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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/thumbnails/thumbnail_service_impl.h"
#include "base/command_line.h"
#include "base/memory/ref_counted_memory.h"
#include "base/time/time.h"
#include "chrome/browser/history/history_utils.h"
#include "chrome/browser/history/top_sites_factory.h"
#include "chrome/browser/thumbnails/content_based_thumbnailing_algorithm.h"
#include "chrome/browser/thumbnails/simple_thumbnail_crop.h"
#include "chrome/browser/thumbnails/thumbnailing_context.h"
#include "chrome/common/chrome_switches.h"
#include "components/search/search.h"
#include "content/public/browser/browser_thread.h"
#include "url/gurl.h"
using content::BrowserThread;
namespace {
// The thumbnail size in DIP.
const int kThumbnailWidth = 212;
const int kThumbnailHeight = 142;
// True if thumbnail retargeting feature is enabled (Finch/flags).
bool IsThumbnailRetargetingEnabled() {
if (!search::IsInstantExtendedAPIEnabled())
return false;
return base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableThumbnailRetargeting);
}
void AddForcedURLOnUIThread(scoped_refptr<history::TopSites> top_sites,
const GURL& url) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (top_sites)
top_sites->AddForcedURL(url, base::Time::Now());
}
} // namespace
namespace thumbnails {
ThumbnailServiceImpl::ThumbnailServiceImpl(Profile* profile)
: top_sites_(TopSitesFactory::GetForProfile(profile)),
use_thumbnail_retargeting_(IsThumbnailRetargetingEnabled()) {
}
ThumbnailServiceImpl::~ThumbnailServiceImpl() {
}
bool ThumbnailServiceImpl::SetPageThumbnail(const ThumbnailingContext& context,
const gfx::Image& thumbnail) {
scoped_refptr<history::TopSites> local_ptr(top_sites_);
if (!local_ptr)
return false;
return local_ptr->SetPageThumbnail(context.url, thumbnail, context.score);
}
bool ThumbnailServiceImpl::GetPageThumbnail(
const GURL& url,
bool prefix_match,
scoped_refptr<base::RefCountedMemory>* bytes) {
scoped_refptr<history::TopSites> local_ptr(top_sites_);
if (!local_ptr)
return false;
return local_ptr->GetPageThumbnail(url, prefix_match, bytes);
}
void ThumbnailServiceImpl::AddForcedURL(const GURL& url) {
scoped_refptr<history::TopSites> local_ptr(top_sites_);
if (!local_ptr)
return;
// Adding
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(AddForcedURLOnUIThread, local_ptr, url));
}
ThumbnailingAlgorithm* ThumbnailServiceImpl::GetThumbnailingAlgorithm()
const {
const gfx::Size thumbnail_size(kThumbnailWidth, kThumbnailHeight);
if (use_thumbnail_retargeting_)
return new ContentBasedThumbnailingAlgorithm(thumbnail_size);
return new SimpleThumbnailCrop(thumbnail_size);
}
bool ThumbnailServiceImpl::ShouldAcquirePageThumbnail(const GURL& url) {
scoped_refptr<history::TopSites> local_ptr(top_sites_);
if (!local_ptr)
return false;
// Skip if the given URL is not appropriate for history.
if (!CanAddURLToHistory(url))
return false;
// Skip if the top sites list is full, and the URL is not known.
if (local_ptr->IsNonForcedFull() && !local_ptr->IsKnownURL(url))
return false;
// Skip if we don't have to udpate the existing thumbnail.
ThumbnailScore current_score;
if (local_ptr->GetPageThumbnailScore(url, ¤t_score) &&
!current_score.ShouldConsiderUpdating())
return false;
// Skip if we don't have to udpate the temporary thumbnail (i.e. the one
// not yet saved).
ThumbnailScore temporary_score;
if (local_ptr->GetTemporaryPageThumbnailScore(url, &temporary_score) &&
!temporary_score.ShouldConsiderUpdating())
return false;
return true;
}
void ThumbnailServiceImpl::ShutdownOnUIThread() {
// Since each call uses its own scoped_refptr, we can just clear the reference
// here by assigning null. If another call is completed, it added its own
// reference.
top_sites_ = NULL;
}
} // namespace thumbnails
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