components/wallpaper/wallpaper_manager_base.cc

   1 // Copyright 2014 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 "components/wallpaper/wallpaper_manager_base.h"
   6
   7 #include <numeric>
   8 #include <vector>
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/file_util.h"
  13 #include "base/logging.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/path_service.h"
  16 #include "base/prefs/pref_registry_simple.h"
  17 #include "base/prefs/pref_service.h"
  18 #include "base/prefs/scoped_user_pref_update.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/strings/stringprintf.h"
  22 #include "base/sys_info.h"
  23 #include "base/threading/worker_pool.h"
  24 #include "base/time/time.h"
  25 #include "base/values.h"
  26 #include "chromeos/chromeos_switches.h"
  27 #include "chromeos/cryptohome/async_method_caller.h"
  28 #include "chromeos/dbus/dbus_thread_manager.h"
  29 #include "chromeos/login/user_names.h"
  30 #include "components/user_manager/user.h"
  31 #include "components/user_manager/user_image/user_image.h"
  32 #include "components/user_manager/user_manager.h"
  33 #include "components/user_manager/user_type.h"
  34 #include "components/wallpaper/wallpaper_layout.h"
  35 #include "content/public/browser/browser_thread.h"
  36 #include "third_party/skia/include/core/SkColor.h"
  37 #include "ui/gfx/codec/jpeg_codec.h"
  38 #include "ui/gfx/geometry/safe_integer_conversions.h"
  39 #include "ui/gfx/image/image_skia_operations.h"
  40 #include "ui/gfx/skia_util.h"
  41
  42 using content::BrowserThread;
  43
  44 namespace wallpaper {
  45
  46 namespace {
  47
  48 // Default quality for encoding wallpaper.
  49 const int kDefaultEncodingQuality = 90;
  50
  51 // Maximum number of wallpapers cached by CacheUsersWallpapers().
  52 const int kMaxWallpapersToCache = 3;
  53
  54 // Maximum number of entries in WallpaperManagerBase::last_load_times_ .
  55 const size_t kLastLoadsStatsMsMaxSize = 4;
  56
  57 // Minimum delay between wallpaper loads, milliseconds.
  58 const unsigned kLoadMinDelayMs = 50;
  59
  60 // Default wallpaper load delay, milliseconds.
  61 const unsigned kLoadDefaultDelayMs = 200;
  62
  63 // Maximum wallpaper load delay, milliseconds.
  64 const unsigned kLoadMaxDelayMs = 2000;
  65
  66 // When no wallpaper image is specified, the screen is filled with a solid
  67 // color.
  68 const SkColor kDefaultWallpaperColor = SK_ColorGRAY;
  69
  70 // The path ids for directories.
  71 int dir_user_data_path_id = -1;            // chrome::DIR_USER_DATA
  72 int dir_chromeos_wallpapers_path_id = -1;  // chrome::DIR_CHROMEOS_WALLPAPERS
  73 int dir_chromeos_custom_wallpapers_path_id =
  74     -1;  // chrome::DIR_CHROMEOS_CUSTOM_WALLPAPERS
  75
  76 bool MoveCustomWallpaperDirectory(const char* sub_dir,
  77                                   const std::string& user_id,
  78                                   const std::string& user_id_hash) {
  79   base::FilePath base_path =
  80       WallpaperManagerBase::GetCustomWallpaperDir(sub_dir);
  81   base::FilePath to_path = base_path.Append(user_id_hash);
  82   base::FilePath from_path = base_path.Append(user_id);
  83   if (base::PathExists(from_path))
  84     return base::Move(from_path, to_path);
  85   return false;
  86 }
  87
  88 // Deletes a list of wallpaper files in |file_list|.
  89 void DeleteWallpaperInList(const std::vector<base::FilePath>& file_list) {
  90   for (std::vector<base::FilePath>::const_iterator it = file_list.begin();
  91        it != file_list.end(); ++it) {
  92     base::FilePath path = *it;
  93     // Some users may still have legacy wallpapers with png extension. We need
  94     // to delete these wallpapers too.
  95     if (!base::DeleteFile(path, true) &&
  96         !base::DeleteFile(path.AddExtension(".png"), false)) {
  97       LOG(ERROR) << "Failed to remove user wallpaper at " << path.value();
  98     }
  99   }
 100 }
 101
 102 // Creates all new custom wallpaper directories for |user_id_hash| if not exist.
 103 // static
 104 void EnsureCustomWallpaperDirectories(const std::string& user_id_hash) {
 105   base::FilePath dir;
 106   dir = WallpaperManagerBase::GetCustomWallpaperDir(kSmallWallpaperSubDir);
 107   dir = dir.Append(user_id_hash);
 108   if (!base::PathExists(dir))
 109     base::CreateDirectory(dir);
 110   dir = WallpaperManagerBase::GetCustomWallpaperDir(kLargeWallpaperSubDir);
 111   dir = dir.Append(user_id_hash);
 112   if (!base::PathExists(dir))
 113     base::CreateDirectory(dir);
 114   dir = WallpaperManagerBase::GetCustomWallpaperDir(kOriginalWallpaperSubDir);
 115   dir = dir.Append(user_id_hash);
 116   if (!base::PathExists(dir))
 117     base::CreateDirectory(dir);
 118   dir = WallpaperManagerBase::GetCustomWallpaperDir(kThumbnailWallpaperSubDir);
 119   dir = dir.Append(user_id_hash);
 120   if (!base::PathExists(dir))
 121     base::CreateDirectory(dir);
 122 }
 123
 124 // Saves wallpaper image raw |data| to |path| (absolute path) in file system.
 125 // Returns true on success.
