src/ui/gfx/image/image_skia_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/image/image_skia.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "base/threading/simple_thread.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11 #include "third_party/skia/include/core/SkBitmap.h"
  12 #include "ui/gfx/image/image_skia_rep.h"
  13 #include "ui/gfx/image/image_skia_source.h"
  14 #include "ui/gfx/size.h"
  15 #include "ui/gfx/switches.h"
  16
  17 // Duplicated from base/threading/non_thread_safe.h so that we can be
  18 // good citizens there and undef the macro.
  19 #if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
  20 #define ENABLE_NON_THREAD_SAFE 1
  21 #else
  22 #define ENABLE_NON_THREAD_SAFE 0
  23 #endif
  24
  25 namespace gfx {
  26
  27 namespace {
  28
  29 class FixedSource : public ImageSkiaSource {
  30  public:
  31   FixedSource(const ImageSkiaRep& image) : image_(image) {}
  32
  33   virtual ~FixedSource() {
  34   }
  35
  36   virtual ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
  37     return image_;
  38   }
  39
  40  private:
  41   ImageSkiaRep image_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(FixedSource);
  44 };
  45
  46 class DynamicSource : public ImageSkiaSource {
  47  public:
  48   DynamicSource(const gfx::Size& size)
  49       : size_(size),
  50         last_requested_scale_(0.0f) {}
  51
  52   virtual ~DynamicSource() {
  53   }
  54
  55   virtual ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
  56     last_requested_scale_ = scale;
  57     return gfx::ImageSkiaRep(size_, scale);
  58   }
  59
  60   float GetLastRequestedScaleAndReset() {
  61     float result = last_requested_scale_;
  62     last_requested_scale_ = 0.0f;
  63     return result;
  64   }
  65
  66  private:
  67   gfx::Size size_;
  68   float last_requested_scale_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(DynamicSource);
  71 };
  72
  73 class NullSource: public ImageSkiaSource {
  74  public:
  75   NullSource() {
  76   }
  77
  78   virtual ~NullSource() {
  79   }
  80
  81   virtual ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
  82     return gfx::ImageSkiaRep();
  83   }
  84
  85  private:
  86   DISALLOW_COPY_AND_ASSIGN(NullSource);
  87 };
  88
  89 }  // namespace
  90
  91 namespace test {
  92 class TestOnThread : public base::SimpleThread {
  93  public:
  94   explicit TestOnThread(ImageSkia* image_skia)
  95       : SimpleThread("image_skia_on_thread"),
  96         image_skia_(image_skia),
  97         can_read_(false),
  98         can_modify_(false) {
  99   }
 100
 101   virtual void Run() OVERRIDE {
 102     can_read_ = image_skia_->CanRead();
 103     can_modify_ = image_skia_->CanModify();
 104     if (can_read_)
 105       image_skia_->image_reps();
 106   }
 107
 108   void StartAndJoin() {
 109     Start();
 110     Join();
 111   }
 112
 113   bool can_read() const { return can_read_; }
 114
 115   bool can_modify() const { return can_modify_; }
 116
 117  private:
 118   ImageSkia* image_skia_;
 119
 120   bool can_read_;
 121   bool can_modify_;
 122
 123   DISALLOW_COPY_AND_ASSIGN(TestOnThread);
 124 };
 125
 126 }  // namespace test
 127
 128 class ImageSkiaTest : public testing::Test {
 129  public:
 130   ImageSkiaTest() {
 131     // In the test, we assume that we support 1.0f and 2.0f DSFs.
 132     old_scales_ = ImageSkia::GetSupportedScales();
 133
 134     // Sets the list of scale factors supported by resource bundle.
