perf: Avoid Vector2 creation in Sprite.render

packages/flame/lib/src/sprite.dart

@@ -81,6 +81,10 @@ class Sprite {
  );
  }
 
+ // Used to avoid the creation of new Vector2 objects in render.
+ late final _tmpRenderPosition = Vector2.zero();
+ late final _tmpRenderSize = Vector2.zero();
+
  /// Renders this sprite onto the [canvas].
  ///
  /// * [position]: x,y coordinates where it will be drawn; default to origin.
@@ -97,18 +101,30 @@ class Sprite {
  Anchor anchor = Anchor.topLeft,
  Paint? overridePaint,
  }) {
- final drawPosition = position ?? Vector2.zero();
- final drawSize = size ?? srcSize;
-
- final delta = anchor.toVector2()..multiply(drawSize);
- final drawRect = (drawPosition - delta).toPositionedRect(drawSize);
+ if (position != null) {
+ _tmpRenderPosition.setFrom(position);
+ } else {
+ _tmpRenderPosition.setZero();
+ }
+
+ if (size != null) {
+ _tmpRenderSize.setFrom(size);
+ } else {
+ _tmpRenderSize.setFrom(srcSize);
+ }
+
+ _tmpRenderPosition.setValues(
+ _tmpRenderPosition.x - (anchor.x * _tmpRenderSize.x),
+ _tmpRenderPosition.y - (anchor.y * _tmpRenderSize.y),
+ );
 
+ final drawRect = _tmpRenderPosition.toPositionedRect(_tmpRenderSize);
  final drawPaint = overridePaint ?? paint;
 
  canvas.drawImageRect(image, src, drawRect, drawPaint);
  }
 
- /// Return a new Image based on the [src] of the Sprite.
+ /// Return a new [Image] based on the [src] of the Sprite.
  ///
  /// **Note:** This is a heavy async operation and should not be called inside
  /// the game loop. Remember to call dispose on the [Image] object once you