Defer initial playback-rate seek to ASYNC_DONE

An early seek right after set_state(PLAYING) raced the pipeline's
preroll and GStreamer silently dropped it, so a configured custom
rate only took effect after the first EOS loop-restart. Instead,
flag the pending seek and fire it from the first ASYNC_DONE bus
message, once the pipeline is actually ready to seek.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/codeql.yml

@@ -0,0 +1,99 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL Advanced"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '15 7 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    # Runner size impacts CodeQL analysis time. To learn more, please see:
+    #   - https://gh.io/recommended-hardware-resources-for-running-codeql
+    #   - https://gh.io/supported-runners-and-hardware-resources
+    #   - https://gh.io/using-larger-runners (GitHub.com only)
+    # Consider using larger runners or machines with greater resources for possible analysis time improvements.
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+    permissions:
+      # required for all workflows
+      security-events: write
+
+      # required to fetch internal or private CodeQL packs
+      packages: read
+
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: javascript-typescript
+          build-mode: none
+        # CodeQL supports the following values keywords for 'language': 'actions', 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'rust', 'swift'
+        # Use `c-cpp` to analyze code written in C, C++ or both
+        # Use 'java-kotlin' to analyze code written in Java, Kotlin or both
+        # Use 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
+        # To learn more about changing the languages that are analyzed or customizing the build mode for your analysis,
+        # see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning.
+        # If you are analyzing a compiled language, you can modify the 'build-mode' for that language to customize how
+        # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v7
+
+    # Add any setup steps before running the `github/codeql-action/init` action.
+    # This includes steps like installing compilers or runtimes (`actions/setup-node`
+    # or others). This is typically only required for manual builds.
+    # - name: Setup runtime (example)
+    #   uses: actions/setup-example@v1
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v4
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+
+        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+        # queries: security-extended,security-and-quality
+
+    # If the analyze step fails for one of the languages you are analyzing with
+    # "We were unable to automatically build your code", modify the matrix above
+    # to set the build mode to "manual" for that language. Then modify this step
+    # to build your code.
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+    - name: Run manual build steps
+      if: matrix.build-mode == 'manual'
+      shell: bash
+      run: |
+        echo 'If you are using a "manual" build mode for one or more of the' \
+          'languages you are analyzing, replace this with the commands to build' \
+          'your code, for example:'
+        echo '  make bootstrap'
+        echo '  make release'
+        exit 1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v4
+      with:
+        category: "/language:${{matrix.language}}"

README.md

@@ -1,45 +1,53 @@
 # BenthicBloom
 
-A GNOME Shell 50 extension that automatically rotates your wallpaper,
+
-supports looping video (live) wallpapers, and includes built-in
+https://github.com/user-attachments/assets/cf95d723-7c0d-44b1-9b8f-01e03f88850b
-protection against OLED burn-in.
+
+
+A GNOME Shell 50 extension that rotates your wallpaper, supports looping
+video (live) wallpapers, and protects OLED displays from burn-in.
 
 ## Features
 
-- **Auto rotation** — pick one or more folders and BenthicBloom cycles
+- **Auto rotation**: pick one or more folders and BenthicBloom cycles
-  through the images inside them on a timer, in sequential or shuffled
+  through the images inside them on a timer, sequential or shuffled, with
-  order, with an optional crossfade between changes. The chosen wallpaper
+  an optional crossfade. Can also apply to the lock screen.
-  can also be applied to the lock screen.
+- **Live wallpapers**: play a looping video or animated GIF as your
-- **Live wallpapers** — play a looping video *or animated GIF* as your
   desktop background. Frames are decoded with GStreamer and rendered
-  directly by GNOME Shell's own Clutter stage (no external, incompatible
+  directly on GNOME Shell's own Clutter stage. Playback can pause on
-  Clutter build involved). Playback can automatically pause on battery
+  battery power or while a window is fullscreen. Auto rotation suspends
-  power or while a window is fullscreen. Automatic rotation is
+  while a live wallpaper is on screen and resumes after.
-  automatically suspended while a live wallpaper is actually on screen
+- **OLED burn-in protection**, three independent toggles:
-  (and resumes afterward), since changing the static wallpaper would
-  otherwise repaint over the video.
-- **OLED burn-in protection** — three independent, individually toggled
-  techniques:
   - *Pixel shifting*: nudges the background a few pixels on a slow drift
     cycle so the same subpixels aren't lit continuously.
-  - *Idle dimming*: fades the background to a configurable lower
+  - *Idle dimming*: fades the background after the system has been idle
-    brightness after the system has been idle for a while, and restores
+    for a while, restores it when you're back.
-    it the moment you're back.
+  - *Forced rotation*: guarantees a wallpaper change after a maximum
-  - *Forced rotation*: guarantees the wallpaper changes after a maximum
+    static duration, even if auto rotation is off.
-    static duration, even if automatic rotation is otherwise switched
-    off.
 - A top-bar indicator for quick access to rotation, live wallpaper, and
-  OLED protection toggles, plus a "Next Wallpaper" action, and a full
+  OLED protection toggles, a "Next Wallpaper" action, and a full
   libadwaita preferences window.
 
 ## Requirements
 
 - GNOME Shell 50.
-- For live wallpapers: GStreamer with its `good` and `base` plugin sets
+- For live wallpapers: GStreamer's `base` and `good` plugin sets (the
-  (e.g. `gstreamer1.0-plugins-good` and `gstreamer1.0-plugins-base`, or
+  `good` set also provides GIF decoding), with GObject-Introspection data.
-  your distribution's equivalent) — the `good` set is also what provides
+  Without them the live wallpaper toggle stays disabled; everything else
-  animated GIF decoding. If these aren't installed, the live wallpaper
+  works normally.
-  toggle stays disabled and BenthicBloom's other features work normally.
+
+```sh
+# Arch
+sudo pacman -S gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly gst-libav
+
+# Debian/Ubuntu
+sudo apt install gstreamer1.0-plugins-base gstreamer1.0-plugins-good gir1.2-gst-plugins-base-1.0
+
+# Fedora
+sudo dnf install gstreamer1-plugins-base gstreamer1-plugins-good gobject-introspection
+```
+
+Restart GNOME Shell after installing (log out and back in on Wayland).
 
 ## Installation
 
@@ -51,9 +59,8 @@ cd benthicbloom
 make install
 ```
 
-Then reload GNOME Shell — press <kbd>Alt</kbd>+<kbd>F2</kbd>, type `r`,
+Reload GNOME Shell (<kbd>Alt</kbd>+<kbd>F2</kbd>, type `r`, <kbd>Enter</kbd>
-press <kbd>Enter</kbd> on X11, or log out and back in on Wayland — and
+on X11; log out and back in on Wayland), then enable the extension:
-enable the extension:
 
 ```sh
 gnome-extensions enable benthicbloom@quinta0.github.io
@@ -70,55 +77,60 @@ installable via `gnome-extensions install <file>` or the Extensions app.
 
