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skia2/tests/PathOpsQuadIntersectionTest.cpp
commit-bot@chromium.org 4431e7757c Mike R: please sanity check SkPostConfig.h 
Mike K: please sanity check Test.cpp and skia_test.cpp

Feel free to look at the rest, but I don't expect any in depth review of path ops innards.

Path Ops first iteration used QuickSort to order segments radiating from an intersection to compute the winding rule.

This revision uses a circular sort instead. Breaking out the circular sort into its own long-lived structure (SkOpAngle) allows doing less work and provides a home for caching additional sorting data.

The circle sort is more stable than the former sort, has a robust ordering and fewer exceptions. It finds unsortable ordering less often. It is less reliant on the initial curve  tangent, using convex hulls instead whenever it can.

Additional debug validation makes sure that the computed structures are self-consistent. A new visualization tool helps verify that the angle ordering is correct.

The 70+M tests pass with this change on Windows, Mac, Linux 32 and Linux 64 in debug and release.

R=mtklein@google.com, reed@google.com

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/131103009

git-svn-id: http://skia.googlecode.com/svn/trunk@14183 2bbb7eff-a529-9590-31e7-b0007b416f81
2014-04-14 17:08:59 +00:00

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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 "PathOpsQuadIntersectionTestData.h"
#include "PathOpsTestCommon.h"
#include "SkIntersections.h"
#include "SkPathOpsRect.h"
#include "SkReduceOrder.h"
#include "Test.h"
static void standardTestCases(skiatest::Reporter* reporter) {
bool showSkipped = false;
for (size_t index = 0; index < quadraticTests_count; ++index) {
const SkDQuad& quad1 = quadraticTests[index][0];
SkASSERT(ValidQuad(quad1));
const SkDQuad& quad2 = quadraticTests[index][1];
SkASSERT(ValidQuad(quad2));
SkReduceOrder reduce1, reduce2;
int order1 = reduce1.reduce(quad1);
int order2 = reduce2.reduce(quad2);
if (order1 < 3) {
if (showSkipped) {
SkDebugf("[%d] quad1 order=%d\n", static_cast<int>(index), order1);
}
}
if (order2 < 3) {
if (showSkipped) {
SkDebugf("[%d] quad2 order=%d\n", static_cast<int>(index), order2);
}
}
if (order1 == 3 && order2 == 3) {
SkIntersections intersections;
intersections.intersect(quad1, quad2);
if (intersections.used() > 0) {
for (int pt = 0; pt < intersections.used(); ++pt) {
double tt1 = intersections[0][pt];
SkDPoint xy1 = quad1.ptAtT(tt1);
double tt2 = intersections[1][pt];
SkDPoint xy2 = quad2.ptAtT(tt2);
if (!xy1.approximatelyEqual(xy2)) {
SkDebugf("%s [%d,%d] x!= t1=%g (%g,%g) t2=%g (%g,%g)\n",
__FUNCTION__, static_cast<int>(index), pt, tt1, xy1.fX, xy1.fY,
tt2, xy2.fX, xy2.fY);
REPORTER_ASSERT(reporter, 0);
}
}
}
}
}
}
static const SkDQuad testSet[] = {
{{{-708.00779269310044, -154.36998607290101}, {-707.90560262312511, -154.36998607290101}, {-707.8333433370193, -154.44224536635932}}},
{{{-708.00779269310044, -154.61669472244046}, {-701.04513225634582, -128.85970734043804}, {505.58447265625, -504.9130859375}}},
{{{164, -40}, {231.51681518554687, -40}, {279.25839233398438, 7.7416000366210938}}},
