/*
 * Copyright (c) Hisilicon Technologies Co., Ltd.. 2016-2019. All rights reserved.
 * Description: hwc add support for vsync
 * Author: Hisilicon
 * Created: 2016.08.12
 */
#include"VsyncLoopThread.h"
#include <cutils/properties.h>
#include <log/log.h>
#include "HWCIapiAdapter.h"
namespace android {
VsyncLoopThread::VsyncLoopThread(HWCDisplay &display) :mDisplay(display)
{
}

VsyncLoopThread::~VsyncLoopThread()
{
}

bool VsyncLoopThread::threadLoop()
{
    int fd = mDisplay.GetFrameBufferFd();
    if (fd < 0) {
        ALOGE("VsyncLoopThread framebuffer fd is invalid: %d", fd);
        return false;
    }

    bool fakeVsync = property_get_bool("vendor.gfx.hwc.fake.vsync", false);
    int64_t curTimeStamp = 0;
    unsigned int freshRate = 0;
    while (TRUE) {
        if (fakeVsync) {
            freshRate = NORMAL_FRESH_PER_SECOND;
            usleep(SIXTY_HZ_OF_TIME);
            curTimeStamp = systemTime(SYSTEM_TIME_MONOTONIC);
        } else {
            // avoid to invoke ioctl cmd too frequently although it is blocking call
            // and DELAY_FRESH_TIME 5000us is abitrary value and less than the fastest fresh time
            usleep(DELAY_FRESH_TIME);
            curTimeStamp = HWCIapiAdapter::GetInstance().GetVsyncTime(fd, freshRate);
            if (curTimeStamp == HWC_INVALID_VSYNC_TIME) {
                ALOGE("Wait VBlank failed, try again");
                continue;
            }
        }
        mDisplay.Vsync(curTimeStamp, freshRate);
    }
    return false;
}
} // namespace android