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[autofit] Support diacritics with special vertical minima.

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This code catches situations like U+1F90 ('ᾐ'), where some fonts have
exactly the same vertical minimum for the lower accent as for the base
glyph.

* src/autofit/aflatin.c (af_find_highest_contour, af_find_lowest_contour):
  Handle it.
This commit is contained in:
Werner Lemberg 2025-04-25 17:58:56 +02:00
parent 9eb6548d3d
commit d38a13dd3c
1 changed files with 14 additions and 2 deletions
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16
src/autofit/aflatin.c
View file

@ -2863,6 +2863,7 @@
af_find_highest_contour( AF_GlyphHints hints )
{
FT_Int highest_contour = 0;
FT_Pos highest_min_y = FT_INT_MAX;
FT_Pos highest_max_y = FT_INT_MIN;
FT_Int contour;
@ -2876,11 +2877,17 @@
/* highest y maximum value. */
for ( contour = 0; contour < hints->num_contours; contour++ )
{
FT_Pos current_min_y = hints->contour_y_minima[contour];
FT_Pos current_max_y = hints->contour_y_maxima[contour];
if ( current_max_y > highest_max_y )
/* If we have two contours with the same maximum value, take */
/* the one that has a smaller height. */
if ( current_max_y > highest_max_y ||
( current_max_y == highest_max_y &&
current_min_y > highest_min_y ) )
{
highest_min_y = current_min_y;
highest_max_y = current_max_y;
highest_contour = contour;
}
@ -2940,6 +2947,7 @@
{
FT_Int lowest_contour = 0;
FT_Pos lowest_min_y = FT_INT_MAX;
FT_Pos lowest_max_y = FT_INT_MIN;
FT_Int contour;
@ -2947,11 +2955,15 @@
for ( contour = 0; contour < hints->num_contours; contour++ )
{
FT_Pos current_min_y = hints->contour_y_minima[contour];
FT_Pos current_max_y = hints->contour_y_maxima[contour];
if ( current_min_y < lowest_min_y )
if ( current_min_y < lowest_min_y ||
( current_min_y == lowest_min_y &&
current_max_y < lowest_max_y ) )
{
lowest_min_y = current_min_y;
lowest_max_y = current_max_y;
lowest_contour = contour;
}
}