skia2/experimental/Intersection/EdgeWalkerPolygons_Test.cpp

#include "EdgeWalker_Test.h"
#include "Intersection_Tests.h"
#include "SkBitmap.h"

static SkBitmap bitmap;

static void testSimplifyTriangle() {
    SkPath path, out;
    path.setFillType(SkPath::kWinding_FillType);
    path.moveTo(10,10); // triangle      |\      .
    path.lineTo(10,30); //               |_\     .
    path.lineTo(20,30);
    path.close();
    path.moveTo(20,10); // triangle        /|
    path.lineTo(10,30); //                /_|
    path.lineTo(20,30);
    path.close();
    testSimplify(path, true, out, bitmap); // expect |\/|
                                   //        |__|         
}

static void testSimplifyTriangle3() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(3, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle4() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(2, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle5() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 1);
    path.lineTo(2, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle6() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(3, 1);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle7() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 1);
    path.lineTo(0, 2);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle8() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 1);
    path.lineTo(1, 2);
    path.lineTo(1, 3);
    path.lineTo(0, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle9() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(1, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 1);
    path.lineTo(2, 1);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle10() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(1, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(2, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle11() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 2);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(2, 1);
    path.lineTo(2, 2);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle12() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(1, 2);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(2, 0);
    path.lineTo(0, 3);
    path.lineTo(1, 1);
    path.lineTo(2, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle13() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 3);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(3, 0);
    path.lineTo(0, 3);
    path.lineTo(1, 1);
    path.lineTo(3, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle14() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle15() {
    SkPath path, out;
    path.setFillType(SkPath::kEvenOdd_FillType);
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 2);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(2, 2);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle16() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 2);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 3);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle17() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 2);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 3);
    path.lineTo(0, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}
    
static void testSimplifyTriangle18() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 2);
    path.close();
    path.moveTo(1, 0);
    path.lineTo(0, 1);
    path.lineTo(0, 3);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle19() {
    SkPath path, out;
    path.setFillType(SkPath::kEvenOdd_FillType);
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(3, 2);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 1);
    path.lineTo(2, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle20() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(2, 1);
    path.lineTo(1, 3);
    path.close();
    path.moveTo(2, 0);
    path.lineTo(3, 2);
    path.lineTo(0, 3);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle21() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(1, 2);
    path.close();
    path.moveTo(2, 0);
    path.lineTo(2, 1);
    path.lineTo(0, 3);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyDegenerateTriangle1() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 0);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(0, 0);
    path.lineTo(0, 0);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyDegenerateTriangle2() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 1);
    path.lineTo(2, 2);
    path.close();
    path.moveTo(1, 0);
    path.lineTo(2, 2);
    path.lineTo(3, 3);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyWindingParallelogram() {
    SkPath path, out;
    path.setFillType(SkPath::kWinding_FillType);
    path.moveTo(20,10); // parallelogram  _ 
    path.lineTo(30,30); //               \ \      .
    path.lineTo(40,30); //                \_\     .
    path.lineTo(30,10);
    path.close();
    path.moveTo(20,10); // parallelogram   _
    path.lineTo(10,30); //                / /
    path.lineTo(20,30); //               /_/
    path.lineTo(30,10);
    path.close();
    testSimplify(path, true, out, bitmap); // expect   _
                                   //         / \     .       
}                                  //        /___\    .

static void testSimplifyXorParallelogram() {
    SkPath path, out;
    path.setFillType(SkPath::kEvenOdd_FillType);
    path.moveTo(20,10); // parallelogram  _ 
    path.lineTo(30,30); //               \ \      .
    path.lineTo(40,30); //                \_\     .
    path.lineTo(30,10);
    path.close();
    path.moveTo(20,10); // parallelogram   _
    path.lineTo(10,30); //                / /
    path.lineTo(20,30); //               /_/
    path.lineTo(30,10);
    path.close();
    testSimplify(path, true, out, bitmap); // expect   _
}                                  //         \ /

static void testSimplifyTriangle2() {
    SkPath path, out;
    path.setFillType(SkPath::kWinding_FillType);
    path.moveTo(10,10); // triangle      |\      .
    path.lineTo(10,30); //               |_\     .
    path.lineTo(20,30);
    path.close();
    path.moveTo(10,10); // triangle       _ 
    path.lineTo(20,10); //               \ |
    path.lineTo(20,30); //                \|
    path.close();                  //         _
    testSimplify(path, true, out, bitmap); // expect | |
}                                  //        |_|

