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[autofit] Fix and improve tilde centering

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* src/autofit/aflatin.c (af_glyph_hints_apply_vertical_separation_adjustments)
  Fix bug causing incorrect contour height calculation.  Change centering
  formula to be consistent with the one in af_latin_align_tildes.
This commit is contained in:
Craig White 2025-01-29 14:29:27 -05:00
parent 65d517dace
commit 323a8a2163
1 changed files with 14 additions and 4 deletions
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18
src/autofit/aflatin.c
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@ -3210,6 +3210,7 @@
{
highest_max_y = point->y;
}
point = point->next;
} while ( point != first_point );
/* If there are any contours that have a maximum y coordinate */
@ -3249,11 +3250,20 @@
}
}
if ( adjustment_amount > 0 && ( highest_max_y - highest_min_y ) < 128 && ( highest_max_y - highest_min_y ) > 100)
FT_Bool grid_aligned_after_adjustment = ( highest_min_y + adjustment_amount ) % 64 == 0;
FT_Bool is_tilde = af_lookup_tilde_correction_type( reverse_charmap, glyph_index );
FT_Pos height = highest_max_y - highest_min_y;
/* The vertical separation adjustment potentially undoes the tilde center alignment
If the vertical adjustment would grid-align a tilde less than 192 units in height,
add an offset to the vertical adjustment to re-center it. */
if ( is_tilde && grid_aligned_after_adjustment && height < 3*64)
{
adjustment_amount += ( 128 - ( highest_max_y - highest_min_y ) ) / 2;
FT_TRACE4(( " Additional push: %d\n",
( 128 - ( highest_max_y - highest_min_y ) ) / 2 ));
FT_Pos centering_adjustment = ( FT_PIX_ROUND( height ) - height ) / 2;
adjustment_amount += centering_adjustment;
FT_TRACE4(( " Additional centering: %d\n",
centering_adjustment ));
}
FT_TRACE4(( " Calculated adjustment amount: %d\n",