Load 2x resources on demand

ui/base/resource/resource_bundle.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 225 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateGetImageNamed);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateGetNativeImageNamed);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateLoadDataResourceBytes);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateGetRawDataResource);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateGetLocalizedString);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, DelegateGetFont);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, GetRawDataResource);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, LoadDataResourceBytes);
   FRIEND_TEST_ALL_PREFIXES(ResourceBundle, LocaleDataPakExists);
 
+  class ResourceBundleImageSource;
+  friend class ResourceBundleImageSource;
+
   // Ctor/dtor are private, since we're a singleton.
   explicit ResourceBundle(Delegate* delegate);
   ~ResourceBundle();
 
   // Free skia_images_.
   void FreeImages();
 
   // Load the main resources.
   void LoadCommonResources();
 
   // Try to load the locale specific strings from an external data module.
   // Returns the locale that is loaded.
   std::string LoadLocaleResources(const std::string& pref_locale);
 
   // Load test resources in given paths. If either path is empty an empty
   // resource pack is loaded.
   void LoadTestResources(const FilePath& path, const FilePath& locale_path);
 
   // Unload the locale specific strings and prepares to load new ones. See
   // comments for ReloadLocaleResources().
   void UnloadLocaleResources();
 
   // Initialize all the gfx::Font members if they haven't yet been initialized.
   void LoadFontsIfNecessary();
 
   // Creates and returns a new SkBitmap given the data file to look in and the
-  // resource id.  It's up to the caller to free the returned bitmap when
+  // |resource_id|.  It's up to the caller to free the returned bitmap when
   // done.
-  SkBitmap* LoadBitmap(const ResourceHandle& dll_inst, int resource_id);
+  SkBitmap* LoadBitmap(const ResourceHandle& dll_inst, int resource_id) const;
+
+  // Creates and returns a new SkBitmap for |resource_id| and |scale_factor|.
+  // Returns NULL if the resource does not exist.
+  SkBitmap* LoadBitmap(int resource_id, ScaleFactor scale_factor) const;
 
   // Returns an empty image for when a resource cannot be loaded. This is a
   // bright red bitmap.
   gfx::Image& GetEmptyImage();
 
   const FilePath& GetOverriddenPakPath();
 
   // This pointer is guaranteed to outlive the ResourceBundle instance and may
   // be NULL.
   Delegate* delegate_;
@@ skipping 18 matching lines @@
   // The various fonts used. Cached to avoid repeated GDI creation/destruction.
   scoped_ptr<gfx::Font> base_font_;
   scoped_ptr<gfx::Font> bold_font_;
   scoped_ptr<gfx::Font> small_font_;
   scoped_ptr<gfx::Font> medium_font_;
   scoped_ptr<gfx::Font> medium_bold_font_;
   scoped_ptr<gfx::Font> large_font_;
   scoped_ptr<gfx::Font> large_bold_font_;
   scoped_ptr<gfx::Font> web_font_;
 
-  static ResourceBundle* g_shared_instance_;
-
   FilePath overridden_pak_path_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceBundle);
 };
 
 }  // namespace ui
 
 // TODO(beng): Someday, maybe, get rid of this.
 using ui::ResourceBundle;
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_