From c58cd622ea2d2ab54fd56533c57d9995802f7bfd Mon Sep 17 00:00:00 2001
From: Grigori Goronzy <greg@blackbox>
Date: Sat, 27 Jun 2009 14:26:15 +0200
Subject: [PATCH] Make \fax and \fay animatable.

---
 libass/ass_render.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libass/ass_render.c b/libass/ass_render.c
index 9e1c008..afea67d 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -929,13 +929,15 @@ static char *parse_tag(ass_renderer_t *render_priv, char *p, double pwr)
     } else if (mystrcmp(&p, "fax")) {
         double val;
         if (mystrtod(&p, &val))
-            render_priv->state.fax = val;
+            render_priv->state.fax =
+                val * pwr + render_priv->state.fax * (1 - pwr);
         else
             render_priv->state.fax = 0.;
     } else if (mystrcmp(&p, "fay")) {
         double val;
         if (mystrtod(&p, &val))
-            render_priv->state.fay = val;
+            render_priv->state.fay =
+                val * pwr + render_priv->state.fay * (1 - pwr);
         else
             render_priv->state.fay = 0.;
     } else if (mystrcmp(&p, "iclip")) {
-- 
2.50.1