Deprecate the imageSmoothing option for sources

src/ol/source/WMTS.js

@@ -20,7 +20,9 @@ import {find, findIndex, includes} from '../array.js';
  * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that
  * you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
  * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
- * @property {boolean} [imageSmoothing=true] Enable image smoothing.
+ * @property {boolean} [imageSmoothing=true] Deprecated.  Use the `interpolate` option instead.
+ * @property {boolean} [interpolate=true] Use interpolated values when resampling.  By default,
+ * linear interpolation is used when resampling.  Set to false to use the nearest neighbor instead.
  * @property {import("../tilegrid/WMTS.js").default} tileGrid Tile grid.
  * @property {import("../proj.js").ProjectionLike} [projection] Projection. Default is the view projection.
  * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).
@@ -69,6 +71,12 @@ class WMTS extends TileImage {
    * @param {Options} options WMTS options.
    */
   constructor(options) {
+    let interpolate =
+      options.imageSmoothing !== undefined ? options.imageSmoothing : true;
+    if (options.interpolate !== undefined) {
+      interpolate = options.interpolate;
+    }
+
     // TODO: add support for TileMatrixLimits
 
     const requestEncoding =
@@ -92,7 +100,7 @@ class WMTS extends TileImage {
       attributionsCollapsible: options.attributionsCollapsible,
       cacheSize: options.cacheSize,
       crossOrigin: options.crossOrigin,
-      imageSmoothing: options.imageSmoothing,
+      interpolate: interpolate,
       projection: options.projection,
       reprojectionErrorThreshold: options.reprojectionErrorThreshold,
       tileClass: options.tileClass,