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c0747bb211
skia2/tests/PathOpsAngleTest.cpp
Cary Clark 9d6049a96f fix pathops bug 8380 
Paths to intersect have two nearly coincident cubics. Where they
cross, the intersection error makes the curves start at slightly
different points. To sort the intersection, one curve is translated
to the start of the opposite point, moving it from one side to the
other, introducing a winding error.

The fix looks for that error in a very tiny range (enlarging that
range causes other tests that now pass to fail). This fix is very
fragile and points to the need for a better approach than sorting
angles to find winding values, as documented in the bug.

Also renamed some angle functions to show that they operate only
on lines and not general curves.

All tests pass with this fix:
./out/release/pathops_unittest -V -x
./out/debug/pathops_unittest -V -x

TBR=reed@google.com
Bug: skia:8380
Change-Id: I04e53d4c6a96035f661a4c9f31a17055ce13e3eb
Reviewed-on: https://skia-review.googlesource.com/c/179241
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
2018-12-21 19:15:54 +00:00

530 lines
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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.
*/
#include "PathOpsTestCommon.h"
#include "SkIntersections.h"
#include "SkOpContour.h"
#include "SkOpSegment.h"
#include "SkRandom.h"
#include "SkTSort.h"
#include "Test.h"
static bool gDisableAngleTests = true;
static float next(float f)
{
int fBits = SkFloatAs2sCompliment(f);
++fBits;
float fNext = Sk2sComplimentAsFloat(fBits);
return fNext;
}
static float prev(float f)
{
int fBits = SkFloatAs2sCompliment(f);
--fBits;
float fNext = Sk2sComplimentAsFloat(fBits);
return fNext;
}
DEF_TEST(PathOpsAngleFindCrossEpsilon, reporter) {
if (gDisableAngleTests) {
return;
}
SkRandom ran;
int maxEpsilon = 0;
for (int index = 0; index < 10000000; ++index) {
SkDLine line = {{{0, 0}, {ran.nextRangeF(0.0001f, 1000), ran.nextRangeF(0.0001f, 1000)}}};
for (int inner = 0; inner < 10; ++inner) {
float t = ran.nextRangeF(0.0001f, 1);
SkDPoint dPt = line.ptAtT(t);
SkPoint pt = dPt.asSkPoint();
float xs[3] = { prev(pt.fX), pt.fX, next(pt.fX) };
float ys[3] = { prev(pt.fY), pt.fY, next(pt.fY) };
for (int xIdx = 0; xIdx < 3; ++xIdx) {
for (int yIdx = 0; yIdx < 3; ++yIdx) {
SkPoint test = { xs[xIdx], ys[yIdx] };
float p1 = SkDoubleToScalar(line[1].fX * test.fY);
float p2 = SkDoubleToScalar(line[1].fY * test.fX);
int p1Bits = SkFloatAs2sCompliment(p1);
int p2Bits = SkFloatAs2sCompliment(p2);
int epsilon = SkTAbs(p1Bits - p2Bits);
if (maxEpsilon < epsilon) {
SkDebugf("line={{0, 0}, {%1.7g, %1.7g}} t=%1.7g pt={%1.7g, %1.7g}"
" epsilon=%d\n",
line[1].fX, line[1].fY, t, test.fX, test.fY, epsilon);
maxEpsilon = epsilon;
}
}
}
}
}
}
DEF_TEST(PathOpsAngleFindQuadEpsilon, reporter) {
if (gDisableAngleTests) {
return;
}
SkRandom ran;
int maxEpsilon = 0;
