8096e71c53
The code that cleaned up when a background actor was destroyed tried to access the Background as backgroundActor.background._delegate but when the destroy signal is emitted, the MetaBackgroundActor was already disposed and backgroundActor.background NULL.
711 lines
26 KiB
JavaScript
711 lines
26 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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// READ THIS FIRST
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// Background handling is a maze of objects, both objects in this file, and
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// also objects inside Mutter. They all have a role.
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//
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// BackgroundManager
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// The only object that other parts of GNOME Shell deal with; a
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// BackgroundManager creates background actors and adds them to
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// the specified container. When the background is changed by the
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// user it will fade out the old actor and fade in the new actor.
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// (This is separate from the fading for an animated background,
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// since using two actors is quite inefficient.)
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//
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// MetaBackgroundImage
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// An object represented an image file that will be used for drawing
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// the background. MetaBackgroundImage objects asynchronously load,
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// so they are first created in an unloaded state, then later emit
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// a ::loaded signal when the Cogl object becomes available.
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//
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// MetaBackgroundImageCache
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// A cache from filename to MetaBackgroundImage.
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//
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// BackgroundSource
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// An object that is created for each GSettings schema (separate
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// settings schemas are used for the lock screen and main background),
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// and holds a reference to shared Background objects.
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//
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// MetaBackground
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// Holds the specification of a background - a background color
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// or gradient and one or two images blended together.
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//
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// Background
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// JS delegate object that Connects a MetaBackground to the GSettings
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// schema for the background.
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//
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// Animation
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// A helper object that handles loading a XML-based animation; it is a
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// wrapper for GnomeDesktop.BGSlideShow
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//
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// MetaBackgroundActor
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// An actor that draws the background for a single monitor
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//
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// BackgroundCache
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// A cache of Settings schema => BackgroundSource and of a single Animation.
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// Also used to share file monitors.
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//
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// A static image, background color or gradient is relatively straightforward. The
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// calling code creates a separate BackgroundManager for each monitor. Since they
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// are created for the same GSettings schema, they will use the same BackgroundSource
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// object, which provides a single Background and correspondingly a single
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// MetaBackground object.
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//
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// BackgroundManager BackgroundManager
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// | \ / |
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// | BackgroundSource | looked up in BackgroundCache
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// | | |
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// | Background |
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// | | |
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// MetaBackgroundActor | MetaBackgroundActor
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// \ | /
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// `------- MetaBackground ------'
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// |
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// MetaBackgroundImage looked up in MetaBackgroundImageCache
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//
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// The animated case is tricker because the animation XML file can specify different
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// files for different monitor resolutions and aspect ratios. For this reason,
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// the BackgroundSource provides different Background share a single Animation object,
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// which tracks the animation, but use different MetaBackground objects. In the
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// common case, the different MetaBackground objects will be created for the
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// same filename and look up the *same* MetaBackgroundImage object, so there is
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// little wasted memory:
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//
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// BackgroundManager BackgroundManager
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// | \ / |
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// | BackgroundSource | looked up in BackgroundCache
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// | / \ |
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// | Background Background |
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// | | \ / | |
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// | | Animation | | looked up in BackgroundCache
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// MetaBackgroundA|tor Me|aBackgroundActor
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// \ | | /
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// MetaBackground MetaBackground
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// \ /
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// MetaBackgroundImage looked up in MetaBackgroundImageCache
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// MetaBackgroundImage
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//
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// But the case of different filenames and different background images
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// is possible as well:
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// ....
