ui/base/resource/resource_bundle.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/base/resource/resource_bundle.h"
   6
   7 #include <limits>
   8 #include <vector>
   9
  10 #include "base/big_endian.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file.h"
  13 #include "base/files/file_util.h"
  14 #include "base/logging.h"
  15 #include "base/memory/ref_counted_memory.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/path_service.h"
  18 #include "base/stl_util.h"
  19 #include "base/strings/string_piece.h"
  20 #include "base/strings/utf_string_conversions.h"
  21 #include "base/synchronization/lock.h"
  22 #include "build/build_config.h"
  23 #include "skia/ext/image_operations.h"
  24 #include "third_party/skia/include/core/SkBitmap.h"
  25 #include "ui/base/l10n/l10n_util.h"
  26 #include "ui/base/layout.h"
  27 #include "ui/base/resource/data_pack.h"
  28 #include "ui/base/ui_base_paths.h"
  29 #include "ui/base/ui_base_switches.h"
  30 #include "ui/gfx/codec/jpeg_codec.h"
  31 #include "ui/gfx/codec/png_codec.h"
  32 #include "ui/gfx/geometry/safe_integer_conversions.h"
  33 #include "ui/gfx/geometry/size_conversions.h"
  34 #include "ui/gfx/image/image_skia.h"
  35 #include "ui/gfx/image/image_skia_source.h"
  36 #include "ui/gfx/screen.h"
  37 #include "ui/strings/grit/app_locale_settings.h"
  38
  39 #if defined(OS_ANDROID)
  40 #include "ui/base/resource/resource_bundle_android.h"
  41 #endif
  42
  43 #if defined(OS_CHROMEOS)
  44 #include "ui/gfx/platform_font_linux.h"
  45 #endif
  46
  47 #if defined(OS_WIN)
  48 #include "ui/gfx/win/dpi.h"
  49 #endif
  50
  51 #if defined(OS_MACOSX) && !defined(OS_IOS)
  52 #include "base/mac/mac_util.h"
  53 #endif
  54
  55 namespace ui {
  56
  57 namespace {
  58
  59 // Font sizes relative to base font.
  60 const int kSmallFontSizeDelta = -1;
  61 const int kMediumFontSizeDelta = 3;
  62 const int kLargeFontSizeDelta = 8;
  63
  64 // PNG-related constants.
  65 const unsigned char kPngMagic[8] = { 0x89, 'P', 'N', 'G', 13, 10, 26, 10 };
  66 const size_t kPngChunkMetadataSize = 12;  // length, type, crc32
  67 const unsigned char kPngScaleChunkType[4] = { 'c', 's', 'C', 'l' };
  68 const unsigned char kPngDataChunkType[4] = { 'I', 'D', 'A', 'T' };
  69
  70 #if !defined(OS_MACOSX)
  71 const char kPakFileSuffix[] = ".pak";
  72 #endif
  73
  74 ResourceBundle* g_shared_instance_ = NULL;
  75
  76 #if defined(OS_ANDROID)
  77 // Returns the scale factor closest to |scale| from the full list of factors.
  78 // Note that it does NOT rely on the list of supported scale factors.
  79 // Finding the closest match is inefficient and shouldn't be done frequently.
  80 ScaleFactor FindClosestScaleFactorUnsafe(float scale) {
  81   float smallest_diff =  std::numeric_limits<float>::max();
  82   ScaleFactor closest_match = SCALE_FACTOR_100P;
  83   for (int i = SCALE_FACTOR_100P; i < NUM_SCALE_FACTORS; ++i) {
  84     const ScaleFactor scale_factor = static_cast<ScaleFactor>(i);
  85     float diff = std::abs(GetScaleForScaleFactor(scale_factor) - scale);
  86     if (diff < smallest_diff) {
  87       closest_match = scale_factor;
  88       smallest_diff = diff;
  89     }
  90   }
  91   return closest_match;
  92 }
  93 #endif  // OS_ANDROID
  94
  95 }  // namespace
  96
  97 // An ImageSkiaSource that loads bitmaps for the requested scale factor from
  98 // ResourceBundle on demand for a given |resource_id|. If the bitmap for the
  99 // requested scale factor does not exist, it will return the 1x bitmap scaled
 100 // by the scale factor. This may lead to broken UI if the correct size of the
 101 // scaled image is not exactly |scale_factor| * the size of the 1x resource.
 102 // When --highlight-missing-scaled-resources flag is specified, scaled 1x images
 103 // are higlighted by blending them with red.
