1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 // Unit tests for src/core/SkPoint3.cpp and its header
9
10 #include "SkPoint3.h"
11 #include "Test.h"
12
test_eq_ops(skiatest::Reporter * reporter)13 static void test_eq_ops(skiatest::Reporter* reporter) {
14 const SkPoint3 p0 = SkPoint3::Make(0, 0, 0);
15 const SkPoint3 p1 = SkPoint3::Make(1, 1, 1);
16 const SkPoint3 p2 = SkPoint3::Make(1, 1, 1);
17
18 REPORTER_ASSERT(reporter, p0 != p1);
19 REPORTER_ASSERT(reporter, p1 == p2);
20 }
21
test_ops(skiatest::Reporter * reporter)22 static void test_ops(skiatest::Reporter* reporter) {
23 SkPoint3 v = SkPoint3::Make(1, 1, 1);
24 v.normalize();
25 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(v.length(), SK_Scalar1));
26
27 // scale
28 SkPoint3 p = v.makeScale(3.0f);
29 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.length(), 3.0f));
30
31 p.scale(1.0f/3.0f);
32 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.length(), SK_Scalar1));
33
34 SkPoint3 p1 = SkPoint3::Make(20.0f, 2.0f, 10.0f);
35 SkPoint3 p2 = -p1;
36
37 // -
38 p = p1 - p1;
39 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.x(), 0.0f));
40 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.y(), 0.0f));
41 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.z(), 0.0f));
42
43 // +
44 p = p1 + p2;
45 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.x(), 0.0f));
46 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.y(), 0.0f));
47 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.z(), 0.0f));
48 }
49
test_dot(skiatest::Reporter * reporter)50 static void test_dot(skiatest::Reporter* reporter) {
51 const SkPoint3 xAxis = SkPoint3::Make(1.0f, 0.0f, 0.0f);
52 const SkPoint3 yAxis = SkPoint3::Make(0.0f, 1.0f, 0.0f);
53 const SkPoint3 zAxis = SkPoint3::Make(0.0f, 0.0f, 1.0f);
54
55 SkScalar dot = xAxis.dot(yAxis);
56 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
57
58 dot = yAxis.dot(zAxis);
59 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
60
61 dot = zAxis.dot(xAxis);
62 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
63
64 SkPoint3 v = SkPoint3::Make(13.0f, 2.0f, 7.0f);
65 v.normalize();
66
67 dot = v.dot(v);
68 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 1.0f));
69
70 v = SkPoint3::Make(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2, 0.0f);
71
72 dot = xAxis.dot(v);
73 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, SK_ScalarRoot2Over2));
74
75 dot = yAxis.dot(v);
76 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, SK_ScalarRoot2Over2));
77 }
78
test_length(skiatest::Reporter * reporter,SkScalar x,SkScalar y,SkScalar z,SkScalar expectedLen)79 static void test_length(skiatest::Reporter* reporter,
80 SkScalar x, SkScalar y, SkScalar z, SkScalar expectedLen) {
81 SkPoint3 point = SkPoint3::Make(x, y, z);
82
83 SkScalar s1 = point.length();
84 SkScalar s2 = SkPoint3::Length(x, y, z);
85
86 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, s2));
87 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, expectedLen));
88 }
89
test_normalize(skiatest::Reporter * reporter,SkScalar x,SkScalar y,SkScalar z,SkScalar expectedLen)90 static void test_normalize(skiatest::Reporter* reporter,
91 SkScalar x, SkScalar y, SkScalar z, SkScalar expectedLen) {
92 SkPoint3 point = SkPoint3::Make(x, y, z);
93
94 bool result = point.normalize();
95 SkScalar newLength = point.length();
96
97 if (0 == expectedLen) {
98 const SkPoint3 empty = SkPoint3::Make(0.0f, 0.0f, 0.0f);
99
100 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, 0));
101 REPORTER_ASSERT(reporter, !result);
102 REPORTER_ASSERT(reporter, point == empty);
103 } else {
104 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, SK_Scalar1));
105 REPORTER_ASSERT(reporter, result);
106 }
107 }
108
DEF_TEST(Point3,reporter)109 DEF_TEST(Point3, reporter) {
110 test_eq_ops(reporter);
111 test_ops(reporter);
112 test_dot(reporter);
113
114 static const struct {
115 SkScalar fX;
116 SkScalar fY;
117 SkScalar fZ;
118 SkScalar fLength;
119 } gRec[] = {
120 { 0.0f, 0.0f, 0.0f, 0.0f },
121 { 0.3f, 0.4f, 0.5f, SK_ScalarRoot2Over2 },
122 { 1.0e-37f, 1.0e-37f, 1.0e-37f, 0.0f }, // underflows
123 { 3.4e38f, 0.0f, 0.0f, 3.4e38f } // overflows
124 };
125
126 for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
127 test_length(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fZ, gRec[i].fLength);
128 test_normalize(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fZ, gRec[i].fLength);
129 }
130 }
131