feat(bundler): support Liquid Glass icons, closes #14207

the `icon` config now supports loading an Assets.car directly or a `.icon` (Icon Composer asset) that gets compiled into an Assets.car file

.changes/liquid-glass-icon.md

@@ -0,0 +1,5 @@
+---
+"tauri-bundler": minor:feat
+---
+
+Added support to Liquid Glass icons.

crates/tauri-bundler/src/bundle/macos/app.rs

@@ -23,7 +23,7 @@
 // files into the `Contents` directory of the bundle.
 
 use super::{
-  icon::create_icns_file,
+  icon::{app_icon_name_from_assets_car, create_assets_car_file, create_icns_file},
   sign::{notarize, notarize_auth, notarize_without_stapling, sign, SignTarget},
 };
 use crate::{
@@ -76,11 +76,19 @@ pub fn bundle_project(settings: &Settings) -> crate::Result<Vec<PathBuf>> {
   let bin_dir = bundle_directory.join("MacOS");
   let mut sign_paths = Vec::new();
 
-  let bundle_icon_file: Option<PathBuf> =
-    { create_icns_file(&resources_dir, settings).with_context(|| "Failed to create app icon")? };
+  let bundle_icon_file =
+    create_icns_file(&resources_dir, settings).with_context(|| "Failed to create app icon")?;
 
-  create_info_plist(&bundle_directory, bundle_icon_file, settings)
-    .with_context(|| "Failed to create Info.plist")?;
+  let assets_car_file = create_assets_car_file(&resources_dir, settings)
+    .with_context(|| "Failed to create app Assets.car")?;
+
+  create_info_plist(
+    &bundle_directory,
+    bundle_icon_file,
+    assets_car_file,
+    settings,
+  )
+  .with_context(|| "Failed to create Info.plist")?;
 
   let framework_paths = copy_frameworks_to_bundle(&bundle_directory, settings)
     .with_context(|| "Failed to bundle frameworks")?;
@@ -204,6 +212,7 @@ fn copy_custom_files_to_bundle(bundle_directory: &Path, settings: &Settings) ->
 fn create_info_plist(
   bundle_dir: &Path,
   bundle_icon_file: Option<PathBuf>,
+  assets_car_file: Option<PathBuf>,
   settings: &Settings,
 ) -> crate::Result<()> {
   let mut plist = plist::Dictionary::new();
@@ -213,17 +222,6 @@ fn create_info_plist(
     "CFBundleExecutable".into(),
     settings.main_binary_name()?.into(),
   );
-  if let Some(path) = bundle_icon_file {
-    plist.insert(
-      "CFBundleIconFile".into(),
-      path
-        .file_name()
-        .expect("No file name")
-        .to_string_lossy()
-        .into_owned()
-        .into(),
-    );
-  }
   plist.insert(
     "CFBundleIdentifier".into(),
     settings.bundle_identifier().into(),
@@ -362,6 +360,27 @@ fn create_info_plist(
     );
   }
 
+  if let Some(path) = bundle_icon_file {
+    plist.insert(
+      "CFBundleIconFile".into(),
+      path
+        .file_name()
+        .expect("No file name")
+        .to_string_lossy()
+        .into_owned()
+        .into(),
+    );
+  }
+
+  if let Some(assets_car_file) = assets_car_file {
+    if let Some(icon_name) = app_icon_name_from_assets_car(&assets_car_file) {
+      plist.insert("CFBundleIconName".into(), icon_name.clone().into());
+      plist.insert("CFBundleIconFile".into(), icon_name.into());
+    } else {
+      log::warn!("Failed to get icon name from Assets.car file");
+    }
+  }
+
   if let Some(protocols) = settings.deep_link_protocols() {
     plist.insert(
       "CFBundleURLTypes".into(),

