sc135-otf-kerning.diff (14,990 bytes)
Index: scribus/fonts/scface_ttf.cpp
===================================================================
--- scribus/fonts/scface_ttf.cpp (revision 16352)
+++ scribus/fonts/scface_ttf.cpp (working copy)
@@ -8,6 +8,7 @@
#include <QFile>
#include <QString>
#include <QObject>
+#include <QDebug>
#include <sys/types.h>
@@ -16,8 +17,365 @@
#include "util.h"
#include "scconfig.h"
+KernFeature::KernFeature ( FT_Face face )
+ :m_valid ( true )
+{
+ FontName = QString ( face->family_name ) + " " + QString ( face->style_name ) ;
+// qDebug() <<"KF"<<FontName;
+// QTime t;
+// t.start();
+ FT_ULong length = 0;
+ if ( !FT_Load_Sfnt_Table ( face, TTAG_GPOS , 0, NULL, &length ) )
+ {
+// qDebug() <<"\t"<<"GPOS table len"<<length;
+ if ( length > 32 )
+ {
+ GPOSTableRaw.resize ( length );
+ FT_Load_Sfnt_Table ( face, TTAG_GPOS, 0, reinterpret_cast<FT_Byte*> ( GPOSTableRaw.data() ), &length );
+ makeCoverage();
+ }
+ else
+ m_valid = false;
+ GPOSTableRaw.clear();
+ coverages.clear();
+ }
+ else
+ m_valid = false;
+
+ if ( !m_valid )
+ pairs.clear();
+// qDebug() <<"\t"<<m_valid;
+// qDebug() <<"\t"<<t.elapsed();
+}
+
+KernFeature::KernFeature ( const KernFeature & kf )
+{
+ m_valid = kf.m_valid;
+ if ( m_valid )
+ pairs = kf.pairs;
+
+}
+
+
+KernFeature::~ KernFeature()
+{
+}
+
+double KernFeature::getPairValue ( unsigned int glyph1, unsigned int glyph2 ) const
+{
+ if ( m_valid )
+ {
+ if ( pairs.contains ( glyph1 ) )
+ {
+ if ( pairs[glyph1].contains ( glyph2 ) )
+ {
+ return pairs[glyph1][glyph2];
+ }
+ }
+ }
+ return 0.0;
+}
+
+void KernFeature::makeCoverage()
+{
+ if ( GPOSTableRaw.isEmpty() )
+ return;
+
+ quint16 FeatureList_Offset= toUint16 ( 6 );
+ quint16 LookupList_Offset = toUint16 ( 8 );
+
+ // Find the offsets of the kern feature tables
+ quint16 FeatureCount = toUint16 ( FeatureList_Offset );;
+ QList<quint16> FeatureKern_Offset;
+ for ( quint16 FeatureRecord ( 0 ); FeatureRecord < FeatureCount; ++ FeatureRecord )
+ {
+ int rawIdx ( FeatureList_Offset + 2 + ( 6 * FeatureRecord ) );
+ quint32 tag ( FT_MAKE_TAG ( GPOSTableRaw.at ( rawIdx ),
+ GPOSTableRaw.at ( rawIdx + 1 ),
+ GPOSTableRaw.at ( rawIdx + 2 ),
+ GPOSTableRaw.at ( rawIdx + 3 ) ) );
+ if ( tag == TTAG_kern )
+ {
+ FeatureKern_Offset << ( toUint16 ( rawIdx + 4 ) + FeatureList_Offset );
+
+ }
+ }
+
+ // Extract indices of lookups for feture kern
+ QList<quint16> LookupListIndex;
+ foreach ( quint16 kern, FeatureKern_Offset )
+ {
+ quint16 LookupCount ( toUint16 ( kern + 2 ) );
+ for ( int llio ( 0 ) ; llio < LookupCount; ++llio )
+ {
+ quint16 Idx ( toUint16 ( kern + 4 + ( llio * 2 ) ) );
+ if ( !LookupListIndex.contains ( Idx ) )
+ {
+ LookupListIndex <<Idx ;
+ }
+ }
+ }
+
+
+ // Extract offsets of lookup tables for feature kern
+ QList<quint16> LookupTables;
+ QList<quint16> PairAdjustmentSubTables;
+ for ( int i ( 0 ); i < LookupListIndex.count(); ++i )
+ {
+ int rawIdx ( LookupList_Offset + 2 + ( LookupListIndex[i] * 2 ) );
