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skia2/tests/GradientTest.cpp
Brian Osman 3695bdb587 Refactor SkMatrixProvider slightly 
There was only one virtual method, so switch that to a bool stored in
the base class. The derived types exist as hints for the reader, and an
easy way to adjust how the new localToDevice is constructed.

With this change, we don't need SkSimpleMatrixProvider. SkMatrixProvider
is concrete, so we can use it directly. SkOverrideDeviceMatrixProvider
no longer needs the original provider for anything, so remove that
parameter. It now exists solely to inhibit the hitsPixelCenters flag.

Fix a few spots (SkParticleBinding, some sites in SkRuntimeEffect) where
we used SkSimpleMatrixProvider, even though the local coordinates being
passed did not obey the hits-pixel-centers constraints.

Most importantly, document how localToDeviceHitsPixelCenters works.

Change-Id: Ibe9060bac0822d0edf52a507d390bd198d8e6dbd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/482176
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2021-12-09 20:10:58 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkShader.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "include/private/SkTemplates.h"
#include "src/core/SkMatrixProvider.h"
#include "src/core/SkTLazy.h"
#include "src/gpu/GrColorInfo.h"
#include "src/shaders/SkColorShader.h"
#include "tests/Test.h"
// https://code.google.com/p/chromium/issues/detail?id=448299
// Giant (inverse) matrix causes overflow when converting/computing using 32.32
// Before the fix, we would assert (and then crash).
static void test_big_grad(skiatest::Reporter* reporter) {
const SkColor colors[] = { SK_ColorRED, SK_ColorBLUE };
const SkPoint pts[] = {{ 15, 14.7112684f }, { 0.709064007f, 12.6108112f }};
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp));
SkBitmap bm;
bm.allocN32Pixels(2000, 1);
SkCanvas c(bm);
const SkScalar affine[] = {
1.06608627e-06f, 4.26434525e-07f, 6.2855f, 2.6611f, 273.4393f, 244.0046f
};
SkMatrix matrix;
matrix.setAffine(affine);
c.concat(matrix);
c.drawPaint(paint);
}
struct GradRec {
int fColorCount;
const SkColor* fColors;
const SkScalar* fPos;
const SkPoint* fPoint; // 2
const SkScalar* fRadius; // 2
SkTileMode fTileMode;
void gradCheck(skiatest::Reporter* reporter, const sk_sp<SkShader>& shader,
SkShader::GradientInfo* info,
SkShader::GradientType gt) const {
SkAutoTMalloc<SkColor> colorStorage(fColorCount);
SkAutoTMalloc<SkScalar> posStorage(fColorCount);
info->fColorCount = fColorCount;
info->fColors = colorStorage;
info->fColorOffsets = posStorage.get();
REPORTER_ASSERT(reporter, shader->asAGradient(info) == gt);
REPORTER_ASSERT(reporter, info->fColorCount == fColorCount);
REPORTER_ASSERT(reporter,
!memcmp(info->fColors, fColors, fColorCount * sizeof(SkColor)));
REPORTER_ASSERT(reporter,
!memcmp(info->fColorOffsets, fPos, fColorCount * sizeof(SkScalar)));
REPORTER_ASSERT(reporter, fTileMode == (SkTileMode)info->fTileMode);
}
};
static void none_gradproc(skiatest::Reporter* reporter, const GradRec&, const GradRec&) {
sk_sp<SkShader> s(SkShaders::Empty());
REPORTER_ASSERT(reporter, SkShader::kNone_GradientType == s->asAGradient(nullptr));
}
static void color_gradproc(skiatest::Reporter* reporter, const GradRec& rec, const GradRec&) {
sk_sp<SkShader> s(new SkColorShader(rec.fColors[0]));
REPORTER_ASSERT(reporter, SkShader::kColor_GradientType == s->asAGradient(nullptr));
SkShader::GradientInfo info;
info.fColors = nullptr;
info.fColorCount = 0;
s->asAGradient(&info);
REPORTER_ASSERT(reporter, 1 == info.fColorCount);
}
static void linear_gradproc(skiatest::Reporter* reporter, const GradRec& buildRec,