 126 bool SaveWallpaperInternal(const base::FilePath& path,
 127                            const char* data,
 128                            int size) {
 129   int written_bytes = base::WriteFile(path, data, size);
 130   return written_bytes == size;
 131 }
 132
 133 }  // namespace
 134
 135 MovableOnDestroyCallback::MovableOnDestroyCallback(
 136     const base::Closure& callback)
 137     : callback_(callback) {
 138 }
 139
 140 MovableOnDestroyCallback::~MovableOnDestroyCallback() {
 141   if (!callback_.is_null())
 142     callback_.Run();
 143 }
 144
 145 WallpaperInfo::WallpaperInfo()
 146     : layout(WALLPAPER_LAYOUT_CENTER),
 147       type(user_manager::User::WALLPAPER_TYPE_COUNT) {
 148 }
 149
 150 WallpaperInfo::WallpaperInfo(const std::string& in_location,
 151                              WallpaperLayout in_layout,
 152                              user_manager::User::WallpaperType in_type,
 153                              const base::Time& in_date)
 154     : location(in_location),
 155       layout(in_layout),
 156       type(in_type),
 157       date(in_date) {
 158 }
 159
 160 WallpaperInfo::~WallpaperInfo() {
 161 }
 162
 163 const char kWallpaperSequenceTokenName[] = "wallpaper-sequence";
 164
 165 const char kSmallWallpaperSuffix[] = "_small";
 166 const char kLargeWallpaperSuffix[] = "_large";
 167
 168 const char kSmallWallpaperSubDir[] = "small";
 169 const char kLargeWallpaperSubDir[] = "large";
 170 const char kOriginalWallpaperSubDir[] = "original";
 171 const char kThumbnailWallpaperSubDir[] = "thumb";
 172
 173 const int kSmallWallpaperMaxWidth = 1366;
 174 const int kSmallWallpaperMaxHeight = 800;
 175 const int kLargeWallpaperMaxWidth = 2560;
 176 const int kLargeWallpaperMaxHeight = 1700;
 177 const int kWallpaperThumbnailWidth = 108;
 178 const int kWallpaperThumbnailHeight = 68;
 179
 180 const char kUsersWallpaperInfo[] = "user_wallpaper_info";
 181
 182 const char kUserWallpapers[] = "UserWallpapers";
 183 const char kUserWallpapersProperties[] = "UserWallpapersProperties";
 184
 185 const base::FilePath&
 186 WallpaperManagerBase::CustomizedWallpaperRescaledFiles::path_downloaded()
 187     const {
 188   return path_downloaded_;
 189 }
 190
 191 const base::FilePath&
 192 WallpaperManagerBase::CustomizedWallpaperRescaledFiles::path_rescaled_small()
 193     const {
 194   return path_rescaled_small_;
 195 }
 196
 197 const base::FilePath&
 198 WallpaperManagerBase::CustomizedWallpaperRescaledFiles::path_rescaled_large()
 199     const {
 200   return path_rescaled_large_;
 201 }
 202
 203 bool WallpaperManagerBase::CustomizedWallpaperRescaledFiles::downloaded_exists()
 204     const {
 205   return downloaded_exists_;
 206 }
 207
 208 bool WallpaperManagerBase::CustomizedWallpaperRescaledFiles::
 209     rescaled_small_exists() const {
 210   return rescaled_small_exists_;
 211 }
 212
 213 bool WallpaperManagerBase::CustomizedWallpaperRescaledFiles::
 214     rescaled_large_exists() const {
 215   return rescaled_large_exists_;
 216 }
 217
 218 WallpaperManagerBase::CustomizedWallpaperRescaledFiles::
 219     CustomizedWallpaperRescaledFiles(const base::FilePath& path_downloaded,
 220                                      const base::FilePath& path_rescaled_small,
 221                                      const base::FilePath& path_rescaled_large)
 222     : path_downloaded_(path_downloaded),
 223       path_rescaled_small_(path_rescaled_small),
 224       path_rescaled_large_(path_rescaled_large),
 225       downloaded_exists_(false),
 226       rescaled_small_exists_(false),
 227       rescaled_large_exists_(false) {
 228 }
 229
 230 base::Closure
 231 WallpaperManagerBase::CustomizedWallpaperRescaledFiles::CreateCheckerClosure() {
 232   return base::Bind(&WallpaperManagerBase::CustomizedWallpaperRescaledFiles::
 233                         CheckCustomizedWallpaperFilesExist,
 234                     base::Unretained(this));
 235 }
 236
 237 void WallpaperManagerBase::CustomizedWallpaperRescaledFiles::
 238     CheckCustomizedWallpaperFilesExist() {
 239   DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
 240   downloaded_exists_ = base::PathExists(path_downloaded_);
 241   rescaled_small_exists_ = base::PathExists(path_rescaled_small_);
 242   rescaled_large_exists_ = base::PathExists(path_rescaled_large_);
 243 }
 244
 245 bool WallpaperManagerBase::CustomizedWallpaperRescaledFiles::AllSizesExist()
 246     const {
 247   return rescaled_small_exists_ && rescaled_large_exists_;
 248 }
 249
 250 // WallpaperManagerBase, public:
 251
 252 // TestApi. For testing purpose
 253 WallpaperManagerBase::TestApi::TestApi(WallpaperManagerBase* wallpaper_manager)
 254     : wallpaper_manager_(wallpaper_manager) {
 255 }
 256
 257 WallpaperManagerBase::TestApi::~TestApi() {
 258 }
 259
 260 base::FilePath WallpaperManagerBase::TestApi::current_wallpaper_path() {
 261   return wallpaper_manager_->current_wallpaper_path_;
 262 }
 263
 264 bool WallpaperManagerBase::TestApi::GetWallpaperFromCache(
 265     const std::string& user_id,
 266     gfx::ImageSkia* image) {
 267   return wallpaper_manager_->GetWallpaperFromCache(user_id, image);
 268 }
 269
 270 void WallpaperManagerBase::TestApi::SetWallpaperCache(
 271     const std::string& user_id,
 272     const gfx::ImageSkia& image) {
 273   DCHECK(!image.isNull());
 274   wallpaper_manager_->wallpaper_cache_[user_id] = image;
 275 }
 276
 277 void WallpaperManagerBase::TestApi::ClearDisposableWallpaperCache() {
 278   wallpaper_manager_->ClearDisposableWallpaperCache();
 279 }
 280
 281 // static
 282 void WallpaperManagerBase::SetPathIds(
 283     int dir_user_data_enum,
 284     int dir_chromeos_wallpapers_enum,
 285     int dir_chromeos_custom_wallpapers_enum) {
 286   dir_user_data_path_id = dir_user_data_enum;
 287   dir_chromeos_wallpapers_path_id = dir_chromeos_wallpapers_enum;
