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/*
* Copyright 2021 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <compositionengine/Output.h>
#include <compositionengine/impl/planner/Flattener.h>
#include <compositionengine/impl/planner/LayerState.h>
#include <compositionengine/impl/planner/Predictor.h>
#include <utils/String16.h>
#include <utils/Vector.h>
#include <optional>
#include <string>
#include <unordered_map>
namespace android {
namespace renderengine {
class RenderEngine;
} // namespace renderengine
namespace compositionengine::impl::planner {
// This is the top level class for layer caching. It is responsible for
// heuristically determining the composition strategy of the current layer stack,
// and flattens inactive layers into an override buffer so it can be used
// as a more efficient representation of parts of the layer stack.
class Planner {
public:
Planner(renderengine::RenderEngine& renderengine);
void setDisplaySize(ui::Size);
// Updates the Planner with the current set of layers before a composition strategy is
// determined.
// The Planner will call to the Flattener to determine to:
// 1. Replace any cached sets with a newly available flattened cached set
// 2. Create a new cached set if possible
void plan(
compositionengine::Output::OutputLayersEnumerator<compositionengine::Output>&& layers);
// Updates the Planner with the current set of layers after a composition strategy is
// determined.
void reportFinalPlan(
compositionengine::Output::OutputLayersEnumerator<compositionengine::Output>&& layers);
// The planner will call to the Flattener to render any pending cached set.
// Rendering a pending cached set is optional: if the renderDeadline is not far enough in the
// future then the planner may opt to skip rendering the cached set.
void renderCachedSets(const OutputCompositionState& outputState,
std::optional<std::chrono::steady_clock::time_point> renderDeadline);
void dump(const Vector<String16>& args, std::string&);
private:
void dumpUsage(std::string&) const;
std::unordered_map<LayerId, LayerState> mPreviousLayers;
std::vector<const LayerState*> mCurrentLayers;
Predictor mPredictor;
Flattener mFlattener;
std::optional<Predictor::PredictedPlan> mPredictedPlan;
NonBufferHash mFlattenedHash = 0;
bool mPredictorEnabled = false;
};
} // namespace compositionengine::impl::planner
} // namespace android
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