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52 lines
1.5 KiB
52 lines
1.5 KiB
4 months ago
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/*
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* Copyright (c) Hisilicon Technologies Co., Ltd.. 2016-2019. All rights reserved.
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* Description: hwc add support for vsync
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* Author: Hisilicon
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* Created: 2016.08.12
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*/
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#include"VsyncLoopThread.h"
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#include <cutils/properties.h>
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#include <log/log.h>
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#include "HWCIapiAdapter.h"
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namespace android {
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VsyncLoopThread::VsyncLoopThread(HWCDisplay &display) :mDisplay(display)
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{
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}
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VsyncLoopThread::~VsyncLoopThread()
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{
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}
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bool VsyncLoopThread::threadLoop()
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{
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int fd = mDisplay.GetFrameBufferFd();
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if (fd < 0) {
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ALOGE("VsyncLoopThread framebuffer fd is invalid: %d", fd);
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return false;
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}
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bool fakeVsync = property_get_bool("vendor.gfx.hwc.fake.vsync", false);
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int64_t curTimeStamp = 0;
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unsigned int freshRate = 0;
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while (TRUE) {
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if (fakeVsync) {
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freshRate = NORMAL_FRESH_PER_SECOND;
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usleep(SIXTY_HZ_OF_TIME);
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curTimeStamp = systemTime(SYSTEM_TIME_MONOTONIC);
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} else {
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// avoid to invoke ioctl cmd too frequently although it is blocking call
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// and DELAY_FRESH_TIME 5000us is abitrary value and less than the fastest fresh time
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usleep(DELAY_FRESH_TIME);
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curTimeStamp = HWCIapiAdapter::GetInstance().GetVsyncTime(fd, freshRate);
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if (curTimeStamp == HWC_INVALID_VSYNC_TIME) {
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ALOGE("Wait VBlank failed, try again");
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continue;
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}
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}
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mDisplay.Vsync(curTimeStamp, freshRate);
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}
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return false;
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}
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} // namespace android
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