ash/desktop_background/desktop_background_controller.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 "ash/desktop_background/desktop_background_controller.h"
   6
   7 #include "ash/ash_switches.h"
   8 #include "ash/desktop_background/desktop_background_controller_observer.h"
   9 #include "ash/desktop_background/desktop_background_view.h"
  10 #include "ash/desktop_background/desktop_background_widget_controller.h"
  11 #include "ash/desktop_background/user_wallpaper_delegate.h"
  12 #include "ash/display/display_info.h"
  13 #include "ash/display/display_manager.h"
  14 #include "ash/root_window_controller.h"
  15 #include "ash/shell.h"
  16 #include "ash/shell_factory.h"
  17 #include "ash/shell_window_ids.h"
  18 #include "ash/wm/root_window_layout_manager.h"
  19 #include "base/bind.h"
  20 #include "base/command_line.h"
  21 #include "base/files/file_util.h"
  22 #include "base/logging.h"
  23 #include "base/synchronization/cancellation_flag.h"
  24 #include "base/threading/worker_pool.h"
  25 #include "components/wallpaper/wallpaper_resizer.h"
  26 #include "content/public/browser/browser_thread.h"
  27 #include "ui/aura/window.h"
  28 #include "ui/aura/window_event_dispatcher.h"
  29 #include "ui/compositor/layer.h"
  30 #include "ui/gfx/codec/jpeg_codec.h"
  31 #include "ui/gfx/geometry/rect.h"
  32 #include "ui/gfx/image/image_skia.h"
  33 #include "ui/views/widget/widget.h"
  34
  35 using content::BrowserThread;
  36 using wallpaper::WallpaperResizer;
  37 using wallpaper::WallpaperLayout;
  38 using wallpaper::WALLPAPER_LAYOUT_CENTER;
  39 using wallpaper::WALLPAPER_LAYOUT_CENTER_CROPPED;
  40 using wallpaper::WALLPAPER_LAYOUT_STRETCH;
  41 using wallpaper::WALLPAPER_LAYOUT_TILE;
  42
  43 namespace ash {
  44 namespace {
  45
  46 // How long to wait reloading the wallpaper after the max display has
  47 // changed?
  48 const int kWallpaperReloadDelayMs = 100;
  49
  50 }  // namespace
  51
  52 DesktopBackgroundController::DesktopBackgroundController()
  53     : locked_(false),
  54       desktop_background_mode_(BACKGROUND_NONE),
  55       wallpaper_reload_delay_(kWallpaperReloadDelayMs) {
  56   Shell::GetInstance()->display_controller()->AddObserver(this);
  57   Shell::GetInstance()->AddShellObserver(this);
  58 }
  59
  60 DesktopBackgroundController::~DesktopBackgroundController() {
  61   Shell::GetInstance()->display_controller()->RemoveObserver(this);
  62   Shell::GetInstance()->RemoveShellObserver(this);
  63 }
  64
  65 gfx::ImageSkia DesktopBackgroundController::GetWallpaper() const {
  66   if (current_wallpaper_)
  67     return current_wallpaper_->image();
  68   return gfx::ImageSkia();
  69 }
  70
  71 void DesktopBackgroundController::AddObserver(
  72     DesktopBackgroundControllerObserver* observer) {
  73   observers_.AddObserver(observer);
  74 }
  75
  76 void DesktopBackgroundController::RemoveObserver(
  77     DesktopBackgroundControllerObserver* observer) {
  78   observers_.RemoveObserver(observer);
  79 }
  80
  81 WallpaperLayout DesktopBackgroundController::GetWallpaperLayout() const {
  82   if (current_wallpaper_)
  83     return current_wallpaper_->layout();
  84   return WALLPAPER_LAYOUT_CENTER_CROPPED;
  85 }
  86
  87 bool DesktopBackgroundController::SetWallpaperImage(const gfx::ImageSkia& image,
  88                                                     WallpaperLayout layout) {
  89   VLOG(1) << "SetWallpaper: image_id=" << WallpaperResizer::GetImageId(image)
  90           << " layout=" << layout;
  91
  92   if (WallpaperIsAlreadyLoaded(image, true /* compare_layouts */, layout)) {
  93     VLOG(1) << "Wallpaper is already loaded";
  94     return false;
  95   }
  96
  97   current_wallpaper_.reset(
  98       new WallpaperResizer(image, GetMaxDisplaySizeInNative(), layout,