{{{279.25839233398438, 7.7416000366210938}, {275.2164306640625, 3.6996400356292725}, {271.03286743164062, -5.3290705182007514e-015}}},
{{{2.9999997378517067, 1.9737872594345709}, {2.9999997432230918, 1.9739647181863822}, {1.2414155459263587e-163, 5.2957833941332142e-315}}},
{{{2.9999047485265304, 1.9739164225694723}, {3.0000947268526112, 1.9738379076623633}, {0.61149411077591886, 0.0028382324376270418}}},
{{{2.9999996843656502, 1.9721416019045801}, {2.9999997725237835, 1.9749798343422071},
{5.3039068214821359e-315, 8.9546185262775165e-307}}},
{{{2.9984791443874976, 1.974505741312242}, {2.9999992702127476, 1.9738772171479178},
{3.0015187977319759, 1.9732495027303418}}},
{{{0.647069409,2.97691634}, {0.946860918,3.17625612}, {1.46875407,2.65105457}}},
{{{0,1}, {0.723699095,2.82756208}, {1.08907197,2.97497449}}},
{{{131.37418,11414.9825}, {130.28798,11415.9328}, {130.042755,11417.4131}}},
{{{130.585787,11418.4142}, {130.021447,11417.8498}, {130,11417}}},
{{{130.73167037963867, 11418.546386718750}, {131.26360225677490, 11418.985778808592},
{132, 11419 }}},
{{{132, 11419}, {131.15012693405151, 11418.978546142578},
{130.58578681945801, 11418.414184570313}}},
{{{132, 11419},
{130.73167037963867, 11418.546386718750}, {131.26360225677490, 11418.985778808592}}},
{{{131.15012693405151, 11418.978546142578},
{130.58578681945801, 11418.414184570313}, {132, 11419}}},
{{{3.0774019473063863, 3.35198509346713}, {3.0757503498668397, 3.327320623945933},
{3.0744102085015879, 3.3025879417907196}}},
{{{3.053913680774329, 3.3310471586283938}, {3.0758730889691694, 3.3273466070370152},
{3.0975671980059394, 3.3235031316554351}}},
{{{3.39068129, 4.44939202}, {3.03659239, 3.81843234}, {3.06844529, 3.02100922}}},
{{{2.10714698, 3.44196686}, {3.12180288, 3.38575704}, {3.75968569, 3.1281838}}},
{{{2.74792918, 4.77711896}, {2.82236867, 4.23882547}, {2.82848144, 3.63729341}}},
{{{2.62772567, 3.64823958}, {3.46652495, 3.64258364}, {4.1425079, 3.48623815}}},
{{{1.34375, 2.03125}, {2.2734375, 2.6640625}, {3.25, 3.25}}},
{{{3.96875, 4.65625}, {3.3359375, 3.7265625}, {2.75, 2.75}}},
{{{0, 1}, {0.324417544, 2.27953848}, {0.664376547, 2.58940267}}},
{{{1, 2}, {0.62109375, 2.70703125}, {0.640625, 2.546875}}},
{{{1, 2}, {0.984375, 2.3359375}, {1.0625, 2.15625}}},
{{{0, 1}, {0.983539095, 2.30041152}, {1.47325103, 2.61316872}}},
{{{4.09011926, 2.20971038}, {4.74608133, 1.9335932}, {5.02469918, 2.00694987}}},
{{{2.79472921, 1.73568666}, {3.36246373, 1.21251209}, {5, 2}}},
{{{1.80814127, 2.41537795}, {2.23475077, 2.05922313}, {3.16529668, 1.98358763}}},
{{{2.16505631, 2.55782454}, {2.40541285, 2.02193091}, {2.99836023, 1.68247638}}},
{{{3, 1.875}, {3.375, 1.54296875}, {3.375, 1.421875}}},
{{{3.375, 1.421875}, {3.3749999999999996, 1.3007812499999998}, {3, 2}}},
{{{3.34, 8.98}, {2.83363281, 9.4265625}, {2.83796875, 9.363125}}},
{{{2.83796875, 9.363125}, {2.84230469, 9.2996875}, {3.17875, 9.1725}}},
{{{2.7279999999999998, 3.024}, {2.5600000000000005, 2.5600000000000005},
{2.1520000000000001, 1.8560000000000001}}},
{{{0.66666666666666652, 1.1481481481481481}, {1.3333333333333326, 1.3333333333333335},
{2.6666666666666665, 2.1851851851851851}}},