+ quint16 Lookup ( toUint16 ( rawIdx ) + LookupList_Offset );
+ quint16 SubTableCount ( toUint16 ( Lookup + 4 ) );
+ for ( int stIdx ( 0 ); stIdx < SubTableCount; ++ stIdx )
+ {
+ quint16 SubTable ( toUint16 ( Lookup + 6 + ( 2 * stIdx ) ) + Lookup );
+
+// quint16 PosFormat ( toUint16 ( SubTable ) );
+ quint16 Coverage_Offset ( toUint16 ( SubTable + 2 ) + SubTable );
+ quint16 CoverageFormat ( toUint16 ( Coverage_Offset ) );
+
+ if ( 1 == CoverageFormat ) // glyph indices based
+ {
+ quint16 GlyphCount ( toUint16 ( Coverage_Offset + 2 ) );
+ quint16 GlyphID ( Coverage_Offset + 4 );
+
+ for ( unsigned int gl ( 0 ); gl < GlyphCount; ++gl )
+ {
+ coverages[SubTable] << toUint16 ( GlyphID + ( gl * 2 ) );
+ }
+ }
+ else if ( 2 == CoverageFormat ) // Coverage Format2 => ranges based
+ {
+ quint16 RangeCount ( toUint16 ( Coverage_Offset + 2 ) );
+
+// int gl_base ( 0 );
+ for ( int r ( 0 ); r < RangeCount; ++r )
+ {
+ quint16 rBase ( Coverage_Offset + 4 + ( r * 6 ) );
+ quint16 Start ( toUint16 ( rBase ) );
+ quint16 End ( toUint16 ( rBase + 2 ) );
+// quint16 StartCoverageIndex ( toUint16 ( rBase + 4 ) );
+ for ( unsigned int gl ( Start ); gl <= End; ++gl )
+ coverages[SubTable] << gl;
+ }
+ }
+ else
+ {
+// qDebug() <<"Unknow Coverage Format:"<<CoverageFormat;
+ continue;
+ }
+
+ makePairs ( SubTable );
+ }
+
+ }
+
+
+}
+
+
+void KernFeature::makePairs ( quint16 subtableOffset )
+{
+ /*
+ Lookup Type 2:
+ Pair Adjustment Positioning Subtable
+ */
+
+ quint16 PosFormat ( toUint16 ( subtableOffset ) );
+
+ if ( PosFormat == 1 )
+ {
+ quint16 ValueFormat1 ( toUint16 ( subtableOffset +4 ) );
+ quint16 ValueFormat2 ( toUint16 ( subtableOffset +6 ) );
+ quint16 PairSetCount ( toUint16 ( subtableOffset +8 ) );
+ if ( ValueFormat1 && ValueFormat2 )
+ {
+ for ( int psIdx ( 0 ); psIdx < PairSetCount; ++ psIdx )
+ {
+ unsigned int FirstGlyph ( coverages[subtableOffset][psIdx] );
+ quint16 PairSetOffset ( toUint16 ( subtableOffset +10 + ( 2 * psIdx ) ) + subtableOffset );
+ quint16 PairValueCount ( toUint16 ( PairSetOffset ) );
+ quint16 PairValueRecord ( PairSetOffset + 2 );
+ for ( int pvIdx ( 0 );pvIdx < PairValueCount; ++pvIdx )
+ {
+ quint16 recordBase ( PairValueRecord + ( ( 2 + 2 + 2 ) * pvIdx ) );
+ quint16 SecondGlyph ( toUint16 ( recordBase ) );
+ qint16 Value1 ( toInt16 ( recordBase + 2 ) );
+ pairs[FirstGlyph][SecondGlyph] = double ( Value1 );
+
+ }
+
+ }
+ }
+ else if ( ValueFormat1 && ( !ValueFormat2 ) )
+ {
+ for ( int psIdx ( 0 ); psIdx < PairSetCount; ++ psIdx )
+ {
+ unsigned int FirstGlyph ( coverages[subtableOffset][psIdx] );
+ quint16 PairSetOffset ( toUint16 ( subtableOffset +10 + ( 2 * psIdx ) ) + subtableOffset );
+ quint16 PairValueCount ( toUint16 ( PairSetOffset ) );
+ quint16 PairValueRecord ( PairSetOffset + 2 );
+ for ( int pvIdx ( 0 );pvIdx < PairValueCount; ++pvIdx )
+ {
+ quint16 recordBase ( PairValueRecord + ( ( 2 + 2 ) * pvIdx ) );
+ quint16 SecondGlyph ( toUint16 ( recordBase ) );
+ qint16 Value1 ( toInt16 ( recordBase + 2 ) );