 135     std::vector<float> supported_scales;
 136     supported_scales.push_back(1.0f);
 137     supported_scales.push_back(2.0f);
 138     ImageSkia::SetSupportedScales(supported_scales);
 139   }
 140   virtual ~ImageSkiaTest() {
 141     ImageSkia::SetSupportedScales(old_scales_);
 142   }
 143
 144  private:
 145   std::vector<float> old_scales_;
 146   DISALLOW_COPY_AND_ASSIGN(ImageSkiaTest);
 147 };
 148
 149 TEST_F(ImageSkiaTest, FixedSource) {
 150   ImageSkiaRep image(Size(100, 200), 1.0f);
 151   ImageSkia image_skia(new FixedSource(image), Size(100, 200));
 152   EXPECT_EQ(0U, image_skia.image_reps().size());
 153
 154   const ImageSkiaRep& result_100p = image_skia.GetRepresentation(1.0f);
 155   EXPECT_EQ(100, result_100p.GetWidth());
 156   EXPECT_EQ(200, result_100p.GetHeight());
 157   EXPECT_EQ(1.0f, result_100p.scale());
 158   EXPECT_EQ(1U, image_skia.image_reps().size());
 159
 160   const ImageSkiaRep& result_200p = image_skia.GetRepresentation(2.0f);
 161
 162   EXPECT_EQ(100, result_200p.GetWidth());
 163   EXPECT_EQ(200, result_200p.GetHeight());
 164   EXPECT_EQ(100, result_200p.pixel_width());
 165   EXPECT_EQ(200, result_200p.pixel_height());
 166   EXPECT_EQ(1.0f, result_200p.scale());
 167   EXPECT_EQ(1U, image_skia.image_reps().size());
 168
 169   // Get the representation again and make sure it doesn't
 170   // generate new image skia rep.
 171   image_skia.GetRepresentation(1.0f);
 172   image_skia.GetRepresentation(2.0f);
 173   EXPECT_EQ(1U, image_skia.image_reps().size());
 174 }
 175
 176 TEST_F(ImageSkiaTest, DynamicSource) {
 177   ImageSkia image_skia(new DynamicSource(Size(100, 200)), Size(100, 200));
 178   EXPECT_EQ(0U, image_skia.image_reps().size());
 179   const ImageSkiaRep& result_100p = image_skia.GetRepresentation(1.0f);
 180   EXPECT_EQ(100, result_100p.GetWidth());
 181   EXPECT_EQ(200, result_100p.GetHeight());
 182   EXPECT_EQ(1.0f, result_100p.scale());
 183   EXPECT_EQ(1U, image_skia.image_reps().size());
 184
 185   const ImageSkiaRep& result_200p =
 186       image_skia.GetRepresentation(2.0f);
 187   EXPECT_EQ(100, result_200p.GetWidth());
 188   EXPECT_EQ(200, result_200p.GetHeight());
 189   EXPECT_EQ(200, result_200p.pixel_width());
 190   EXPECT_EQ(400, result_200p.pixel_height());
 191   EXPECT_EQ(2.0f, result_200p.scale());
 192   EXPECT_EQ(2U, image_skia.image_reps().size());
 193
 194   // Get the representation again and make sure it doesn't
 195   // generate new image skia rep.
 196   image_skia.GetRepresentation(1.0f);
 197   EXPECT_EQ(2U, image_skia.image_reps().size());
 198   image_skia.GetRepresentation(2.0f);
 199   EXPECT_EQ(2U, image_skia.image_reps().size());
 200 }
 201
 202 // Tests that image_reps returns all of the representations in the
 203 // image when there are multiple representations for a scale factor.
 204 // This currently is the case with ImageLoader::LoadImages.
 205 TEST_F(ImageSkiaTest, ManyRepsPerScaleFactor) {
 206   const int kSmallIcon1x = 16;
 207   const int kSmallIcon2x = 32;
 208   const int kLargeIcon1x = 32;
 209
 210   ImageSkia image(new NullSource(), gfx::Size(kSmallIcon1x, kSmallIcon1x));
 211   // Simulate a source which loads images on a delay. Upon
 212   // GetImageForScaleFactor, it immediately returns null and starts loading
 213   // image reps slowly.
 214   image.GetRepresentation(1.0f);
 215   image.GetRepresentation(2.0f);
 216
 217   // After a lengthy amount of simulated time, finally loaded image reps.