double maxAngle = 0;
for (int index = 0; index < 100000; ++index) {
SkDLine line = {{{0, 0}, {ran.nextRangeF(0.0001f, 1000), ran.nextRangeF(0.0001f, 1000)}}};
float t = ran.nextRangeF(0.0001f, 1);
SkDPoint dPt = line.ptAtT(t);
float t2 = ran.nextRangeF(0.0001f, 1);
SkDPoint qPt = line.ptAtT(t2);
float t3 = ran.nextRangeF(0.0001f, 1);
SkDPoint qPt2 = line.ptAtT(t3);
qPt.fX += qPt2.fY;
qPt.fY -= qPt2.fX;
QuadPts q = {{line[0], dPt, qPt}};
SkDQuad quad;
quad.debugSet(q.fPts);
// binary search for maximum movement of quad[1] towards test that still has 1 intersection
double moveT = 0.5f;
double deltaT = moveT / 2;
SkDPoint last;
do {
last = quad[1];
quad[1].fX = dPt.fX - line[1].fY * moveT;
quad[1].fY = dPt.fY + line[1].fX * moveT;
SkIntersections i;
i.intersect(quad, line);
REPORTER_ASSERT(reporter, i.used() > 0);
if (i.used() == 1) {
moveT += deltaT;
} else {
moveT -= deltaT;
}
deltaT /= 2;
} while (last.asSkPoint() != quad[1].asSkPoint());
float p1 = SkDoubleToScalar(line[1].fX * last.fY);
float p2 = SkDoubleToScalar(line[1].fY * last.fX);
int p1Bits = SkFloatAs2sCompliment(p1);
int p2Bits = SkFloatAs2sCompliment(p2);
int epsilon = SkTAbs(p1Bits - p2Bits);
if (maxEpsilon < epsilon) {
SkDebugf("line={{0, 0}, {%1.7g, %1.7g}} t=%1.7g/%1.7g/%1.7g moveT=%1.7g"
" pt={%1.7g, %1.7g} epsilon=%d\n",
line[1].fX, line[1].fY, t, t2, t3, moveT, last.fX, last.fY, epsilon);
maxEpsilon = epsilon;
}
double a1 = atan2(line[1].fY, line[1].fX);
double a2 = atan2(last.fY, last.fX);
double angle = fabs(a1 - a2);
if (maxAngle < angle) {
SkDebugf("line={{0, 0}, {%1.7g, %1.7g}} t=%1.7g/%1.7g/%1.7g moveT=%1.7g"
" pt={%1.7g, %1.7g} angle=%1.7g\n",
line[1].fX, line[1].fY, t, t2, t3, moveT, last.fX, last.fY, angle);
maxAngle = angle;
}
}
}
static int find_slop(double x, double y, double rx, double ry) {
int slopBits = 0;
bool less1, less2;
double absX = fabs(x);
double absY = fabs(y);
double length = absX < absY ? absX / 2 + absY : absX + absY / 2;
int exponent;
(void) frexp(length, &exponent);
double epsilon = ldexp(FLT_EPSILON, exponent);
do {
// get the length as the larger plus half the smaller (both same signs)
// find the ulps of the length
// compute the offsets from there
double xSlop = epsilon * slopBits;
double ySlop = x * y < 0 ? -xSlop : xSlop; // OPTIMIZATION: use copysign / _copysign ?
double x1 = x - xSlop;
double y1 = y + ySlop;
double x_ry1 = x1 * ry;
double rx_y1 = rx * y1;
less1 = x_ry1 < rx_y1;
double x2 = x + xSlop;
double y2 = y - ySlop;
double x_ry2 = x2 * ry;
double rx_y2 = rx * y2;
less2 = x_ry2 < rx_y2;
} while (less1 == less2 && ++slopBits);
return slopBits;
}
// from http://stackoverflow.com/questions/1427422/cheap-algorithm-to-find-measure-of-angle-between-vectors
static double diamond_angle(double y, double x)
{
if (y >= 0)
return (x >= 0 ? y/(x+y) : 1-x/(-x+y));
else
return (x < 0 ? 2-y/(-x-y) : 3+x/(x-y));
}
static const double slopTests[][4] = {
// x y rx ry
