Config: move opacity settings to sub struct

 river/Config.zig          | 26 ++++++++++++--------------
 river/Seat.zig            |  4 ++--
 river/View.zig            | 20 ++++++++++----------
 river/command/opacity.zig | 24 ++++++++++++------------
 4 files changed, 36 insertions(+), 38 deletions(-)

diff --git a/river/Config.zig b/river/Config.zig
index 40f8cfd..8460b8d 100644
--- a/river/Config.zig
+++ b/river/Config.zig
@@ -66,20 +66,18 @@ csd_filter: std.ArrayList([]const u8),
 /// The selected focus_follows_cursor mode
 focus_follows_cursor: FocusFollowsCursorMode = .disabled,
 
-/// The opacity of the focused view
-view_opacity_focused: f32 = 1.0,
-
-/// The opacity of unfocused views
-view_opacity_unfocused: f32 = 1.0,
-
-/// The starting opacity of new views
-view_opacity_initial: f32 = 1.0,
-
-/// View opacity transition step
-view_opacity_delta: f32 = 1.0,
-
-/// Time between view opacity transition steps in msec
-view_opacity_delta_t: u31 = 20,
+opacity: struct {
+    /// The opacity of focused views
+    focused: f32 = 1.0,
+    /// The opacity of unfocused views
+    unfocused: f32 = 1.0,
+    /// The initial opacity of new views
+    initial: f32 = 1.0,
+    /// View opacity transition step
+    delta: f32 = 1.0,
+    /// Time between view opacity transition steps in milliseconds
+    delta_t: u31 = 20,
+} = .{},
 
 /// Keyboard repeat rate in characters per second
 repeat_rate: u31 = 25,
diff --git a/river/Seat.zig b/river/Seat.zig
index c725053..4953072 100644
--- a/river/Seat.zig
+++ b/river/Seat.zig
@@ -200,7 +200,7 @@ pub fn setFocusRaw(self: *Self, new_focus: FocusTarget) void {
             if (build_options.xwayland and self.focused.view.impl == .xwayland_view)
                 self.focused.view.impl.xwayland_view.xwayland_surface.activate(false);
             if (self.focused.view.pending.focus == 0 and !self.focused.view.pending.fullscreen) {
-                self.focused.view.pending.target_opacity = self.input_manager.server.config.view_opacity_unfocused;
+                self.focused.view.pending.target_opacity = self.input_manager.server.config.opacity.unfocused;
             }
         }
 
@@ -214,7 +214,7 @@ pub fn setFocusRaw(self: *Self, new_focus: FocusTarget) void {
                 if (build_options.xwayland and target_view.impl == .xwayland_view)
                     target_view.impl.xwayland_view.xwayland_surface.activate(true);
                 if (!target_view.pending.fullscreen) {
-                    target_view.pending.target_opacity = self.input_manager.server.config.view_opacity_focused;
+                    target_view.pending.target_opacity = self.input_manager.server.config.opacity.focused;
                 }
             },
             .layer => |target_layer| std.debug.assert(self.focused_output == target_layer.output),
diff --git a/river/View.zig b/river/View.zig
index b0c99dc..b20f702 100644
--- a/river/View.zig
+++ b/river/View.zig
@@ -140,14 +140,14 @@ pub fn init(self: *Self, output: *Output, tags: u32, surface: anytype) void {
         .output = output,
         .current = .{
             .tags = tags,
-            .target_opacity = output.root.server.config.view_opacity_initial,
+            .target_opacity = output.root.server.config.opacity.initial,
         },
         .pending = .{
             .tags = tags,
-            .target_opacity = output.root.server.config.view_opacity_initial,
+            .target_opacity = output.root.server.config.opacity.initial,
         },
         .saved_buffers = std.ArrayList(SavedBuffer).init(util.gpa),
-        .opacity = output.root.server.config.view_opacity_initial,
+        .opacity = output.root.server.config.opacity.initial,
     };
 
     if (@TypeOf(surface) == *wlr.XdgSurface) {
@@ -224,9 +224,9 @@ pub fn applyPending(self: *Self) void {
 
         // Restore configured opacity
         self.pending.target_opacity = if (self.pending.focus > 0)
-            self.output.root.server.config.view_opacity_focused
+            self.output.root.server.config.opacity.focused
         else
-            self.output.root.server.config.view_opacity_unfocused;
+            self.output.root.server.config.opacity.unfocused;
     }
 
     if (arrange_output) self.output.arrangeViews();
@@ -440,7 +440,7 @@ pub fn shouldTrackConfigure(self: Self) bool {
 pub fn map(self: *Self) void {
     const root = self.output.root;
 
