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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 "SkPathOpsBounds.h"
#if DEBUG_ADD_INTERSECTING_TS
static void debugShowLineIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn, const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " LINE_DEBUG_STR " " LINE_DEBUG_STR "\n",
__FUNCTION__, LINE_DEBUG_DATA(wt.pts()), LINE_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " LINE_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], LINE_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
if (pts == 2) {
SkDebugf(" " T_DEBUG_STR(wtTs, 1) " " PT_DEBUG_STR, i[0][1], PT_DEBUG_DATA(i, 1));
}
SkDebugf(" wnTs[0]=%g " LINE_DEBUG_STR, i[1][0], LINE_DEBUG_DATA(wn.pts()));
if (pts == 2) {
SkDebugf(" " T_DEBUG_STR(wnTs, 1), i[1][1]);
}
SkDebugf("\n");
}
static void debugShowQuadLineIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn,
const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " QUAD_DEBUG_STR " " LINE_DEBUG_STR "\n",
__FUNCTION__, QUAD_DEBUG_DATA(wt.pts()), LINE_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " QUAD_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], QUAD_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wtTs) " " PT_DEBUG_STR, n, i[0][n], PT_DEBUG_DATA(i, n));
}
SkDebugf(" wnTs[0]=%g " LINE_DEBUG_STR, i[1][0], LINE_DEBUG_DATA(wn.pts()));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wnTs), n, i[1][n]);
}
SkDebugf("\n");
}
static void debugShowQuadIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn, const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " QUAD_DEBUG_STR " " QUAD_DEBUG_STR "\n",
__FUNCTION__, QUAD_DEBUG_DATA(wt.pts()), QUAD_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " QUAD_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], QUAD_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wtTs) " " PT_DEBUG_STR, n, i[0][n], PT_DEBUG_DATA(i, n));
}
SkDebugf(" wnTs[0]=%g " QUAD_DEBUG_STR, i[1][0], QUAD_DEBUG_DATA(wn.pts()));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wnTs), n, i[1][n]);
}
SkDebugf("\n");
}
static void debugShowCubicLineIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn, const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " CUBIC_DEBUG_STR " " LINE_DEBUG_STR "\n",
__FUNCTION__, CUBIC_DEBUG_DATA(wt.pts()), LINE_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " CUBIC_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], CUBIC_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wtTs) " " PT_DEBUG_STR, n, i[0][n], PT_DEBUG_DATA(i, n));
}
SkDebugf(" wnTs[0]=%g " LINE_DEBUG_STR, i[1][0], LINE_DEBUG_DATA(wn.pts()));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wnTs), n, i[1][n]);
}
SkDebugf("\n");
}
static void debugShowCubicQuadIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn, const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " CUBIC_DEBUG_STR " " QUAD_DEBUG_STR "\n",
__FUNCTION__, CUBIC_DEBUG_DATA(wt.pts()), QUAD_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " CUBIC_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], CUBIC_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wtTs) " " PT_DEBUG_STR, n, i[0][n], PT_DEBUG_DATA(i, n));
}
