From 872015813c6e181900faab5d1e53bb636bf8757f Mon Sep 17 00:00:00 2001
From: Niklas Haas <git@haasn.dev>
Date: Fri, 29 Oct 2021 20:45:10 +0200
Subject: sub: assert potential pitfall

This one got me debugging for quite a while. Assert it for the future.
---
 sub/osd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sub/osd.c b/sub/osd.c
index f02693e921..b06fd242a3 100644
--- a/sub/osd.c
+++ b/sub/osd.c
@@ -506,8 +506,10 @@ void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
     int vidh = res.h - res.mt - res.mb;
     double xscale = (double)vidw / frame_w;
     double yscale = (double)vidh / frame_h;
-    if (compensate_par < 0)
+    if (compensate_par < 0) {
+        assert(res.display_par);
         compensate_par = xscale / yscale / res.display_par;
+    }
     if (compensate_par > 0)
         xscale /= compensate_par;
     int cx = vidw / 2 - (int)(frame_w * xscale) / 2;
-- 
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