 104 class ResourceBundle::ResourceBundleImageSource : public gfx::ImageSkiaSource {
 105  public:
 106   ResourceBundleImageSource(ResourceBundle* rb, int resource_id)
 107       : rb_(rb), resource_id_(resource_id) {}
 108   ~ResourceBundleImageSource() override {}
 109
 110   // gfx::ImageSkiaSource overrides:
 111   gfx::ImageSkiaRep GetImageForScale(float scale) override {
 112     SkBitmap image;
 113     bool fell_back_to_1x = false;
 114     ScaleFactor scale_factor = GetSupportedScaleFactor(scale);
 115     bool found = rb_->LoadBitmap(resource_id_, &scale_factor,
 116                                  &image, &fell_back_to_1x);
 117     if (!found)
 118       return gfx::ImageSkiaRep();
 119
 120     // If the resource is in the package with SCALE_FACTOR_NONE, it
 121     // can be used in any scale factor. The image is maked as "unscaled"
 122     // so that the ImageSkia do not automatically scale.
 123     if (scale_factor == ui::SCALE_FACTOR_NONE)
 124       return gfx::ImageSkiaRep(image, 0.0f);
 125
 126     if (fell_back_to_1x) {
 127       // GRIT fell back to the 100% image, so rescale it to the correct size.
 128       image = skia::ImageOperations::Resize(
 129           image,
 130           skia::ImageOperations::RESIZE_LANCZOS3,
 131           gfx::ToCeiledInt(image.width() * scale),
 132           gfx::ToCeiledInt(image.height() * scale));
 133     } else {
 134       scale = GetScaleForScaleFactor(scale_factor);
 135     }
 136     return gfx::ImageSkiaRep(image, scale);
 137   }
 138
 139  private:
 140   ResourceBundle* rb_;
 141   const int resource_id_;
 142
 143   DISALLOW_COPY_AND_ASSIGN(ResourceBundleImageSource);
 144 };
 145
 146 // static
 147 std::string ResourceBundle::InitSharedInstanceWithLocale(
 148     const std::string& pref_locale,
 149     Delegate* delegate,
 150     LoadResources load_resources) {
 151   InitSharedInstance(delegate);
 152   if (load_resources == LOAD_COMMON_RESOURCES)
 153     g_shared_instance_->LoadCommonResources();
 154   std::string result = g_shared_instance_->LoadLocaleResources(pref_locale);
 155   g_shared_instance_->InitDefaultFontList();
 156   return result;
 157 }
 158
 159 // static
 160 void ResourceBundle::InitSharedInstanceWithPakFileRegion(
 161     base::File pak_file,
 162     const base::MemoryMappedFile::Region& region) {
 163   InitSharedInstance(NULL);
 164   scoped_ptr<DataPack> data_pack(new DataPack(SCALE_FACTOR_100P));
 165   if (!data_pack->LoadFromFileRegion(pak_file.Pass(), region)) {
 166     NOTREACHED() << "failed to load pak file";
 167     return;
 168   }
 169   g_shared_instance_->locale_resources_data_.reset(data_pack.release());
 170   g_shared_instance_->InitDefaultFontList();
 171 }
 172
 173 // static
 174 void ResourceBundle::InitSharedInstanceWithPakPath(const base::FilePath& path) {
 175   InitSharedInstance(NULL);
 176   g_shared_instance_->LoadTestResources(path, path);
 177
 178   g_shared_instance_->InitDefaultFontList();
 179 }
 180
 181 // static
 182 void ResourceBundle::CleanupSharedInstance() {
 183   if (g_shared_instance_) {
 184     delete g_shared_instance_;
 185     g_shared_instance_ = NULL;
 186   }
 187 }
 188
 189 // static
 190 bool ResourceBundle::HasSharedInstance() {
 191   return g_shared_instance_ != NULL;
 192 }
 193
 194 // static
 195 ResourceBundle& ResourceBundle::GetSharedInstance() {
 196   // Must call InitSharedInstance before this function.
 197   CHECK(g_shared_instance_ != NULL);
 198   return *g_shared_instance_;
 199 }
 200
 201 bool ResourceBundle::LocaleDataPakExists(const std::string& locale) {
 202   bool locale_file_path_exists = !GetLocaleFilePath(locale, true).empty();
 203 #if defined(OS_ANDROID)
 204   // TODO(mkosiba,primiano): Chrome should mmap the .pak files too, in which
 205   // case we'd not need to check if locale_file_path_exists here.
 206   // http://crbug.com/394502.
