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      1 // Copyright (c) 2010 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 #pragma once
      8 
      9 #include <map>
     10 #include <set>
     11 #include <string>
     12 
     13 #include "base/basictypes.h"
     14 #include "chrome/browser/extensions/image_loading_tracker.h"
     15 #include "third_party/skia/include/core/SkBitmap.h"
     16 #include "ui/gfx/insets.h"
     17 
     18 class Extension;
     19 
     20 class ExtensionIconManager : public ImageLoadingTracker::Observer {
     21  public:
     22   ExtensionIconManager();
     23   virtual ~ExtensionIconManager();
     24 
     25   // Start loading the icon for the given extension.
     26   void LoadIcon(const Extension* extension);
     27 
     28   // This returns a bitmap of width/height kFaviconSize, loaded either from an
     29   // entry specified in the extension's 'icon' section of the manifest, or a
     30   // default extension icon.
     31   const SkBitmap& GetIcon(const std::string& extension_id);
     32 
     33   // Removes the extension's icon from memory.
     34   void RemoveIcon(const std::string& extension_id);
     35 
     36   // Implements the ImageLoadingTracker::Observer interface.
     37   virtual void OnImageLoaded(SkBitmap* image, const ExtensionResource& resource,
     38                              int index);
     39 
     40   void set_monochrome(bool value) { monochrome_ = value; }
     41   void set_padding(const gfx::Insets& value) { padding_ = value; }
     42 
     43  private:
     44   // Makes sure we've done one-time initialization of the default extension icon
     45   // default_icon_.
     46   void EnsureDefaultIcon();
     47 
     48   // Helper function to return a copy of |src| with the proper scaling and
     49   // coloring.
     50   SkBitmap ApplyTransforms(const SkBitmap& src);
     51 
     52   // Used for loading extension icons.
     53   ImageLoadingTracker image_tracker_;
     54 
     55   // Maps extension id to an SkBitmap with the icon for that extension.
     56   std::map<std::string, SkBitmap> icons_;
     57 
     58   // Set of extension IDs waiting for icons to load.
     59   std::set<std::string> pending_icons_;
     60 
     61   // The default icon we'll use if an extension doesn't have one.
     62   SkBitmap default_icon_;
     63 
     64   // If true, we will desaturate the icons to make them monochromatic.
     65   bool monochrome_;
     66 
     67   // Specifies the amount of empty padding to place around the icon.
     68   gfx::Insets padding_;
     69 
     70   DISALLOW_COPY_AND_ASSIGN(ExtensionIconManager);
     71 };
     72 
     73 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
     74