system/hwc3/DrmSwapchain.h

/*
 * Copyright (C) 2023 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_DRMSWAPCHAIN_H
#define ANDROID_HWC_DRMSWAPCHAIN_H

#include <android-base/unique_fd.h>

#include "Common.h"
#include "DrmClient.h"

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

class DrmSwapchain {
   public:
    class Image {
       public:
        Image() = delete;
        ~Image();
        int wait();
        void markAsInUse(::android::base::unique_fd useCompleteFenceFd);
        const native_handle_t* getBuffer();
        const std::shared_ptr<DrmBuffer> getDrmBuffer();
        Image(Image&& other);

       private:
        Image(const native_handle_t*, std::shared_ptr<DrmBuffer>);
        const native_handle_t* mBuffer = nullptr;
        std::shared_ptr<DrmBuffer> mDrmBuffer;
        ::android::base::unique_fd mLastUseFenceFd;

        friend class DrmSwapchain;
    };

    static std::unique_ptr<DrmSwapchain> create(uint32_t width, uint32_t height, uint32_t usage,
                                                DrmClient* client, uint32_t numImages = 3);
    Image* getNextImage();

   private:
    DrmSwapchain(std::vector<Image> images);
    std::vector<Image> mImages;
    uint32_t mLastUsedIndex = 0;
};

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

#endif