Point3Test.cpp 4.5 KB

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  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. // Unit tests for src/core/SkPoint3.cpp and its header
  8. #include "include/core/SkPoint3.h"
  9. #include "include/utils/SkRandom.h"
  10. #include "tests/Test.h"
  11. static void test_eq_ops(skiatest::Reporter* reporter) {
  12. const SkPoint3 p0 = SkPoint3::Make(0, 0, 0);
  13. const SkPoint3 p1 = SkPoint3::Make(1, 1, 1);
  14. const SkPoint3 p2 = SkPoint3::Make(1, 1, 1);
  15. REPORTER_ASSERT(reporter, p0 != p1);
  16. REPORTER_ASSERT(reporter, p1 == p2);
  17. }
  18. static void test_ops(skiatest::Reporter* reporter) {
  19. SkPoint3 v = SkPoint3::Make(1, 1, 1);
  20. v.normalize();
  21. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(v.length(), SK_Scalar1));
  22. // scale
  23. SkPoint3 p = v.makeScale(3.0f);
  24. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.length(), 3.0f));
  25. p.scale(1.0f/3.0f);
  26. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.length(), SK_Scalar1));
  27. SkPoint3 p1 = SkPoint3::Make(20.0f, 2.0f, 10.0f);
  28. SkPoint3 p2 = -p1;
  29. // -
  30. p = p1 - p1;
  31. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.x(), 0.0f));
  32. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.y(), 0.0f));
  33. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.z(), 0.0f));
  34. // +
  35. p = p1 + p2;
  36. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.x(), 0.0f));
  37. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.y(), 0.0f));
  38. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(p.z(), 0.0f));
  39. }
  40. static void test_dot(skiatest::Reporter* reporter) {
  41. const SkPoint3 xAxis = SkPoint3::Make(1.0f, 0.0f, 0.0f);
  42. const SkPoint3 yAxis = SkPoint3::Make(0.0f, 1.0f, 0.0f);
  43. const SkPoint3 zAxis = SkPoint3::Make(0.0f, 0.0f, 1.0f);
  44. SkScalar dot = xAxis.dot(yAxis);
  45. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
  46. dot = yAxis.dot(zAxis);
  47. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
  48. dot = zAxis.dot(xAxis);
  49. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 0.0f));
  50. SkPoint3 v = SkPoint3::Make(13.0f, 2.0f, 7.0f);
  51. v.normalize();
  52. dot = v.dot(v);
  53. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, 1.0f));
  54. v = SkPoint3::Make(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2, 0.0f);
  55. dot = xAxis.dot(v);
  56. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, SK_ScalarRoot2Over2));
  57. dot = yAxis.dot(v);
  58. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dot, SK_ScalarRoot2Over2));
  59. }
  60. static void test_length(skiatest::Reporter* reporter,
  61. SkScalar x, SkScalar y, SkScalar z, SkScalar expectedLen) {
  62. SkPoint3 point = SkPoint3::Make(x, y, z);
  63. SkScalar s1 = point.length();
  64. SkScalar s2 = SkPoint3::Length(x, y, z);
  65. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, s2));
  66. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, expectedLen));
  67. }
  68. static void test_normalize(skiatest::Reporter* reporter,
  69. SkScalar x, SkScalar y, SkScalar z, SkScalar expectedLen) {
  70. SkPoint3 point = SkPoint3::Make(x, y, z);
  71. bool result = point.normalize();
  72. SkScalar newLength = point.length();
  73. if (0 == expectedLen) {
  74. const SkPoint3 empty = SkPoint3::Make(0.0f, 0.0f, 0.0f);
  75. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, 0));
  76. REPORTER_ASSERT(reporter, !result);
  77. REPORTER_ASSERT(reporter, point == empty);
  78. } else {
  79. REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, SK_Scalar1));
  80. REPORTER_ASSERT(reporter, result);
  81. }
  82. SkRandom random;
  83. random.setSeed(1234);
  84. SkPoint3 pt3;
  85. int testCount = 100000;
  86. for (int index = 0; index < testCount; ++index) {
  87. SkScalar testVal;
  88. do {
  89. testVal = random.nextRangeF(0, 2);
  90. } while (!testVal);
  91. pt3.set(testVal, 0, 0);
  92. REPORTER_ASSERT(reporter, !pt3.normalize() || 1 == pt3.fX);
  93. }
  94. }
  95. DEF_TEST(Point3, reporter) {
  96. test_eq_ops(reporter);
  97. test_ops(reporter);
  98. test_dot(reporter);
  99. static const struct {
  100. SkScalar fX;
  101. SkScalar fY;
  102. SkScalar fZ;
  103. SkScalar fLength;
  104. } gRec[] = {
  105. { 0.0f, 0.0f, 0.0f, 0.0f },
  106. { 0.3f, 0.4f, 0.5f, SK_ScalarRoot2Over2 },
  107. { 1.0e-37f, 1.0e-37f, 1.0e-37f, 0.0f }, // underflows
  108. { 3.4e38f, 0.0f, 0.0f, 3.4e38f } // overflows
  109. };
  110. for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
  111. test_length(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fZ, gRec[i].fLength);
  112. test_normalize(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fZ, gRec[i].fLength);
  113. }
  114. }