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 <vector>
   8
   9 #include "base/command_line.h"
  10 #include "base/file_util.h"
  11 #include "base/logging.h"
  12 #include "base/memory/ref_counted_memory.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/path_service.h"
  15 #include "base/stl_util.h"
  16 #include "base/strings/string_piece.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "base/synchronization/lock.h"
  19 #include "build/build_config.h"
  20 #include "grit/app_locale_settings.h"
  21 #include "net/base/big_endian.h"
  22 #include "skia/ext/image_operations.h"
  23 #include "third_party/skia/include/core/SkBitmap.h"
  24 #include "ui/base/l10n/l10n_util.h"
  25 #include "ui/base/layout.h"
  26 #include "ui/base/resource/data_pack.h"
  27 #include "ui/base/ui_base_paths.h"
  28 #include "ui/base/ui_base_switches.h"
  29 #include "ui/gfx/codec/jpeg_codec.h"
  30 #include "ui/gfx/codec/png_codec.h"
  31 #include "ui/gfx/image/image_skia.h"
  32 #include "ui/gfx/image/image_skia_source.h"
  33 #include "ui/gfx/safe_integer_conversions.h"
  34 #include "ui/gfx/screen.h"
  35 #include "ui/gfx/size_conversions.h"
  36 #include "ui/gfx/skbitmap_operations.h"
  37
  38 #if defined(OS_CHROMEOS)
  39 #include "ui/base/l10n/l10n_util.h"
  40 #include "ui/gfx/platform_font_pango.h"
  41 #endif
  42
  43 #if defined(OS_WIN)
  44 #include "ui/base/win/dpi_setup.h"
  45 #include "ui/gfx/win/dpi.h"
  46 #endif
  47
  48 #if defined(OS_MACOSX) && !defined(OS_IOS)
  49 #include "base/mac/mac_util.h"
  50 #endif
  51
  52 namespace ui {
  53
  54 namespace {
  55
  56 // Font sizes relative to base font.
  57 const int kSmallFontSizeDelta = -1;
  58 const int kMediumFontSizeDelta = 3;
  59 const int kLargeFontSizeDelta = 8;
  60
  61 // PNG-related constants.
  62 const unsigned char kPngMagic[8] = { 0x89, 'P', 'N', 'G', 13, 10, 26, 10 };
  63 const size_t kPngChunkMetadataSize = 12;  // length, type, crc32
  64 const unsigned char kPngScaleChunkType[4] = { 'c', 's', 'C', 'l' };
  65 const unsigned char kPngDataChunkType[4] = { 'I', 'D', 'A', 'T' };
  66
  67 ResourceBundle* g_shared_instance_ = NULL;
  68
  69 void InitDefaultFontList() {
  70 #if defined(OS_CHROMEOS)
  71   gfx::FontList::SetDefaultFontDescription(
  72       l10n_util::GetStringUTF8(IDS_UI_FONT_FAMILY_CROS));
  73
  74   // TODO(yukishiino): Remove SetDefaultFontDescription() once the migration to
  75   // the font list is done.  We will no longer need SetDefaultFontDescription()
  76   // after every client gets started using a FontList instead of a Font.
  77   gfx::PlatformFontPango::SetDefaultFontDescription(
  78       l10n_util::GetStringUTF8(IDS_UI_FONT_FAMILY_CROS));
  79 #else
  80   // Use a single default font as the default font list.
  81   gfx::FontList::SetDefaultFontDescription(std::string());
  82 #endif
  83 }
  84
  85 }  // namespace
  86
  87 // An ImageSkiaSource that loads bitmaps for the requested scale factor from
  88 // ResourceBundle on demand for a given |resource_id|. If the bitmap for the
  89 // requested scale factor does not exist, it will return the 1x bitmap scaled
  90 // by the scale factor. This may lead to broken UI if the correct size of the
  91 // scaled image is not exactly |scale_factor| * the size of the 1x resource.
  92 // When --highlight-missing-scaled-resources flag is specified, scaled 1x images
  93 // are higlighted by blending them with red.