 288   dir_chromeos_custom_wallpapers_path_id = dir_chromeos_custom_wallpapers_enum;
 289 }
 290
 291 // static
 292 base::FilePath WallpaperManagerBase::GetCustomWallpaperDir(
 293     const char* sub_dir) {
 294   base::FilePath custom_wallpaper_dir;
 295   DCHECK(dir_chromeos_custom_wallpapers_path_id != -1);
 296   CHECK(PathService::Get(dir_chromeos_custom_wallpapers_path_id,
 297                          &custom_wallpaper_dir));
 298   return custom_wallpaper_dir.Append(sub_dir);
 299 }
 300
 301 // static
 302 void WallpaperManagerBase::RegisterPrefs(PrefRegistrySimple* registry) {
 303   registry->RegisterDictionaryPref(kUsersWallpaperInfo);
 304   registry->RegisterDictionaryPref(kUserWallpapers);
 305   registry->RegisterDictionaryPref(kUserWallpapersProperties);
 306 }
 307
 308 void WallpaperManagerBase::EnsureLoggedInUserWallpaperLoaded() {
 309   WallpaperInfo info;
 310   if (GetLoggedInUserWallpaperInfo(&info)) {
 311     UMA_HISTOGRAM_ENUMERATION("Ash.Wallpaper.Type", info.type,
 312                               user_manager::User::WALLPAPER_TYPE_COUNT);
 313     if (info == current_user_wallpaper_info_)
 314       return;
 315   }
 316   SetUserWallpaperNow(
 317       user_manager::UserManager::Get()->GetLoggedInUser()->email());
 318 }
 319
 320 void WallpaperManagerBase::ClearDisposableWallpaperCache() {
 321   // Cancel callback for previous cache requests.
 322   weak_factory_.InvalidateWeakPtrs();
 323   // Keep the wallpaper of logged in users in cache at multi-profile mode.
 324   std::set<std::string> logged_in_users_names;
 325   const user_manager::UserList& logged_users =
 326       user_manager::UserManager::Get()->GetLoggedInUsers();
 327   for (user_manager::UserList::const_iterator it = logged_users.begin();
 328        it != logged_users.end(); ++it) {
 329     logged_in_users_names.insert((*it)->email());
 330   }
 331
 332   CustomWallpaperMap logged_in_users_cache;
 333   for (CustomWallpaperMap::iterator it = wallpaper_cache_.begin();
 334        it != wallpaper_cache_.end(); ++it) {
 335     if (logged_in_users_names.find(it->first) != logged_in_users_names.end()) {
 336       logged_in_users_cache.insert(*it);
 337     }
 338   }
 339   wallpaper_cache_ = logged_in_users_cache;
 340 }
 341
 342 bool WallpaperManagerBase::GetLoggedInUserWallpaperInfo(WallpaperInfo* info) {
 343   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 344
 345   if (user_manager::UserManager::Get()->IsLoggedInAsStub()) {
 346     info->location = current_user_wallpaper_info_.location = "";
 347     info->layout = current_user_wallpaper_info_.layout =
 348         WALLPAPER_LAYOUT_CENTER_CROPPED;
 349     info->type = current_user_wallpaper_info_.type =
 350         user_manager::User::DEFAULT;
 351     info->date = current_user_wallpaper_info_.date =
 352         base::Time::Now().LocalMidnight();
 353     return true;
 354   }
 355
 356   return GetUserWallpaperInfo(
 357       user_manager::UserManager::Get()->GetLoggedInUser()->email(), info);
 358 }
 359
 360 // static
 361 bool WallpaperManagerBase::ResizeImage(
 362     const gfx::ImageSkia& image,
 363     WallpaperLayout layout,
 364     int preferred_width,
 365     int preferred_height,
 366     scoped_refptr<base::RefCountedBytes>* output,
 367     gfx::ImageSkia* output_skia) {
 368   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::UI));
 369   int width = image.width();
 370   int height = image.height();
 371   int resized_width;
 372   int resized_height;
 373   *output = new base::RefCountedBytes();
 374
 375   if (layout == WALLPAPER_LAYOUT_CENTER_CROPPED) {
 376     // Do not resize custom wallpaper if it is smaller than preferred size.
 377     if (!(width > preferred_width && height > preferred_height))
 378       return false;
 379
 380     double horizontal_ratio = static_cast<double>(preferred_width) / width;
 381     double vertical_ratio = static_cast<double>(preferred_height) / height;
 382     if (vertical_ratio > horizontal_ratio) {
 383       resized_width =
 384           gfx::ToRoundedInt(static_cast<double>(width) * vertical_ratio);
 385       resized_height = preferred_height;
 386     } else {
 387       resized_width = preferred_width;
 388       resized_height =
 389           gfx::ToRoundedInt(static_cast<double>(height) * horizontal_ratio);
 390     }
 391   } else if (layout == WALLPAPER_LAYOUT_STRETCH) {
 392     resized_width = preferred_width;
 393     resized_height = preferred_height;
 394   } else {
 395     resized_width = width;
 396     resized_height = height;
 397   }
 398
 399   gfx::ImageSkia resized_image = gfx::ImageSkiaOperations::CreateResizedImage(
 400       image, skia::ImageOperations::RESIZE_LANCZOS3,
 401       gfx::Size(resized_width, resized_height));
 402
 403   SkBitmap bitmap = *(resized_image.bitmap());
 404   SkAutoLockPixels lock_input(bitmap);
 405   gfx::JPEGCodec::Encode(
 406       reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
 407       gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), bitmap.height(),
 408       bitmap.width() * bitmap.bytesPerPixel(), kDefaultEncodingQuality,
 409       &(*output)->data());
 410
 411   if (output_skia) {
 412     resized_image.MakeThreadSafe();
 413     *output_skia = resized_image;
 414   }
 415
 416   return true;
 417 }
 418
 419 // static
 420 bool WallpaperManagerBase::ResizeAndSaveWallpaper(const gfx::ImageSkia& image,
 421                                                   const base::FilePath& path,
 422                                                   WallpaperLayout layout,
 423                                                   int preferred_width,
 424                                                   int preferred_height,
 425                                                   gfx::ImageSkia* output_skia) {
 426   if (layout == WALLPAPER_LAYOUT_CENTER) {
 427     // TODO(bshe): Generates cropped custom wallpaper for CENTER layout.
