From 9c20cb010bc65b1ac10a705187c341082d7f8cb6 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jsimmons@google.com>
Date: Fri, 25 Mar 2022 17:56:50 -0700
Subject: [PATCH] Warn about invalid arguments to ColorFilter.mode

Fixes https://github.com/flutter/flutter/issues/100702
---
 lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart | 2 +-
 lib/web_ui/lib/src/engine/canvaskit/color_filter.dart  | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart b/lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart
index 05c55d2c15561..cc1a11732c754 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart
@@ -970,7 +970,7 @@ class SkMaskFilter {
 
 @JS()
 class SkColorFilterNamespace {
-  external SkColorFilter MakeBlend(Float32List color, SkBlendMode blendMode);
+  external SkColorFilter? MakeBlend(Float32List color, SkBlendMode blendMode);
   external SkColorFilter MakeMatrix(
     Float32List matrix, // 20-element matrix
   );
diff --git a/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart b/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart
index 7c6af4760a777..de8345b4f620b 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/color_filter.dart
@@ -83,10 +83,14 @@ class CkBlendModeColorFilter extends CkColorFilter {
 
   @override
   SkColorFilter _initRawColorFilter() {
-    return canvasKit.ColorFilter.MakeBlend(
+    final SkColorFilter? filter = canvasKit.ColorFilter.MakeBlend(
       toSharedSkColor1(color),
       toSkBlendMode(blendMode),
     );
+    if (filter == null) {
+      throw ArgumentError('Invalid parameters for blend mode ColorFilter');
+    }
+    return filter;
   }
 
   @override