From 514aaab8174e73629b90d6e1a8e137f586cb9ea6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20Zag=C3=B3rski?=
 <1507542+zbigg@users.noreply.github.com>
Date: Mon, 21 Oct 2024 13:44:19 +0200
Subject: [PATCH] carto: RasterLayer fix perf issue caused by spurious data
 changes (#9218)

---
 modules/carto/src/layers/raster-layer.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/modules/carto/src/layers/raster-layer.ts b/modules/carto/src/layers/raster-layer.ts
index e6afb88fb5c..6657b3d2a4a 100644
--- a/modules/carto/src/layers/raster-layer.ts
+++ b/modules/carto/src/layers/raster-layer.ts
@@ -77,6 +77,15 @@ type _RasterLayerProps = {
   tileIndex: bigint;
 };
 
+type RasterColumnLayerData = {
+  data: Raster;
+  length: number;
+};
+
+function wrappedDataComparator(oldData: RasterColumnLayerData, newData: RasterColumnLayerData) {
+  return oldData.data === newData.data && oldData.length === newData.length;
+}
+
 // Adapter layer around RasterColumnLayer that converts data & accessors into correct format
 export default class RasterLayer<DataT = any, ExtraProps = {}> extends CompositeLayer<
   Required<RasterLayerProps<DataT>> & ExtraProps
@@ -125,6 +134,7 @@ export default class RasterLayer<DataT = any, ExtraProps = {}> extends Composite
           data, // Pass through data for getSubLayerAccessor()
           length: blockSize * blockSize
         },
+        dataComparator: wrappedDataComparator,
         offset,
         highlightedObjectIndex,
         highlightColor