 207   return locale_file_path_exists ||
 208       AssetContainedInApk(locale + kPakFileSuffix);
 209 #else
 210   return locale_file_path_exists;
 211 #endif
 212 }
 213
 214 void ResourceBundle::AddDataPackFromPath(const base::FilePath& path,
 215                                          ScaleFactor scale_factor) {
 216   AddDataPackFromPathInternal(path, scale_factor, false);
 217 }
 218
 219 void ResourceBundle::AddOptionalDataPackFromPath(const base::FilePath& path,
 220                                          ScaleFactor scale_factor) {
 221   AddDataPackFromPathInternal(path, scale_factor, true);
 222 }
 223
 224 void ResourceBundle::AddDataPackFromFile(base::File file,
 225                                          ScaleFactor scale_factor) {
 226   AddDataPackFromFileRegion(
 227       file.Pass(), base::MemoryMappedFile::Region::kWholeFile, scale_factor);
 228 }
 229
 230 void ResourceBundle::AddDataPackFromFileRegion(
 231     base::File file,
 232     const base::MemoryMappedFile::Region& region,
 233     ScaleFactor scale_factor) {
 234   scoped_ptr<DataPack> data_pack(
 235       new DataPack(scale_factor));
 236   if (data_pack->LoadFromFileRegion(file.Pass(), region)) {
 237     AddDataPack(data_pack.release());
 238   } else {
 239     LOG(ERROR) << "Failed to load data pack from file."
 240                << "\nSome features may not be available.";
 241   }
 242 }
 243
 244 #if !defined(OS_MACOSX)
 245 base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
 246                                                  bool test_file_exists) {
 247   if (app_locale.empty())
 248     return base::FilePath();
 249
 250   base::FilePath locale_file_path;
 251
 252   PathService::Get(ui::DIR_LOCALES, &locale_file_path);
 253
 254   if (!locale_file_path.empty()) {
 255     locale_file_path =
 256         locale_file_path.AppendASCII(app_locale + kPakFileSuffix);
 257   }
 258
 259   if (delegate_) {
 260     locale_file_path =
 261         delegate_->GetPathForLocalePack(locale_file_path, app_locale);
 262   }
 263
 264   // Don't try to load empty values or values that are not absolute paths.
 265   if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
 266     return base::FilePath();
 267
 268   if (test_file_exists && !base::PathExists(locale_file_path))
 269     return base::FilePath();
 270
 271   return locale_file_path;
 272 }
 273 #endif
 274
 275 std::string ResourceBundle::LoadLocaleResources(
 276     const std::string& pref_locale) {
 277   DCHECK(!locale_resources_data_.get()) << "locale.pak already loaded";
 278   std::string app_locale = l10n_util::GetApplicationLocale(pref_locale);
 279   base::FilePath locale_file_path = GetOverriddenPakPath();
 280   if (locale_file_path.empty())
 281     locale_file_path = GetLocaleFilePath(app_locale, true);
 282
 283   if (locale_file_path.empty()) {
 284     // It's possible that there is no locale.pak.
 285     LOG(WARNING) << "locale_file_path.empty()";
 286     return std::string();
 287   }
 288
 289   scoped_ptr<DataPack> data_pack(
 290       new DataPack(SCALE_FACTOR_100P));
 291   if (!data_pack->LoadFromPath(locale_file_path)) {
 292     UMA_HISTOGRAM_ENUMERATION("ResourceBundle.LoadLocaleResourcesError",
 293                               logging::GetLastSystemErrorCode(), 16000);
 294     LOG(ERROR) << "failed to load locale.pak";
 295     NOTREACHED();
 296     return std::string();
 297   }
 298
 299   locale_resources_data_.reset(data_pack.release());
 300   return app_locale;
 301 }
 302
 303 void ResourceBundle::LoadTestResources(const base::FilePath& path,
 304                                        const base::FilePath& locale_path) {
 305   DCHECK(!ui::GetSupportedScaleFactors().empty());
 306   const ScaleFactor scale_factor(ui::GetSupportedScaleFactors()[0]);
 307   // Use the given resource pak for both common and localized resources.
 308   scoped_ptr<DataPack> data_pack(new DataPack(scale_factor));
 309   if (!path.empty() && data_pack->LoadFromPath(path))
 310     AddDataPack(data_pack.release());
 311
 312   data_pack.reset(new DataPack(ui::SCALE_FACTOR_NONE));
 313   if (!locale_path.empty() && data_pack->LoadFromPath(locale_path)) {
 314     locale_resources_data_.reset(data_pack.release());
 315   } else {
 316     locale_resources_data_.reset(new DataPack(ui::SCALE_FACTOR_NONE));
 317   }
 318 }
 319
 320 void ResourceBundle::UnloadLocaleResources() {
 321   locale_resources_data_.reset();
 322 }
 323
 324 void ResourceBundle::OverrideLocalePakForTest(const base::FilePath& pak_path) {
 325   overridden_pak_path_ = pak_path;
 326 }
 327
 328 void ResourceBundle::OverrideLocaleStringResource(
 329     int message_id,
 330     const base::string16& string) {
 331   overridden_locale_strings_[message_id] = string;
 332 }
 333
 334 const base::FilePath& ResourceBundle::GetOverriddenPakPath() {
 335   return overridden_pak_path_;
 336 }
 337
 338 std::string ResourceBundle::ReloadLocaleResources(
 339     const std::string& pref_locale) {
 340   base::AutoLock lock_scope(*locale_resources_data_lock_);
 341
 342   // Remove all overriden strings, as they will not be valid for the new locale.
