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      1 // Copyright 2013 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_UI_APP_LIST_SEARCH_COMMON_URL_ICON_SOURCE_H_
      6 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_COMMON_URL_ICON_SOURCE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "chrome/browser/image_decoder.h"
     13 #include "net/url_request/url_fetcher_delegate.h"
     14 #include "ui/gfx/image/image_skia.h"
     15 #include "ui/gfx/image/image_skia_source.h"
     16 #include "url/gurl.h"
     17 
     18 namespace net {
     19 class URLFetcher;
     20 class URLRequestContextGetter;
     21 }
     22 
     23 namespace app_list {
     24 
     25 // An ImageSkiaSource for icons fetched from a URL. Till the URL icon is
     26 // fetched, the default icon (specified by it's resource id) is shown.
     27 class UrlIconSource : public gfx::ImageSkiaSource,
     28                       public net::URLFetcherDelegate,
     29                       public ImageDecoder::Delegate {
     30  public:
     31   typedef base::Closure IconLoadedCallback;
     32 
     33   // Create a URL Icon source with the given URL. The post_process parameter
     34   // specifies a function to post-process the result icon before displaying it.
     35   UrlIconSource(const IconLoadedCallback& icon_loaded_callback,
     36                 net::URLRequestContextGetter* context_getter,
     37                 const GURL& icon_url,
     38                 int icon_size,
     39                 int default_icon_resource_id);
     40   virtual ~UrlIconSource();
     41 
     42  private:
     43   // Invoked from GetImageForScale to download the app icon when the hosting
     44   // ImageSkia gets painted on screen.
     45   void StartIconFetch();
     46 
     47   // gfx::ImageSkiaSource overrides:
     48   virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE;
     49 
     50   // net::URLFetcherDelegate overrides:
     51   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
     52 
     53   // ImageDecoder::Delegate overrides:
     54   virtual void OnImageDecoded(const ImageDecoder* decoder,
     55                               const SkBitmap& decoded_image) OVERRIDE;
     56   virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE;
     57 
     58   IconLoadedCallback icon_loaded_callback_;
     59   net::URLRequestContextGetter* context_getter_;
     60   const GURL icon_url_;
     61   const int icon_size_;
     62   const int default_icon_resource_id_;
     63 
     64   bool icon_fetch_attempted_;
     65   scoped_ptr<net::URLFetcher> icon_fetcher_;
     66 
     67   scoped_refptr<ImageDecoder> image_decoder_;
     68 
     69   gfx::ImageSkia icon_;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(UrlIconSource);
     72 };
     73 
     74 }  // namespace app_list
     75 
     76 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_COMMON_URL_ICON_SOURCE_H_
     77