 428     if (base::PathExists(path))
 429       base::DeleteFile(path, false);
 430     return false;
 431   }
 432   scoped_refptr<base::RefCountedBytes> data;
 433   if (ResizeImage(image, layout, preferred_width, preferred_height, &data,
 434                   output_skia)) {
 435     return SaveWallpaperInternal(
 436         path, reinterpret_cast<const char*>(data->front()), data->size());
 437   }
 438   return false;
 439 }
 440
 441 bool WallpaperManagerBase::IsPolicyControlled(
 442     const std::string& user_id) const {
 443   WallpaperInfo info;
 444   if (!GetUserWallpaperInfo(user_id, &info))
 445     return false;
 446   return info.type == user_manager::User::POLICY;
 447 }
 448
 449 void WallpaperManagerBase::OnPolicySet(const std::string& policy,
 450                                        const std::string& user_id) {
 451   WallpaperInfo info;
 452   GetUserWallpaperInfo(user_id, &info);
 453   info.type = user_manager::User::POLICY;
 454   SetUserWallpaperInfo(user_id, info, true /* is_persistent */);
 455 }
 456
 457 void WallpaperManagerBase::OnPolicyCleared(const std::string& policy,
 458                                            const std::string& user_id) {
 459   WallpaperInfo info;
 460   GetUserWallpaperInfo(user_id, &info);
 461   info.type = user_manager::User::DEFAULT;
 462   SetUserWallpaperInfo(user_id, info, true /* is_persistent */);
 463   SetDefaultWallpaperNow(user_id);
 464 }
 465
 466 // static
 467 base::FilePath WallpaperManagerBase::GetCustomWallpaperPath(
 468     const char* sub_dir,
 469     const std::string& user_id_hash,
 470     const std::string& file) {
 471   base::FilePath custom_wallpaper_path = GetCustomWallpaperDir(sub_dir);
 472   return custom_wallpaper_path.Append(user_id_hash).Append(file);
 473 }
 474
 475 WallpaperManagerBase::WallpaperManagerBase()
 476     : loaded_wallpapers_(0),
 477       command_line_for_testing_(NULL),
 478       should_cache_wallpaper_(false),
 479       weak_factory_(this) {
 480   SetDefaultWallpaperPathsFromCommandLine(
 481       base::CommandLine::ForCurrentProcess());
 482   sequence_token_ = BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
 483       kWallpaperSequenceTokenName);
 484   task_runner_ =
 485       BrowserThread::GetBlockingPool()
 486           ->GetSequencedTaskRunnerWithShutdownBehavior(
 487               sequence_token_, base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
 488 }
 489
 490 WallpaperManagerBase::~WallpaperManagerBase() {
 491   // TODO(bshe): Lifetime of WallpaperManagerBase needs more consideration.
 492   // http://crbug.com/171694
 493   weak_factory_.InvalidateWeakPtrs();
 494 }
 495
 496 void WallpaperManagerBase::SetPolicyControlledWallpaper(
 497     const std::string& user_id,
 498     const user_manager::UserImage& user_image) {
 499   const user_manager::User* user =
 500       user_manager::UserManager::Get()->FindUser(user_id);
 501   if (!user) {
 502     NOTREACHED() << "Unknown user.";
 503     return;
 504   }
 505
 506   if (user->username_hash().empty()) {
 507     cryptohome::AsyncMethodCaller::GetInstance()->AsyncGetSanitizedUsername(
 508         user_id,
 509         base::Bind(&WallpaperManagerBase::SetCustomWallpaperOnSanitizedUsername,
 510                    weak_factory_.GetWeakPtr(), user_id, user_image.image(),
 511                    true /* update wallpaper */));
 512   } else {
 513     SetCustomWallpaper(user_id, user->username_hash(), "policy-controlled.jpeg",
 514                        WALLPAPER_LAYOUT_CENTER_CROPPED,
 515                        user_manager::User::POLICY, user_image.image(),
 516                        true /* update wallpaper */);
 517   }
 518 }
 519
 520 void WallpaperManagerBase::SetCustomWallpaperOnSanitizedUsername(
 521     const std::string& user_id,
 522     const gfx::ImageSkia& image,
 523     bool update_wallpaper,
 524     bool cryptohome_success,
 525     const std::string& user_id_hash) {
 526   if (!cryptohome_success)
 527     return;
 528   SetCustomWallpaper(user_id, user_id_hash, "policy-controlled.jpeg",
 529                      WALLPAPER_LAYOUT_CENTER_CROPPED,
 530                      user_manager::User::POLICY, image, update_wallpaper);
 531 }
 532
 533 // static
 534 void WallpaperManagerBase::SaveCustomWallpaper(
 535     const std::string& user_id_hash,
 536     const base::FilePath& original_path,
 537     WallpaperLayout layout,
 538     scoped_ptr<gfx::ImageSkia> image) {
 539   base::DeleteFile(
 540       GetCustomWallpaperDir(kOriginalWallpaperSubDir).Append(user_id_hash),
 541       true /* recursive */);
 542   base::DeleteFile(
 543       GetCustomWallpaperDir(kSmallWallpaperSubDir).Append(user_id_hash),
 544       true /* recursive */);
 545   base::DeleteFile(
 546       GetCustomWallpaperDir(kLargeWallpaperSubDir).Append(user_id_hash),
 547       true /* recursive */);
 548   EnsureCustomWallpaperDirectories(user_id_hash);
 549   std::string file_name = original_path.BaseName().value();
 550   base::FilePath small_wallpaper_path =
 551       GetCustomWallpaperPath(kSmallWallpaperSubDir, user_id_hash, file_name);
 552   base::FilePath large_wallpaper_path =
 553       GetCustomWallpaperPath(kLargeWallpaperSubDir, user_id_hash, file_name);
 554
 555   // Re-encode orginal file to jpeg format and saves the result in case that
 556   // resized wallpaper is not generated (i.e. chrome shutdown before resized
 557   // wallpaper is saved).
