yrzroger/DisplayEventTracker

DisplayEventTracker

作用

用于测试显示器事件(Display events)

1. vsync event
2. hotplug event
3. mode change event

使用方法

1. 放到android源码目录下，执行mm编译，得到可执行档DisplayEventTracker，adb push到测试板的/system/bin/下
2. 在console下执行DisplayEventTracker -h,可以查看简单的命令说明
   usage: DisplayEventTracker [options]
   ------------------------------------ options ---------------------------------------------
   [-i] vsync rate(default:1)
   [-h] help
   input 'r' to call requestNextVsync or input 'q' to exit when running
   ------------------------------------------------------------------------------------------
3. 示例命令
   DisplayEventTracker ：默认vsync rate = 1, 每个vsync到来时都会收到该event
   DisplayEventTracker -i 3 : 表示vsync rate = 3, 每3个vsync才会通知一次
   DisplayEventTracker -i 0 : 除非调用requestNextVsync，否则不会收到vsync event,此时可以输入‘r’来调用requestNextVsync

结果展示

$ DisplayEventTracker

Vsync received: count=12913
Vsync received: count=12914 16.683403 ms (59.939808 Hz)
Vsync received: count=12915 16.683403 ms (59.939808 Hz)
Vsync received: count=12916 16.683403 ms (59.939808 Hz)
Vsync received: count=12917 16.683403 ms (59.939808 Hz)
Vsync received: count=12918 16.683403 ms (59.939808 Hz)
Vsync received: count=12919 16.683403 ms (59.939808 Hz)

$ DisplayEventTracker -i 0

r
Vsync received: count=13072
r
Vsync received: count=13074 613.709656 ms (1.629435 Hz)
r
Vsync received: count=13076 433.765442 ms (2.305393 Hz)
r
Vsync received: count=13078 433.765442 ms (2.305393 Hz)
r
Vsync received: count=13080 467.131989 ms (2.140723 Hz)
r
Vsync received: count=13082 433.765442 ms (2.305393 Hz)
r
Vsync received: count=13084 533.865173 ms (1.873132 Hz)