Retain surface textures for animations

src/ifs/wl_buffer.rs

@@ -310,6 +310,19 @@ impl WlBuffer {
         }
     }
 
+    pub fn get_stable_texture(&self) -> Option<Rc<dyn GfxTexture>> {
+        match &*self.storage.borrow() {
+            None => None,
+            Some(s) => match s {
+                WlBufferStorage::Shm {
+                    dmabuf_buffer_params,
+                    ..
+                } => dmabuf_buffer_params.tex.clone(),
+                WlBufferStorage::Dmabuf { tex, .. } => tex.clone(),
+            },
+        }
+    }
+
     pub fn update_texture_or_log(&self, surface: &WlSurface, sync_shm: bool) {
         if let Err(e) = self.update_texture(surface, sync_shm) {
             log::warn!("Could not update texture: {}", ErrorFmt(e));