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// MetaBackground MetaBackground
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// | |
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// MetaBackgroundImage MetaBackgroundImage
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// MetaBackgroundImage MetaBackgroundImage
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const Clutter = imports.gi.Clutter;
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const GDesktopEnums = imports.gi.GDesktopEnums;
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const Gio = imports.gi.Gio;
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const GLib = imports.gi.GLib;
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const GnomeDesktop = imports.gi.GnomeDesktop;
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const Lang = imports.lang;
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const Meta = imports.gi.Meta;
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const Signals = imports.signals;
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const Main = imports.ui.main;
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const Params = imports.misc.params;
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const Tweener = imports.ui.tweener;
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const BACKGROUND_SCHEMA = 'org.gnome.desktop.background';
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const PRIMARY_COLOR_KEY = 'primary-color';
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const SECONDARY_COLOR_KEY = 'secondary-color';
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const COLOR_SHADING_TYPE_KEY = 'color-shading-type';
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const BACKGROUND_STYLE_KEY = 'picture-options';
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const PICTURE_OPACITY_KEY = 'picture-opacity';
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const PICTURE_URI_KEY = 'picture-uri';
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const FADE_ANIMATION_TIME = 1.0;
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// These parameters affect how often we redraw.
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// The first is how different (percent crossfaded) the slide show
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// has to look before redrawing and the second is the minimum
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// frequency (in seconds) we're willing to wake up
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const ANIMATION_OPACITY_STEP_INCREMENT = 4.0;
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const ANIMATION_MIN_WAKEUP_INTERVAL = 1.0;
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let _backgroundCache = null;
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const BackgroundCache = new Lang.Class({
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Name: 'BackgroundCache',
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_init: function() {
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this._pendingFileLoads = [];
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this._fileMonitors = {};
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this._backgroundSources = {};
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},
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monitorFile: function(filename) {
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if (this._fileMonitors[filename])
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return;
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let file = Gio.File.new_for_path(filename);
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let monitor = file.monitor(Gio.FileMonitorFlags.NONE, null);
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monitor.connect('changed',
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Lang.bind(this, function() {
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this.emit('file-changed', filename);
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}));
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this._fileMonitors[filename] = monitor;
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},
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getAnimation: function(params) {
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params = Params.parse(params, { filename: null,
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onLoaded: null });
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if (this._animationFilename == params.filename) {
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if (params.onLoaded) {
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let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
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params.onLoaded(this._animation);
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return GLib.SOURCE_REMOVE;
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}));
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GLib.Source.set_name_by_id(id, '[gnome-shell] params.onLoaded');
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}
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}
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let animation = new Animation({ filename: params.filename });
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animation.load(Lang.bind(this, function() {
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this._animationFilename = params.filename;
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this._animation = animation;
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if (params.onLoaded) {
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let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
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params.onLoaded(this._animation);
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return GLib.SOURCE_REMOVE;
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}));
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GLib.Source.set_name_by_id(id, '[gnome-shell] params.onLoaded');
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}
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}));
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},
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getBackgroundSource: function(layoutManager, settingsSchema) {
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// The layoutManager is always the same one; we pass in it since
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// Main.layoutManager may not be set yet
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if (!(settingsSchema in this._backgroundSources)) {
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this._backgroundSources[settingsSchema] = new BackgroundSource(layoutManager, settingsSchema);
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this._backgroundSources[settingsSchema]._useCount = 1;
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} else {
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this._backgroundSources[settingsSchema]._useCount++;
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}
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return this._backgroundSources[settingsSchema];
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},
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releaseBackgroundSource: function(settingsSchema) {
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if (settingsSchema in this._backgroundSources) {
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let source = this._backgroundSources[settingsSchema];
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source._useCount--;
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if (source._useCount == 0) {
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delete this._backgroundSources[settingsSchema];
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source.destroy();
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}
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}
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}
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});
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Signals.addSignalMethods(BackgroundCache.prototype);
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function getBackgroundCache() {
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if (!_backgroundCache)
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_backgroundCache = new BackgroundCache();
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return _backgroundCache;
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}
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const Background = new Lang.Class({
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Name: 'Background',
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_init: function(params) {
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params = Params.parse(params, { monitorIndex: 0,
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layoutManager: Main.layoutManager,
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settings: null,
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filename: null,
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style: null });
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this.background = new Meta.Background({ meta_screen: global.screen });
