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Re: [ft-devel] Peculiar Hinting / Rendering Behavior

From: Alexei Podtelezhnikov
Subject: Re: [ft-devel] Peculiar Hinting / Rendering Behavior
Date: Sat, 6 Feb 2016 14:17:58 -0500

> Here's another recipe to see the artifact even better (I'm using
> msmincho.ttc from Windows 7):
>   ftgrid -f 4420 19 msmincho.ttc
> (value 4420 is the glyph index of U+56DB in this font).  After
> pressing key `a', a vertical line on the left is missing in the
> outline.  Interestingly, this happens at 100% zooming only.

This is a typical dropout situation. The following minute patch
"fixes" it. I am actually surprised that this does not happen more
often. The left edge line happens to cover two adjacent pixels at less
than 50%, which is also surprising. Deep inside, this is probably a
stroker rounding issue.

diff --git a/src/ftgrid.c b/src/ftgrid.c
index 55489b6..b4ac1a4 100644
--- a/src/ftgrid.c
+++ b/src/ftgrid.c
@@ -538,7 +538,7 @@
       FT_Stroker_New( handle->library, &st->stroker );

-      FT_Stroker_Set( st->stroker, 32, FT_STROKER_LINECAP_BUTT,
+      FT_Stroker_Set( st->stroker, 33, FT_STROKER_LINECAP_BUTT,
                       FT_STROKER_LINEJOIN_ROUND, 0x20000 );

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