Implement place-within-backdrop layer rule

2 files changed, 25 insertions, 0 deletions

diff --git a/src/layer/mapped.rs b/src/layer/mapped.rs
index 5e62d033..78cfadbf 100644
--- a/src/layer/mapped.rs
+++ b/src/layer/mapped.rs
@@ -6,6 +6,7 @@ use smithay::backend::renderer::element::surface::{
 use smithay::backend::renderer::element::Kind;
 use smithay::desktop::{LayerSurface, PopupManager};
 use smithay::utils::{Logical, Point, Scale, Size};
+use smithay::wayland::shell::wlr_layer::{ExclusiveZone, Layer};
 
 use super::ResolvedLayerRules;
 use crate::layout::shadow::Shadow;
@@ -96,6 +97,23 @@ impl MappedLayer {
         true
     }
 
+    pub fn place_within_backdrop(&self) -> bool {
+        if !self.rules.place_within_backdrop {
+            return false;
+        }
+
+        if self.surface.layer() != Layer::Background {
+            return false;
+        }
+
+        let state = self.surface.cached_state();
+        if state.exclusive_zone != ExclusiveZone::DontCare {
+            return false;
+        }
+
+        true
+    }
+
     pub fn render<R: NiriRenderer>(
         &self,
         renderer: &mut R,
diff --git a/src/layer/mod.rs b/src/layer/mod.rs
index 36e7ee67..3b27737c 100644
--- a/src/layer/mod.rs
+++ b/src/layer/mod.rs
@@ -19,6 +19,9 @@ pub struct ResolvedLayerRules {
 
     /// Corner radius to assume this layer surface has.
     pub geometry_corner_radius: Option<CornerRadius>,
+
+    /// Whether to place this layer surface within the overview backdrop.
+    pub place_within_backdrop: bool,
 }
 
 impl ResolvedLayerRules {
@@ -37,6 +40,7 @@ impl ResolvedLayerRules {
                 inactive_color: None,
             },
             geometry_corner_radius: None,
+            place_within_backdrop: false,
         }
     }
 
@@ -73,6 +77,9 @@ impl ResolvedLayerRules {
             if let Some(x) = rule.geometry_corner_radius {
                 resolved.geometry_corner_radius = Some(x);
             }
+            if let Some(x) = rule.place_within_backdrop {
+                resolved.place_within_backdrop = x;
+            }
 
             resolved.shadow.merge_with(&rule.shadow);
         }