 ## Configuration
 
-Open preferences from the panel indicator's "Wallpaper Settings…" entry,
+Open preferences from the panel indicator's "Wallpaper Settings..." entry,
 or run:
 
 ```sh
 gnome-extensions prefs benthicbloom@quinta0.github.io
 ```
 
-- **General** — panel indicator visibility, lock screen syncing, debug
+- **General**: panel indicator visibility, lock screen syncing, debug
   logging, and the folders scanned for wallpapers.
-- **Rotation** — enable/disable, interval, shuffle vs. sequential order,
+- **Rotation**: enable/disable, interval, shuffle vs. sequential order,
-  and crossfade transition settings.
+  crossfade settings.
-- **Live Wallpaper** — enable/disable, video file, source folders to pick
+- **Live Wallpaper**: enable/disable, video file, source folders, mute,
-  a video/GIF from, mute, playback speed, and power-saving pause behavior.
+  playback speed, power-saving pause behavior.
-- **OLED Protection** — master switch plus independent controls for
+- **OLED Protection**: master switch plus independent controls for pixel
-  pixel shifting, idle dimming, and forced periodic rotation.
+  shifting, idle dimming, and forced periodic rotation.
 
 ## Architecture
 
 ```
-extension.js            Entry point: wires up the three managers + indicator
+extension.js                  Entry point: wires up the three managers + indicator
-prefs.js                 libadwaita preferences window
+prefs.js                      libadwaita preferences window
-lib/settingsKeys.js       GSettings key name constants
+lib/settingsKeys.js           GSettings key name constants
-lib/logger.js             Small logging wrapper gated by the debug-logging setting
+lib/logger.js                 Small logging wrapper gated by the debug-logging setting
-lib/wallpaperSource.js    Async folder scanning for image files
+lib/wallpaperSource.js        Async folder scanning for image files
-lib/shuffleBag.js         No-immediate-repeat random ordering for shuffle mode
+lib/shuffleBag.js             No-immediate-repeat random ordering for shuffle mode
-lib/rotationManager.js    Timer-driven wallpaper rotation + crossfade overlay
+lib/rotationManager.js        Timer-driven wallpaper rotation + crossfade overlay
-lib/liveWallpaper.js      GStreamer video playback rendered onto a Clutter actor
+lib/gstreamerAvailability.js  Non-blocking GStreamer init/registry check + availability probe
-lib/oledProtection.js     Pixel shifting, idle dimming, forced rotation
+lib/liveWallpaper.js          GStreamer video playback rendered onto a Clutter actor
-lib/indicator.js          Top-bar quick-access menu
+lib/oledProtection.js         Pixel shifting, idle dimming, forced rotation
-icons/                     Bundled symbolic icons for the preferences window
+lib/indicator.js              Top-bar quick-access menu
-schemas/                  GSettings schema
+icons/                        Bundled symbolic icons for the preferences window
+schemas/                      GSettings schema
 ```
 
 ## Known limitations
 
-- The live wallpaper currently renders across the full stage as a single
+- The live wallpaper renders across the full stage as a single layer, so
-  layer, so on multi-monitor setups the video spans across all monitors
+  on multi-monitor setups the video spans all monitors as one canvas
-  as one canvas rather than being tiled per-monitor.
+  instead of being tiled per-monitor.
 - Pixel shifting and idle dimming rely on GNOME Shell's private
-  `Main.layoutManager._backgroundGroup` and `Meta.IdleMonitor` APIs, which
+  `Main.layoutManager._backgroundGroup` and `Meta.IdleMonitor` APIs, not
-  are not part of the stable extension API and could change in future
+  part of the stable extension API, and could change in future shell
-  shell versions.
+  versions.
+- GStreamer's registry scan is skipped (trusting the existing cache)
+  unless no cache exists yet, to avoid blocking gnome-shell's main thread,
+  and therefore the whole screen, for several seconds right after login.
+  A background subprocess refreshes the cache afterward so newly
+  installed plugins still become visible eventually.
 
