/*
 * Copyright (C) 2015 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.
 */

#define LOG_TAG "hwc-drm-compositor-worker"

#include "drmcompositorworker.h"
#include "drmdisplaycompositor.h"
#include "utils/worker.h"

#include <stdlib.h>

#include <hardware/hardware.h>
#include <log/log.h>

namespace android {

DrmCompositorWorker::DrmCompositorWorker(DrmDisplayCompositor* compositor)
    : Worker("drm-compositor", HAL_PRIORITY_URGENT_DISPLAY), compositor_(compositor) {}

DrmCompositorWorker::~DrmCompositorWorker() {}

int DrmCompositorWorker::Init() {
    bSchedFifoOnce_ = false;
    return InitWorker();
}

void DrmCompositorWorker::Routine() {
    int ret;

    // 需要将此线程设置为实时线程，为了让底层调用CPU计时器可以获得更准确的计时
    // 所有平台的提交线程需要设置为实时线程
    if (bSchedFifoOnce_ == false) {
        bSchedFifoOnce_ = true;
        static constexpr int kFifoPriority = 2;
        struct sched_param param = {0};
        int sched_policy;
        sched_policy = SCHED_FIFO;
        param.sched_priority = kFifoPriority;

        if (sched_setscheduler(0, sched_policy, &param) != 0) {
            HWC2_LOGE("DrmCompositorWorker set SCHED_FIFO fail!");
        } else {
            HWC2_LOGI("DrmCompositorWorker set SCHED_FIFO success!");
        }
    }

    if (!compositor_->IsSidebandMode() && !compositor_->IsMemcMode()) {
        if (!compositor_->HaveQueuedComposites()) {
            Lock();
            int wait_ret = WaitForSignalOrExitLocked(kWaitTimeOut_);
            Unlock();

            switch (wait_ret) {
                case 0:
                    break;
                case -EINTR:
                    return;
                //close pre-comp for static screen.
                case -ETIMEDOUT:
                    kWaitTimeOut_ = kWaitTimeOut_ * 2 > 500000000LL ? 500000000LL : kWaitTimeOut_ * 2;
                    return;
                default:
                    ALOGE("Failed to wait for signal, %d", wait_ret);
                    return;
            }
        }
    }

    kWaitTimeOut_ = 2000000LL;

    ret = compositor_->Composite();
    if (ret) ALOGE("Failed to composite! %d", ret);
}
}  // namespace android