diff options
| -rw-r--r-- | libass/ass_font.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libass/ass_font.c b/libass/ass_font.c index 77a585fcaf..b93c41e1b1 100644 --- a/libass/ass_font.c +++ b/libass/ass_font.c @@ -89,6 +89,25 @@ static int find_font(ass_library_t* library, char* name) static void face_set_size(FT_Face face, double size); +static void buggy_font_workaround(FT_Face face) +{ + // Some fonts have zero Ascender/Descender fields in 'hhea' table. + // In this case, get the information from 'os2' table or, as + // a last resort, from face.bbox. + if (face->ascender + face->descender == 0 || face->height == 0) { + TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2); + if (os2) { + face->ascender = os2->sTypoAscender; + face->descender = os2->sTypoDescender; + face->height = face->ascender - face->descender; + } else { + face->ascender = face->bbox.yMax; + face->descender = face->bbox.yMin; + face->height = face->ascender - face->descender; + } + } +} + /** * \brief Select a face with the given charcode and add it to ass_font_t * \return index of the new face in font->faces, -1 if failed @@ -123,6 +142,7 @@ static int add_face(void* fc_priv, ass_font_t* font, uint32_t ch) } } charmap_magic(face); + buggy_font_workaround(face); font->faces[font->n_faces++] = face; update_transform(font); |