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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 #include "chrome/browser/ui/webui/thumbnail_source.h"
      6 
      7 #include "base/callback.h"
      8 #include "chrome/browser/history/top_sites.h"
      9 #include "chrome/browser/profiles/profile.h"
     10 #include "chrome/common/url_constants.h"
     11 #include "googleurl/src/gurl.h"
     12 #include "grit/theme_resources.h"
     13 #include "ui/base/resource/resource_bundle.h"
     14 
     15 ThumbnailSource::ThumbnailSource(Profile* profile)
     16     : DataSource(chrome::kChromeUIThumbnailPath, MessageLoop::current()),
     17       // Set TopSites now as Profile isn't thread safe.
     18       top_sites_(profile->GetTopSites()) {
     19 }
     20 
     21 ThumbnailSource::~ThumbnailSource() {
     22 }
     23 
     24 void ThumbnailSource::StartDataRequest(const std::string& path,
     25                                        bool is_incognito,
     26                                        int request_id) {
     27   scoped_refptr<RefCountedBytes> data;
     28   if (top_sites_->GetPageThumbnail(GURL(path), &data)) {
     29     // We have the thumbnail.
     30     SendResponse(request_id, data.get());
     31   } else {
     32     SendDefaultThumbnail(request_id);
     33   }
     34 }
     35 
     36 std::string ThumbnailSource::GetMimeType(const std::string&) const {
     37   // We need to explicitly return a mime type, otherwise if the user tries to
     38   // drag the image they get no extension.
     39   return "image/png";
     40 }
     41 
     42 MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
     43     const std::string& path) const {
     44   // TopSites can be accessed from the IO thread.
     45   return top_sites_.get() ? NULL : DataSource::MessageLoopForRequestPath(path);
     46 }
     47 
     48 void ThumbnailSource::SendDefaultThumbnail(int request_id) {
     49   // Use placeholder thumbnail.
     50   if (!default_thumbnail_.get()) {
     51     default_thumbnail_ =
     52         ResourceBundle::GetSharedInstance().LoadDataResourceBytes(
     53             IDR_DEFAULT_THUMBNAIL);
     54   }
     55   SendResponse(request_id, default_thumbnail_);
     56 }
     57