  94 class ResourceBundle::ResourceBundleImageSource : public gfx::ImageSkiaSource {
  95  public:
  96   ResourceBundleImageSource(ResourceBundle* rb, int resource_id)
  97       : rb_(rb), resource_id_(resource_id) {}
  98   virtual ~ResourceBundleImageSource() {}
  99
 100   // gfx::ImageSkiaSource overrides:
 101   virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
 102     SkBitmap image;
 103     bool fell_back_to_1x = false;
 104     ScaleFactor scale_factor = GetSupportedScaleFactor(scale);
 105     bool found = rb_->LoadBitmap(resource_id_, &scale_factor,
 106                                  &image, &fell_back_to_1x);
 107     // Force to a supported scale.
 108     scale = ui::GetImageScale(scale_factor);
 109     if (!found)
 110       return gfx::ImageSkiaRep();
 111
 112     if (fell_back_to_1x) {
 113       // GRIT fell back to the 100% image, so rescale it to the correct size.
 114       image = skia::ImageOperations::Resize(
 115           image,
 116           skia::ImageOperations::RESIZE_LANCZOS3,
 117           gfx::ToCeiledInt(image.width() * scale),
 118           gfx::ToCeiledInt(image.height() * scale));
 119       // If --highlight-missing-scaled-resources is specified, log the resource
 120       // id and blend the created resource with red.
 121       if (ShouldHighlightMissingScaledResources()) {
 122         LOG(ERROR) << "Missing " << scale << "x scaled resource. id="
 123                    << resource_id_;
 124
 125         SkBitmap mask;
 126         mask.setConfig(SkBitmap::kARGB_8888_Config,
 127                        image.width(), image.height());
 128         mask.allocPixels();
 129         mask.eraseColor(SK_ColorRED);
 130         image = SkBitmapOperations::CreateBlendedBitmap(image, mask, 0.2);
 131       }
 132     }
 133
 134     return gfx::ImageSkiaRep(image, scale);
 135   }
 136
 137  private:
 138   ResourceBundle* rb_;
 139   const int resource_id_;
 140
 141   DISALLOW_COPY_AND_ASSIGN(ResourceBundleImageSource);
 142 };
 143
 144 // static
 145 std::string ResourceBundle::InitSharedInstanceWithLocale(
 146     const std::string& pref_locale, Delegate* delegate) {
 147   InitSharedInstance(delegate);
 148   g_shared_instance_->LoadCommonResources();
 149   std::string result = g_shared_instance_->LoadLocaleResources(pref_locale);
 150   InitDefaultFontList();
 151   return result;
 152 }
 153
 154 // static
 155 std::string ResourceBundle::InitSharedInstanceLocaleOnly(
 156     const std::string& pref_locale, Delegate* delegate) {
 157   InitSharedInstance(delegate);
 158   std::string result = g_shared_instance_->LoadLocaleResources(pref_locale);
 159   InitDefaultFontList();
 160   return result;
 161 }
 162
 163 // static
 164 void ResourceBundle::InitSharedInstanceWithPakFile(
 165     base::File pak_file, bool should_load_common_resources) {
 166   InitSharedInstance(NULL);
 167   if (should_load_common_resources)
 168     g_shared_instance_->LoadCommonResources();
 169
 170   scoped_ptr<DataPack> data_pack(
 171       new DataPack(SCALE_FACTOR_100P));
 172   if (!data_pack->LoadFromFile(pak_file.Pass())) {
 173     NOTREACHED() << "failed to load pak file";
 174     return;
 175   }
 176   g_shared_instance_->locale_resources_data_.reset(data_pack.release());
 177   InitDefaultFontList();
 178 }
 179
 180 // static
 181 void ResourceBundle::InitSharedInstanceWithPakPath(const base::FilePath& path) {
 182   InitSharedInstance(NULL);
 183   g_shared_instance_->LoadTestResources(path, path);
 184
 185   InitDefaultFontList();
 186 }
 187
 188 // static
 189 void ResourceBundle::CleanupSharedInstance() {
 190   if (g_shared_instance_) {
 191     delete g_shared_instance_;
 192     g_shared_instance_ = NULL;
 193   }
 194 }
 195
 196 // static
 197 bool ResourceBundle::HasSharedInstance() {
 198   return g_shared_instance_ != NULL;
 199 }
 200
 201 // static
 202 ResourceBundle& ResourceBundle::GetSharedInstance() {
 203   // Must call InitSharedInstance before this function.
