From 97f3eb2d3b9eed23ef6f6129e5b0854c720a91f1 Mon Sep 17 00:00:00 2001
From: David Vacca <dvacca@fb.com>
Date: Thu, 3 Mar 2022 09:41:23 -0800
Subject: [PATCH] Ship large text measure cache in Fabric Android

Summary:
Ship large text measure cache in Fabric Android

changelog: [internal] internal

Reviewed By: sammy-SC

Differential Revision: D34602873

fbshipit-source-id: bd0a77b8b2f85301a78d528e7810938b78c7f7b8
---
 .../com/facebook/react/config/ReactFeatureFlags.java |  6 ++++++
 .../java/com/facebook/react/fabric/jni/Binding.cpp   | 12 +++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java b/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java
index e2e7da7fb19b0b..7ede3c7eb6038d 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java
@@ -100,4 +100,10 @@ public static boolean doesUseOverflowInset() {
   public static boolean insertZReorderBarriersOnViewGroupChildren = true;
 
   public static boolean enableDelayedViewStateDeletion = false;
+
+  /**
+   * Feature Flag to control the size of the cache used by TextLayoutManager in Fabric. Used from
+   * JNI.
+   */
+  public static boolean enableLargeTextMeasureCache = true;
 }
diff --git a/ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp b/ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp
index b80b5109f3010e..0b1a41e16a7534 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp
+++ b/ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp
@@ -76,6 +76,14 @@ Binding::getInspectorDataForInstance(
   return ReadableNativeMap::newObjectCxxArgs(result);
 }
 
+bool isLargeTextMeasureCacheEnabled() {
+  static const auto reactFeatureFlagsJavaDescriptor =
+      jni::findClassStatic(Binding::ReactFeatureFlagsJavaDescriptor);
+  const auto field = reactFeatureFlagsJavaDescriptor->getStaticField<jboolean>(
+      "enableLargeTextMeasureCache");
+  return reactFeatureFlagsJavaDescriptor->getStaticFieldValue(field);
+}
+
 bool isMapBufferSerializationEnabled() {
   static const auto reactFeatureFlagsJavaDescriptor =
       jni::findClassStatic(Binding::ReactFeatureFlagsJavaDescriptor);
@@ -437,9 +445,7 @@ void Binding::installFabricUIManager(
       "react_native_new_architecture:dispatch_preallocation_in_bg");
 
   contextContainer->insert(
-      "EnableLargeTextMeasureCache",
-      reactNativeConfig_->getBool(
-          "react_fabric:enable_large_text_measure_cache_android"));
+      "EnableLargeTextMeasureCache", isLargeTextMeasureCacheEnabled());
 
   auto toolbox = SchedulerToolbox{};
   toolbox.contextContainer = contextContainer;