src/chrome/browser/thumbnails/thumbnail_service_impl.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/thumbnails/thumbnail_service_impl.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/memory/ref_counted_memory.h"
   9 #include "chrome/browser/history/history_service.h"
  10 #include "chrome/browser/search/search.h"
  11 #include "chrome/browser/thumbnails/content_based_thumbnailing_algorithm.h"
  12 #include "chrome/browser/thumbnails/simple_thumbnail_crop.h"
  13 #include "chrome/browser/thumbnails/thumbnailing_context.h"
  14 #include "chrome/common/chrome_switches.h"
  15 #include "url/gurl.h"
  16
  17 namespace {
  18
  19 // The thumbnail size in DIP.
  20 const int kThumbnailWidth = 212;
  21 const int kThumbnailHeight = 132;
  22
  23 // True if thumbnail retargeting feature is enabled (Finch/flags).
  24 bool IsThumbnailRetargetingEnabled() {
  25   if (!chrome::IsInstantExtendedAPIEnabled())
  26     return false;
  27
  28   return CommandLine::ForCurrentProcess()->HasSwitch(
  29       switches::kEnableThumbnailRetargeting);
  30 }
  31
  32 }  // namespace
  33
  34 namespace thumbnails {
  35
  36 ThumbnailServiceImpl::ThumbnailServiceImpl(Profile* profile)
  37     : top_sites_(profile->GetTopSites()),
  38       use_thumbnail_retargeting_(IsThumbnailRetargetingEnabled()) {
  39 }
  40
  41 ThumbnailServiceImpl::~ThumbnailServiceImpl() {
  42 }
  43
  44 bool ThumbnailServiceImpl::SetPageThumbnail(const ThumbnailingContext& context,
  45                                             const gfx::Image& thumbnail) {
  46   scoped_refptr<history::TopSites> local_ptr(top_sites_);
  47   if (local_ptr.get() == NULL)
  48     return false;
  49
  50   return local_ptr->SetPageThumbnail(context.url, thumbnail, context.score);
  51 }
  52
  53 bool ThumbnailServiceImpl::GetPageThumbnail(
  54     const GURL& url,
  55     bool prefix_match,
  56     scoped_refptr<base::RefCountedMemory>* bytes) {
  57   scoped_refptr<history::TopSites> local_ptr(top_sites_);
  58   if (local_ptr.get() == NULL)
  59     return false;
  60
  61   return local_ptr->GetPageThumbnail(url, prefix_match, bytes);
  62 }
  63
  64 ThumbnailingAlgorithm* ThumbnailServiceImpl::GetThumbnailingAlgorithm()
  65     const {
  66   const gfx::Size thumbnail_size(kThumbnailWidth, kThumbnailHeight);
  67   if (use_thumbnail_retargeting_)
  68     return new ContentBasedThumbnailingAlgorithm(thumbnail_size);
  69   return new SimpleThumbnailCrop(thumbnail_size);
  70 }
  71
  72 bool ThumbnailServiceImpl::ShouldAcquirePageThumbnail(const GURL& url) {
  73   scoped_refptr<history::TopSites> local_ptr(top_sites_);
  74
  75   if (local_ptr.get() == NULL)
  76     return false;
  77
  78   // Skip if the given URL is not appropriate for history.
  79   if (!HistoryService::CanAddURL(url))
  80     return false;
  81   // Skip if the top sites list is full, and the URL is not known.
  82   if (local_ptr->IsFull() && !local_ptr->IsKnownURL(url))
  83     return false;
  84   // Skip if we don't have to udpate the existing thumbnail.
  85   ThumbnailScore current_score;
  86   if (local_ptr->GetPageThumbnailScore(url, &current_score) &&
  87       !current_score.ShouldConsiderUpdating())
  88     return false;
  89   // Skip if we don't have to udpate the temporary thumbnail (i.e. the one
  90   // not yet saved).
  91   ThumbnailScore temporary_score;
  92   if (local_ptr->GetTemporaryPageThumbnailScore(url, &temporary_score) &&
  93       !temporary_score.ShouldConsiderUpdating())
  94     return false;
  95
  96   return true;
  97 }
  98
  99 void ThumbnailServiceImpl::ShutdownOnUIThread() {
 100   // Since each call uses its own scoped_refptr, we can just clear the reference
 101   // here by assigning null. If another call is completed, it added its own
 102   // reference.
 103   top_sites_ = NULL;
 104 }
 105
 106 }  // namespace thumbnails