| // 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. |
| |
| #ifndef COMPONENTS_FAVICON_CORE_BROWSER_FAVICON_HANDLER_H_ |
| #define COMPONENTS_FAVICON_CORE_BROWSER_FAVICON_HANDLER_H_ |
| |
| #include <deque> |
| #include <map> |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/task/cancelable_task_tracker.h" |
| #include "components/favicon/core/favicon_url.h" |
| #include "components/favicon_base/favicon_callback.h" |
| #include "ui/gfx/favicon_size.h" |
| #include "ui/gfx/image/image.h" |
| #include "url/gurl.h" |
| |
| class FaviconClient; |
| class FaviconDriver; |
| class FaviconService; |
| class SkBitmap; |
| |
| namespace base { |
| class RefCountedMemory; |
| } |
| |
| // FaviconHandler works with FaviconDriver to fetch the specific type of |
| // favicon. |
| // |
| // FetchFavicon requests the favicon from the favicon service which in turn |
| // requests the favicon from the history database. At this point |
| // we only know the URL of the page, and not necessarily the url of the |
| // favicon. To ensure we handle reloading stale favicons as well as |
| // reloading a favicon on page reload we always request the favicon from |
| // history regardless of whether the active favicon is valid. |
| // |
| // After the navigation two types of events are delivered (which is |
| // first depends upon who is faster): notification from the history |
| // db on our request for the favicon |
| // (OnFaviconDataForInitialURLFromFaviconService), or a message from the |
| // renderer giving us the URL of the favicon for the page (SetFaviconURL). |
| // . If the history db has a valid up to date favicon for the page, we update |
| // the current page and use the favicon. |
| // . When we receive the favicon url if it matches that of the current page |
| // and the current page's favicon is set, we do nothing (everything is |
| // ok). |
| // . On the other hand if the database does not know the favicon for url, or |
| // the favicon is out date, or the URL from the renderer does not match that |
| // of the current page we proceed to DownloadFaviconOrAskHistory. Before we |
| // invoke DownloadFaviconOrAskHistory we wait until we've received both |
| // the favicon url and the callback from history. We wait to ensure we |
| // truly know both the favicon url and the state of the database. |
| // |
| // DownloadFaviconOrAskHistory does the following: |
| // . If we have a valid favicon, but it is expired we ask the renderer to |
| // download the favicon. |
| // . Otherwise we ask the history database to update the mapping from |
| // page url to favicon url and call us back with the favicon. Remember, it is |
| // possible for the db to already have the favicon, just not the mapping |
| // between page to favicon url. The callback for this is OnFaviconData. |
| // |
| // OnFaviconData either updates the favicon of the current page (if the |
| // db knew about the favicon), or requests the renderer to download the |
| // favicon. |
| // |
| // When the renderer downloads favicons, it considers the entire list of |
| // favicon candidates, if |download_largest_favicon_| is true, the largest |
| // favicon will be used, otherwise the one that best matches the preferred size |
| // is chosen (or the first one if there is no preferred size). Once the |
| // matching favicon has been determined, SetFavicon is called which updates |
| // the page's favicon and notifies the database to save the favicon. |
| |
| class FaviconHandler { |
| public: |
| enum Type { FAVICON, TOUCH, LARGE }; |
| |
| FaviconHandler(FaviconService* service, |
| FaviconClient* client, |
| FaviconDriver* driver, |
| Type handler_type, |
| bool download_largest_icon); |
| virtual ~FaviconHandler(); |
| |
| // Returns the bit mask of favicon_base::IconType based on the handler's type. |
| static int GetIconTypesFromHandlerType(Type icon_type); |
| |
| // Initiates loading the favicon for the specified url. |
| void FetchFavicon(const GURL& url); |
