remoting/host/resizing_host_observer_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 <list>
   6
   7 #include "base/compiler_specific.h"
   8 #include "base/logging.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/run_loop.h"
  12 #include "remoting/host/desktop_resizer.h"
  13 #include "remoting/host/resizing_host_observer.h"
  14 #include "remoting/host/screen_resolution.h"
  15 #include "testing/gtest/include/gtest/gtest.h"
  16 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  17
  18 namespace remoting {
  19
  20 std::ostream& operator<<(std::ostream& os, const ScreenResolution& resolution) {
  21   return os << resolution.dimensions().width() << "x"
  22             << resolution.dimensions().height() << " @ "
  23             << resolution.dpi().x() << "x" << resolution.dpi().y();
  24 }
  25
  26 bool operator==(const ScreenResolution& a, const ScreenResolution& b) {
  27   return a.Equals(b);
  28 }
  29
  30 const int kDefaultDPI = 96;
  31
  32 ScreenResolution MakeResolution(int width, int height) {
  33   return ScreenResolution(webrtc::DesktopSize(width, height),
  34                           webrtc::DesktopVector(kDefaultDPI, kDefaultDPI));
  35 }
  36
  37 class FakeDesktopResizer : public DesktopResizer {
  38  public:
  39   FakeDesktopResizer(const ScreenResolution& initial_resolution,
  40                      bool exact_size_supported,
  41                      const ScreenResolution* supported_resolutions,
  42                      int num_supported_resolutions,
  43                      int* restore_resolution_call_count)
  44       : initial_resolution_(initial_resolution),
  45         current_resolution_(initial_resolution),
  46         exact_size_supported_(exact_size_supported),
  47         set_resolution_call_count_(0),
  48         restore_resolution_call_count_(restore_resolution_call_count) {
  49     for (int i = 0; i < num_supported_resolutions; ++i) {
  50       supported_resolutions_.push_back(supported_resolutions[i]);
  51     }
  52   }
  53
  54   virtual ~FakeDesktopResizer() {
  55     EXPECT_EQ(initial_resolution_, GetCurrentResolution());
  56   }
  57
  58   int set_resolution_call_count() { return set_resolution_call_count_; }
  59
  60   // remoting::DesktopResizer interface
  61   virtual ScreenResolution GetCurrentResolution() override {
  62     return current_resolution_;
  63   }
  64   virtual std::list<ScreenResolution> GetSupportedResolutions(
  65       const ScreenResolution& preferred) override {
  66     std::list<ScreenResolution> result = supported_resolutions_;
  67     if (exact_size_supported_) {
  68       result.push_back(preferred);
  69     }
  70     return result;
  71   }
  72   virtual void SetResolution(const ScreenResolution& resolution) override {
  73     current_resolution_ = resolution;
  74     ++set_resolution_call_count_;
  75   }
  76   virtual void RestoreResolution(const ScreenResolution& resolution) override {
  77     current_resolution_ = resolution;
  78     if (restore_resolution_call_count_)
  79       ++(*restore_resolution_call_count_);
  80   }
  81
  82  private:
  83   ScreenResolution initial_resolution_;
  84   ScreenResolution current_resolution_;
  85   bool exact_size_supported_;
  86   std::list<ScreenResolution> supported_resolutions_;
  87
  88   int set_resolution_call_count_;
  89   int* restore_resolution_call_count_;
  90 };
  91
  92 class ResizingHostObserverTest : public testing::Test {
  93  public:
  94   ResizingHostObserverTest()
  95       : desktop_resizer_(NULL),
  96         now_(base::Time::Now()) {
  97   }
  98
  99   // This needs to be public because the derived test-case class needs to
 100   // pass it to Bind, which fails if it's protected.
 101   base::Time GetTime() {
 102     return now_;
 103   }
 104
 105  protected:
 106   void SetDesktopResizer(scoped_ptr<FakeDesktopResizer> desktop_resizer) {
 107     CHECK(!desktop_resizer_) << "Call SetDeskopResizer once per test";
 108     desktop_resizer_ = desktop_resizer.get();
 109
 110     resizing_host_observer_.reset(
 111         new ResizingHostObserver(desktop_resizer.Pass()));
 112     resizing_host_observer_->SetNowFunctionForTesting(
 113         base::Bind(&ResizingHostObserverTest::GetTimeAndIncrement,
 114                    base::Unretained(this)));
 115   }
 116
 117   ScreenResolution GetBestResolution(const ScreenResolution& client_size) {
 118     resizing_host_observer_->SetScreenResolution(client_size);
 119     return desktop_resizer_->GetCurrentResolution();
 120   }
 121
 122   void VerifySizes(const ScreenResolution* client_sizes,
 123                    const ScreenResolution* expected_sizes,
 124                    int number_of_sizes) {
 125     for (int i = 0; i < number_of_sizes; ++i) {
 126       ScreenResolution best_size = GetBestResolution(client_sizes[i]);
 127       EXPECT_EQ(expected_sizes[i], best_size)
 128           << "Input resolution = " << client_sizes[i];
 129     }
 130   }
 131
 132   base::Time GetTimeAndIncrement() {
 133     base::Time result = now_;
 134     now_ += base::TimeDelta::FromSeconds(1);
 135     return result;
 136   }
 137
 138   scoped_ptr<ResizingHostObserver> resizing_host_observer_;
 139   FakeDesktopResizer* desktop_resizer_;
 140   base::Time now_;
 141 };
 142
 143 // Check that the resolution isn't restored if it wasn't changed by this class.
