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Cleanup FreeType ascender/descender handling a bit

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Change-Id: I9734f15811020ce1a7b761688d602c7e244167c7
This commit is contained in:
Khaled Hosny 2013-05-11 07:07:29 +02:00
parent 5e77c9e17b
commit f9560c8f99
1 changed files with 50 additions and 18 deletions
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68
vcl/generic/glyphs/gcach_ftyp.cxx
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@ -949,16 +949,57 @@ void ServerFont::FetchFontMetric( ImplFontMetricData& rTo, long& rFactor ) const
rFactor = 0x100;
rTo.mnWidth = mnWidth;
const FT_Size_Metrics& rMetrics = maFaceFT->size->metrics;
rTo.mnAscent = (+rMetrics.ascender + 32) >> 6;
rTo.mnDescent = (-rMetrics.descender + 32) >> 6;
rTo.mnExtLeading = ((rMetrics.height + 32) >> 6) - (rTo.mnAscent + rTo.mnDescent);
rTo.mnIntLeading = (rTo.mnAscent + rTo.mnDescent) - ((maFaceFT->units_per_EM + 32) >> 6);
rTo.mnSlant = 0;
const TT_OS2* pOS2 = (const TT_OS2*)FT_Get_Sfnt_Table( maFaceFT, ft_sfnt_os2 );
const double fScale = (double)GetFontSelData().mnHeight / maFaceFT->units_per_EM;
rTo.mnAscent = 0;
rTo.mnDescent = 0;
rTo.mnExtLeading = 0;
rTo.mnSlant = 0;
rTo.mnIntLeading = (rTo.mnAscent + rTo.mnDescent) - ((maFaceFT->units_per_EM + 32) >> 6);
rTo.mnWidth = mnWidth;
// Calculating ascender and descender:
// FreeType >= 2.4.6 does the right thing, so we just use what it gives us,
// for earlier versions we emulate its behaviour; take them from 'hhea'
// table, if zero take them from 'OS/2' table.
if (nFTVERSION >= 2406)
{
const FT_Size_Metrics& rMetrics = maFaceFT->size->metrics;
rTo.mnAscent = (rMetrics.ascender + 32) >> 6;
rTo.mnDescent = (-rMetrics.descender + 32) >> 6;
rTo.mnExtLeading = ((rMetrics.height + 32) >> 6) - (rTo.mnAscent + rTo.mnDescent);
}
else
{
const TT_HoriHeader* pHHea = (const TT_HoriHeader*)FT_Get_Sfnt_Table(maFaceFT, ft_sfnt_hhea);
if (pHHea)
{
rTo.mnAscent = pHHea->Ascender * fScale + 0.5;
rTo.mnDescent = -pHHea->Descender * fScale + 0.5;
rTo.mnExtLeading = pHHea->Line_Gap * fScale + 0.5;
}
if (!(rTo.mnAscent || rTo.mnDescent))
{
if (pOS2 && (pOS2->version != 0xFFFF))
{
if (pOS2->sTypoAscender || pOS2->sTypoDescender)
{
rTo.mnAscent = pOS2->sTypoAscender * fScale + 0.5;
rTo.mnDescent = -pOS2->sTypoDescender * fScale + 0.5;
rTo.mnExtLeading = pOS2->sTypoLineGap * fScale + 0.5;
}
else
{
rTo.mnAscent = pOS2->usWinAscent * fScale + 0.5;
rTo.mnDescent = pOS2->usWinDescent * fScale + 0.5;
rTo.mnDescent = 0;
}
}
}
}
if( pOS2 && (pOS2->version != 0xFFFF) )
{
// map the panose info from the OS2 table to their VCL counterparts
@ -989,15 +1030,6 @@ void ServerFont::FetchFontMetric( ImplFontMetricData& rTo, long& rFactor ) const
case 1: // fall through
default: rTo.SetPitch( PITCH_DONTKNOW ); break;
}
const double fScale = (double)GetFontSelData().mnHeight / maFaceFT->units_per_EM;
if( pOS2->sTypoAscender || pOS2->sTypoDescender )
{
rTo.mnAscent = (long)( pOS2->sTypoAscender * fScale + 0.5 );
rTo.mnDescent = (long)( -pOS2->sTypoDescender * fScale + 0.5 );
rTo.mnExtLeading = (long)( pOS2->sTypoLineGap * fScale + 0.5 );
rTo.mnIntLeading = (long)( (pOS2->sTypoAscender - pOS2->sTypoDescender - maFaceFT->units_per_EM) * fScale + 0.5 );
}
}
// initialize kashida width