{-0.058554756452593892, -0.18804585843827226, -0.018568569646021160, -0.059615294434479438},
{-0.0013717412948608398, 0.0041152238845825195, -0.00045837944195925573, 0.0013753175735478074},
{-2.1033774145221198, -1.4046019261273715e-008, -0.70062688352066704, -1.2706324683777995e-008},
};
DEF_TEST(PathOpsAngleFindSlop, reporter) {
if (gDisableAngleTests) {
return;
}
for (int index = 0; index < (int) SK_ARRAY_COUNT(slopTests); ++index) {
const double* slopTest = slopTests[index];
double x = slopTest[0];
double y = slopTest[1];
double rx = slopTest[2];
double ry = slopTest[3];
SkDebugf("%s xy %d=%d\n", __FUNCTION__, index, find_slop(x, y, rx, ry));
SkDebugf("%s rxy %d=%d\n", __FUNCTION__, index, find_slop(rx, ry, x, y));
double angle = diamond_angle(y, x);
double rAngle = diamond_angle(ry, rx);
double diff = fabs(angle - rAngle);
SkDebugf("%s diamond xy=%1.9g rxy=%1.9g diff=%1.9g factor=%d\n", __FUNCTION__,
angle, rAngle, diff, (int) (diff / FLT_EPSILON));
}
}
class PathOpsAngleTester {
public:
static int After(SkOpAngle& lh, SkOpAngle& rh) {
return lh.after(&rh);
}
static int AllOnOneSide(SkOpAngle& lh, SkOpAngle& rh) {
return lh.lineOnOneSide(&rh, false);
}
static int ConvexHullOverlaps(SkOpAngle& lh, SkOpAngle& rh) {
return lh.convexHullOverlaps(&rh);
}
static int Orderable(SkOpAngle& lh, SkOpAngle& rh) {
return lh.orderable(&rh);
}
static int EndsIntersect(SkOpAngle& lh, SkOpAngle& rh) {
return lh.endsIntersect(&rh);
}
static void SetNext(SkOpAngle& lh, SkOpAngle& rh) {
lh.fNext = &rh;
}
};
class PathOpsSegmentTester {
public:
static void DebugReset(SkOpSegment* segment) {
segment->debugReset();
}
};
struct CircleData {
const CubicPts fPts;
const int fPtCount;
SkPoint fShortPts[4];
};
static CircleData circleDataSet[] = {
{ {{{313.0155029296875, 207.90290832519531}, {320.05078125, 227.58743286132812}}}, 2, {} },
{ {{{313.0155029296875, 207.90290832519531}, {313.98246891063195, 219.33615203830394},
{320.05078125, 227.58743286132812}}}, 3, {} },
};
static const int circleDataSetSize = (int) SK_ARRAY_COUNT(circleDataSet);
DEF_TEST(PathOpsAngleCircle, reporter) {
SkSTArenaAlloc<4096> allocator;
SkOpContourHead contour;
SkOpGlobalState state(&contour, &allocator SkDEBUGPARAMS(false) SkDEBUGPARAMS(nullptr));
contour.init(&state, false, false);
for (int index = 0; index < circleDataSetSize; ++index) {
CircleData& data = circleDataSet[index];
for (int idx2 = 0; idx2 < data.fPtCount; ++idx2) {
data.fShortPts[idx2] = data.fPts.fPts[idx2].asSkPoint();
}
switch (data.fPtCount) {
case 2:
contour.addLine(data.fShortPts);
break;
case 3:
contour.addQuad(data.fShortPts);
break;
case 4:
contour.addCubic(data.fShortPts);
break;
}
}
SkOpSegment* first = contour.first();
first->debugAddAngle(0, 1);
SkOpSegment* next = first->next();
next->debugAddAngle(0, 1);
PathOpsAngleTester::Orderable(*first->debugLastAngle(), *next->debugLastAngle());
}
struct IntersectData {
