| // 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. |
| |
| #include "cc/tiles/checker_image_tracker.h" |
| |
| #include "base/bind.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/stl_util.h" |
| #include "base/trace_event/trace_event.h" |
| |
| namespace cc { |
| namespace { |
| // The minimum size of an image that we should consider checkering. |
| size_t kMinImageSizeToCheckerBytes = 512 * 1024; |
| |
| size_t SafeSizeOfImage(const SkImage* image) { |
| base::CheckedNumeric<size_t> checked_size = 4; |
| checked_size *= image->width(); |
| checked_size *= image->height(); |
| return checked_size.ValueOrDefault(std::numeric_limits<size_t>::max()); |
| } |
| |
| std::string ToString(PaintImage::Id paint_image_id, |
| SkImageId sk_image_id, |
| bool complete, |
| bool static_image, |
| bool fits_size_constraints, |
| bool is_multipart, |
| size_t size) { |
| std::ostringstream str; |
| str << "paint_image_id[" << paint_image_id << "] sk_image_id[" << sk_image_id |
| << "] complete[" << complete << "] static[" << static_image |
| << "], fits_size_constraints[" << fits_size_constraints << "], size[" |
| << size << "]" |
| << " is_multipart[" << is_multipart << "]"; |
| return str.str(); |
| } |
| |
| } // namespace |
| |
| // static |
| const int CheckerImageTracker::kNoDecodeAllowedPriority = -1; |
| |
| CheckerImageTracker::ImageDecodeRequest::ImageDecodeRequest( |
| PaintImage paint_image, |
| DecodeType type) |
| : paint_image(std::move(paint_image)), type(type) {} |
| |
| CheckerImageTracker::CheckerImageTracker(ImageController* image_controller, |
| CheckerImageTrackerClient* client, |
| bool enable_checker_imaging) |
| : image_controller_(image_controller), |
| client_(client), |
| enable_checker_imaging_(enable_checker_imaging), |
| weak_factory_(this) {} |
| |
| CheckerImageTracker::~CheckerImageTracker() = default; |
| |
| void CheckerImageTracker::SetNoDecodesAllowed() { |
| decode_priority_allowed_ = kNoDecodeAllowedPriority; |
| } |
| |
| void CheckerImageTracker::SetMaxDecodePriorityAllowed(DecodeType decode_type) { |
| DCHECK_GT(decode_type, kNoDecodeAllowedPriority); |
| DCHECK_GE(decode_type, decode_priority_allowed_); |
| DCHECK_LE(decode_type, DecodeType::kLast); |
| |
| if (decode_priority_allowed_ == decode_type) |
| return; |
| decode_priority_allowed_ = decode_type; |
| |
| // This will start the next decode if applicable. |
| ScheduleNextImageDecode(); |
| } |
| |
| void CheckerImageTracker::ScheduleImageDecodeQueue( |
| ImageDecodeQueue image_decode_queue) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::ScheduleImageDecodeQueue"); |
| // Only checker-imaged (async updated) images are decoded using the image |
| // decode service. If |enable_checker_imaging_| is false, no image should |
| // be checkered. |
| DCHECK(image_decode_queue.empty() || enable_checker_imaging_); |
| |
| #if DCHECK_IS_ON() |
| // The decodes in the queue should be prioritized correctly. |
| DecodeType type = DecodeType::kRaster; |
| for (const auto& image_request : image_decode_queue) { |
| DCHECK_GE(image_request.type, type); |
| type = image_request.type; |
| } |
| #endif |
| |
| image_decode_queue_ = std::move(image_decode_queue); |
| ScheduleNextImageDecode(); |
| } |
| |
| const PaintImageIdFlatSet& |
| CheckerImageTracker::TakeImagesToInvalidateOnSyncTree() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::TakeImagesToInvalidateOnSyncTree"); |
| DCHECK_EQ(invalidated_images_on_current_sync_tree_.size(), 0u) |
| << "Sync tree can not be invalidated more than once"; |
| |
| invalidated_images_on_current_sync_tree_.swap(images_pending_invalidation_); |
| images_pending_invalidation_.clear(); |
| return invalidated_images_on_current_sync_tree_; |
| } |
| |
| void CheckerImageTracker::DidActivateSyncTree() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::DidActivateSyncTree"); |
| for (auto image_id : invalidated_images_on_current_sync_tree_) |
| image_id_to_decode_.erase(image_id); |
| invalidated_images_on_current_sync_tree_.clear(); |
| } |
| |
| void CheckerImageTracker::ClearTracker(bool can_clear_decode_policy_tracking) { |
| // Unlock all images and tracking for images pending invalidation. The |
| // |images_invalidated_on_current_sync_tree_| will be cleared when the sync |
| // tree is activated. |
| // |
| // Note that we assume that any images with DecodePolicy::ASYNC, which may be |
| // checkered, are safe to stop tracking here and will either be re-checkered |
