ui/gfx/interpolated_transform_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/interpolated_transform.h"
   6
   7 #include "base/basictypes.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9 #include "ui/gfx/rect.h"
  10
  11 namespace {
  12
  13 void CheckApproximatelyEqual(const gfx::Transform& lhs,
  14                              const gfx::Transform& rhs) {
  15   for (int i = 0; i < 4; ++i) {
  16     for (int j = 0; j < 4; ++j) {
  17       EXPECT_FLOAT_EQ(lhs.matrix().get(i, j), rhs.matrix().get(i, j));
  18     }
  19   }
  20 }
  21
  22 } // namespace
  23
  24 TEST(InterpolatedTransformTest, InterpolatedRotation) {
  25   ui::InterpolatedRotation interpolated_rotation(0, 100);
  26   ui::InterpolatedRotation interpolated_rotation_diff_start_end(
  27       0, 100, 100, 200);
  28
  29   for (int i = 0; i <= 100; ++i) {
  30     gfx::Transform rotation;
  31     rotation.Rotate(i);
  32     gfx::Transform interpolated = interpolated_rotation.Interpolate(i / 100.0f);
  33     CheckApproximatelyEqual(rotation, interpolated);
  34     interpolated = interpolated_rotation_diff_start_end.Interpolate(i + 100);
  35     CheckApproximatelyEqual(rotation, interpolated);
  36   }
  37 }
  38
  39 TEST(InterpolatedTransformTest, InterpolatedScale) {
  40   ui::InterpolatedScale interpolated_scale(gfx::Point3F(0, 0, 0),
  41                                            gfx::Point3F(100, 100, 100));
  42   ui::InterpolatedScale interpolated_scale_diff_start_end(
  43       gfx::Point3F(0, 0, 0), gfx::Point3F(100, 100, 100), 100, 200);
  44
  45   for (int i = 0; i <= 100; ++i) {
  46     gfx::Transform scale;
  47     scale.Scale(i, i);
  48     gfx::Transform interpolated = interpolated_scale.Interpolate(i / 100.0f);
  49     CheckApproximatelyEqual(scale, interpolated);
  50     interpolated = interpolated_scale_diff_start_end.Interpolate(i + 100);
  51     CheckApproximatelyEqual(scale, interpolated);
  52   }
  53 }
  54
  55 TEST(InterpolatedTransformTest, InterpolatedTranslate) {
  56   ui::InterpolatedTranslation interpolated_xform(gfx::Point(0, 0),
  57                                                  gfx::Point(100, 100));
  58
  59   ui::InterpolatedTranslation interpolated_xform_diff_start_end(
  60       gfx::Point(0, 0), gfx::Point(100, 100), 100, 200);
  61
  62   for (int i = 0; i <= 100; ++i) {
  63     gfx::Transform xform;
  64     xform.Translate(i, i);
  65     gfx::Transform interpolated = interpolated_xform.Interpolate(i / 100.0f);
  66     CheckApproximatelyEqual(xform, interpolated);
  67     interpolated = interpolated_xform_diff_start_end.Interpolate(i + 100);
  68     CheckApproximatelyEqual(xform, interpolated);
  69   }
  70 }
  71
  72 TEST(InterpolatedTransformTest, InterpolatedRotationAboutPivot) {
  73   gfx::Point pivot(100, 100);
  74   gfx::Point above_pivot(100, 200);
  75   ui::InterpolatedRotation rot(0, 90);
  76   ui::InterpolatedTransformAboutPivot interpolated_xform(
  77       pivot,
  78       new ui::InterpolatedRotation(0, 90));
  79   gfx::Transform result = interpolated_xform.Interpolate(0.0f);
  80   CheckApproximatelyEqual(gfx::Transform(), result);
  81   result = interpolated_xform.Interpolate(1.0f);
  82   gfx::Point expected_result = pivot;
  83   result.TransformPoint(&pivot);
  84   EXPECT_EQ(expected_result, pivot);
  85   expected_result = gfx::Point(0, 100);
  86   result.TransformPoint(&above_pivot);
  87   EXPECT_EQ(expected_result, above_pivot);
  88 }
  89
  90 TEST(InterpolatedTransformTest, InterpolatedScaleAboutPivot) {
  91   gfx::Point pivot(100, 100);
  92   gfx::Point above_pivot(100, 200);
  93   ui::InterpolatedTransformAboutPivot interpolated_xform(
  94       pivot,
  95       new ui::InterpolatedScale(gfx::Point3F(1, 1, 1), gfx::Point3F(2, 2, 2)));
  96   gfx::Transform result = interpolated_xform.Interpolate(0.0f);
  97   CheckApproximatelyEqual(gfx::Transform(), result);
  98   result = interpolated_xform.Interpolate(1.0f);
  99   gfx::Point expected_result = pivot;
 100   result.TransformPoint(&pivot);
 101   EXPECT_EQ(expected_result, pivot);
 102   expected_result = gfx::Point(100, 300);
 103   result.TransformPoint(&above_pivot);
 104   EXPECT_EQ(expected_result, above_pivot);
 105 }
 106
 107 ui::InterpolatedTransform* GetScreenRotation(int degrees, bool reversed) {
 108   gfx::Point old_pivot;
 109   gfx::Point new_pivot;