 343   overridden_locale_strings_.clear();
 344
 345   UnloadLocaleResources();
 346   return LoadLocaleResources(pref_locale);
 347 }
 348
 349 gfx::ImageSkia* ResourceBundle::GetImageSkiaNamed(int resource_id) {
 350   const gfx::ImageSkia* image = GetImageNamed(resource_id).ToImageSkia();
 351   return const_cast<gfx::ImageSkia*>(image);
 352 }
 353
 354 gfx::Image& ResourceBundle::GetImageNamed(int resource_id) {
 355   // Check to see if the image is already in the cache.
 356   {
 357     base::AutoLock lock_scope(*images_and_fonts_lock_);
 358     if (images_.count(resource_id))
 359       return images_[resource_id];
 360   }
 361
 362   gfx::Image image;
 363   if (delegate_)
 364     image = delegate_->GetImageNamed(resource_id);
 365
 366   if (image.IsEmpty()) {
 367     DCHECK(!data_packs_.empty()) <<
 368         "Missing call to SetResourcesDataDLL?";
 369
 370 #if defined(OS_CHROMEOS) || defined(OS_WIN)
 371   ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
 372 #else
 373   ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
 374 #endif
 375
 376     // TODO(oshima): Consider reading the image size from png IHDR chunk and
 377     // skip decoding here and remove #ifdef below.
 378     // ResourceBundle::GetSharedInstance() is destroyed after the
 379     // BrowserMainLoop has finished running. |image_skia| is guaranteed to be
 380     // destroyed before the resource bundle is destroyed.
 381     gfx::ImageSkia image_skia(new ResourceBundleImageSource(this, resource_id),
 382                               GetScaleForScaleFactor(scale_factor_to_load));
 383     if (image_skia.isNull()) {
 384       LOG(WARNING) << "Unable to load image with id " << resource_id;
 385       NOTREACHED();  // Want to assert in debug mode.
 386       // The load failed to retrieve the image; show a debugging red square.
 387       return GetEmptyImage();
 388     }
 389     image_skia.SetReadOnly();
 390     image = gfx::Image(image_skia);
 391   }
 392
 393   // The load was successful, so cache the image.
 394   base::AutoLock lock_scope(*images_and_fonts_lock_);
 395
 396   // Another thread raced the load and has already cached the image.
 397   if (images_.count(resource_id))
 398     return images_[resource_id];
 399
 400   images_[resource_id] = image;
 401   return images_[resource_id];
 402 }
 403
 404 gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
 405   return GetNativeImageNamed(resource_id, RTL_DISABLED);
 406 }
 407
 408 base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytes(
 409     int resource_id) const {
 410   return LoadDataResourceBytesForScale(resource_id, ui::SCALE_FACTOR_NONE);
 411 }
 412
 413 base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytesForScale(
 414     int resource_id,
 415     ScaleFactor scale_factor) const {
 416   base::RefCountedStaticMemory* bytes = NULL;
 417   if (delegate_)
 418     bytes = delegate_->LoadDataResourceBytes(resource_id, scale_factor);
 419
 420   if (!bytes) {
 421     base::StringPiece data =
 422         GetRawDataResourceForScale(resource_id, scale_factor);
 423     if (!data.empty()) {
 424       bytes = new base::RefCountedStaticMemory(data.data(), data.length());
 425     }
 426   }
 427
 428   return bytes;
 429 }
 430
 431 base::StringPiece ResourceBundle::GetRawDataResource(int resource_id) const {
 432   return GetRawDataResourceForScale(resource_id, ui::SCALE_FACTOR_NONE);
 433 }
 434
 435 base::StringPiece ResourceBundle::GetRawDataResourceForScale(
 436     int resource_id,
 437     ScaleFactor scale_factor) const {
 438   base::StringPiece data;
 439   if (delegate_ &&
 440       delegate_->GetRawDataResource(resource_id, scale_factor, &data))
 441     return data;
 442
 443   if (scale_factor != ui::SCALE_FACTOR_100P) {
 444     for (size_t i = 0; i < data_packs_.size(); i++) {
 445       if (data_packs_[i]->GetScaleFactor() == scale_factor &&
 446           data_packs_[i]->GetStringPiece(static_cast<uint16>(resource_id),
 447                                          &data))
 448         return data;
 449     }
 450   }
 451
 452   for (size_t i = 0; i < data_packs_.size(); i++) {
 453     if ((data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P ||
 454          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_200P ||
 455          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_300P ||
 456          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE) &&
 457         data_packs_[i]->GetStringPiece(static_cast<uint16>(resource_id),
 458                                        &data))
 459       return data;
 460   }
 461
 462   return base::StringPiece();
 463 }
 464
 465 base::string16 ResourceBundle::GetLocalizedString(int message_id) {
 466   base::string16 string;
 467   if (delegate_ && delegate_->GetLocalizedString(message_id, &string))
 468     return string;
 469
 470   // Ensure that ReloadLocaleResources() doesn't drop the resources while
 471   // we're using them.
