Deprecate the imageSmoothing option for sources

src/ol/source/TileJSON.js

@@ -40,7 +40,9 @@ import {jsonp as requestJSONP} from '../net.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 {boolean} [jsonp=false] Use JSONP with callback to load the TileJSON.
  * Useful when the server does not support CORS..
  * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).
@@ -74,11 +76,17 @@ class TileJSON extends TileImage {
    * @param {Options} options TileJSON options.
    */
   constructor(options) {
+    let interpolate =
+      options.imageSmoothing !== undefined ? options.imageSmoothing : true;
+    if (options.interpolate !== undefined) {
+      interpolate = options.interpolate;
+    }
+
     super({
       attributions: options.attributions,
       cacheSize: options.cacheSize,
       crossOrigin: options.crossOrigin,
-      imageSmoothing: options.imageSmoothing,
+      interpolate: interpolate,
       projection: getProjection('EPSG:3857'),
       reprojectionErrorThreshold: options.reprojectionErrorThreshold,
       state: SourceState.LOADING,