SkDebugf(" wnTs[0]=%g " QUAD_DEBUG_STR, i[1][0], QUAD_DEBUG_DATA(wn.pts()));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wnTs), n, i[1][n]);
}
SkDebugf("\n");
}
static void debugShowCubicIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersectionHelper& wn, const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no intersect " CUBIC_DEBUG_STR " " CUBIC_DEBUG_STR "\n",
__FUNCTION__, CUBIC_DEBUG_DATA(wt.pts()), CUBIC_DEBUG_DATA(wn.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " CUBIC_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], CUBIC_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wtTs) " " PT_DEBUG_STR, n, i[0][n], PT_DEBUG_DATA(i, n));
}
SkDebugf(" wnTs[0]=%g " CUBIC_DEBUG_STR, i[1][0], CUBIC_DEBUG_DATA(wn.pts()));
for (int n = 1; n < pts; ++n) {
SkDebugf(" " TX_DEBUG_STR(wnTs), n, i[1][n]);
}
SkDebugf("\n");
}
static void debugShowCubicIntersection(int pts, const SkIntersectionHelper& wt,
const SkIntersections& i) {
SkASSERT(i.used() == pts);
if (!pts) {
SkDebugf("%s no self intersect " CUBIC_DEBUG_STR "\n", __FUNCTION__,
CUBIC_DEBUG_DATA(wt.pts()));
return;
}
SkDebugf("%s " T_DEBUG_STR(wtTs, 0) " " CUBIC_DEBUG_STR " " PT_DEBUG_STR, __FUNCTION__,
i[0][0], CUBIC_DEBUG_DATA(wt.pts()), PT_DEBUG_DATA(i, 0));
SkDebugf(" " T_DEBUG_STR(wtTs, 1), i[1][0]);
SkDebugf("\n");
}
#else
static void debugShowLineIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowQuadLineIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowQuadIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowCubicLineIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowCubicQuadIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowCubicIntersection(int , const SkIntersectionHelper& ,
const SkIntersectionHelper& , const SkIntersections& ) {
}
static void debugShowCubicIntersection(int , const SkIntersectionHelper& ,
const SkIntersections& ) {
}
#endif
bool AddIntersectTs(SkOpContour* test, SkOpContour* next) {
if (test != next) {
if (AlmostLessUlps(test->bounds().fBottom, next->bounds().fTop)) {
return false;
}
// OPTIMIZATION: outset contour bounds a smidgen instead?
if (!SkPathOpsBounds::Intersects(test->bounds(), next->bounds())) {
return true;
}
}
SkIntersectionHelper wt;
wt.init(test);
bool foundCommonContour = test == next;
do {
SkIntersectionHelper wn;
wn.init(next);
if (test == next && !wn.startAfter(wt)) {
continue;
}
do {
if (!SkPathOpsBounds::Intersects(wt.bounds(), wn.bounds())) {
continue;
}
int pts = 0;
SkIntersections ts;
bool swap = false;
switch (wt.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
swap = true;
switch (wn.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
case SkIntersectionHelper::kVerticalLine_Segment:
case SkIntersectionHelper::kLine_Segment: {
pts = ts.lineHorizontal(wn.pts(), wt.left(),
wt.right(), wt.y(), wt.xFlipped());
debugShowLineIntersection(pts, wn, wt, ts);
break;
}
case SkIntersectionHelper::kQuad_Segment: {
pts = ts.quadHorizontal(wn.pts(), wt.left(),
wt.right(), wt.y(), wt.xFlipped());
debugShowQuadLineIntersection(pts, wn, wt, ts);
break;
}
case SkIntersectionHelper::kCubic_Segment: {
pts = ts.cubicHorizontal(wn.pts(), wt.left(),
wt.right(), wt.y(), wt.xFlipped());
debugShowCubicLineIntersection(pts, wn, wt, ts);
break;
}
default:
SkASSERT(0);
}
break;
case SkIntersectionHelper::kVerticalLine_Segment:
