1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "ui/gfx/transform_util.h" 6 7 #include "testing/gtest/include/gtest/gtest.h" 8 #include "ui/gfx/point.h" 9 #include "ui/gfx/point3_f.h" 10 #include "ui/gfx/rect.h" 11 12 namespace gfx { 13 namespace { 14 15 TEST(TransformUtilTest, GetScaleTransform) { 16 const Point kAnchor(20, 40); 17 const float kScale = 0.5f; 18 19 Transform scale = GetScaleTransform(kAnchor, kScale); 20 21 const int kOffset = 10; 22 for (int sign_x = -1; sign_x <= 1; ++sign_x) { 23 for (int sign_y = -1; sign_y <= 1; ++sign_y) { 24 Point test(kAnchor.x() + sign_x * kOffset, 25 kAnchor.y() + sign_y * kOffset); 26 scale.TransformPoint(&test); 27 28 EXPECT_EQ(Point(kAnchor.x() + sign_x * kOffset * kScale, 29 kAnchor.y() + sign_y * kOffset * kScale), 30 test); 31 } 32 } 33 } 34 35 TEST(TransformUtilTest, SnapRotation) { 36 Transform result(Transform::kSkipInitialization); 37 Transform transform; 38 transform.RotateAboutZAxis(89.99); 39 40 Rect viewport(1920, 1200); 41 bool snapped = SnapTransform(&result, transform, viewport); 42 43 EXPECT_TRUE(snapped) << "Viewport should snap for this rotation."; 44 } 45 46 TEST(TransformUtilTest, SnapRotationDistantViewport) { 47 const int kOffset = 5000; 48 Transform result(Transform::kSkipInitialization); 49 Transform transform; 50 51 transform.RotateAboutZAxis(89.99); 52 53 Rect viewport(kOffset, kOffset, 1920, 1200); 54 bool snapped = SnapTransform(&result, transform, viewport); 55 56 EXPECT_FALSE(snapped) << "Distant viewport shouldn't snap by more than 1px."; 57 } 58 59 TEST(TransformUtilTest, NoSnapRotation) { 60 Transform result(Transform::kSkipInitialization); 61 Transform transform; 62 const int kOffset = 5000; 63 64 transform.RotateAboutZAxis(89.9); 65 66 Rect viewport(kOffset, kOffset, 1920, 1200); 67 bool snapped = SnapTransform(&result, transform, viewport); 68 69 EXPECT_FALSE(snapped) << "Viewport should not snap for this rotation."; 70 } 71 72 // Translations should always be snappable, the most we would move is 0.5 73 // pixels towards either direction to the nearest value in each component. 74 TEST(TransformUtilTest, SnapTranslation) { 75 Transform result(Transform::kSkipInitialization); 76 Transform transform; 77 78 transform.Translate3d( 79 SkDoubleToMScalar(1.01), SkDoubleToMScalar(1.99), SkDoubleToMScalar(3.0)); 80 81 Rect viewport(1920, 1200); 82 bool snapped = SnapTransform(&result, transform, viewport); 83 84 EXPECT_TRUE(snapped) << "Viewport should snap for this translation."; 85 } 86 87 TEST(TransformUtilTest, SnapTranslationDistantViewport) { 88 Transform result(Transform::kSkipInitialization); 89 Transform transform; 90 const int kOffset = 5000; 91 92 transform.Translate3d( 93 SkDoubleToMScalar(1.01), SkDoubleToMScalar(1.99), SkDoubleToMScalar(3.0)); 94 95 Rect viewport(kOffset, kOffset, 1920, 1200); 96 bool snapped = SnapTransform(&result, transform, viewport); 97 98 EXPECT_TRUE(snapped) 99 << "Distant viewport should still snap by less than 1px."; 100 } 101 102 TEST(TransformUtilTest, SnapScale) { 103 Transform result(Transform::kSkipInitialization); 104 Transform transform; 105 106 transform.Scale3d(SkDoubleToMScalar(5.0), 107 SkDoubleToMScalar(2.00001), 108 SkDoubleToMScalar(1.0)); 109 Rect viewport(1920, 1200); 110 bool snapped = SnapTransform(&result, transform, viewport); 111 112 EXPECT_TRUE(snapped) << "Viewport should snap for this scaling."; 113 } 114 115 TEST(TransformUtilTest, NoSnapScale) { 116 Transform result(Transform::kSkipInitialization); 117 Transform transform; 118 119 transform.Scale3d( 120 SkDoubleToMScalar(5.0), SkDoubleToMScalar(2.1), SkDoubleToMScalar(1.0)); 121 Rect viewport(1920, 1200); 122 bool snapped = SnapTransform(&result, transform, viewport); 123 124 EXPECT_FALSE(snapped) << "Viewport shouldn't snap for this scaling."; 125 } 126 127 TEST(TransformUtilTest, SnapCompositeTransform) { 128 Transform result(Transform::kSkipInitialization); 129 Transform transform; 130 131 transform.Translate3d(SkDoubleToMScalar(30.5), SkDoubleToMScalar(20.0), 132 SkDoubleToMScalar(10.1)); 133 transform.RotateAboutZAxis(89.99); 134 transform.Scale3d(SkDoubleToMScalar(1.0), 135 SkDoubleToMScalar(3.00001), 136 SkDoubleToMScalar(2.0)); 137 138 Rect viewport(1920, 1200); 139 bool snapped = SnapTransform(&result, transform, viewport); 140 ASSERT_TRUE(snapped) << "Viewport should snap all components."; 141 142 Point3F point; 143 144 point = Point3F(viewport.origin()); 145 result.TransformPoint(&point); 146 EXPECT_EQ(Point3F(31.f, 20.f, 10.f), point) << "Transformed origin"; 147 148 point = Point3F(viewport.top_right()); 149 result.TransformPoint(&point); 150 EXPECT_EQ(Point3F(31.f, 1940.f, 10.f), point) << "Transformed top-right"; 151 152 point = Point3F(viewport.bottom_left()); 153 result.TransformPoint(&point); 154 EXPECT_EQ(Point3F(-3569.f, 20.f, 10.f), point) << "Transformed bottom-left"; 155 156 point = Point3F(viewport.bottom_right()); 157 result.TransformPoint(&point); 158 EXPECT_EQ(Point3F(-3569.f, 1940.f, 10.f), point) 159 << "Transformed bottom-right"; 160 } 161 162 TEST(TransformUtilTest, NoSnapSkewedCompositeTransform) { 163 Transform result(Transform::kSkipInitialization); 164 Transform transform; 165 166 167 transform.RotateAboutZAxis(89.99); 168 transform.Scale3d(SkDoubleToMScalar(1.0), 169 SkDoubleToMScalar(3.00001), 170 SkDoubleToMScalar(2.0)); 171 transform.Translate3d(SkDoubleToMScalar(30.5), SkDoubleToMScalar(20.0), 172 SkDoubleToMScalar(10.1)); 173 transform.SkewX(20.0); 174 Rect viewport(1920, 1200); 175 bool snapped = SnapTransform(&result, transform, viewport); 176 EXPECT_FALSE(snapped) << "Skewed viewport should not snap."; 177 } 178 179 } // namespace 180 } // namespace gfx 181