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this.background._delegate = this;
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this._settings = params.settings;
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this._filename = params.filename;
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this._style = params.style;
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this._monitorIndex = params.monitorIndex;
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this._layoutManager = params.layoutManager;
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this._fileWatches = {};
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this._cancellable = new Gio.Cancellable();
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this.isLoaded = false;
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this._settingsChangedSignalId = this._settings.connect('changed', Lang.bind(this, function() {
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this.emit('changed');
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}));
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this._load();
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},
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destroy: function() {
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this._cancellable.cancel();
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if (this._updateAnimationTimeoutId) {
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GLib.source_remove (this._updateAnimationTimeoutId);
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this._updateAnimationTimeoutId = 0;
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}
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let i;
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let keys = Object.keys(this._fileWatches);
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for (i = 0; i < keys.length; i++) {
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this._cache.disconnect(this._fileWatches[keys[i]]);
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}
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this._fileWatches = null;
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if (this._settingsChangedSignalId != 0)
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this._settings.disconnect(this._settingsChangedSignalId);
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this._settingsChangedSignalId = 0;
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},
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_setLoaded: function() {
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if (this.isLoaded)
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return;
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this.isLoaded = true;
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let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
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this.emit('loaded');
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return GLib.SOURCE_REMOVE;
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}));
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GLib.Source.set_name_by_id(id, '[gnome-shell] this.emit');
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},
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_loadPattern: function() {
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let colorString, res, color, secondColor;
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colorString = this._settings.get_string(PRIMARY_COLOR_KEY);
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[res, color] = Clutter.Color.from_string(colorString);
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colorString = this._settings.get_string(SECONDARY_COLOR_KEY);
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[res, secondColor] = Clutter.Color.from_string(colorString);
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let shadingType = this._settings.get_enum(COLOR_SHADING_TYPE_KEY);
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if (shadingType == GDesktopEnums.BackgroundShading.SOLID)
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this.background.set_color(color);
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else
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this.background.set_gradient(shadingType, color, secondColor);
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},
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_watchFile: function(filename) {
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if (this._fileWatches[filename])
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return;
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this._cache.monitorFile(filename);
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let signalId = this._cache.connect('file-changed',
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Lang.bind(this, function(cache, changedFile) {
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if (changedFile == filename) {
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this.emit('changed');
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}
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}));
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this._fileWatches[filename] = signalId;
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},
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_updateAnimation: function() {
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this._updateAnimationTimeoutId = 0;
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this._animation.update(this._layoutManager.monitors[this._monitorIndex]);
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let files = this._animation.keyFrameFiles;
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let finish = Lang.bind(this, function() {
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this._setLoaded();
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if (files.length > 1) {
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this.background.set_blend(files[0], files[1],
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this._animation.transitionProgress,
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this._style);
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} else if (files.length > 0) {
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this.background.set_filename(files[0], this._style);
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} else {
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this.background.set_filename(null, this._style);
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}
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this._queueUpdateAnimation();
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});
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let cache = Meta.BackgroundImageCache.get_default();
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let numPendingImages = files.length;
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let images = [];
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for (let i = 0; i < files.length; i++) {
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this._watchFile(files[i]);
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let image = cache.load(files[i]);
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images.push(image);
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if (image.is_loaded()) {
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numPendingImages--;
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if (numPendingImages == 0)
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finish();
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} else {
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let id = image.connect('loaded',
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Lang.bind(this, function() {
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image.disconnect(id);
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numPendingImages--;
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if (numPendingImages == 0)
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finish();
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}));
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}
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}
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},
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_queueUpdateAnimation: function() {
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if (this._updateAnimationTimeoutId != 0)
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return;
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if (!this._cancellable || this._cancellable.is_cancelled())
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return;
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if (!this._animation.transitionDuration)
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return;
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let nSteps = 255 / ANIMATION_OPACITY_STEP_INCREMENT;
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let timePerStep = (this._animation.transitionDuration * 1000) / nSteps;
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let interval = Math.max(ANIMATION_MIN_WAKEUP_INTERVAL * 1000,
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timePerStep);
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if (interval > GLib.MAXUINT32)
