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gtk: request initial color scheme asynchronously
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Requesting the initial color scheme on systems where the D-Bus interface
is nonexistent would delay Ghostty startup by 1-2 minutes. That's not
acceptable. Our color scheme events are already async-friendly anyway.

Fixes ghostty-org#4632
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@pluiedev
pluiedev committed Jan 14, 2025
1 parent caddf59 commit a95c325
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Showing 2 changed files with 61 additions and 82 deletions.
141 changes: 60 additions & 81 deletions src/apprt/gtk/App.zig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,10 @@ clipboard_confirmation_window: ?*ClipboardConfirmationWindow = null,
/// This is set to false when the main loop should exit.
running: bool = true,

/// If we should retry querying D-Bus for the color scheme with the deprecated
/// Read method, instead of the recommended ReadOne method.
dbus_retry: bool = true,

/// The base path of the transient cgroup used to put all surfaces
/// into their own cgroup. This is only set if cgroups are enabled
/// and initialization was successful.
Expand Down Expand Up @@ -1254,17 +1258,15 @@ pub fn run(self: *App) !void {
self.transient_cgroup_base = path;
} else log.debug("cgroup isolation disabled config={}", .{self.config.@"linux-cgroup"});

// Setup our D-Bus connection for listening to settings changes.
// Setup our D-Bus connection for listening to settings changes,
// and asynchronously request the initial color scheme
self.initDbus();

// Setup our menu items
self.initActions();
self.initMenu();
self.initContextMenu();

// Setup our initial color scheme
self.colorSchemeEvent(self.getColorScheme());

// On startup, we want to check for configuration errors right away
// so we can show our error window. We also need to setup other initial
// state.
Expand Down Expand Up @@ -1312,6 +1314,21 @@ fn initDbus(self: *App) void {
self,
null,
);

c.g_dbus_connection_call(
dbus,
"org.freedesktop.portal.Desktop",
"/org/freedesktop/portal/desktop",
"org.freedesktop.portal.Settings",
"ReadOne",
c.g_variant_new("(ss)", "org.freedesktop.appearance", "color-scheme"),
c.G_VARIANT_TYPE("(v)"),
c.G_DBUS_CALL_FLAGS_NONE,
-1,
null,
dbusColorSchemeCallback,
self,
);
}

// This timeout function is started when no surfaces are open. It can be
Expand Down Expand Up @@ -1549,93 +1566,55 @@ fn gtkWindowIsActive(
core_app.focusEvent(false);
}

/// Call a D-Bus method to determine the current color scheme. If there
/// is any error at any point we'll log the error and return "light"
pub fn getColorScheme(self: *App) apprt.ColorScheme {
const dbus_connection = c.g_application_get_dbus_connection(@ptrCast(self.app));
fn dbusColorSchemeCallback(
source_object: [*c]c.GObject,
res: ?*c.GAsyncResult,
ud: ?*anyopaque,
) callconv(.C) void {
const self: *App = @ptrCast(@alignCast(ud.?));
const dbus: *c.GDBusConnection = @ptrCast(source_object);

var err: ?*c.GError = null;
defer if (err) |e| c.g_error_free(e);