 558   ResizeAndSaveWallpaper(*image, original_path, WALLPAPER_LAYOUT_STRETCH,
 559                          image->width(), image->height(), NULL);
 560   ResizeAndSaveWallpaper(*image, small_wallpaper_path, layout,
 561                          kSmallWallpaperMaxWidth, kSmallWallpaperMaxHeight,
 562                          NULL);
 563   ResizeAndSaveWallpaper(*image, large_wallpaper_path, layout,
 564                          kLargeWallpaperMaxWidth, kLargeWallpaperMaxHeight,
 565                          NULL);
 566 }
 567
 568 // static
 569 void WallpaperManagerBase::MoveCustomWallpapersOnWorker(
 570     const std::string& user_id,
 571     const std::string& user_id_hash,
 572     base::WeakPtr<WallpaperManagerBase> weak_ptr) {
 573   if (MoveCustomWallpaperDirectory(kOriginalWallpaperSubDir, user_id,
 574                                    user_id_hash)) {
 575     // Consider success if the original wallpaper is moved to the new directory.
 576     // Original wallpaper is the fallback if the correct resolution wallpaper
 577     // can not be found.
 578     BrowserThread::PostTask(
 579         BrowserThread::UI, FROM_HERE,
 580         base::Bind(&WallpaperManagerBase::MoveCustomWallpapersSuccess, weak_ptr,
 581                    user_id, user_id_hash));
 582   }
 583   MoveCustomWallpaperDirectory(kLargeWallpaperSubDir, user_id, user_id_hash);
 584   MoveCustomWallpaperDirectory(kSmallWallpaperSubDir, user_id, user_id_hash);
 585   MoveCustomWallpaperDirectory(kThumbnailWallpaperSubDir, user_id,
 586                                user_id_hash);
 587 }
 588
 589 // static
 590 void WallpaperManagerBase::GetCustomWallpaperInternal(
 591     const std::string& user_id,
 592     const WallpaperInfo& info,
 593     const base::FilePath& wallpaper_path,
 594     bool update_wallpaper,
 595     MovableOnDestroyCallbackHolder on_finish,
 596     base::WeakPtr<WallpaperManagerBase> weak_ptr) {
 597   base::FilePath valid_path = wallpaper_path;
 598   if (!base::PathExists(wallpaper_path)) {
 599     // Falls back on original file if the correct resolution file does not
 600     // exist. This may happen when the original custom wallpaper is small or
 601     // browser shutdown before resized wallpaper saved.
 602     valid_path = GetCustomWallpaperDir(kOriginalWallpaperSubDir);
 603     valid_path = valid_path.Append(info.location);
 604   }
 605
 606   if (!base::PathExists(valid_path)) {
 607     // Falls back to custom wallpaper that uses email as part of its file path.
 608     // Note that email is used instead of user_id_hash here.
 609     valid_path = GetCustomWallpaperPath(kOriginalWallpaperSubDir, user_id,
 610                                         info.location);
 611   }
 612
 613   if (!base::PathExists(valid_path)) {
 614     LOG(ERROR) << "Failed to load previously selected custom wallpaper. "
 615                << "Fallback to default wallpaper";
 616     BrowserThread::PostTask(
 617         BrowserThread::UI, FROM_HERE,
 618         base::Bind(&WallpaperManagerBase::DoSetDefaultWallpaper, weak_ptr,
 619                    user_id, base::Passed(on_finish.Pass())));
 620   } else {
 621     BrowserThread::PostTask(
 622         BrowserThread::UI, FROM_HERE,
 623         base::Bind(&WallpaperManagerBase::StartLoad, weak_ptr, user_id, info,
 624                    update_wallpaper, valid_path,
 625                    base::Passed(on_finish.Pass())));
 626   }
 627 }
 628
 629 void WallpaperManagerBase::InitInitialUserWallpaper(const std::string& user_id,
 630                                                     bool is_persistent) {
 631   current_user_wallpaper_info_.location = "";
 632   current_user_wallpaper_info_.layout = WALLPAPER_LAYOUT_CENTER_CROPPED;
 633   current_user_wallpaper_info_.type = user_manager::User::DEFAULT;
 634   current_user_wallpaper_info_.date = base::Time::Now().LocalMidnight();
 635
 636   WallpaperInfo info = current_user_wallpaper_info_;
 637   SetUserWallpaperInfo(user_id, info, is_persistent);
 638 }
 639
 640 void WallpaperManagerBase::SetUserWallpaperDelayed(const std::string& user_id) {
 641   ScheduleSetUserWallpaper(user_id, true);
 642 }
 643
 644 void WallpaperManagerBase::SetUserWallpaperNow(const std::string& user_id) {
 645   ScheduleSetUserWallpaper(user_id, false);
 646 }
 647
 648 void WallpaperManagerBase::UpdateWallpaper(bool clear_cache) {
 649   FOR_EACH_OBSERVER(Observer, observers_, OnUpdateWallpaperForTesting());
 650   if (clear_cache)
 651     wallpaper_cache_.clear();
 652   current_wallpaper_path_.clear();
 653   // For GAIA login flow, the last_selected_user_ may not be set before user
 654   // login. If UpdateWallpaper is called at GAIA login screen, no wallpaper will
 655   // be set. It could result a black screen on external monitors.
 656   // See http://crbug.com/265689 for detail.