| |
| // Message Handler. Must be public, because also called from |
| // PrerenderContents. Collects the |image_urls| list. |
| void OnUpdateFaviconURL(const std::vector<favicon::FaviconURL>& candidates); |
| |
| // Processes the current image_urls_ entry, requesting the image from the |
| // history / download service. |
| void ProcessCurrentUrl(); |
| |
| // Message handler for ImageHostMsg_DidDownloadImage. Called when the image |
| // at |image_url| has been downloaded. |
| // |bitmaps| is a list of all the frames of the image at |image_url|. |
| // |original_bitmap_sizes| are the sizes of |bitmaps| before they were resized |
| // to the maximum bitmap size passed to DownloadFavicon(). |
| void OnDidDownloadFavicon( |
| int id, |
| const GURL& image_url, |
| const std::vector<SkBitmap>& bitmaps, |
| const std::vector<gfx::Size>& original_bitmap_sizes); |
| |
| // For testing. |
| const std::vector<favicon::FaviconURL>& image_urls() const { |
| return image_urls_; |
| } |
| |
| protected: |
| // These virtual methods make FaviconHandler testable and are overridden by |
| // TestFaviconHandler. |
| |
| // Asks the render to download favicon, returns the request id. |
| virtual int DownloadFavicon(const GURL& image_url, int max_bitmap_size); |
| |
| // Ask the favicon from history |
| virtual void UpdateFaviconMappingAndFetch( |
| const GURL& page_url, |
| const GURL& icon_url, |
| favicon_base::IconType icon_type, |
| const favicon_base::FaviconResultsCallback& callback, |
| base::CancelableTaskTracker* tracker); |
| |
| virtual void GetFaviconFromFaviconService( |
| const GURL& icon_url, |
| favicon_base::IconType icon_type, |
| const favicon_base::FaviconResultsCallback& callback, |
| base::CancelableTaskTracker* tracker); |
| |
| virtual void GetFaviconForURLFromFaviconService( |
| const GURL& page_url, |
| int icon_types, |
| const favicon_base::FaviconResultsCallback& callback, |
| base::CancelableTaskTracker* tracker); |
| |
| virtual void SetHistoryFavicons(const GURL& page_url, |
| const GURL& icon_url, |
| favicon_base::IconType icon_type, |
| const gfx::Image& image); |
| |
| // Returns true if the favicon should be saved. |
| virtual bool ShouldSaveFavicon(const GURL& url); |
| |
| private: |
| // For testing: |
| friend class FaviconTabHelperTest; |
| friend class TestFaviconHandler; |
| |
| // Represents an in progress download of an image from the renderer. |
| struct DownloadRequest { |
| DownloadRequest(); |
| ~DownloadRequest(); |
| |
| DownloadRequest(const GURL& url, |
| const GURL& image_url, |
| favicon_base::IconType icon_type); |
| |
| GURL url; |
| GURL image_url; |
| favicon_base::IconType icon_type; |
| }; |
| |
| // Used to track a candidate for the favicon. |
| struct FaviconCandidate { |
| FaviconCandidate(); |
| ~FaviconCandidate(); |
| |
| FaviconCandidate(const GURL& url, |
| const GURL& image_url, |
| const gfx::Image& image, |
| float score, |
| favicon_base::IconType icon_type); |
| |
| GURL url; |
| GURL image_url; |
| gfx::Image image; |
| float score; |
| favicon_base::IconType icon_type; |
| }; |
| |
| // Get the maximal icon size in pixels for a icon of type |icon_type| for the |
| // current platform. |
| static int GetMaximalIconSize(favicon_base::IconType icon_type); |
| |
| // See description above class for details. |
| void OnFaviconDataForInitialURLFromFaviconService(const std::vector< |
| favicon_base::FaviconRawBitmapResult>& favicon_bitmap_results); |
| |
| // If the favicon has expired, asks the renderer to download the favicon. |
| // Otherwise asks history to update the mapping between page url and icon |
| // url with a callback to OnFaviconData when done. |
| void DownloadFaviconOrAskFaviconService(const GURL& page_url, |
| const GURL& icon_url, |
| favicon_base::IconType icon_type); |
| |
| // See description above class for details. |
| void OnFaviconData(const std::vector<favicon_base::FaviconRawBitmapResult>& |
| favicon_bitmap_results); |
