| // Copyright 2017 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_LOADER_IMAGE_ANIMATED_IMAGE_TRACKER_H_ |
| #define COBALT_LOADER_IMAGE_ANIMATED_IMAGE_TRACKER_H_ |
| |
| #include <map> |
| #include <string> |
| |
| #include "base/containers/small_map.h" |
| #include "base/threading/thread.h" |
| #include "cobalt/base/unused.h" |
| #include "cobalt/loader/image/image.h" |
| #include "url/gurl.h" |
| |
| namespace cobalt { |
| namespace loader { |
| namespace image { |
| |
| // This class maintains the list of all images that are being displayed |
| // at the current time. Whenever an animated image enters / exits the list, the |
| // playing status is updated hence decoding is turned on / off for it. |
| class AnimatedImageTracker { |
| public: |
| explicit AnimatedImageTracker( |
| base::ThreadPriority animated_image_decode_thread_priority); |
| ~AnimatedImageTracker(); |
| |
| // Updates the count of an image URL that is being displayed. |
| void IncreaseURLCount(const GURL& url); |
| void DecreaseURLCount(const GURL& url); |
| |
| // Record an actual animated image that is linked to its URL. |
| void RecordImage(const GURL& url, |
| loader::image::AnimatedImage* animated_image); |
| |
| // This indicates the update calls for the current frame have finished. All |
| // changes during two ProcessRecordedImages calls will be processed. It should |
| // be called at the end of a layout. |
| void ProcessRecordedImages(); |
| |
| // Clears the AnimatedImageTracker, releasing any tracked in-progress |
| // animations. |
| void Reset(); |
| |
| private: |
| void OnDisplayStart(loader::image::AnimatedImage* image); |
| void OnDisplayEnd(loader::image::AnimatedImage* image); |
| |
| typedef std::map<GURL, scoped_refptr<loader::image::AnimatedImage> > |
| URLToImageMap; |
| typedef std::map<GURL, int> URLToIntMap; |
| typedef base::small_map<std::map<GURL, base::Unused>, 1> URLSet; |
| |
| // The image decode thread is a thread created and owned by the |
| // AnimatedImageTracker, but used by the AnimatedImage decoders. |
| base::Thread animated_image_decode_thread_; |
| |
| URLToImageMap image_map_; |
| URLToIntMap previous_url_counts_; |
| URLToIntMap current_url_counts_; |
| URLSet playing_urls_; |
| |
| // Used to ensure that all AnimatedImageTracker methods are called on the |
| // same thread (*not* |animated_image_decode_thread_|), the thread that we |
| // were constructed on. |
| THREAD_CHECKER(thread_checker_); |
| }; |
| |
| } // namespace image |
| } // namespace loader |
| } // namespace cobalt |
| |
| #endif // COBALT_LOADER_IMAGE_ANIMATED_IMAGE_TRACKER_H_ |