 472   base::AutoLock lock_scope(*locale_resources_data_lock_);
 473
 474   IdToStringMap::const_iterator it =
 475       overridden_locale_strings_.find(message_id);
 476   if (it != overridden_locale_strings_.end())
 477     return it->second;
 478
 479   // If for some reason we were unable to load the resources , return an empty
 480   // string (better than crashing).
 481   if (!locale_resources_data_.get()) {
 482     LOG(WARNING) << "locale resources are not loaded";
 483     return base::string16();
 484   }
 485
 486   base::StringPiece data;
 487   if (!locale_resources_data_->GetStringPiece(static_cast<uint16>(message_id),
 488                                               &data)) {
 489     // Fall back on the main data pack (shouldn't be any strings here except in
 490     // unittests).
 491     data = GetRawDataResource(message_id);
 492     if (data.empty()) {
 493       NOTREACHED() << "unable to find resource: " << message_id;
 494       return base::string16();
 495     }
 496   }
 497
 498   // Strings should not be loaded from a data pack that contains binary data.
 499   ResourceHandle::TextEncodingType encoding =
 500       locale_resources_data_->GetTextEncodingType();
 501   DCHECK(encoding == ResourceHandle::UTF16 || encoding == ResourceHandle::UTF8)
 502       << "requested localized string from binary pack file";
 503
 504   // Data pack encodes strings as either UTF8 or UTF16.
 505   base::string16 msg;
 506   if (encoding == ResourceHandle::UTF16) {
 507     msg = base::string16(reinterpret_cast<const base::char16*>(data.data()),
 508                          data.length() / 2);
 509   } else if (encoding == ResourceHandle::UTF8) {
 510     msg = base::UTF8ToUTF16(data);
 511   }
 512   return msg;
 513 }
 514
 515 const gfx::FontList& ResourceBundle::GetFontList(FontStyle style) {
 516   {
 517     base::AutoLock lock_scope(*images_and_fonts_lock_);
 518     LoadFontsIfNecessary();
 519   }
 520   switch (style) {
 521     case BoldFont:
 522       return *bold_font_list_;
 523     case SmallFont:
 524       return *small_font_list_;
 525     case MediumFont:
 526       return *medium_font_list_;
 527     case SmallBoldFont:
 528       return *small_bold_font_list_;
 529     case MediumBoldFont:
 530       return *medium_bold_font_list_;
 531     case LargeFont:
 532       return *large_font_list_;
 533     case LargeBoldFont:
 534       return *large_bold_font_list_;
 535     default:
 536       return *base_font_list_;
 537   }
 538 }
 539
 540 const gfx::Font& ResourceBundle::GetFont(FontStyle style) {
 541   return GetFontList(style).GetPrimaryFont();
 542 }
 543
 544 void ResourceBundle::ReloadFonts() {
 545   base::AutoLock lock_scope(*images_and_fonts_lock_);
 546   InitDefaultFontList();
 547   base_font_list_.reset();
 548   LoadFontsIfNecessary();
 549 }
 550
 551 ScaleFactor ResourceBundle::GetMaxScaleFactor() const {
 552 #if defined(OS_CHROMEOS) || defined(OS_WIN)
 553   return max_scale_factor_;
 554 #else
 555   return GetSupportedScaleFactors().back();
 556 #endif
 557 }
 558
 559 bool ResourceBundle::IsScaleFactorSupported(ScaleFactor scale_factor) {
 560   const std::vector<ScaleFactor>& supported_scale_factors =
 561       ui::GetSupportedScaleFactors();
 562   return std::find(supported_scale_factors.begin(),
 563                    supported_scale_factors.end(),
 564                    scale_factor) != supported_scale_factors.end();
 565 }
 566
 567 ResourceBundle::ResourceBundle(Delegate* delegate)
 568     : delegate_(delegate),
 569       images_and_fonts_lock_(new base::Lock),
 570       locale_resources_data_lock_(new base::Lock),
 571       max_scale_factor_(SCALE_FACTOR_100P) {
 572 }
 573
 574 ResourceBundle::~ResourceBundle() {
 575   FreeImages();
 576   UnloadLocaleResources();
 577 }
 578
 579 // static
 580 void ResourceBundle::InitSharedInstance(Delegate* delegate) {
 581   DCHECK(g_shared_instance_ == NULL) << "ResourceBundle initialized twice";
 582   g_shared_instance_ = new ResourceBundle(delegate);
 583   static std::vector<ScaleFactor> supported_scale_factors;
 584 #if !defined(OS_IOS) && !defined(OS_WIN)
 585   // On platforms other than iOS, 100P is always a supported scale factor.
