From 876dc883b16a1f0123b4748b9708f1dcdaa64712 Mon Sep 17 00:00:00 2001
From: Evert Timberg <evert.timberg@gmail.com>
Date: Sun, 20 Feb 2022 10:27:28 -0500
Subject: [PATCH] Allow individual chart controllers to opt-in to the
 decimation plugin

---
 src/controllers/controller.line.js | 3 ++-
 src/core/core.datasetController.js | 1 +
 src/plugins/plugin.decimation.js   | 2 +-
 types/index.esm.d.ts               | 4 ++++
 4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/controllers/controller.line.js b/src/controllers/controller.line.js
index a62d9be895a..e610ffa4b06 100644
--- a/src/controllers/controller.line.js
+++ b/src/controllers/controller.line.js
@@ -6,8 +6,9 @@ import {_lookupByKey} from '../helpers/helpers.collection';
 export default class LineController extends DatasetController {
 
   initialize() {
-    this.enableOptionSharing = true;
     super.initialize();
+    this.enableOptionSharing = true;
+    this.supportsDecimation = true;
   }
 
   update(mode) {
diff --git a/src/core/core.datasetController.js b/src/core/core.datasetController.js
index b6c6778d999..7c3fd3b1881 100644
--- a/src/core/core.datasetController.js
+++ b/src/core/core.datasetController.js
@@ -249,6 +249,7 @@ export default class DatasetController {
     this.linkScales();
     meta._stacked = isStacked(meta.vScale, meta);
     this.addElements();
+    this.supportsDecimation = false
   }
 
   updateIndex(datasetIndex) {
diff --git a/src/plugins/plugin.decimation.js b/src/plugins/plugin.decimation.js
index 20fbb44b93a..95604e42966 100644
--- a/src/plugins/plugin.decimation.js
+++ b/src/plugins/plugin.decimation.js
@@ -217,7 +217,7 @@ export default {
         return;
       }
 
-      if (meta.type !== 'line') {
+      if (!meta.controller.supportsDecimation) {
         // Only line datasets are supported
         return;
       }
diff --git a/types/index.esm.d.ts b/types/index.esm.d.ts
index a4f463c25b1..efa73a793ed 100644
--- a/types/index.esm.d.ts
+++ b/types/index.esm.d.ts
@@ -576,6 +576,10 @@ export class DatasetController<
   readonly index: number;
   readonly _cachedMeta: ChartMeta<TElement, TDatasetElement, TType>;
   enableOptionSharing: boolean;
+  // If true, the controller supports the decimation
+  // plugin. Defaults to `false` for all controllers
+  // except the LineController
+  supportsDecimation: boolean;
 
   linkScales(): void;
   getAllParsedValues(scale: Scale): number[];