config: Add zoom configuration

cosmic-comp-config/src/lib.rs

@@ -48,6 +48,7 @@ pub struct CosmicCompConfig {
     pub descale_xwayland: bool,
     /// The threshold before windows snap themselves to output edges
     pub edge_snap_threshold: u32,
+    pub accessibility_zoom: ZoomConfig,
 }
 
 impl Default for CosmicCompConfig {
@@ -79,6 +80,7 @@ impl Default for CosmicCompConfig {
             focus_follows_cursor_delay: 250,
             descale_xwayland: false,
             edge_snap_threshold: 0,
+            accessibility_zoom: ZoomConfig::default(),
         }
     }
 }
@@ -124,3 +126,27 @@ fn default_repeat_rate() -> u32 {
 fn default_repeat_delay() -> u32 {
     600
 }
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
+pub struct ZoomConfig {
+    pub start_on_login: bool,
+    pub increment: u32,
+    pub view_moves: ZoomMovement,
+}
+
+impl Default for ZoomConfig {
+    fn default() -> Self {
+        ZoomConfig {
+            start_on_login: false,
+            increment: 100,
+            view_moves: ZoomMovement::OnEdge,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
+pub enum ZoomMovement {
+    OnEdge,
+    Centered,
+    Continuously,
+}