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return;
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this._updateAnimationTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
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interval,
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Lang.bind(this, function() {
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this._updateAnimationTimeoutId = 0;
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this._updateAnimation();
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return GLib.SOURCE_REMOVE;
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}));
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GLib.Source.set_name_by_id(this._updateAnimationTimeoutId, '[gnome-shell] this._updateAnimation');
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},
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_loadAnimation: function(filename) {
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this._cache.getAnimation({ filename: filename,
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onLoaded: Lang.bind(this, function(animation) {
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this._animation = animation;
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if (!this._animation || this._cancellable.is_cancelled()) {
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this._setLoaded();
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return;
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}
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this._updateAnimation();
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this._watchFile(filename);
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})
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});
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},
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_loadImage: function(filename) {
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this.background.set_filename(filename, this._style);
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this._watchFile(filename);
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let cache = Meta.BackgroundImageCache.get_default();
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let image = cache.load(filename);
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if (image.is_loaded())
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this._setLoaded();
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else {
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let id = image.connect('loaded',
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Lang.bind(this, function() {
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this._setLoaded();
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image.disconnect(id);
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}));
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}
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},
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_loadFile: function(filename) {
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if (filename.endsWith('.xml'))
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this._loadAnimation(filename);
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else
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this._loadImage(filename);
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},
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_load: function () {
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this._cache = getBackgroundCache();
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this._loadPattern();
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if (!this._filename) {
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this._setLoaded();
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return;
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}
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this._loadFile(this._filename);
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},
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});
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Signals.addSignalMethods(Background.prototype);
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let _systemBackground;
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const SystemBackground = new Lang.Class({
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Name: 'SystemBackground',
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_init: function() {
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let filename = global.datadir + '/theme/noise-texture.png';
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if (_systemBackground == null) {
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_systemBackground = new Meta.Background({ meta_screen: global.screen });
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_systemBackground.set_filename(filename, GDesktopEnums.BackgroundStyle.WALLPAPER);
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}
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this.actor = new Meta.BackgroundActor({ meta_screen: global.screen,
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monitor: 0,
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background: _systemBackground });
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let cache = Meta.BackgroundImageCache.get_default();
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let image = cache.load(filename);
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if (image.is_loaded()) {
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image = null;
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let id = GLib.idle_add(GLib.PRIORITY_DEFAULT, Lang.bind(this, function() {
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this.emit('loaded');
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return GLib.SOURCE_REMOVE;
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}));
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GLib.Source.set_name_by_id(id, '[gnome-shell] SystemBackground.loaded');
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} else {
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let id = image.connect('loaded',
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Lang.bind(this, function() {
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this.emit('loaded');
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image.disconnect(id);
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image = null;
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}));
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}
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},
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});
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Signals.addSignalMethods(SystemBackground.prototype);
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const BackgroundSource = new Lang.Class({
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Name: 'BackgroundSource',
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_init: function(layoutManager, settingsSchema) {
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// Allow override the background image setting for performance testing
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this._layoutManager = layoutManager;
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this._overrideImage = GLib.getenv('SHELL_BACKGROUND_IMAGE');
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this._settings = new Gio.Settings({ schema_id: settingsSchema });
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this._backgrounds = [];
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},
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getBackground: function(monitorIndex) {
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let filename = null;
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let style;
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if (this._overrideImage != null) {
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filename = this._overrideImage;
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style = GDesktopEnums.BackgroundStyle.ZOOM; // Hardcode
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} else {
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style = this._settings.get_enum(BACKGROUND_STYLE_KEY);
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if (style != GDesktopEnums.BackgroundStyle.NONE) {
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let uri = this._settings.get_string(PICTURE_URI_KEY);
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if (GLib.uri_parse_scheme(uri) != null)
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filename = Gio.File.new_for_uri(uri).get_path();
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else
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filename = uri;
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}
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}
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// Animated backgrounds are (potentially) per-monitor, since
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// they can have variants that depend on the aspect ratio and
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// size of the monitor; for other backgrounds we can use the
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// same background object for all monitors.
