feat: Windows window blur

frontends/rioterm/src/renderer/mod.rs

@@ -60,13 +60,8 @@ impl Renderer {
 
         let mut dynamic_background =
             (named_colors.background.0, named_colors.background.1, false);
-        if config.window.opacity < 1. {
-            dynamic_background.1.a = config.window.opacity as f64;
-            dynamic_background.2 = true;
-        } else if config.window.background_image.is_some() {
-            dynamic_background.1 = wgpu::Color::TRANSPARENT;
-            dynamic_background.2 = true;
-        }
+        dynamic_background.1 = wgpu::Color::TRANSPARENT;
+        dynamic_background.2 = true;
 
         let mut color_automation: HashMap<String, HashMap<String, [f32; 4]>> =
             HashMap::new();
@@ -110,6 +105,7 @@ impl Renderer {
 
         let mut foreground_color = self.compute_color(&square.fg, flags);
         let mut background_color = self.compute_bg_color(square);
+        background_color[3] = 0.0;
 
         let content = if square.c == '\t' || flags.contains(Flags::HIDDEN) {
             ' '

frontends/rioterm/src/screen/mod.rs

@@ -243,11 +243,7 @@ impl Screen<'_> {
             sugarloaf_errors,
         )?;
 
-        if cfg!(target_os = "macos") {
-            sugarloaf.set_background_color(None);
-        } else {
-            sugarloaf.set_background_color(Some(renderer.dynamic_background.1));
-        }
+        sugarloaf.set_background_color(None);
 
         if let Some(image) = &config.window.background_image {
             sugarloaf.set_background_image(image);

rio-window/src/platform_impl/windows/window.rs

@@ -137,7 +137,19 @@ impl Window {
         });
     }
 
-    pub fn set_blur(&self, _blur: bool) {}
+    pub fn set_blur(&self, blur: bool) {
+        if true { // use blur
+            let window = self.window;
+            unsafe {
+                DwmSetWindowAttribute(
+                    window,
+                    DWMWA_SYSTEMBACKDROP_TYPE as _,
+                    &BackdropType::TransientWindow as *const _ as _,
+                    4,
+                );
+            }
+        }
+    }
 
     #[inline]
     pub fn set_visible(&self, visible: bool) {