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      1 // Copyright (c) 2011 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 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
      7 
      8 #include <map>
      9 #include <set>
     10 #include <string>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/memory/weak_ptr.h"
     14 #include "third_party/skia/include/core/SkBitmap.h"
     15 #include "ui/gfx/insets.h"
     16 
     17 namespace content {
     18 class BrowserContext;
     19 }
     20 
     21 namespace extensions {
     22 class Extension;
     23 }
     24 
     25 namespace gfx {
     26 class Image;
     27 }
     28 
     29 class ExtensionIconManager {
     30  public:
     31   ExtensionIconManager();
     32   virtual ~ExtensionIconManager();
     33 
     34   // Start loading the icon for the given extension.
     35   void LoadIcon(content::BrowserContext* context,
     36                 const extensions::Extension* extension);
     37 
     38   // This returns a bitmap of width/height kFaviconSize, loaded either from an
     39   // entry specified in the extension's 'icon' section of the manifest, or a
     40   // default extension icon.
     41   const SkBitmap& GetIcon(const std::string& extension_id);
     42 
     43   // Removes the extension's icon from memory.
     44   void RemoveIcon(const std::string& extension_id);
     45 
     46   void set_monochrome(bool value) { monochrome_ = value; }
     47   void set_padding(const gfx::Insets& value) { padding_ = value; }
     48 
     49  protected:
     50   virtual void OnImageLoaded(const std::string& extension_id,
     51                              const gfx::Image& image);
     52 
     53  private:
     54   // Makes sure we've done one-time initialization of the default extension icon
     55   // default_icon_.
     56   void EnsureDefaultIcon();
     57 
     58   // Helper function to return a copy of |src| with the proper scaling and
     59   // coloring.
     60   SkBitmap ApplyTransforms(const SkBitmap& src);
     61 
     62   // Maps extension id to an SkBitmap with the icon for that extension.
     63   std::map<std::string, SkBitmap> icons_;
     64 
     65   // Set of extension IDs waiting for icons to load.
     66   std::set<std::string> pending_icons_;
     67 
     68   // The default icon we'll use if an extension doesn't have one.
     69   SkBitmap default_icon_;
     70 
     71   // If true, we will desaturate the icons to make them monochromatic.
     72   bool monochrome_;
     73 
     74   // Specifies the amount of empty padding to place around the icon.
     75   gfx::Insets padding_;
     76 
     77   base::WeakPtrFactory<ExtensionIconManager> weak_ptr_factory_;
     78 
     79   DISALLOW_COPY_AND_ASSIGN(ExtensionIconManager);
     80 };
     81 
     82 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
     83