Cleanup svg decoder

lib/src/decoders/svg_decoder.dart

@@ -35,33 +35,42 @@ class SvgDecoder implements CursorDecoder {
     } on Exception {
       throw const FormatException("invalid svg data");
     }
-    final width = pictureInfo.size.width;
-    final height = pictureInfo.size.height;
+
+    final double width = pictureInfo.size.width;
+    final double height = pictureInfo.size.height;
     if (width <= 0 || height <= 0) {
       pictureInfo.picture.dispose();
       throw const FormatException("svg has no size");
     }
 
-    final target = options.targetSize;
-    final ratio = target != null
+    final double? target = options.targetSize;
+    final double ratio = target != null
         ? (target > _maxSize ? _maxSize.toDouble() : target) / width
         : _shrinkRatio(width, height, options.maxSize);
-    final finalWidth = (width * ratio).round().clamp(1, _maxSize * 32);
-    final finalHeight = (height * ratio).round().clamp(1, _maxSize * 32);
+    final int finalWidth = (width * ratio).round().clamp(1, _maxSize * 32);
+    final int finalHeight = (height * ratio).round().clamp(1, _maxSize * 32);
 
     final recorder = ui.PictureRecorder();
     final canvas = ui.Canvas(recorder);
     canvas.scale(ratio, ratio);
     canvas.drawPicture(pictureInfo.picture);
-    final picture = recorder.endRecording();
-    final image = await picture.toImage(finalWidth, finalHeight);
+    final ui.Picture picture = recorder.endRecording();
+    final ui.Image image = await picture.toImage(finalWidth, finalHeight);
     picture.dispose();
     pictureInfo.picture.dispose();
 
     final hotspot = options.hotspot ?? ui.Offset.zero;
-    final hotX = (hotspot.dx * ratio).round().clamp(0, finalWidth - 1);
-    final hotY = (hotspot.dy * ratio).round().clamp(0, finalHeight - 1);
-    return StaticCursor(Cursor(image: image, hotspotX: hotX, hotspotY: hotY));
+
+    final int hotX = (hotspot.dx * ratio).round().clamp(0, finalWidth - 1);
+    final int hotY = (hotspot.dy * ratio).round().clamp(0, finalHeight - 1);
+
+    return StaticCursor(
+      Cursor(
+        image: image,
+        hotspotX: hotX,
+        hotspotY: hotY,
+      ),
+    );
   }
 
   /// Raster-size cap for generated SVG cursors.