Description: Check for layer parent-child links
Origin: https://github.com/Samsung/rlottie/pull/262/files
Author: John Preston <johnprestonmail@gmail.com>
Acked-By: Nicholas Guriev <guriev-ns@ya.ru>
Last-Update: Thu, 05 Mar 2020 21:16:01 +0300

--- a/src/lottie/lottieitem.cpp
+++ b/src/lottie/lottieitem.cpp
@@ -93,6 +93,14 @@ createLayerItem(LOTLayerData *layerData, VArenaAlloc *allocator)
     }
 }
 
+static bool isGoodParentLayer(LOTLayerItem *parent, LOTLayerItem *child) {
+    do {
+        if (parent == child) return false;
+        parent = parent->resolvedParentLayer();
+    } while (parent);
+    return true;
+}
+
 LOTCompItem::LOTCompItem(LOTModel *model)
     : mCurFrameNo(-1)
 {
@@ -455,7 +463,9 @@ LOTCompLayerItem::LOTCompLayerItem(LOTLayerData *layerModel, VArenaAlloc* alloca
             auto search =
                 std::find_if(mLayers.begin(), mLayers.end(),
                              [id](const auto &val) { return val->id() == id; });
-            if (search != mLayers.end()) layer->setParentLayer(*search);
+            if (search != mLayers.end() && isGoodParentLayer(*search, layer)) {
+                layer->setParentLayer(*search);
+            }
         }
     }
 
--- a/src/lottie/lottieitem.h
+++ b/src/lottie/lottieitem.h
@@ -150,6 +150,7 @@ public:
    LOTLayerItem(LOTLayerData *layerData);
    int id() const {return mLayerData->id();}
    int parentId() const {return mLayerData->parentId();}
+   LOTLayerItem *resolvedParentLayer() const {return mParentLayer;}
    void setParentLayer(LOTLayerItem *parent){mParentLayer = parent;}
    void setComplexContent(bool value) { mComplexContent = value;}
    bool complexContent() const {return mComplexContent;}