-    self.pending.target_opacity = self.output.root.server.config.view_opacity_unfocused;
+    self.pending.target_opacity = self.output.root.server.config.opacity.unfocused;
 
     log.debug(.server, "view '{}' mapped", .{self.getTitle()});
 
@@ -528,16 +528,16 @@ pub fn notifyAppId(self: Self) void {
     }
 }
 
-/// Change the opacity of a view by config.view_opacity_delta.
+/// Change the opacity of a view by config.opacity.delta.
 /// If the target opacity was reached, return true.
 fn incrementOpacity(self: *Self) bool {
     // TODO damage view when implementing damage based rendering
     const config = &self.output.root.server.config;
     if (self.opacity < self.current.target_opacity) {
-        self.opacity += config.view_opacity_delta;
+        self.opacity += config.opacity.delta;
         if (self.opacity < self.current.target_opacity) return false;
     } else {
-        self.opacity -= config.view_opacity_delta;
+        self.opacity -= config.opacity.delta;
         if (self.opacity > self.current.target_opacity) return false;
     }
     self.opacity = self.current.target_opacity;
@@ -552,7 +552,7 @@ fn killOpacityTimer(self: *Self) void {
 
 /// Set the timeout on a views opacity timer
 fn armOpacityTimer(self: *Self) void {
-    const delta_t = self.output.root.server.config.view_opacity_delta_t;
+    const delta_t = self.output.root.server.config.opacity.delta_t;
     self.opacity_timer.?.timerUpdate(delta_t) catch |err| {
         log.err(.view, "failed to update opacity timer: {}", .{err});
         self.killOpacityTimer();
diff --git a/river/command/opacity.zig b/river/command/opacity.zig
index 68466db..79ff9bd 100644
--- a/river/command/opacity.zig
+++ b/river/command/opacity.zig
@@ -39,28 +39,28 @@ pub fn opacity(
     const server = seat.input_manager.server;
 
     // Focused opacity
-    server.config.view_opacity_focused = try std.fmt.parseFloat(f32, args[1]);
-    if (server.config.view_opacity_focused < 0.0 or server.config.view_opacity_focused > 1.0)
+    server.config.opacity.focused = try std.fmt.parseFloat(f32, args[1]);
+    if (server.config.opacity.focused < 0.0 or server.config.opacity.focused > 1.0)
         return Error.InvalidValue;
 
     // Unfocused opacity
-    server.config.view_opacity_unfocused = try std.fmt.parseFloat(f32, args[2]);
-    if (server.config.view_opacity_unfocused < 0.0 or server.config.view_opacity_unfocused > 1.0)
+    server.config.opacity.unfocused = try std.fmt.parseFloat(f32, args[2]);
+    if (server.config.opacity.unfocused < 0.0 or server.config.opacity.unfocused > 1.0)
         return Error.InvalidValue;
 
     // Starting opacity for new views
-    server.config.view_opacity_initial = try std.fmt.parseFloat(f32, args[3]);
-    if (server.config.view_opacity_initial < 0.0 or server.config.view_opacity_initial > 1.0)
+    server.config.opacity.initial = try std.fmt.parseFloat(f32, args[3]);
+    if (server.config.opacity.initial < 0.0 or server.config.opacity.initial > 1.0)
         return Error.InvalidValue;
 
     // Opacity transition step
-    server.config.view_opacity_delta = try std.fmt.parseFloat(f32, args[4]);
-    if (server.config.view_opacity_delta < 0.0 or server.config.view_opacity_delta > 1.0)
+    server.config.opacity.delta = try std.fmt.parseFloat(f32, args[4]);
+    if (server.config.opacity.delta < 0.0 or server.config.opacity.delta > 1.0)
         return Error.InvalidValue;
 
     // Time between step
-    server.config.view_opacity_delta_t = try std.fmt.parseInt(u31, args[5], 10);
-    if (server.config.view_opacity_delta_t < 1) return Error.InvalidValue;
+    server.config.opacity.delta_t = try std.fmt.parseInt(u31, args[5], 10);
+    if (server.config.opacity.delta_t < 1) return Error.InvalidValue;
 
     // Update opacity of all views
     // Unmapped views will be skipped, however their opacity gets updated on map anyway
@@ -69,9 +69,9 @@ pub fn opacity(
         var vit = ViewStack(View).iter(onode.data.views.first, .forward, {}, opacityUpdateFilter);
         while (vit.next()) |vnode| {
             if (vnode.current.focus > 0) {
-                vnode.pending.target_opacity = server.config.view_opacity_focused;
+                vnode.pending.target_opacity = server.config.opacity.focused;
             } else {
-                vnode.pending.target_opacity = server.config.view_opacity_unfocused;
+                vnode.pending.target_opacity = server.config.opacity.unfocused;
             }
         }
     }