From 8ded831b9255a5807bc24a1455d332963f333232 Mon Sep 17 00:00:00 2001
From: Stanley Wang <stanleytfwang@google.com>
Date: Wed, 16 Jun 2021 17:02:34 +0800
Subject: Add the offical patch to solve the LottieAnimationView exception.

- When some illustrations are displayed, an exception
  "The Path cannot loop back on itself" occurs.

Fix: 191230018
Test: see the illustration
Change-Id: I23e58b1ad62c0c96e174427e9e8f620b2f342cbb
---
 .../com/airbnb/lottie/parser/KeyframeParser.java   | 23 ++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java b/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
index 8cd45bac..5ba38ba6 100644
--- a/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
+++ b/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
@@ -137,8 +137,27 @@ class KeyframeParser {
         interpolator = interpolatorRef.get();
       }
       if (interpolatorRef == null || interpolator == null) {
-        interpolator = PathInterpolatorCompat.create(
-            cp1.x / scale, cp1.y / scale, cp2.x / scale, cp2.y / scale);
+        cp1.x /= scale;
+        cp1.y /= scale;
+        cp2.x /= scale;
+        cp2.y /= scale;
+        try {
+          interpolator = PathInterpolatorCompat.create(cp1.x, cp1.y, cp2.x, cp2.y);
+        } catch (IllegalArgumentException e) {
+          if (e.getMessage().equals("The Path cannot loop back on itself.")) {
+            // If a control point extends beyond the previous/next point then it 
+            // will cause the value of the interpolator to no longer monotonously
+            // increase. This clips the control point bounds to prevent that from
+            // happening.
+            // NOTE: this will make the rendered animation behave slightly differently
+            // than the original.
+            interpolator = PathInterpolatorCompat.create(
+                    Math.min(cp1.x, 1f), cp1.y, Math.max(cp2.x, 0f), cp2.y);
+          } else {
+            // We failed to create the interpolator. Fall back to linear.
+            interpolator = new LinearInterpolator();
+          }
+        }            
         try {
           putInterpolator(hash, new WeakReference<>(interpolator));
         } catch (ArrayIndexOutOfBoundsException e) {
-- 
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