const GradRec& checkRec) {
sk_sp<SkShader> s(SkGradientShader::MakeLinear(buildRec.fPoint, buildRec.fColors, buildRec.fPos,
buildRec.fColorCount, buildRec.fTileMode));
SkShader::GradientInfo info;
checkRec.gradCheck(reporter, s, &info, SkShader::kLinear_GradientType);
REPORTER_ASSERT(reporter, !memcmp(info.fPoint, checkRec.fPoint, 2 * sizeof(SkPoint)));
}
static void radial_gradproc(skiatest::Reporter* reporter, const GradRec& buildRec,
const GradRec& checkRec) {
sk_sp<SkShader> s(SkGradientShader::MakeRadial(buildRec.fPoint[0], buildRec.fRadius[0],
buildRec.fColors, buildRec.fPos,
buildRec.fColorCount, buildRec.fTileMode));
SkShader::GradientInfo info;
checkRec.gradCheck(reporter, s, &info, SkShader::kRadial_GradientType);
REPORTER_ASSERT(reporter, info.fPoint[0] == checkRec.fPoint[0]);
REPORTER_ASSERT(reporter, info.fRadius[0] == checkRec.fRadius[0]);
}
static void sweep_gradproc(skiatest::Reporter* reporter, const GradRec& buildRec,
const GradRec& checkRec) {
sk_sp<SkShader> s(SkGradientShader::MakeSweep(buildRec.fPoint[0].fX, buildRec.fPoint[0].fY,
buildRec.fColors, buildRec.fPos,
buildRec.fColorCount));
SkShader::GradientInfo info;
checkRec.gradCheck(reporter, s, &info, SkShader::kSweep_GradientType);
REPORTER_ASSERT(reporter, info.fPoint[0] == checkRec.fPoint[0]);
}
static void conical_gradproc(skiatest::Reporter* reporter, const GradRec& buildRec,
const GradRec& checkRec) {
sk_sp<SkShader> s(SkGradientShader::MakeTwoPointConical(buildRec.fPoint[0],
buildRec.fRadius[0],
buildRec.fPoint[1],
buildRec.fRadius[1],
buildRec.fColors,
buildRec.fPos,
buildRec.fColorCount,
buildRec.fTileMode));
SkShader::GradientInfo info;
checkRec.gradCheck(reporter, s, &info, SkShader::kConical_GradientType);
REPORTER_ASSERT(reporter, !memcmp(info.fPoint, checkRec.fPoint, 2 * sizeof(SkPoint)));
REPORTER_ASSERT(reporter, !memcmp(info.fRadius, checkRec.fRadius, 2 * sizeof(SkScalar)));
}
// Ensure that repeated color gradients behave like drawing a single color
static void TestConstantGradient(skiatest::Reporter*) {
const SkPoint pts[] = {
{ 0, 0 },
{ SkIntToScalar(10), 0 }
};
SkColor colors[] = { SK_ColorBLUE, SK_ColorBLUE };
const SkScalar pos[] = { 0, SK_Scalar1 };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 2, SkTileMode::kClamp));
SkBitmap outBitmap;
outBitmap.allocN32Pixels(10, 1);
SkCanvas canvas(outBitmap);
canvas.drawPaint(paint);
for (int i = 0; i < 10; i++) {
// The following is commented out because it currently fails
// Related bug: https://code.google.com/p/skia/issues/detail?id=1098
// REPORTER_ASSERT(reporter, SK_ColorBLUE == outBitmap.getColor(i, 0));
}
}
typedef void (*GradProc)(skiatest::Reporter* reporter, const GradRec&, const GradRec&);
static void TestGradientShaders(skiatest::Reporter* reporter) {
static const SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
static const SkPoint gPts[] = {
{ 0, 0 },
{ SkIntToScalar(10), SkIntToScalar(20) }
};
static const SkScalar gRad[] = { SkIntToScalar(1), SkIntToScalar(2) };
GradRec rec;
rec.fColorCount = SK_ARRAY_COUNT(gColors);
rec.fColors = gColors;
rec.fPos = gPos;
rec.fPoint = gPts;
rec.fRadius = gRad;
rec.fTileMode = SkTileMode::kClamp;
static const GradProc gProcs[] = {
none_gradproc,
color_gradproc,
linear_gradproc,
radial_gradproc,
sweep_gradproc,
conical_gradproc,
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
gProcs[i](reporter, rec, rec);
}
}
static void TestGradientOptimization(skiatest::Reporter* reporter) {
static const struct {
GradProc fProc;
bool fIsClampRestricted;
} gProcInfo[] = {
{ linear_gradproc , false },
{ radial_gradproc , false },
{ sweep_gradproc , true }, // sweep is funky in that it always pretends to be kClamp.