 586   // For Windows we have a separate case in this function.
 587   supported_scale_factors.push_back(SCALE_FACTOR_100P);
 588 #endif
 589 #if defined(OS_ANDROID)
 590   const gfx::Display display =
 591       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
 592   const float display_density = display.device_scale_factor();
 593   const ScaleFactor closest = FindClosestScaleFactorUnsafe(display_density);
 594   if (closest != SCALE_FACTOR_100P)
 595     supported_scale_factors.push_back(closest);
 596 #elif defined(OS_IOS)
 597     gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
 598   if (display.device_scale_factor() > 2.0) {
 599     DCHECK_EQ(3.0, display.device_scale_factor());
 600     supported_scale_factors.push_back(SCALE_FACTOR_300P);
 601   } else if (display.device_scale_factor() > 1.0) {
 602     DCHECK_EQ(2.0, display.device_scale_factor());
 603     supported_scale_factors.push_back(SCALE_FACTOR_200P);
 604   } else {
 605     supported_scale_factors.push_back(SCALE_FACTOR_100P);
 606   }
 607 #elif defined(OS_MACOSX)
 608   if (base::mac::IsOSLionOrLater())
 609     supported_scale_factors.push_back(SCALE_FACTOR_200P);
 610 #elif defined(OS_CHROMEOS)
 611   // TODO(oshima): Include 200P only if the device support 200P
 612   supported_scale_factors.push_back(SCALE_FACTOR_200P);
 613 #elif defined(OS_LINUX) && defined(ENABLE_HIDPI)
 614   supported_scale_factors.push_back(SCALE_FACTOR_200P);
 615 #elif defined(OS_WIN)
 616   bool default_to_100P = true;
 617   // On Windows if the dpi scale is greater than 1.25 on high dpi machines
 618   // downscaling from 200 percent looks better than scaling up from 100
 619   // percent.
 620   if (gfx::GetDPIScale() > 1.25) {
 621     supported_scale_factors.push_back(SCALE_FACTOR_200P);
 622     default_to_100P = false;
 623   }
 624   if (default_to_100P)
 625     supported_scale_factors.push_back(SCALE_FACTOR_100P);
 626 #endif
 627   ui::SetSupportedScaleFactors(supported_scale_factors);
 628 #if defined(OS_WIN)
 629   // Must be called _after_ supported scale factors are set since it
 630   // uses them.
 631   gfx::InitDeviceScaleFactor(gfx::GetDPIScale());
 632 #endif
 633 }
 634
 635 void ResourceBundle::FreeImages() {
 636   images_.clear();
 637 }
 638
 639 void ResourceBundle::AddDataPackFromPathInternal(const base::FilePath& path,
 640                                                  ScaleFactor scale_factor,
 641                                                  bool optional) {
 642   // Do not pass an empty |path| value to this method. If the absolute path is
 643   // unknown pass just the pack file name.
 644   DCHECK(!path.empty());
 645
 646   base::FilePath pack_path = path;
 647   if (delegate_)
 648     pack_path = delegate_->GetPathForResourcePack(pack_path, scale_factor);
 649
 650   // Don't try to load empty values or values that are not absolute paths.