const value = c.g_dbus_connection_call_sync(
dbus_connection,
"org.freedesktop.portal.Desktop",
"/org/freedesktop/portal/desktop",
"org.freedesktop.portal.Settings",
"ReadOne",
c.g_variant_new("(ss)", "org.freedesktop.appearance", "color-scheme"),
c.G_VARIANT_TYPE("(v)"),
c.G_DBUS_CALL_FLAGS_NONE,
-1,
null,
&err,
) orelse {
if (err) |e| {
// If ReadOne is not yet implemented, fall back to deprecated "Read" method
// Error code: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such method “ReadOne”
if (e.code == 19) {
return self.getColorSchemeDeprecated();
if (c.g_dbus_connection_call_finish(dbus, res, &err)) |value| {
if (c.g_variant_is_of_type(value, c.G_VARIANT_TYPE("(v)")) == 1) {
var inner: ?*c.GVariant = null;
c.g_variant_get(value, "(v)", &inner);
defer c.g_variant_unref(inner);
if (c.g_variant_is_of_type(inner, c.G_VARIANT_TYPE("u")) == 1) {
self.colorSchemeEvent(if (c.g_variant_get_uint32(inner) == 1) .dark else .light);
return;
}
// Otherwise, log the error and return .light
log.err("unable to get current color scheme: {s}", .{e.message});
}
return .light;
};
defer c.g_variant_unref(value);
} else if (err) |e| {
// If ReadOne is not yet implemented, fall back to deprecated "Read" method
// Error code: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such method “ReadOne”
if (self.dbus_retry and e.code == 19) {
c.g_dbus_connection_call(
dbus,
"org.freedesktop.portal.Desktop",
"/org/freedesktop/portal/desktop",
"org.freedesktop.portal.Settings",
"Read",
c.g_variant_new("(ss)", "org.freedesktop.appearance", "color-scheme"),
c.G_VARIANT_TYPE("(v)"),
c.G_DBUS_CALL_FLAGS_NONE,
-1,
null,
dbusColorSchemeCallback,
self,
);

if (c.g_variant_is_of_type(value, c.G_VARIANT_TYPE("(v)")) == 1) {
var inner: ?*c.GVariant = null;
c.g_variant_get(value, "(v)", &inner);
defer c.g_variant_unref(inner);
if (c.g_variant_is_of_type(inner, c.G_VARIANT_TYPE("u")) == 1) {
return if (c.g_variant_get_uint32(inner) == 1) .dark else .light;
self.dbus_retry = false;
return;
}
// Otherwise, log the error and return .light
log.err("unable to get current color scheme: {s}", .{e.message});
}

return .light;
}

/// Call the deprecated D-Bus "Read" method to determine the current color scheme. If
/// there is any error at any point we'll log the error and return "light"
fn getColorSchemeDeprecated(self: *App) apprt.ColorScheme {
const dbus_connection = c.g_application_get_dbus_connection(@ptrCast(self.app));
var err: ?*c.GError = null;
defer if (err) |e| c.g_error_free(e);

const value = c.g_dbus_connection_call_sync(
dbus_connection,
"org.freedesktop.portal.Desktop",
"/org/freedesktop/portal/desktop",
"org.freedesktop.portal.Settings",
"Read",
c.g_variant_new("(ss)", "org.freedesktop.appearance", "color-scheme"),
c.G_VARIANT_TYPE("(v)"),
c.G_DBUS_CALL_FLAGS_NONE,
-1,
null,
&err,
) orelse {
if (err) |e| log.err("Read method failed: {s}", .{e.message});
return .light;
};
defer c.g_variant_unref(value);

if (c.g_variant_is_of_type(value, c.G_VARIANT_TYPE("(v)")) == 1) {
var inner: ?*c.GVariant = null;
c.g_variant_get(value, "(v)", &inner);
defer if (inner) |i| c.g_variant_unref(i);

if (inner) |i| {
const child = c.g_variant_get_child_value(i, 0) orelse {
return .light;
};
defer c.g_variant_unref(child);

const val = c.g_variant_get_uint32(child);
return if (val == 1) .dark else .light;
}
}
return .light;
// Fall back
self.colorSchemeEvent(.light);
}

/// This will be called by D-Bus when the style changes between light & dark.
Expand Down
2 changes: 1 addition & 1 deletion src/apprt/gtk/Surface.zig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -635,7 +635,7 @@ fn realize(self: *Surface) !void {
}

// Set the initial color scheme
try self.core_surface.colorSchemeCallback(self.app.getColorScheme());
// try self.core_surface.colorSchemeCallback(self.app.getColorScheme());

// Note we're realized
self.realized = true;
Expand Down

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