 204   CHECK(g_shared_instance_ != NULL);
 205   return *g_shared_instance_;
 206 }
 207
 208 bool ResourceBundle::LocaleDataPakExists(const std::string& locale) {
 209   return !GetLocaleFilePath(locale, true).empty();
 210 }
 211
 212 void ResourceBundle::AddDataPackFromPath(const base::FilePath& path,
 213                                          ScaleFactor scale_factor) {
 214   AddDataPackFromPathInternal(path, scale_factor, false);
 215 }
 216
 217 void ResourceBundle::AddOptionalDataPackFromPath(const base::FilePath& path,
 218                                          ScaleFactor scale_factor) {
 219   AddDataPackFromPathInternal(path, scale_factor, true);
 220 }
 221
 222 void ResourceBundle::AddDataPackFromFile(base::File file,
 223                                          ScaleFactor scale_factor) {
 224   scoped_ptr<DataPack> data_pack(
 225       new DataPack(scale_factor));
 226   if (data_pack->LoadFromFile(file.Pass())) {
 227     AddDataPack(data_pack.release());
 228   } else {
 229     LOG(ERROR) << "Failed to load data pack from file."
 230                << "\nSome features may not be available.";
 231   }
 232 }
 233
 234 #if !defined(OS_MACOSX)
 235 base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
 236                                                  bool test_file_exists) {
 237   if (app_locale.empty())
 238     return base::FilePath();
 239
 240   base::FilePath locale_file_path;
 241
 242   PathService::Get(ui::DIR_LOCALES, &locale_file_path);
 243
 244   if (!locale_file_path.empty())
 245     locale_file_path = locale_file_path.AppendASCII(app_locale + ".pak");
 246
 247   if (delegate_) {
 248     locale_file_path =
 249         delegate_->GetPathForLocalePack(locale_file_path, app_locale);
 250   }
 251
 252   // Don't try to load empty values or values that are not absolute paths.
 253   if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
 254     return base::FilePath();
 255
 256   if (test_file_exists && !base::PathExists(locale_file_path))
 257     return base::FilePath();
 258
 259   return locale_file_path;
 260 }
 261 #endif
 262
 263 std::string ResourceBundle::LoadLocaleResources(
 264     const std::string& pref_locale) {
 265   DCHECK(!locale_resources_data_.get()) << "locale.pak already loaded";
 266   std::string app_locale = l10n_util::GetApplicationLocale(pref_locale);
 267   base::FilePath locale_file_path = GetOverriddenPakPath();
 268   if (locale_file_path.empty()) {
 269     CommandLine* command_line = CommandLine::ForCurrentProcess();
 270     if (command_line->HasSwitch(switches::kLocalePak)) {
 271       locale_file_path =
 272           command_line->GetSwitchValuePath(switches::kLocalePak);
 273     } else {
 274       locale_file_path = GetLocaleFilePath(app_locale, true);
 275     }
 276   }
 277
 278   if (locale_file_path.empty()) {
 279     // It's possible that there is no locale.pak.
 280     LOG(WARNING) << "locale_file_path.empty()";
 281     return std::string();
 282   }
 283
 284   scoped_ptr<DataPack> data_pack(
 285       new DataPack(SCALE_FACTOR_100P));
 286   if (!data_pack->LoadFromPath(locale_file_path)) {
 287     UMA_HISTOGRAM_ENUMERATION("ResourceBundle.LoadLocaleResourcesError",
 288                               logging::GetLastSystemErrorCode(), 16000);
 289     LOG(ERROR) << "failed to load locale.pak";
 290     NOTREACHED();
 291     return std::string();
 292   }
 293
 294   locale_resources_data_.reset(data_pack.release());
 295   return app_locale;
 296 }
 297
 298 void ResourceBundle::LoadTestResources(const base::FilePath& path,
 299                                        const base::FilePath& locale_path) {
 300   // Use the given resource pak for both common and localized resources.
