Revert of [Suggestions] Move ImageManager to the component

components/suggestions/image_manager.cc

-// Copyright 2014 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 "components/suggestions/image_manager.h"
-
-#include "base/bind.h"
-#include "components/suggestions/image_fetcher.h"
-#include "ui/gfx/codec/jpeg_codec.h"
-
-using leveldb_proto::ProtoDatabase;
-
-namespace {
-
-// From JPEG-encoded bytes to SkBitmap.
-SkBitmap* DecodeImage(const std::vector<unsigned char>& encoded_data) {
-  return gfx::JPEGCodec::Decode(&encoded_data[0], encoded_data.size());
-}
-
-}  // namespace
-
-namespace suggestions {
-
-ImageManager::ImageManager() : weak_ptr_factory_(this) {}
-
-ImageManager::ImageManager(scoped_ptr<ImageFetcher> image_fetcher,
-                           scoped_ptr<ProtoDatabase<ImageData> > database,
-                           const base::FilePath& database_dir)
-    : image_fetcher_(image_fetcher.Pass()),
-      database_(database.Pass()),
-      database_ready_(false),
-      weak_ptr_factory_(this) {
-  image_fetcher_->SetImageFetcherDelegate(this);
-  database_->Init(database_dir, base::Bind(&ImageManager::OnDatabaseInit,
-                                           weak_ptr_factory_.GetWeakPtr()));
-}
-
-ImageManager::~ImageManager() {}
-
-ImageManager::ImageCacheRequest::ImageCacheRequest() {}
-
-ImageManager::ImageCacheRequest::~ImageCacheRequest() {}
-
-void ImageManager::Initialize(const SuggestionsProfile& suggestions) {
-  image_url_map_.clear();
-  for (int i = 0; i < suggestions.suggestions_size(); ++i) {
-    const ChromeSuggestion& suggestion = suggestions.suggestions(i);
-    if (suggestion.has_thumbnail()) {
-      image_url_map_[GURL(suggestion.url())] = GURL(suggestion.thumbnail());
-    }
-  }
-}
-
-void ImageManager::GetImageForURL(
-    const GURL& url,
-    base::Callback<void(const GURL&, const SkBitmap*)> callback) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  // If |url| is not found in |image_url_map_|, then invoke |callback| with
-  // NULL since there is no associated image for this |url|.
-  GURL image_url;
-  if (!GetImageURL(url, &image_url)) {
-    callback.Run(url, NULL);
-    return;
-  }
-
-  // |database_| can be NULL if something went wrong in initialization.
-  if (database_.get() && !database_ready_) {
-    // Once database is initialized, it will serve pending requests from either
-    // cache or network.
-    QueueCacheRequest(url, image_url, callback);
-    return;
-  }
-
-  ServeFromCacheOrNetwork(url, image_url, callback);
-}
-
-void ImageManager::OnImageFetched(const GURL& url, const SkBitmap* bitmap) {
-  SaveImage(url, *bitmap);
-}
-
-bool ImageManager::GetImageURL(const GURL& url, GURL* image_url) {
-  std::map<GURL, GURL>::iterator it = image_url_map_.find(url);
-  if (it == image_url_map_.end()) return false;  // Not found.
-  *image_url = it->second;
-  return true;
-}
-
-void ImageManager::QueueCacheRequest(
-    const GURL& url, const GURL& image_url,
-    base::Callback<void(const GURL&, const SkBitmap*)> callback) {
-  // To be served when the database has loaded.
-  ImageCacheRequestMap::iterator it = pending_cache_requests_.find(url);
-  if (it == pending_cache_requests_.end()) {
-    ImageCacheRequest request;
-    request.url = url;
-    request.image_url = image_url;
-    request.callbacks.push_back(callback);
-    pending_cache_requests_[url] = request;
-  } else {
-    // Request already queued for this url.
-    it->second.callbacks.push_back(callback);
-  }
-}
-
-void ImageManager::ServeFromCacheOrNetwork(
-    const GURL& url, const GURL& image_url,
-    base::Callback<void(const GURL&, const SkBitmap*)> callback) {
-  // If there is a image available in memory, return it.