const CubicPts fPts;
const int fPtCount;
double fTStart;
double fTEnd;
SkPoint fShortPts[4];
};
static IntersectData intersectDataSet1[] = {
{ {{{322.935669,231.030273}, {312.832214,220.393295}, {312.832214,203.454178}}}, 3,
0.865309956, 0.154740299, {} },
{ {{{322.12738,233.397751}, {295.718353,159.505829}}}, 2,
0.345028807, 0.0786326511, {} },
{ {{{322.935669,231.030273}, {312.832214,220.393295}, {312.832214,203.454178}}}, 3,
0.865309956, 1, {} },
{ {{{322.12738,233.397751}, {295.718353,159.505829}}}, 2,
0.345028807, 1, {} },
};
static IntersectData intersectDataSet2[] = {
{ {{{364.390686,157.898193}, {375.281769,136.674606}, {396.039917,136.674606}}}, 3,
0.578520747, 1, {} },
{ {{{364.390686,157.898193}, {375.281769,136.674606}, {396.039917,136.674606}}}, 3,
0.578520747, 0.536512973, {} },
{ {{{366.608826,151.196014}, {378.803101,136.674606}, {398.164948,136.674606}}}, 3,
0.490456543, 1, {} },
};
static IntersectData intersectDataSet3[] = {
{ {{{2.000000,0.000000}, {1.33333333,0.66666667}}}, 2, 1, 0, {} },
{ {{{1.33333333,0.66666667}, {0.000000,2.000000}}}, 2, 0, 0.25, {} },
{ {{{2.000000,2.000000}, {1.33333333,0.66666667}}}, 2, 1, 0, {} },
};
static IntersectData intersectDataSet4[] = {
{ {{{1.3333333,0.6666667}, {0.000,2.000}}}, 2, 0.250000006, 0, {} },
{ {{{1.000,0.000}, {1.000,1.000}}}, 2, 1, 0, {} },
{ {{{1.000,1.000}, {0.000,0.000}}}, 2, 0, 1, {} },
};
static IntersectData intersectDataSet5[] = {
{ {{{0.000,0.000}, {1.000,0.000}, {1.000,1.000}}}, 3, 1, 0.666666667, {} },
{ {{{0.000,0.000}, {2.000,1.000}, {0.000,2.000}}}, 3, 0.5, 1, {} },
{ {{{0.000,0.000}, {2.000,1.000}, {0.000,2.000}}}, 3, 0.5, 0, {} },
};
static IntersectData intersectDataSet6[] = { // pathops_visualizer.htm:3658
{ {{{0.000,1.000}, {3.000,4.000}, {1.000,0.000}, {3.000,0.000}}}, 4, 0.0925339054, 0, {} }, // pathops_visualizer.htm:3616
{ {{{0.000,1.000}, {0.000,3.000}, {1.000,0.000}, {4.000,3.000}}}, 4, 0.453872386, 0, {} }, // pathops_visualizer.htm:3616
{ {{{0.000,1.000}, {3.000,4.000}, {1.000,0.000}, {3.000,0.000}}}, 4, 0.0925339054, 0.417096368, {} }, // pathops_visualizer.htm:3616
};
static IntersectData intersectDataSet7[] = { // pathops_visualizer.htm:3748
{ {{{2.000,1.000}, {0.000,1.000}}}, 2, 0.5, 0, {} }, // pathops_visualizer.htm:3706
{ {{{2.000,0.000}, {0.000,2.000}}}, 2, 0.5, 1, {} }, // pathops_visualizer.htm:3706
{ {{{0.000,1.000}, {0.000,2.000}, {2.000,0.000}, {2.000,1.000}}}, 4, 0.5, 1, {} }, // pathops_visualizer.htm:3706
}; //
static IntersectData intersectDataSet8[] = { // pathops_visualizer.htm:4194
{ {{{0.000,1.000}, {2.000,3.000}, {5.000,1.000}, {4.000,3.000}}}, 4, 0.311007457, 0.285714286, {} }, // pathops_visualizer.htm:4152
{ {{{1.000,5.000}, {3.000,4.000}, {1.000,0.000}, {3.000,2.000}}}, 4, 0.589885081, 0.999982974, {} }, // pathops_visualizer.htm:4152
{ {{{1.000,5.000}, {3.000,4.000}, {1.000,0.000}, {3.000,2.000}}}, 4, 0.589885081, 0.576935809, {} }, // pathops_visualizer.htm:4152