 218   image.AddRepresentation(ImageSkiaRep(
 219       gfx::Size(kSmallIcon1x, kSmallIcon1x), 1.0f));
 220   image.AddRepresentation(ImageSkiaRep(
 221       gfx::Size(kSmallIcon2x, kSmallIcon2x), 2.0f));
 222   image.AddRepresentation(ImageSkiaRep(
 223       gfx::Size(kLargeIcon1x, kLargeIcon1x), 1.0f));
 224
 225   std::vector<ImageSkiaRep> image_reps = image.image_reps();
 226   EXPECT_EQ(3u, image_reps.size());
 227
 228   int num_1x = 0;
 229   int num_2x = 0;
 230   for (size_t i = 0; i < image_reps.size(); ++i) {
 231     if (image_reps[i].scale() == 1.0f)
 232       num_1x++;
 233     else if (image_reps[i].scale() == 2.0f)
 234       num_2x++;
 235   }
 236   EXPECT_EQ(2, num_1x);
 237   EXPECT_EQ(1, num_2x);
 238 }
 239
 240 TEST_F(ImageSkiaTest, GetBitmap) {
 241   ImageSkia image_skia(new DynamicSource(Size(100, 200)), Size(100, 200));
 242   const SkBitmap* bitmap = image_skia.bitmap();
 243   EXPECT_NE(static_cast<SkBitmap*>(NULL), bitmap);
 244   EXPECT_FALSE(bitmap->isNull());
 245 }
 246
 247 TEST_F(ImageSkiaTest, GetBitmapFromEmpty) {
 248   // Create an image with 1 representation and remove it so the ImageSkiaStorage
 249   // is left with no representations.
 250   ImageSkia empty_image(ImageSkiaRep(Size(100, 200), 1.0f));
 251   ImageSkia empty_image_copy(empty_image);
 252   empty_image.RemoveRepresentation(1.0f);
 253
 254   // Check that ImageSkia::bitmap() still returns a valid SkBitmap pointer for
 255   // the image and all its copies.
 256   const SkBitmap* bitmap = empty_image_copy.bitmap();
 257   ASSERT_NE(static_cast<SkBitmap*>(NULL), bitmap);
 258   EXPECT_TRUE(bitmap->isNull());
 259   EXPECT_TRUE(bitmap->empty());
 260 }
 261
 262 TEST_F(ImageSkiaTest, BackedBySameObjectAs) {
 263   // Null images should all be backed by the same object (NULL).
 264   ImageSkia image;
 265   ImageSkia unrelated;
 266   EXPECT_TRUE(image.BackedBySameObjectAs(unrelated));
 267
 268   image.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
 269                                             1.0f));
 270   ImageSkia copy = image;
 271   copy.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
 272                                            2.0f));
 273   unrelated.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
 274                                                 1.0f));
 275   EXPECT_TRUE(image.BackedBySameObjectAs(copy));
 276   EXPECT_FALSE(image.BackedBySameObjectAs(unrelated));
 277   EXPECT_FALSE(copy.BackedBySameObjectAs(unrelated));
 278 }
 279
 280 #if ENABLE_NON_THREAD_SAFE
 281 TEST_F(ImageSkiaTest, EmptyOnThreadTest) {
 282   ImageSkia empty;
 283   test::TestOnThread empty_on_thread(&empty);
 284   empty_on_thread.Start();
 285   empty_on_thread.Join();
 286   EXPECT_TRUE(empty_on_thread.can_read());
 287   EXPECT_TRUE(empty_on_thread.can_modify());
 288 }
 289
 290 TEST_F(ImageSkiaTest, StaticOnThreadTest) {
 291   ImageSkia image(ImageSkiaRep(Size(100, 200), 1.0f));
 292   EXPECT_FALSE(image.IsThreadSafe());
 293
 294   test::TestOnThread image_on_thread(&image);
 295   // an image that was never accessed on this thread can be
 296   // read by other thread.
 297   image_on_thread.StartAndJoin();
 298   EXPECT_TRUE(image_on_thread.can_read());
 299   EXPECT_TRUE(image_on_thread.can_modify());
 300   EXPECT_FALSE(image.CanRead());
 301   EXPECT_FALSE(image.CanModify());
 302
 303   image.DetachStorageFromThread();
 304   // An image is accessed by this thread,
 305   // so other thread cannot read/modify it.
 306   image.image_reps();
 307   test::TestOnThread image_on_thread2(&image);
 308   image_on_thread2.StartAndJoin();
 309   EXPECT_FALSE(image_on_thread2.can_read());
 310   EXPECT_FALSE(image_on_thread2.can_modify());
 311   EXPECT_TRUE(image.CanRead());
 312   EXPECT_TRUE(image.CanModify());
 313
 314   image.DetachStorageFromThread();
 315   scoped_ptr<ImageSkia> deep_copy(image.DeepCopy());
 316   EXPECT_FALSE(deep_copy->IsThreadSafe());
 317   test::TestOnThread deepcopy_on_thread(deep_copy.get());
 318   deepcopy_on_thread.StartAndJoin();
 319   EXPECT_TRUE(deepcopy_on_thread.can_read());
 320   EXPECT_TRUE(deepcopy_on_thread.can_modify());
 321   EXPECT_FALSE(deep_copy->CanRead());
 322   EXPECT_FALSE(deep_copy->CanModify());
 323
 324   scoped_ptr<ImageSkia> deep_copy2(image.DeepCopy());
 325   EXPECT_EQ(1U, deep_copy2->image_reps().size());
 326   // Access it from current thread so that it can't be
 327   // accessed from another thread.
