From 3752ad93b3197fb8373ecd84376b4d24d49c6795 Mon Sep 17 00:00:00 2001
From: Hermet Park <hermet@lottiefiles.com>
Date: Tue, 12 Sep 2023 12:30:05 +0900
Subject: [PATCH] loader/lottie: do not draw zero size content

skip rendering by setting opacity zero, if the scale factor is zero.
---
 src/loaders/lottie/tvgLottieBuilder.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/loaders/lottie/tvgLottieBuilder.cpp b/src/loaders/lottie/tvgLottieBuilder.cpp
index 3b10bd5c..9c0b6299 100644
--- a/src/loaders/lottie/tvgLottieBuilder.cpp
+++ b/src/loaders/lottie/tvgLottieBuilder.cpp
@@ -125,7 +125,9 @@ static bool _updateTransform(LottieTransform* transform, int32_t frameNo, bool a
     auto anchor = transform->anchor(frameNo);
     mathTranslateR(&matrix, -anchor.x, -anchor.y);
 
-    opacity = transform->opacity(frameNo);
+    //invisible just in case.
+    if (scale.x == 0.0f || scale.y == 0.0f) opacity = 0;
+    else opacity = transform->opacity(frameNo);
 
     return true;
 }
@@ -779,20 +781,20 @@ static void _updateLayer(LottieLayer* root, LottieLayer* layer, int32_t frameNo)
 {
     //visibility
     if (frameNo < layer->inFrame || frameNo > layer->outFrame) return;
-    auto opacity = layer->opacity(frameNo);
-    if (opacity == 0) return;
 
     _updateTransform(layer, frameNo);
 
     //Prepare render data
     layer->scene = Scene::gen().release();
-    layer->scene->transform(layer->cache.matrix);
 
     //FIXME: Ignore opacity when Null layer?
     if (layer->type != LottieLayer::Null) {
         layer->scene->opacity(layer->cache.opacity);
+        if (layer->cache.opacity == 0) return;
     }
 
+    layer->scene->transform(layer->cache.matrix);
+
     auto rFrameNo = layer->remap(frameNo);
 
     switch (layer->type) {