}; //
static IntersectData intersectDataSet9[] = { // pathops_visualizer.htm:4142
{ {{{0.000,1.000}, {2.000,3.000}, {5.000,1.000}, {4.000,3.000}}}, 4, 0.476627072, 0.311007457, {} }, // pathops_visualizer.htm:4100
{ {{{1.000,5.000}, {3.000,4.000}, {1.000,0.000}, {3.000,2.000}}}, 4, 0.999982974, 1, {} }, // pathops_visualizer.htm:4100
{ {{{0.000,1.000}, {2.000,3.000}, {5.000,1.000}, {4.000,3.000}}}, 4, 0.476627072, 1, {} }, // pathops_visualizer.htm:4100
}; //
static IntersectData intersectDataSet10[] = { // pathops_visualizer.htm:4186
{ {{{0.000,1.000}, {1.000,6.000}, {1.000,0.000}, {1.000,0.000}}}, 4, 0.788195121, 0.726275769, {} }, // pathops_visualizer.htm:4144
{ {{{0.000,1.000}, {0.000,1.000}, {1.000,0.000}, {6.000,1.000}}}, 4, 0.473378977, 1, {} }, // pathops_visualizer.htm:4144
{ {{{0.000,1.000}, {1.000,6.000}, {1.000,0.000}, {1.000,0.000}}}, 4, 0.788195121, 1, {} }, // pathops_visualizer.htm:4144
}; //
static IntersectData intersectDataSet11[] = { // pathops_visualizer.htm:4704
{ {{{979.305,561.000}, {1036.695,291.000}}}, 2, 0.888888874, 0.11111108, {} }, // pathops_visualizer.htm:4662
{ {{{1006.695,291.000}, {1023.264,291.000}, {1033.840,304.431}, {1030.318,321.000}}}, 4, 1, 0, {} }, // pathops_visualizer.htm:4662
{ {{{979.305,561.000}, {1036.695,291.000}}}, 2, 0.888888874, 1, {} }, // pathops_visualizer.htm:4662
}; //
static IntersectData intersectDataSet12[] = { // pathops_visualizer.htm:5481
{ {{{67.000,912.000}, {67.000,913.000}}}, 2, 1, 0, {} }, // pathops_visualizer.htm:5439
{ {{{67.000,913.000}, {67.000,917.389}, {67.224,921.726}, {67.662,926.000}}}, 4, 0, 1, {} }, // pathops_visualizer.htm:5439
{ {{{194.000,1041.000}, {123.860,1041.000}, {67.000,983.692}, {67.000,913.000}}}, 4, 1, 0, {} }, // pathops_visualizer.htm:5439
}; //
static IntersectData intersectDataSet13[] = { // pathops_visualizer.htm:5735
{ {{{6.000,0.000}, {0.000,4.000}}}, 2, 0.625, 0.25, {} }, // pathops_visualizer.htm:5693
{ {{{0.000,1.000}, {0.000,6.000}, {4.000,0.000}, {6.000,1.000}}}, 4, 0.5, 0.833333333, {} }, // pathops_visualizer.htm:5693
{ {{{0.000,1.000}, {0.000,6.000}, {4.000,0.000}, {6.000,1.000}}}, 4, 0.5, 0.379043969, {} }, // pathops_visualizer.htm:5693
}; //
static IntersectData intersectDataSet14[] = { // pathops_visualizer.htm:5875
{ {{{0.000,1.000}, {4.000,6.000}, {2.000,1.000}, {2.000,0.000}}}, 4, 0.0756502183, 0.0594570973, {} }, // pathops_visualizer.htm:5833
{ {{{1.000,2.000}, {0.000,2.000}, {1.000,0.000}, {6.000,4.000}}}, 4, 0.0756502184, 0, {} }, // pathops_visualizer.htm:5833
{ {{{0.000,1.000}, {4.000,6.000}, {2.000,1.000}, {2.000,0.000}}}, 4, 0.0756502183, 0.531917258, {} }, // pathops_visualizer.htm:5833
}; //
static IntersectData intersectDataSet15[] = { // pathops_visualizer.htm:6580
{ {{{490.435,879.407}, {405.593,909.436}}}, 2, 0.500554405, 1, {} }, // pathops_visualizer.htm:6538