{{{2.728, 3.024}, {2.56, 2.56}, {2.152, 1.856}}},
{{{0.666666667, 1.14814815}, {1.33333333, 1.33333333}, {2.66666667, 2.18518519}}},
{{{0.875, 1.5}, {1.03125, 1.11022302e-16}, {1, 0}}},
{{{0.875, 0.859375}, {1.6875, 0.73046875}, {2.5, 0.625}}},
{{{1.64451042, 0.0942001592}, {1.53635465, 0.00152863961}, {1, 0}}},
{{{1.27672209, 0.15}, {1.32143477, 9.25185854e-17}, {1, 0}}},
{{{0, 0}, {0.51851851851851849, 1.0185185185185186}, {1.2592592592592591, 1.9259259259259258}}},
{{{1.2592592592592593, 1.9259259259259265}, {0.51851851851851893, 1.0185185185185195}, {0, 0}}},
{{{1.93281168, 2.58856757}, {2.38543691, 2.7096125}, {2.51967352, 2.34531784}}},
{{{2.51967352, 2.34531784}, {2.65263731, 2.00639194}, {3.1212119, 1.98608967}}},
{{{2.09544533, 2.51981963}, {2.33331524, 2.25252128}, {2.92003302, 2.39442311}}},
{{{0.924337655, 1.94072717}, {1.25185043, 1.52836494}, {1.71793901, 1.06149951}}},
{{{0.940798831, 1.67439357}, {1.25988251, 1.39778567}, {1.71791672, 1.06650313}}},
{{{0.924337655, 1.94072717}, {1.39158994, 1.32418496}, {2.14967426, 0.687365435}}},
{{{0.940798831, 1.67439357}, {1.48941875, 1.16280321}, {2.47884711, 0.60465921}}},
{{{1.7465749139282332, 1.9930452039527999}, {1.8320006564080331, 1.859481345189089},
{1.8731035127758437, 1.6344055934266613}}},
{{{1.8731035127758437, 1.6344055934266613}, {1.89928170345231, 1.5006405518943067},
{1.9223833226085514, 1.3495796165215643}}},
{{{1.74657491, 1.9930452}, {1.87407679, 1.76762853}, {1.92238332, 1.34957962}}},
{{{0.60797907, 1.68776977}, {1.0447864, 1.50810914}, {1.87464474, 1.63655092}}},
{{{1.87464474, 1.63655092}, {2.70450308, 1.76499271}, {4, 3}}},
{{{1.2071879545809394, 0.82163474041730045}, {1.1534203513372994, 0.52790870069930229},
{1.0880000000000001, 0.29599999999999982}}}, //t=0.63155333662549329,0.80000000000000004
{{{0.33333333333333326, 0.81481481481481488}, {0.63395173631977997, 0.68744136726313931},
{1.205684411948591, 0.81344322326274499}}},
{{{0.33333333333333326, 0.81481481481481488}, {0.63396444791444551, 0.68743368362444768},
{1.205732763658403, 0.81345617746834109}}}, //t=0.33333333333333331, 0.63396444791444551
{{{1.205684411948591, 0.81344322326274499}, {1.2057085875611198, 0.81344969999329253},
{1.205732763658403, 0.81345617746834109}}},
{{{1.20718795, 0.82163474}, {1.15342035, 0.527908701}, {1.088, 0.296}}},
{{{1.20568441, 0.813443223}, {1.20570859, 0.8134497}, {1.20573276, 0.813456177}}},
{{{41.5072916, 87.1234036}, {28.2747836, 80.9545395}, {23.5780771, 69.3344126}}},
{{{72.9633878, 95.6593007}, {42.7738746, 88.4730382}, {31.1932785, 80.2458029}}},
{{{31.1663962, 54.7302484}, {31.1662882, 54.7301074}, {31.1663969, 54.7302485}}},
{{{26.0404936, 45.4260361}, {27.7887523, 33.1863051}, {40.8833242, 26.0301855}}},
{{{29.9404074, 49.1672596}, {44.3131071, 45.3915253}, {58.1067559, 59.5061814}}},
{{{72.6510251, 64.2972928}, {53.6989659, 60.1862397}, {35.2053722, 44.8391126}}},
{{{52.14807018377202, 65.012420045148644}, {44.778669050208237, 66.315562705604378},
{51.619118408823567, 63.787827046262684}}},
{{{30.004993234763383, 93.921296668202288}, {53.384822003076991, 60.732180341802753},
{58.652998934338584, 43.111073088306185}}},
