Disable image upscaling in canvas image loading (#5674)

FeodorFitsner · web-flow · commit dbcb55f8bd81 · 2025-10-02T09:38:51.000-07:00
Sets allowUpscaling to false when instantiating image codec in loadCanvasImage, preventing automatic upscaling of loaded images.
diff --git a/packages/flet/lib/src/controls/canvas.dart b/packages/flet/lib/src/controls/canvas.dart
@@ -565,7 +565,7 @@ Future<void> loadCanvasImage(Control shape) async {
       throw Exception("Missing image source: 'src' or 'src_bytes'");
     }
 
-    final codec = await ui.instantiateImageCodec(bytes);
+    final codec = await ui.instantiateImageCodec(bytes, allowUpscaling: false);
     final frame = await codec.getNextFrame();
     shape.properties["_image"] = frame.image;
     shape.updateProperties({"_hash": getImageHash(shape)},

Original file line number	Diff line number	Diff line change
`@@ -565,7 +565,7 @@ Future<void> loadCanvasImage(Control shape) async {`
`565`	`565`	`throw Exception("Missing image source: 'src' or 'src_bytes'");`
`566`	`566`	`}`
`567`	`567`
`568`		`- final codec = await ui.instantiateImageCodec(bytes);`
	`568`	`+ final codec = await ui.instantiateImageCodec(bytes, allowUpscaling: false);`
`569`	`569`	`final frame = await codec.getNextFrame();`
`570`	`570`	`shape.properties["_image"] = frame.image;`
`571`	`571`	`shape.updateProperties({"_hash": getImageHash(shape)},`