1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright (C) 2010 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 <gui/DisplayEventReceiver.h>
#include <utils/Looper.h>
using namespace android;
int receiver(int fd, int events, void* data)
{
DisplayEventReceiver* q = (DisplayEventReceiver*)data;
ssize_t n;
DisplayEventReceiver::Event buffer[1];
static nsecs_t oldTimeStamp = 0;
while ((n = q->getEvents(buffer, 1)) > 0) {
for (int i=0 ; i<n ; i++) {
if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
printf("event vsync: count=%d\t", buffer[i].vsync.count);
}
if (oldTimeStamp) {
float t = float(buffer[i].header.timestamp - oldTimeStamp) / s2ns(1);
printf("%f ms (%f Hz)\n", t*1000, 1.0/t);
}
oldTimeStamp = buffer[i].header.timestamp;
}
}
if (n<0) {
printf("error reading events (%s)\n", strerror(-n));
}
return 1;
}
int main(int argc, char** argv)
{
DisplayEventReceiver myDisplayEvent;
sp<Looper> loop = new Looper(false);
loop->addFd(myDisplayEvent.getFd(), 0, ALOOPER_EVENT_INPUT, receiver,
&myDisplayEvent);
myDisplayEvent.setVsyncRate(1);
do {
//printf("about to poll...\n");
int32_t ret = loop->pollOnce(-1);
switch (ret) {
case ALOOPER_POLL_WAKE:
//("ALOOPER_POLL_WAKE\n");
break;
case ALOOPER_POLL_CALLBACK:
//("ALOOPER_POLL_CALLBACK\n");
break;
case ALOOPER_POLL_TIMEOUT:
printf("ALOOPER_POLL_TIMEOUT\n");
break;
case ALOOPER_POLL_ERROR:
printf("ALOOPER_POLL_TIMEOUT\n");
break;
default:
printf("ugh? poll returned %d\n", ret);
break;
}
} while (1);
return 0;
}
|