swap = true;
switch (wn.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
case SkIntersectionHelper::kVerticalLine_Segment:
case SkIntersectionHelper::kLine_Segment: {
pts = ts.lineVertical(wn.pts(), wt.top(),
wt.bottom(), wt.x(), wt.yFlipped());
debugShowLineIntersection(pts, wn, wt, ts);
break;
}
case SkIntersectionHelper::kQuad_Segment: {
pts = ts.quadVertical(wn.pts(), wt.top(),
wt.bottom(), wt.x(), wt.yFlipped());
debugShowQuadLineIntersection(pts, wn, wt, ts);
break;
}
case SkIntersectionHelper::kCubic_Segment: {
pts = ts.cubicVertical(wn.pts(), wt.top(),
wt.bottom(), wt.x(), wt.yFlipped());
debugShowCubicLineIntersection(pts, wn, wt, ts);
break;
}
default:
SkASSERT(0);
}
break;
case SkIntersectionHelper::kLine_Segment:
switch (wn.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
pts = ts.lineHorizontal(wt.pts(), wn.left(),
wn.right(), wn.y(), wn.xFlipped());
debugShowLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kVerticalLine_Segment:
pts = ts.lineVertical(wt.pts(), wn.top(),
wn.bottom(), wn.x(), wn.yFlipped());
debugShowLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kLine_Segment: {
pts = ts.lineLine(wt.pts(), wn.pts());
debugShowLineIntersection(pts, wt, wn, ts);
break;
}
case SkIntersectionHelper::kQuad_Segment: {
swap = true;
pts = ts.quadLine(wn.pts(), wt.pts());
debugShowQuadLineIntersection(pts, wn, wt, ts);
break;
}
case SkIntersectionHelper::kCubic_Segment: {
swap = true;
pts = ts.cubicLine(wn.pts(), wt.pts());
debugShowCubicLineIntersection(pts, wn, wt, ts);
break;
}
default:
SkASSERT(0);
}
break;
case SkIntersectionHelper::kQuad_Segment:
switch (wn.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
pts = ts.quadHorizontal(wt.pts(), wn.left(),
wn.right(), wn.y(), wn.xFlipped());
debugShowQuadLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kVerticalLine_Segment:
pts = ts.quadVertical(wt.pts(), wn.top(),
wn.bottom(), wn.x(), wn.yFlipped());
debugShowQuadLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kLine_Segment: {
pts = ts.quadLine(wt.pts(), wn.pts());
debugShowQuadLineIntersection(pts, wt, wn, ts);
break;
}
case SkIntersectionHelper::kQuad_Segment: {
pts = ts.quadQuad(wt.pts(), wn.pts());
debugShowQuadIntersection(pts, wt, wn, ts);
break;
}
case SkIntersectionHelper::kCubic_Segment: {
swap = true;
pts = ts.cubicQuad(wn.pts(), wt.pts());
debugShowCubicQuadIntersection(pts, wn, wt, ts);
break;
}
default:
SkASSERT(0);
}
break;
case SkIntersectionHelper::kCubic_Segment:
switch (wn.segmentType()) {
case SkIntersectionHelper::kHorizontalLine_Segment:
pts = ts.cubicHorizontal(wt.pts(), wn.left(),
wn.right(), wn.y(), wn.xFlipped());
debugShowCubicLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kVerticalLine_Segment:
pts = ts.cubicVertical(wt.pts(), wn.top(),
wn.bottom(), wn.x(), wn.yFlipped());
debugShowCubicLineIntersection(pts, wt, wn, ts);
break;
case SkIntersectionHelper::kLine_Segment: {
pts = ts.cubicLine(wt.pts(), wn.pts());
debugShowCubicLineIntersection(pts, wt, wn, ts);
break;
}
case SkIntersectionHelper::kQuad_Segment: {
pts = ts.cubicQuad(wt.pts(), wn.pts());
debugShowCubicQuadIntersection(pts, wt, wn, ts);
break;
}
case SkIntersectionHelper::kCubic_Segment: {
pts = ts.cubicCubic(wt.pts(), wn.pts());
