From a27839e80a1ccb5a04c157152ad883f2879fb5ad Mon Sep 17 00:00:00 2001
From: Mira Grudzinska <mira@lottiefiles.com>
Date: Wed, 21 May 2025 00:41:10 +0200
Subject: [PATCH] lottie: fix precomposition with masking

A precomposition layer is clipped to its viewport.
If the same layer also had a mask that was optimized
using clipping, this clip was unintentionally overridden
by the viewport clipping. This conflict is now fixed.
---
 src/loaders/lottie/tvgLottieBuilder.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/loaders/lottie/tvgLottieBuilder.cpp b/src/loaders/lottie/tvgLottieBuilder.cpp
index 9eddef8e..6df50b60 100644
--- a/src/loaders/lottie/tvgLottieBuilder.cpp
+++ b/src/loaders/lottie/tvgLottieBuilder.cpp
@@ -1248,8 +1248,8 @@ void LottieBuilder::updateMasks(LottieLayer* layer, float frameNo)
 {
     if (layer->masks.count == 0) return;
 
-    //Introduce an intermediate scene for embracing the matte + masking
-    if (layer->matteTarget) {
+    //Introduce an intermediate scene for embracing matte + masking or precomp clipping + masking replaced by clipping
+    if (layer->matteTarget || layer->type == LottieLayer::Precomp) {
         auto scene = Scene::gen().release();
         scene->push(cast(layer->scene));
         layer->scene = scene;