chrome/browser/ui/webui/ntp/thumbnail_source.cc

   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_frame_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 }