From 9bce2367142c266c1a1512494a03495583964c32 Mon Sep 17 00:00:00 2001
From: Dudemanguy <random342@airmail.cc>
Date: Wed, 12 Aug 2020 09:51:51 -0500
Subject: wayland: expose wayland-app-id as a user option

This is extremely similar to x11's WM_CLASS. This commit allows users to
set mpv's app-id at runtime for any of the wayland backends.
---
 DOCS/man/options.rst       |  4 ++++
 options/options.c          |  1 +
 options/options.h          |  1 +
 video/out/wayland_common.c | 14 ++++++++++++++
 4 files changed, 20 insertions(+)

diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index de4eb08d87..5245e18cae 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -5338,6 +5338,10 @@ The following video options are currently all specific to ``--vo=gpu`` and
 
     Currently only relevant for ``--gpu-api=d3d11``.
 
+``--wayland-app-id=<string>``
+    Set the client app id for Wayland-based video output methods. By default, "mpv"
+    is used.
+
 ``--wayland-disable-vsync=<yes|no>``
     Disable vsync for the wayland contexts (default: no). Useful for benchmarking
     the wayland context when combined with ``video-sync=display-desync``,
diff --git a/options/options.c b/options/options.c
index 1e104e886f..6e22de0a07 100644
--- a/options/options.c
+++ b/options/options.c
@@ -124,6 +124,7 @@ static const m_option_t mp_vo_opt_list[] = {
     {"window-maximized", OPT_FLAG(window_maximized)},
     {"force-window-position", OPT_FLAG(force_window_position)},
     {"x11-name", OPT_STRING(winname)},
+    {"wayland-app-id", OPT_STRING(appid)},
     {"monitoraspect", OPT_FLOAT(force_monitor_aspect), M_RANGE(0.0, 9.0)},
     {"monitorpixelaspect", OPT_FLOAT(monitor_pixel_aspect),
         M_RANGE(1.0/32.0, 32.0)},
diff --git a/options/options.h b/options/options.h
index ea5ece65a1..00b58dfbff 100644
--- a/options/options.h
+++ b/options/options.h
@@ -23,6 +23,7 @@ typedef struct mp_vo_opts {
     int screen_id;
     int fsscreen_id;
     char *winname;
+    char *appid;
     int x11_netwm;
     int x11_bypass_compositor;
     int native_keyrepeat;
diff --git a/video/out/wayland_common.c b/video/out/wayland_common.c
index e00adac338..8e7d8bb7b0 100644
--- a/video/out/wayland_common.c
+++ b/video/out/wayland_common.c
@@ -1060,6 +1060,17 @@ static int create_xdg_surface(struct vo_wayland_state *wl)
     return 0;
 }
 
+static void update_app_id(struct vo_wayland_state *wl)
+{
+    if (!wl->xdg_toplevel)
+        return;
+    if (!wl->vo_opts->appid) {
+        wl->vo_opts->appid = talloc_strdup(wl->vo_opts, "mpv");
+        m_config_cache_write_opt(wl->vo_opts_cache, &wl->vo_opts->appid);
+    }
+    xdg_toplevel_set_app_id(wl->xdg_toplevel, wl->vo_opts->appid);
+}
+
 static void set_border_decorations(struct vo_wayland_state *wl, int state)
 {
     if (!wl->xdg_toplevel_decoration) {
@@ -1126,6 +1137,7 @@ int vo_wayland_init(struct vo *vo)
     /* Can't be initialized during registry due to multi-protocol dependence */
     if (create_xdg_surface(wl))
         return false;
+    update_app_id(wl);
 
     const char *xdg_current_desktop = getenv("XDG_CURRENT_DESKTOP");
     if (xdg_current_desktop != NULL && strstr(xdg_current_desktop, "GNOME"))
@@ -1511,6 +1523,8 @@ int vo_wayland_control(struct vo *vo, int *events, int request, void *arg)
                 toggle_maximized(wl);
             if (opt == &opts->border)
                 set_border_decorations(wl, opts->border);
+            if (opt == &opts->appid)
+                update_app_id(wl);
         }
         return VO_TRUE;
     }
-- 
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