{{{80.897794748143198, 49.236332042718459}, {81.082078218891212, 64.066749904488631},
{69.972305057149981, 72.968595519850993}}},
{{{72.503745601281395, 32.952320736577882}, {88.030880716061645, 38.137194847810164},
{73.193774825517906, 67.773492479591397}}},
{{{67.426548091427676, 37.993772624988935}, {51.129513170665035, 57.542281234563646},
{44.594748190899189, 65.644267382683879}}},
{{{61.336508189019057, 82.693132843213675}, {54.825078921449354, 71.663932799212432},
{47.727444217558926, 61.4049645128392}}},
{{{67.4265481, 37.9937726}, {51.1295132, 57.5422812}, {44.5947482, 65.6442674}}},
{{{61.3365082, 82.6931328}, {54.8250789, 71.6639328}, {47.7274442, 61.4049645}}},
{{{53.774852327053594, 53.318060789841951}, {45.787877803416805, 51.393492026284981},
{46.703936967162392, 53.06860709822206}}},
{{{46.703936967162392, 53.06860709822206}, {47.619996130907957, 54.74372217015916},
{53.020051653535361, 48.633140968832024}}},
{{{50.934805397717923, 51.52391952648901}, {56.803308902971423, 44.246234610627596},
{69.776888596721406, 40.166645096692555}}},
{{{50.230212796400401, 38.386469101526998}, {49.855620812184917, 38.818990392153609},
{56.356567496227363, 47.229909093319407}}},
{{{36.148792695174222, 70.336952793070424}, {36.141613037691357, 70.711654739870085},
{36.154708826402597, 71.088492662905836}}},
{{{35.216235592661825, 70.580199617313212}, {36.244476835123969, 71.010897787304074},
{37.230244263238326, 71.423156953613102}}},
// this pair is nearly coincident, and causes the quartic code to produce bad
// data. Mathematica doesn't think they touch. Graphically, I can't tell.
// it may not be so bad to pretend that they don't touch, if I can detect that
{{{369.848602, 145.680267}, {382.360413, 121.298294}, {406.207703, 121.298294}}},
{{{369.850525, 145.675964}, {382.362915, 121.29287}, {406.211273, 121.29287}}},
{{{33.567436351153468, 62.336347586395924}, {35.200980274619084, 65.038561460144479},
{36.479571811084995, 67.632178905412445}}},
{{{41.349524945572696, 67.886658677862641}, {39.125562529359087, 67.429772735149214},
{35.600314083992416, 66.705372160552685}}},
{{{67.25299631583178, 21.109080184767524}, {43.617595267398613, 33.658034168577529},
{33.38371819435676, 44.214192553988745}}},
{{{40.476838859398541, 39.543209911285999}, {36.701186108431131, 34.8817994016458},
{30.102144288878023, 26.739063172945315}}},
{{{25.367434474345036, 50.4712103169743}, {17.865013304933097, 37.356741010559439},
{16.818988838905465, 37.682915484123129}}},
{{{16.818988838905465, 37.682915484123129}, {15.772964372877833, 38.009089957686811},
{20.624104547604965, 41.825131596683121}}},
{{{26.440225044088567, 79.695009812848298}, {26.085525979582247, 83.717928354134784},
{27.075079976297072, 84.820633667838905}}},
{{{27.075079976297072, 84.820633667838905}, {28.276546859574015, 85.988574184029034},
{25.649263209500006, 87.166762066617025}}},
{{{34.879150914024962, 83.862726601601125}, {35.095810134304429, 83.693473210169543},
{35.359284111931586, 83.488069234177502}}},
{{{54.503204203015471, 76.094098492518242}, {51.366889541918894, 71.609856061299155},
{46.53086955445437, 69.949863036494207}}},
{{{0, 0}, {1, 0}, {0, 3}}},
{{{1, 0}, {0, 1}, {1, 1}}},