{ conical_gradproc, false },
};
static const SkColor gC_00[] = { 0xff000000, 0xff000000 };
static const SkColor gC_01[] = { 0xff000000, 0xffffffff };
static const SkColor gC_11[] = { 0xffffffff, 0xffffffff };
static const SkColor gC_001[] = { 0xff000000, 0xff000000, 0xffffffff };
static const SkColor gC_011[] = { 0xff000000, 0xffffffff, 0xffffffff };
static const SkColor gC_0011[] = { 0xff000000, 0xff000000, 0xffffffff, 0xffffffff };
static const SkScalar gP_01[] = { 0, 1 };
static const SkScalar gP_001[] = { 0, 0, 1 };
static const SkScalar gP_011[] = { 0, 1, 1 };
static const SkScalar gP_0x1[] = { 0, .5f, 1 };
static const SkScalar gP_0011[] = { 0, 0, 1, 1 };
static const SkPoint gPts[] = { {0, 0}, {1, 1} };
static const SkScalar gRadii[] = { 1, 2 };
static const struct {
const SkColor* fCol;
const SkScalar* fPos;
int fCount;
const SkColor* fExpectedCol;
const SkScalar* fExpectedPos;
int fExpectedCount;
bool fRequiresNonClamp;
} gTests[] = {
{ gC_001, gP_001, 3, gC_01, gP_01, 2, false },
{ gC_001, gP_011, 3, gC_00, gP_01, 2, true },
{ gC_001, gP_0x1, 3, gC_001, gP_0x1, 3, false },
{ gC_001, nullptr, 3, gC_001, gP_0x1, 3, false },
{ gC_011, gP_001, 3, gC_11, gP_01, 2, true },
{ gC_011, gP_011, 3, gC_01, gP_01, 2, false },
{ gC_011, gP_0x1, 3, gC_011, gP_0x1, 3, false },
{ gC_011, nullptr, 3, gC_011, gP_0x1, 3, false },
{ gC_0011, gP_0011, 4, gC_0011, gP_0011, 4, false },
};
const SkTileMode modes[] = {
SkTileMode::kClamp, SkTileMode::kRepeat, SkTileMode::kMirror,
// TODO: add kDecal_TileMode when it is implemented
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gProcInfo); ++i) {
for (auto mode : modes) {
if (gProcInfo[i].fIsClampRestricted && mode != SkTileMode::kClamp) {
continue;
}
for (size_t t = 0; t < SK_ARRAY_COUNT(gTests); ++t) {
GradRec rec;
rec.fColorCount = gTests[t].fCount;
rec.fColors = gTests[t].fCol;
rec.fPos = gTests[t].fPos;
rec.fTileMode = mode;
rec.fPoint = gPts;
rec.fRadius = gRadii;
GradRec expected = rec;
if (!gTests[t].fRequiresNonClamp || mode != SkTileMode::kClamp) {
expected.fColorCount = gTests[t].fExpectedCount;
expected.fColors = gTests[t].fExpectedCol;
expected.fPos = gTests[t].fExpectedPos;
}
gProcInfo[i].fProc(reporter, rec, expected);
}
}
}
}
static void test_nearly_vertical(skiatest::Reporter* reporter) {
auto surface(SkSurface::MakeRasterN32Premul(200, 200));
const SkPoint pts[] = {{ 100, 50 }, { 100.0001f, 50000 }};
const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
const SkScalar pos[] = { 0, 1 };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 2, SkTileMode::kClamp));
surface->getCanvas()->drawPaint(paint);
}
static void test_vertical(skiatest::Reporter* reporter) {
