diff --git a/hcie-iced-app/crates/hcie-iced-gui/src/app.rs b/hcie-iced-app/crates/hcie-iced-gui/src/app.rs
index 69e2a06..1cea609 100644
--- a/hcie-iced-app/crates/hcie-iced-gui/src/app.rs
+++ b/hcie-iced-app/crates/hcie-iced-gui/src/app.rs
@@ -203,6 +203,10 @@ pub struct IcedDocument {
     pub transform_drag_handle: TransformHandle,
     /// Internal clipboard for copy/paste operations
     pub internal_clipboard: Option<SelectionTransform>,
+    /// Selection mask (alpha channel) for the current selection
+    pub selection_mask: Option<Vec<u8>>,
+    /// Selection bounds (x, y, width, height)
+    pub selection_bounds: Option<(u32, u32, u32, u32)>,
     /// Crop tool state
     pub crop_state: CropState,
 }
@@ -524,6 +528,8 @@ impl HcieIcedApp {
             selection_transform: None,
             transform_drag_handle: TransformHandle::None,
             internal_clipboard: None,
+            selection_mask: None,
+            selection_bounds: None,
             crop_state: CropState::default(),
         };
 
@@ -1804,6 +1810,8 @@ impl HcieIcedApp {
                     selection_transform: None,
                     transform_drag_handle: TransformHandle::None,
                     internal_clipboard: None,
+                    selection_mask: None,
+                    selection_bounds: None,
                     crop_state: CropState::default(),
                 });
                 self.active_doc = self.documents.len() - 1;
@@ -2223,6 +2231,8 @@ impl HcieIcedApp {
                     selection_transform: None,
                     transform_drag_handle: TransformHandle::None,
                     internal_clipboard: None,
+                    selection_mask: None,
+                    selection_bounds: None,
                     crop_state: CropState::default(),
                 });
             }