 144 TEST_F(ResizingHostObserverTest, NoRestoreResolution) {
 145   int restore_resolution_call_count = 0;
 146   ScreenResolution initial = MakeResolution(640, 480);
 147   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 148       new FakeDesktopResizer(initial, false, NULL, 0,
 149                              &restore_resolution_call_count));
 150   SetDesktopResizer(desktop_resizer.Pass());
 151   VerifySizes(NULL, NULL, 0);
 152   resizing_host_observer_.reset();
 153   EXPECT_EQ(0, restore_resolution_call_count);
 154 }
 155
 156 // Check that the host is not resized if GetSupportedSizes returns an empty
 157 // list (even if GetCurrentSize is supported).
 158 TEST_F(ResizingHostObserverTest, EmptyGetSupportedSizes) {
 159   int restore_resolution_call_count = 0;
 160   ScreenResolution initial = MakeResolution(640, 480);
 161   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 162       new FakeDesktopResizer(initial, false, NULL, 0,
 163                              &restore_resolution_call_count));
 164   SetDesktopResizer(desktop_resizer.Pass());
 165
 166   ScreenResolution client_sizes[] = { MakeResolution(200, 100),
 167                                       MakeResolution(100, 200) };
 168   ScreenResolution expected_sizes[] = { initial, initial };
 169   VerifySizes(client_sizes, expected_sizes, arraysize(client_sizes));
 170
 171   resizing_host_observer_.reset();
 172   EXPECT_EQ(0, restore_resolution_call_count);
 173 }
 174
 175 // Check that if the implementation supports exact size matching, it is used.
 176 TEST_F(ResizingHostObserverTest, SelectExactSize) {
 177   int restore_resolution_call_count = 0;
 178   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 179         new FakeDesktopResizer(MakeResolution(640, 480), true, NULL, 0,
 180                                &restore_resolution_call_count));
 181   SetDesktopResizer(desktop_resizer.Pass());
 182
 183   ScreenResolution client_sizes[] = { MakeResolution(200, 100),
 184                                       MakeResolution(100, 200),
 185                                       MakeResolution(640, 480),
 186                                       MakeResolution(480, 640),
 187                                       MakeResolution(1280, 1024) };
 188   VerifySizes(client_sizes, client_sizes, arraysize(client_sizes));
 189   resizing_host_observer_.reset();
 190   EXPECT_EQ(1, restore_resolution_call_count);
 191 }
 192
 193 // Check that if the implementation supports a size that is no larger than
 194 // the requested size, then the largest such size is used.
 195 TEST_F(ResizingHostObserverTest, SelectBestSmallerSize) {
 196   ScreenResolution supported_sizes[] = { MakeResolution(639, 479),
 197                                          MakeResolution(640, 480) };
 198   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 199       new FakeDesktopResizer(MakeResolution(640, 480), false,
 200                              supported_sizes, arraysize(supported_sizes),
 201                              NULL));
 202   SetDesktopResizer(desktop_resizer.Pass());
 203
 204   ScreenResolution client_sizes[] = { MakeResolution(639, 479),
 205                                       MakeResolution(640, 480),
 206                                       MakeResolution(641, 481),
 207                                       MakeResolution(999, 999) };
 208   ScreenResolution expected_sizes[] = { supported_sizes[0], supported_sizes[1],
 209                                supported_sizes[1], supported_sizes[1] };
 210   VerifySizes(client_sizes, expected_sizes, arraysize(client_sizes));
 211 }
 212
 213 // Check that if the implementation supports only sizes that are larger than
 214 // the requested size, then the one that requires the least down-scaling.