 657   if (last_selected_user_.empty()) {
 658     SetDefaultWallpaperNow(chromeos::login::kSignInUser);
 659     return;
 660   }
 661   SetUserWallpaperNow(last_selected_user_);
 662 }
 663
 664 void WallpaperManagerBase::AddObserver(
 665     WallpaperManagerBase::Observer* observer) {
 666   observers_.AddObserver(observer);
 667 }
 668
 669 void WallpaperManagerBase::RemoveObserver(
 670     WallpaperManagerBase::Observer* observer) {
 671   observers_.RemoveObserver(observer);
 672 }
 673
 674 void WallpaperManagerBase::NotifyAnimationFinished() {
 675   FOR_EACH_OBSERVER(Observer, observers_,
 676                     OnWallpaperAnimationFinished(last_selected_user_));
 677 }
 678
 679 // WallpaperManager, protected: -----------------------------------------------
 680
 681 bool WallpaperManagerBase::GetWallpaperFromCache(const std::string& user_id,
 682                                                  gfx::ImageSkia* image) {
 683   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 684   CustomWallpaperMap::const_iterator it = wallpaper_cache_.find(user_id);
 685   if (it != wallpaper_cache_.end()) {
 686     *image = (*it).second;
 687     return true;
 688   }
 689   return false;
 690 }
 691
 692 int WallpaperManagerBase::loaded_wallpapers() const {
 693   return loaded_wallpapers_;
 694 }
 695
 696 void WallpaperManagerBase::CacheUsersWallpapers() {
 697   // TODO(dpolukhin): crbug.com/408734.
 698   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 699   user_manager::UserList users = user_manager::UserManager::Get()->GetUsers();
 700
 701   if (!users.empty()) {
 702     user_manager::UserList::const_iterator it = users.begin();
 703     // Skip the wallpaper of first user in the list. It should have been cached.
 704     it++;
 705     for (int cached = 0; it != users.end() && cached < kMaxWallpapersToCache;
 706          ++it, ++cached) {
 707       std::string user_id = (*it)->email();
 708       CacheUserWallpaper(user_id);
 709     }
 710   }
 711 }
 712
 713 void WallpaperManagerBase::CacheUserWallpaper(const std::string& user_id) {
 714   if (wallpaper_cache_.find(user_id) != wallpaper_cache_.end())
 715     return;
 716   WallpaperInfo info;
 717   if (GetUserWallpaperInfo(user_id, &info)) {
 718     if (info.location.empty())
 719       return;
 720
 721     base::FilePath wallpaper_dir;
 722     base::FilePath wallpaper_path;
 723     if (info.type == user_manager::User::CUSTOMIZED ||
 724         info.type == user_manager::User::POLICY) {
 725       const char* sub_dir = GetCustomWallpaperSubdirForCurrentResolution();
 726       base::FilePath wallpaper_path = GetCustomWallpaperDir(sub_dir);
 727       wallpaper_path = wallpaper_path.Append(info.location);
 728       task_runner_->PostTask(
 729           FROM_HERE,
 730           base::Bind(&WallpaperManagerBase::GetCustomWallpaperInternal, user_id,
 731                      info, wallpaper_path, false /* do not update wallpaper */,
 732                      base::Passed(MovableOnDestroyCallbackHolder()),
 733                      weak_factory_.GetWeakPtr()));
 734       return;
 735     }
 736     LoadWallpaper(user_id, info, false /* do not update wallpaper */,
 737                   MovableOnDestroyCallbackHolder().Pass());
 738   }
 739 }
 740
 741 void WallpaperManagerBase::DeleteUserWallpapers(
 742     const std::string& user_id,
 743     const std::string& path_to_file) {
 744   std::vector<base::FilePath> file_to_remove;
 745   // Remove small user wallpaper.
 746   base::FilePath wallpaper_path = GetCustomWallpaperDir(kSmallWallpaperSubDir);
 747   // Remove old directory if exists
 748   file_to_remove.push_back(wallpaper_path.Append(user_id));
 749   wallpaper_path = wallpaper_path.Append(path_to_file).DirName();
 750   file_to_remove.push_back(wallpaper_path);
 751
 752   // Remove large user wallpaper.
 753   wallpaper_path = GetCustomWallpaperDir(kLargeWallpaperSubDir);
 754   file_to_remove.push_back(wallpaper_path.Append(user_id));
 755   wallpaper_path = wallpaper_path.Append(path_to_file);
 756   file_to_remove.push_back(wallpaper_path);
 757
 758   // Remove user wallpaper thumbnail.
 759   wallpaper_path = GetCustomWallpaperDir(kThumbnailWallpaperSubDir);
 760   file_to_remove.push_back(wallpaper_path.Append(user_id));
 761   wallpaper_path = wallpaper_path.Append(path_to_file);
 762   file_to_remove.push_back(wallpaper_path);
 763
 764   // Remove original user wallpaper.
 765   wallpaper_path = GetCustomWallpaperDir(kOriginalWallpaperSubDir);
 766   file_to_remove.push_back(wallpaper_path.Append(user_id));
 767   wallpaper_path = wallpaper_path.Append(path_to_file);
 768   file_to_remove.push_back(wallpaper_path);
 769
 770   base::WorkerPool::PostTask(
 771       FROM_HERE, base::Bind(&DeleteWallpaperInList, file_to_remove), false);
 772 }
 773
 774 void WallpaperManagerBase::SetCommandLineForTesting(
 775     base::CommandLine* command_line) {
 776   command_line_for_testing_ = command_line;
 777   SetDefaultWallpaperPathsFromCommandLine(command_line);
 778 }
 779
 780 base::CommandLine* WallpaperManagerBase::GetCommandLine() {
 781   base::CommandLine* command_line =
 782       command_line_for_testing_ ? command_line_for_testing_
 783                                 : base::CommandLine::ForCurrentProcess();
 784   return command_line;
 785 }
 786
 787 void WallpaperManagerBase::LoadWallpaper(
 788     const std::string& user_id,
 789     const WallpaperInfo& info,
 790     bool update_wallpaper,
 791     MovableOnDestroyCallbackHolder on_finish) {
 792   base::FilePath wallpaper_dir;
 793   base::FilePath wallpaper_path;
 794
 795   // Do a sanity check that file path information is not empty.
 796   if (info.type == user_manager::User::ONLINE ||
 797       info.type == user_manager::User::DEFAULT) {
 798     if (info.location.empty()) {
 799       if (base::SysInfo::IsRunningOnChromeOS()) {
 800         NOTREACHED() << "User wallpaper info appears to be broken: " << user_id;
 801       } else {
 802         // Filename might be empty on debug configurations when stub users
 803         // were created directly in Local State (for testing). Ignore such
 804         // errors i.e. allowsuch type of debug configurations on the desktop.