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if (filename == null || !filename.endsWith('.xml'))
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monitorIndex = 0;
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if (!(monitorIndex in this._backgrounds)) {
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let background = new Background({
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monitorIndex: monitorIndex,
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layoutManager: this._layoutManager,
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settings: this._settings,
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filename: filename,
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style: style
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});
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let changedId = background.connect('changed', Lang.bind(this, function() {
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background.disconnect(changedId);
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background.destroy();
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delete this._backgrounds[monitorIndex];
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}));
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this._backgrounds[monitorIndex] = background;
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}
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return this._backgrounds[monitorIndex];
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},
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destroy: function() {
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for (let monitorIndex in this._backgrounds)
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this._backgrounds[monitorIndex].destroy();
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this._backgrounds = null;
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}
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});
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const Animation = new Lang.Class({
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Name: 'Animation',
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_init: function(params) {
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params = Params.parse(params, { filename: null });
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this.filename = params.filename;
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this.keyFrameFiles = [];
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this.transitionProgress = 0.0;
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this.transitionDuration = 0.0;
|
|
this.loaded = false;
|
|
},
|
|
|
|
load: function(callback) {
|
|
let file = Gio.File.new_for_path(this.filename);
|
|
|
|
this._show = new GnomeDesktop.BGSlideShow({ filename: this.filename });
|
|
|
|
this._show.load_async(null,
|
|
Lang.bind(this,
|
|
function(object, result) {
|
|
this.loaded = true;
|
|
if (callback)
|
|
callback();
|
|
}));
|
|
},
|
|
|
|
update: function(monitor) {
|
|
this.keyFrameFiles = [];
|
|
|
|
if (!this._show)
|
|
return;
|
|
|
|
if (this._show.get_num_slides() < 1)
|
|
return;
|
|
|
|
let [progress, duration, isFixed, file1, file2] = this._show.get_current_slide(monitor.width, monitor.height);
|
|
|
|
this.transitionDuration = duration;
|
|
this.transitionProgress = progress;
|
|
|
|
if (file1)
|
|
this.keyFrameFiles.push(file1);
|
|
|
|
if (file2)
|
|
this.keyFrameFiles.push(file2);
|
|
},
|
|
});
|
|
Signals.addSignalMethods(Animation.prototype);
|
|
|
|
const BackgroundManager = new Lang.Class({
|
|
Name: 'BackgroundManager',
|
|
|
|
_init: function(params) {
|
|
params = Params.parse(params, { container: null,