 301   scoped_ptr<DataPack> data_pack(new DataPack(SCALE_FACTOR_100P));
 302   if (!path.empty() && data_pack->LoadFromPath(path))
 303     AddDataPack(data_pack.release());
 304
 305   data_pack.reset(new DataPack(ui::SCALE_FACTOR_NONE));
 306   if (!locale_path.empty() && data_pack->LoadFromPath(locale_path)) {
 307     locale_resources_data_.reset(data_pack.release());
 308   } else {
 309     locale_resources_data_.reset(new DataPack(ui::SCALE_FACTOR_NONE));
 310   }
 311 }
 312
 313 void ResourceBundle::UnloadLocaleResources() {
 314   locale_resources_data_.reset();
 315 }
 316
 317 void ResourceBundle::OverrideLocalePakForTest(const base::FilePath& pak_path) {
 318   overridden_pak_path_ = pak_path;
 319 }
 320
 321 const base::FilePath& ResourceBundle::GetOverriddenPakPath() {
 322   return overridden_pak_path_;
 323 }
 324
 325 std::string ResourceBundle::ReloadLocaleResources(
 326     const std::string& pref_locale) {
 327   base::AutoLock lock_scope(*locale_resources_data_lock_);
 328   UnloadLocaleResources();
 329   return LoadLocaleResources(pref_locale);
 330 }
 331
 332 gfx::ImageSkia* ResourceBundle::GetImageSkiaNamed(int resource_id) {
 333   const gfx::ImageSkia* image = GetImageNamed(resource_id).ToImageSkia();
 334   return const_cast<gfx::ImageSkia*>(image);
 335 }
 336
 337 gfx::Image& ResourceBundle::GetImageNamed(int resource_id) {
 338   // Check to see if the image is already in the cache.
 339   {
 340     base::AutoLock lock_scope(*images_and_fonts_lock_);
 341     if (images_.count(resource_id))
 342       return images_[resource_id];
 343   }
 344
 345   gfx::Image image;
 346   if (delegate_)
 347     image = delegate_->GetImageNamed(resource_id);
 348
 349   if (image.IsEmpty()) {
 350     DCHECK(!data_packs_.empty()) <<
 351         "Missing call to SetResourcesDataDLL?";
 352
 353 #if defined(OS_CHROMEOS)
 354     ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
 355 #else
 356     ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
 357 #endif
 358
 359     float scale = GetImageScale(scale_factor_to_load);
 360     // TODO(oshima): Consider reading the image size from png IHDR chunk and
 361     // skip decoding here and remove #ifdef below.
 362     // ResourceBundle::GetSharedInstance() is destroyed after the
 363     // BrowserMainLoop has finished running. |image_skia| is guaranteed to be
 364     // destroyed before the resource bundle is destroyed.
 365     gfx::ImageSkia image_skia(new ResourceBundleImageSource(this, resource_id),
 366                               scale);
 367     if (image_skia.isNull()) {
 368       LOG(WARNING) << "Unable to load image with id " << resource_id;
 369       NOTREACHED();  // Want to assert in debug mode.
 370       // The load failed to retrieve the image; show a debugging red square.
 371       return GetEmptyImage();
 372     }
 373     image_skia.SetReadOnly();
 374     image = gfx::Image(image_skia);
 375   }
 376
 377   // The load was successful, so cache the image.
 378   base::AutoLock lock_scope(*images_and_fonts_lock_);
 379
 380   // Another thread raced the load and has already cached the image.
