<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Exchange Server">  <style></style> </head> <body> <font face="Arial, sans-serif" size="2"> <div>Hi All</div> <div>I wrote some code using libXrandr to check the current screen rotation state</div> <div> </div> <div><font face="Arial, sans-serif"><i>int CheckRotationState(Display * x11_dpy) {</i></font></div> <div><font face="Arial, sans-serif"><i>    Rotation current_rotation;</i></font></div> <div><font face="Arial, sans-serif"><i>    XRRScreenConfiguration *scrn_cfg;</i></font></div> <div><font face="Arial, sans-serif"><i>    scrn_cfg = XRRGetScreenInfo(x11_dpy, DefaultRootWindow(x11_dpy));</i></font></div> <div><font face="Arial, sans-serif"><i>    XRRConfigCurrentConfiguration (scrn_cfg, &current_rotation);</i></font></div> <div><font face="Arial, sans-serif"><i>    XRRFreeScreenConfigInfo(scrn_cfg);</i></font></div> <div><font face="Arial, sans-serif"><i>    return current_rotation;</i></font></div> <div><font face="Arial, sans-serif"><i>}</i></font></div> <div><font face="Arial, sans-serif"> </font></div> <div><font face="Arial, sans-serif"><i>CheckRotationState </i>is put ahead of <i>XvPutImage</i>,  that is to say every time I want to display an image, I will firstly check the screen rotation state. If the return value of <i>CheckRotationState </i>is <i>RR_Rotate_0(There isn't any rotation)</i>, I will use hardware overlay to display video, or I will use textured blit way. But I found the performance degraded a lot after add <i>CheckRotationState</i>. Seems that <i>XRRGetScreenInfo </i>consumes much time. I tried another interface <i>XRRRotations</i>, but can only get the cached information, not the current rotation state.</font></div> <div><font face="Arial, sans-serif">Does anyone have some good idea about how to get the screen rotation state from the Server efficiently? </font></div> <div><font face="Arial, sans-serif"> </font></div> <div><font face="Arial, sans-serif">Best Regards</font></div> <div><font face="宋体, sans-serif"> </font></div> </font> </body> </html>