epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
epoger@google.com | 1fd56dc | 2011-06-15 18:04:58 +0000 | [diff] [blame] | 8 | // Unit tests for src/core/SkPoint.cpp and its header |
| 9 | |
| 10 | #include "SkPoint.h" |
reed@google.com | c7d0ea3 | 2013-03-08 16:07:54 +0000 | [diff] [blame] | 11 | #include "SkRect.h" |
epoger@google.com | 1fd56dc | 2011-06-15 18:04:58 +0000 | [diff] [blame] | 12 | #include "Test.h" |
| 13 | |
reed@google.com | c7d0ea3 | 2013-03-08 16:07:54 +0000 | [diff] [blame] | 14 | static void test_casts(skiatest::Reporter* reporter) { |
| 15 | SkPoint p = { 0, 0 }; |
| 16 | SkRect r = { 0, 0, 0, 0 }; |
| 17 | |
| 18 | const SkScalar* pPtr = SkTCast<const SkScalar*>(&p); |
| 19 | const SkScalar* rPtr = SkTCast<const SkScalar*>(&r); |
| 20 | |
| 21 | REPORTER_ASSERT(reporter, p.asScalars() == pPtr); |
| 22 | REPORTER_ASSERT(reporter, r.asScalars() == rPtr); |
| 23 | } |
| 24 | |
epoger@google.com | 1fd56dc | 2011-06-15 18:04:58 +0000 | [diff] [blame] | 25 | // Tests SkPoint::Normalize() for this (x,y) |
| 26 | static void test_Normalize(skiatest::Reporter* reporter, |
| 27 | SkScalar x, SkScalar y) { |
| 28 | SkPoint point; |
| 29 | point.set(x, y); |
| 30 | SkScalar oldLength = point.length(); |
| 31 | SkScalar returned = SkPoint::Normalize(&point); |
| 32 | SkScalar newLength = point.length(); |
bungeman@google.com | b7b5d93 | 2012-08-24 19:53:58 +0000 | [diff] [blame] | 33 | REPORTER_ASSERT(reporter, SkScalarNearlyEqual(returned, oldLength)); |
epoger@google.com | 1fd56dc | 2011-06-15 18:04:58 +0000 | [diff] [blame] | 34 | REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, SK_Scalar1)); |
| 35 | } |
| 36 | |
reed@google.com | 5a5fe58 | 2013-05-03 15:59:39 +0000 | [diff] [blame^] | 37 | // Tests that SkPoint::length() and SkPoint::Length() both return |
| 38 | // approximately expectedLength for this (x,y). |
| 39 | static void test_length(skiatest::Reporter* reporter, SkScalar x, SkScalar y, |
| 40 | SkScalar expectedLength) { |
| 41 | SkPoint point; |
| 42 | point.set(x, y); |
| 43 | SkScalar s1 = point.length(); |
| 44 | SkScalar s2 = SkPoint::Length(x, y); |
| 45 | //The following should be exactly the same, but need not be. |
| 46 | //See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 |
| 47 | REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, s2)); |
| 48 | REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, expectedLength)); |
| 49 | |
| 50 | test_Normalize(reporter, x, y); |
| 51 | } |
| 52 | |
| 53 | // test that we handle very large values correctly. i.e. that we can |
| 54 | // successfully normalize something whose mag overflows a float. |
| 55 | static void test_overflow(skiatest::Reporter* reporter) { |
| 56 | SkPoint pt = { SkFloatToScalar(3.4e38f), SkFloatToScalar(3.4e38f) }; |
| 57 | |
| 58 | SkScalar length = pt.length(); |
| 59 | REPORTER_ASSERT(reporter, !SkScalarIsFinite(length)); |
| 60 | |
| 61 | // this should succeed, even though we can't represent length |
| 62 | REPORTER_ASSERT(reporter, pt.setLength(SK_Scalar1)); |
| 63 | |
| 64 | // now that pt is normalized, we check its length |
| 65 | length = pt.length(); |
| 66 | REPORTER_ASSERT(reporter, SkScalarNearlyEqual(length, SK_Scalar1)); |
| 67 | } |
| 68 | |
| 69 | // test that we handle very small values correctly. i.e. that we can |
| 70 | // report failure if we try to normalize them. |
| 71 | static void test_underflow(skiatest::Reporter* reporter) { |
| 72 | SkPoint pt = { SkFloatToScalar(1.0e-37f), SkFloatToScalar(1.0e-37f) }; |
| 73 | SkPoint copy = pt; |
| 74 | |
| 75 | REPORTER_ASSERT(reporter, 0 == SkPoint::Normalize(&pt)); |
| 76 | REPORTER_ASSERT(reporter, pt == copy); // pt is unchanged |
| 77 | |
| 78 | REPORTER_ASSERT(reporter, !pt.setLength(SK_Scalar1)); |
| 79 | REPORTER_ASSERT(reporter, pt == copy); // pt is unchanged |
| 80 | } |
| 81 | |
caryclark@google.com | 42639cd | 2012-06-06 12:03:39 +0000 | [diff] [blame] | 82 | static void PointTest(skiatest::Reporter* reporter) { |
reed@google.com | c7d0ea3 | 2013-03-08 16:07:54 +0000 | [diff] [blame] | 83 | test_casts(reporter); |
| 84 | |
reed@google.com | 5a5fe58 | 2013-05-03 15:59:39 +0000 | [diff] [blame^] | 85 | static const struct { |
| 86 | SkScalar fX; |
| 87 | SkScalar fY; |
| 88 | SkScalar fLength; |
| 89 | } gRec[] = { |
| 90 | { SkIntToScalar(3), SkIntToScalar(4), SkIntToScalar(5) }, |
| 91 | { SkFloatToScalar(0.6f), SkFloatToScalar(0.8f), SK_Scalar1 }, |
| 92 | }; |
| 93 | |
| 94 | for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) { |
| 95 | test_length(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fLength); |
| 96 | } |
| 97 | |
| 98 | test_underflow(reporter); |
| 99 | test_overflow(reporter); |
epoger@google.com | 1fd56dc | 2011-06-15 18:04:58 +0000 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | #include "TestClassDef.h" |
| 103 | DEFINE_TESTCLASS("Point", PointTestClass, PointTest) |