system/hwc3/HostFrameComposer.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.
 */

#ifndef ANDROID_HWC_HOSTFRAMECOMPOSER_H
#define ANDROID_HWC_HOSTFRAMECOMPOSER_H

#include <android-base/unique_fd.h>

#include <optional>
#include <tuple>

#include "Common.h"
#include "DrmClient.h"
#include "DrmSwapchain.h"
#include "FrameComposer.h"
#include "HostConnection.h"

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

class HostFrameComposer : public FrameComposer {
   public:
    HostFrameComposer() = default;

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

    HostFrameComposer(HostFrameComposer&&) = delete;
    HostFrameComposer& operator=(HostFrameComposer&&) = delete;

    HWC3::Error init() override;

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

    HWC3::Error unregisterOnHotplugCallback() override;

    HWC3::Error onDisplayCreate(Display* display) override;

    HWC3::Error onDisplayDestroy(Display* display) override;

    HWC3::Error onDisplayClientTargetSet(Display* display) override;

    // Determines if this composer can compose the given layers on the given
    // display and requests changes for layers that can't not be composed.
    HWC3::Error validateDisplay(Display* display, DisplayChanges* outChanges) override;

    // Performs the actual composition of layers and presents the composed result
    // to the display.
    HWC3::Error presentDisplay(
        Display* display, ::android::base::unique_fd* outDisplayFence,
        std::unordered_map<int64_t, ::android::base::unique_fd>* outLayerFences) override;

    HWC3::Error onActiveConfigChange(Display* display) override;

    const DrmClient* getDrmPresenter() const override {
        if (mDrmClient) {
            return &*mDrmClient;
        }
        return nullptr;
    }

   private:
    HWC3::Error createHostComposerDisplayInfo(Display* display, uint32_t hostDisplayId);

    void post(HostConnection* hostCon, ExtendedRCEncoderContext* rcEnc, uint32_t hostDisplayId,
              buffer_handle_t h);

    bool mIsMinigbm = false;

    int mSyncDeviceFd = -1;

    struct HostComposerDisplayInfo {
        uint32_t hostDisplayId = 0;
        std::unique_ptr<DrmSwapchain> swapchain = {};
        // Drm info for the displays client target buffer.
        std::shared_ptr<DrmBuffer> clientTargetDrmBuffer;
    };

    std::unordered_map<int64_t, HostComposerDisplayInfo> mDisplayInfos;

    std::optional<DrmClient> mDrmClient;
};

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

#endif