 651   if (pack_path.empty() || !pack_path.IsAbsolute())
 652     return;
 653
 654   scoped_ptr<DataPack> data_pack(
 655       new DataPack(scale_factor));
 656   if (data_pack->LoadFromPath(pack_path)) {
 657     AddDataPack(data_pack.release());
 658   } else if (!optional) {
 659     LOG(ERROR) << "Failed to load " << pack_path.value()
 660                << "\nSome features may not be available.";
 661   }
 662 }
 663
 664 void ResourceBundle::AddDataPack(DataPack* data_pack) {
 665 #if DCHECK_IS_ON()
 666   data_pack->CheckForDuplicateResources(data_packs_);
 667 #endif
 668   data_packs_.push_back(data_pack);
 669
 670   if (GetScaleForScaleFactor(data_pack->GetScaleFactor()) >
 671       GetScaleForScaleFactor(max_scale_factor_))
 672     max_scale_factor_ = data_pack->GetScaleFactor();
 673 }
 674
 675 void ResourceBundle::InitDefaultFontList() {
 676 #if defined(OS_CHROMEOS)
 677   std::string font_family = base::UTF16ToUTF8(
 678       GetLocalizedString(IDS_UI_FONT_FAMILY_CROS));
 679   gfx::FontList::SetDefaultFontDescription(font_family);
 680
 681   // TODO(yukishiino): Remove SetDefaultFontDescription() once the migration to
 682   // the font list is done.  We will no longer need SetDefaultFontDescription()
 683   // after every client gets started using a FontList instead of a Font.
 684   gfx::PlatformFontLinux::SetDefaultFontDescription(font_family);
 685 #else
 686   // Use a single default font as the default font list.
 687   gfx::FontList::SetDefaultFontDescription(std::string());
 688 #endif
 689 }
 690
 691 void ResourceBundle::LoadFontsIfNecessary() {
 692   images_and_fonts_lock_->AssertAcquired();
 693   if (!base_font_list_.get()) {
 694     if (delegate_) {
 695       base_font_list_ = GetFontListFromDelegate(BaseFont);
 696       bold_font_list_ = GetFontListFromDelegate(BoldFont);
 697       small_font_list_ = GetFontListFromDelegate(SmallFont);
 698       small_bold_font_list_ = GetFontListFromDelegate(SmallBoldFont);
 699       medium_font_list_ = GetFontListFromDelegate(MediumFont);
 700       medium_bold_font_list_ = GetFontListFromDelegate(MediumBoldFont);
 701       large_font_list_ = GetFontListFromDelegate(LargeFont);
 702       large_bold_font_list_ = GetFontListFromDelegate(LargeBoldFont);
 703     }
 704
 705     if (!base_font_list_.get())
 706       base_font_list_.reset(new gfx::FontList());
 707
 708     if (!bold_font_list_.get()) {
 709       bold_font_list_.reset(new gfx::FontList());
 710       *bold_font_list_ = base_font_list_->DeriveWithStyle(
 711           base_font_list_->GetFontStyle() | gfx::Font::BOLD);
 712     }
 713
 714     if (!small_font_list_.get()) {
 715       small_font_list_.reset(new gfx::FontList());
 716       *small_font_list_ =
 717           base_font_list_->DeriveWithSizeDelta(kSmallFontSizeDelta);
 718     }
 719
 720     if (!small_bold_font_list_.get()) {
 721       small_bold_font_list_.reset(new gfx::FontList());
 722       *small_bold_font_list_ = small_font_list_->DeriveWithStyle(
 723           small_font_list_->GetFontStyle() | gfx::Font::BOLD);
 724     }
 725
 726     if (!medium_font_list_.get()) {
 727       medium_font_list_.reset(new gfx::FontList());
 728       *medium_font_list_ =
 729           base_font_list_->DeriveWithSizeDelta(kMediumFontSizeDelta);
 730     }
 731
 732     if (!medium_bold_font_list_.get()) {
 733       medium_bold_font_list_.reset(new gfx::FontList());
 734       *medium_bold_font_list_ = medium_font_list_->DeriveWithStyle(
 735           medium_font_list_->GetFontStyle() | gfx::Font::BOLD);
 736     }
 737
 738     if (!large_font_list_.get()) {
 739       large_font_list_.reset(new gfx::FontList());
 740       *large_font_list_ =
 741           base_font_list_->DeriveWithSizeDelta(kLargeFontSizeDelta);
 742     }
 743
 744     if (!large_bold_font_list_.get()) {
 745       large_bold_font_list_.reset(new gfx::FontList());
 746       *large_bold_font_list_ = large_font_list_->DeriveWithStyle(
 747           large_font_list_->GetFontStyle() | gfx::Font::BOLD);
 748     }
 749   }
 750 }
 751
 752 scoped_ptr<gfx::FontList> ResourceBundle::GetFontListFromDelegate(
 753     FontStyle style) {
 754   DCHECK(delegate_);
 755   scoped_ptr<gfx::Font> font = delegate_->GetFont(style);
 756   if (font.get())
 757     return make_scoped_ptr(new gfx::FontList(*font));
 758   return nullptr;
 759 }
 760
 761 bool ResourceBundle::LoadBitmap(const ResourceHandle& data_handle,
 762                                 int resource_id,
 763                                 SkBitmap* bitmap,
 764                                 bool* fell_back_to_1x) const {
 765   DCHECK(fell_back_to_1x);
 766   scoped_refptr<base::RefCountedMemory> memory(
 767       data_handle.GetStaticMemory(static_cast<uint16>(resource_id)));
 768   if (!memory.get())
 769     return false;
 770
 771   if (DecodePNG(memory->front(), memory->size(), bitmap, fell_back_to_1x))
 772     return true;
 773
 774 #if !defined(OS_IOS)
 775   // iOS does not compile or use the JPEG codec.  On other platforms,
 776   // 99% of our assets are PNGs, however fallback to JPEG.
