Fix caching of backend object, copy SystemBackground from GNOME magnifier implemenation

gnome/src/extension.js

@@ -9,6 +9,7 @@ import { CursorManager } from './cursormanager.js';
 import Globals from './globals.js';
 import { Logger } from './logger.js';
 import { MonitorManager } from './monitormanager.js';
+import { SystemBackground } from './systembackground.js';
 import { isValidKeepAlive } from './time.js';
 import { IPC_FILE_PATH, XREffect } from './xrEffect.js';
 
@@ -250,24 +251,25 @@ export default class BreezyDesktopExtension extends Extension {
                 this._cursor_manager = new CursorManager(Main.layoutManager.uiGroup, refreshRate);
                 this._cursor_manager.enable();
 
-                this._overlay = new St.Bin();
-                this._overlay.opacity = 255;
+                const overlayContent = new Clutter.Actor({clip_to_allocation: true});
+
+                this._overlay = new St.Bin({
+                    child: overlayContent
+                });
                 this._overlay.set_position(targetMonitor.x, targetMonitor.y);
                 this._overlay.set_size(targetMonitor.width, targetMonitor.height);
-                Globals.logger.log_debug(`BreezyDesktopExtension _effect_enable overlay size: \
-                    ${targetMonitor.width}x${targetMonitor.height} at ${targetMonitor.x},${targetMonitor.y}`);
 
-                const overlayContent = new Clutter.Actor({clip_to_allocation: true});
+                global.stage.add_child(this._overlay);
+                Shell.util_set_hidden_from_pick(this._overlay, true);
+
+                this._background = new SystemBackground();
+                overlayContent.add_child(this._background);
+        
                 const uiClone = new Clutter.Clone({ source: Main.layoutManager.uiGroup, clip_to_allocation: true });
                 uiClone.x = -targetMonitor.x;
                 uiClone.y = -targetMonitor.y;
                 overlayContent.add_child(uiClone);
 
-                this._overlay.set_child(overlayContent);
-
-                Shell.util_set_hidden_from_pick(this._overlay, true);
-                global.stage.add_child(this._overlay);
-
                 // In GS 45, use of "actor" was renamed to "child".
                 const clutterContainer = Clutter.Container !== undefined;
                 this._actor_added_connection = global.stage.connect(

gnome/src/monitormanager.js

@@ -280,7 +280,6 @@ export const MonitorManager = GObject.registerClass({
 
         this._monitorsChangedConnection = null;
         this._displayConfigProxy = null;
-        this._backendManager = null;
         this._monitorProperties = null;
         this._changeHookFn = null;
         this._needsConfigCheck = this.use_optimal_monitor_config;
@@ -292,7 +291,6 @@ export const MonitorManager = GObject.registerClass({
 
     enable() {
         Globals.logger.log_debug('MonitorManager enable');
-        this._backendManager = global.backend.get_monitor_manager();
         newDisplayConfig(this.extension_path, ((proxy, error) => {
             if (error) {
                 return;
@@ -310,7 +308,6 @@ export const MonitorManager = GObject.registerClass({
 
         this._monitorsChangedConnection = null;
         this._displayConfigProxy = null;
-        this._backendManager = null;
         this._monitorProperties = null;
         this._changeHookFn = null;
     }
@@ -402,7 +399,7 @@ export const MonitorManager = GObject.registerClass({
             const monitorProperties = [];
             for (let i = 0; i < result.length; i++) {
                 const [monitorName, connectorName, vendor, product, serial, refreshRate] = result[i];
-                const monitorIndex = this._backendManager.get_monitor_for_connector(connectorName);
+                const monitorIndex = global.backend.get_monitor_manager().get_monitor_for_connector(connectorName);
                 Globals.logger.log_debug(`Found monitor ${monitorName}, vendor ${vendor}, product ${product}, serial ${serial}, connector ${connectorName}, index ${monitorIndex}`);
                 if (monitorIndex >= 0) {
                     monitorProperties[monitorIndex] = {

gnome/src/systembackground.js

@@ -0,0 +1,31 @@
+import Cogl from 'gi://Cogl';
+import GLib from 'gi://GLib';
+import GObject from 'gi://GObject';
+import Meta from 'gi://Meta';
+
+const DEFAULT_BACKGROUND_COLOR = new Cogl.Color({red: 40, green: 40, blue: 40, alpha: 255});
+
+let _systemBackground;
+
+export const SystemBackground = GObject.registerClass({
+    Signals: {'loaded': {}},
+}, class SystemBackground extends Meta.BackgroundActor {
+    _init() {
+        if (_systemBackground == null) {
+            _systemBackground = new Meta.Background({meta_display: global.display});
+            _systemBackground.set_color(DEFAULT_BACKGROUND_COLOR);
+        }
+
+        super._init({
+            meta_display: global.display,
+            monitor: 0,
+        });
+        this.content.background = _systemBackground;
+
+        let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, () => {
+            this.emit('loaded');
+            return GLib.SOURCE_REMOVE;
+        });
+        GLib.Source.set_name_by_id(id, '[gnome-shell] SystemBackground.loaded');
+    }
+});