graphics: Unify damage clipping

inputd/src/lib.rs

@@ -1,5 +1,6 @@
 #![feature(iter_next_chunk)]
 
+use std::cmp;
 use std::fs::File;
 use std::io::{Error, Read, Write};
 use std::mem::size_of;
@@ -104,3 +105,19 @@ pub struct Damage {
     pub width: i32,
     pub height: i32,
 }
+
+impl Damage {
+    #[must_use]
+    pub fn clip(mut self, width: i32, height: i32) -> Self {
+        // Clip damage
+        self.x = cmp::min(self.x, width);
+        if self.x + self.width > width {
+            self.width -= cmp::min(self.width, width - self.x);
+        }
+        self.y = cmp::min(self.y, height);
+        if self.y + self.height > height {
+            self.height = cmp::min(self.height, height - self.y);
+        }
+        self
+    }
+}