system/hwc3/DrmClient.h

/*
 * Copyright 2022 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 <android-base/unique_fd.h>
#include <cutils/native_handle.h>

#include <memory>
#include <tuple>
#include <vector>

#include "Common.h"
#include "DrmAtomicRequest.h"
#include "DrmBuffer.h"
#include "DrmConnector.h"
#include "DrmCrtc.h"
#include "DrmDisplay.h"
#include "DrmEventListener.h"
#include "DrmMode.h"
#include "DrmPlane.h"
#include "DrmProperty.h"
#include "LruCache.h"
#include "aemu/base/synchronization/AndroidLock.h"

namespace aidl::android::hardware::graphics::composer3::impl {

class DrmClient {
   public:
    DrmClient() = default;
    ~DrmClient();

    DrmClient(const DrmClient&) = delete;
    DrmClient& operator=(const DrmClient&) = delete;

    DrmClient(DrmClient&&) = delete;
    DrmClient& operator=(DrmClient&&) = delete;

    HWC3::Error init();

    struct DisplayConfig {
        uint32_t id;
        uint32_t width;
        uint32_t height;
        uint32_t dpiX;
        uint32_t dpiY;
        uint32_t refreshRateHz;
    };

    HWC3::Error getDisplayConfigs(std::vector<DisplayConfig>* configs) const;

    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*/)>;

    HWC3::Error registerOnHotplugCallback(const HotplugCallback& cb);
    HWC3::Error unregisterOnHotplugCallback();

    uint32_t refreshRate() const { return mDisplays[0]->getRefreshRateUint(); }

    std::tuple<HWC3::Error, std::shared_ptr<DrmBuffer>> create(const native_handle_t* handle);

    std::tuple<HWC3::Error, ::android::base::unique_fd> flushToDisplay(
        int display, const std::shared_ptr<DrmBuffer>& buffer,
        ::android::base::borrowed_fd inWaitSyncFd);

    std::optional<std::vector<uint8_t>> getEdid(uint32_t id);

   private:
    using DrmPrimeBufferHandle = uint32_t;

    // Grant visibility to destroyDrmFramebuffer to DrmBuffer.
    friend class DrmBuffer;
    HWC3::Error destroyDrmFramebuffer(DrmBuffer* buffer);

    // Grant visibility for handleHotplug to DrmEventListener.
    bool handleHotplug();

    bool loadDrmDisplays();

    // Drm device.
    ::android::base::unique_fd mFd;

    mutable ::android::base::guest::ReadWriteLock mDisplaysMutex;
    std::vector<std::unique_ptr<DrmDisplay>> mDisplays;

    std::optional<HotplugCallback> mHotplugCallback;

    std::unique_ptr<DrmEventListener> mDrmEventListener;
};

}  // namespace aidl::android::hardware::graphics::composer3::impl