From: Grigori Goronzy <greg@blackbox>
Date: Sun, 19 Jul 2009 03:44:06 +0000 (+0200)
Subject: Fix vertical centering (VALIGN_CENTER)
X-Git-Tag: 0.9.7~37
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7690af4af50fda163ed724e8d0f3ce5d9a9ec552;p=libass

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.
---

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)