 ## Testing
 
-This was developed and validated (JSON, GSettings schema compilation,
+This was developed and validated (JSON, GSettings schema compilation, and
-and JavaScript syntax) without a live GNOME Shell 50 session available in
+JavaScript syntax) without a live GNOME Shell 50 session available in the
-the development environment. Before relying on it, test in a nested
+development environment. Before relying on it, test in a nested session:
-session:
 
 ```sh
 dbus-run-session -- gnome-shell --nested --wayland
@@ -129,4 +141,4 @@ you hit.
 
 ## License
 
-GPL-3.0-or-later — see [LICENSE](LICENSE).
+GPL-3.0-or-later, see [LICENSE](LICENSE).

icons/bb-general-symbolic.svg

@@ -1,10 +1,10 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
-  <g fill="none" stroke="#2e3436" stroke-width="1.3" stroke-linecap="round">
+  <g fill="none" stroke="#2e3436" stroke-width="1.6" stroke-linecap="round">
     <line x1="3.5" y1="2" x2="3.5" y2="14"/>
     <line x1="8" y1="2" x2="8" y2="14"/>
     <line x1="12.5" y1="2" x2="12.5" y2="14"/>
   </g>
-  <circle cx="3.5" cy="5.5" r="1.7" fill="#2e3436"/>
+  <circle cx="3.5" cy="5.3" r="2" fill="#2e3436"/>
-  <circle cx="8" cy="10.5" r="1.7" fill="#2e3436"/>
+  <circle cx="8" cy="10.7" r="2" fill="#2e3436"/>
-  <circle cx="12.5" cy="7" r="1.7" fill="#2e3436"/>
+  <circle cx="12.5" cy="7" r="2" fill="#2e3436"/>
 </svg>

icons/bb-live-wallpaper-symbolic.svg

@@ -1,4 +1,4 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
-  <rect x="1.5" y="3" width="13" height="10" rx="1.8" fill="none" stroke="#2e3436" stroke-width="1.3"/>
+  <rect x="1.3" y="2.8" width="13.4" height="10.4" rx="2" fill="none" stroke="#2e3436" stroke-width="1.5"/>
-  <path d="M 6.6 5.8 L 6.6 10.2 L 10.4 8 Z" fill="#2e3436"/>
+  <path d="M 6.2 5.3 L 6.2 10.7 L 10.7 8 Z" fill="#2e3436"/>
 </svg>

icons/bb-rotation-symbolic.svg

@@ -1,6 +1,4 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
-  <path d="M 3.11 6.22 A 5.2 5.2 0 0 1 13.12 7.10" fill="none" stroke="#2e3436" stroke-width="1.4" stroke-linecap="round"/>
+  <path d="M 12.8 5.6 A 5.3 5.3 0 1 1 11.4 2.9" fill="none" stroke="#2e3436" stroke-width="1.6" stroke-linecap="round"/>
-  <path d="M 12.89 9.78 A 5.2 5.2 0 0 1 2.88 8.90" fill="none" stroke="#2e3436" stroke-width="1.4" stroke-linecap="round"/>
+  <path d="M 13.9,2.6 13.5,6.4 10.2,4.5 Z" fill="#2e3436"/>
-  <path d="M 13.52,9.36 11.38,7.00 14.73,6.41 Z" fill="#2e3436"/>
-  <path d="M 2.48,6.64 4.62,9.00 1.27,9.59 Z" fill="#2e3436"/>
 </svg>

lib/gstreamerAvailability.js

@@ -1,3 +1,67 @@
+import Gio from 'gi://Gio';
+import GLib from 'gi://GLib';
+
+/**
+ * True if a GStreamer plugin registry cache already exists for this user.
+ * A plain local directory listing — fast, unlike the scan below.
+ */
+function hasGstRegistryCache() {
+    const cacheDir = Gio.File.new_for_path(
+        GLib.build_filenamev([GLib.get_user_cache_dir(), 'gstreamer-1.0']));
+    try {
+        const enumerator = cacheDir.enumerate_children('standard::name', Gio.FileQueryInfoFlags.NONE, null);
+        const hasEntry = enumerator.next_file(null) !== null;
+        enumerator.close(null);
+        return hasEntry;
+    } catch (e) {
+        return false;
+    }
+}
+
+/**
+ * Gst.init() has no async variant. If its plugin registry cache is stale
+ * (e.g. right after a system update touched GStreamer packages), it
+ * synchronously rescans every plugin — spawning gst-plugin-scanner per
+ * plugin, and probing hardware for codec plugins — which can block
+ * gnome-shell's single main thread (it *is* the compositor) for many
+ * seconds, exactly the conditions right after login. That froze the entire
+ * screen the same way the blocking UPower proxy lookup did.
+ *
+ * GST_REGISTRY_UPDATE=no makes Gst.init() trust the existing cache
+ * unconditionally instead of validating it, so it returns immediately. Only
+ * set when a cache already exists — an extension-lifetime-first-ever
+ * GStreamer run on this machine still needs one real scan to have anything
+ * to trust.
+ */
+function keepGstInitFast() {
+    if (hasGstRegistryCache())
+        GLib.setenv('GST_REGISTRY_UPDATE', 'no', true);
+}
+
+/**
+ * Refreshes the on-disk registry cache in a throwaway subprocess, so a
+ * stale cache (skipped above) doesn't stay stale forever and newly
+ * installed plugins eventually become visible. Runs fully out-of-process:
+ * even if a hardware probe inside it hangs, gnome-shell is unaffected.
+ */
+function refreshGstRegistryInBackground() {
+    try {
+        const launcher = new Gio.SubprocessLauncher(
+            Gio.SubprocessFlags.STDOUT_SILENCE | Gio.SubprocessFlags.STDERR_SILENCE);
+        launcher.setenv('GST_REGISTRY_UPDATE', 'yes', true);
+        const proc = launcher.spawnv(['gst-inspect-1.0', '--exists', 'playbin']);
+        proc.wait_check_async(null, (source, result) => {
+            try {
+                source.wait_check_finish(result);
+            } catch (e) {
+                // Best-effort refresh; a missing binary or nonzero exit just leaves the cache as-is.
+            }
+        });
+    } catch (e) {
+        // Best-effort refresh; a missing gst-inspect-1.0 just leaves the cache as-is.
+    }
+}
+
 /**
  * Loads the GObject-Introspection bindings the live wallpaper feature needs
  * (Gst, GstApp for the appsink signals, Cogl for uploading decoded frames)
@@ -13,6 +77,8 @@
  * checkGstreamerBaseAvailable() there instead.
  */
 export async function loadGstreamerModules() {
+    keepGstInitFast();
+
     const [{default: Gst}, , {default: Cogl}] = await Promise.all([
         import('gi://Gst?version=1.0'),
         import('gi://GstApp?version=1.0'),
@@ -22,6 +88,8 @@ export async function loadGstreamerModules() {
     if (!Gst.is_initialized())
         Gst.init(null);
 
+    refreshGstRegistryInBackground();
+
     return {Gst, Cogl};
 }
 
@@ -33,6 +101,8 @@ export async function loadGstreamerModules() {
  * failure here is a genuine, actionable problem, unlike a Cogl probe.
  */
 export async function checkGstreamerBaseAvailable() {
+    keepGstInitFast();
+
     const [{default: Gst}] = await Promise.all([
         import('gi://Gst?version=1.0'),
         import('gi://GstApp?version=1.0'),
@@ -40,6 +110,8 @@ export async function checkGstreamerBaseAvailable() {
 
     if (!Gst.is_initialized())
         Gst.init(null);
+
+    refreshGstRegistryInBackground();
 }
 
 export const GSTREAMER_INSTALL_HINT =

lib/liveWallpaper.js

@@ -1,6 +1,7 @@
 import GLib from 'gi://GLib';
 import Gio from 'gi://Gio';
 import Clutter from 'gi://Clutter';
+import Graphene from 'gi://Graphene';
 import St from 'gi://St';
 import * as Main from 'resource:///org/gnome/shell/ui/main.js';
 
@@ -77,6 +78,9 @@ export class LiveWallpaperManager {
 
         this._settingsSignals = [];
         this._busWatchId = 0;
+        this._eosSeekTimeoutId = 0;
+        this._lastEosSeekTimeMs = 0;
+        this._pendingInitialRateSeek = false;
         this._monitorsChangedId = 0;
         this._fullscreenChangedId = 0;
         this._upowerProxy = null;
@@ -89,6 +93,9 @@ export class LiveWallpaperManager {
         this._noFrameWatchdogId = 0;
         this._imageStrategyIndex = 0;
         this._frameErrorCount = 0;
+
+        this._transitionOverlay = null;
+        this._fadeInPending = false;
     }
 
     get isAvailable() {
@@ -113,6 +120,7 @@ export class LiveWallpaperManager {
