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[sfnt] Try harder to find non-zero values for ascender and descender. 

* src/sfnt/sfobjs.c (sfnt_load_face): Consult `OS/2' table in case
the `hhea' table's values are zero.
This commit is contained in:
Werner Lemberg 2011-07-07 14:10:39 +02:00
parent ecdcad029f
commit f095744d2d
2 changed files with 28 additions and 25 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2011-07-07 Werner Lemberg <wl@gnu.org>
[sfnt] Try harder to find non-zero values for ascender and descender.
* src/sfnt/sfobjs.c (sfnt_load_face): Consult `OS/2' table in case
the `hhea' table's values are zero.
2011-07-03 Werner Lemberg <wl@gnu.org>
Fix previous commit.

46
src/sfnt/sfobjs.c
View File

@ -999,40 +999,36 @@
/* table cannot be used to compute the text height reliably! */
/* */
/* The ascender/descender/height are computed from the OS/2 table */
/* when found. Otherwise, they're taken from the horizontal */
/* header. */
/* */
/* The ascender and descender are taken from the `hhea' table. */
/* If zero, they are taken from the `OS/2' table. */
root->ascender = face->horizontal.Ascender;
root->descender = face->horizontal.Descender;
root->height = (FT_Short)( root->ascender - root->descender +
face->horizontal.Line_Gap );
root->height = (FT_Short)( root->ascender - root->descender +
face->horizontal.Line_Gap );
#if 0
/* if the line_gap is 0, we add an extra 15% to the text height -- */
/* this computation is based on various versions of Times New Roman */
if ( face->horizontal.Line_Gap == 0 )
root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 );
#endif /* 0 */
#if 0
/* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
/* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */
if ( face->os2.version != 0xFFFFU && root->ascender )
if ( !( root->ascender || root->descender ) )
{
FT_Int height;
if ( face->os2.version != 0xFFFFU )
{
if ( face->os2.sTypoAscender || face->os2.sTypoDescender )
{
root->ascender = face->os2.sTypoAscender;
root->descender = face->os2.sTypoDescender;
root->height = (FT_Short)( root->ascender - root->descender +
face->os2.sTypoLineGap );
}
else
{
root->ascender = (FT_Short)face->os2.usWinAscent;
root->descender = -(FT_Short)face->os2.usWinDescent;
root->ascender = face->os2.sTypoAscender;
root->descender = -face->os2.sTypoDescender;
height = root->ascender + root->descender + face->os2.sTypoLineGap;
if ( height > root->height )
root->height = height;
root->height = (FT_UShort)( root->ascender - root->descender );
}
}
}
#endif /* 0 */
root->max_advance_width = face->horizontal.advance_Width_Max;
root->max_advance_height = (FT_Short)( face->vertical_info