core: implement Linux.setTitle()

src/core/Linux.zig

@@ -49,8 +49,8 @@ backend: Backend,
 
 // these arrays are used as info messages to the user that some features are missing
 // please keep these up to date until we can remove them
-const MISSING_FEATURES_X11 = [_][]const u8{ "Resizing window", "Changing display mode", "VSync", "Setting window border/title/cursor" };
-const MISSING_FEATURES_WAYLAND = [_][]const u8{ "Changing display mode", "VSync", "Setting window border/title/cursor" };
+const MISSING_FEATURES_X11 = [_][]const u8{ "Resizing window", "Changing display mode", "VSync", "Setting window border/cursor" };
+const MISSING_FEATURES_WAYLAND = [_][]const u8{ "Changing display mode", "VSync", "Setting window border/cursor" };
 
 pub fn init(
     linux: *Linux,
@@ -128,8 +128,6 @@ pub fn init(
     // warn about incomplete features
     // TODO: remove this when linux is not missing major features
     try warnAboutIncompleteFeatures(linux.backend, &MISSING_FEATURES_X11, &MISSING_FEATURES_WAYLAND, options.allocator);
-
-    return;
 }
 
 pub fn deinit(linux: *Linux) void {
@@ -141,8 +139,6 @@ pub fn deinit(linux: *Linux) void {
         .wayland => linux.backend.wayland.deinit(linux),
         .x11 => linux.backend.x11.deinit(linux),
     }
-
-    return;
 }
 
 pub fn update(linux: *Linux) !void {
@@ -150,11 +146,19 @@ pub fn update(linux: *Linux) !void {
         .wayland => try linux.backend.wayland.update(linux),
         .x11 => try linux.backend.x11.update(linux),
     }
-    return;
 }
 
-pub fn setTitle(_: *Linux, _: [:0]const u8) void {
-    return;
+pub fn setTitle(linux: *Linux, title: [:0]const u8) void {
+    const new_title = linux.allocator.dupeZ(u8, title) catch {
+        log.err("Failed to reallocate memory for new window title", .{});
+        return;
+    };
+    linux.allocator.free(linux.title);
+    linux.title = new_title;
+    switch (linux.backend) {
+        .wayland => linux.backend.wayland.setTitle(linux.title),
+        .x11 => linux.backend.x11.setTitle(linux.title),
+    }
 }
 
 pub fn setDisplayMode(_: *Linux, _: DisplayMode) void {

src/core/linux/Wayland.zig

@@ -52,6 +52,7 @@ configured: bool = false,
 
 display: *c.wl_display,
 surface: *c.wl_surface,
+toplevel: *c.xdg_toplevel,
 interfaces: Interfaces,
 libwaylandclient: LibWaylandClient,
 
@@ -99,6 +100,7 @@ pub fn init(
             },
             .surface_descriptor = undefined,
             .surface = undefined,
+            .toplevel = undefined,
         },
     };
     var wl = &linux.backend.wayland;
@@ -138,13 +140,13 @@ pub fn init(
     }
 
     const xdg_surface = c.xdg_wm_base_get_xdg_surface(wl.interfaces.xdg_wm_base, wl.surface) orelse return error.UnableToCreateXdgSurface;
-    const toplevel = c.xdg_surface_get_toplevel(xdg_surface) orelse return error.UnableToGetXdgTopLevel;
+    wl.toplevel = c.xdg_surface_get_toplevel(xdg_surface) orelse return error.UnableToGetXdgTopLevel;
 
     // TODO: handle this return value
     _ = c.xdg_surface_add_listener(xdg_surface, &xdg_surface_listener.listener, linux);
 
     // TODO: handle this return value
-    _ = c.xdg_toplevel_add_listener(toplevel, &xdg_toplevel_listener.listener, linux);
+    _ = c.xdg_toplevel_add_listener(wl.toplevel, &xdg_toplevel_listener.listener, linux);
 
     // Commit changes to surface
     c.wl_surface_commit(wl.surface);
@@ -153,11 +155,11 @@ pub fn init(
         // This space intentionally left blank
     }
 
-    c.xdg_toplevel_set_title(toplevel, options.title);
+    c.xdg_toplevel_set_title(wl.toplevel, options.title);
 
     const decoration = c.zxdg_decoration_manager_v1_get_toplevel_decoration(
         wl.interfaces.zxdg_decoration_manager_v1,
-        toplevel,
+        wl.toplevel,
     ) orelse return error.UnableToGetToplevelDecoration;
 
     c.zxdg_toplevel_decoration_v1_set_mode(decoration, c.ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
@@ -204,6 +206,10 @@ pub fn update(wl: *Wayland, linux: *Linux) !void {
     wl.core.input.tick();
 }
 
+pub fn setTitle(wl: *Wayland, title: [:0]const u8) void {
+    c.xdg_toplevel_set_title(wl.toplevel, title);
+}
+
 const LibXkbCommon = struct {
     handle: std.DynLib,
 

src/core/linux/X11.zig

@@ -265,6 +265,10 @@ pub fn update(x11: *X11, linux: *Linux) !void {
     x11.core.input.tick();
 }
 
+pub fn setTitle(x11: *X11, title: [:0]const u8) void {
+    _ = x11.libx11.XStoreName(x11.display, x11.window, title);
+}
+
 const LibX11 = struct {
     handle: std.DynLib,
     XInitThreads: *const @TypeOf(c.XInitThreads),