{{{369.961151, 137.980698}, {383.970093, 121.298294}, {406.213287, 121.298294}}},
{{{353.2948, 194.351074}, {353.2948, 173.767563}, {364.167572, 160.819855}}},
{{{360.416077, 166.795715}, {370.126831, 147.872162}, {388.635406, 147.872162}}},
{{{406.236359, 121.254936}, {409.445679, 121.254936}, {412.975952, 121.789818}}},
{{{406.235992, 121.254936}, {425.705902, 121.254936}, {439.71994, 137.087616}}},
{{{369.8543701171875, 145.66734313964844}, {382.36788940429688, 121.28203582763672},
{406.21844482421875, 121.28203582763672}}},
{{{369.96469116210938, 137.96672058105469}, {383.97555541992188, 121.28203582763672},
{406.2218017578125, 121.28203582763672}}},
{{{369.962311, 137.976044}, {383.971893, 121.29287}, {406.216125, 121.29287}}},
{{{400.121704, 149.468719}, {391.949493, 161.037186}, {391.949493, 181.202423}}},
{{{391.946747, 181.839218}, {391.946747, 155.62442}, {406.115479, 138.855438}}},
{{{360.048828125, 229.2578125}, {360.048828125, 224.4140625}, {362.607421875, 221.3671875}}},
{{{362.607421875, 221.3671875}, {365.166015625, 218.3203125}, {369.228515625, 218.3203125}}},
{{{8, 8}, {10, 10}, {8, -10}}},
{{{8, 8}, {12, 12}, {14, 4}}},
{{{8, 8}, {9, 9}, {10, 8}}}
};
const size_t testSetCount = SK_ARRAY_COUNT(testSet);
static void oneOffTest1(skiatest::Reporter* reporter, size_t outer, size_t inner) {
const SkDQuad& quad1 = testSet[outer];
SkASSERT(ValidQuad(quad1));
const SkDQuad& quad2 = testSet[inner];
SkASSERT(ValidQuad(quad2));
SkIntersections intersections2;
intersections2.intersect(quad1, quad2);
for (int pt = 0; pt < intersections2.used(); ++pt) {
double tt1 = intersections2[0][pt];
SkDPoint xy1 = quad1.ptAtT(tt1);
double tt2 = intersections2[1][pt];
SkDPoint xy2 = quad2.ptAtT(tt2);
if (!xy1.approximatelyEqual(xy2)) {
SkDebugf("%s [%d,%d] x!= t1=%g (%g,%g) t2=%g (%g,%g)\n",
__FUNCTION__, static_cast<int>(outer), static_cast<int>(inner),
tt1, xy1.fX, xy1.fY, tt2, xy2.fX, xy2.fY);
REPORTER_ASSERT(reporter, 0);
}
#if ONE_OFF_DEBUG
SkDebugf("%s [%d][%d] t1=%1.9g (%1.9g, %1.9g) t2=%1.9g\n", __FUNCTION__,
outer, inner, tt1, xy1.fX, xy1.fY, tt2);
#endif
}
}
DEF_TEST(PathOpsQuadIntersectionOneOff, reporter) {
oneOffTest1(reporter, 0, 1);
}
static void oneOffTests(skiatest::Reporter* reporter) {
for (size_t outer = 0; outer < testSetCount - 1; ++outer) {
for (size_t inner = outer + 1; inner < testSetCount; ++inner) {
oneOffTest1(reporter, outer, inner);
}
}
}
static const SkDQuad coincidentTestSet[] = {
#if 0
{{{97.9337615966796875,100}, {88,112.94264984130859375}, {88,130}}},
{{{88,130}, {88,124.80951690673828125}, {88.91983795166015625,120}}},
#endif
{{{369.850525, 145.675964}, {382.362915, 121.29287}, {406.211273, 121.29287}}},
{{{369.850525, 145.675964}, {382.362915, 121.29287}, {406.211273, 121.29287}}},
{{{8, 8}, {10, 10}, {8, -10}}},
{{{8, -10}, {10, 10}, {8, 8}}},
};
static const int coincidentTestSetCount = (int) SK_ARRAY_COUNT(coincidentTestSet);
static void coincidentTestOne(skiatest::Reporter* reporter, int test1, int test2) {
const SkDQuad& quad1 = coincidentTestSet[test1];
SkASSERT(ValidQuad(quad1));
const SkDQuad& quad2 = coincidentTestSet[test2];
SkASSERT(ValidQuad(quad2));
SkIntersections intersections2;
