82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/fb.h>
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#include "DisplayHardware/VSyncBarrier.h"
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#ifndef FBIO_WAITFORVSYNC
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#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
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#endif
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namespace android {
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// ---------------------------------------------------------------------------
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VSyncBarrier::VSyncBarrier() : mFd(-EINVAL) {
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#if HAS_WAITFORVSYNC
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mFd = open("/dev/graphics/fb0", O_RDWR);
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if (mFd < 0) {
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mFd = -errno;
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}
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// try to see if FBIO_WAITFORVSYNC is supported
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uint32_t crt = 0;
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int err = ioctl(mFd, FBIO_WAITFORVSYNC, &crt);
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if (err < 0) {
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close(mFd);
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mFd = -EINVAL;
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}
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#endif
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}
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VSyncBarrier::~VSyncBarrier() {
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if (mFd >= 0) {
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close(mFd);
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}
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}
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status_t VSyncBarrier::initCheck() const {
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return mFd < 0 ? mFd : status_t(NO_ERROR);
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}
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// this must be thread-safe
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status_t VSyncBarrier::wait(nsecs_t* timestamp) const {
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if (mFd < 0) {
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return mFd;
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}
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int err;
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uint32_t crt = 0;
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do {
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err = ioctl(mFd, FBIO_WAITFORVSYNC, &crt);
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} while (err<0 && errno==EINTR);
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if (err < 0) {
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return -errno;
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}
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// ideally this would come from the driver
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timestamp[0] = systemTime();
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return NO_ERROR;
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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