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_ENABLED}`, () => this._sync()),
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_PATH}`, () => this._sync()),
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_MUTED}`, () => this._applyMute()),
+            this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_DISPLAY_MODE}`, () => this._applyDisplayMode()),
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_PLAYBACK_RATE}`, () => this._applyPlaybackRate()),
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_PAUSE_ON_BATTERY}`, () => this._updatePauseState()),
             this._settings.connect(`changed::${SettingsKey.LIVE_WALLPAPER_PAUSE_WHEN_FULLSCREEN}`, () => this._updatePauseState())
@@ -134,6 +142,7 @@ export class LiveWallpaperManager {
         }
 
         this._stop();
+        this._clearTransition();
     }
 
     async _loadGstreamer() {
@@ -157,12 +166,27 @@ export class LiveWallpaperManager {
         if (shouldRun)
             this._active ? this._restart() : this._start();
         else if (this._active)
-            this._stop();
+            this._stop({animate: true});
     }
 
+    /**
+     * Switching to a different file while already active. If transitions
+     * are on, the outgoing actor (already showing the old file's last
+     * frame) is detached before _stop() would destroy it, so it can be
+     * kept on screen and eased away by _playTransition() after _start()
+     * has the new one playing underneath — a crossfade between the two.
+     */
     _restart() {
+        const transitionsOn = this._settings.get_boolean(SettingsKey.TRANSITION_ENABLED);
+        const outgoingActor = transitionsOn ? this._actor : null;
+        if (outgoingActor)
+            this._actor = null;
+
         this._stop();
         this._start();
+
+        if (outgoingActor)
+            this._playTransition(outgoingActor);
     }
 
     /**
@@ -233,11 +257,15 @@ export class LiveWallpaperManager {
 
         try {
             this._actor = new Clutter.Actor({
-                content_gravity: Clutter.ContentGravity.RESIZE_ASPECT,
                 reactive: false,
+                pivot_point: new Graphene.Point({x: 0.5, y: 0.5}),
             });
             Main.layoutManager._backgroundGroup.add_child(this._actor);
-            this._layoutActor();
+            this._applyDisplayMode();
+
+            this._fadeInPending = this._settings.get_boolean(SettingsKey.TRANSITION_ENABLED);
+            if (this._fadeInPending)
+                this._actor.opacity = 0;
 
             const sinkBin = this._buildSinkBin();
 
@@ -252,6 +280,17 @@ export class LiveWallpaperManager {
             this._applyMute();
             const stateChangeResult = this._playbin.set_state(Gst.State.PLAYING);
             this._logger.debug(`playbin.set_state(PLAYING) returned ${stateChangeResult}`);
+            // Seeking here immediately would race the pipeline's preroll —
+            // GStreamer can only seek once a state change has actually
+            // completed, so an early seek is silently dropped and playback
+            // sticks at native 1.0x. Instead, defer to the first ASYNC_DONE
+            // bus message (handled in _onBusMessage), which fires once the
+            // pipeline is actually ready to seek.
+            const initialRate = this._settings.get_double(SettingsKey.LIVE_WALLPAPER_PLAYBACK_RATE);
+            this._pendingInitialRateSeek = initialRate !== 1.0;
+            this._logger.debug(
+                `Live wallpaper: configured playback rate ${initialRate}, ` +
+                `deferring initial seek to ASYNC_DONE: ${this._pendingInitialRateSeek}`);
 
             this._frameCount = 0;
             this._pollCount = 0;
@@ -312,9 +351,17 @@ export class LiveWallpaperManager {
             try {
                 this._updateFrame(mapInfo.data, width, height);
                 this._frameCount++;
-                if (this._frameCount === 1)
+                if (this._frameCount === 1) {
                     this._logger.debug(`Live wallpaper: first frame received (${width}x${height})`);
-                else if (this._frameCount % 120 === 0)
+                    if (this._fadeInPending) {
+                        this._fadeInPending = false;
+                        this._actor.ease({
+                            opacity: 255,
+                            duration: this._settings.get_uint(SettingsKey.TRANSITION_DURATION_MS),
+                            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+                        });
+                    }
+                } else if (this._frameCount % 120 === 0)
                     this._logger.debug(`Live wallpaper: ${this._frameCount} frames rendered so far`);
             } finally {
                 buffer.unmap(mapInfo);
@@ -346,6 +393,7 @@ export class LiveWallpaperManager {
                     this._image = strategy.create(width, height);
                     this._videoWidth = width;
                     this._videoHeight = height;
+                    this._layoutActor();
                 }
                 strategy.upload(this._image, this._Cogl, data, width, height);
                 this._actor.set_content(this._image);
@@ -366,8 +414,15 @@ export class LiveWallpaperManager {
         const Gst = this._Gst;
         switch (message.type) {
         case Gst.MessageType.EOS:
-            this._playbin.seek_simple(
+            this._loopPlayback();
-                Gst.Format.TIME, Gst.SeekFlags.FLUSH | Gst.SeekFlags.KEY_UNIT, 0);
+            break;
+        case Gst.MessageType.ASYNC_DONE:
+            this._logger.debug(
+                `Live wallpaper: ASYNC_DONE received (pending initial rate seek: ${this._pendingInitialRateSeek})`);
+            if (this._pendingInitialRateSeek) {
+                this._pendingInitialRateSeek = false;
+                this._seekToLoopStart();
+            }
             break;
         case Gst.MessageType.ERROR: {
             const [error, debug] = message.parse_error();
@@ -389,6 +444,50 @@ export class LiveWallpaperManager {
         }
     }
 
+    /**
+     * Restarts playback at EOS. `seek()` with GST_SEEK_FLAG_FLUSH blocks
+     * the calling thread until the pipeline flushes — and since this whole
+     * extension runs on gnome-shell's own main loop, that blocks the entire
+     * desktop for as long as it takes. At rate 1.0 that's one blocking call
+     * per full playthrough, tolerable; at higher rates a short clip loops
+     * (and EOS fires) many times a second, turning it into a sustained
+     * back-to-back stall that reads as a hard freeze. Throttling to at most
+     * one restart per EOS_SEEK_MIN_INTERVAL_MS gives the main loop room to
+     * breathe between them.
+     */
+    _loopPlayback() {
+        const nowMs = GLib.get_monotonic_time() / 1000;
+        const elapsedMs = nowMs - this._lastEosSeekTimeMs;
+        const minIntervalMs = 150;
+
+        if (elapsedMs >= minIntervalMs) {
+            this._seekToLoopStart();
+            return;
+        }
+
+        if (this._eosSeekTimeoutId)
+            return;
+        this._eosSeekTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT, minIntervalMs - elapsedMs, () => {
+            this._eosSeekTimeoutId = 0;
+            this._seekToLoopStart();
+            return GLib.SOURCE_REMOVE;
+        });
+    }
+
+    _seekToLoopStart() {
+        if (!this._playbin)
