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skia2/tests/PolyUtilsTest.cpp
Jim Van Verth 061cc21b61 Add more tests for PolyUtils 
* Add fuzzer
* Add bench tests
* Add additional unit test
* Fix some bugs these exposed.

Bug: skia:
Change-Id: I6c587c92cb6cff32ab8300020b78f9f247d2bf64
Reviewed-on: https://skia-review.googlesource.com/139169
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2018-07-11 18:37:38 +00:00

258 lines
13 KiB
C++
Raw Blame History

/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkPolyUtils.h"
DEF_TEST(PolyUtils, reporter) {
SkTDArray<SkPoint> poly;
// init simple index map
uint16_t indexMap[1024];
for (int i = 0; i < 1024; ++i) {
indexMap[i] = i;
}
SkTDArray<uint16_t> triangleIndices;
// skinny triangle
*poly.push() = SkPoint::Make(-100, 55);
*poly.push() = SkPoint::Make(100, 55);
*poly.push() = SkPoint::Make(102.5f, 54.330127f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// switch winding
poly[2].set(102.5f, 55.330127f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// make degenerate
poly[2].set(100 + 2.5f, 55);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);
// TODO: should these fail?
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// giant triangle
poly[0].set(-1.0e+37f, 1.0e+37f);
poly[1].set(1.0e+37f, 1.0e+37f);
poly[2].set(-1.0e+37f, -1.0e+37f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// teeny triangle
poly[0].set(-1.0e-38f, 1.0e-38f);
poly[1].set(-1.0e-38f, -1.0e-38f);
poly[2].set(1.0e-38f, 1.0e-38f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);
// TODO: should these fail?
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// triangle way off in space (relative to size so we don't completely obliterate values)
poly[0].set(-100 + 1.0e+9f, 55 - 1.0e+9f);
poly[1].set(100 + 1.0e+9f, 55 - 1.0e+9f);
poly[2].set(150 + 1.0e+9f, 100 - 1.0e+9f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
///////////////////////////////////////////////////////////////////////
// round rect
poly.rewind();
*poly.push() = SkPoint::Make(-100, 55);
*poly.push() = SkPoint::Make(100, 55);
*poly.push() = SkPoint::Make(100 + 2.5f, 50 + 4.330127f);
*poly.push() = SkPoint::Make(100 + 3.535534f, 50 + 3.535534f);
*poly.push() = SkPoint::Make(100 + 4.330127f, 50 + 2.5f);
*poly.push() = SkPoint::Make(105, 50);
*poly.push() = SkPoint::Make(105, -50);
*poly.push() = SkPoint::Make(100 + 4.330127f, -50 - 2.5f);
*poly.push() = SkPoint::Make(100 + 3.535534f, -50 - 3.535534f);
*poly.push() = SkPoint::Make(100 + 2.5f, -50 - 4.330127f);
*poly.push() = SkPoint::Make(100, -55);
*poly.push() = SkPoint::Make(-100, -55);
*poly.push() = SkPoint::Make(-100 - 2.5f, -50 - 4.330127f);
*poly.push() = SkPoint::Make(-100 - 3.535534f, -50 - 3.535534f);
*poly.push() = SkPoint::Make(-100 - 4.330127f, -50 - 2.5f);
*poly.push() = SkPoint::Make(-105, -50);
*poly.push() = SkPoint::Make(-105, 50);
*poly.push() = SkPoint::Make(-100 - 4.330127f, 50 + 2.5f);
*poly.push() = SkPoint::Make(-100 - 3.535534f, 50 + 3.535534f);
*poly.push() = SkPoint::Make(-100 - 2.5f, 50 + 4.330127f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// translate far enough to obliterate some low bits
for (int i = 0; i < poly.count(); ++i) {
poly[i].offset(1.0e+7f, 1.0e+7f);
}
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);
// Due to floating point error it's no longer convex
REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// translate a little farther to create some coincident vertices
for (int i = 0; i < poly.count(); ++i) {
poly[i].offset(4.0e+7f, 4.0e+7f);
}
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
// These can't handle coincident vertices
REPORTER_ASSERT(reporter, !SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// troublesome case -- clipped roundrect
poly.rewind();
*poly.push() = SkPoint::Make(335.928101f, 428.219055f);
*poly.push() = SkPoint::Make(330.414459f, 423.034912f);
*poly.push() = SkPoint::Make(325.749084f, 417.395508f);
*poly.push() = SkPoint::Make(321.931946f, 411.300842f);
*poly.push() = SkPoint::Make(318.963074f, 404.750977f);
*poly.push() = SkPoint::Make(316.842468f, 397.745850f);