#if 0
static void testPathTriangleRendering() {
    SkPath one, two;
    one.moveTo(0, 0);
    one.lineTo(3, 3);
    one.lineTo(0, 3);
    one.lineTo(1, 2);
    one.close();
    for (float x = .1f; x <= 2.9f; x += .1f) {
        SkDebugf("%s x=%g\n", __FUNCTION__, x);
        two.moveTo(0, 0);
        two.lineTo(x, x);
        two.lineTo(3, 3);
        two.lineTo(0, 3);
        two.lineTo(1, 2);
        two.close();
        comparePaths(one, two);
        two.reset();
    }
}
#endif

static void simplify(const char* functionName, const SkPath& path,
        bool fill, SkPath& out) {
    if (false) SkDebugf("%s\n", functionName);
    simplify(path, fill, out);
}

static void testSimplifySkinnyTriangle1() {
    for (int x = 1; x < 255; ++x) {
        SkPath path, out;
        path.moveTo((x * 101) % 10, 0);
        path.lineTo((x * 91) % 10, 1000);
        path.lineTo((x * 71) % 10, 2000);
        path.lineTo((x * 51) % 10, 3000);
        path.close();
        path.moveTo((x * 101) % 20, 0);
        path.lineTo((x * 91) % 20, 1000);
        path.lineTo((x * 71) % 20, 2000);
        path.lineTo((x * 51) % 20, 3000);
        path.close();
        path.moveTo((x * 101) % 30, 0);
        path.lineTo((x * 91) % 30, 1000);
        path.lineTo((x * 71) % 30, 2000);
        path.lineTo((x * 51) % 30, 3000);
        path.close();
        simplify(path, true, out);
    }
}

static void testSimplifySkinnyTriangle2() {
        SkPath path, out;
#if 01
path.moveTo(591.091064, 627.534851);
path.lineTo(541.088135, 560.707642);
path.lineTo(491.085175, 493.880310);
path.lineTo(441.082214, 427.053101);
//path.lineTo(591.091064, 627.534851);
path.close();
#endif
path.moveTo(317.093445, 592.013306);
path.lineTo(366.316162, 542.986572);
path.lineTo(416.051514, 486.978577);
path.lineTo(465.786865, 430.970581);
//path.lineTo(317.093445, 592.013306);
path.close();
#if 0
path.moveTo(289.392517, 517.138489);
path.lineTo(249.886078, 508.598022);
path.lineTo(217.110916, 450.916443);
path.lineTo(196.621033, 394.917633);
//path.lineTo(289.392517, 517.138489);
path.close();
#endif
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle3() {
        SkPath path, out;
        path.moveTo(591, 627.534851);
        path.lineTo(541, 560.707642);
        path.lineTo(491, 493.880310);
        path.lineTo(441, 427.053101);
        path.close();
        path.moveTo(317, 592.013306);
        path.lineTo(366, 542.986572);
        path.lineTo(416, 486.978577);
        path.lineTo(465, 430.970581);
        path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle4() {
        SkPath path, out;
path.moveTo(572.655212, 614.959961);
path.lineTo(524.618896, 549.339600);
path.lineTo(476.582581, 483.719269);
path.lineTo(428.546265, 418.098938);
path.lineTo(572.655212, 614.959961);
path.close();
path.moveTo(312.166382, 583.723083);
path.lineTo(361.047791, 529.824219);
path.lineTo(409.929230, 475.925354);
path.lineTo(458.810669, 422.026520);
path.lineTo(312.166382, 583.723083);
path.close();
path.moveTo(278.742737, 508.065643);
path.lineTo(241.475800, 493.465118);
path.lineTo(210.344177, 437.315125);
path.lineTo(197.019455, 383.794556);
path.lineTo(278.742737, 508.065643);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle5() {
        SkPath path, out;
path.moveTo(554.690613, 602.286072);
path.lineTo(508.590057, 537.906250);
path.lineTo(462.489441, 473.526520);
path.lineTo(416.388855, 409.146729);
path.lineTo(554.690613, 602.286072);
path.close();
path.moveTo(307.216949, 575.189270);
path.lineTo(355.826965, 516.804688);
path.lineTo(403.815918, 464.990753);
path.lineTo(451.804871, 413.176819);
path.lineTo(307.216949, 575.189270);
path.close();
path.moveTo(271.998901, 521.301025);
path.lineTo(234.619705, 499.687683);
path.lineTo(203.059692, 441.332336);
path.lineTo(195.994370, 386.856506);
path.lineTo(271.998901, 521.301025);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle6() {
        SkPath path, out;
path.moveTo(591.091064, 627.534851);
path.lineTo(541.088135, 560.707642);
path.lineTo(491.085175, 493.880310);
path.lineTo(441.082214, 427.053101);
path.lineTo(591.091064, 627.534851);
path.close();
path.moveTo(317.093445, 592.013306);
path.lineTo(366.316162, 542.986572);
path.lineTo(416.051514, 486.978577);
path.lineTo(465.786865, 430.970581);
path.lineTo(317.093445, 592.013306);
path.close();
path.moveTo(289.392517, 517.138489);
path.lineTo(249.886078, 508.598022);
path.lineTo(217.110916, 450.916443);
path.lineTo(196.621033, 394.917633);
path.lineTo(289.392517, 517.138489);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifyTriangle22() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 2);
    path.close();
    path.moveTo(1, 0);
    path.lineTo(0, 2);
    path.lineTo(0, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle23() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 0);
    path.lineTo(0, 0);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(0, 1);
    path.lineTo(1, 2);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifyTriangle24() {
    SkPath path, out;
    path.moveTo(0, 0);
    path.lineTo(0, 0);
    path.lineTo(0, 1);
    path.close();
    path.moveTo(0, 0);
    path.lineTo(1, 0);
    path.lineTo(0, 1);
    path.close();
    testSimplify(path, true, out, bitmap);
}