  99                            BrowserThread::GetBlockingPool()));
 100   current_wallpaper_->StartResize();
 101
 102   FOR_EACH_OBSERVER(DesktopBackgroundControllerObserver,
 103                     observers_,
 104                     OnWallpaperDataChanged());
 105   SetDesktopBackgroundImageMode();
 106   return true;
 107 }
 108
 109 void DesktopBackgroundController::CreateEmptyWallpaper() {
 110   current_wallpaper_.reset(NULL);
 111   SetDesktopBackgroundImageMode();
 112 }
 113
 114 bool DesktopBackgroundController::MoveDesktopToLockedContainer() {
 115   if (locked_)
 116     return false;
 117   locked_ = true;
 118   return ReparentBackgroundWidgets(GetBackgroundContainerId(false),
 119                                    GetBackgroundContainerId(true));
 120 }
 121
 122 bool DesktopBackgroundController::MoveDesktopToUnlockedContainer() {
 123   if (!locked_)
 124     return false;
 125   locked_ = false;
 126   return ReparentBackgroundWidgets(GetBackgroundContainerId(true),
 127                                    GetBackgroundContainerId(false));
 128 }
 129
 130 void DesktopBackgroundController::OnDisplayConfigurationChanged() {
 131   gfx::Size max_display_size = GetMaxDisplaySizeInNative();
 132   if (current_max_display_size_ != max_display_size) {
 133     current_max_display_size_ = max_display_size;
 134     if (desktop_background_mode_ == BACKGROUND_IMAGE &&
 135         current_wallpaper_.get()) {
 136       timer_.Stop();
 137       timer_.Start(FROM_HERE,
 138                    base::TimeDelta::FromMilliseconds(wallpaper_reload_delay_),
 139                    base::Bind(&DesktopBackgroundController::UpdateWallpaper,
 140                               base::Unretained(this), false /* clear cache */));
 141     }
 142   }
 143 }
 144
 145 void DesktopBackgroundController::OnRootWindowAdded(aura::Window* root_window) {
 146   // The background hasn't been set yet.
 147   if (desktop_background_mode_ == BACKGROUND_NONE)
 148     return;
 149
 150   // Handle resolution change for "built-in" images.
 151   gfx::Size max_display_size = GetMaxDisplaySizeInNative();
 152   if (current_max_display_size_ != max_display_size) {
 153     current_max_display_size_ = max_display_size;
 154     if (desktop_background_mode_ == BACKGROUND_IMAGE &&
 155         current_wallpaper_.get())
 156       UpdateWallpaper(true /* clear cache */);
 157   }
 158
 159   InstallDesktopController(root_window);
 160 }
 161
 162 // static
 163 gfx::Size DesktopBackgroundController::GetMaxDisplaySizeInNative() {
 164   int width = 0;
 165   int height = 0;
 166   std::vector<gfx::Display> displays = Shell::GetScreen()->GetAllDisplays();
 167   DisplayManager* display_manager = Shell::GetInstance()->display_manager();
 168
 169   for (std::vector<gfx::Display>::iterator iter = displays.begin();
 170        iter != displays.end(); ++iter) {
 171     // Don't use size_in_pixel because we want to use the native pixel size.
 172     gfx::Size size_in_pixel =
 173         display_manager->GetDisplayInfo(iter->id()).bounds_in_native().size();
 174     if (iter->rotation() == gfx::Display::ROTATE_90 ||
 175         iter->rotation() == gfx::Display::ROTATE_270) {
 176       size_in_pixel = gfx::Size(size_in_pixel.height(), size_in_pixel.width());
 177     }
 178     width = std::max(size_in_pixel.width(), width);
 179     height = std::max(size_in_pixel.height(), height);
 180   }
 181   return gfx::Size(width, height);
 182 }
 183
 184 bool DesktopBackgroundController::WallpaperIsAlreadyLoaded(
 185     const gfx::ImageSkia& image,
 186     bool compare_layouts,
 187     WallpaperLayout layout) const {
 188   if (!current_wallpaper_.get())
 189     return false;
 190
 191   // Compare layouts only if necessary.