|
|
layoutManager: Main.layoutManager,
|
|
monitorIndex: null,
|
|
vignette: false,
|
|
controlPosition: true,
|
|
settingsSchema: BACKGROUND_SCHEMA });
|
|
|
|
let cache = getBackgroundCache();
|
|
this._settingsSchema = params.settingsSchema;
|
|
this._backgroundSource = cache.getBackgroundSource(params.layoutManager, params.settingsSchema);
|
|
|
|
this._container = params.container;
|
|
this._layoutManager = params.layoutManager;
|
|
this._vignette = params.vignette;
|
|
this._monitorIndex = params.monitorIndex;
|
|
this._controlPosition = params.controlPosition;
|
|
|
|
this.backgroundActor = this._createBackgroundActor();
|
|
this._newBackgroundActor = null;
|
|
},
|
|
|
|
destroy: function() {
|
|
let cache = getBackgroundCache();
|
|
cache.releaseBackgroundSource(this._settingsSchema);
|
|
this._backgroundSource = null;
|
|
|
|
if (this._newBackgroundActor) {
|
|
this._newBackgroundActor.destroy();
|
|
this._newBackgroundActor = null;
|
|
}
|
|
|
|
if (this.backgroundActor) {
|
|
this.backgroundActor.destroy();
|
|
this.backgroundActor = null;
|
|
}
|
|
},
|
|
|
|
_swapBackgroundActor: function() {
|
|
let oldBackgroundActor = this.backgroundActor;
|
|
this.backgroundActor = this._newBackgroundActor;
|
|
this._newBackgroundActor = null;
|
|
this.emit('changed');
|
|
|
|
Tweener.addTween(oldBackgroundActor,
|
|
{ opacity: 0,
|
|
time: FADE_ANIMATION_TIME,
|
|
transition: 'easeOutQuad',
|
|
onComplete: function() {
|
|
oldBackgroundActor.destroy();
|
|
}
|
|
});
|
|
},
|
|
|
|
_updateBackgroundActor: function() {
|
|
if (this._newBackgroundActor) {
|
|
/* Skip displaying existing background queued for load */
|
|
this._newBackgroundActor.destroy();
|
|
this._newBackgroundActor = null;
|
|
}
|
|
|
|
let newBackgroundActor = this._createBackgroundActor();
|
|
newBackgroundActor.vignette_sharpness = this.backgroundActor.vignette_sharpness;
|
|
newBackgroundActor.brightness = this.backgroundActor.brightness;
|
|
newBackgroundActor.visible = this.backgroundActor.visible;
|
|
|
|
this._newBackgroundActor = newBackgroundActor;
|
|
|
|
let background = newBackgroundActor.background._delegate;
|
|
|
|
if (background.isLoaded) {
|
|
this._swapBackgroundActor();
|
|
} else {
|
|
newBackgroundActor.loadedSignalId = background.connect('loaded',
|
|
Lang.bind(this, function() {
|
|
background.disconnect(newBackgroundActor.loadedSignalId);
|
|
newBackgroundActor.loadedSignalId = 0;
|
|
|
|
this._swapBackgroundActor();
|
|
|
|
}));
|
|
}
|
|
},
|
|
|
|
_createBackgroundActor: function() {
|
|
let background = this._backgroundSource.getBackground(this._monitorIndex);
|
|
let backgroundActor = new Meta.BackgroundActor({ meta_screen: global.screen,
|
|
monitor: this._monitorIndex,
|
|
background: background.background,
|
|
vignette: this._vignette,
|
|
vignette_sharpness: 0.5,
|
|
brightness: 0.5,
|
|
});
|
|
|
|
this._container.add_child(backgroundActor);
|
|
|
|
let monitor = this._layoutManager.monitors[this._monitorIndex];
|
|
|
|
backgroundActor.set_size(monitor.width, monitor.height);
|
|
if (this._controlPosition) {
|
|
backgroundActor.set_position(monitor.x, monitor.y);
|
|
backgroundActor.lower_bottom();
|
|
}
|
|
|
|
let changeSignalId = background.connect('changed', Lang.bind(this, function() {
|
|
background.disconnect(changeSignalId);
|
|
changeSignalId = null;
|
|
this._updateBackgroundActor();
|
|
}));
|
|
|
|
backgroundActor.connect('destroy', Lang.bind(this, function() {
|
|
if (changeSignalId)
|
|
background.disconnect(changeSignalId);
|
|
|
|
if (backgroundActor.loadedSignalId)
|
|
background.disconnect(backgroundActor.loadedSignalId);
|
|
}));
|
|
|
|
return backgroundActor;
|
|
},
|
|
});
|
|
Signals.addSignalMethods(BackgroundManager.prototype);
|