| // and invalidated when the decode completes or be invalidated externally. |
| // This is because the policy decision for checkering an image is based on |
| // inputs received from a PaintImage in the DisplayItemList. The policy chosen |
| // for a PaintImage should remain unchanged. |
| // If the external inputs for deciding the decode policy for an image change, |
| // they should be accompanied with an invalidation during paint. |
| image_id_to_decode_.clear(); |
| |
| if (can_clear_decode_policy_tracking) { |
| image_async_decode_state_.clear(); |
| } else { |
| // If we can't clear the decode policy, we need to make sure we still |
| // re-decode and checker images that were pending invalidation. |
| for (auto image_id : images_pending_invalidation_) { |
| auto it = image_async_decode_state_.find(image_id); |
| DCHECK(it != image_async_decode_state_.end()); |
| DCHECK_EQ(it->second.policy, DecodePolicy::SYNC); |
| it->second.policy = DecodePolicy::ASYNC; |
| } |
| } |
| images_pending_invalidation_.clear(); |
| } |
| |
| void CheckerImageTracker::DisallowCheckeringForImage(const PaintImage& image) { |
| image_async_decode_state_.insert( |
| std::make_pair(image.stable_id(), DecodeState())); |
| } |
| |
| void CheckerImageTracker::DidFinishImageDecode( |
| PaintImage::Id image_id, |
| ImageController::ImageDecodeRequestId request_id, |
| ImageController::ImageDecodeResult result) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::DidFinishImageDecode"); |
| TRACE_EVENT_ASYNC_END0("cc", "CheckerImageTracker::DeferImageDecode", |
| image_id); |
| |
| DCHECK_NE(ImageController::ImageDecodeResult::DECODE_NOT_REQUIRED, result); |
| DCHECK_EQ(outstanding_image_decode_.value().stable_id(), image_id); |
| outstanding_image_decode_.reset(); |
| |
| // The async decode state may have been cleared if the tracker was cleared |
| // before this decode could be finished. |
| auto it = image_async_decode_state_.find(image_id); |
| if (it == image_async_decode_state_.end()) { |
| DCHECK_EQ(image_id_to_decode_.count(image_id), 0u); |
| return; |
| } |
| |
| it->second.policy = DecodePolicy::SYNC; |
| images_pending_invalidation_.insert(image_id); |
| ScheduleNextImageDecode(); |
| client_->NeedsInvalidationForCheckerImagedTiles(); |
| } |
| |
| bool CheckerImageTracker::ShouldCheckerImage(const DrawImage& draw_image, |
| WhichTree tree) { |
| const PaintImage& image = draw_image.paint_image(); |
| PaintImage::Id image_id = image.stable_id(); |
| TRACE_EVENT1("cc", "CheckerImageTracker::ShouldCheckerImage", "image_id", |
| image_id); |
| |
| if (!enable_checker_imaging_) |
| return false; |
| |
| // If the image was invalidated on the current sync tree and the tile is |
| // for the active tree, continue checkering it on the active tree to ensure |
| // the image update is atomic for the frame. |
| if (invalidated_images_on_current_sync_tree_.count(image_id) != 0 && |
| tree == WhichTree::ACTIVE_TREE) { |
| return true; |
| } |
| |
| // If the image is pending invalidation, continue checkering it. All tiles |
| // for these images will be invalidated on the next pending tree. |
| if (images_pending_invalidation_.find(image_id) != |
| images_pending_invalidation_.end()) { |
| return true; |
| } |
| |
| auto insert_result = image_async_decode_state_.insert( |
| std::pair<PaintImage::Id, DecodeState>(image_id, DecodeState())); |
| auto it = insert_result.first; |
| if (insert_result.second) { |
| bool complete = |
| image.completion_state() == PaintImage::CompletionState::DONE; |
| bool static_image = |
| image.animation_type() == PaintImage::AnimationType::STATIC; |
| size_t size = SafeSizeOfImage(image.sk_image().get()); |
| bool fits_size_constraints = |
| size >= kMinImageSizeToCheckerBytes && |
| size <= image_controller_->image_cache_max_limit_bytes(); |
| |
| // The following conditions must be true for an image to be checkerable: |
| // |
| // 1) Complete: The data for the image should have been completely loaded. |
| // |
| // 2) Static: Animated images/video frames can not be checkered. |
| // |
| // 3) Size constraints: Small images for which the decode is expected to |
| // be fast and large images which would breach the image cache budget and |
| // go through the at-raster decode path are not checkered. |
| // |
| // 4) Multipart images: Multipart images can be used to display mjpg video |
| // frames, checkering which would cause each video frame to flash and |