 777   scoped_ptr<SkBitmap> jpeg_bitmap(
 778       gfx::JPEGCodec::Decode(memory->front(), memory->size()));
 779   if (jpeg_bitmap.get()) {
 780     bitmap->swap(*jpeg_bitmap.get());
 781     *fell_back_to_1x = false;
 782     return true;
 783   }
 784 #endif
 785
 786   NOTREACHED() << "Unable to decode theme image resource " << resource_id;
 787   return false;
 788 }
 789
 790 bool ResourceBundle::LoadBitmap(int resource_id,
 791                                 ScaleFactor* scale_factor,
 792                                 SkBitmap* bitmap,
 793                                 bool* fell_back_to_1x) const {
 794   DCHECK(fell_back_to_1x);
 795   for (size_t i = 0; i < data_packs_.size(); ++i) {
 796     if (data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE &&
 797         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
 798       DCHECK(!*fell_back_to_1x);
 799       *scale_factor = ui::SCALE_FACTOR_NONE;
 800       return true;
 801     }
 802     if (data_packs_[i]->GetScaleFactor() == *scale_factor &&
 803         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
 804       return true;
 805     }
 806   }
 807   return false;
 808 }
 809
 810 gfx::Image& ResourceBundle::GetEmptyImage() {
 811   base::AutoLock lock(*images_and_fonts_lock_);
 812
 813   if (empty_image_.IsEmpty()) {
 814     // The placeholder bitmap is bright red so people notice the problem.
 815     SkBitmap bitmap;
 816     bitmap.allocN32Pixels(32, 32);
 817     bitmap.eraseARGB(255, 255, 0, 0);
 818     empty_image_ = gfx::Image::CreateFrom1xBitmap(bitmap);
 819   }
 820   return empty_image_;
 821 }
 822
 823 // static
 824 bool ResourceBundle::PNGContainsFallbackMarker(const unsigned char* buf,
 825                                                size_t size) {
 826   if (size < arraysize(kPngMagic) ||
 827       memcmp(buf, kPngMagic, arraysize(kPngMagic)) != 0) {
 828     // Data invalid or a JPEG.
 829     return false;
 830   }
 831   size_t pos = arraysize(kPngMagic);
 832
 833   // Scan for custom chunks until we find one, find the IDAT chunk, or run out
 834   // of chunks.
 835   for (;;) {
 836     if (size - pos < kPngChunkMetadataSize)
 837       break;
 838     uint32 length = 0;
 839     base::ReadBigEndian(reinterpret_cast<const char*>(buf + pos), &length);
 840     if (size - pos - kPngChunkMetadataSize < length)
 841       break;
 842     if (length == 0 && memcmp(buf + pos + sizeof(uint32), kPngScaleChunkType,
 843                               arraysize(kPngScaleChunkType)) == 0) {
 844       return true;
 845     }
 846     if (memcmp(buf + pos + sizeof(uint32), kPngDataChunkType,
 847                arraysize(kPngDataChunkType)) == 0) {
 848       // Stop looking for custom chunks, any custom chunks should be before an
 849       // IDAT chunk.
 850       break;
 851     }
 852     pos += length + kPngChunkMetadataSize;
 853   }
 854   return false;
 855 }
 856
 857 // static
 858 bool ResourceBundle::DecodePNG(const unsigned char* buf,
 859                                size_t size,
 860                                SkBitmap* bitmap,
 861                                bool* fell_back_to_1x) {
 862   *fell_back_to_1x = PNGContainsFallbackMarker(buf, size);
 863   return gfx::PNGCodec::Decode(buf, size, bitmap);
 864 }
 865
 866 }  // namespace ui