 381   if (images_.count(resource_id))
 382     return images_[resource_id];
 383
 384   images_[resource_id] = image;
 385   return images_[resource_id];
 386 }
 387
 388 gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
 389   return GetNativeImageNamed(resource_id, RTL_DISABLED);
 390 }
 391
 392 base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytes(
 393     int resource_id) const {
 394   return LoadDataResourceBytesForScale(resource_id, ui::SCALE_FACTOR_NONE);
 395 }
 396
 397 base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytesForScale(
 398     int resource_id,
 399     ScaleFactor scale_factor) const {
 400   base::RefCountedStaticMemory* bytes = NULL;
 401   if (delegate_)
 402     bytes = delegate_->LoadDataResourceBytes(resource_id, scale_factor);
 403
 404   if (!bytes) {
 405     base::StringPiece data =
 406         GetRawDataResourceForScale(resource_id, scale_factor);
 407     if (!data.empty()) {
 408       bytes = new base::RefCountedStaticMemory(
 409           reinterpret_cast<const unsigned char*>(data.data()), data.length());
 410     }
 411   }
 412
 413   return bytes;
 414 }
 415
 416 base::StringPiece ResourceBundle::GetRawDataResource(int resource_id) const {
 417   return GetRawDataResourceForScale(resource_id, ui::SCALE_FACTOR_NONE);
 418 }
 419
 420 base::StringPiece ResourceBundle::GetRawDataResourceForScale(
 421     int resource_id,
 422     ScaleFactor scale_factor) const {
 423   base::StringPiece data;
 424   if (delegate_ &&
 425       delegate_->GetRawDataResource(resource_id, scale_factor, &data))
 426     return data;
 427
 428   if (scale_factor != ui::SCALE_FACTOR_100P) {
 429     for (size_t i = 0; i < data_packs_.size(); i++) {
 430       if (data_packs_[i]->GetScaleFactor() == scale_factor &&
 431           data_packs_[i]->GetStringPiece(resource_id, &data))
 432         return data;
 433     }
 434   }
 435   for (size_t i = 0; i < data_packs_.size(); i++) {
 436     if ((data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P ||
 437          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE) &&
 438         data_packs_[i]->GetStringPiece(resource_id, &data))
 439       return data;
 440   }
 441
 442   return base::StringPiece();
 443 }
 444
 445 base::string16 ResourceBundle::GetLocalizedString(int message_id) {
 446   base::string16 string;
 447   if (delegate_ && delegate_->GetLocalizedString(message_id, &string))
 448     return string;
 449
 450   // Ensure that ReloadLocaleResources() doesn't drop the resources while
 451   // we're using them.
 452   base::AutoLock lock_scope(*locale_resources_data_lock_);
 453
 454   // If for some reason we were unable to load the resources , return an empty
 455   // string (better than crashing).
 456   if (!locale_resources_data_.get()) {
 457     LOG(WARNING) << "locale resources are not loaded";
 458     return base::string16();
 459   }
 460
 461   base::StringPiece data;
 462   if (!locale_resources_data_->GetStringPiece(message_id, &data)) {
 463     // Fall back on the main data pack (shouldn't be any strings here except in
 464     // unittests).
 465     data = GetRawDataResource(message_id);
 466     if (data.empty()) {
 467       NOTREACHED() << "unable to find resource: " << message_id;
 468       return base::string16();
 469     }
 470   }
 471
 472   // Strings should not be loaded from a data pack that contains binary data.
 473   ResourceHandle::TextEncodingType encoding =
 474       locale_resources_data_->GetTextEncodingType();
 475   DCHECK(encoding == ResourceHandle::UTF16 || encoding == ResourceHandle::UTF8)
 476       << "requested localized string from binary pack file";
 477
 478   // Data pack encodes strings as either UTF8 or UTF16.
 479   base::string16 msg;
 480   if (encoding == ResourceHandle::UTF16) {
 481     msg = base::string16(reinterpret_cast<const base::char16*>(data.data()),
 482                          data.length() / 2);
 483   } else if (encoding == ResourceHandle::UTF8) {
 484     msg = base::UTF8ToUTF16(data);
 485   }
 486   return msg;
