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Properly detect medium fonts

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* src/sfntfont.c (sfnt_decode_family_style): Refer to the
preferred family and subfamily if present.
This commit is contained in:
Po Lu 2023-08-24 09:08:11 +08:00
parent a261b17e30
commit 1986484d4d
1 changed files with 21 additions and 2 deletions
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23
src/sfntfont.c
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@ -322,11 +322,30 @@ sfnt_decode_family_style (struct sfnt_name_table *name,
struct sfnt_name_record family_rec, style_rec;
unsigned char *family_data, *style_data;
family_data = sfnt_find_name (name, SFNT_NAME_FONT_FAMILY,
/* Because MS-Windows is incapable of treating font families
comprising more than four styles correctly, the TrueType
specification incorporates additional PREFERRED_FAMILY and
PREFERRED_SUBFAMILY name resources that are meant to be consulted
over the traditional family and subfamily resources. When
present within fonts supplying unusual styles, these names hold
the ``actual'' typographic family and style of the font, in lieu
of the font family with the style affixed to the front and
Regular. */
family_data = sfnt_find_name (name, SFNT_NAME_PREFERRED_FAMILY,
&family_rec);
style_data = sfnt_find_name (name, SFNT_NAME_FONT_SUBFAMILY,
if (!family_data)
family_data = sfnt_find_name (name, SFNT_NAME_FONT_FAMILY,
&family_rec);
style_data = sfnt_find_name (name, SFNT_NAME_PREFERRED_SUBFAMILY,
&style_rec);
if (!style_data)
style_data = sfnt_find_name (name, SFNT_NAME_FONT_SUBFAMILY,
&style_rec);
if (!family_data || !style_data)
return 1;