ui/gfx/transform_util_unittest.cc

   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/geometry/point.h"
   9 #include "ui/gfx/geometry/point3_f.h"
  10 #include "ui/gfx/geometry/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 TEST(TransformUtilTest, TransformAboutPivot) {
 180   Transform transform;
 181   transform.Scale(3, 4);
 182   transform = TransformAboutPivot(Point(7, 8), transform);
 183
 184   Point point;
 185
 186   point = Point(0, 0);
 187   transform.TransformPoint(&point);
 188   EXPECT_EQ(Point(-14, -24).ToString(), point.ToString());
 189
 190   point = Point(1, 1);
 191   transform.TransformPoint(&point);
 192   EXPECT_EQ(Point(-11, -20).ToString(), point.ToString());
 193 }
 194
 195 TEST(TransformUtilTest, MatrixDistance) {
 196   Transform a;
 197   Transform b(0, 1, 1, 1,
 198               1, 0, 1, 1,
 199               1, 1, 0, 1,
 200               1, 1, 1, 0);
 201   // Each entry in |a| should be 1 away from the corresponding entry in |b|.
 202   // This means the matrix distance should be sqrt(num_entries) = 4.
 203   EXPECT_EQ(4, MatrixDistance(a, b));
 204
 205   Transform c = b;
 206   EXPECT_EQ(0, MatrixDistance(b, c));
 207 }
 208
 209 }  // namespace
 210 }  // namespace gfx