Index: cc/tiles/checker_image_tracker.h |
diff --git a/cc/tiles/checker_image_tracker.h b/cc/tiles/checker_image_tracker.h |
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+// Copyright 2017 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 CC_TILES_CHECKER_IMAGE_TRACKER_H_ |
+#define CC_TILES_CHECKER_IMAGE_TRACKER_H_ |
+ |
+#include <unordered_map> |
+#include <vector> |
+ |
+#include "cc/base/cc_export.h" |
+#include "cc/playback/image_id.h" |
+#include "cc/tiles/image_controller.h" |
+#include "third_party/skia/include/core/SkImage.h" |
+ |
+namespace cc { |
+ |
+class CC_EXPORT CheckerImageTrackerClient { |
+ public: |
+ virtual ~CheckerImageTrackerClient() = default; |
+ |
+ virtual void NeedsInvalidationForCheckerImagedTiles() = 0; |
+}; |
+ |
+// CheckerImageTracker is used to track the set of images in a frame which are |
+// decoded asynchronously, using the ImageDecodeService, from the rasterization |
+// of tiles which depend on them. Once decoded, these images are stored for |
+// invalidation on the next sync tree. TakeImagesToInvalidateOnSyncTree will |
+// return this set and maintain a copy to keeps these images locked until the |
+// sync tree is activated. |
+// Note: It is illegal to call TakeImagesToInvalidateOnSyncTree for the next |
+// sync tree until the previous tree is activated. |
+class CC_EXPORT CheckerImageTracker { |
+ public: |
+ CheckerImageTracker(ImageController* image_controller, |
+ CheckerImageTrackerClient* client, |
+ bool enable_checker_imaging); |
+ ~CheckerImageTracker(); |
+ |
+ // Given the |images| for a tile, filters the images which will be deferred |
+ // asynchronously using the image decoded service, eliminating them from |
+ // |images| adds them to the |checkered_images| set, so they can be skipped |
+ // during the rasterization of this tile. |
+ // The entries remaining in |images| are for images for which a cached decode |
+ // from the image decode service is available, or which must be decoded before |
+ // before this tile can be rasterized. |
+ void FilterImagesForCheckeringForTile(std::vector<DrawImage>* images, |
+ ImageIdFlatSet* checkered_images, |
+ WhichTree tree); |
+ |
+ // Returns the set of images to invalidate on the sync tree. |
+ const ImageIdFlatSet& TakeImagesToInvalidateOnSyncTree(); |
+ |
+ void DidActivateSyncTree(); |
+ |
+ private: |
+ void DidFinishImageDecode(ImageId image_id, |
+ ImageController::ImageDecodeRequestId request_id); |
+ |
+ // Returns true if the decode for |image| will be deferred to the image decode |
+ // service and it should be be skipped during raster. |
+ bool ShouldCheckerImage(const sk_sp<const SkImage>& image, |
+ WhichTree tree) const; |
+ |
+ void ScheduleImageDecodeIfNecessary(const sk_sp<const SkImage>& image); |
+ |
+ ImageController* image_controller_; |
+ CheckerImageTrackerClient* client_; |
+ const bool enable_checker_imaging_; |
+ |
+ // A set of images which have been decoded and are pending invalidation for |
+ // raster on the checkered tiles. |
+ ImageIdFlatSet images_pending_invalidation_; |
+ |
+ // A set of images which were invalidated on the current sync tree. |
+ ImageIdFlatSet invalidated_images_on_current_sync_tree_; |
+ |
+ // A set of images which are currently pending decode from the image decode |
+ // service. |
+ // TODO(khushalsagar): This should be a queue that gets re-built each time we |
+ // do a PrepareTiles? See crbug.com/689184. |
+ ImageIdFlatSet pending_image_decodes_; |
+ |
+ // A set of images which have been decoded at least once from the |
+ // ImageDecodeService and should not be checkered again. |
+ // TODO(khushalsagar): Limit the size of this set. |
+ // TODO(khushalsagar): Plumb navigation changes here to reset this. See |
+ // crbug.com/693228. |
+ std::unordered_set<ImageId> images_decoded_once_; |
+ |
+ // A map of image id to image decode request id for images to be unlocked. |
+ std::unordered_map<ImageId, ImageController::ImageDecodeRequestId> |
+ image_id_to_decode_request_id_; |
+ |
+ base::WeakPtrFactory<CheckerImageTracker> weak_factory_; |
+}; |
+ |
+} // namespace cc |
+ |
+#endif // CC_TILES_CHECKER_IMAGE_TRACKER_H_ |