 192   if (compare_layouts && layout != current_wallpaper_->layout())
 193     return false;
 194
 195   return WallpaperResizer::GetImageId(image) ==
 196          current_wallpaper_->original_image_id();
 197 }
 198
 199 void DesktopBackgroundController::SetDesktopBackgroundImageMode() {
 200   desktop_background_mode_ = BACKGROUND_IMAGE;
 201   InstallDesktopControllerForAllWindows();
 202 }
 203
 204 void DesktopBackgroundController::InstallDesktopController(
 205     aura::Window* root_window) {
 206   DesktopBackgroundWidgetController* component = NULL;
 207   int container_id = GetBackgroundContainerId(locked_);
 208
 209   switch (desktop_background_mode_) {
 210     case BACKGROUND_IMAGE: {
 211       views::Widget* widget =
 212           CreateDesktopBackground(root_window, container_id);
 213       component = new DesktopBackgroundWidgetController(widget);
 214       break;
 215     }
 216     case BACKGROUND_NONE:
 217       NOTREACHED();
 218       return;
 219   }
 220   GetRootWindowController(root_window)->SetAnimatingWallpaperController(
 221       new AnimatingDesktopController(component));
 222
 223   component->StartAnimating(GetRootWindowController(root_window));
 224 }
 225
 226 void DesktopBackgroundController::InstallDesktopControllerForAllWindows() {
 227   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
 228   for (aura::Window::Windows::iterator iter = root_windows.begin();
 229        iter != root_windows.end(); ++iter) {
 230     InstallDesktopController(*iter);
 231   }
 232   current_max_display_size_ = GetMaxDisplaySizeInNative();
 233 }
 234
 235 bool DesktopBackgroundController::ReparentBackgroundWidgets(int src_container,
 236                                                             int dst_container) {
 237   bool moved = false;
 238   Shell::RootWindowControllerList controllers =
 239       Shell::GetAllRootWindowControllers();
 240   for (Shell::RootWindowControllerList::iterator iter = controllers.begin();
 241     iter != controllers.end(); ++iter) {
 242     RootWindowController* root_window_controller = *iter;
 243     // In the steady state (no animation playing) the background widget
 244     // controller exists in the RootWindowController.
 245     DesktopBackgroundWidgetController* desktop_controller =
 246         root_window_controller->wallpaper_controller();
 247     if (desktop_controller) {
 248       moved |=
 249           desktop_controller->Reparent(root_window_controller->GetRootWindow(),
 250                                        src_container,
 251                                        dst_container);
 252     }
 253     // During desktop show animations the controller lives in
 254     // AnimatingDesktopController owned by RootWindowController.
 255     // NOTE: If a wallpaper load happens during a desktop show animation there
 256     // can temporarily be two desktop background widgets.  We must reparent
 257     // both of them - one above and one here.
 258     DesktopBackgroundWidgetController* animating_controller =
 259         root_window_controller->animating_wallpaper_controller() ?
 260         root_window_controller->animating_wallpaper_controller()->
 261             GetController(false) :
 262         NULL;
 263     if (animating_controller) {
 264       moved |= animating_controller->Reparent(
 265           root_window_controller->GetRootWindow(),
 266           src_container,
 267           dst_container);
 268     }
 269   }
 270   return moved;
 271 }
 272
 273 int DesktopBackgroundController::GetBackgroundContainerId(bool locked) {
 274   return locked ? kShellWindowId_LockScreenBackgroundContainer
 275                 : kShellWindowId_DesktopBackgroundContainer;
 276 }
 277
 278 void DesktopBackgroundController::UpdateWallpaper(bool clear_cache) {
 279   current_wallpaper_.reset(NULL);
 280   ash::Shell::GetInstance()->user_wallpaper_delegate()->UpdateWallpaper(
 281       clear_cache);
 282 }
 283
 284 }  // namespace ash