1 // Copyright 2017 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CC_TILES_CHECKER_IMAGE_TRACKER_H_
6 #define CC_TILES_CHECKER_IMAGE_TRACKER_H_
8 #include <unordered_map>
11 #include "base/optional.h"
12 #include "cc/cc_export.h"
13 #include "cc/paint/image_id.h"
14 #include "cc/tiles/image_controller.h"
15 #include "third_party/skia/include/core/SkImage.h"
19 class CC_EXPORT CheckerImageTrackerClient {
21 virtual ~CheckerImageTrackerClient() = default;
23 virtual void NeedsInvalidationForCheckerImagedTiles() = 0;
26 // CheckerImageTracker is used to track the set of images in a frame which are
27 // decoded asynchronously, using the ImageDecodeService, from the rasterization
28 // of tiles which depend on them. Once decoded, these images are stored for
29 // invalidation on the next sync tree. TakeImagesToInvalidateOnSyncTree will
30 // return this set and maintain a copy to keeps these images locked until the
31 // sync tree is activated.
32 // Note: It is illegal to call TakeImagesToInvalidateOnSyncTree for the next
33 // sync tree until the previous tree is activated.
34 class CC_EXPORT CheckerImageTracker {
36 // The priority type for a decode. Note we use int to specify a decreasing
37 // order of priority with higher values.
38 enum DecodeType : int {
39 // Priority for images on tiles being rasterized (visible or pre-paint).
41 // Lowest priority for images on tiles in pre-decode region. These are tiles
42 // which are beyond the pre-paint region, but have their images decoded.
48 struct CC_EXPORT ImageDecodeRequest {
49 ImageDecodeRequest(PaintImage paint_image, DecodeType type);
50 PaintImage paint_image;
54 CheckerImageTracker(ImageController* image_controller,
55 CheckerImageTrackerClient* client,
56 bool enable_checker_imaging,
57 size_t min_image_bytes_to_checker);
58 ~CheckerImageTracker();
60 // Returns true if the decode for |image| will be deferred to the image decode
61 // service and it should be be skipped during raster.
62 bool ShouldCheckerImage(const DrawImage& image, WhichTree tree);
64 // Provides a prioritized queue of images to decode.
65 using ImageDecodeQueue = std::vector<ImageDecodeRequest>;
66 void ScheduleImageDecodeQueue(ImageDecodeQueue image_decode_queue);
68 // Disables scheduling any decode work by the tracker.
69 void SetNoDecodesAllowed();
71 // The max decode priority type that is allowed to run.
72 void SetMaxDecodePriorityAllowed(DecodeType decode_type);
74 // Returns the set of images to invalidate on the sync tree.
75 const PaintImageIdFlatSet& TakeImagesToInvalidateOnSyncTree();
77 // Called when the sync tree is activated. Each call to
78 // TakeImagesToInvalidateOnSyncTree() must be followed by this when the
79 // invalidated sync tree is activated.
80 void DidActivateSyncTree();
82 // Called to reset the tracker state on navigation. This will release all
83 // cached images. Setting |can_clear_decode_policy_tracking| will also result
84 // in re-checkering any images already decoded by the tracker.
85 void ClearTracker(bool can_clear_decode_policy_tracking);
87 // Informs the tracker to not checker the given image. This can be used to opt
88 // out of the checkering behavior for certain images, such as ones that were
89 // decoded using the img.decode api.