{ {{{447.967,894.438}, {448.007,894.424}, {448.014,894.422}}}, 3, 0, 1, {} }, // pathops_visualizer.htm:6538
{ {{{490.435,879.407}, {405.593,909.436}}}, 2, 0.500554405, 0.500000273, {} }, // pathops_visualizer.htm:6538
}; //
static IntersectData intersectDataSet16[] = { // pathops_visualizer.htm:7419
{ {{{1.000,4.000}, {4.000,5.000}, {3.000,2.000}, {6.000,3.000}}}, 4, 0.5, 0, {} }, // pathops_visualizer.htm:7377
{ {{{2.000,3.000}, {3.000,6.000}, {4.000,1.000}, {5.000,4.000}}}, 4, 0.5, 0.112701665, {} }, // pathops_visualizer.htm:7377
{ {{{5.000,4.000}, {2.000,3.000}}}, 2, 0.5, 0, {} }, // pathops_visualizer.htm:7377
}; //
// from skpi_gino_com_16
static IntersectData intersectDataSet17[] = {
{ /*seg=7*/ {{{270.974121f, 770.025879f}, {234.948273f, 734}, {184, 734}}}
, 3, 0.74590454, 0.547660352, {} },
{ /*seg=8*/ {{{185, 734}, {252.93103f, 734}, {308, 789.06897f}, {308, 857}}}
, 4, 0.12052623, 0, {} },
{ /*seg=7*/ {{{270.974121f, 770.025879f}, {234.948273f, 734}, {184, 734}}}
, 3, 0.74590454, 1, {} },
};
static IntersectData intersectDataSet18[] = {
{ /*seg=7*/ {{{270.974121f, 770.025879f}, {234.948273f, 734}, {184, 734}}}
, 3, 0.74590454, 1, {} },
{ /*seg=8*/ {{{185, 734}, {252.93103f, 734}, {308, 789.06897f}, {308, 857}}}
, 4, 0.12052623, 0.217351928, {} },
{ /*seg=7*/ {{{270.974121f, 770.025879f}, {234.948273f, 734}, {184, 734}}}
, 3, 0.74590454, 0.547660352, {} },
};
static IntersectData intersectDataSet19[] = {
{ /*seg=1*/ {{{0, 1}, {3, 5}, {2, 1}, {3, 1}}}
, 4, 0.135148995, 0.134791946, {} },
{ /*seg=3*/ {{{1, 2}, {1, 2.15061641f}, {1, 2.21049166f}, {1.01366711f, 2.21379328f}}}
, 4, 0.956740456, 0.894913214, {} },
{ /*seg=1*/ {{{0, 1}, {3, 5}, {2, 1}, {3, 1}}}
, 4, 0.135148995, 0.551812363, {} },
};
#define I(x) intersectDataSet##x
static IntersectData* intersectDataSets[] = {
I(1), I(2), I(3), I(4), I(5), I(6), I(7), I(8), I(9), I(10),
I(11), I(12), I(13), I(14), I(15), I(16), I(17), I(18), I(19),
};
#undef I
#define I(x) (int) SK_ARRAY_COUNT(intersectDataSet##x)
static const int intersectDataSetSizes[] = {
I(1), I(2), I(3), I(4), I(5), I(6), I(7), I(8), I(9), I(10),
I(11), I(12), I(13), I(14), I(15), I(16), I(17), I(18), I(19),
};
#undef I
static const int intersectDataSetsSize = (int) SK_ARRAY_COUNT(intersectDataSetSizes);
struct FourPoints {
SkPoint pts[4];
};
DEF_TEST(PathOpsAngleAfter, reporter) {
SkSTArenaAlloc<4096> allocator;
SkOpContourHead contour;
SkOpGlobalState state(&contour, &allocator SkDEBUGPARAMS(false) SkDEBUGPARAMS(nullptr));
contour.init(&state, false, false);
for (int index = intersectDataSetsSize - 1; index >= 0; --index) {
IntersectData* dataArray = intersectDataSets[index];
const int dataSize = intersectDataSetSizes[index];
for (int index2 = 0; index2 < dataSize - 2; ++index2) {
allocator.reset();
contour.reset();
for (int index3 = 0; index3 < 3; ++index3) {
IntersectData& data = dataArray[index2 + index3];
SkPoint* temp = (SkPoint*) allocator.make<FourPoints>();