static void testSimplifySkinnyTriangle7() {
        SkPath path, out;
path.moveTo(487.502319, 550.811279);
path.lineTo(448.826050, 491.720123);
path.lineTo(410.149780, 432.628967);
path.lineTo(371.473572, 373.537781);
path.lineTo(487.502319, 550.811279);
path.close();
path.moveTo(295.817108, 532.655579);
path.lineTo(342.896271, 485.912292);
path.lineTo(389.975433, 439.169006);
path.lineTo(437.054596, 392.425781);
path.lineTo(295.817108, 532.655579);
path.close();
path.moveTo(239.726822, 575.025269);
path.lineTo(204.117569, 521.429688);
path.lineTo(171.275452, 454.110382);
path.lineTo(193.328583, 397.859497);
path.lineTo(239.726822, 575.025269);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle8() {
        SkPath path, out;
path.moveTo(441.943115, 511.678040);
path.lineTo(408.487549, 456.880920);
path.lineTo(375.031952, 402.083801);
path.lineTo(341.576385, 347.286682);
path.lineTo(441.943115, 511.678040);
path.close();
path.moveTo(297.548492, 557.246704);
path.lineTo(350.768494, 507.627014);
path.lineTo(403.988525, 458.007385);
path.lineTo(457.208527, 408.387695);
path.lineTo(297.548492, 557.246704);
path.close();
path.moveTo(209.857895, 615.802979);
path.lineTo(178.249481, 534.230347);
path.lineTo(144.905640, 460.056824);
path.lineTo(192.953125, 404.972900);
path.lineTo(209.857895, 615.802979);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle9() {
        SkPath path, out;
path.moveTo(439.867065, 528.291931);
path.lineTo(405.413025, 469.107178);
path.lineTo(370.958954, 409.922363);
path.lineTo(336.504883, 350.737610);
path.lineTo(439.867065, 528.291931);
path.close();
path.moveTo(298.922455, 573.251953);
path.lineTo(356.360962, 521.905090);
path.lineTo(413.799438, 470.558228);
path.lineTo(471.237915, 419.211365);
path.lineTo(298.922455, 573.251953);
path.close();
path.moveTo(187.200775, 643.035156);
path.lineTo(159.713165, 540.993774);
path.lineTo(126.257164, 462.198517);
path.lineTo(193.534012, 409.266235);
path.lineTo(187.200775, 643.035156);
path.close();
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle10() {
        SkPath path, out;
#if 0
path.moveTo(99.270325, 239.365234);
path.lineTo(105.967056, 173.361206);
path.lineTo(148.821381, 141.309891);
path.lineTo(159.101013, 189.235138);
path.lineTo(99.270325, 239.365234);
path.close();
#endif
path.moveTo(213.673737, 413.292938);
path.lineTo(225.200134, 343.616821);
path.lineTo(236.726532, 273.940704);
path.lineTo(219.386414, 231.373322);
path.lineTo(213.673737, 413.292938);
path.close();
path.moveTo(43.485352, 308.984497);
path.lineTo(122.610657, 305.950134);
path.lineTo(201.735962, 302.915802);
path.lineTo(280.861267, 299.881470);
path.lineTo(43.485352, 308.984497);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle11() {
        SkPath path, out;
path.moveTo(-177.878387, 265.368988);
path.lineTo(-254.415771, 303.709961);
path.lineTo(-317.465363, 271.325562);
path.lineTo(-374.520386, 207.507660);
path.lineTo(-177.878387, 265.368988);
path.close();
path.moveTo(-63.582489, -3.679123);
path.lineTo(-134.496841, 26.434566);
path.lineTo(-205.411209, 56.548256);
path.lineTo(-276.325562, 86.661942);
path.lineTo(-63.582489, -3.679123);
path.close();
path.moveTo(-57.078423, 162.633453);
path.lineTo(-95.963928, 106.261139);
path.lineTo(-134.849457, 49.888824);
path.lineTo(-173.734955, -6.483480);
path.lineTo(-57.078423, 162.633453);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle12() {
        SkPath path, out;
path.moveTo(98.666489, -94.295059);
path.lineTo(156.584320, -61.939133);
path.lineTo(174.672974, -12.343765);
path.lineTo(158.622345, 52.028267);
path.lineTo(98.666489, -94.295059);
path.close();
path.moveTo(-133.225616, -48.622055);
path.lineTo(-73.855499, -10.375397);
path.lineTo(-14.485367, 27.871277);
path.lineTo(44.884750, 66.117935);
path.lineTo(-133.225616, -48.622055);
path.close();
path.moveTo( 9.030045, -163.413132);
path.lineTo(-19.605331, -89.588760);
path.lineTo(-48.240707, -15.764404);
path.lineTo(-76.876053, 58.059944);
path.lineTo( 9.030045, -163.413132);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void testSimplifySkinnyTriangle13() {
        SkPath path, out;
path.moveTo(340.41568, -170.97171);
path.lineTo(418.846893, -142.428329);
path.lineTo(497.278107, -113.884933);
path.lineTo(449.18222, -45.6723022);
path.lineTo(340.41568, -170.97171);
path.close();
path.moveTo(326.610535, 34.0393639);
path.lineTo(371.334595, -14.9620667);
path.lineTo(416.058624, -63.9634857);
path.lineTo(460.782654, -112.96492);
path.lineTo(326.610535, 34.0393639);
path.close();
    simplify(__FUNCTION__, path, true, out);
}

