Hi Nikolaus,
As a prove of concept, I tried a different approach to stem darkening,
see below. I just slapped in an adjustment of thin stem width where
the autohinter modifies them. The functional form is what I would call
smooth with most adjustment by about 1/4 between 1/2 and 1. It seems
to work.
Best,
Alexei
diff --git a/src/autofit/aflatin.c b/src/autofit/aflatin.c
index cdbc1b7..8d8de0e 100644
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -2682,16 +2682,16 @@
FT_Int vertical = ( dim == AF_DIMENSION_VERT );
- if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
- axis->extra_light )
- return width;
-
if ( dist < 0 )
{
dist = -width;
sign = 1;
}
+ if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
+ axis->extra_light )
+ goto Done_Width;
+
if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
{
@@ -2855,6 +2855,11 @@
}
Done_Width:
+
+ /* XXX: stem darkening */
+ if ( dist < 96 )
+ dist += dist * ( 96 - dist ) / 128;
+
if ( sign )
dist = -dist;
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