Ask the desktop to bypass the compositor when in windowed fullscreen mode.

0001-Support-_NET_WM_BYPASS_COMPOSITOR.patch

From ea01627e138dae91a5401f735aa283376a2077f0 Mon Sep 17 00:00:00 2001
From: Aaron Paden <[email protected]>
Date: Sun, 31 Dec 2017 10:30:31 -0600
Subject: [PATCH] Support _NET_WM_BYPASS_COMPOSITOR

---
 gfx/common/x11_common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gfx/common/x11_common.c b/gfx/common/x11_common.c
index 3107da4aa8..79bdda05d0 100644
--- a/gfx/common/x11_common.c
+++ b/gfx/common/x11_common.c
@@ -68,8 +68,10 @@ unsigned g_x11_screen                       = 0;
 Colormap g_x11_cmap;
 Window   g_x11_win;
 
+const long _NET_WM_BYPASS_COMPOSITOR_HINT_ON = 1;
 static Atom XA_NET_WM_STATE;
 static Atom XA_NET_WM_STATE_FULLSCREEN;
+static Atom XA_NET_WM_BYPASS_COMPOSITOR;
 static Atom XA_NET_MOVERESIZE_WINDOW;
 
 static Atom g_x11_quit_atom;
@@ -113,6 +115,7 @@ void x11_windowed_fullscreen(Display *dpy, Window win)
 
    XA_NET_WM_STATE            = XInternAtom(dpy, "_NET_WM_STATE", False);
    XA_NET_WM_STATE_FULLSCREEN = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
+   XA_NET_WM_BYPASS_COMPOSITOR = XInternAtom(dpy, "_NET_WM_BYPASS_COMPOSITOR", False);
 
    xev.xclient.type           = ClientMessage;
    xev.xclient.send_event     = True;
@@ -125,6 +128,7 @@ void x11_windowed_fullscreen(Display *dpy, Window win)
    XSendEvent(dpy, DefaultRootWindow(dpy), False,
          SubstructureRedirectMask | SubstructureNotifyMask,
          &xev);
+   XChangeProperty(dpy, win, XA_NET_WM_BYPASS_COMPOSITOR, XA_CARDINAL, 32, PropModeReplace, (uint8_t *)&_NET_WM_BYPASS_COMPOSITOR_HINT_ON, 1);
 }
 
 /* Try to be nice to tiling WMs if possible. */
-- 
2.15.1