+ pairs[FirstGlyph][SecondGlyph] = double ( Value1 );
+
+ }
+
+ }
+ }
+ else
+ {
+// qDebug() <<"ValueFormat1 is null or both ValueFormat1 and ValueFormat2 are null";
+ }
+
+ }
+ else if ( PosFormat == 2 )
+ {
+ quint16 ValueFormat1 ( toUint16 ( subtableOffset +4 ) );
+ quint16 ValueFormat2 ( toUint16 ( subtableOffset +6 ) );
+ quint16 ClassDef1 ( toUint16 ( subtableOffset +8 ) + subtableOffset );
+ quint16 ClassDef2 ( toUint16 ( subtableOffset +10 ) + subtableOffset );
+ quint16 Class1Count ( toUint16 ( subtableOffset +12 ) );
+ quint16 Class2Count ( toUint16 ( subtableOffset +14 ) );
+ quint16 Class1Record ( subtableOffset +16 );
+
+ // first extract classses
+ ClassDefTable Class1Data ( getClass ( ClassDef1 , subtableOffset ) );
+ ClassDefTable Class2Data ( getClass ( ClassDef2 , subtableOffset ) );
+
+ if ( ValueFormat1 && ValueFormat2 )
+ {
+ for ( quint16 C1 ( 0 );C1 < Class1Count; ++C1 )
+ {
+ QList<quint16> Class1 ( Class1Data[C1] );
+ quint16 Class2Record ( Class1Record + ( C1 * ( 2 * 2 * Class2Count ) ) );
+ for ( quint16 C2 ( 0 );C2 < Class2Count; ++C2 )
+ {
+ qint16 Value1 ( toInt16 ( Class2Record + ( C2 * ( 2 * 2 ) ) ) );
+ QList<quint16> Class2 ( Class2Data[C2] );
+ // keep it barbarian :D
+ foreach ( quint16 FirstGlyph, Class1 )
+ {
+ foreach ( quint16 SecondGlyph, Class2 )
+ {
+ if ( Value1 )
+ pairs[FirstGlyph][SecondGlyph] = double ( Value1 );
+ }
+ }
+ }
+ }
+ }
+ else if ( ValueFormat1 && ( !ValueFormat2 ) )
+ {
+ for ( quint16 C1 ( 0 );C1 < Class1Count; ++C1 )
+ {
+ QString cdbg ( QString::number ( C1 ).rightJustified ( 5,QChar ( 32 ) ) );
+ QList<quint16> Class1 ( Class1Data[C1] );
+ quint16 Class2Record ( Class1Record + ( C1 * ( 2 * Class2Count ) ) );
+ for ( quint16 C2 ( 0 );C2 < Class2Count; ++C2 )
+ {
+ qint16 Value1 ( toInt16 ( Class2Record + ( C2 * 2 ) ) );
+ QList<quint16> Class2 ( Class2Data[C2] );
+
+ foreach ( quint16 FirstGlyph, Class1 )
+ {
+ foreach ( quint16 SecondGlyph, Class2 )
+ {
+ if ( Value1 )
+ pairs[FirstGlyph][SecondGlyph] = double ( Value1 );
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+// qDebug() <<"ValueFormat1 is null or both ValueFormat1 and ValueFormat2 are null";
+ }
+
+ }
+ else
+ qDebug() <<"unknown PosFormat"<<PosFormat;
+}
+
+KernFeature::ClassDefTable KernFeature::getClass ( quint16 classDefOffset, quint16 coverageId )
+{
+ ClassDefTable ret;
+ ret[0] = coverages[coverageId];
+ quint16 ClassFormat ( toUint16 ( classDefOffset ) );
+ if ( ClassFormat == 1 )
+ {
+ quint16 StartGlyph ( toUint16 ( classDefOffset +2 ) );
+ quint16 GlyphCount ( toUint16 ( classDefOffset +4 ) );
+ quint16 ClassValueArray ( classDefOffset + 6 );
+
+ for ( quint16 CV ( 0 );CV < GlyphCount; ++CV )
+ {
+ ret[0].removeAll ( StartGlyph + CV );
+ ret[ toUint16 ( ClassValueArray + ( CV * 2 ) ) ] << StartGlyph + CV;
+ }
+ }
+ else if ( ClassFormat == 2 )
+ {
+ quint16 ClassRangeCount ( toUint16 ( classDefOffset + 2 ) );
+ quint16 ClassRangeRecord ( classDefOffset + 4 );
+ for ( int CRR ( 0 ); CRR < ClassRangeCount; ++CRR )
+ {