+            return;
+
+        this._lastEosSeekTimeMs = GLib.get_monotonic_time() / 1000;
+        const Gst = this._Gst;
+        const rate = this._settings.get_double(SettingsKey.LIVE_WALLPAPER_PLAYBACK_RATE);
+        const ok = this._playbin.seek(
+            rate, Gst.Format.TIME, Gst.SeekFlags.FLUSH | Gst.SeekFlags.KEY_UNIT,
+            Gst.SeekType.SET, 0, Gst.SeekType.NONE, -1);
+        this._logger.debug(
+            `Live wallpaper: loop-restart seek to rate ${rate} ${ok ? 'succeeded' : 'FAILED (seek() returned false)'}`);
+    }
+
     _stateName(state) {
         const Gst = this._Gst;
         return Object.keys(Gst.State).find(name => Gst.State[name] === state) ?? String(state);
@@ -406,19 +505,74 @@ export class LiveWallpaperManager {
         const Gst = this._Gst;
         const rate = this._settings.get_double(SettingsKey.LIVE_WALLPAPER_PLAYBACK_RATE);
         const [ok, position] = this._playbin.query_position(Gst.Format.TIME);
-        if (!ok)
+        if (!ok) {
+            this._logger.debug('Live wallpaper: applyPlaybackRate aborted, query_position() failed');
             return;
+        }
 
-        this._playbin.seek(
+        const seekOk = this._playbin.seek(
             rate, Gst.Format.TIME, Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
             Gst.SeekType.SET, position, Gst.SeekType.NONE, -1);
+        this._logger.debug(
+            `Live wallpaper: applyPlaybackRate to ${rate} at position ${position} ` +
+            `${seekOk ? 'succeeded' : 'FAILED (seek() returned false)'}`);
+    }
+
+    /**
+     * Clutter's ContentGravity enum covers fit/stretch/center natively, but
+     * has no "cover" (scale-and-crop) value, so "fill" mode is done by hand:
+     * the actor is overscanned to the smallest size that fully covers the
+     * stage while preserving the video's aspect ratio, centered, and then
+     * clipped back down to the stage bounds.
+     */
+    _applyDisplayMode() {
+        if (!this._actor)
+            return;
+
+        const mode = this._settings.get_string(SettingsKey.LIVE_WALLPAPER_DISPLAY_MODE);
+        switch (mode) {
+        case 'stretch':
+            this._actor.content_gravity = Clutter.ContentGravity.RESIZE_FILL;
+            break;
+        case 'center':
+            this._actor.content_gravity = Clutter.ContentGravity.CENTER;
+            break;
+        case 'fill':
+            this._actor.content_gravity = Clutter.ContentGravity.RESIZE_FILL;
+            break;
+        case 'fit':
+        default:
+            this._actor.content_gravity = Clutter.ContentGravity.RESIZE_ASPECT;
+            break;
+        }
+
+        this._layoutActor();
     }
 
     _layoutActor() {
         if (!this._actor)
             return;
+
+        const stageWidth = global.stage.width;
+        const stageHeight = global.stage.height;
+        const mode = this._settings.get_string(SettingsKey.LIVE_WALLPAPER_DISPLAY_MODE);
+
+        if (mode === 'fill' && this._videoWidth > 0 && this._videoHeight > 0) {
+            const scale = Math.max(stageWidth / this._videoWidth, stageHeight / this._videoHeight);
+            const scaledWidth = this._videoWidth * scale;
+            const scaledHeight = this._videoHeight * scale;
+            const offsetX = (stageWidth - scaledWidth) / 2;
+            const offsetY = (stageHeight - scaledHeight) / 2;
+
+            this._actor.set_position(offsetX, offsetY);
+            this._actor.set_size(scaledWidth, scaledHeight);
+            this._actor.set_clip(-offsetX, -offsetY, stageWidth, stageHeight);
+            return;
+        }
+
+        this._actor.remove_clip();
         this._actor.set_position(0, 0);
-        this._actor.set_size(global.stage.width, global.stage.height);
+        this._actor.set_size(stageWidth, stageHeight);
     }
 
     _connectPowerWatches() {
@@ -502,7 +656,15 @@ export class LiveWallpaperManager {
         this._playbin.set_state(paused ? this._Gst.State.PAUSED : this._Gst.State.PLAYING);
     }
 
-    _stop() {
+    /**
+     * `animate: true` is for a user-visible stop (toggling the setting off,
+     * or the path being cleared) — the last frame stays on screen and eases
+     * away per the shared Transitions setting, revealing the static
+     * wallpaper beneath. Left off for restarts (which hand the actor to
+     * _playTransition() themselves, see _restart()), errors, and
+     * disable(), where an immediate teardown is what's wanted.
+     */
+    _stop({animate = false} = {}) {
         this._disconnectPowerWatches();
 
         if (this._noFrameWatchdogId) {
@@ -515,6 +677,11 @@ export class LiveWallpaperManager {
             this._pollTimeoutId = 0;
         }
 
+        if (this._eosSeekTimeoutId) {
+            GLib.source_remove(this._eosSeekTimeoutId);
+            this._eosSeekTimeoutId = 0;
+        }
+
         if (this._playbin) {
             const Gst = this._Gst;
             const bus = this._playbin.get_bus();
@@ -536,13 +703,81 @@ export class LiveWallpaperManager {
             this._appsink = null;
         }
 
-        this._actor?.destroy();
+        if (animate && this._actor && this._settings.get_boolean(SettingsKey.TRANSITION_ENABLED)) {
-        this._actor = null;
+            this._playTransition(this._actor);
+            this._actor = null;
+        } else {
+            this._actor?.destroy();
+            this._actor = null;
+        }
         this._image = null;
         this._videoWidth = 0;
         this._videoHeight = 0;
+        this._fadeInPending = false;
 
         this._setActive(false);
         this._paused = false;
     }
+
+    /**
+     * Eases `overlay` — an actor that was just detached from active duty,
+     * still showing its last frame — off screen per the Transitions
+     * setting (fade/slide/zoom/random, same styles and duration as static
+     * rotation), then destroys it. Raising it above everything else first
+     * means this works whether it's revealing a freshly started live
+     * wallpaper actor underneath (switch) or the static desktop background
+     * (stop) — both are already in place by the time this runs.
+     */
+    _playTransition(overlay) {
+        this._transitionOverlay?.destroy();
+        this._transitionOverlay = overlay;
+
+        Main.layoutManager._backgroundGroup.set_child_above_sibling(overlay, null);
+
+        const durationMs = this._settings.get_uint(SettingsKey.TRANSITION_DURATION_MS);
+        let style = this._settings.get_string(SettingsKey.TRANSITION_STYLE);
+        if (style === 'random')
+            style = ['fade', 'slide', 'zoom'][Math.floor(Math.random() * 3)];
+
+        const onComplete = () => {
+            if (this._transitionOverlay === overlay)
+                this._transitionOverlay = null;
+            overlay.destroy();
+        };
+
+        switch (style) {
+        case 'slide':
+            overlay.ease({
+                x: overlay.x - overlay.width,
+                duration: durationMs,
+                mode: Clutter.AnimationMode.EASE_IN_OUT_QUAD,
+                onComplete,
+            });
+            break;
+        case 'zoom':
+            overlay.ease({
+                scale_x: 1.15,
+                scale_y: 1.15,
+                opacity: 0,
+                duration: durationMs,
+                mode: Clutter.AnimationMode.EASE_IN_QUAD,
+                onComplete,
+            });
