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      1 // Copyright (c) 2012 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/ntp/thumbnail_source.h"
      6 
      7 #include "base/callback.h"
      8 #include "base/memory/ref_counted_memory.h"
      9 #include "base/message_loop/message_loop.h"
     10 #include "chrome/browser/profiles/profile.h"
     11 #include "chrome/browser/search/instant_io_context.h"
     12 #include "chrome/browser/thumbnails/thumbnail_service.h"
     13 #include "chrome/browser/thumbnails/thumbnail_service_factory.h"
     14 #include "chrome/common/url_constants.h"
     15 #include "grit/theme_resources.h"
     16 #include "net/url_request/url_request.h"
     17 #include "ui/base/resource/resource_bundle.h"
     18 #include "url/gurl.h"
     19 
     20 using content::BrowserThread;
     21 
     22 // Set ThumbnailService now as Profile isn't thread safe.
     23 ThumbnailSource::ThumbnailSource(Profile* profile, bool capture_thumbnails)
     24     : thumbnail_service_(ThumbnailServiceFactory::GetForProfile(profile)),
     25       profile_(profile),
     26       capture_thumbnails_(capture_thumbnails) {
     27 }
     28 
     29 ThumbnailSource::~ThumbnailSource() {
     30 }
     31 
     32 std::string ThumbnailSource::GetSource() const {
     33   return capture_thumbnails_ ?
     34       chrome::kChromeUIThumbnailHost2 : chrome::kChromeUIThumbnailHost;
     35 }
     36 
     37 void ThumbnailSource::StartDataRequest(
     38     const std::string& path,
     39     int render_process_id,
     40     int render_view_id,
     41     const content::URLDataSource::GotDataCallback& callback) {
     42   scoped_refptr<base::RefCountedMemory> data;
     43   if (thumbnail_service_->GetPageThumbnail(GURL(path), capture_thumbnails_,
     44                                            &data)) {
     45     // We have the thumbnail.
     46     callback.Run(data.get());
     47   } else {
     48     callback.Run(default_thumbnail_.get());
     49   }
     50   if (capture_thumbnails_)
     51     thumbnail_service_->AddForcedURL(GURL(path));
     52 }
     53 
     54 std::string ThumbnailSource::GetMimeType(const std::string&) const {
     55   // We need to explicitly return a mime type, otherwise if the user tries to
     56   // drag the image they get no extension.
     57   return "image/png";
     58 }
     59 
     60 base::MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
     61     const std::string& path) const {
     62   // TopSites can be accessed from the IO thread.
     63   return thumbnail_service_.get() ?
     64       NULL : content::URLDataSource::MessageLoopForRequestPath(path);
     65 }
     66 
     67 bool ThumbnailSource::ShouldServiceRequest(
     68     const net::URLRequest* request) const {
     69   if (request->url().SchemeIs(chrome::kChromeSearchScheme))
     70     return InstantIOContext::ShouldServiceRequest(request);
     71   return URLDataSource::ShouldServiceRequest(request);
     72 }
     73