clean up

Author: donmccurdy

packages/engine/Source/Core/writeTextToCanvas.js

@@ -3,6 +3,13 @@ import Frozen from "./Frozen.js";
 import defined from "./defined.js";
 import DeveloperError from "./DeveloperError.js";
 
+/**
+ * Computes dimensions for text, based on current canvas state.
+ *
+ * Rounds metrics, excluding width, to whole pixels. This is purely to minimize
+ * rendering differences with migration to in-browser measureText(), and may be
+ * revised in the future. See: github.com/CesiumGS/cesium/pull/13081
+ */
 function measureText(context2D, textString) {
   const metrics = context2D.measureText(textString);
   const isSpace = !/\S/.test(textString);
@@ -17,10 +24,6 @@ function measureText(context2D, textString) {
     };
   }
 
-  // Round metrics, excluding width, to whole pixels. This is purely to minimize
-  // rendering differences with migration to in-browser measureText(), and may be
-  // revised in the future. See: github.com/CesiumGS/cesium/pull/13081
-
   // Baseline alignment requires `height = ascent + descent`. Rounding (if any)
   // must be done before summing, or glyph pairs like "ij" may be misaligned.
   const ascent = Math.round(metrics.actualBoundingBoxAscent);