2, (SkPathOp) %d, filename);\n", op);
fprintf(file, "}\n");
fclose(file);
}
#endif
bool OpDebug(const SkPath& one, const SkPath& two, SkPathOp op, SkPath* result,
bool expectSuccess SkDEBUGPARAMS(const char* testName)) {
SkChunkAlloc allocator(4096); // FIXME: add a constant expression here, tune
SkOpContour contour;
SkOpContourHead* contourList = static_cast<SkOpContourHead*>(&contour);
SkOpCoincidence coincidence;
SkOpGlobalState globalState(&coincidence, contourList SkDEBUGPARAMS(testName));
#if DEBUGGING_PATHOPS_FROM_HOST
dump_op(one, two, op);
#endif
#if 0 && DEBUG_SHOW_TEST_NAME
char* debugName = DEBUG_FILENAME_STRING;
if (debugName && debugName[0]) {
SkPathOpsDebug::BumpTestName(debugName);
SkPathOpsDebug::ShowPath(one, two, op, debugName);
}
#endif
op = gOpInverse[op][one.isInverseFillType()][two.isInverseFillType()];
SkPath::FillType fillType = gOutInverse[op][one.isInverseFillType()][two.isInverseFillType()]
? SkPath::kInverseEvenOdd_FillType : SkPath::kEvenOdd_FillType;
const SkPath* minuend = &one;
const SkPath* subtrahend = &two;
if (op == kReverseDifference_SkPathOp) {
minuend = &two;
subtrahend = &one;
op = kDifference_SkPathOp;
}
#if DEBUG_SORT
SkPathOpsDebug::gSortCount = SkPathOpsDebug::gSortCountDefault;
#endif
// turn path into list of segments
SkOpEdgeBuilder builder(*minuend, &contour, &allocator, &globalState);
if (builder.unparseable()) {
return false;
}
const int xorMask = builder.xorMask();
builder.addOperand(*subtrahend);
if (!builder.finish(&allocator)) {
return false;
}
#if DEBUG_DUMP_SEGMENTS
contour.dumpSegments(op);
#endif
const int xorOpMask = builder.xorMask();
if (!SortContourList(&contourList, xorMask == kEvenOdd_PathOpsMask,
xorOpMask == kEvenOdd_PathOpsMask)) {
result->reset();
result->setFillType(fillType);
return true;
}
// find all intersections between segments
SkOpContour* current = contourList;
do {
SkOpContour* next = current;
while (AddIntersectTs(current, next, &coincidence, &allocator)
&& (next = next->next()))
;
} while ((current = current->next()));
#if DEBUG_VALIDATE
globalState.setPhase(SkOpGlobalState::kWalking);
#endif
if (!HandleCoincidence(contourList, &coincidence, &allocator)) {
return false;
}
// construct closed contours
result->reset();
result->setFillType(fillType);
SkPathWriter wrapper(*result);
bridgeOp(contourList, op, xorMask, xorOpMask, &wrapper, &allocator);
{ // if some edges could not be resolved, assemble remaining fragments
SkPath temp;
temp.setFillType(fillType);
SkPathWriter assembled(temp);
Assemble(wrapper, &assembled);
*result = *assembled.nativePath();
result->setFillType(fillType);
}
return true;
}
bool Op(const SkPath& one, const SkPath& two, SkPathOp op, SkPath* result) {
return OpDebug(one, two, op, result, true SkDEBUGPARAMS(NULL));
}