services/surfaceflinger/CompositionEngine/include/compositionengine/CompositionEngine.h

/*
 * Copyright 2018 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 <TimeStats/TimeStats.h>
#include <utils/Timers.h>
#include <memory>

#include "Feature.h"

namespace android {

class HWComposer;

namespace renderengine {
class RenderEngine;
} // namespace renderengine

namespace compositionengine {

class Display;

struct CompositionRefreshArgs;
struct DisplayCreationArgs;
struct LayerCreationArgs;
struct LayerFECompositionState;

/**
 * Encapsulates all the interfaces and implementation details for performing
 * display output composition.
 */
class CompositionEngine {
public:
    virtual ~CompositionEngine();

    // Create a composition Display
    virtual std::shared_ptr<Display> createDisplay(const DisplayCreationArgs&) = 0;
    virtual std::unique_ptr<compositionengine::LayerFECompositionState>
    createLayerFECompositionState() = 0;

    virtual HWComposer& getHwComposer() const = 0;
    virtual void setHwComposer(std::unique_ptr<HWComposer>) = 0;

    virtual renderengine::RenderEngine& getRenderEngine() const = 0;
    virtual void setRenderEngine(renderengine::RenderEngine*) = 0;

    virtual TimeStats* getTimeStats() const = 0;
    virtual void setTimeStats(const std::shared_ptr<TimeStats>&) = 0;

    virtual bool needsAnotherUpdate() const = 0;
    virtual nsecs_t getLastFrameRefreshTimestamp() const = 0;

    // Presents the indicated outputs
    virtual void present(CompositionRefreshArgs&) = 0;

    // Updates the cursor position for the indicated outputs.
    virtual void updateCursorAsync(CompositionRefreshArgs&) = 0;

    // TODO(b/121291683): These will become private/internal
    virtual void preComposition(CompositionRefreshArgs&) = 0;

    virtual FeatureFlags getFeatureFlags() const = 0;

    // Debugging
    virtual void dump(std::string&) const = 0;
};

} // namespace compositionengine
} // namespace android