| |
| // Schedules a download for the specified entry. This adds the request to |
| // download_requests_. |
| int ScheduleDownload(const GURL& url, |
| const GURL& image_url, |
| favicon_base::IconType icon_type); |
| |
| // Updates |favicon_candidate_| and returns true if it is an exact match. |
| bool UpdateFaviconCandidate(const GURL& url, |
| const GURL& image_url, |
| const gfx::Image& image, |
| float score, |
| favicon_base::IconType icon_type); |
| |
| // Sets the image data for the favicon. |
| void SetFavicon(const GURL& url, |
| const GURL& icon_url, |
| const gfx::Image& image, |
| favicon_base::IconType icon_type); |
| |
| // Notifies |driver_| favicon available. See |
| // FaviconDriver::NotifyFaviconAvailable() for |is_active_favicon| in detail. |
| void NotifyFaviconAvailable( |
| const std::vector<favicon_base::FaviconRawBitmapResult>& |
| favicon_bitmap_results, |
| bool is_active_favicon); |
| void NotifyFaviconAvailable(const GURL& icon_url, |
| const gfx::Image& image, |
| bool is_active_favicon); |
| |
| // Return the current candidate if any. |
| favicon::FaviconURL* current_candidate() { |
| return (!image_urls_.empty()) ? &image_urls_.front() : NULL; |
| } |
| |
| // Returns whether the page's url changed since the favicon was requested. |
| bool PageChangedSinceFaviconWasRequested(); |
| |
| // Returns the preferred size of the image. 0 means no preference (any size |
| // will do). |
| int preferred_icon_size() const { |
| if (download_largest_icon_) |
| return 0; |
| return handler_type_ == FAVICON ? gfx::kFaviconSize : 0; |
| } |
| |
| // Sorts the entries in |image_urls_| by icon size in descending order. |
| // Additionally removes any entries whose sizes are all greater than the max |
| // allowed size. |
| void SortAndPruneImageUrls(); |
| |
| // Used for FaviconService requests. |
| base::CancelableTaskTracker cancelable_task_tracker_; |
| |
| // URL of the page we're requesting the favicon for. |
| GURL url_; |
| |
| // Whether we are waiting for data from the FaviconService. |
| bool waiting_for_favicon_service_data_; |
| |
| // Whether we got data back for the initial request to the FaviconService. |
| bool got_favicon_from_history_; |
| |
| // Whether the favicon is out of date or the favicon data in |
| // |history_results_| is known to be incomplete. If true, it means history |
| // knows about the favicon, but we need to download the favicon because the |
| // icon has expired or the data in the database is incomplete. |
| bool favicon_expired_or_incomplete_; |
| |
| // Requests to the renderer to download favicons. |
| typedef std::map<int, DownloadRequest> DownloadRequests; |
| DownloadRequests download_requests_; |
| |
| // The type of the current handler. |
| const Type handler_type_; |
| |
| // The combination of the supported icon types. |
| const int icon_types_; |
| |
| // Whether the largest icon should be downloaded. |
| const bool download_largest_icon_; |
| |
| // The prioritized favicon candidates from the page back from the renderer. |
| std::vector<favicon::FaviconURL> image_urls_; |
| |
| // The FaviconRawBitmapResults from history. |
| std::vector<favicon_base::FaviconRawBitmapResult> history_results_; |
| |
| // The FaviconService which implements favicon operations. May be null during |
| // testing. |
| FaviconService* service_; |
| |
| // The client which implements embedder-specific Favicon operations. |
| FaviconClient* client_; // weak |
| |
| // This handler's driver. |
| FaviconDriver* driver_; // weak |
| |
| // Best image we've seen so far. As images are downloaded from the page they |
| // are stored here. When there is an exact match, or no more images are |
| // available the favicon service and the current page are updated (assuming |
| // the image is for a favicon). |
| FaviconCandidate best_favicon_candidate_; |
| |
| DISALLOW_COPY_AND_ASSIGN(FaviconHandler); |
| }; |
| |
| #endif // COMPONENTS_FAVICON_CORE_BROWSER_FAVICON_HANDLER_H_ |