+            break;
+        case 'fade':
+        default:
+            overlay.ease({
+                opacity: 0,
+                duration: durationMs,
+                mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+                onComplete,
+            });
+            break;
+        }
+    }
+
+    _clearTransition() {
+        this._transitionOverlay?.destroy();
+        this._transitionOverlay = null;
+    }
 }

lib/oledProtection.js

@@ -1,6 +1,7 @@
 import GLib from 'gi://GLib';
 import Meta from 'gi://Meta';
 import Clutter from 'gi://Clutter';
+import Graphene from 'gi://Graphene';
 import * as Main from 'resource:///org/gnome/shell/ui/main.js';
 
 import {SettingsKey} from './settingsKeys.js';
@@ -13,6 +14,11 @@ const SHIFT_PATTERN = [
 
 const FORCE_ROTATION_CHECK_SECONDS = 60;
 
+// Extra margin, in pixels, added on top of the configured shift amount when
+// overscanning background actors — rounding/timing slack so a step never
+// exposes a sliver of empty stage at the trailing edge.
+const OVERSCAN_SAFETY_PX = 2;
+
 /**
  * Reduces OLED burn-in risk through three independent techniques:
  *  - pixel shifting: nudges the background actors a few px on a slow cycle
@@ -105,6 +111,7 @@ export class OledProtectionManager {
         const [dx, dy] = SHIFT_PATTERN[this._shiftStep];
 
         for (const actor of this._backgroundActors()) {
+            this._ensureOverscan(actor, amount);
             actor.ease({
                 translation_x: dx * amount,
                 translation_y: dy * amount,
@@ -114,12 +121,36 @@ export class OledProtectionManager {
         }
     }
 
+    /**
+     * Background actors (the real desktop background, and our own live
+     * wallpaper actor in most display modes) are sized to exactly cover
+     * the stage with no slack, so nudging one by a few pixels for burn-in
+     * protection would drag its edge inward and expose bare stage on the
+     * side it moved away from. Scaling the actor up slightly around its
+     * center — by just enough margin to cover the configured shift amount
+     * — keeps every edge overscanned past the stage bounds no matter which
+     * step of the shift pattern is active.
+     */
+    _ensureOverscan(actor, amount) {
+        const width = actor.width;
+        const height = actor.height;
+        if (width <= 0 || height <= 0)
+            return;
+
+        const margin = amount + OVERSCAN_SAFETY_PX;
+        actor.pivot_point = new Graphene.Point({x: 0.5, y: 0.5});
+        actor.scale_x = 1 + (2 * margin) / width;
+        actor.scale_y = 1 + (2 * margin) / height;
+    }
+
     _resetShift() {
         this._shiftStep = 0;
         for (const actor of this._backgroundActors()) {
             actor.ease({
                 translation_x: 0,
                 translation_y: 0,
+                scale_x: 1,
+                scale_y: 1,
                 duration: 500,
                 mode: Clutter.AnimationMode.EASE_OUT_QUAD,
             });

lib/rotationManager.js

@@ -2,6 +2,7 @@ import GLib from 'gi://GLib';
 import Gio from 'gi://Gio';
 import St from 'gi://St';
 import Clutter from 'gi://Clutter';
+import Graphene from 'gi://Graphene';
 import * as Main from 'resource:///org/gnome/shell/ui/main.js';
 
 import {SettingsKey} from './settingsKeys.js';
@@ -40,6 +41,7 @@ export class RotationManager {
     enable() {
         this._settingsSignals.push(
             this._settings.connect(`changed::${SettingsKey.WALLPAPER_FOLDERS}`, () => this._reloadImages()),
+            this._settings.connect(`changed::${SettingsKey.WALLPAPER_RESCAN_REQUEST}`, () => this._reloadImages()),
             this._settings.connect(`changed::${SettingsKey.ROTATION_ENABLED}`, () => this._restartTimer()),
             this._settings.connect(`changed::${SettingsKey.ROTATION_INTERVAL_SECONDS}`, () => this._restartTimer()),
             this._settings.connect(`changed::${SettingsKey.ROTATION_MODE}`, () => this._onModeChanged())
@@ -185,7 +187,7 @@ export class RotationManager {
         const uri = GLib.filename_to_uri(path, null);
 
         if (this._settings.get_boolean(SettingsKey.TRANSITION_ENABLED) && previousPath)
-            this._playCrossfade(previousPath);
+            this._playTransition(previousPath);
 
         this._backgroundSettings.set_string('picture-uri', uri);
         if (this._backgroundSettings.settings_schema.has_key('picture-uri-dark'))
@@ -200,15 +202,19 @@ export class RotationManager {
     }
 
     /**
-     * The real background actor doesn't crossfade on its own, so we paint the
+     * The real background actor doesn't animate changes on its own, so we
-     * *old* image full-screen on a throwaway overlay right as the new image
+     * paint the *old* image full-screen on a throwaway overlay right as the
-     * is set underneath, then fade the overlay out to reveal it.
+     * new image is set underneath, then animate the overlay away to reveal
+     * it. Which animation runs is picked per monitor by style.
      */
-    _playCrossfade(previousPath) {
+    _playTransition(previousPath) {
         this._clearTransitionOverlays();
 
         const durationMs = this._settings.get_uint(SettingsKey.TRANSITION_DURATION_MS);
         const uri = GLib.filename_to_uri(previousPath, null).replace(/"/g, '%22');
+        let style = this._settings.get_string(SettingsKey.TRANSITION_STYLE);
+        if (style === 'random')
+            style = ['fade', 'slide', 'zoom'][Math.floor(Math.random() * 3)];
 
         for (const monitor of Main.layoutManager.monitors) {
             const overlay = new St.Widget({
@@ -217,23 +223,49 @@ export class RotationManager {
                 y: monitor.y,
                 width: monitor.width,
                 height: monitor.height,
+                pivot_point: new Graphene.Point({x: 0.5, y: 0.5}),
                 style: `background-image: url("${uri}"); background-size: cover; background-position: center;`,
                 opacity: 255,
             });
             Main.layoutManager._backgroundGroup.add_child(overlay);
             this._transitionOverlays.push(overlay);
 
-            overlay.ease({
+            const onComplete = () => {
-                opacity: 0,
+                overlay.destroy();
-                duration: durationMs,
+                const idx = this._transitionOverlays.indexOf(overlay);
-                mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+                if (idx >= 0)
-                onComplete: () => {
+                    this._transitionOverlays.splice(idx, 1);
-                    overlay.destroy();
+            };
-                    const idx = this._transitionOverlays.indexOf(overlay);
+
-                    if (idx >= 0)
+            switch (style) {
-                        this._transitionOverlays.splice(idx, 1);
+            case 'slide':
-                },
+                overlay.ease({
-            });
+                    x: monitor.x - monitor.width,
+                    duration: durationMs,
+                    mode: Clutter.AnimationMode.EASE_IN_OUT_QUAD,
+                    onComplete,
+                });
+                break;
+            case 'zoom':
+                overlay.ease({
+                    scale_x: 1.15,
+                    scale_y: 1.15,
+                    opacity: 0,
+                    duration: durationMs,
+                    mode: Clutter.AnimationMode.EASE_IN_QUAD,