 805         LOG(WARNING) << "User wallpaper info is empty: " << user_id;
 806
 807         // |on_finish| callback will get called on destruction.
 808         return;
 809       }
 810     }
 811   }
 812
 813   if (info.type == user_manager::User::ONLINE) {
 814     std::string file_name = GURL(info.location).ExtractFileName();
 815     WallpaperResolution resolution = GetAppropriateResolution();
 816     // Only solid color wallpapers have stretch layout and they have only one
 817     // resolution.
 818     if (info.layout != WALLPAPER_LAYOUT_STRETCH &&
 819         resolution == WALLPAPER_RESOLUTION_SMALL) {
 820       file_name = base::FilePath(file_name)
 821                       .InsertBeforeExtension(kSmallWallpaperSuffix)
 822                       .value();
 823     }
 824     DCHECK(dir_chromeos_wallpapers_path_id != -1);
 825     CHECK(PathService::Get(dir_chromeos_wallpapers_path_id,
 826                            &wallpaper_dir));
 827     wallpaper_path = wallpaper_dir.Append(file_name);
 828     if (current_wallpaper_path_ == wallpaper_path)
 829       return;
 830
 831     if (update_wallpaper)
 832       current_wallpaper_path_ = wallpaper_path;
 833
 834     loaded_wallpapers_++;
 835     StartLoad(user_id, info, update_wallpaper, wallpaper_path,
 836               on_finish.Pass());
 837   } else if (info.type == user_manager::User::DEFAULT) {
 838     // Default wallpapers are migrated from M21 user profiles. A code refactor
 839     // overlooked that case and caused these wallpapers not being loaded at all.
 840     // On some slow devices, it caused login webui not visible after upgrade to
 841     // M26 from M21. See crosbug.com/38429 for details.
 842     base::FilePath user_data_dir;
 843     DCHECK(dir_user_data_path_id != -1);
 844     PathService::Get(dir_user_data_path_id, &user_data_dir);
 845     wallpaper_path = user_data_dir.Append(info.location);
 846     StartLoad(user_id, info, update_wallpaper, wallpaper_path,
 847               on_finish.Pass());
 848   } else {
 849     // In unexpected cases, revert to default wallpaper to fail safely. See
 850     // crosbug.com/38429.
 851     LOG(ERROR) << "Wallpaper reverts to default unexpected.";
 852     DoSetDefaultWallpaper(user_id, on_finish.Pass());
 853   }
 854 }
 855
 856 void WallpaperManagerBase::MoveCustomWallpapersSuccess(
 857     const std::string& user_id,
 858     const std::string& user_id_hash) {
 859   WallpaperInfo info;
 860   GetUserWallpaperInfo(user_id, &info);
 861   if (info.type == user_manager::User::CUSTOMIZED) {
 862     // New file field should include user id hash in addition to file name.
 863     // This is needed because at login screen, user id hash is not available.
 864     info.location = base::FilePath(user_id_hash).Append(info.location).value();
 865     bool is_persistent =
 866         !user_manager::UserManager::Get()->IsUserNonCryptohomeDataEphemeral(
 867             user_id);
 868     SetUserWallpaperInfo(user_id, info, is_persistent);
 869   }
 870 }
 871
 872 void WallpaperManagerBase::MoveLoggedInUserCustomWallpaper() {
 873   const user_manager::User* logged_in_user =
 874       user_manager::UserManager::Get()->GetLoggedInUser();
 875   if (logged_in_user) {
 876     task_runner_->PostTask(
 877         FROM_HERE,
 878         base::Bind(&WallpaperManagerBase::MoveCustomWallpapersOnWorker,
 879                    logged_in_user->email(), logged_in_user->username_hash(),
 880                    weak_factory_.GetWeakPtr()));
 881   }
 882 }
 883
 884 void WallpaperManagerBase::SaveLastLoadTime(const base::TimeDelta elapsed) {
 885   while (last_load_times_.size() >= kLastLoadsStatsMsMaxSize)
 886     last_load_times_.pop_front();
 887
 888   if (elapsed > base::TimeDelta::FromMicroseconds(0)) {
 889     last_load_times_.push_back(elapsed);
 890     last_load_finished_at_ = base::Time::Now();
 891   }
 892 }
 893
 894 base::TimeDelta WallpaperManagerBase::GetWallpaperLoadDelay() const {
 895   base::TimeDelta delay;
 896
 897   if (last_load_times_.size() == 0) {
 898     delay = base::TimeDelta::FromMilliseconds(kLoadDefaultDelayMs);
 899   } else {
 900     delay = std::accumulate(last_load_times_.begin(), last_load_times_.end(),
 901                             base::TimeDelta(), std::plus<base::TimeDelta>()) /
 902             last_load_times_.size();
 903   }
 904
 905   if (delay < base::TimeDelta::FromMilliseconds(kLoadMinDelayMs))
 906     delay = base::TimeDelta::FromMilliseconds(kLoadMinDelayMs);
 907   else if (delay > base::TimeDelta::FromMilliseconds(kLoadMaxDelayMs))
 908     delay = base::TimeDelta::FromMilliseconds(kLoadMaxDelayMs);
 909
 910   // If we had ever loaded wallpaper, adjust wait delay by time since last load.
 911   if (!last_load_finished_at_.is_null()) {
 912     const base::TimeDelta interval = base::Time::Now() - last_load_finished_at_;
 913     if (interval > delay)
 914       delay = base::TimeDelta::FromMilliseconds(0);
 915     else if (interval > base::TimeDelta::FromMilliseconds(0))
 916       delay -= interval;
 917   }
 918   return delay;
 919 }
 920
 921 void WallpaperManagerBase::OnCustomizedDefaultWallpaperDecoded(
 922     const GURL& wallpaper_url,
 923     scoped_ptr<CustomizedWallpaperRescaledFiles> rescaled_files,
 924     const user_manager::UserImage& wallpaper) {
 925   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 926
 927   // If decoded wallpaper is empty, we have probably failed to decode the file.
