From f9283004c4f03b316e1b1cb5fe4491acd98a2a6f Mon Sep 17 00:00:00 2001
From: Grigori Goronzy <greg@blackbox>
Date: Sat, 9 Apr 2011 00:24:48 +0200
Subject: VSFilter compat: don't render shadow when glyph/border invisible

Yet another VSFilter idiosyncracy: when the glyph fill is invisible
(alpha 0xFF) and there is no border, do not render any shadow.
---
 libass/ass_render.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libass/ass_render.c b/libass/ass_render.c
index 8ca6911..2f3405e 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -1302,6 +1302,11 @@ get_bitmap_glyph(ASS_Renderer *render_priv, GlyphInfo *info)
             FT_Done_Glyph(outline);
         }
     }
+
+    // VSFilter compatibility: invisible fill and no border?
+    // In this case no shadow is supposed to be rendered.
+    if (!info->outline_glyph && (info->c[0] >> 24) == 0xFF)
+        info->bm_s = 0;
 }
 
 /**
-- 
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