View: refactor initialization

This anytype parameter is a wart that's been around for far too long.

river/Server.zig

@@ -33,9 +33,9 @@ const LayoutManager = @import("LayoutManager.zig");
 const Output = @import("Output.zig");
 const Root = @import("Root.zig");
 const StatusManager = @import("StatusManager.zig");
-const View = @import("View.zig");
+const XdgToplevel = @import("XdgToplevel.zig");
-const ViewStack = @import("view_stack.zig").ViewStack;
 const XwaylandUnmanaged = @import("XwaylandUnmanaged.zig");
+const XwaylandView = @import("XwaylandView.zig");
 const IdleInhibitorManager = @import("IdleInhibitorManager.zig");
 
 const log = std.log.scoped(.server);
@@ -187,13 +187,12 @@ fn handleNewXdgSurface(listener: *wl.Listener(*wlr.XdgSurface), xdg_surface: *wl
 
     log.debug("new xdg_toplevel", .{});
 
-    // The View will add itself to the output's view stack on map
     const output = self.input_manager.defaultSeat().focused_output;
-    const node = util.gpa.create(ViewStack(View).Node) catch {
+    XdgToplevel.create(output, xdg_surface) catch {
+        log.err("out of memory", .{});
         xdg_surface.resource.postNoMemory();
         return;
     };
-    node.view.init(output, xdg_surface);
 }
 
 /// This event is raised when the layer_shell recieves a new surface from a client.
@@ -239,25 +238,24 @@ fn handleNewLayerSurface(listener: *wl.Listener(*wlr.LayerSurfaceV1), wlr_layer_
     node.data.init(output, wlr_layer_surface);
 }
 
-fn handleNewXwaylandSurface(listener: *wl.Listener(*wlr.XwaylandSurface), wlr_xwayland_surface: *wlr.XwaylandSurface) void {
+fn handleNewXwaylandSurface(listener: *wl.Listener(*wlr.XwaylandSurface), xwayland_surface: *wlr.XwaylandSurface) void {
     const self = @fieldParentPtr(Self, "new_xwayland_surface", listener);
 
-    if (wlr_xwayland_surface.override_redirect) {
-        log.debug("new unmanaged xwayland surface", .{});
-        // The unmanged surface will add itself to the list of unmanaged views
-        // in Root when it is mapped.
-        const node = util.gpa.create(std.TailQueue(XwaylandUnmanaged).Node) catch return;
-        node.data.init(wlr_xwayland_surface);
-        return;
-    }
-
     log.debug(
-        "new xwayland surface: title '{s}', class '{s}'",
+        "new xwayland surface: title='{s}', class='{s}', override redirect={}",
-        .{ wlr_xwayland_surface.title, wlr_xwayland_surface.class },
+        .{ xwayland_surface.title, xwayland_surface.class, xwayland_surface.override_redirect },
     );
 
-    // The View will add itself to the output's view stack on map
+    if (xwayland_surface.override_redirect) {
+        _ = XwaylandUnmanaged.create(xwayland_surface) catch {
+            log.err("out of memory", .{});
+            return;
+        };
+    } else {
         const output = self.input_manager.defaultSeat().focused_output;
-    const node = util.gpa.create(ViewStack(View).Node) catch return;
+        _ = XwaylandView.create(output, xwayland_surface) catch {
-    node.view.init(output, wlr_xwayland_surface);
+            log.err("out of memory", .{});
+            return;
+        };
+    }
 }

river/View.zig

@@ -74,7 +74,7 @@ const SavedBuffer = struct {
 };
 
 /// The implementation of this view
-impl: Impl = undefined,
+impl: Impl,
 
 /// The output this view is currently associated with
 output: *Output,
@@ -102,7 +102,7 @@ surface_box: Box = undefined,
 saved_surface_box: Box = undefined,
 
 /// These are what we render while a transaction is in progress
-saved_buffers: std.ArrayList(SavedBuffer),
+saved_buffers: std.ArrayListUnmanaged(SavedBuffer) = .{},
 
 /// The floating dimensions the view, saved so that they can be restored if the
 /// view returns to floating mode.
@@ -126,26 +126,18 @@ foreign_close: wl.Listener(*wlr.ForeignToplevelHandleV1) =
 request_activate: wl.Listener(*wlr.XdgActivationV1.event.RequestActivate) =
     wl.Listener(*wlr.XdgActivationV1.event.RequestActivate).init(handleRequestActivate),
 