 215 TEST_F(ResizingHostObserverTest, SelectBestScaleFactor) {
 216   ScreenResolution supported_sizes[] = { MakeResolution(100, 100),
 217                                          MakeResolution(200, 100) };
 218   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 219       new FakeDesktopResizer(MakeResolution(200, 100), false,
 220                              supported_sizes, arraysize(supported_sizes),
 221                              NULL));
 222   SetDesktopResizer(desktop_resizer.Pass());
 223
 224   ScreenResolution client_sizes[] = { MakeResolution(1, 1),
 225                                       MakeResolution(99, 99),
 226                                       MakeResolution(199, 99) };
 227   ScreenResolution expected_sizes[] = { supported_sizes[0], supported_sizes[0],
 228                                supported_sizes[1] };
 229   VerifySizes(client_sizes, expected_sizes, arraysize(client_sizes));
 230 }
 231
 232 // Check that if the implementation supports two sizes that have the same
 233 // resultant scale factor, then the widest one is selected.
 234 TEST_F(ResizingHostObserverTest, SelectWidest) {
 235   ScreenResolution supported_sizes[] = { MakeResolution(640, 480),
 236                                          MakeResolution(480, 640) };
 237   scoped_ptr<FakeDesktopResizer> desktop_resizer(
 238       new FakeDesktopResizer(MakeResolution(480, 640), false,
 239                              supported_sizes, arraysize(supported_sizes),
 240                              NULL));
 241   SetDesktopResizer(desktop_resizer.Pass());
 242
 243   ScreenResolution client_sizes[] = { MakeResolution(100, 100),
 244                                       MakeResolution(480, 480),
 245                                       MakeResolution(500, 500),
 246                                       MakeResolution(640, 640),
 247                                       MakeResolution(1000, 1000) };
 248   ScreenResolution expected_sizes[] = { supported_sizes[0], supported_sizes[0],
 249                                supported_sizes[0], supported_sizes[0],
 250                                supported_sizes[0] };
 251   VerifySizes(client_sizes, expected_sizes, arraysize(client_sizes));
 252 }
 253
 254 // Check that if the best match for the client size doesn't change, then we
 255 // don't call SetSize.
 256 TEST_F(ResizingHostObserverTest, NoSetSizeForSameSize) {
 257   ScreenResolution supported_sizes[] = { MakeResolution(640, 480),
 258                                          MakeResolution(480, 640) };
 259   SetDesktopResizer(make_scoped_ptr(new FakeDesktopResizer(
 260       MakeResolution(480, 640), false,
 261       supported_sizes, arraysize(supported_sizes), NULL)));
 262
 263   ScreenResolution client_sizes[] = { MakeResolution(640, 640),
 264                                       MakeResolution(1024, 768),
 265                                       MakeResolution(640, 480) };
 266   ScreenResolution expected_sizes[] = { MakeResolution(640, 480),
 267                                         MakeResolution(640, 480),
 268                                         MakeResolution(640, 480) };
 269   VerifySizes(client_sizes, expected_sizes, arraysize(client_sizes));
 270   EXPECT_EQ(desktop_resizer_->set_resolution_call_count(), 1);
 271 }
 272
 273 // Check that desktop resizes are rate-limited, and that if multiple resize
 274 // requests are received in the time-out period, the most recent is respected.
 275 TEST_F(ResizingHostObserverTest, RateLimited) {
 276   SetDesktopResizer(make_scoped_ptr(
 277       new FakeDesktopResizer(MakeResolution(640, 480), true, NULL, 0, NULL)));
 278   resizing_host_observer_->SetNowFunctionForTesting(
 279       base::Bind(&ResizingHostObserverTest::GetTime, base::Unretained(this)));
 280
 281   base::MessageLoop message_loop;
 282   base::RunLoop run_loop;
 283
 284   EXPECT_EQ(GetBestResolution(MakeResolution(100, 100)),
 285             MakeResolution(100, 100));
 286   now_ += base::TimeDelta::FromMilliseconds(900);
 287   EXPECT_EQ(GetBestResolution(MakeResolution(200, 200)),
 288             MakeResolution(100, 100));
 289   now_ += base::TimeDelta::FromMilliseconds(99);
 290   EXPECT_EQ(GetBestResolution(MakeResolution(300, 300)),
 291             MakeResolution(100, 100));
 292   now_ += base::TimeDelta::FromMilliseconds(1);
 293
 294   // Due to the kMinimumResizeIntervalMs constant in resizing_host_observer.cc,
 295   // We need to wait a total of 1000ms for the final resize to be processed.
 296   // Since it was queued 900 + 99 ms after the first, we need to wait an
 297   // additional 1ms. However, since RunLoop is not guaranteed to process tasks
 298   // with the same due time in FIFO order, wait an additional 1ms for safety.
 299   message_loop.PostDelayedTask(
 300       FROM_HERE,
 301       run_loop.QuitClosure(),
 302       base::TimeDelta::FromMilliseconds(2));
 303   run_loop.Run();
 304
 305   // If the QuitClosure fired before the final resize, it's a test failure.
 306   EXPECT_EQ(desktop_resizer_->GetCurrentResolution(), MakeResolution(300, 300));
 307 }
 308
 309 }  // namespace remoting