auto surface(SkSurface::MakeRasterN32Premul(200, 200));
const SkPoint pts[] = {{ 100, 50 }, { 100, 50 }};
const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
const SkScalar pos[] = { 0, 1 };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 2, SkTileMode::kClamp));
surface->getCanvas()->drawPaint(paint);
}
// A linear gradient interval can, due to numerical imprecision (likely in the divide)
// finish an interval with the final fx not landing outside of [p0...p1].
// The old code had an assert which this test triggered.
// We now explicitly clamp the resulting fx value.
static void test_linear_fuzz(skiatest::Reporter* reporter) {
auto surface(SkSurface::MakeRasterN32Premul(1300, 630));
const SkPoint pts[] = {{ 179.5f, -179.5f }, { 1074.5f, 715.5f }};
const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE };
const SkScalar pos[] = {0, 0.200000003f, 0.800000012f, 1 };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 4, SkTileMode::kClamp));
SkRect r = {0, 83, 1254, 620};
surface->getCanvas()->drawRect(r, paint);
}
// https://bugs.chromium.org/p/skia/issues/detail?id=5023
// We should still shade pixels for which the radius is exactly 0.
static void test_two_point_conical_zero_radius(skiatest::Reporter* reporter) {
auto surface(SkSurface::MakeRasterN32Premul(5, 5));
surface->getCanvas()->clear(SK_ColorRED);
const SkColor colors[] = { SK_ColorGREEN, SK_ColorBLUE };
SkPaint p;
p.setShader(SkGradientShader::MakeTwoPointConical(
SkPoint::Make(2.5f, 2.5f), 0,
SkPoint::Make(3.0f, 3.0f), 10,
colors, nullptr, SK_ARRAY_COUNT(colors), SkTileMode::kClamp));
surface->getCanvas()->drawPaint(p);
// r == 0 for the center pixel.
// verify that we draw it (no red bleed)
SkPMColor centerPMColor;
surface->readPixels(SkImageInfo::MakeN32Premul(1, 1), &centerPMColor, sizeof(SkPMColor), 2, 2);
REPORTER_ASSERT(reporter, SkGetPackedR32(centerPMColor) == 0);
}
// http://crbug.com/599458
static void test_clamping_overflow(skiatest::Reporter*) {
SkPaint p;
const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN };
const SkPoint pts1[] = { SkPoint::Make(1001, 1000001), SkPoint::Make(1000.99f, 1000000) };
p.setShader(SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkTileMode::kClamp));
sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(50, 50));
surface->getCanvas()->scale(100, 100);
surface->getCanvas()->drawPaint(p);
const SkPoint pts2[] = { SkPoint::Make(10000.99f, 1000000), SkPoint::Make(10001, 1000001) };
p.setShader(SkGradientShader::MakeLinear(pts2, colors, nullptr, 2, SkTileMode::kClamp));
surface->getCanvas()->drawPaint(p);
// Passes if we don't trigger asserts.