-pub fn init(self: *Self, output: *Output, surface: anytype) void {
+pub fn init(self: *Self, output: *Output, impl: Impl) void {
     const initial_tags = blk: {
         const tags = output.current.tags & output.spawn_tagmask;
         break :blk if (tags != 0) tags else output.current.tags;
     };
 
     self.* = .{
+        .impl = impl,
         .output = output,
         .current = .{ .tags = initial_tags },
         .pending = .{ .tags = initial_tags },
-        .saved_buffers = std.ArrayList(SavedBuffer).init(util.gpa),
     };
-
-    if (@TypeOf(surface) == *wlr.XdgSurface) {
-        self.impl = .{ .xdg_toplevel = undefined };
-        self.impl.xdg_toplevel.init(self, surface);
-    } else if (build_options.xwayland and @TypeOf(surface) == *wlr.XwaylandSurface) {
-        self.impl = .{ .xwayland_view = undefined };
-        self.impl.xwayland_view.init(self, surface);
-    } else unreachable;
 }
 
 /// If saved buffers of the view are currently in use by a transaction,
@@ -159,7 +151,7 @@ pub fn destroy(self: *Self) void {
     // around until the current transaction completes. This function will be
     // called again in Root.commitTransaction()
     if (self.saved_buffers.items.len == 0) {
-        self.saved_buffers.deinit();
+        self.saved_buffers.deinit(util.gpa);
 
         const node = @fieldParentPtr(ViewStack(Self).Node, "view", self);
         util.gpa.destroy(node);
@@ -237,19 +229,19 @@ pub fn dropSavedBuffers(self: *Self) void {
 pub fn saveBuffers(self: *Self) void {
     assert(self.saved_buffers.items.len == 0);
     self.saved_surface_box = self.surface_box;
-    self.forEachSurface(*std.ArrayList(SavedBuffer), saveBuffersIterator, &self.saved_buffers);
+    self.forEachSurface(*std.ArrayListUnmanaged(SavedBuffer), saveBuffersIterator, &self.saved_buffers);
 }
 
 fn saveBuffersIterator(
     surface: *wlr.Surface,
     surface_x: c_int,
     surface_y: c_int,
-    saved_buffers: *std.ArrayList(SavedBuffer),
+    saved_buffers: *std.ArrayListUnmanaged(SavedBuffer),
 ) callconv(.C) void {
     if (surface.buffer) |buffer| {
         var source_box: wlr.FBox = undefined;
         surface.getBufferSourceBox(&source_box);
-        saved_buffers.append(.{
+        saved_buffers.append(util.gpa, .{
             .client_buffer = buffer,
             .surface_box = .{
                 .x = surface_x,

river/XdgToplevel.zig

@@ -25,6 +25,7 @@ const server = &@import("main.zig").server;
 const util = @import("util.zig");
 
 const Box = @import("Box.zig");
+const Output = @import("Output.zig");
 const Seat = @import("Seat.zig");
 const Subsurface = @import("Subsurface.zig");
 const View = @import("View.zig");
@@ -62,8 +63,17 @@ request_resize: wl.Listener(*wlr.XdgToplevel.event.Resize) =
 set_title: wl.Listener(*wlr.XdgSurface) = wl.Listener(*wlr.XdgSurface).init(handleSetTitle),
 set_app_id: wl.Listener(*wlr.XdgSurface) = wl.Listener(*wlr.XdgSurface).init(handleSetAppId),
 
-pub fn init(self: *Self, view: *View, xdg_surface: *wlr.XdgSurface) void {
+/// The View will add itself to the output's view stack on map
-    self.* = .{ .view = view, .xdg_surface = xdg_surface };
+pub fn create(output: *Output, xdg_surface: *wlr.XdgSurface) error{OutOfMemory}!void {
+    const node = try util.gpa.create(ViewStack(View).Node);
+    const view = &node.view;
+
+    view.init(output, .{ .xdg_toplevel = .{
+        .view = view,
+        .xdg_surface = xdg_surface,
+    } });
+
+    const self = &node.view.impl.xdg_toplevel;
     xdg_surface.data = @ptrToInt(self);
 
     // Add listeners that are active over the view's entire lifetime

river/XwaylandUnmanaged.zig

@@ -47,7 +47,12 @@ set_override_redirect: wl.Listener(*wlr.XwaylandSurface) =
 // Listeners that are only active while mapped
 commit: wl.Listener(*wlr.Surface) = wl.Listener(*wlr.Surface).init(handleCommit),
 