 487 }
 488
 489 const gfx::FontList& ResourceBundle::GetFontList(FontStyle style) {
 490   {
 491     base::AutoLock lock_scope(*images_and_fonts_lock_);
 492     LoadFontsIfNecessary();
 493   }
 494   switch (style) {
 495     case BoldFont:
 496       return *bold_font_list_;
 497     case SmallFont:
 498       return *small_font_list_;
 499     case MediumFont:
 500       return *medium_font_list_;
 501     case SmallBoldFont:
 502       return *small_bold_font_list_;
 503     case MediumBoldFont:
 504       return *medium_bold_font_list_;
 505     case LargeFont:
 506       return *large_font_list_;
 507     case LargeBoldFont:
 508       return *large_bold_font_list_;
 509     default:
 510       return *base_font_list_;
 511   }
 512 }
 513
 514 const gfx::Font& ResourceBundle::GetFont(FontStyle style) {
 515   return GetFontList(style).GetPrimaryFont();
 516 }
 517
 518 void ResourceBundle::ReloadFonts() {
 519   base::AutoLock lock_scope(*images_and_fonts_lock_);
 520   base_font_list_.reset();
 521   LoadFontsIfNecessary();
 522 }
 523
 524 ScaleFactor ResourceBundle::GetMaxScaleFactor() const {
 525 #if defined(OS_CHROMEOS)
 526   return max_scale_factor_;
 527 #else
 528   return GetSupportedScaleFactors().back();
 529 #endif
 530 }
 531
 532 ResourceBundle::ResourceBundle(Delegate* delegate)
 533     : delegate_(delegate),
 534       images_and_fonts_lock_(new base::Lock),
 535       locale_resources_data_lock_(new base::Lock),
 536       max_scale_factor_(SCALE_FACTOR_100P) {
 537 }
 538
 539 ResourceBundle::~ResourceBundle() {
 540   FreeImages();
 541   UnloadLocaleResources();
 542 }
 543
 544 // static
 545 void ResourceBundle::InitSharedInstance(Delegate* delegate) {
 546   DCHECK(g_shared_instance_ == NULL) << "ResourceBundle initialized twice";
 547   g_shared_instance_ = new ResourceBundle(delegate);
 548   static std::vector<ScaleFactor> supported_scale_factors;
 549 #if !defined(OS_IOS)
 550   // On platforms other than iOS, 100P is always a supported scale factor.
 551   supported_scale_factors.push_back(SCALE_FACTOR_100P);
 552 #endif
 553 #if defined(OS_ANDROID)
 554   const gfx::Display display =
 555       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
 556   const float display_density = display.device_scale_factor();
 557   const ScaleFactor closest = FindClosestScaleFactorUnsafe(display_density);
 558   if (closest != SCALE_FACTOR_100P)
 559     supported_scale_factors.push_back(closest);
 560 #elif defined(OS_IOS)
 561     gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
 562   if (display.device_scale_factor() > 1.0) {
 563     DCHECK_EQ(2.0, display.device_scale_factor());
 564     supported_scale_factors.push_back(SCALE_FACTOR_200P);
 565   } else {
 566     supported_scale_factors.push_back(SCALE_FACTOR_100P);
 567   }
 568 #elif defined(OS_MACOSX)
 569   if (base::mac::IsOSLionOrLater())
 570     supported_scale_factors.push_back(SCALE_FACTOR_200P);
 571 #elif defined(OS_CHROMEOS)
 572   // TODO(oshima): Include 200P only if the device support 200P
 573   supported_scale_factors.push_back(SCALE_FACTOR_200P);
 574 #endif
 575   ui::SetSupportedScaleFactors(supported_scale_factors);
 576 #if defined(OS_WIN)
 577   // Must be called _after_ supported scale factors are set since it
 578   // uses them.
 579   ui::win::InitDeviceScaleFactor();
 580 #endif
 581 }
 582
 583 void ResourceBundle::FreeImages() {
 584   images_.clear();
 585 }
 586
 587 void ResourceBundle::AddDataPackFromPathInternal(const base::FilePath& path,
 588                                                  ScaleFactor scale_factor,
 589                                                  bool optional) {
 590   // Do not pass an empty |path| value to this method. If the absolute path is
 591   // unknown pass just the pack file name.
 592   DCHECK(!path.empty());
 593
 594   base::FilePath pack_path = path;
 595   if (delegate_)
 596     pack_path = delegate_->GetPathForResourcePack(pack_path, scale_factor);
 597
 598   // Don't try to load empty values or values that are not absolute paths.
