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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_UI_WEBUI_THUMBNAIL_SOURCE_H_
      6 #define CHROME_BROWSER_UI_WEBUI_THUMBNAIL_SOURCE_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/ref_counted_memory.h"
     14 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
     15 
     16 class Profile;
     17 
     18 namespace history {
     19 class TopSites;
     20 }
     21 
     22 // ThumbnailSource is the gateway between network-level chrome: requests for
     23 // thumbnails and the history/top-sites backend that serves these.
     24 class ThumbnailSource : public ChromeURLDataManager::DataSource {
     25  public:
     26   explicit ThumbnailSource(Profile* profile);
     27 
     28   // Called when the network layer has requested a resource underneath
     29   // the path we registered.
     30   virtual void StartDataRequest(const std::string& path,
     31                                 bool is_incognito,
     32                                 int request_id);
     33 
     34   virtual std::string GetMimeType(const std::string& path) const;
     35 
     36   virtual MessageLoop* MessageLoopForRequestPath(const std::string& path) const;
     37 
     38  private:
     39   virtual ~ThumbnailSource();
     40 
     41   // Send the default thumbnail when we are missing a real one.
     42   void SendDefaultThumbnail(int request_id);
     43 
     44   // Raw PNG representation of the thumbnail to show when the thumbnail
     45   // database doesn't have a thumbnail for a webpage.
     46   scoped_refptr<RefCountedMemory> default_thumbnail_;
     47 
     48   // TopSites.
     49   scoped_refptr<history::TopSites> top_sites_;
     50 
     51   DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
     52 };
     53 
     54 #endif  // CHROME_BROWSER_UI_WEBUI_THUMBNAIL_SOURCE_H_
     55