-pub fn init(self: *Self, xwayland_surface: *wlr.XwaylandSurface) void {
+/// The unmanged surface will add itself to the list of unmanaged views
+/// in Root when it is mapped.
+pub fn create(xwayland_surface: *wlr.XwaylandSurface) error{OutOfMemory}!*Self {
+    const node = try util.gpa.create(std.TailQueue(Self).Node);
+    const self = &node.data;
+
     self.* = .{ .xwayland_surface = xwayland_surface };
 
     // Add listeners that are active over the the entire lifetime
@@ -55,6 +60,8 @@ pub fn init(self: *Self, xwayland_surface: *wlr.XwaylandSurface) void {
     xwayland_surface.events.destroy.add(&self.destroy);
     xwayland_surface.events.map.add(&self.map);
     xwayland_surface.events.unmap.add(&self.unmap);
+
+    return self;
 }
 
 fn handleRequestConfigure(
@@ -135,15 +142,13 @@ fn handleSetOverrideRedirect(
     if (xwayland_surface.mapped) handleUnmap(&self.unmap, xwayland_surface);
     handleDestroy(&self.destroy, xwayland_surface);
 
-    // The View will add itself to the output's view stack on map
     const output = server.input_manager.defaultSeat().focused_output;
-    const node = util.gpa.create(ViewStack(View).Node) catch {
+    const xwayland_view = XwaylandView.create(output, xwayland_surface) catch {
         log.err("out of memory", .{});
         return;
     };
-    node.view.init(output, xwayland_surface);
 
     if (xwayland_surface.mapped) {
-        XwaylandView.handleMap(&node.view.impl.xwayland_view.map, xwayland_surface);
+        XwaylandView.handleMap(&xwayland_view.map, xwayland_surface);
     }
 }

river/XwaylandView.zig

@@ -27,6 +27,7 @@ const server = &@import("main.zig").server;
 const util = @import("util.zig");
 
 const Box = @import("Box.zig");
+const Output = @import("Output.zig");
 const View = @import("View.zig");
 const ViewStack = @import("view_stack.zig").ViewStack;
 const XdgPopup = @import("XdgPopup.zig");
@@ -63,12 +64,18 @@ request_fullscreen: wl.Listener(*wlr.XwaylandSurface) =
 request_minimize: wl.Listener(*wlr.XwaylandSurface.event.Minimize) =
     wl.Listener(*wlr.XwaylandSurface.event.Minimize).init(handleRequestMinimize),
 
-pub fn init(self: *Self, view: *View, xwayland_surface: *wlr.XwaylandSurface) void {
+/// The View will add itself to the output's view stack on map
-    self.* = .{
+pub fn create(output: *Output, xwayland_surface: *wlr.XwaylandSurface) error{OutOfMemory}!*Self {
+    const node = try util.gpa.create(ViewStack(View).Node);
+    const view = &node.view;
+
+    view.init(output, .{ .xwayland_view = .{
         .view = view,
         .xwayland_surface = xwayland_surface,
         .last_set_fullscreen_state = xwayland_surface.fullscreen,
-    };
+    } });
+
+    const self = &node.view.impl.xwayland_view;
     xwayland_surface.data = @ptrToInt(self);
 
     // Add listeners that are active over the view's entire lifetime
@@ -76,6 +83,8 @@ pub fn init(self: *Self, view: *View, xwayland_surface: *wlr.XwaylandSurface) vo
     xwayland_surface.events.map.add(&self.map);
     xwayland_surface.events.unmap.add(&self.unmap);
     xwayland_surface.events.request_configure.add(&self.request_configure);
+
+    return self;
 }
 
 pub fn needsConfigure(self: Self) bool {
@@ -283,16 +292,13 @@ fn handleSetOverrideRedirect(
     if (xwayland_surface.mapped) handleUnmap(&self.unmap, xwayland_surface);
     handleDestroy(&self.destroy, xwayland_surface);
 
-    // The unmanged surface will add itself to the list of unmanaged views
+    const unmanaged = XwaylandUnmanaged.create(xwayland_surface) catch {
-    // in Root when it is mapped.
-    const node = util.gpa.create(std.TailQueue(XwaylandUnmanaged).Node) catch {
         log.err("out of memory", .{});
         return;
     };
-    node.data.init(xwayland_surface);
 
     if (xwayland_surface.mapped) {
-        XwaylandUnmanaged.handleMap(&node.data.map, xwayland_surface);
+        XwaylandUnmanaged.handleMap(&unmanaged.map, xwayland_surface);
     }
 }