Implement opacity window rule

4 files changed, 18 insertions, 2 deletions

diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index bc5c8dcf..bbca41c9 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -95,6 +95,7 @@ pub trait LayoutElement {
         renderer: &mut R,
         location: Point<i32, Logical>,
         scale: Scale<f64>,
+        alpha: f32,
     ) -> Vec<LayoutElementRenderElement<R>>;
 
     fn request_size(&self, size: Size<i32, Logical>);
@@ -1856,6 +1857,7 @@ mod tests {
             _renderer: &mut R,
             _location: Point<i32, Logical>,
             _scale: Scale<f64>,
+            _alpha: f32,
         ) -> Vec<LayoutElementRenderElement<R>> {
             vec![]
         }
diff --git a/src/layout/tile.rs b/src/layout/tile.rs
index 0609583e..faa17840 100644
--- a/src/layout/tile.rs
+++ b/src/layout/tile.rs
@@ -325,9 +325,15 @@ impl<W: LayoutElement> Tile<W> {
         view_size: Size<i32, Logical>,
         focus_ring: bool,
     ) -> impl Iterator<Item = TileRenderElement<R>> {
+        let alpha = if self.is_fullscreen {
+            1.
+        } else {
+            self.window.rules().opacity.unwrap_or(1.).clamp(0., 1.)
+        };
+
         let rv = self
             .window
-            .render(renderer, location + self.window_loc(), scale)
+            .render(renderer, location + self.window_loc(), scale, alpha)
             .into_iter()
             .map(Into::into);
 
diff --git a/src/window/mapped.rs b/src/window/mapped.rs
index a48ca636..52b9ac92 100644
--- a/src/window/mapped.rs
+++ b/src/window/mapped.rs
@@ -108,13 +108,14 @@ impl LayoutElement for Mapped {
         renderer: &mut R,
         location: Point<i32, Logical>,
         scale: Scale<f64>,
+        alpha: f32,
     ) -> Vec<LayoutElementRenderElement<R>> {
         let buf_pos = location - self.window.geometry().loc;
         self.window.render_elements(
             renderer,
             buf_pos.to_physical_precise_round(scale),
             scale,
-            1.,
+            alpha,
         )
     }
 
diff --git a/src/window/mod.rs b/src/window/mod.rs
index 63cdbe3f..ddf712b0 100644
--- a/src/window/mod.rs
+++ b/src/window/mod.rs
@@ -52,6 +52,9 @@ pub struct ResolvedWindowRules {
     ///
     /// `None` means using the SSD heuristic.
     pub draw_border_with_background: Option<bool>,
+
+    /// Extra opacity to draw this window with.
+    pub opacity: Option<f32>,
 }
 
 impl<'a> WindowRef<'a> {
@@ -82,6 +85,7 @@ impl ResolvedWindowRules {
             max_width: None,
             max_height: None,
             draw_border_with_background: None,
+            opacity: None,
         }
     }
 
@@ -153,6 +157,9 @@ impl ResolvedWindowRules {
                 if let Some(x) = rule.draw_border_with_background {
                     resolved.draw_border_with_background = Some(x);
                 }
+                if let Some(x) = rule.opacity {
+                    resolved.opacity = Some(x);
+                }
             }
 
             resolved.open_on_output = open_on_output.map(|x| x.to_owned());