 328   deep_copy2->image_reps();
 329   EXPECT_FALSE(deep_copy2->IsThreadSafe());
 330   test::TestOnThread deepcopy2_on_thread(deep_copy2.get());
 331   deepcopy2_on_thread.StartAndJoin();
 332   EXPECT_FALSE(deepcopy2_on_thread.can_read());
 333   EXPECT_FALSE(deepcopy2_on_thread.can_modify());
 334   EXPECT_TRUE(deep_copy2->CanRead());
 335   EXPECT_TRUE(deep_copy2->CanModify());
 336
 337   image.DetachStorageFromThread();
 338   image.SetReadOnly();
 339   // A read-only ImageSkia with no source is thread safe.
 340   EXPECT_TRUE(image.IsThreadSafe());
 341   test::TestOnThread readonly_on_thread(&image);
 342   readonly_on_thread.StartAndJoin();
 343   EXPECT_TRUE(readonly_on_thread.can_read());
 344   EXPECT_FALSE(readonly_on_thread.can_modify());
 345   EXPECT_TRUE(image.CanRead());
 346   EXPECT_FALSE(image.CanModify());
 347
 348   image.DetachStorageFromThread();
 349   image.MakeThreadSafe();
 350   EXPECT_TRUE(image.IsThreadSafe());
 351   test::TestOnThread threadsafe_on_thread(&image);
 352   threadsafe_on_thread.StartAndJoin();
 353   EXPECT_TRUE(threadsafe_on_thread.can_read());
 354   EXPECT_FALSE(threadsafe_on_thread.can_modify());
 355   EXPECT_TRUE(image.CanRead());
 356   EXPECT_FALSE(image.CanModify());
 357 }
 358
 359 TEST_F(ImageSkiaTest, SourceOnThreadTest) {
 360   ImageSkia image(new DynamicSource(Size(100, 200)), Size(100, 200));
 361   EXPECT_FALSE(image.IsThreadSafe());
 362
 363   test::TestOnThread image_on_thread(&image);
 364   image_on_thread.StartAndJoin();
 365   // an image that was never accessed on this thread can be
 366   // read by other thread.
 367   EXPECT_TRUE(image_on_thread.can_read());
 368   EXPECT_TRUE(image_on_thread.can_modify());
 369   EXPECT_FALSE(image.CanRead());
 370   EXPECT_FALSE(image.CanModify());
 371
 372   image.DetachStorageFromThread();
 373   // An image is accessed by this thread,
 374   // so other thread cannot read/modify it.
 375   image.image_reps();
 376   test::TestOnThread image_on_thread2(&image);
 377   image_on_thread2.StartAndJoin();
 378   EXPECT_FALSE(image_on_thread2.can_read());
 379   EXPECT_FALSE(image_on_thread2.can_modify());
 380   EXPECT_TRUE(image.CanRead());
 381   EXPECT_TRUE(image.CanModify());
 382
 383   image.DetachStorageFromThread();
 384   image.SetReadOnly();
 385   EXPECT_FALSE(image.IsThreadSafe());
 386   test::TestOnThread readonly_on_thread(&image);
 387   readonly_on_thread.StartAndJoin();
 388   EXPECT_TRUE(readonly_on_thread.can_read());
 389   EXPECT_FALSE(readonly_on_thread.can_modify());
 390   EXPECT_FALSE(image.CanRead());
 391   EXPECT_FALSE(image.CanModify());
 392
 393   image.DetachStorageFromThread();
 394   image.MakeThreadSafe();
 395   EXPECT_TRUE(image.IsThreadSafe());
 396   // Check if image reps are generated for supported scale factors.
 397   EXPECT_EQ(ImageSkia::GetSupportedScales().size(),
 398            image.image_reps().size());
 399   test::TestOnThread threadsafe_on_thread(&image);
 400   threadsafe_on_thread.StartAndJoin();
 401   EXPECT_TRUE(threadsafe_on_thread.can_read());
 402   EXPECT_FALSE(threadsafe_on_thread.can_modify());
 403   EXPECT_TRUE(image.CanRead());
 404   EXPECT_FALSE(image.CanModify());
 405 }
 406 #endif  // ENABLE_NON_THREAD_SAFE
 407
 408 // Just in case we ever get lumped together with other compilation units.
