Trim raster cache in iced_tiny_skia

tiny_skia/src/backend.rs

@@ -86,6 +86,9 @@ impl Backend {
 
         self.text_pipeline.trim_cache();
 
+        #[cfg(feature = "image")]
+        self.raster_pipeline.trim_cache();
+
         #[cfg(feature = "svg")]
         self.vector_pipeline.trim_cache();
     }

tiny_skia/src/raster.rs

@@ -52,6 +52,10 @@ impl Pipeline {
             );
         }
     }
+
+    pub fn trim_cache(&mut self) {
+        self.cache.borrow_mut().trim();
+    }
 }
 
 #[derive(Default)]
@@ -98,6 +102,11 @@ impl Cache {
             .expect("Build pixmap from image bytes")
         })
     }
+
+    fn trim(&mut self) {
+        self.entries.retain(|key, _| self.hits.contains(key));
+        self.hits.clear();
+    }
 }
 
 struct Entry {