bool TightBounds(const SkPath& path, SkRect* result) {
SkChunkAlloc allocator(4096); // FIXME: constant-ize, tune
SkOpContour contour;
SkOpContourHead* contourList = static_cast<SkOpContourHead*>(&contour);
SkOpGlobalState globalState(contourList, &allocator SkDEBUGPARAMS(false)
SkDEBUGPARAMS(nullptr));
// turn path into list of segments
SkScalar scaleFactor = ScaleFactor(path);
SkPath scaledPath;
const SkPath* workingPath;
if (scaleFactor > SK_Scalar1) {
ScalePath(path, 1.f / scaleFactor, &scaledPath);
workingPath = &scaledPath;
} else {
workingPath = &path;
}
SkOpEdgeBuilder builder(*workingPath, &contour, &globalState);
if (!builder.finish()) {
return false;
}
if (!SortContourList(&contourList, false, false)) {
result->setEmpty();
return true;
}
SkOpContour* current = contourList;
SkPathOpsBounds bounds = current->bounds();
while ((current = current->next())) {
bounds.add(current->bounds());
}
*result = bounds;
return true;
}
bool TightBounds(const SkPath& path, SkRect* result) {
SkChunkAlloc allocator(4096); // FIXME: constant-ize, tune
SkOpContour contour;
SkOpContourHead* contourList = static_cast<SkOpContourHead*>(&contour);
SkOpGlobalState globalState(nullptr, contourList SkDEBUGPARAMS(nullptr));
// turn path into list of segments
SkOpEdgeBuilder builder(path, &contour, &allocator, &globalState);
if (!builder.finish(&allocator)) {
return false;
}
if (!SortContourList(&contourList, false, false)) {
result->setEmpty();
return true;
}
SkOpContour* current = contourList;
SkPathOpsBounds bounds = current->bounds();
while ((current = current->next())) {
bounds.add(current->bounds());
}
*result = bounds;
return true;
}
static SkOpSegment* findTopSegment(const SkTArray<SkOpContour*, true>& contourList, int* index,
int* endIndex, SkPoint* topLeft, bool* unsortable, bool* done, bool firstPass) {
SkOpSegment* result;
const SkOpSegment* lastTopStart = NULL;
int lastIndex = -1, lastEndIndex = -1;
do {
SkPoint bestXY = {SK_ScalarMax, SK_ScalarMax};
int contourCount = contourList.count();
SkOpSegment* topStart = NULL;
*done = true;
for (int cIndex = 0; cIndex < contourCount; ++cIndex) {
SkOpContour* contour = contourList[cIndex];
if (contour->done()) {
continue;
}
const SkPathOpsBounds& bounds = contour->bounds();
if (bounds.fBottom < topLeft->fY) {
*done = false;
continue;
}
if (bounds.fBottom == topLeft->fY && bounds.fRight < topLeft->fX) {
*done = false;
continue;
}
contour->topSortableSegment(*topLeft, &bestXY, &topStart);
if (!contour->done()) {
*done = false;
}
}
if (!topStart) {
return NULL;
}
*topLeft = bestXY;
result = topStart->findTop(index, endIndex, unsortable, firstPass);
if (!result) {
if (lastTopStart == topStart && lastIndex == *index && lastEndIndex == *endIndex) {
*done = true;
return NULL;
}
lastTopStart = topStart;
lastIndex = *index;
lastEndIndex = *endIndex;
}
} while (!result);
return result;
}
static int contourRangeCheckY(const SkTArray<SkOpContour*, true>& contourList, SkOpSegment** currentPtr,
int* indexPtr, int* endIndexPtr, double* bestHit, SkScalar* bestDx,
bool* tryAgain, double* midPtr, bool opp) {
const int index = *indexPtr;
const int endIndex = *endIndexPtr;
const double mid = *midPtr;
const SkOpSegment* current = *currentPtr;
double tAtMid = current->tAtMid(index, endIndex, mid);
SkPoint basePt = current->ptAtT(tAtMid);
int contourCount = contourList.count();
SkScalar bestY = SK_ScalarMin;
SkOpSegment* bestSeg = NULL;
int bestTIndex = 0;
bool bestOpp;
bool hitSomething = false;
for (int cTest = 0; cTest < contourCount; ++cTest) {
SkOpContour* contour = contourList[cTest];
bool testOpp = contour->operand() ^ current->operand() ^ opp;
if (basePt.fY < contour->bounds().fTop) {
continue;
}
if (bestY > contour->bounds().fBottom) {
continue;
}
int segmentCount = contour->segments().count();
for (int test = 0; test < segmentCount; ++test) {
SkOpSegment* testSeg = &contour->segments()[test];
SkScalar testY = bestY;
double testHit;
int testTIndex = testSeg->crossedSpanY(basePt, &testY, &testHit, &hitSomething, tAtMid,
testOpp, testSeg == current);
if (testTIndex < 0) {
if (testTIndex == SK_MinS32) {
hitSomething = true;
bestSeg = NULL;
goto abortContours; // vertical encountered, return and try different point
}
continue;
}
if (testSeg == current && current->betweenTs(index, testHit, endIndex)) {
double baseT = current->t(index);
double endT = current->t(endIndex);
double newMid = (testHit - baseT) / (endT - baseT);
#if DEBUG_WINDING
double midT = current->tAtMid(index, endIndex, mid);
SkPoint midXY = current->xyAtT(midT);
double newMidT = current->tAtMid(index, endIndex, newMid);
SkPoint newXY = current->xyAtT(newMidT);
SkDebugf("%s [%d] mid=%1.9g->%1.9g s=%1.9g (%1.9g,%1.9g) m=%1.9g (%1.9g,%1.9g)"
" n=%1.9g (%1.9g,%1.9g) e=%1.9g (%1.9g,%1.9g)\n", __FUNCTION__,
current->debugID(), mid, newMid,
baseT, current->xAtT(index), current->yAtT(index),
baseT + mid * (endT - baseT), midXY.fX, midXY.fY,
baseT + newMid * (endT - baseT), newXY.fX, newXY.fY,
endT, current->xAtT(endIndex), current->yAtT(endIndex));
#endif
*midPtr = newMid * 2; // calling loop with divide by 2 before continuing
return SK_MinS32;
}
bestSeg = testSeg;
*bestHit = testHit;
bestOpp = testOpp;
bestTIndex = testTIndex;
bestY = testY;
}
}
abortContours:
int result;
if (!bestSeg) {
result = hitSomething ? SK_MinS32 : 0;
} else {
if (bestSeg->windSum(bestTIndex) == SK_MinS32) {
*currentPtr = bestSeg;
*indexPtr = bestTIndex;
*endIndexPtr = bestSeg->nextSpan(bestTIndex, 1);
SkASSERT(*indexPtr != *endIndexPtr && *indexPtr >= 0 && *endIndexPtr >= 0);
*tryAgain = true;
return 0;
}
result = bestSeg->windingAtT(*bestHit, bestTIndex, bestOpp, bestDx);
SkASSERT(result == SK_MinS32 || *bestDx);
}
double baseT = current->t(index);
double endT = current->t(endIndex);
*bestHit = baseT + mid * (endT - baseT);
return result;
}