*poly.push() = SkPoint::Make(315.570068f, 390.285522f);
*poly.push() = SkPoint::Make(315.145966f, 382.369965f);
*poly.push() = SkPoint::Make(315.570068f, 374.454346f);
*poly.push() = SkPoint::Make(316.842468f, 366.994019f);
*poly.push() = SkPoint::Make(318.963074f, 359.988892f);
*poly.push() = SkPoint::Make(321.931946f, 353.439056f);
*poly.push() = SkPoint::Make(325.749084f, 347.344421f);
*poly.push() = SkPoint::Make(330.414459f, 341.705017f);
*poly.push() = SkPoint::Make(335.928101f, 336.520813f);
*poly.push() = SkPoint::Make(342.289948f, 331.791901f);
*poly.push() = SkPoint::Make(377.312134f, 331.791901f);
*poly.push() = SkPoint::Make(381.195313f, 332.532593f);
*poly.push() = SkPoint::Make(384.464935f, 334.754700f);
*poly.push() = SkPoint::Make(386.687042f, 338.024292f);
*poly.push() = SkPoint::Make(387.427765f, 341.907532f);
*poly.push() = SkPoint::Make(387.427765f, 422.832367f);
*poly.push() = SkPoint::Make(386.687042f, 426.715576f);
*poly.push() = SkPoint::Make(384.464935f, 429.985168f);
*poly.push() = SkPoint::Make(381.195313f, 432.207275f);
*poly.push() = SkPoint::Make(377.312134f, 432.947998f);
*poly.push() = SkPoint::Make(342.289948f, 432.947998f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// a star is born
poly.rewind();
*poly.push() = SkPoint::Make(0.0f, -50.0f);
*poly.push() = SkPoint::Make(14.43f, -25.0f);
*poly.push() = SkPoint::Make(43.30f, -25.0f);
*poly.push() = SkPoint::Make(28.86f, 0.0f);
*poly.push() = SkPoint::Make(43.30f, 25.0f);
*poly.push() = SkPoint::Make(14.43f, 25.0f);
*poly.push() = SkPoint::Make(0.0f, 50.0f);
*poly.push() = SkPoint::Make(-14.43f, 25.0f);
*poly.push() = SkPoint::Make(-43.30f, 25.0f);
*poly.push() = SkPoint::Make(-28.86f, 0.0f);
*poly.push() = SkPoint::Make(-43.30f, -25.0f);
*poly.push() = SkPoint::Make(-14.43f, -25.0f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// many spiked star
{
const SkScalar c = SkIntToScalar(45);
const SkScalar r1 = SkIntToScalar(20);
const SkScalar r2 = SkIntToScalar(3);
const int n = 500;
poly.rewind();
SkScalar rad = 0;
const SkScalar drad = SK_ScalarPI / n;
for (int i = 0; i < n; i++) {
SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
*poly.push() = SkPoint::Make(c + cosV * r1, c + sinV * r1);
rad += drad;
sinV = SkScalarSinCos(rad, &cosV);
*poly.push() = SkPoint::Make(c + cosV * r2, c + sinV * r2);
rad += drad;
}
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
}
// self-intersecting polygon
poly.rewind();
*poly.push() = SkPoint::Make(0.0f, -50.0f);
*poly.push() = SkPoint::Make(14.43f, -25.0f);
*poly.push() = SkPoint::Make(43.30f, -25.0f);
*poly.push() = SkPoint::Make(-28.86f, 0.0f);
*poly.push() = SkPoint::Make(43.30f, 25.0f);
*poly.push() = SkPoint::Make(14.43f, 25.0f);
*poly.push() = SkPoint::Make(0.0f, 50.0f);
*poly.push() = SkPoint::Make(-14.43f, 25.0f);
*poly.push() = SkPoint::Make(-43.30f, 25.0f);
*poly.push() = SkPoint::Make(28.86f, 0.0f);
*poly.push() = SkPoint::Make(-43.30f, -25.0f);
*poly.push() = SkPoint::Make(-14.43f, -25.0f);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);
REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, !SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
// running this just to make sure it doesn't crash
// the fact that it succeeds doesn't mean anything since the input is not simple
REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
// self-intersecting polygon with coincident point
poly.rewind();
*poly.push() = SkPoint::Make(0.0f, 0.0f);
*poly.push() = SkPoint::Make(-50, -50);
*poly.push() = SkPoint::Make(50, -50);
*poly.push() = SkPoint::Make(0.00000001f, -0.00000001f);
*poly.push() = SkPoint::Make(-50, 50);
*poly.push() = SkPoint::Make(50, 50);
REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);
REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));
REPORTER_ASSERT(reporter, !SkIsSimplePolygon(poly.begin(), poly.count()));
triangleIndices.rewind();
// running this just to make sure it doesn't crash
REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),
&triangleIndices));
}
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