 110
 111   int width = 1920;
 112   int height = 180;
 113
 114   switch (degrees) {
 115     case 90:
 116       new_pivot = gfx::Point(width, 0);
 117       break;
 118     case -90:
 119       new_pivot = gfx::Point(0, height);
 120       break;
 121     case 180:
 122     case 360:
 123       new_pivot = old_pivot = gfx::Point(width / 2, height / 2);
 124       break;
 125   }
 126
 127   scoped_ptr<ui::InterpolatedTransform> rotation(
 128       new ui::InterpolatedTransformAboutPivot(
 129           old_pivot,
 130           new ui::InterpolatedRotation(reversed ? degrees : 0,
 131                                        reversed ? 0 : degrees)));
 132
 133   scoped_ptr<ui::InterpolatedTransform> translation(
 134       new ui::InterpolatedTranslation(
 135           gfx::Point(0, 0),
 136           gfx::Point(new_pivot.x() - old_pivot.x(),
 137                      new_pivot.y() - old_pivot.y())));
 138
 139   float scale_factor = 0.9f;
 140   scoped_ptr<ui::InterpolatedTransform> scale_down(
 141       new ui::InterpolatedScale(1.0f, scale_factor, 0.0f, 0.5f));
 142
 143   scoped_ptr<ui::InterpolatedTransform> scale_up(
 144       new ui::InterpolatedScale(1.0f, 1.0f / scale_factor, 0.5f, 1.0f));
 145
 146   scoped_ptr<ui::InterpolatedTransform> to_return(
 147       new ui::InterpolatedConstantTransform(gfx::Transform()));
 148
 149   scale_up->SetChild(scale_down.release());
 150   translation->SetChild(scale_up.release());
 151   rotation->SetChild(translation.release());
 152   to_return->SetChild(rotation.release());
 153   to_return->SetReversed(reversed);
 154
 155   return to_return.release();
 156 }
 157
 158 TEST(InterpolatedTransformTest, ScreenRotationEndsCleanly) {
 159   for (int i = 0; i < 2; ++i) {
 160     for (int degrees = -360; degrees <= 360; degrees += 90) {
 161       const bool reversed = i == 1;
 162       scoped_ptr<ui::InterpolatedTransform> screen_rotation(
 163           GetScreenRotation(degrees, reversed));
 164       gfx::Transform interpolated = screen_rotation->Interpolate(1.0f);
 165       SkMatrix44& m = interpolated.matrix();
 166       // Upper-left 3x3 matrix should all be 0, 1 or -1.
 167       for (int row = 0; row < 3; ++row) {
 168         for (int col = 0; col < 3; ++col) {
 169           float entry = m.get(row, col);
 170           EXPECT_TRUE(entry == 0 || entry == 1 || entry == -1);
 171         }
 172       }
 173     }
 174   }
 175 }
 176
 177 ui::InterpolatedTransform* GetMaximize() {
 178   gfx::Rect target_bounds(0, 0, 1920, 1080);
 179   gfx::Rect initial_bounds(30, 1000, 192, 108);
 180
 181   float scale_x = static_cast<float>(
 182       target_bounds.height()) / initial_bounds.width();
 183   float scale_y = static_cast<float>(
 184       target_bounds.width()) / initial_bounds.height();
 185
 186   scoped_ptr<ui::InterpolatedTransform> scale(
 187       new ui::InterpolatedScale(gfx::Point3F(1, 1, 1),
 188                                 gfx::Point3F(scale_x, scale_y, 1)));
 189
 190   scoped_ptr<ui::InterpolatedTransform> translation(
 191       new ui::InterpolatedTranslation(
 192           gfx::Point(),
 193           gfx::Point(target_bounds.x() - initial_bounds.x(),
 194                      target_bounds.y() - initial_bounds.y())));
 195
 196   scoped_ptr<ui::InterpolatedTransform> rotation(
 197       new ui::InterpolatedRotation(0, 4.0f));
 198
 199   scoped_ptr<ui::InterpolatedTransform> rotation_about_pivot(
 200       new ui::InterpolatedTransformAboutPivot(
 201           gfx::Point(initial_bounds.width() * 0.5,
 202                      initial_bounds.height() * 0.5),
 203           rotation.release()));
 204
 205   scale->SetChild(translation.release());
 206   rotation_about_pivot->SetChild(scale.release());
 207
 208   rotation_about_pivot->SetReversed(true);
 209
 210   return rotation_about_pivot.release();
 211 }
 212
 213 TEST(InterpolatedTransformTest, MaximizeEndsCleanly) {
 214   scoped_ptr<ui::InterpolatedTransform> maximize(GetMaximize());
 215   gfx::Transform interpolated = maximize->Interpolate(1.0f);
 216   SkMatrix44& m = interpolated.matrix();
 217   // Upper-left 3x3 matrix should all be 0, 1 or -1.
 218   for (int row = 0; row < 3; ++row) {
 219     for (int col = 0; col < 3; ++col) {
 220       float entry = m.get(row, col);
 221       EXPECT_TRUE(entry == 0 || entry == 1 || entry == -1);
 222     }
 223   }
 224 }