system/hwc2/Composer.h

/*
 * Copyright (C) 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.
 */

#ifndef ANDROID_HWC_COMPOSER_H
#define ANDROID_HWC_COMPOSER_H

#include <android-base/unique_fd.h>

#include <functional>
#include <tuple>
#include <unordered_map>
#include <vector>

#include "Common.h"

namespace android {
class Device;
class Display;

class Composer {
 public:
  virtual ~Composer() {}

  using HotplugCallback = std::function<void(
      bool /*connected*/, uint32_t /*id*/, uint32_t /*width*/,
      uint32_t /*height*/, uint32_t /*dpiX*/, uint32_t /*dpiY*/,
      uint32_t /*refreshRate*/)>;

  virtual HWC2::Error init() = 0;

  virtual HWC2::Error onDisplayCreate(Display* display) = 0;

  virtual HWC2::Error onDisplayDestroy(Display* display) = 0;

  virtual HWC2::Error onDisplayClientTargetSet(Display* display) = 0;

  // Determines if this composer can compose the given layers and requests
  // changes for layers that can't not be composed.
  virtual HWC2::Error validateDisplay(
      Display* display, std::unordered_map<hwc2_layer_t, HWC2::Composition>*
                            outLayerCompositionChanges) = 0;

  // Performs the actual composition of layers and presents the composed result
  // to the display.
  virtual std::tuple<HWC2::Error, base::unique_fd> presentDisplay(
      Display* display) = 0;
  virtual HWC2::Error onActiveConfigChange(Display* display) = 0;
};

}  // namespace android

#endif