 599   if (pack_path.empty() || !pack_path.IsAbsolute())
 600     return;
 601
 602   scoped_ptr<DataPack> data_pack(
 603       new DataPack(scale_factor));
 604   if (data_pack->LoadFromPath(pack_path)) {
 605     AddDataPack(data_pack.release());
 606   } else if (!optional) {
 607     LOG(ERROR) << "Failed to load " << pack_path.value()
 608                << "\nSome features may not be available.";
 609   }
 610 }
 611
 612 void ResourceBundle::AddDataPack(DataPack* data_pack) {
 613   data_packs_.push_back(data_pack);
 614
 615   if (GetImageScale(data_pack->GetScaleFactor()) >
 616       GetImageScale(max_scale_factor_))
 617     max_scale_factor_ = data_pack->GetScaleFactor();
 618 }
 619
 620 void ResourceBundle::LoadFontsIfNecessary() {
 621   images_and_fonts_lock_->AssertAcquired();
 622   if (!base_font_list_.get()) {
 623     if (delegate_) {
 624       base_font_list_ = GetFontListFromDelegate(BaseFont);
 625       bold_font_list_ = GetFontListFromDelegate(BoldFont);
 626       small_font_list_ = GetFontListFromDelegate(SmallFont);
 627       small_bold_font_list_ = GetFontListFromDelegate(SmallBoldFont);
 628       medium_font_list_ = GetFontListFromDelegate(MediumFont);
 629       medium_bold_font_list_ = GetFontListFromDelegate(MediumBoldFont);
 630       large_font_list_ = GetFontListFromDelegate(LargeFont);
 631       large_bold_font_list_ = GetFontListFromDelegate(LargeBoldFont);
 632     }
 633
 634     if (!base_font_list_.get())
 635       base_font_list_.reset(new gfx::FontList());
 636
 637     if (!bold_font_list_.get()) {
 638       bold_font_list_.reset(new gfx::FontList());
 639       *bold_font_list_ = base_font_list_->DeriveFontList(
 640           base_font_list_->GetFontStyle() | gfx::Font::BOLD);
 641     }
 642
 643     if (!small_font_list_.get()) {
 644       small_font_list_.reset(new gfx::FontList());
 645       *small_font_list_ = base_font_list_->DeriveFontListWithSize(
 646           base_font_list_->GetFontSize() + kSmallFontSizeDelta);
 647     }
 648
 649     if (!small_bold_font_list_.get()) {
 650       small_bold_font_list_.reset(new gfx::FontList());
 651       *small_bold_font_list_ = small_font_list_->DeriveFontList(
 652           small_font_list_->GetFontStyle() | gfx::Font::BOLD);
 653     }
 654
 655     if (!medium_font_list_.get()) {
 656       medium_font_list_.reset(new gfx::FontList());
 657       *medium_font_list_ = base_font_list_->DeriveFontListWithSize(
 658           base_font_list_->GetFontSize() + kMediumFontSizeDelta);
 659     }
 660
 661     if (!medium_bold_font_list_.get()) {
 662       medium_bold_font_list_.reset(new gfx::FontList());
 663       *medium_bold_font_list_ = medium_font_list_->DeriveFontList(
 664           medium_font_list_->GetFontStyle() | gfx::Font::BOLD);
 665     }
 666
 667     if (!large_font_list_.get()) {
 668       large_font_list_.reset(new gfx::FontList());
 669       *large_font_list_ = base_font_list_->DeriveFontListWithSize(
 670           base_font_list_->GetFontSize() + kLargeFontSizeDelta);
 671     }
 672
 673     if (!large_bold_font_list_.get()) {
 674       large_bold_font_list_.reset(new gfx::FontList());
 675       *large_bold_font_list_ = large_font_list_->DeriveFontList(
 676           large_font_list_->GetFontStyle() | gfx::Font::BOLD);
 677     }
 678   }
 679 }
 680
 681 scoped_ptr<gfx::FontList> ResourceBundle::GetFontListFromDelegate(
 682     FontStyle style) {
 683   DCHECK(delegate_);
 684   scoped_ptr<gfx::Font> font = delegate_->GetFont(style);
 685   if (font.get())
 686     return scoped_ptr<gfx::FontList>(new gfx::FontList(*font));
 687   return scoped_ptr<gfx::FontList>();
 688 }
 689
 690 bool ResourceBundle::LoadBitmap(const ResourceHandle& data_handle,
 691                                 int resource_id,
 692                                 SkBitmap* bitmap,
 693                                 bool* fell_back_to_1x) const {
 694   DCHECK(fell_back_to_1x);
 695   scoped_refptr<base::RefCountedMemory> memory(
 696       data_handle.GetStaticMemory(resource_id));
 697   if (!memory.get())
 698     return false;
 699
 700   if (DecodePNG(memory->front(), memory->size(), bitmap, fell_back_to_1x))
 701     return true;
 702
 703 #if !defined(OS_IOS)
 704   // iOS does not compile or use the JPEG codec.  On other platforms,
 705   // 99% of our assets are PNGs, however fallback to JPEG.