+ quint16 Start ( toUint16 ( ClassRangeRecord + ( CRR * 6 ) ) );
+ quint16 End ( toUint16 ( ClassRangeRecord + ( CRR * 6 ) + 2 ) );
+ quint16 Class ( toUint16 ( ClassRangeRecord + ( CRR * 6 ) + 4 ) );
+
+ for ( quint16 gl ( Start ); gl <= End; ++gl )
+ {
+ ret[0].removeAll ( gl );
+ ret[Class] << gl;
+ }
+ }
+ }
+ else
+ qDebug() <<"Unknown Class Table type";
+
+ return ret;
+}
+
+quint16 KernFeature::toUint16 ( quint16 index )
+{
+ if ( ( index + 2 ) > GPOSTableRaw.count() )
+ {
+// qDebug() << "HORROR!" << index << GPOSTableRaw.count() << FontName ;
+ // Rather no kerning at all than random kerning
+// m_valid = false;
+ return 0;
+ }
+ // FIXME I just do not know how it has to be done *properly*
+ quint16 c1 ( GPOSTableRaw.at ( index ) );
+ quint16 c2 ( GPOSTableRaw.at ( index + 1 ) );
+ c1 &= 0xFF;
+ c2 &= 0xFF;
+ quint16 ret ( ( c1 << 8 ) | c2 );
+ return ret;
+}
+
+qint16 KernFeature::toInt16 ( quint16 index )
+{
+ if ( ( index + 2 ) > GPOSTableRaw.count() )
+ {
+ return 0;
+ }
+ // FIXME I just do not know how it has to be done *properly*
+ quint16 c1 ( GPOSTableRaw.at ( index ) );
+ quint16 c2 ( GPOSTableRaw.at ( index + 1 ) );
+ c1 &= 0xFF;
+ c2 &= 0xFF;
+ qint16 ret ( ( c1 << 8 ) | c2 );
+ return ret;
+}
+
+
namespace {
uint word(QByteArray const & bb, uint pos)
{
@@ -54,7 +412,47 @@
}
} //namespace
+ScFace_ttf::ScFace_ttf ( QString fam, QString sty, QString alt, QString scname, QString psname, QString path, int face )
+ : FtFace ( fam, sty, alt, scname, psname, path, face )
+{
+ formatCode = ScFace::SFNT;
+ kernFeature = 0;
+}
+ScFace_ttf::~ ScFace_ttf()
+{
+ if ( kernFeature )
+ delete kernFeature;
+}
+
+
+void ScFace_ttf::load() const
+{
+ if ( !kernFeature )
+ kernFeature = new KernFeature ( ftFace() );
+ FtFace::load();
+}
+
+void ScFace_ttf::unload() const
+{
+ if ( kernFeature )
+ delete kernFeature;
+ kernFeature = 0;
+ FtFace::unload();
+}
+
+qreal ScFace_ttf::glyphKerning ( uint gl1, uint gl2, qreal sz ) const
+{
+ if ( kernFeature->isValid() )
+ {
+ return kernFeature->getPairValue ( gl1,gl2 ) / m_uniEM * sz;
+
+ }
+ else
+ return FtFace::glyphKerning ( gl1, gl2, sz );
+}
+
+
void ScFace_ttf::RawData(QByteArray & bb) const {
if (formatCode == ScFace::TTCF) {
QByteArray coll;
Index: scribus/fonts/scface_ttf.h
===================================================================
--- scribus/fonts/scface_ttf.h (revision 16352)
+++ scribus/fonts/scface_ttf.h (working copy)
@@ -10,6 +10,70 @@
#include "scribusapi.h"
#include "fonts/ftface.h"
+
+#include FT_TRUETYPE_TABLES_H
+#include FT_TRUETYPE_TAGS_H
+
+
+/**
+ An object holding a table of kerning pairs extracted from
+ a kern feature such as found in a GPOS table
+ */
+class SCRIBUS_API KernFeature
+{
+ public:
+ /**
+ * Build a ready-to-use kerning pairs table
+ * @param face a valid FT_Face, It won’t be store by KernFeature
+ */
+ KernFeature ( FT_Face face );
+ KernFeature ( const KernFeature& kf );
+ ~KernFeature();
+
+ /**
+ * Get the kerning value for a pair of glyph indexes.