static void (*simplifyTests[])() = {
    testSimplifySkinnyTriangle13,
    testSimplifySkinnyTriangle12,
    testSimplifySkinnyTriangle11,
    testSimplifySkinnyTriangle10,
    testSimplifySkinnyTriangle9,
    testSimplifySkinnyTriangle8,
    testSimplifySkinnyTriangle7,
    testSimplifySkinnyTriangle6,
    testSimplifySkinnyTriangle5,
    testSimplifySkinnyTriangle4,
    testSimplifySkinnyTriangle3,
    testSimplifySkinnyTriangle2,
    testSimplifySkinnyTriangle1,
    testSimplifyTriangle24,
    testSimplifyTriangle23,
    testSimplifyTriangle22,
    testSimplifyDegenerateTriangle2,
    testSimplifyDegenerateTriangle1,
    testSimplifyTriangle21,
    testSimplifyTriangle20,
    testSimplifyTriangle19,
    testSimplifyTriangle18,
    testSimplifyTriangle17,
    testSimplifyTriangle16,
    testSimplifyTriangle15,
    testSimplifyTriangle14,
    testSimplifyTriangle13,
    testSimplifyTriangle12,
    testSimplifyTriangle11,
    testSimplifyTriangle10,
    testSimplifyTriangle7,
    testSimplifyTriangle9,
    testSimplifyTriangle8,
    testSimplifyTriangle6,
    testSimplifyTriangle5,
    testSimplifyTriangle4,
    testSimplifyTriangle3,
    testSimplifyTriangle,
    testSimplifyTriangle2,
    testSimplifyWindingParallelogram,
    testSimplifyXorParallelogram,
//    testPathTriangleRendering,
};

static size_t simplifyTestsCount = sizeof(simplifyTests) / sizeof(simplifyTests[0]);

static void (*firstTest)() = testSimplifySkinnyTriangle12;

void SimplifyPolygonPaths_Test() {
    size_t index = 0;
    if (firstTest) {
        while (index < simplifyTestsCount && simplifyTests[index] != firstTest) {
            ++index;
        }
    }
    bool firstTestComplete = false;
    for ( ; index < simplifyTestsCount; ++index) {
        (*simplifyTests[index])();
        if (simplifyTests[index] == testSimplifySkinnyTriangle2) {
            if (false) SkDebugf("%s last fast skinny test\n", __FUNCTION__);
        }
        firstTestComplete = true;
    }
}