 706   scoped_ptr<SkBitmap> jpeg_bitmap(
 707       gfx::JPEGCodec::Decode(memory->front(), memory->size()));
 708   if (jpeg_bitmap.get()) {
 709     bitmap->swap(*jpeg_bitmap.get());
 710     *fell_back_to_1x = false;
 711     return true;
 712   }
 713 #endif
 714
 715   NOTREACHED() << "Unable to decode theme image resource " << resource_id;
 716   return false;
 717 }
 718
 719 bool ResourceBundle::LoadBitmap(int resource_id,
 720                                 ScaleFactor* scale_factor,
 721                                 SkBitmap* bitmap,
 722                                 bool* fell_back_to_1x) const {
 723   DCHECK(fell_back_to_1x);
 724   for (size_t i = 0; i < data_packs_.size(); ++i) {
 725     // If the resource is in the package with SCALE_FACTOR_NONE, it
 726     // can be used in any scale factor, but set 100P in ImageSkia so
 727     // that it will be scaled property.
 728     if (data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE &&
 729         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
 730       *scale_factor = ui::SCALE_FACTOR_100P;
 731       DCHECK(!*fell_back_to_1x);
 732       return true;
 733     }
 734     if (data_packs_[i]->GetScaleFactor() == *scale_factor &&
 735         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
 736       return true;
 737     }
 738   }
 739   return false;
 740 }
 741
 742 gfx::Image& ResourceBundle::GetEmptyImage() {
 743   base::AutoLock lock(*images_and_fonts_lock_);
 744
 745   if (empty_image_.IsEmpty()) {
 746     // The placeholder bitmap is bright red so people notice the problem.
 747     SkBitmap bitmap;
 748     bitmap.setConfig(SkBitmap::kARGB_8888_Config, 32, 32);
 749     bitmap.allocPixels();
 750     bitmap.eraseARGB(255, 255, 0, 0);
 751     empty_image_ = gfx::Image::CreateFrom1xBitmap(bitmap);
 752   }
 753   return empty_image_;
 754 }
 755
 756 // static
 757 bool ResourceBundle::ShouldHighlightMissingScaledResources() {
 758   return CommandLine::ForCurrentProcess()->HasSwitch(
 759       switches::kHighlightMissingScaledResources);
 760 }
 761
 762 // static
 763 bool ResourceBundle::PNGContainsFallbackMarker(const unsigned char* buf,
 764                                size_t size) {
 765   if (size < arraysize(kPngMagic) ||
 766       memcmp(buf, kPngMagic, arraysize(kPngMagic)) != 0) {
 767     // Data invalid or a JPEG.
 768     return false;
 769   }
 770   size_t pos = arraysize(kPngMagic);
 771
 772   // Scan for custom chunks until we find one, find the IDAT chunk, or run out
 773   // of chunks.
 774   for (;;) {
 775     if (size - pos < kPngChunkMetadataSize)
 776       break;
 777     uint32 length = 0;
 778     net::ReadBigEndian(reinterpret_cast<const char*>(buf + pos), &length);
 779     if (size - pos - kPngChunkMetadataSize < length)
 780       break;
 781     if (length == 0 && memcmp(buf + pos + sizeof(uint32), kPngScaleChunkType,
 782                               arraysize(kPngScaleChunkType)) == 0) {
 783       return true;
 784     }
 785     if (memcmp(buf + pos + sizeof(uint32), kPngDataChunkType,
 786                arraysize(kPngDataChunkType)) == 0) {
 787       // Stop looking for custom chunks, any custom chunks should be before an
 788       // IDAT chunk.
 789       break;
 790     }
 791     pos += length + kPngChunkMetadataSize;
 792   }
 793   return false;
 794 }
 795
 796 // static
 797 bool ResourceBundle::DecodePNG(const unsigned char* buf,
 798                                size_t size,
 799                                SkBitmap* bitmap,
 800                                bool* fell_back_to_1x) {
 801   *fell_back_to_1x = PNGContainsFallbackMarker(buf, size);
 802   return gfx::PNGCodec::Decode(buf, size, bitmap);
 803 }
 804
 805 }  // namespace ui