debugShowCubicIntersection(pts, wt, wn, ts);
break;
}
default:
SkASSERT(0);
}
break;
default:
SkASSERT(0);
}
if (!foundCommonContour && pts > 0) {
test->addCross(next);
next->addCross(test);
foundCommonContour = true;
}
// in addition to recording T values, record matching segment
if (pts == 2) {
if (wn.segmentType() <= SkIntersectionHelper::kLine_Segment
&& wt.segmentType() <= SkIntersectionHelper::kLine_Segment) {
if (wt.addCoincident(wn, ts, swap)) {
continue;
}
ts.cleanUpCoincidence(); // prefer (t == 0 or t == 1)
pts = 1;
} else if (wn.segmentType() >= SkIntersectionHelper::kQuad_Segment
&& wt.segmentType() >= SkIntersectionHelper::kQuad_Segment
&& ts.isCoincident(0)) {
SkASSERT(ts.coincidentUsed() == 2);
if (wt.addCoincident(wn, ts, swap)) {
continue;
}
ts.cleanUpCoincidence(); // prefer (t == 0 or t == 1)
pts = 1;
}
}
if (pts >= 2) {
for (int pt = 0; pt < pts - 1; ++pt) {
const SkDPoint& point = ts.pt(pt);
const SkDPoint& next = ts.pt(pt + 1);
if (wt.isPartial(ts[swap][pt], ts[swap][pt + 1], point, next)
&& wn.isPartial(ts[!swap][pt], ts[!swap][pt + 1], point, next)) {
if (!wt.addPartialCoincident(wn, ts, pt, swap)) {
// remove extra point if two map to same float values
ts.cleanUpCoincidence(); // prefer (t == 0 or t == 1)
pts = 1;
}
}
}
}
for (int pt = 0; pt < pts; ++pt) {
SkASSERT(ts[0][pt] >= 0 && ts[0][pt] <= 1);
SkASSERT(ts[1][pt] >= 0 && ts[1][pt] <= 1);
SkPoint point = ts.pt(pt).asSkPoint();
wt.alignTPt(wn, swap, pt, &ts, &point);
int testTAt = wt.addT(wn, point, ts[swap][pt]);
int nextTAt = wn.addT(wt, point, ts[!swap][pt]);
wt.addOtherT(testTAt, ts[!swap][pt], nextTAt);
wn.addOtherT(nextTAt, ts[swap][pt], testTAt);
}
} while (wn.advance());
} while (wt.advance());
return true;
}
void AddSelfIntersectTs(SkOpContour* test) {
SkIntersectionHelper wt;
wt.init(test);
do {
if (wt.segmentType() != SkIntersectionHelper::kCubic_Segment) {
continue;
}
SkIntersections ts;
int pts = ts.cubic(wt.pts());
debugShowCubicIntersection(pts, wt, ts);
if (!pts) {
continue;
}
SkASSERT(pts == 1);
SkASSERT(ts[0][0] >= 0 && ts[0][0] <= 1);
SkASSERT(ts[1][0] >= 0 && ts[1][0] <= 1);
SkPoint point = ts.pt(0).asSkPoint();
int testTAt = wt.addSelfT(point, ts[0][0]);
int nextTAt = wt.addSelfT(point, ts[1][0]);
wt.addOtherT(testTAt, ts[1][0], nextTAt);
wt.addOtherT(nextTAt, ts[0][0], testTAt);
} while (wt.advance());
}
// resolve any coincident pairs found while intersecting, and
// see if coincidence is formed by clipping non-concident segments
bool CoincidenceCheck(SkTArray<SkOpContour*, true>* contourList, int total) {
int contourCount = (*contourList).count();
for (int cIndex = 0; cIndex < contourCount; ++cIndex) {
SkOpContour* contour = (*contourList)[cIndex];
contour->resolveNearCoincidence();
}
for (int cIndex = 0; cIndex < contourCount; ++cIndex) {
SkOpContour* contour = (*contourList)[cIndex];
contour->addCoincidentPoints();
}
for (int cIndex = 0; cIndex < contourCount; ++cIndex) {
SkOpContour* contour = (*contourList)[cIndex];
if (!contour->calcCoincidentWinding()) {
return false;
}
}
for (int cIndex = 0; cIndex < contourCount; ++cIndex) {
SkOpContour* contour = (*contourList)[cIndex];
contour->calcPartialCoincidentWinding();
}
return true;
}
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