90 // Note that if the image is already being checkered, then it will continue to
91 // do so. This call is meant to be issued prior to the image appearing during
93 void DisallowCheckeringForImage(const PaintImage& image);
95 void set_force_disabled(bool force_disabled) {
96 force_disabled_ = force_disabled;
99 void UpdateImageDecodingHints(
100 base::flat_map<PaintImage::Id, PaintImage::DecodingMode>
103 bool has_locked_decodes_for_testing() const {
104 return !image_id_to_decode_.empty();
107 int decode_priority_allowed_for_testing() const {
108 return decode_priority_allowed_;
110 bool no_decodes_allowed_for_testing() const {
111 return decode_priority_allowed_ == kNoDecodeAllowedPriority;
113 PaintImage::DecodingMode get_decoding_mode_hint_for_testing(
115 CHECK(decoding_mode_map_.find(id) != decoding_mode_map_.end());
116 return decoding_mode_map_[id];
120 static const int kNoDecodeAllowedPriority;
122 enum class DecodePolicy {
123 // The image can be decoded asynchronously from raster. When set, the image
124 // is always skipped during rasterization of content that includes this
125 // image until it has been decoded using the decode service.
127 // The image has been decoded asynchronously once and should now be
128 // synchronously rasterized with the content or the image has been
129 // permanently vetoed from being decoded async.
133 // Contains the information to construct a DrawImage from PaintImage when
134 // queuing the image decode.
136 DecodePolicy policy = DecodePolicy::SYNC;
137 SkFilterQuality filter_quality = kNone_SkFilterQuality;
138 SkSize scale = SkSize::MakeEmpty();
139 size_t frame_index = PaintImage::kDefaultFrameIndex;
142 // Wrapper to unlock an image decode requested from the ImageController on
144 class ScopedDecodeHolder {
146 ScopedDecodeHolder(ImageController* controller,
147 ImageController::ImageDecodeRequestId request_id)
148 : controller_(controller), request_id_(request_id) {}
149 ~ScopedDecodeHolder() { controller_->UnlockImageDecode(request_id_); }
152 ImageController* controller_;
153 ImageController::ImageDecodeRequestId request_id_;
155 DISALLOW_COPY_AND_ASSIGN(ScopedDecodeHolder);
158 void DidFinishImageDecode(PaintImage::Id image_id,
159 ImageController::ImageDecodeRequestId request_id,
160 ImageController::ImageDecodeResult result);
162 // Called when the next request in the |image_decode_queue_| should be
163 // scheduled with the image decode service.
164 void ScheduleNextImageDecode();
165 void UpdateDecodeState(const DrawImage& draw_image,
166 PaintImage::Id paint_image_id,
167 DecodeState* decode_state);
169 ImageController* image_controller_;
170 CheckerImageTrackerClient* client_;
171 const bool enable_checker_imaging_;
172 const size_t min_image_bytes_to_checker_;
174 // Disables checkering of all images if set. As opposed to
175 // |enable_checker_imaging_|, this setting can be toggled.
176 bool force_disabled_ = false;
178 // A set of images which have been decoded and are pending invalidation for
179 // raster on the checkered tiles.
180 PaintImageIdFlatSet images_pending_invalidation_;
182 // A set of images which were invalidated on the current sync tree.
183 PaintImageIdFlatSet invalidated_images_on_current_sync_tree_;
185 // The queue of images pending decode. We maintain a queue to ensure that the
186 // order in which images are decoded is aligned with the priority of the tiles
187 // dependent on these images.
188 ImageDecodeQueue image_decode_queue_;
190 // The max decode type that is allowed to run, if decodes are allowed to run.
191 int decode_priority_allowed_ = kNoDecodeAllowedPriority;
193 // The currently outstanding image decode that has been scheduled with the
194 // decode service. There can be only one outstanding decode at a time.
195 base::Optional<PaintImage> outstanding_image_decode_;
197 // A map of ImageId to its DecodePolicy.
198 std::unordered_map<PaintImage::Id, DecodeState> image_async_decode_state_;
200 // A map of image id to image decode request id for images to be unlocked.
201 std::unordered_map<PaintImage::Id, std::unique_ptr<ScopedDecodeHolder>>
204 base::flat_map<PaintImage::Id, PaintImage::DecodingMode> decoding_mode_map_;
206 base::WeakPtrFactory<CheckerImageTracker> weak_factory_;
208 DISALLOW_COPY_AND_ASSIGN(CheckerImageTracker);
213 #endif // CC_TILES_CHECKER_IMAGE_TRACKER_H_