intersections2.intersect(quad1, quad2);
REPORTER_ASSERT(reporter, intersections2.coincidentUsed() == 2);
REPORTER_ASSERT(reporter, intersections2.used() == 2);
for (int pt = 0; pt < intersections2.coincidentUsed(); ++pt) {
double tt1 = intersections2[0][pt];
double tt2 = intersections2[1][pt];
SkDPoint pt1 = quad1.ptAtT(tt1);
SkDPoint pt2 = quad2.ptAtT(tt2);
REPORTER_ASSERT(reporter, pt1.approximatelyEqual(pt2));
}
}
static void coincidentTest(skiatest::Reporter* reporter) {
for (int testIndex = 0; testIndex < coincidentTestSetCount - 1; testIndex += 2) {
coincidentTestOne(reporter, testIndex, testIndex + 1);
}
}
DEF_TEST(PathOpsQuadIntersectionCoincidenceOneOff, reporter) {
coincidentTestOne(reporter, 0, 1);
}
static int floatSign(double x) {
return x < 0 ? -1 : x > 0 ? 1 : 0;
}
static const SkDQuad pointFinderTestSet[] = {
//>=0.633974464 0.633974846 <=
{{{1.2071879545809394, 0.82163474041730045}, {1.1534203513372994, 0.52790870069930229},
{1.0880000000000001, 0.29599999999999982}}}, //t=0.63155333662549329, 0.80000000000000004
{{{1.2071879545809394, 0.82163474041730045}, {1.2065040319428038, 0.81766753259119995},
{1.2058123269101506, 0.81370135061854221}}}, //t=0.63155333662549329, 0.6339049773632347
{{{1.2058123269101506, 0.81370135061854221}, {1.152376363978022, 0.5244097415381026},
{1.0880000000000001, 0.29599999999999982}}}, //t=0.6339049773632347, 0.80000000000000004
//>=0.633974083 0.633975227 <=
{{{0.33333333333333326, 0.81481481481481488}, {0.63395173631977997, 0.68744136726313931},
{1.205684411948591, 0.81344322326274499}}}, //t=0.33333333333333331, 0.63395173631977986
{{{0.33333333333333326, 0.81481481481481488}, {0.63396444791444551, 0.68743368362444768},
{1.205732763658403, 0.81345617746834109}}}, //t=0.33333333333333331, 0.63396444791444551
{{{1.205684411948591, 0.81344322326274499}, {1.2057085875611198, 0.81344969999329253},
{1.205732763658403, 0.81345617746834109}}}, //t=0.63395173631977986, 0.63396444791444551
{{{1.205732763658403, 0.81345617746834109}, {1.267928895828891, 0.83008534558465619},
{1.3333333333333333, 0.85185185185185175}}}, //t=0.63396444791444551, 0.66666666666666663
};
static void pointFinder(const SkDQuad& q1, const SkDQuad& q2) {
for (int index = 0; index < 3; ++index) {
double t = q1.nearestT(q2[index]);
SkDPoint onQuad = q1.ptAtT(t);
SkDebugf("%s t=%1.9g (%1.9g,%1.9g) dist=%1.9g\n", __FUNCTION__, t, onQuad.fX, onQuad.fY,
onQuad.distance(q2[index]));
double left[3];
left[0] = ((const SkDLine&) q1[0]).isLeft(q2[index]);
left[1] = ((const SkDLine&) q1[1]).isLeft(q2[index]);
SkDLine diag = {{q1[0], q1[2]}};
left[2] = diag.isLeft(q2[index]);
SkDebugf("%s left=(%d, %d, %d) inHull=%s\n", __FUNCTION__, floatSign(left[0]),
floatSign(left[1]), floatSign(left[2]),
q1.pointInHull(q2[index]) ? "true" : "false");
}
SkDebugf("\n");
}
static void hullIntersect(const SkDQuad& q1, const SkDQuad& q2) {
SkDebugf("%s", __FUNCTION__);
SkIntersections ts;
for (int i1 = 0; i1 < 3; ++i1) {
SkDLine l1 = {{q1[i1], q1[(i1 + 1) % 3]}};
for (int i2 = 0; i2 < 3; ++i2) {
SkDLine l2 = {{q2[i2], q2[(i2 + 1) % 3]}};
if (ts.intersect(l1, l2)) {
SkDebugf(" [%d,%d]", i1, i2);
}
}
}
SkDebugf("\n");
}
static void QuadraticIntersection_PointFinder() {
