From 7abfd23b90db08b426c3c91b0cb6d01d161a9b9e Mon Sep 17 00:00:00 2001
From: Oleg Lokhvitsky <olegbl@fb.com>
Date: Thu, 16 May 2019 18:11:45 -0700
Subject: [PATCH] Fix error in Animated Interpolation when inputMin ===
 inputMax

Summary:
This is already handled cleanly on the JS side of things in AnimatedInterpolation.js: https://github.com/facebook/react-native/blob/0ee5f68929610106ee6864baa04ea90be0fc5160/Libraries/Animated/src/nodes/AnimatedInterpolation.js#L133-L142

However, the native driver interpolation will try to divide by 0, produce NaN and then crash. This change just copies the logic from the JS version of the interpolation logic and adds it to the Java version.

Note that this bug only reproduces on Android Q. It seems that RenderNode::setCameraDistance now crashes when receiving NaN on Android Q.

Reviewed By: sahrens

Differential Revision: D15380844

fbshipit-source-id: cfa82d8f58574e1040a851aaa5b5af1e23c9daa8
---
 .../react/animated/InterpolationAnimatedNode.java     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/animated/InterpolationAnimatedNode.java b/ReactAndroid/src/main/java/com/facebook/react/animated/InterpolationAnimatedNode.java
index 0b91c37814b..be2f38c055d 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/animated/InterpolationAnimatedNode.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/animated/InterpolationAnimatedNode.java
@@ -71,6 +71,17 @@ import javax.annotation.Nullable;
       }
     }
 
+    if (outputMin == outputMax) {
+      return outputMin;
+    }
+
+    if (inputMin == inputMax) {
+      if (value <= inputMin) {
+        return outputMin;
+      }
+      return outputMax;
+    }
+
     return outputMin + (outputMax - outputMin) *
       (result - inputMin) / (inputMax - inputMin);
   }