From 7690af4af50fda163ed724e8d0f3ce5d9a9ec552 Mon Sep 17 00:00:00 2001
From: Grigori Goronzy <greg@blackbox>
Date: Sun, 19 Jul 2009 05:44:06 +0200
Subject: Fix vertical centering (VALIGN_CENTER)

Match VSFilter behavior when centering non-positioned events
vertically.  Previously, libass put the event on top of the vertical
center while VSFilter centered the event evenly.  Adjust the centering
to behave like VSFilter.
---
 libass/ass_render.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libass/ass_render.c b/libass/ass_render.c
index e79c6b8..5caf8eb 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -2974,7 +2974,7 @@ ass_render_event(ass_renderer_t *render_priv, ass_event_t *event,
         } else if (valign == VALIGN_CENTER) {   // midtitle
             double scr_y =
                 y2scr(render_priv, render_priv->track->PlayResY / 2.0);
-            device_y = scr_y - (bbox.yMax - bbox.yMin) / 2.0;
+            device_y = scr_y - (bbox.yMax + bbox.yMin) / 2.0;
         } else {                // subtitle
             double scr_y;
             if (valign != VALIGN_SUB)
-- 
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