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linux-capture: Log warning when unable to query windows 

Checks whether window manager supports ewmh. Logs warning if ewmh is not
supported.

Closes jp9000/obs-studio#488
master
Lucian Poston 2015-11-14 00:34:32 -08:00 committed by jp9000
parent f32f65bb1f
commit c392164f03
2 changed files with 73 additions and 0 deletions
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72
plugins/linux-capture/xcompcap-helper.cpp
View File

@ -47,10 +47,82 @@ namespace XCompcap
return res;
}
// Specification for checking for ewmh support at
// http://standards.freedesktop.org/wm-spec/wm-spec-latest.html#idm140200472693600
bool ewmhIsSupported()
{
Display *display = disp();
Atom netSupportingWmCheck = XInternAtom(display,
"_NET_SUPPORTING_WM_CHECK", true);
Atom actualType;
int format = 0;
unsigned long num = 0, bytes = 0;
unsigned char *data = NULL;
Window ewmh_window = 0;
int status = XGetWindowProperty(
display,
DefaultRootWindow(display),
netSupportingWmCheck,
0L,
1L,
false,
XA_WINDOW,
&actualType,
&format,
&num,
&bytes,
&data);
if (status == Success) {
if (num > 0) {
ewmh_window = ((Window*)data)[0];
}
if (data) {
XFree(data);
data = NULL;
}
}
if (ewmh_window) {
status = XGetWindowProperty(
display,
ewmh_window,
netSupportingWmCheck,
0L,
1L,
false,
XA_WINDOW,
&actualType,
&format,
&num,
&bytes,
&data);
if (status != Success || num == 0 ||
ewmh_window != ((Window*)data)[0]) {
ewmh_window = 0;
}
if (status == Success && data) {
XFree(data);
}
}
return ewmh_window != 0;
}
std::list<Window> getTopLevelWindows()
{
std::list<Window> res;
if (!ewmhIsSupported()) {
blog(LOG_WARNING, "Unable to query window list "
"because window manager "
"does not support extended "
"window manager Hints");
return res;
}
Atom netClList = XInternAtom(disp(), "_NET_CLIENT_LIST", true);
Atom actualType;
int format;

1
plugins/linux-capture/xcompcap-helper.hpp
View File

@ -67,6 +67,7 @@ namespace XCompcap
int getRootWindowScreen(Window root);
std::string getWindowName(Window win);
int getWindowPid(Window win);
bool ewmhIsSupported();
std::list<Window> getTopLevelWindows();
std::list<Window> getAllWindows();