-  if (!ServeFromCache(url, callback)) {
-    image_fetcher_->StartOrQueueNetworkRequest(url, image_url, callback);
-  }
-}
-
-bool ImageManager::ServeFromCache(
-    const GURL& url,
-    base::Callback<void(const GURL&, const SkBitmap*)> callback) {
-  SkBitmap* bitmap = GetBitmapFromCache(url);
-  if (bitmap) {
-    callback.Run(url, bitmap);
-    return true;
-  }
-  return false;
-}
-
-SkBitmap* ImageManager::GetBitmapFromCache(const GURL& url) {
-  ImageMap::iterator image_iter = image_map_.find(url.spec());
-  if (image_iter != image_map_.end()) {
-    return &image_iter->second;
-  }
-  return NULL;
-}
-
-void ImageManager::SaveImage(const GURL& url, const SkBitmap& bitmap) {
-  // Update the image map.
-  image_map_.insert(std::make_pair(url.spec(), bitmap));
-
-  if (!database_ready_) return;
-
-  // Attempt to save a JPEG representation to the database. If not successful,
-  // the fetched bitmap will still be inserted in the cache, above.
-  std::vector<unsigned char> encoded_data;
-  if (EncodeImage(bitmap, &encoded_data)) {
-    // Save the resulting bitmap to the database.
-    ImageData data;
-    data.set_url(url.spec());
-    data.set_data(std::string(encoded_data.begin(), encoded_data.end()));
-    scoped_ptr<ProtoDatabase<ImageData>::KeyEntryVector> entries_to_save(
-        new ProtoDatabase<ImageData>::KeyEntryVector());
-    scoped_ptr<std::vector<std::string> > keys_to_remove(
-        new std::vector<std::string>());
-    entries_to_save->push_back(std::make_pair(data.url(), data));
-    database_->UpdateEntries(entries_to_save.Pass(), keys_to_remove.Pass(),
-                             base::Bind(&ImageManager::OnDatabaseSave,
-                                        weak_ptr_factory_.GetWeakPtr()));
-  }
-}
-
-void ImageManager::OnDatabaseInit(bool success) {
-  if (!success) {
-    DVLOG(1) << "Image database init failed.";
-    database_.reset();
-    ServePendingCacheRequests();
-    return;
-  }
-  database_->LoadEntries(base::Bind(&ImageManager::OnDatabaseLoad,
-                                    weak_ptr_factory_.GetWeakPtr()));
-}
-
-void ImageManager::OnDatabaseLoad(bool success,
-                                  scoped_ptr<ImageDataVector> entries) {
-  if (!success) {
-    DVLOG(1) << "Image database load failed.";
-    database_.reset();
-    ServePendingCacheRequests();
-    return;
-  }
-  database_ready_ = true;
-
-  LoadEntriesInCache(entries.Pass());
-  ServePendingCacheRequests();
-}
-
-void ImageManager::OnDatabaseSave(bool success) {
-  if (!success) {
-    DVLOG(1) << "Image database save failed.";
-    database_.reset();
-    database_ready_ = false;
-  }
-}
-
-void ImageManager::LoadEntriesInCache(scoped_ptr<ImageDataVector> entries) {
-  for (ImageDataVector::iterator it = entries->begin(); it != entries->end();
-       ++it) {
-    std::vector<unsigned char> encoded_data(it->data().begin(),
-                                            it->data().end());
-
-    scoped_ptr<SkBitmap> bitmap(DecodeImage(encoded_data));
-    if (bitmap.get()) {
-      image_map_.insert(std::make_pair(it->url(), *bitmap));
-    }
-  }
-}
-
-void ImageManager::ServePendingCacheRequests() {
-  for (ImageCacheRequestMap::iterator it = pending_cache_requests_.begin();
-       it != pending_cache_requests_.end(); ++it) {
-    const ImageCacheRequest& request = it->second;
-    for (CallbackVector::const_iterator callback_it = request.callbacks.begin();
-         callback_it != request.callbacks.end(); ++callback_it) {
-      ServeFromCacheOrNetwork(request.url, request.image_url, *callback_it);
-    }
-  }
-}
-
-// static
-bool ImageManager::EncodeImage(const SkBitmap& bitmap,
-                               std::vector<unsigned char>* dest) {
-  SkAutoLockPixels bitmap_lock(bitmap);
-  if (!bitmap.readyToDraw() || bitmap.isNull()) {
-    return false;
-  }
-  return gfx::JPEGCodec::Encode(
-      reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
-      gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), bitmap.height(),
-      bitmap.width() * bitmap.bytesPerPixel(), 100, dest);
-}
-
-}  // namespace suggestions