Add `window.blur` config option

Fixes #972.

3 files changed, 17 insertions, 7 deletions

diff --git a/alacritty/src/config/window.rs b/alacritty/src/config/window.rs
index 9d40b5ad..bb7c4080 100644
--- a/alacritty/src/config/window.rs
+++ b/alacritty/src/config/window.rs
@@ -48,6 +48,9 @@ pub struct WindowConfig {
     /// Background opacity from 0.0 to 1.0.
     pub opacity: Percentage,
 
+    /// Request blur behind the window.
+    pub blur: bool,
+
     /// Controls which `Option` key should be treated as `Alt`.
     #[cfg(target_os = "macos")]
     option_as_alt: OptionAsAlt,
@@ -66,17 +69,18 @@ impl Default for WindowConfig {
     fn default() -> Self {
         Self {
             dynamic_title: true,
+            blur: Default::default(),
+            embed: Default::default(),
+            padding: Default::default(),
+            opacity: Default::default(),
             position: Default::default(),
+            identity: Default::default(),
+            dimensions: Default::default(),
             decorations: Default::default(),
             startup_mode: Default::default(),
-            embed: Default::default(),
-            decorations_theme_variant: Default::default(),
             dynamic_padding: Default::default(),
-            identity: Identity::default(),
-            opacity: Default::default(),
-            padding: Default::default(),
-            dimensions: Default::default(),
             resize_increments: Default::default(),
+            decorations_theme_variant: Default::default(),
             #[cfg(target_os = "macos")]
             option_as_alt: Default::default(),
         }
diff --git a/alacritty/src/display/window.rs b/alacritty/src/display/window.rs
index 5606ca4f..f5128e75 100644
--- a/alacritty/src/display/window.rs
+++ b/alacritty/src/display/window.rs
@@ -167,6 +167,7 @@ impl Window {
             .with_theme(config.window.decorations_theme_variant)
             .with_visible(false)
             .with_transparent(true)
+            .with_blur(config.window.blur)
             .with_maximized(config.window.maximized())
             .with_fullscreen(config.window.fullscreen())
             .build(event_loop)?;
@@ -343,6 +344,10 @@ impl Window {
         self.window.set_transparent(transparent);
     }
 
+    pub fn set_blur(&self, blur: bool) {
+        self.window.set_blur(blur);
+    }
+
     pub fn set_maximized(&self, maximized: bool) {
         self.window.set_maximized(maximized);
     }
diff --git a/alacritty/src/window_context.rs b/alacritty/src/window_context.rs
index 5c017cab..a80aecca 100644
--- a/alacritty/src/window_context.rs
+++ b/alacritty/src/window_context.rs
@@ -345,8 +345,9 @@ impl WindowContext {
         #[cfg(target_os = "macos")]
         self.display.window.set_option_as_alt(self.config.window.option_as_alt());
 
-        // Change opacity state.
+        // Change opacity and blur state.
         self.display.window.set_transparent(!opaque);
+        self.display.window.set_blur(self.config.window.blur);
 
         // Update hint keys.
         self.display.hint_state.update_alphabet(self.config.hints.alphabet());