+                    onComplete,
+                });
+                break;
+            case 'fade':
+            default:
+                overlay.ease({
+                    opacity: 0,
+                    duration: durationMs,
+                    mode: Clutter.AnimationMode.EASE_OUT_QUAD,
+                    onComplete,
+                });
+                break;
+            }
         }
     }
 

lib/settingsKeys.js

@@ -2,6 +2,7 @@ export const SettingsKey = Object.freeze({
     SHOW_INDICATOR: 'show-indicator',
     DEBUG_LOGGING: 'debug-logging',
     WALLPAPER_FOLDERS: 'wallpaper-folders',
+    WALLPAPER_RESCAN_REQUEST: 'wallpaper-rescan-request',
     APPLY_TO_LOCK_SCREEN: 'apply-to-lock-screen',
 
     ROTATION_ENABLED: 'rotation-enabled',
@@ -10,10 +11,12 @@ export const SettingsKey = Object.freeze({
     CURRENT_INDEX: 'current-index',
     TRANSITION_ENABLED: 'transition-enabled',
     TRANSITION_DURATION_MS: 'transition-duration-ms',
+    TRANSITION_STYLE: 'transition-style',
 
     LIVE_WALLPAPER_ENABLED: 'live-wallpaper-enabled',
     LIVE_WALLPAPER_PATH: 'live-wallpaper-path',
     LIVE_WALLPAPER_FOLDERS: 'live-wallpaper-folders',
+    LIVE_WALLPAPER_DISPLAY_MODE: 'live-wallpaper-display-mode',
     LIVE_WALLPAPER_MUTED: 'live-wallpaper-muted',
     LIVE_WALLPAPER_PLAYBACK_RATE: 'live-wallpaper-playback-rate',
     LIVE_WALLPAPER_PAUSE_ON_BATTERY: 'live-wallpaper-pause-on-battery',

metadata.json

@@ -7,5 +7,5 @@
     "settings-schema": "org.gnome.shell.extensions.benthicbloom",
     "gettext-domain": "benthicbloom",
     "version": 1,
-    "version-name": "1.0.0"
+    "version-name": "1.0.1"
 }

prefs.js

@@ -9,6 +9,25 @@ import {SettingsKey} from './lib/settingsKeys.js';
 import {checkGstreamerBaseAvailable, GSTREAMER_INSTALL_HINT} from './lib/gstreamerAvailability.js';
 import {listMediaFilesInFolders} from './lib/wallpaperSource.js';
 
+const BACKGROUND_SCHEMA = 'org.gnome.desktop.background';
+
+// GNOME's own picture-options values, exposed here so wallpaper fill mode
+// can be controlled without inventing a parallel setting of our own.
+// Built lazily (not at module top level) because gettext can only be
+// called once the extension is registered, which hasn't happened yet
+// while this module is still being evaluated on import.
+function pictureOptions() {
+    return [
+        {value: 'zoom', label: _('Fill (Crop to Zoom)')},
+        {value: 'scaled', label: _('Fit (No Cropping)')},
+        {value: 'stretched', label: _('Stretch')},
+        {value: 'centered', label: _('Centered')},
+        {value: 'wallpaper', label: _('Tiled')},
+        {value: 'spanned', label: _('Spanned Across Monitors')},
+        {value: 'none', label: _('None (Background Color Only)')},
+    ];
+}
+
 export default class BenthicBloomPreferences extends ExtensionPreferences {
     async fillPreferencesWindow(window) {
         const settings = this.getSettings();
@@ -19,8 +38,10 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
         // blank/broken-image placeholder in the page switcher.
         Gtk.IconTheme.get_for_display(window.get_display()).add_search_path(`${this.path}/icons`);
 
+        const backgroundSettings = new Gio.Settings({schema_id: BACKGROUND_SCHEMA});
+
         window.set_default_size(640, 720);
-        window.add(this._buildGeneralPage(settings));
+        window.add(this._buildGeneralPage(settings, backgroundSettings));
         window.add(this._buildRotationPage(settings));
         window.add(this._buildLiveWallpaperPage(settings, gstreamerError));
         window.add(this._buildOledPage(settings));
@@ -47,7 +68,7 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
 
     // --- General page ------------------------------------------------
 
-    _buildGeneralPage(settings) {
+    _buildGeneralPage(settings, backgroundSettings) {
         const page = new Adw.PreferencesPage({title: _('General'), icon_name: 'bb-general-symbolic'});
 
         const behaviorGroup = new Adw.PreferencesGroup({title: _('Behavior')});
@@ -62,6 +83,23 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
             settings, SettingsKey.DEBUG_LOGGING,
             _('Debug Logging'), _('Print verbose diagnostics to the system log (journalctl -f)')));
 
+        const displayGroup = new Adw.PreferencesGroup({
+            title: _('Display'),
+            description: _('How the wallpaper image is fitted to your screen, e.g. cropped to fill it'),
+        });
+        page.add(displayGroup);
+        const pictureOptionsList = pictureOptions();
+        const fillModeRow = new Adw.ComboRow({
+            title: _('Fill Mode'),
+            model: new Gtk.StringList({strings: pictureOptionsList.map(o => o.label)}),
+        });
+        const currentOption = backgroundSettings.get_string('picture-options');
+        fillModeRow.selected = Math.max(0, pictureOptionsList.findIndex(o => o.value === currentOption));
+        fillModeRow.connect('notify::selected', () => {
+            backgroundSettings.set_string('picture-options', pictureOptionsList[fillModeRow.selected].value);
+        });
+        displayGroup.add(fillModeRow);
+
         const foldersGroup = new Adw.PreferencesGroup({
             title: _('Wallpaper Folders'),
             description: _('Images found directly inside these folders are used for rotation'),
@@ -71,15 +109,18 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
         const folderList = this._buildFolderListBox(settings, SettingsKey.WALLPAPER_FOLDERS, _('No folders added yet'));
         foldersGroup.add(folderList);
 
-        const addButton = new Gtk.Button({
+        const buttonRow = new Gtk.Box({orientation: Gtk.Orientation.HORIZONTAL, spacing: 6, margin_top: 6});
-            label: _('Add Folder…'),
+        foldersGroup.add(buttonRow);
-            halign: Gtk.Align.START,
+
-            margin_top: 6,
+        const addButton = new Gtk.Button({label: _('Add Folder…'), css_classes: ['flat']});
-            css_classes: ['flat'],
-        });
         addButton.connect('clicked', () => this._pickFolderForList(
             settings, SettingsKey.WALLPAPER_FOLDERS, folderList, _('No folders added yet')));
-        foldersGroup.add(addButton);
+        buttonRow.append(addButton);
+
+        const refreshButton = new Gtk.Button({label: _('Refresh'), css_classes: ['flat']});
+        refreshButton.connect('clicked', () => settings.set_uint(
+            SettingsKey.WALLPAPER_RESCAN_REQUEST, settings.get_uint(SettingsKey.WALLPAPER_RESCAN_REQUEST) + 1));
+        buttonRow.append(refreshButton);
 
         return page;
     }
@@ -174,7 +215,17 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
         page.add(transitionGroup);
         transitionGroup.add(this._switchRow(
             settings, SettingsKey.TRANSITION_ENABLED,
-            _('Crossfade'), _('Smoothly fade between wallpapers instead of switching instantly')));
+            _('Enable Transition'), _('Play an animation between wallpapers instead of switching instantly')));
+
+        const styles = ['fade', 'slide', 'zoom', 'random'];
+        const styleLabels = [_('Fade'), _('Slide'), _('Zoom'), _('Random')];
+        const styleRow = new Adw.ComboRow({title: _('Style'), model: new Gtk.StringList({strings: styleLabels})});
+        styleRow.selected = Math.max(0, styles.indexOf(settings.get_string(SettingsKey.TRANSITION_STYLE)));
