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Workaround for fonts with zero ascender/descender in horizontal header. 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24002 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
eugeni 2007-08-03 15:22:55 +00:00
parent 66d6320b51
commit 6f90765a40
1 changed files with 20 additions and 0 deletions
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20
libass/ass_font.c
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@ -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);