crates/tauri-bundler/src/bundle/macos/icon.rs

@@ -4,13 +4,14 @@
 // SPDX-License-Identifier: MIT
 
 use crate::bundle::Settings;
-use crate::utils::{self, fs_utils};
+use crate::utils::{self, fs_utils, CommandExt};
 use std::{
   cmp::min,
   ffi::OsStr,
   fs::{self, File},
   io::{self, BufWriter},
   path::{Path, PathBuf},
+  process::Command,
 };
 
 use image::GenericImageView;
@@ -63,6 +64,11 @@ pub fn create_icns_file(out_dir: &Path, settings: &Settings) -> crate::Result<Op
   let mut images_to_resize: Vec<(image::DynamicImage, u32, u32)> = vec![];
   for icon_path in settings.icon_files() {
     let icon_path = icon_path?;
+
+    if icon_path.extension().map_or(false, |ext| ext == "car") {
+      continue;
+    }
+
     let icon = image::open(&icon_path)?;
     let density = if utils::is_retina(&icon_path) { 2 } else { 1 };
     let (w, h) = icon.dimensions();
@@ -113,3 +119,122 @@ fn make_icns_image(img: image::DynamicImage) -> io::Result<icns::Image> {
   };
   icns::Image::from_data(pixel_format, img.width(), img.height(), img.into_bytes())
 }
+
+/// Creates an Assets.car file from a .icon file if there are any in the settings.
+/// Uses an existing Assets.car file if it exists in the settings.
+/// Returns the path to the Assets.car file.
+pub fn create_assets_car_file(
+  out_dir: &Path,
+  settings: &Settings,
+) -> crate::Result<Option<PathBuf>> {
+  let Some(icons) = settings.bundle_settings().icon.as_ref() else {
+    return Ok(None);
+  };
+  // If one of the icon files is already a CAR file, just use that.
+  let mut icon_composer_icon_path = None;
+  for icon in icons {
+    let icon_path = Path::new(&icon).to_path_buf();
+    if icon_path.extension() == Some(OsStr::new("car")) {
+      let dest_path = out_dir.join("Assets.car");
+      fs_utils::copy_file(&icon_path, &dest_path)?;
+      return Ok(Some(dest_path));
+    }
+
+    if icon_path.extension() == Some(OsStr::new("icon")) {
+      icon_composer_icon_path.replace(icon_path);
+    }
+  }
+
+  let Some(icon_composer_icon_path) = icon_composer_icon_path else {
+    return Ok(None);
+  };
+
+  // Create a temporary directory for actool work
+  let temp_dir = tempfile::tempdir()
+    .map_err(|e| crate::Error::GenericError(format!("failed to create temp dir: {e}")))?;
+
+  let icon_dest_path = temp_dir.path().join("Icon.icon");
+  let output_path = temp_dir.path().join("out");
+
+  // Copy the input .icon directory to the temp directory
+  if icon_composer_icon_path.is_dir() {
+    fs_utils::copy_dir(&icon_composer_icon_path, &icon_dest_path)?;
+  } else {
+    return Err(crate::Error::GenericError(format!(
+      "{} must be a directory",
+      icon_composer_icon_path.display()
+    )));
+  }
+
+  // Create the output directory
+  fs::create_dir_all(&output_path)?;
+
+  // Run actool command
+  let mut cmd = Command::new("actool");
+  cmd.arg(&icon_dest_path);
+  cmd.arg("--compile");
+  cmd.arg(&output_path);
+  cmd.arg("--output-format");
+  cmd.arg("human-readable-text");
+  cmd.arg("--notices");
+  cmd.arg("--warnings");
+  cmd.arg("--output-partial-info-plist");
+  cmd.arg(output_path.join("assetcatalog_generated_info.plist"));
+  cmd.arg("--app-icon");
+  cmd.arg("Icon");
+  cmd.arg("--include-all-app-icons");
+  cmd.arg("--accent-color");
+  cmd.arg("AccentColor");
+  cmd.arg("--enable-on-demand-resources");
+  cmd.arg("NO");
+  cmd.arg("--development-region");
+  cmd.arg("en");
+  cmd.arg("--target-device");
+  cmd.arg("mac");
+  cmd.arg("--minimum-deployment-target");
+  cmd.arg("26.0");
+  cmd.arg("--platform");
+  cmd.arg("macosx");
+
+  cmd.output_ok()?;
+
+  let assets_car_path = output_path.join("Assets.car");
+  if !assets_car_path.exists() {
+    return Err(crate::Error::GenericError(
+      "actool did not generate Assets.car file".to_owned(),
+    ));
+  }
+
+  // copy to out_dir
+  fs_utils::copy_file(&assets_car_path, &out_dir.join("Assets.car"))?;
+
+  Ok(Some(out_dir.join("Assets.car")))
+}
+
+#[derive(serde::Deserialize)]
+struct AssetsCarInfo {
+  #[serde(rename = "AssetType", default)]
+  asset_type: String,
+  #[serde(rename = "Name", default)]
+  name: String,
+}
+
+pub fn app_icon_name_from_assets_car(assets_car_path: &Path) -> Option<String> {
+  let Ok(output) = Command::new("assetutil")
+    .arg("--info")
+    .arg(assets_car_path)
+    .output_ok()
+    .inspect_err(|e| log::error!("Failed to get app icon name from Assets.car file: {e}"))
+  else {
+    return None;
+  };
+
+  let output = String::from_utf8(output.stdout).ok()?;
+  let assets_car_info: Vec<AssetsCarInfo> = serde_json::from_str(&output)
+    .inspect_err(|e| log::error!("Failed to parse Assets.car file info: {e}"))
+    .ok()?;
+  assets_car_info
+    .iter()
+    .find(|info| info.asset_type == "Icon Image")
+    .map(|info| info.name.clone())
+}

