From 706f23d84180d36538c467e20b461677781cab16 Mon Sep 17 00:00:00 2001
From: rcombs <rcombs@rcombs.me>
Date: Sat, 2 Jan 2021 13:14:36 -0600
Subject: ass_render: fix aliasing when 1a=0 but 3a>0

---
 libass/ass_render.c | 3 ++-
 libass/ass_render.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/libass/ass_render.c b/libass/ass_render.c
index 64fdf58..56ed2f3 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -2012,6 +2012,7 @@ static bool parse_events(ASS_Renderer *render_priv, ASS_Event *event)
         info->frz = render_priv->state.frz;
         info->fax = render_priv->state.fax;
         info->fay = render_priv->state.fay;
+        info->fade = render_priv->state.fade;
 
         info->hspacing_scaled = double_to_d6(info->hspacing *
                 render_priv->font_scale * info->scale_x);
@@ -2325,7 +2326,7 @@ static void render_and_combine_glyphs(ASS_Renderer *render_priv,
             if ((flags & FILTER_NONZERO_BORDER &&
                  info->a_pre_fade[0] == 0 &&
                  info->a_pre_fade[1] == 0 &&
-                 _a(info->c[2]) == 0) ||
+                 info->fade == 0) ||
                 info->border_style == 3)
                 flags |= FILTER_FILL_IN_BORDER;
 
diff --git a/libass/ass_render.h b/libass/ass_render.h
index 803b577..43a7185 100644
--- a/libass/ass_render.h
+++ b/libass/ass_render.h
@@ -168,6 +168,7 @@ typedef struct glyph_info {
     unsigned italic;
     unsigned bold;
     int flags;
+    int fade;
 
     int shape_run_id;
 
-- 
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