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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.
- */
- // Unit tests for src/core/SkPoint.cpp and its header
- #include "include/core/SkRect.h"
- #include "src/core/SkPointPriv.h"
- #include "tests/Test.h"
- static void test_casts(skiatest::Reporter* reporter) {
- SkPoint p = { 0, 0 };
- SkRect r = { 0, 0, 0, 0 };
- const SkScalar* pPtr = reinterpret_cast<const SkScalar*>(&p);
- const SkScalar* rPtr = reinterpret_cast<const SkScalar*>(&r);
- REPORTER_ASSERT(reporter, SkPointPriv::AsScalars(p) == pPtr);
- REPORTER_ASSERT(reporter, r.asScalars() == rPtr);
- }
- // Tests SkPoint::Normalize() for this (x,y)
- static void test_Normalize(skiatest::Reporter* reporter,
- SkScalar x, SkScalar y) {
- SkPoint point;
- point.set(x, y);
- SkScalar oldLength = point.length();
- SkScalar returned = SkPoint::Normalize(&point);
- SkScalar newLength = point.length();
- REPORTER_ASSERT(reporter, SkScalarNearlyEqual(returned, oldLength));
- REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, SK_Scalar1));
- }
- static void test_normalize_cannormalize_consistent(skiatest::Reporter* reporter) {
- const SkScalar values[] = { 1, 1e18f, 1e20f, 1e38f, SK_ScalarInfinity, SK_ScalarNaN };
- for (SkScalar val : values) {
- const SkScalar variants[] = { val, -val, SkScalarInvert(val), -SkScalarInvert(val) };
- for (SkScalar v : variants) {
- const SkPoint pts[] = { { 0, v }, { v, 0 }, { 1, v }, { v, 1 }, { v, v } };
- for (SkPoint p : pts) {
- bool can = SkPointPriv::CanNormalize(p.fX, p.fY);
- bool nor = p.normalize();
- REPORTER_ASSERT(reporter, can == nor);
- }
- }
- }
- }
- // Tests that SkPoint::length() and SkPoint::Length() both return
- // approximately expectedLength for this (x,y).
- static void test_length(skiatest::Reporter* reporter, SkScalar x, SkScalar y,
- SkScalar expectedLength) {
- SkPoint point;
- point.set(x, y);
- SkScalar s1 = point.length();
- SkScalar s2 = SkPoint::Length(x, y);
- //The following should be exactly the same, but need not be.
- //See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
- REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, s2));
- REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, expectedLength));
- test_Normalize(reporter, x, y);
- }
- // Ugh. Windows compiler can dive into other .cpp files, and sometimes
- // notices that I will generate an overflow... which is exactly the point
- // of this test!
- //
- // To avoid this warning, I need to convince the compiler that I might not
- // use that big value, hence this hacky helper function: reporter is
- // ALWAYS non-null. (shhhhhh, don't tell the compiler that).
- template <typename T> T get_value(skiatest::Reporter* reporter, T value) {
- return reporter ? value : 0;
- }
- // On linux gcc, 32bit, we are seeing the compiler propagate up the value
- // of SkPoint::length() as a double (which we use sometimes to avoid overflow
- // during the computation), even though the signature says float (SkScalar).
- //
- // force_as_float is meant to capture our latest technique (horrible as
- // it is) to force the value to be a float, so we can test whether it was
- // finite or not.
- static float force_as_float(skiatest::Reporter* reporter, float value) {
- uint32_t storage;
- memcpy(&storage, &value, 4);
- // even the pair of memcpy calls are not sufficient, since those seem to
- // be no-op'd, so we add a runtime tests (just like get_value) to force
- // the compiler to give us an actual float.
- if (nullptr == reporter) {
- storage = ~storage;
- }
- memcpy(&value, &storage, 4);
- return value;
- }
- // test that we handle very large values correctly. i.e. that we can
- // successfully normalize something whose mag overflows a float.
- static void test_overflow(skiatest::Reporter* reporter) {
- SkScalar bigFloat = get_value(reporter, 3.4e38f);
- SkPoint pt = { bigFloat, bigFloat };
- SkScalar length = pt.length();
- length = force_as_float(reporter, length);
- // expect this to be non-finite, but dump the results if not.
- if (SkScalarIsFinite(length)) {
- SkDebugf("length(%g, %g) == %g\n", pt.fX, pt.fY, length);
- REPORTER_ASSERT(reporter, !SkScalarIsFinite(length));
- }
- // this should succeed, even though we can't represent length
- REPORTER_ASSERT(reporter, pt.setLength(SK_Scalar1));
- // now that pt is normalized, we check its length
- length = pt.length();
- REPORTER_ASSERT(reporter, SkScalarNearlyEqual(length, SK_Scalar1));
- }
- DEF_TEST(Point, reporter) {
- test_casts(reporter);
- static const struct {
- SkScalar fX;
- SkScalar fY;
- SkScalar fLength;
- } gRec[] = {
- { SkIntToScalar(3), SkIntToScalar(4), SkIntToScalar(5) },
- { 0.6f, 0.8f, SK_Scalar1 },
- };
- for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
- test_length(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fLength);
- }
- test_overflow(reporter);
- test_normalize_cannormalize_consistent(reporter);
- }
- DEF_TEST(Point_setLengthFast, reporter) {
- // Scale a (1,1) point to a bunch of different lengths,
- // making sure the slow and fast paths are within 0.1%.
- const float tests[] = { 1.0f, 0.0f, 1.0e-37f, 3.4e38f, 42.0f, 0.00012f };
- const SkPoint kOne = {1.0f, 1.0f};
- for (unsigned i = 0; i < SK_ARRAY_COUNT(tests); i++) {
- SkPoint slow = kOne, fast = kOne;
- slow.setLength(tests[i]);
- SkPointPriv::SetLengthFast(&fast, tests[i]);
- if (slow.length() < FLT_MIN && fast.length() < FLT_MIN) continue;
- SkScalar ratio = slow.length() / fast.length();
- REPORTER_ASSERT(reporter, ratio > 0.999f);
- REPORTER_ASSERT(reporter, ratio < 1.001f);
- }
- }
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