+        styleRow.connect('notify::selected', () => {
+            settings.set_string(SettingsKey.TRANSITION_STYLE, styles[styleRow.selected]);
+        });
+        transitionGroup.add(styleRow);
+
         transitionGroup.add(this._spinRow(
             {title: _('Fade Duration'), subtitle: _('Milliseconds'), lower: 200, upper: 5000, step: 100, page: 500},
             () => settings.get_uint(SettingsKey.TRANSITION_DURATION_MS),
@@ -251,6 +302,19 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
         fileRow.add_suffix(chooseButton);
         group.add(fileRow);
 
+        const liveDisplayModes = ['fit', 'fill', 'stretch', 'center'];
+        const liveDisplayLabels = [_('Fit (Letterboxed)'), _('Fill (Crop to Cover)'), _('Stretch'), _('Center')];
+        const displayModeRow = new Adw.ComboRow({
+            title: _('Display Mode'),
+            model: new Gtk.StringList({strings: liveDisplayLabels}),
+        });
+        displayModeRow.selected = Math.max(
+            0, liveDisplayModes.indexOf(settings.get_string(SettingsKey.LIVE_WALLPAPER_DISPLAY_MODE)));
+        displayModeRow.connect('notify::selected', () => {
+            settings.set_string(SettingsKey.LIVE_WALLPAPER_DISPLAY_MODE, liveDisplayModes[displayModeRow.selected]);
+        });
+        group.add(displayModeRow);
+
         const muteRow = this._switchRow(
             settings, SettingsKey.LIVE_WALLPAPER_MUTED,
             _('Mute Audio'), _('Play video wallpapers without sound'));
@@ -283,15 +347,17 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
             settings, SettingsKey.LIVE_WALLPAPER_FOLDERS, _('No folders added yet'), refreshMedia);
         foldersGroup.add(liveFolderList);
 
-        const addFolderButton = new Gtk.Button({
+        const liveButtonRow = new Gtk.Box({orientation: Gtk.Orientation.HORIZONTAL, spacing: 6, margin_top: 6});
-            label: _('Add Folder…'),
+        foldersGroup.add(liveButtonRow);
-            halign: Gtk.Align.START,
+
-            margin_top: 6,
+        const addFolderButton = new Gtk.Button({label: _('Add Folder…'), css_classes: ['flat']});
-            css_classes: ['flat'],
-        });
         addFolderButton.connect('clicked', () => this._pickFolderForList(
             settings, SettingsKey.LIVE_WALLPAPER_FOLDERS, liveFolderList, _('No folders added yet'), refreshMedia));
-        foldersGroup.add(addFolderButton);
+        liveButtonRow.append(addFolderButton);
+
+        const refreshMediaButton = new Gtk.Button({label: _('Refresh'), css_classes: ['flat']});
+        refreshMediaButton.connect('clicked', refreshMedia);
+        liveButtonRow.append(refreshMediaButton);
 
         refreshMedia();
 
@@ -309,6 +375,7 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
         // GStreamer is actually driving playback is greyed out.
         if (gstreamerError) {
             fileRow.sensitive = false;
+            displayModeRow.sensitive = false;
             muteRow.sensitive = false;
             rateRow.sensitive = false;
             foldersGroup.sensitive = false;
@@ -394,9 +461,12 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
             settings, SettingsKey.OLED_PIXEL_SHIFT_ENABLED,
             _('Enable Pixel Shifting'), _('Periodically nudge the background by a few pixels')));
         shiftGroup.add(this._spinRow(
-            {title: _('Shift Interval'), subtitle: _('Seconds between each shift step'), lower: 10, upper: 600, step: 5, page: 30},
+            {
-            () => settings.get_uint(SettingsKey.OLED_PIXEL_SHIFT_INTERVAL_SECONDS),
+                title: _('Shift Interval'), subtitle: _('Minutes between each shift step'),
-            value => settings.set_uint(SettingsKey.OLED_PIXEL_SHIFT_INTERVAL_SECONDS, Math.round(value))));
+                lower: 0.5, upper: 10, step: 0.5, page: 1, digits: 1,
+            },
+            () => settings.get_uint(SettingsKey.OLED_PIXEL_SHIFT_INTERVAL_SECONDS) / 60,
+            value => settings.set_uint(SettingsKey.OLED_PIXEL_SHIFT_INTERVAL_SECONDS, Math.round(value * 60))));
         shiftGroup.add(this._spinRow(
             {title: _('Shift Amount'), subtitle: _('Pixels'), lower: 1, upper: 10, step: 1, page: 1},
             () => settings.get_uint(SettingsKey.OLED_PIXEL_SHIFT_AMOUNT_PX),
@@ -408,9 +478,9 @@ export default class BenthicBloomPreferences extends ExtensionPreferences {
             settings, SettingsKey.OLED_DIM_ON_IDLE_ENABLED,
             _('Dim When Idle'), _('Lower brightness after a period of inactivity')));
         dimGroup.add(this._spinRow(
-            {title: _('Idle Delay'), subtitle: _('Seconds of inactivity before dimming'), lower: 10, upper: 3600, step: 10, page: 60},
+            {title: _('Idle Delay'), subtitle: _('Minutes of inactivity before dimming'), lower: 1, upper: 60, step: 1, page: 5},
-            () => settings.get_uint(SettingsKey.OLED_DIM_IDLE_DELAY_SECONDS),
+            () => settings.get_uint(SettingsKey.OLED_DIM_IDLE_DELAY_SECONDS) / 60,
-            value => settings.set_uint(SettingsKey.OLED_DIM_IDLE_DELAY_SECONDS, Math.round(value))));
+            value => settings.set_uint(SettingsKey.OLED_DIM_IDLE_DELAY_SECONDS, Math.round(value * 60))));
         dimGroup.add(this._spinRow(
             {
                 title: _('Dimmed Brightness'), subtitle: _('0.0 = black, 0.9 = barely dimmed'),

schemas/org.gnome.shell.extensions.benthicbloom.gschema.xml

@@ -21,6 +21,12 @@
       <description>List of folder paths scanned for wallpaper images.</description>
     </key>
 
+    <key name="wallpaper-rescan-request" type="u">
+      <default>0</default>
+      <summary>Wallpaper folder rescan request</summary>
+      <description>Internal counter bumped by the preferences UI to ask the running extension to rescan wallpaper folders for new files.</description>
+    </key>
+
     <key name="apply-to-lock-screen" type="b">
       <default>true</default>
       <summary>Apply wallpaper to lock screen</summary>
@@ -67,6 +73,18 @@
       <description>Duration, in milliseconds, of the crossfade animation between wallpapers.</description>
     </key>
 
+    <key name="transition-style" type="s">
+      <choices>
+        <choice value="fade"/>
+        <choice value="slide"/>
+        <choice value="zoom"/>
+        <choice value="random"/>
+      </choices>
+      <default>"fade"</default>
+      <summary>Transition style</summary>
+      <description>Visual effect used when the wallpaper changes.</description>
+    </key>
+
     <key name="live-wallpaper-enabled" type="b">
       <default>false</default>
       <summary>Enable live wallpaper</summary>
@@ -85,6 +103,18 @@
       <description>List of folder paths scanned for videos and animated GIFs to pick a live wallpaper from.</description>
     </key>
 
+    <key name="live-wallpaper-display-mode" type="s">
+      <choices>
+        <choice value="fit"/>
+        <choice value="fill"/>
+        <choice value="stretch"/>
+        <choice value="center"/>
+      </choices>
+      <default>"fit"</default>
+      <summary>Live wallpaper display mode</summary>
+      <description>How the video/GIF is fitted to the screen: fit (letterboxed), fill (cropped to cover), stretch (distorted to fill) or center (original size).</description>
+    </key>
+
     <key name="live-wallpaper-muted" type="b">
       <default>true</default>
       <summary>Mute live wallpaper audio</summary>