 928   if (wallpaper.image().isNull()) {
 929     LOG(WARNING) << "Failed to decode customized wallpaper.";
 930     return;
 931   }
 932
 933   wallpaper.image().EnsureRepsForSupportedScales();
 934   scoped_ptr<gfx::ImageSkia> deep_copy(wallpaper.image().DeepCopy());
 935
 936   scoped_ptr<bool> success(new bool(false));
 937   scoped_ptr<gfx::ImageSkia> small_wallpaper_image(new gfx::ImageSkia);
 938   scoped_ptr<gfx::ImageSkia> large_wallpaper_image(new gfx::ImageSkia);
 939
 940   // TODO(bshe): This may break if RawImage becomes RefCountedMemory.
 941   base::Closure resize_closure = base::Bind(
 942       &WallpaperManagerBase::ResizeCustomizedDefaultWallpaper,
 943       base::Passed(&deep_copy), wallpaper.raw_image(),
 944       base::Unretained(rescaled_files.get()), base::Unretained(success.get()),
 945       base::Unretained(small_wallpaper_image.get()),
 946       base::Unretained(large_wallpaper_image.get()));
 947   base::Closure on_resized_closure = base::Bind(
 948       &WallpaperManagerBase::OnCustomizedDefaultWallpaperResized,
 949       weak_factory_.GetWeakPtr(), wallpaper_url,
 950       base::Passed(rescaled_files.Pass()), base::Passed(success.Pass()),
 951       base::Passed(small_wallpaper_image.Pass()),
 952       base::Passed(large_wallpaper_image.Pass()));
 953
 954   if (!task_runner_->PostTaskAndReply(FROM_HERE, resize_closure,
 955                                       on_resized_closure)) {
 956     LOG(WARNING) << "Failed to start Customized Wallpaper resize.";
 957   }
 958 }
 959
 960 void WallpaperManagerBase::ResizeCustomizedDefaultWallpaper(
 961     scoped_ptr<gfx::ImageSkia> image,
 962     const user_manager::UserImage::RawImage& raw_image,
 963     const CustomizedWallpaperRescaledFiles* rescaled_files,
 964     bool* success,
 965     gfx::ImageSkia* small_wallpaper_image,
 966     gfx::ImageSkia* large_wallpaper_image) {
 967   *success = true;
 968
 969   *success &= ResizeAndSaveWallpaper(
 970       *image, rescaled_files->path_rescaled_small(), WALLPAPER_LAYOUT_STRETCH,
 971       kSmallWallpaperMaxWidth, kSmallWallpaperMaxHeight, small_wallpaper_image);
 972
 973   *success &= ResizeAndSaveWallpaper(
 974       *image, rescaled_files->path_rescaled_large(), WALLPAPER_LAYOUT_STRETCH,
 975       kLargeWallpaperMaxWidth, kLargeWallpaperMaxHeight, large_wallpaper_image);
 976 }
 977
 978 void WallpaperManagerBase::SetCustomizedDefaultWallpaper(
 979     const GURL& wallpaper_url,
 980     const base::FilePath& downloaded_file,
 981     const base::FilePath& resized_directory) {
 982   // Should fail if this ever happens in tests.
 983   DCHECK(wallpaper_url.is_valid());
 984   if (!wallpaper_url.is_valid()) {
 985     if (!wallpaper_url.is_empty()) {
 986       LOG(WARNING) << "Invalid Customized Wallpaper URL '"
 987                    << wallpaper_url.spec() << "'";
 988     }
 989     return;
 990   }
 991   std::string downloaded_file_name = downloaded_file.BaseName().value();
 992   scoped_ptr<CustomizedWallpaperRescaledFiles> rescaled_files(
 993       new CustomizedWallpaperRescaledFiles(
 994           downloaded_file, resized_directory.Append(downloaded_file_name +
 995                                                     kSmallWallpaperSuffix),
 996           resized_directory.Append(downloaded_file_name +
 997                                    kLargeWallpaperSuffix)));
 998
 999   base::Closure check_file_exists = rescaled_files->CreateCheckerClosure();
1000   base::Closure on_checked_closure =
1001       base::Bind(&WallpaperManagerBase::SetCustomizedDefaultWallpaperAfterCheck,
1002                  weak_factory_.GetWeakPtr(), wallpaper_url, downloaded_file,
1003                  base::Passed(rescaled_files.Pass()));
1004   if (!BrowserThread::PostBlockingPoolTaskAndReply(FROM_HERE, check_file_exists,
1005                                                    on_checked_closure)) {
1006     LOG(WARNING) << "Failed to start check CheckCustomizedWallpaperFilesExist.";
1007   }
1008 }
1009
1010 void WallpaperManagerBase::SetDefaultWallpaperPathsFromCommandLine(
1011     base::CommandLine* command_line) {
1012   default_small_wallpaper_file_ = command_line->GetSwitchValuePath(
1013       chromeos::switches::kDefaultWallpaperSmall);
1014   default_large_wallpaper_file_ = command_line->GetSwitchValuePath(
1015       chromeos::switches::kDefaultWallpaperLarge);
1016   guest_small_wallpaper_file_ = command_line->GetSwitchValuePath(
1017       chromeos::switches::kGuestWallpaperSmall);
1018   guest_large_wallpaper_file_ = command_line->GetSwitchValuePath(
1019       chromeos::switches::kGuestWallpaperLarge);
1020   default_wallpaper_image_.reset();
1021 }
1022
1023 const char*
1024 WallpaperManagerBase::GetCustomWallpaperSubdirForCurrentResolution() {
1025   WallpaperResolution resolution = GetAppropriateResolution();
1026   return resolution == WALLPAPER_RESOLUTION_SMALL ? kSmallWallpaperSubDir
1027                                                   : kLargeWallpaperSubDir;
1028 }
1029
1030 void WallpaperManagerBase::CreateSolidDefaultWallpaper() {
1031   loaded_wallpapers_++;
1032   SkBitmap bitmap;
1033   bitmap.allocN32Pixels(1, 1);
1034   bitmap.eraseColor(kDefaultWallpaperColor);
1035   const gfx::ImageSkia image = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
1036   default_wallpaper_image_.reset(new user_manager::UserImage(image));
1037 }
1038
1039 }  // namespace wallpaper