+ * @param glyph1 Index of the left glyph in logical order
+ * @param glyph2 Index of the right glyph in logical order
+ * @return the unscaled delta to apply to xadvance of the first glyph
+ */
+ double getPairValue ( unsigned int glyph1, unsigned int glyph2 ) const;
+
+ /**
+ * The table can have been invalidated if something went wrong at any moment.
+ * @return True if valid, False otherwise.
+ */
+ bool isValid() const {return m_valid;}
+
+ private:
+ bool m_valid;
+ QByteArray GPOSTableRaw;
+ QMap<quint16,QList<quint16> > coverages;
+ QMap<quint16, QMap<quint16, double> > pairs;
+
+ void makeCoverage();
+ void makePairs ( quint16 subtableOffset );
+
+ typedef QMap<quint16, QList<quint16> > ClassDefTable; // <Class , list<GLyph> >
+ ClassDefTable getClass ( quint16 classDefOffset, quint16 coverageId );
+ inline quint16 toUint16 ( quint16 index );
+ inline qint16 toInt16 ( quint16 index );
+
+ enum ValueFormat
+ {
+ XPlacement = 0x0001,
+ YPlacement = 0x0002,
+ XAdvance = 0x0004,
+ YAdvance = 0x0008,
+ XPlaDevice =0x0010,
+ YPlaDevice =0x0020,
+ XAdvDevice =0x0040,
+ YAdvDevice =0x0080
+ };
+ QString FontName;// for debugging purpose
+};
+
+
+
/*
Class ScFace_ttf
Subclass of ScFace, specifically for TrueType fonts.
@@ -19,13 +83,19 @@
class SCRIBUS_API ScFace_ttf : public FtFace
{
public:
- ScFace_ttf(QString fam, QString sty, QString alt, QString scname, QString psname, QString path, int face)
- : FtFace(fam, sty, alt, scname, psname, path, face )
- {
- formatCode = ScFace::SFNT;
- }
+ ScFace_ttf ( QString fam, QString sty, QString alt, QString scname, QString psname, QString path, int face );
+ ~ScFace_ttf();
+
+ void load () const;
+ void unload () const;
+
bool EmbedFont(QString &str) const;
void RawData(QByteArray & bb) const;
+
+ qreal glyphKerning ( uint gl1, uint gl2, qreal sz ) const;
+
+private:
+ mutable KernFeature * kernFeature;
};
#endif
Index: scribus/fonts/ftface.h
===================================================================
--- scribus/fonts/ftface.h (revision 16352)
+++ scribus/fonts/ftface.h (working copy)
@@ -81,7 +81,7 @@
uint char2CMap(QChar ch) const;
- qreal glyphKerning (uint gl1, uint gl2, qreal sz) const;
+ virtual qreal glyphKerning (uint gl1, uint gl2, qreal sz) const;
// GlyphMetrics glyphBBox (uint gl, qreal sz) const;
void RawData (QByteArray & bb) const;