for (int idx2 = 0; idx2 < data.fPtCount; ++idx2) {
temp[idx2] = data.fPts.fPts[idx2].asSkPoint();
}
switch (data.fPtCount) {
case 2: {
contour.addLine(temp);
} break;
case 3: {
contour.addQuad(temp);
} break;
case 4: {
contour.addCubic(temp);
} break;
}
}
SkOpSegment* seg1 = contour.first();
seg1->debugAddAngle(dataArray[index2 + 0].fTStart, dataArray[index2 + 0].fTEnd);
SkOpSegment* seg2 = seg1->next();
seg2->debugAddAngle(dataArray[index2 + 1].fTStart, dataArray[index2 + 1].fTEnd);
SkOpSegment* seg3 = seg2->next();
seg3->debugAddAngle(dataArray[index2 + 2].fTStart, dataArray[index2 + 2].fTEnd);
SkOpAngle& angle1 = *seg1->debugLastAngle();
SkOpAngle& angle2 = *seg2->debugLastAngle();
SkOpAngle& angle3 = *seg3->debugLastAngle();
PathOpsAngleTester::SetNext(angle1, angle3);
// These data sets are seeded when the set itself fails, so likely the dataset does not
// match the expected result. The tests above return 1 when first added, but
// return 0 after the bug is fixed.
SkDEBUGCODE(int result =) PathOpsAngleTester::After(angle2, angle1);
SkASSERT(result == 0 || result == 1);
}
}
}
void SkOpSegment::debugAddAngle(double startT, double endT) {
SkOpPtT* startPtT = startT == 0 ? fHead.ptT() : startT == 1 ? fTail.ptT()
: this->addT(startT);
SkOpPtT* endPtT = endT == 0 ? fHead.ptT() : endT == 1 ? fTail.ptT()
: this->addT(endT);
SkOpAngle* angle = this->globalState()->allocator()->make<SkOpAngle>();
SkOpSpanBase* startSpan = &fHead;
while (startSpan->ptT() != startPtT) {
startSpan = startSpan->upCast()->next();
}
SkOpSpanBase* endSpan = &fHead;
while (endSpan->ptT() != endPtT) {
endSpan = endSpan->upCast()->next();
}
angle->set(startSpan, endSpan);
if (startT < endT) {
startSpan->upCast()->setToAngle(angle);
endSpan->setFromAngle(angle);
} else {
endSpan->upCast()->setToAngle(angle);
startSpan->setFromAngle(angle);
}
}
DEF_TEST(PathOpsAngleAllOnOneSide, reporter) {
SkSTArenaAlloc<4096> allocator;
SkOpContourHead contour;
SkOpGlobalState state(&contour, &allocator SkDEBUGPARAMS(false) SkDEBUGPARAMS(nullptr));
contour.init(&state, false, false);
SkPoint conicPts[3] = {{494.37100219726562f, 224.66200256347656f},
{494.37360910682298f, 224.6729026561527f},
{494.37600708007813f, 224.68400573730469f}};
SkPoint linePts[2] = {{494.371002f, 224.662003f}, {494.375000f, 224.675995f}};
for (int i = 10; i >= 0; --i) {
SkPoint modLinePts[2] = { linePts[0], linePts[1] };
modLinePts[1].fX += i * .1f;
contour.addLine(modLinePts);
contour.addQuad(conicPts);
// contour.addConic(conicPts, 0.999935746f, &allocator);
SkOpSegment* first = contour.first();
first->debugAddAngle(0, 1);
SkOpSegment* next = first->next();
next->debugAddAngle(0, 1);
/* int result = */
PathOpsAngleTester::AllOnOneSide(*first->debugLastAngle(), *next->debugLastAngle());
// SkDebugf("i=%d result=%d\n", i , result);
// SkDebugf("");
}
}
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