| // therefore should not be checkered. |
| bool can_checker_image = complete && static_image && |
| fits_size_constraints && !image.is_multipart(); |
| if (can_checker_image) |
| it->second.policy = DecodePolicy::ASYNC; |
| |
| TRACE_EVENT2( |
| TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::CheckerImagingDecision", "can_checker_image", |
| can_checker_image, "image_params", |
| ToString(image_id, image.sk_image()->uniqueID(), complete, static_image, |
| fits_size_constraints, image.is_multipart(), size)); |
| } |
| |
| // Update the decode state from the latest image we have seen. Note that it |
| // is not necessary to perform this in the early out cases above since in |
| // each of those cases the image has already been decoded. |
| UpdateDecodeState(draw_image, image_id, &it->second); |
| |
| return it->second.policy == DecodePolicy::ASYNC; |
| } |
| |
| void CheckerImageTracker::UpdateDecodeState(const DrawImage& draw_image, |
| PaintImage::Id paint_image_id, |
| DecodeState* decode_state) { |
| // If the policy is not async then either we decoded this image already or |
| // we decided not to ever checker it. |
| if (decode_state->policy != DecodePolicy::ASYNC) |
| return; |
| |
| // If the decode is already in flight, then we will have to live with what we |
| // have now. |
| if (outstanding_image_decode_.has_value() && |
| outstanding_image_decode_.value().stable_id() == paint_image_id) { |
| return; |
| } |
| |
| // Choose the max scale and filter quality. This keeps the memory usage to the |
| // minimum possible while still increasing the possibility of getting a cache |
| // hit. |
| decode_state->scale = SkSize::Make( |
| std::max(decode_state->scale.fWidth, draw_image.scale().fWidth), |
| std::max(decode_state->scale.fHeight, draw_image.scale().fHeight)); |
| decode_state->filter_quality = |
| std::max(decode_state->filter_quality, draw_image.filter_quality()); |
| decode_state->color_space = draw_image.target_color_space(); |
| } |
| |
| void CheckerImageTracker::ScheduleNextImageDecode() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"), |
| "CheckerImageTracker::ScheduleNextImageDecode"); |
| // We can have only one outstanding decode pending completion with the decode |
| // service. We'll come back here when it is completed. |
| if (outstanding_image_decode_.has_value()) |
| return; |
| |
| if (image_decode_queue_.empty()) |
| return; |
| |
| // If scheduling decodes for this priority is not allowed right now, don't |
| // schedule them. We will come back here when the allowed priority changes. |
| if (image_decode_queue_.front().type > decode_priority_allowed_) |
| return; |
| |
| DrawImage draw_image; |
| while (!image_decode_queue_.empty()) { |
| auto candidate = std::move(image_decode_queue_.front().paint_image); |
| image_decode_queue_.erase(image_decode_queue_.begin()); |
| |
| // Once an image has been decoded, it can still be present in the decode |
| // queue (duplicate entries), or while an image is still being skipped on |
| // the active tree. Check if the image is still ASYNC to see if a decode is |
| // needed. |
| PaintImage::Id image_id = candidate.stable_id(); |
| auto it = image_async_decode_state_.find(image_id); |
| DCHECK(it != image_async_decode_state_.end()); |
| if (it->second.policy != DecodePolicy::ASYNC) |
| continue; |
| |
| draw_image = DrawImage(candidate, candidate.sk_image()->bounds(), |
| it->second.filter_quality, |
| SkMatrix::MakeScale(it->second.scale.width(), |
| it->second.scale.height()), |
| it->second.color_space); |
| outstanding_image_decode_.emplace(candidate); |
| break; |
| } |
| |
| // We either found an image to decode or we reached the end of the queue. If |
| // we couldn't find an image, we're done. |
| if (!outstanding_image_decode_.has_value()) { |
| DCHECK(image_decode_queue_.empty()); |
| return; |
| } |
| |
| PaintImage::Id image_id = outstanding_image_decode_.value().stable_id(); |
| DCHECK_EQ(image_id_to_decode_.count(image_id), 0u); |
| TRACE_EVENT_ASYNC_BEGIN0("cc", "CheckerImageTracker::DeferImageDecode", |
| image_id); |
| ImageController::ImageDecodeRequestId request_id = |
| image_controller_->QueueImageDecode( |
| draw_image, base::Bind(&CheckerImageTracker::DidFinishImageDecode, |
| weak_factory_.GetWeakPtr(), image_id)); |
| |
| image_id_to_decode_.emplace(image_id, base::MakeUnique<ScopedDecodeHolder>( |
| image_controller_, request_id)); |
| } |
| |
| } // namespace cc |