Use low resolution wallpapers for small screens

BUG=140336
TBR=jhawkins

Review URL: https://chromiumcodereview.appspot.com/10837089

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149915 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 300 insertions, 73 deletions

diff --git a/ash/desktop_background/desktop_background_controller.cc b/ash/desktop_background/desktop_background_controller.cc
index 022ca0b..3f9dcba 100644
--- a/ash/desktop_background/desktop_background_controller.cc
+++ b/ash/desktop_background/desktop_background_controller.cc
@@ -23,6 +23,10 @@
 
 namespace ash {
 namespace {
+
+const int kSmallWallpaperMaximalWidth = 1366;
+const int kSmallWallpaperMaximalHeight = 800;
+
 internal::RootWindowLayoutManager* GetRootWindowLayoutManager(
     aura::RootWindow* root_window) {
   return static_cast<internal::RootWindowLayoutManager*>(
@@ -32,11 +36,11 @@ internal::RootWindowLayoutManager* GetRootWindowLayoutManager(
 
 // Stores the current wallpaper data.
 struct DesktopBackgroundController::WallpaperData {
-  explicit WallpaperData(int index)
+  WallpaperData(int index, WallpaperResolution resolution)
       : wallpaper_index(index),
-        wallpaper_layout(GetWallpaperInfo(index).layout),
+        wallpaper_layout(GetWallpaperViewInfo(index, resolution).layout),
         wallpaper_image(*(ui::ResourceBundle::GetSharedInstance().GetImageNamed(
-            GetWallpaperInfo(index).id).ToImageSkia())) {
+            GetWallpaperViewInfo(index, resolution).id).ToImageSkia())) {
   }
   WallpaperData(WallpaperLayout layout, const gfx::ImageSkia& image)
       : wallpaper_index(-1),
@@ -54,7 +58,9 @@ class DesktopBackgroundController::WallpaperOperation
     : public base::RefCountedThreadSafe<
           DesktopBackgroundController::WallpaperOperation> {
  public:
-  explicit WallpaperOperation(int index) : index_(index) {
+  WallpaperOperation(int index, WallpaperResolution resolution)
+      : index_(index),
+        resolution_(resolution) {
   }
 
   static void Run(scoped_refptr<WallpaperOperation> wo) {
@@ -64,7 +70,7 @@ class DesktopBackgroundController::WallpaperOperation
   void LoadingWallpaper() {
     if (cancel_flag_.IsSet())
       return;
-    wallpaper_data_.reset(new WallpaperData(index_));
+    wallpaper_data_.reset(new WallpaperData(index_, resolution_));
   }
 
   void Cancel() {
@@ -85,7 +91,9 @@ class DesktopBackgroundController::WallpaperOperation
 
   scoped_ptr<WallpaperData> wallpaper_data_;
 
-  int index_;
+  const int index_;
+
+  const WallpaperResolution resolution_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperOperation);
 };
@@ -123,7 +131,17 @@ void DesktopBackgroundController::OnRootWindowAdded(
   switch (desktop_background_mode_) {
     case BACKGROUND_IMAGE:
       if (current_wallpaper_.get()) {
-        SetDesktopBackgroundImage(root_window);
+        gfx::Size root_window_size = root_window->GetHostSize();
+        int wallpaper_width = current_wallpaper_->wallpaper_image.width();
+        int wallpaper_height = current_wallpaper_->wallpaper_image.height();
+        // Loads a higher resolution wallpaper if needed.
+        if ((wallpaper_width < root_window_size.width() ||
+             wallpaper_height < root_window_size.height()) &&
+            current_wallpaper_->wallpaper_index != -1 &&
+            current_wallpaper_->wallpaper_layout != TILE)
+          SetDefaultWallpaper(current_wallpaper_->wallpaper_index, true);
+        else
+          SetDesktopBackgroundImage(root_window);
       } else {
         internal::CreateDesktopBackground(root_window);
       }
@@ -134,7 +152,8 @@ void DesktopBackgroundController::OnRootWindowAdded(
   }
 }
 
-void DesktopBackgroundController::SetDefaultWallpaper(int index) {
+void DesktopBackgroundController::SetDefaultWallpaper(int index,
+                                                      bool force_reload) {
   // We should not change background when index is invalid. For instance, at
   // login screen or stub_user login.
   if (index == ash::GetInvalidWallpaperIndex()) {
@@ -145,12 +164,23 @@ void DesktopBackgroundController::SetDefaultWallpaper(int index) {
     return;
   }
 
-  if (current_wallpaper_.get() && current_wallpaper_->wallpaper_index == index)
+  if (!force_reload && current_wallpaper_.get() &&
+      current_wallpaper_->wallpaper_index == index)
     return;
 
   CancelPendingWallpaperOperation();
 
