d0566bc26f
use gui/DisplayEvent to receive the events. Events are dispatched through a unix pipe, so the API is compatible with utils/Looper. see gui/DisplayEvent.h for more info. Bug: 1475048 Change-Id: Ia720f64d1b950328b47b22c6a86042e481d35f09
82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
|
|
* Copyright (C) 2011 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.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <utils/Errors.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <linux/fb.h>
|
|
|
|
#include "DisplayHardware/VSyncBarrier.h"
|
|
|
|
#ifndef FBIO_WAITFORVSYNC
|
|
#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
|
|
#endif
|
|
|
|
namespace android {
|
|
// ---------------------------------------------------------------------------
|
|
|
|
VSyncBarrier::VSyncBarrier() : mFd(-EINVAL) {
|
|
#if HAS_WAITFORVSYNC
|
|
mFd = open("/dev/graphics/fb0", O_RDWR);
|
|
if (mFd < 0) {
|
|
mFd = -errno;
|
|
}
|
|
// try to see if FBIO_WAITFORVSYNC is supported
|
|
uint32_t crt = 0;
|
|
int err = ioctl(mFd, FBIO_WAITFORVSYNC, &crt);
|
|
if (err < 0) {
|
|
close(mFd);
|
|
mFd = -EINVAL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
VSyncBarrier::~VSyncBarrier() {
|
|
if (mFd >= 0) {
|
|
close(mFd);
|
|
}
|
|
}
|
|
|
|
status_t VSyncBarrier::initCheck() const {
|
|
return mFd < 0 ? mFd : status_t(NO_ERROR);
|
|
}
|
|
|
|
// this must be thread-safe
|
|
status_t VSyncBarrier::wait(nsecs_t* timestamp) const {
|
|
if (mFd < 0) {
|
|
return mFd;
|
|
}
|
|
|
|
int err;
|
|
uint32_t crt = 0;
|
|
do {
|
|
err = ioctl(mFd, FBIO_WAITFORVSYNC, &crt);
|
|
} while (err<0 && errno==EINTR);
|
|
if (err < 0) {
|
|
return -errno;
|
|
}
|
|
// ideally this would come from the driver
|
|
timestamp[0] = systemTime();
|
|
return NO_ERROR;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
}; // namespace android
|