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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 "SkOpEdgeBuilder.h"
#include "SkReduceOrder.h"
void SkOpEdgeBuilder::init() {
fCurrentContour = NULL;
fOperand = false;
fXorMask[0] = fXorMask[1] = (fPath->getFillType() & 1) ? kEvenOdd_PathOpsMask
: kWinding_PathOpsMask;
#if DEBUG_DUMP
gContourID = 0;
gSegmentID = 0;
#endif
fSecondHalf = preFetch();
}
void SkOpEdgeBuilder::addOperand(const SkPath& path) {
SkASSERT(fPathVerbs.count() > 0 && fPathVerbs.end()[-1] == SkPath::kDone_Verb);
fPathVerbs.pop();
fPath = &path;
fXorMask[1] = (fPath->getFillType() & 1) ? kEvenOdd_PathOpsMask
: kWinding_PathOpsMask;
preFetch();
}
void SkOpEdgeBuilder::finish() {
walk();
complete();
if (fCurrentContour && !fCurrentContour->segments().count()) {
fContours.pop_back();
}
// correct pointers in contours since fReducePts may have moved as it grew
int cIndex = 0;
int extraCount = fExtra.count();
SkASSERT(extraCount == 0 || fExtra[0] == -1);
int eIndex = 0;
int rIndex = 0;
while (++eIndex < extraCount) {
int offset = fExtra[eIndex];
if (offset < 0) {
++cIndex;
continue;
}
fCurrentContour = &fContours[cIndex];
rIndex += fCurrentContour->updateSegment(offset - 1,
&fReducePts[rIndex]);
}
fExtra.reset(); // we're done with this
}
// FIXME:remove once we can access path pts directly
int SkOpEdgeBuilder::preFetch() {
SkPath::RawIter iter(*fPath); // FIXME: access path directly when allowed
SkPoint pts[4];
SkPath::Verb verb;
do {
verb = iter.next(pts);
*fPathVerbs.append() = verb;
if (verb == SkPath::kMove_Verb) {
*fPathPts.append() = pts[0];
} else if (verb >= SkPath::kLine_Verb && verb <= SkPath::kCubic_Verb) {
fPathPts.append(verb, &pts[1]);
}
} while (verb != SkPath::kDone_Verb);
return fPathVerbs.count() - 1;
}
void SkOpEdgeBuilder::walk() {
SkPath::Verb reducedVerb;
uint8_t* verbPtr = fPathVerbs.begin();
uint8_t* endOfFirstHalf = &verbPtr[fSecondHalf];
const SkPoint* pointsPtr = fPathPts.begin();
const SkPoint* finalCurveStart = NULL;
const SkPoint* finalCurveEnd = NULL;
SkPath::Verb verb;
while ((verb = (SkPath::Verb) *verbPtr++) != SkPath::kDone_Verb) {
switch (verb) {
case SkPath::kMove_Verb:
complete();
if (!fCurrentContour) {
fCurrentContour = fContours.push_back_n(1);
fCurrentContour->setOperand(fOperand);
fCurrentContour->setXor(fXorMask[fOperand] == kEvenOdd_PathOpsMask);
*fExtra.append() = -1; // start new contour
}
finalCurveEnd = pointsPtr++;
goto nextVerb;
case SkPath::kLine_Verb:
// skip degenerate points
if (pointsPtr[-1].fX != pointsPtr[0].fX || pointsPtr[-1].fY != pointsPtr[0].fY) {
fCurrentContour->addLine(&pointsPtr[-1]);
}
break;
case SkPath::kQuad_Verb:
reducedVerb = SkReduceOrder::Quad(&pointsPtr[-1], &fReducePts);
if (reducedVerb == 0) {
break; // skip degenerate points
}
if (reducedVerb == 1) {
*fExtra.append() =
fCurrentContour->addLine(fReducePts.end() - 2);
break;
}
fCurrentContour->addQuad(&pointsPtr[-1]);
break;
case SkPath::kCubic_Verb:
reducedVerb = SkReduceOrder::Cubic(&pointsPtr[-1], &fReducePts);
if (reducedVerb == 0) {
break; // skip degenerate points
}
if (reducedVerb == 1) {
*fExtra.append() = fCurrentContour->addLine(fReducePts.end() - 2);
break;
}
if (reducedVerb == 2) {
*fExtra.append() = fCurrentContour->addQuad(fReducePts.end() - 3);
break;
}
fCurrentContour->addCubic(&pointsPtr[-1]);
break;
case SkPath::kClose_Verb:
SkASSERT(fCurrentContour);
if (finalCurveStart && finalCurveEnd
&& *finalCurveStart != *finalCurveEnd) {
*fReducePts.append() = *finalCurveStart;
*fReducePts.append() = *finalCurveEnd;
*fExtra.append() = fCurrentContour->addLine(fReducePts.end() - 2);
}
complete();
goto nextVerb;
default:
SkDEBUGFAIL("bad verb");
return;
}
finalCurveStart = &pointsPtr[verb - 1];
pointsPtr += verb;
SkASSERT(fCurrentContour);
nextVerb:
if (verbPtr == endOfFirstHalf) {
fOperand = true;
}
}
}
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