From 82893857607cd2c5c66f7d1cae0a29ef2c40f82b Mon Sep 17 00:00:00 2001
From: Hermet Park <hermet@lottiefiles.com>
Date: Sun, 29 Sep 2024 14:30:45 +0900
Subject: [PATCH] renderer/scene: rectify the render region elaboration

Properly clip the render region to the current viewport.
---
 src/renderer/tvgScene.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/renderer/tvgScene.h b/src/renderer/tvgScene.h
index 674f5a0f..cb2ef7f6 100644
--- a/src/renderer/tvgScene.h
+++ b/src/renderer/tvgScene.h
@@ -60,6 +60,7 @@ struct Scene::Impl
     list<Paint*> paints;
     RenderData rd = nullptr;
     Scene* scene = nullptr;
+    RenderRegion vport = {0, 0, INT32_MAX, INT32_MAX};
     Array<RenderEffect*>* effects = nullptr;
     uint8_t opacity;         //for composition
     bool needComp = false;   //composite or not
@@ -108,6 +109,8 @@ struct Scene::Impl
 
     RenderData update(RenderMethod* renderer, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flag, TVG_UNUSED bool clipper)
     {
+        this->vport = renderer->viewport();
+
         if ((needComp = needComposition(opacity))) {
             /* Overriding opacity value. If this scene is half-translucent,
                It must do intermediate composition with that opacity value. */
@@ -182,7 +185,10 @@ struct Scene::Impl
                 }
             }
         }
-        return {x1 + ex, y1 + ey, (x2 - x1) + ew, (y2 - y1) + eh};
+
+        auto ret = RenderRegion{x1 + ex, y1 + ey, (x2 - x1) + ew, (y2 - y1) + eh};
+        ret.intersect(this->vport);
+        return ret;
     }
 
     bool bounds(float* px, float* py, float* pw, float* ph, bool stroking)