Invalidate `last_primitives` on resize in `iced_tiny_skia`

1 files changed, 12 insertions, 10 deletions

diff --git a/tiny_skia/src/window/compositor.rs b/tiny_skia/src/window/compositor.rs
index 1bcce6fe..3bc06970 100644
--- a/tiny_skia/src/window/compositor.rs
+++ b/tiny_skia/src/window/compositor.rs
@@ -15,7 +15,7 @@ pub struct Surface {
     window: softbuffer::GraphicsContext,
     buffer: Vec<u32>,
     clip_mask: tiny_skia::Mask,
-    last_primitives: Vec<Primitive>,
+    last_primitives: Option<Vec<Primitive>>,
     last_background_color: Color,
 }
 
@@ -48,7 +48,7 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
             buffer: vec![0; width as usize * height as usize],
             clip_mask: tiny_skia::Mask::new(width, height)
                 .expect("Create clip mask"),
-            last_primitives: Vec::new(),
+            last_primitives: None,
             last_background_color: Color::BLACK,
         }
     }
@@ -62,8 +62,7 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
         surface.buffer.resize((width * height) as usize, 0);
         surface.clip_mask =
             tiny_skia::Mask::new(width, height).expect("Create clip mask");
-
-        surface.last_primitives.clear();
+        surface.last_primitives = None;
     }
 
     fn fetch_information(&self) -> Information {
@@ -121,17 +120,20 @@ pub fn present<T: AsRef<str>>(
     )
     .expect("Create pixel map");
 
-    let damage = if surface.last_background_color == background_color {
-        damage::list(&surface.last_primitives, primitives)
-    } else {
-        vec![Rectangle::with_size(viewport.logical_size())]
-    };
+    let damage = surface
+        .last_primitives
+        .as_deref()
+        .and_then(|last_primitives| {
+            (surface.last_background_color == background_color)
+                .then(|| damage::list(last_primitives, primitives))
+        })
+        .unwrap_or_else(|| vec![Rectangle::with_size(viewport.logical_size())]);
 
     if damage.is_empty() {
         return Ok(());
     }
 
-    surface.last_primitives = primitives.to_vec();
+    surface.last_primitives = Some(primitives.to_vec());
     surface.last_background_color = background_color;
 
     let damage = damage::group(damage, scale_factor, physical_size);