pointFinder(pointFinderTestSet[0], pointFinderTestSet[4]);
pointFinder(pointFinderTestSet[4], pointFinderTestSet[0]);
pointFinder(pointFinderTestSet[0], pointFinderTestSet[6]);
pointFinder(pointFinderTestSet[6], pointFinderTestSet[0]);
hullIntersect(pointFinderTestSet[0], pointFinderTestSet[4]);
hullIntersect(pointFinderTestSet[0], pointFinderTestSet[6]);
}
static void intersectionFinder(int test1, int test2) {
const SkDQuad& quad1 = testSet[test1];
const SkDQuad& quad2 = testSet[test2];
double t1Seed = 0.5;
double t2Seed = 0.8;
double t1Step = 0.1;
double t2Step = 0.1;
SkDPoint t1[3], t2[3];
bool toggle = true;
do {
t1[0] = quad1.ptAtT(t1Seed - t1Step);
t1[1] = quad1.ptAtT(t1Seed);
t1[2] = quad1.ptAtT(t1Seed + t1Step);
t2[0] = quad2.ptAtT(t2Seed - t2Step);
t2[1] = quad2.ptAtT(t2Seed);
t2[2] = quad2.ptAtT(t2Seed + t2Step);
double dist[3][3];
dist[1][1] = t1[1].distance(t2[1]);
int best_i = 1, best_j = 1;
for (int i = 0; i < 3; ++i) {
for (int j = 0; j < 3; ++j) {
if (i == 1 && j == 1) {
continue;
}
dist[i][j] = t1[i].distance(t2[j]);
if (dist[best_i][best_j] > dist[i][j]) {
best_i = i;
best_j = j;
}
}
}
if (best_i == 0) {
t1Seed -= t1Step;
} else if (best_i == 2) {
t1Seed += t1Step;
}
if (best_j == 0) {
t2Seed -= t2Step;
} else if (best_j == 2) {
t2Seed += t2Step;
}
if (best_i == 1 && best_j == 1) {
if ((toggle ^= true)) {
t1Step /= 2;
} else {
t2Step /= 2;
}
}
} while (!t1[1].approximatelyEqual(t2[1]));
t1Step = t2Step = 0.1;
double t10 = t1Seed - t1Step * 2;
double t12 = t1Seed + t1Step * 2;
double t20 = t2Seed - t2Step * 2;
double t22 = t2Seed + t2Step * 2;
SkDPoint test;
while (!approximately_zero(t1Step)) {
test = quad1.ptAtT(t10);
t10 += t1[1].approximatelyEqual(test) ? -t1Step : t1Step;
t1Step /= 2;
}
t1Step = 0.1;
while (!approximately_zero(t1Step)) {
test = quad1.ptAtT(t12);
t12 -= t1[1].approximatelyEqual(test) ? -t1Step : t1Step;
t1Step /= 2;
}
while (!approximately_zero(t2Step)) {
test = quad2.ptAtT(t20);
t20 += t2[1].approximatelyEqual(test) ? -t2Step : t2Step;
t2Step /= 2;
}
t2Step = 0.1;
while (!approximately_zero(t2Step)) {
test = quad2.ptAtT(t22);
t22 -= t2[1].approximatelyEqual(test) ? -t2Step : t2Step;
t2Step /= 2;
}
#if ONE_OFF_DEBUG
SkDebugf("%s t1=(%1.9g<%1.9g<%1.9g) t2=(%1.9g<%1.9g<%1.9g)\n", __FUNCTION__,
t10, t1Seed, t12, t20, t2Seed, t22);
SkDPoint p10 = quad1.ptAtT(t10);
SkDPoint p1Seed = quad1.ptAtT(t1Seed);
SkDPoint p12 = quad1.ptAtT(t12);
SkDebugf("%s p1=(%1.9g,%1.9g)<(%1.9g,%1.9g)<(%1.9g,%1.9g)\n", __FUNCTION__,
p10.fX, p10.fY, p1Seed.fX, p1Seed.fY, p12.fX, p12.fY);
SkDPoint p20 = quad2.ptAtT(t20);
SkDPoint p2Seed = quad2.ptAtT(t2Seed);
SkDPoint p22 = quad2.ptAtT(t22);
SkDebugf("%s p2=(%1.9g,%1.9g)<(%1.9g,%1.9g)<(%1.9g,%1.9g)\n", __FUNCTION__,
p20.fX, p20.fY, p2Seed.fX, p2Seed.fY, p22.fX, p22.fY);
#endif
}
static void QuadraticIntersection_IntersectionFinder() {
intersectionFinder(0, 1);
}
DEF_TEST(PathOpsQuadIntersection, reporter) {
oneOffTests(reporter);
coincidentTest(reporter);
standardTestCases(reporter);
if (false) QuadraticIntersection_IntersectionFinder();
if (false) QuadraticIntersection_PointFinder();
}
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