-  wallpaper_op_ = new WallpaperOperation(index);
+  WallpaperResolution resolution = SMALL;
+  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  for (Shell::RootWindowList::iterator iter = root_windows.begin();
+       iter != root_windows.end(); ++iter) {
+    gfx::Size root_window_size = (*iter)->GetHostSize();
+    if (root_window_size.width() > kSmallWallpaperMaximalWidth ||
+        root_window_size.height() > kSmallWallpaperMaximalHeight)
+      resolution = LARGE;
+  }
+
+  wallpaper_op_ = new WallpaperOperation(index, resolution);
   base::WorkerPool::PostTaskAndReply(
       FROM_HERE,
       base::Bind(&WallpaperOperation::Run, wallpaper_op_),
diff --git a/ash/desktop_background/desktop_background_controller.h b/ash/desktop_background/desktop_background_controller.h
index b575654..813e338 100644
--- a/ash/desktop_background/desktop_background_controller.h
+++ b/ash/desktop_background/desktop_background_controller.h
@@ -71,8 +71,10 @@ class ASH_EXPORT DesktopBackgroundController {
   void OnRootWindowAdded(aura::RootWindow* root_window);
 
   // Loads default wallpaper at |index| asynchronously and sets to current
-  // wallpaper after loaded.
-  void SetDefaultWallpaper(int index);
+  // wallpaper after loaded. When |force_reload| is true, reload wallpaper
+  // for all root windows even if |index| is the same as current wallpaper. It
+  // must be true when a different resolution of current wallpaper is needed.
+  void SetDefaultWallpaper(int index, bool force_reload);
 
   // Sets the user selected custom wallpaper. Called when user selected a file
   // from file system or changed the layout of wallpaper.
diff --git a/ash/desktop_background/desktop_background_resources.cc b/ash/desktop_background/desktop_background_resources.cc
index 01f7f46..48a6dcf 100644
--- a/ash/desktop_background/desktop_background_resources.cc
+++ b/ash/desktop_background/desktop_background_resources.cc
@@ -23,210 +23,384 @@ const char* kWallpaperLayoutArrays[] = {
 const ash::WallpaperInfo kDefaultWallpapers[] = {
 #if !defined(GOOGLE_CHROME_BUILD)
     {
-        IDR_AURA_WALLPAPERS_ROMAINGUY_0,
+        {
+            IDR_AURA_WALLPAPERS_ROMAINGUY_0_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_ROMAINGUY_0_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_ROMAINGUY_0_THUMB,
-        ash::CENTER_CROPPED,
         "Romain Guy",
         "http://www.curious-creature.org"
     },
 #else
     {
-        IDR_AURA_WALLPAPERS_1_NATURE0,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE0_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE0_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE0_THUMB,
-        ash::CENTER_CROPPED,
         "Kathy Collins / Getty Images",
         "http://www.gettyimages.com"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE1,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE1_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE1_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE1_THUMB,
-        ash::CENTER_CROPPED,
         "Johannes van Donge",
         "http://www.diginature.nl"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE2,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE2_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE2_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE2_THUMB,
-        ash::CENTER_CROPPED,
         "Oleg Zhukov",
         "http://500px.com/eosboy"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE3,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE3_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE3_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE3_THUMB,
-        ash::CENTER_CROPPED,
         "Stefano Ronchi",
         "http://www.stefanoronchi.com"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE4,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE4_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE4_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE4_THUMB,
-        ash::CENTER_CROPPED,
         "Stefano Ronchi",
         "http://www.stefanoronchi.com"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE5,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE5_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE5_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE5_THUMB,
-        ash::CENTER_CROPPED,
         "Mario Moreno",
         "http://www.mariomorenophotography.com"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE6,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE6_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE6_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE6_THUMB,
-        ash::CENTER_CROPPED,
         "Walter Soestbergen",
         "http://www.waltersoestbergen.nl"
     },
     {
-        IDR_AURA_WALLPAPERS_1_NATURE7,
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE7_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_1_NATURE7_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_1_NATURE7_THUMB,
-        ash::CENTER_CROPPED,
         "Mark Bridger",
         "http://www.bridgephotography.co.uk"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE0,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE0_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE0_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE0_THUMB,
-        ash::CENTER_CROPPED,
         "Vitali Prokopenko",
         "http://www.vitphoto.com/"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE1,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE1_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE1_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE1_THUMB,
-        ash::CENTER_CROPPED,
         "Romain Guy",
         "http://www.curious-creature.org"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE2,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE2_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE2_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE2_THUMB,
-        ash::CENTER_CROPPED,
         "Mark Bridger",
         "http://www.bridgephotography.co.uk"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE3,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE3_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE3_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE3_THUMB,
-        ash::CENTER_CROPPED,
         "Mike Reyfman",
         "http://mikereyfman.com"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE4,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE4_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE4_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE4_THUMB,
-        ash::CENTER_CROPPED,
         "Mike Reyfman",
         "http://mikereyfman.com"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE5,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE5_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE5_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE5_THUMB,
-        ash::CENTER_CROPPED,
         "Mike Reyfman",
         "http://mikereyfman.com"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE6,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE6_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE6_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE6_THUMB,
-        ash::CENTER_CROPPED,
         "Mike Reyfman",
         "http://mikereyfman.com"
     },
     {
-        IDR_AURA_WALLPAPERS_2_LANDSCAPE7,
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE7_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_2_LANDSCAPE7_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_2_LANDSCAPE7_THUMB,
-        ash::CENTER_CROPPED,
         "Romain Guy",
         "http://www.curious-creature.org"
     },
     {
-        IDR_AURA_WALLPAPERS_3_URBAN0,
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN0_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN0_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_3_URBAN0_THUMB,
-        ash::CENTER_CROPPED,
         "Paulo FLOP",
         "http://500px.com/FLOP"
     },
     {
-        IDR_AURA_WALLPAPERS_3_URBAN1,
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN1_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN1_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_3_URBAN1_THUMB,
-        ash::CENTER_CROPPED,
         "Mike Reyfman",
         "http://mikereyfman.com"
     },
     {
-        IDR_AURA_WALLPAPERS_3_URBAN2,
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN2_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN2_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_3_URBAN2_THUMB,
-        ash::CENTER_CROPPED,
         "Neil Kremer",
         "http://lightshedimagery.smugmug.com"
     },
     {
-        IDR_AURA_WALLPAPERS_3_URBAN3,
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN3_LARGE,
+            ash::CENTER_CROPPED
+        },
+        {
+            IDR_AURA_WALLPAPERS_3_URBAN3_SMALL,
+            ash::CENTER
+        },
         IDR_AURA_WALLPAPERS_3_URBAN3_THUMB,
-        ash::CENTER_CROPPED,
         "Neil Kremer",
         "http://lightshedimagery.smugmug.com"
     },
 #endif
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT0,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT0_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT0_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT0_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT1,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT1_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT1_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT1_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT2,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT2_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT2_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT2_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT3,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT3_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT3_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT3_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT4,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT4_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT4_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT4_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT5,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT5_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT5_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT5_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT6,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT6_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT6_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT6_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
     },
     {
-        IDR_AURA_WALLPAPERS_5_GRADIENT7,
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT7_LARGE,
+            ash::TILE
+        },
+        {
+            IDR_AURA_WALLPAPERS_5_GRADIENT7_SMALL,
+            ash::TILE
+        },
         IDR_AURA_WALLPAPERS_5_GRADIENT7_THUMB,
-        ash::TILE,
         "Chromium",
         "http://www.chromium.org"
-    },
+    }
 };
 
