From b26cde2527a6903d84766b0d1d3d1abf2d22f89f Mon Sep 17 00:00:00 2001
From: John Factotum <50942278+johnfactotum@users.noreply.github.com>
Date: Tue, 10 Jun 2025 20:51:27 +0800
Subject: [PATCH] FXL: don't use book viewport if it's empty

Fixes https://github.com/johnfactotum/foliate-js/issues/52#issuecomment-2956113877
---
 fixed-layout.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fixed-layout.js b/fixed-layout.js
index 21a536a..c582aba 100644
--- a/fixed-layout.js
+++ b/fixed-layout.js
@@ -18,7 +18,7 @@ const getViewport = (doc, viewport) => {
 
     // fallback to book's viewport
     if (typeof viewport === 'string') return parseViewport(viewport)
-    if (viewport) return viewport
+    if (viewport?.width && viewport.height) return viewport
 
     // if no viewport (possibly with image directly in spine), get image size
     const img = doc.querySelector('img')