impl std::fmt::Debug for TexturesDelta

epaint/src/textures.rs

@@ -157,6 +157,10 @@ pub struct TexturesDelta {
 }
 
 impl TexturesDelta {
+    pub fn is_empty(&self) -> bool {
+        self.set.is_empty() && self.free.is_empty()
+    }
+
     pub fn append(&mut self, mut newer: TexturesDelta) {
         self.set.extend(newer.set.into_iter());
         self.free.append(&mut newer.free);
@@ -167,3 +171,32 @@ impl TexturesDelta {
         self.free.clear();
     }
 }
+
+impl std::fmt::Debug for TexturesDelta {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let mut debug_struct = f.debug_struct("TexturesDelta");
+        if !self.set.is_empty() {
+            let mut string = String::new();
+            for (tex_id, delta) in &self.set {
+                let size = delta.image.size();
+                if let Some(pos) = delta.pos {
+                    string += &format!(
+                        "{:?} partial ([{} {}] - [{} {}]), ",
+                        tex_id,
+                        pos[0],
+                        pos[1],
+                        pos[0] + size[0],
+                        pos[1] + size[1]
+                    );
+                } else {
+                    string += &format!("{:?} full {}x{}, ", tex_id, size[0], size[1]);
+                }
+            }
+            debug_struct.field("set", &string);
+        }
+        if !self.free.is_empty() {
+            debug_struct.field("free", &self.free);
+        }
+        debug_struct.finish()
+    }
+}