From 990d12479029ed22ffa04218583f1d433bea7c50 Mon Sep 17 00:00:00 2001
From: Daniels Umanovskis <du@axentia.se>
Date: Wed, 26 Oct 2022 10:25:43 +0200
Subject: [PATCH] ximagesink, xvimagesink: set the _NET_WM_PID atom on the
 window

This makes it easier for X11 window management to work with windows created by these sinks

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3267>
---
 subprojects/gst-plugins-base/sys/ximage/ximagesink.c | 9 +++++++++
 subprojects/gst-plugins-base/sys/xvimage/xvcontext.c | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/subprojects/gst-plugins-base/sys/ximage/ximagesink.c b/subprojects/gst-plugins-base/sys/ximage/ximagesink.c
index 6b1b487923..4fd9070538 100644
--- a/subprojects/gst-plugins-base/sys/ximage/ximagesink.c
+++ b/subprojects/gst-plugins-base/sys/ximage/ximagesink.c
@@ -112,6 +112,9 @@
 /* Debugging category */
 #include <gst/gstinfo.h>
 
+/* For getpid */
+#include <unistd.h>
+
 /* for XkbKeycodeToKeysym */
 #include <X11/XKBlib.h>
 
@@ -433,6 +436,12 @@ gst_x_image_sink_xwindow_set_title (GstXImageSink * ximagesink,
         XSetClassHint (ximagesink->xcontext->disp, xwindow->win, hint);
       }
       XFree (hint);
+
+      unsigned long pid = getpid ();
+      Atom _NET_WM_PID =
+          XInternAtom (ximagesink->xcontext->disp, "_NET_WM_PID", 0);
+      XChangeProperty (ximagesink->xcontext->disp, xwindow->win,
+          _NET_WM_PID, _NET_WM_PID, 32, 0, (unsigned char *) &pid, 1);
     }
   }
 }
diff --git a/subprojects/gst-plugins-base/sys/xvimage/xvcontext.c b/subprojects/gst-plugins-base/sys/xvimage/xvcontext.c
index fbaee4e309..75bebd9887 100644
--- a/subprojects/gst-plugins-base/sys/xvimage/xvcontext.c
+++ b/subprojects/gst-plugins-base/sys/xvimage/xvcontext.c
@@ -30,6 +30,9 @@
 /* Debugging category */
 #include <gst/gstinfo.h>
 
+/* for getpid */
+#include <unistd.h>
+
 /* for XkbKeycodeToKeysym */
 #include <X11/XKBlib.h>
 
@@ -1039,6 +1042,11 @@ gst_xvcontext_create_xwindow (GstXvContext * context, gint width, gint height)
     g_free (hints);
   }
 
+  unsigned long pid = getpid ();
+  Atom _NET_WM_PID = XInternAtom (context->disp, "_NET_WM_PID", 0);
+  XChangeProperty (context->disp, window->win,
+      _NET_WM_PID, _NET_WM_PID, 32, 0, (unsigned char *) &pid, 1);
+
   window->gc = XCreateGC (context->disp, window->win, 0, NULL);
 
   XMapRaised (context->disp, window->win);