 const int kWallpaperLayoutCount = arraysize(kWallpaperLayoutArrays);
@@ -294,4 +468,12 @@ const WallpaperInfo& GetWallpaperInfo(int index) {
   return kDefaultWallpapers[index];
 }
 
+const WallpaperViewInfo& GetWallpaperViewInfo(int index,
+                                              WallpaperResolution resolution) {
+  if (resolution == SMALL)
+    return kDefaultWallpapers[index].small;
+  else
+    return kDefaultWallpapers[index].large;
+}
+
 }  // namespace ash
diff --git a/ash/desktop_background/desktop_background_resources.h b/ash/desktop_background/desktop_background_resources.h
index 54cdf55..f9c99b5 100644
--- a/ash/desktop_background/desktop_background_resources.h
+++ b/ash/desktop_background/desktop_background_resources.h
@@ -19,10 +19,21 @@ enum WallpaperLayout {
   TILE,
 };
 
-struct ASH_EXPORT WallpaperInfo {
+enum WallpaperResolution {
+  LARGE,
+  SMALL
+};
+
+// Encapsulates wallpaper infomation needed by desktop background view.
+struct ASH_EXPORT WallpaperViewInfo {
   int id;
-  int thumb_id;
   WallpaperLayout layout;
+};
+
+struct ASH_EXPORT WallpaperInfo {
+  WallpaperViewInfo large;
+  WallpaperViewInfo small;
+  int thumb_id;
   // TODO(bshe): author member should be encoded to UTF16. We need to use i18n
   // string for this member after M19.
   const char* author;
@@ -39,6 +50,8 @@ ASH_EXPORT int GetNextWallpaperIndex(int index);
 ASH_EXPORT int GetSolidColorIndex();
 ASH_EXPORT int GetWallpaperCount();
 ASH_EXPORT const WallpaperInfo& GetWallpaperInfo(int index);
+ASH_EXPORT const WallpaperViewInfo& GetWallpaperViewInfo(int index,
+    WallpaperResolution resolution);
 
 }  // namespace ash