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* src/autofit/aflatin.c (af_latin_hint_edges): Fix handling of serifs.

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This has been discovered while inspecting the auto-hinting results of
character 'Ễ' in font `arial.ttf` (version 7.00) at 13ppem.
This commit is contained in:
Werner Lemberg
2025-05-12 08:52:19 +02:00
parent 87f0b694af
commit 11432424cf
1 changed files with 63 additions and 0 deletions
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63
src/autofit/aflatin.c
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@@ -4558,9 +4558,72 @@
if ( edge->serif )
{
AF_Edge e, top, bottom;
FT_Pos min_pos, max_pos;
/* Check whether we have a real serif -- if there are */
/* other edges with overlapping (or enclosed) segments */
/* between the primary and serif edge, we have not. */
/* */
/* Such a situation might happen if an accent is very */
/* near to its base glyph (for example, Vietnamese */
/* uppercase letters with two accents in `arial.ttf`), */
/* and the segment detection algorithm classifies the */
/* top of the accent incorrectly as a serif. */
delta = edge->serif->opos - edge->opos;
if ( delta < 0 )
{
delta = -delta;
top = edge;
bottom = edge->serif;
}
else
{
top = edge->serif;
bottom = edge;
}
/* take care of outline orientation while computing extrema */
min_pos = FT_MIN( FT_MIN( FT_MIN( top->first->first->v,
top->first->last->v ),
FT_MIN( top->last->first->v,
top->last->last->v ) ),
FT_MIN( FT_MIN( bottom->first->first->v,
bottom->first->last->v ),
FT_MIN( bottom->last->first->v,
bottom->last->last->v ) ) );
max_pos = FT_MAX( FT_MAX( FT_MAX( top->first->first->v,
top->first->last->v ),
FT_MAX( top->last->first->v,
top->last->last->v ) ),
FT_MAX( FT_MAX( bottom->first->first->v,
bottom->first->last->v ),
FT_MAX( bottom->last->first->v,
bottom->last->last->v ) ) );
for ( e = bottom + 1; e < top; e++ )
{
FT_Pos e_min = FT_MIN( FT_MIN( e->first->first->v,
e->first->last->v ),
FT_MIN( e->last->first->v,
e->last->last->v ) );
FT_Pos e_max = FT_MAX( FT_MAX( e->first->first->v,
e->first->last->v ),
FT_MAX( e->last->first->v,
e->last->last->v ) );
if ( !( ( e_min < min_pos && e_max < min_pos ) ||
( e_min > max_pos && e_max > max_pos ) ) )
{
delta = 1000; /* not a real serif */
break;
}
}
if ( delta == 1000 )
continue;
}
if ( delta < 64 + 16 )