 409 #undef ENABLE_NON_THREAD_SAFE
 410
 411 TEST_F(ImageSkiaTest, Unscaled) {
 412   SkBitmap bitmap;
 413
 414   // An ImageSkia created with 1x bitmap is unscaled.
 415   ImageSkia image_skia = ImageSkia::CreateFrom1xBitmap(bitmap);
 416   EXPECT_TRUE(image_skia.GetRepresentation(1.0f).unscaled());
 417   ImageSkiaRep rep_2x(Size(100, 100), 2.0f);
 418
 419   // When reps for other scales are added, the unscaled image
 420   // becomes scaled.
 421   image_skia.AddRepresentation(rep_2x);
 422   EXPECT_FALSE(image_skia.GetRepresentation(1.0f).unscaled());
 423   EXPECT_FALSE(image_skia.GetRepresentation(2.0f).unscaled());
 424 }
 425
 426 namespace {
 427
 428 std::vector<float> GetSortedScaleFactors(const gfx::ImageSkia& image) {
 429   const std::vector<ImageSkiaRep>& image_reps = image.image_reps();
 430   std::vector<float> scale_factors;
 431   for (size_t i = 0; i < image_reps.size(); ++i) {
 432     scale_factors.push_back(image_reps[i].scale());
 433   }
 434   std::sort(scale_factors.begin(), scale_factors.end());
 435   return scale_factors;
 436 }
 437
 438 }  // namespace
 439
 440 TEST_F(ImageSkiaTest, ArbitraryScaleFactor) {
 441   // Do not test if the ImageSkia doesn't support arbitrary scale factors.
 442   if (!ImageSkia::IsDSFScalingInImageSkiaEnabled())
 443     return;
 444
 445   // source is owned by |image|
 446   DynamicSource* source = new DynamicSource(Size(100, 200));
 447   ImageSkia image(source, gfx::Size(100, 200));
 448
 449   image.GetRepresentation(1.5f);
 450   EXPECT_EQ(2.0f, source->GetLastRequestedScaleAndReset());
 451   std::vector<ImageSkiaRep> image_reps = image.image_reps();
 452   EXPECT_EQ(2u, image_reps.size());
 453
 454   std::vector<float> scale_factors = GetSortedScaleFactors(image);
 455   EXPECT_EQ(1.5f, scale_factors[0]);
 456   EXPECT_EQ(2.0f, scale_factors[1]);
 457
 458   // Requesting 1.75 scale factor also falls back to 2.0f and rescale.
 459   // However, the image already has the 2.0f data, so it won't fetch again.
 460   image.GetRepresentation(1.75f);
 461   EXPECT_EQ(0.0f, source->GetLastRequestedScaleAndReset());
 462   image_reps = image.image_reps();
 463   EXPECT_EQ(3u, image_reps.size());
 464
 465   scale_factors = GetSortedScaleFactors(image);
 466   EXPECT_EQ(1.5f, scale_factors[0]);
 467   EXPECT_EQ(1.75f, scale_factors[1]);
 468   EXPECT_EQ(2.0f, scale_factors[2]);
 469
 470   // Requesting 1.25 scale factor also falls back to 2.0f and rescale.
 471   // However, the image already has the 2.0f data, so it won't fetch again.
 472   image.GetRepresentation(1.25f);
 473   EXPECT_EQ(0.0f, source->GetLastRequestedScaleAndReset());
 474   image_reps = image.image_reps();
 475   EXPECT_EQ(4u, image_reps.size());
 476   scale_factors = GetSortedScaleFactors(image);
 477   EXPECT_EQ(1.25f, scale_factors[0]);
 478   EXPECT_EQ(1.5f, scale_factors[1]);
 479   EXPECT_EQ(1.75f, scale_factors[2]);
 480   EXPECT_EQ(2.0f, scale_factors[3]);
 481
 482   // 1.20 is falled back to 1.0.
