Deprecate the imageSmoothing option for sources

src/ol/source/TileWMS.js

@@ -25,7 +25,9 @@ import {hash as tileCoordHash} from '../tilecoord.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 {Object<string,*>} params WMS request parameters.
  * At least a `LAYERS` param is required. `STYLES` is
  * `''` by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX`
@@ -86,6 +88,12 @@ class TileWMS extends TileImage {
   constructor(opt_options) {
     const options = opt_options ? opt_options : /** @type {Options} */ ({});
 
+    let interpolate =
+      options.imageSmoothing !== undefined ? options.imageSmoothing : true;
+    if (options.interpolate !== undefined) {
+      interpolate = options.interpolate;
+    }
+
     const params = options.params || {};
 
     const transparent = 'TRANSPARENT' in params ? params['TRANSPARENT'] : true;
@@ -95,7 +103,7 @@ class TileWMS extends TileImage {
       attributionsCollapsible: options.attributionsCollapsible,
       cacheSize: options.cacheSize,
       crossOrigin: options.crossOrigin,
-      imageSmoothing: options.imageSmoothing,
+      interpolate: interpolate,
       opaque: !transparent,
       projection: options.projection,
       reprojectionErrorThreshold: options.reprojectionErrorThreshold,