crates/tauri-bundler/src/bundle/macos/ios.rs

@@ -106,7 +106,7 @@ fn generate_icon_files(bundle_dir: &Path, settings: &Settings) -> crate::Result<
     // Fall back to non-PNG files for any missing sizes.
     for icon_path in settings.icon_files() {
       let icon_path = icon_path?;
-      if icon_path.extension() == Some(OsStr::new("png")) {
+      if icon_path.extension().map_or(false, |ext| ext == "png" || ext == "car") {
         continue;
       } else if icon_path.extension() == Some(OsStr::new("icns")) {
         let icon_family = icns::IconFamily::read(File::open(&icon_path)?)?;

crates/tauri-bundler/src/bundle/settings.rs

@@ -795,6 +795,8 @@ pub struct Settings {
   local_tools_directory: Option<PathBuf>,
   /// the bundle settings.
   bundle_settings: BundleSettings,
+  /// Same as `bundle_settings.icon`, but without the .icon directory.
+  icon_files: Option<Vec<String>>,
   /// the binaries to bundle.
   binaries: Vec<BundleBinary>,
   /// The target platform.
@@ -906,6 +908,14 @@ impl SettingsBuilder {
     };
     let target_platform = TargetPlatform::from_triple(&target);
 
+    let icon_files = self.bundle_settings.icon.as_ref().map(|paths| {
+      paths
+        .iter()
+        .filter(|p| !p.ends_with(".icon"))
+        .cloned()
+        .collect()
+    });
+
     Ok(Settings {
       log_level: self.log_level.unwrap_or(log::Level::Error),
       package: self
@@ -925,6 +935,7 @@ impl SettingsBuilder {
           .map(|bins| external_binaries(bins, &target, &target_platform)),
         ..self.bundle_settings
       },
+      icon_files,
       target_platform,
       target,
       no_sign: self.no_sign,
@@ -1092,7 +1103,7 @@ impl Settings {
 
   /// Returns an iterator over the icon files to be used for this bundle.
   pub fn icon_files(&self) -> ResourcePaths<'_> {
-    match self.bundle_settings.icon {
+    match self.icon_files {
       Some(ref paths) => ResourcePaths::new(paths.as_slice(), false),
       None => ResourcePaths::new(&[], false),
     }