 483   image.GetRepresentation(1.20f);
 484   EXPECT_EQ(1.0f, source->GetLastRequestedScaleAndReset());
 485   image_reps = image.image_reps();
 486   EXPECT_EQ(6u, image_reps.size());
 487   scale_factors = GetSortedScaleFactors(image);
 488   EXPECT_EQ(1.0f, scale_factors[0]);
 489   EXPECT_EQ(1.2f, scale_factors[1]);
 490   EXPECT_EQ(1.25f, scale_factors[2]);
 491   EXPECT_EQ(1.5f, scale_factors[3]);
 492   EXPECT_EQ(1.75f, scale_factors[4]);
 493   EXPECT_EQ(2.0f, scale_factors[5]);
 494
 495   // Scale factor less than 1.0f will be falled back to 1.0f
 496   image.GetRepresentation(0.75f);
 497   EXPECT_EQ(0.0f, source->GetLastRequestedScaleAndReset());
 498   image_reps = image.image_reps();
 499   EXPECT_EQ(7u, image_reps.size());
 500
 501   scale_factors = GetSortedScaleFactors(image);
 502   EXPECT_EQ(0.75f, scale_factors[0]);
 503   EXPECT_EQ(1.0f, scale_factors[1]);
 504   EXPECT_EQ(1.2f, scale_factors[2]);
 505   EXPECT_EQ(1.25f, scale_factors[3]);
 506   EXPECT_EQ(1.5f, scale_factors[4]);
 507   EXPECT_EQ(1.75f, scale_factors[5]);
 508   EXPECT_EQ(2.0f, scale_factors[6]);
 509
 510   // Scale factor greater than 2.0f is falled back to 2.0f because it's not
 511   // supported.
 512   image.GetRepresentation(3.0f);
 513   EXPECT_EQ(0.0f, source->GetLastRequestedScaleAndReset());
 514   image_reps = image.image_reps();
 515   EXPECT_EQ(8u, image_reps.size());
 516 }
 517
 518 TEST_F(ImageSkiaTest, ArbitraryScaleFactorWithMissingResource) {
 519   // Do not test if the ImageSkia doesn't support arbitrary scale factors.
 520   if (!ImageSkia::IsDSFScalingInImageSkiaEnabled())
 521     return;
 522
 523   ImageSkia image(new FixedSource(
 524       ImageSkiaRep(Size(100, 200), 1.0f)), Size(100, 200));
 525
 526   // Requesting 1.5f -- falls back to 2.0f, but couldn't find. It should
 527   // look up 1.0f and then rescale it.
 528   const ImageSkiaRep& rep = image.GetRepresentation(1.5f);
 529   EXPECT_EQ(1.5f, rep.scale());
 530   EXPECT_EQ(2U, image.image_reps().size());
 531   EXPECT_EQ(1.0f, image.image_reps()[0].scale());
 532   EXPECT_EQ(1.5f, image.image_reps()[1].scale());
 533 }
 534
 535 TEST_F(ImageSkiaTest, UnscaledImageForArbitraryScaleFactor) {
 536   // Do not test if the ImageSkia doesn't support arbitrary scale factors.
 537   if (!ImageSkia::IsDSFScalingInImageSkiaEnabled())
 538     return;
 539
 540   // 0.0f means unscaled.
 541   ImageSkia image(new FixedSource(
 542       ImageSkiaRep(Size(100, 200), 0.0f)), Size(100, 200));
 543
 544   // Requesting 2.0f, which should return 1.0f unscaled image.
 545   const ImageSkiaRep& rep = image.GetRepresentation(2.0f);
 546   EXPECT_EQ(1.0f, rep.scale());
 547   EXPECT_EQ("100x200", rep.pixel_size().ToString());
 548   EXPECT_TRUE(rep.unscaled());
 549   EXPECT_EQ(1U, image.image_reps().size());
 550
 551   // Same for any other scale factors.
 552   const ImageSkiaRep& rep15 = image.GetRepresentation(1.5f);
 553   EXPECT_EQ(1.0f, rep15.scale());
 554   EXPECT_EQ("100x200", rep15.pixel_size().ToString());
 555   EXPECT_TRUE(rep15.unscaled());
 556   EXPECT_EQ(1U, image.image_reps().size());
 557
 558   const ImageSkiaRep& rep12 = image.GetRepresentation(1.2f);
 559   EXPECT_EQ(1.0f, rep12.scale());
 560   EXPECT_EQ("100x200", rep12.pixel_size().ToString());
 561   EXPECT_TRUE(rep12.unscaled());
 562   EXPECT_EQ(1U, image.image_reps().size());
 563 }
 564
 565 }  // namespace gfx