}
// http://crbug.com/636194
static void test_degenerate_linear(skiatest::Reporter*) {
SkPaint p;
const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN };
const SkPoint pts[] = {
SkPoint::Make(-46058024627067344430605278824628224.0f, 0),
SkPoint::Make(SK_ScalarMax, 0)
};
p.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp));
sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(50, 50));
surface->getCanvas()->drawPaint(p);
// Passes if we don't trigger asserts.
}
// http://crbug.com/1149216
static void test_unsorted_degenerate(skiatest::Reporter* r) {
// Passes if a valid solid color is computed for the degenerate gradient
// (unsorted positions are fixed during regular gradient construction, so this ensures the
// same fixing happens for degenerate gradients as well). If they aren't fixed, this test
// case produces a negative alpha, which asserts during SkPMColor4f::isOpaque().
const SkColor4f colors[] = { {0.f, 0.f, 0.f, 0.f},
{0.00784314f, 0.f, 0.f, 0.0627451f},
{0.f, 0.00392157f, 0.f, 0.f} };
const SkScalar positions[] = {0.00753367f, 8.54792e-44f, 1.46955e-39f};
const SkPoint points[] { { 0.f, 0.f }, { 1e-20f, -1e-8f }}; // must be degenerate
// Use kMirror to go through average color stop calculation, vs. kClamp which would pick a color
sk_sp<SkShader> gradient = SkGradientShader::MakeLinear(points, colors, nullptr, positions, 3,
SkTileMode::kMirror);
// The degenerate gradient shouldn't be null
REPORTER_ASSERT(r, SkToBool(gradient));
// And it shouldn't crash when creating a fragment processor
SkMatrixProvider provider(SkMatrix::I());
GrColorInfo dstColorInfo(GrColorType::kRGBA_8888, kPremul_SkAlphaType,
SkColorSpace::MakeSRGB());
GrMockOptions options;
auto context = GrDirectContext::MakeMock(&options);
GrFPArgs args(context.get(), provider, &dstColorInfo);
as_SB(gradient)->asFragmentProcessor(args);
}
// "Interesting" fuzzer values.
static void test_linear_fuzzer(skiatest::Reporter*) {
static const SkColor gColors0[] = { 0x30303030, 0x30303030 };
static const SkColor gColors1[] = { 0x30303030, 0x30303030, 0x30303030 };
static const SkScalar gPos1[] = { 0, 0, 1 };
static const SkScalar gMatrix0[9] = {
6.40969056e-10f, 0 , 6.40969056e-10f,
0 , 4.42539023e-39f, 6.40969056e-10f,
0 , 0 , 1
};
static const SkScalar gMatrix1[9] = {
-2.75294113f , 6.40969056e-10f, 6.40969056e-10f,
6.40969056e-10f, 6.40969056e-10f, -3.32810161e+24f,
6.40969056e-10f, 6.40969056e-10f, 0
};
static const SkScalar gMatrix2[9] = {
7.93481258e+17f, 6.40969056e-10f, 6.40969056e-10f,
6.40969056e-10f, 6.40969056e-10f, 6.40969056e-10f,
6.40969056e-10f, 6.40969056e-10f, 0.688235283f
};
static const SkScalar gMatrix3[9] = {
1.89180674e+11f, 6.40969056e-10f, 6.40969056e-10f,
6.40969056e-10f, 6.40969056e-10f, 6.40969056e-10f,
6.40969056e-10f, 11276.0469f , 8.12524808e+20f
};
static const struct {
SkPoint fPts[2];
const SkColor* fColors;
const SkScalar* fPos;
int fCount;
SkTileMode fTileMode;
uint32_t fFlags;
const SkScalar* fLocalMatrix;
const SkScalar* fGlobalMatrix;
} gConfigs[] = {
{
{{0, -2.752941f}, {0, 0}},
gColors0,
nullptr,
SK_ARRAY_COUNT(gColors0),
SkTileMode::kClamp,
0,
gMatrix0,
nullptr
},
{
{{4.42539023e-39f, -4.42539023e-39f}, {9.78041162e-15f, 4.42539023e-39f}},
gColors1,
gPos1,
SK_ARRAY_COUNT(gColors1),
SkTileMode::kClamp,
0,
nullptr,
gMatrix1
},
{
{{4.42539023e-39f, 6.40969056e-10f}, {6.40969056e-10f, 1.49237238e-19f}},
gColors1,
gPos1,
SK_ARRAY_COUNT(gColors1),
SkTileMode::kClamp,
0,
nullptr,
gMatrix2
},
{
{{6.40969056e-10f, 6.40969056e-10f}, {6.40969056e-10f, -0.688235283f}},
gColors0,
nullptr,
SK_ARRAY_COUNT(gColors0),
SkTileMode::kClamp,
0,
gMatrix3,
nullptr
},
};
sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
SkColorSpace* colorSpaces[] = {
nullptr, // hits the legacy gradient impl
srgb.get(), // triggers 4f/raster-pipeline
};
SkPaint paint;
for (const SkColorSpace* colorSpace : colorSpaces) {
sk_sp<SkSurface> surface = SkSurface::MakeRaster(SkImageInfo::Make(100, 100,
kN32_SkColorType,
kPremul_SkAlphaType,
sk_ref_sp(colorSpace)));
SkCanvas* canvas = surface->getCanvas();
for (const auto& config : gConfigs) {
SkAutoCanvasRestore acr(canvas, false);
SkTLazy<SkMatrix> localMatrix;
if (config.fLocalMatrix) {
localMatrix.init();
localMatrix->set9(config.fLocalMatrix);
}
paint.setShader(SkGradientShader::MakeLinear(config.fPts,
config.fColors,
config.fPos,
config.fCount,
config.fTileMode,
config.fFlags,
localMatrix.getMaybeNull()));
if (config.fGlobalMatrix) {
SkMatrix m;
m.set9(config.fGlobalMatrix);
canvas->save();
canvas->concat(m);
}
canvas->drawPaint(paint);
}
}
}
static void test_sweep_fuzzer(skiatest::Reporter*) {
static const SkColor gColors0[] = { 0x30303030, 0x30303030, 0x30303030 };
static const SkScalar gPos0[] = { -47919293023455565225163489280.0f, 0, 1 };
static const SkScalar gMatrix0[9] = {
1.12116716e-13f, 0 , 8.50489682e+16f,
4.1917041e-41f , 3.51369881e-23f, -2.54344271e-26f,
9.61111907e+17f, -3.35263808e-29f, -1.35659403e+14f
};
static const struct {
SkPoint fCenter;
const SkColor* fColors;
const SkScalar* fPos;
int fCount;
const SkScalar* fGlobalMatrix;
} gConfigs[] = {
{
{ 0, 0 },
gColors0,
gPos0,
SK_ARRAY_COUNT(gColors0),
gMatrix0
},
};
sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(100, 100);
SkCanvas* canvas = surface->getCanvas();
SkPaint paint;
for (const auto& config : gConfigs) {
paint.setShader(SkGradientShader::MakeSweep(config.fCenter.x(),
config.fCenter.y(),
config.fColors,
config.fPos,
config.fCount));
SkAutoCanvasRestore acr(canvas, false);
if (config.fGlobalMatrix) {
SkMatrix m;
m.set9(config.fGlobalMatrix);
canvas->save();
canvas->concat(m);
}
canvas->drawPaint(paint);
}
}
DEF_TEST(Gradient, reporter) {
TestGradientShaders(reporter);
TestGradientOptimization(reporter);
TestConstantGradient(reporter);
test_big_grad(reporter);
test_nearly_vertical(reporter);
test_vertical(reporter);
test_linear_fuzz(reporter);
test_two_point_conical_zero_radius(reporter);
test_clamping_overflow(reporter);
test_degenerate_linear(reporter);
test_linear_fuzzer(reporter);
test_sweep_fuzzer(reporter);
test_unsorted_degenerate(reporter);
}
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