Class GlyphSubstitutionTableReader

java.lang.Object

com.itextpdf.text.pdf.fonts.otf.OpenTypeFontTableReader

com.itextpdf.text.pdf.fonts.otf.GlyphSubstitutionTableReader

public class GlyphSubstitutionTableReader
extends OpenTypeFontTableReader

Parses an OpenTypeFont file and reads the Glyph Substitution Table. This table governs how two or more Glyphs should be merged to a single Glyph. This is especially useful for Asian languages like Bangla, Hindi, etc.

This has been written according to the OPenTypeFont specifications. This may be found here.

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<Integer, Character>	glyphToCharacterMap
private final int[]	glyphWidthsByIndex
private Map<Integer, List<Integer>>	rawLigatureSubstitutionMap

Fields inherited from class OpenTypeFontTableReader

LOG, rf, tableLocation

Constructor Summary

Constructors

Constructor	Description
GlyphSubstitutionTableReader(RandomAccessFileOrArray rf, int gsubTableLocation, Map<Integer, Character> glyphToCharacterMap, int[] glyphWidthsByIndex)

Method Summary

Modifier and Type	Method	Description
Map<String,Glyph>	getGlyphSubstitutionMap()
private String	getTextFromGlyph(int glyphId, Map<Integer, Character> glyphToCharacterMap)
void	read()
private void	readLigatureSetTable(int ligatureSetTableLocation, int coverageGlyphId)
private void	readLigatureSubstitutionSubtable(int ligatureSubstitutionSubtableLocation)	LookupType 4: Ligature Substitution Subtable
private void	readLigatureTable(int ligatureTableLocation, int coverageGlyphId)
private void	readSingleSubstitutionSubtable(int subTableLocation)	LookupType 1: Single Substitution Subtable
protected void	readSubTable(int lookupType, int subTableLocation)

Methods inherited from class OpenTypeFontTableReader

getSupportedLanguage, readCoverageFormat, startReadingTable

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

glyphWidthsByIndex

private final int[] glyphWidthsByIndex

glyphToCharacterMap

private final Map<Integer, Character> glyphToCharacterMap

rawLigatureSubstitutionMap

private Map<Integer, List<Integer>> rawLigatureSubstitutionMap

Constructor Details

GlyphSubstitutionTableReader

public GlyphSubstitutionTableReader(RandomAccessFileOrArray rf,
 int gsubTableLocation,
 Map<Integer, Character> glyphToCharacterMap,
 int[] glyphWidthsByIndex)
                             throws IOException

Throws:

IOException

Method Details

read

public void read()
          throws FontReadingException

Throws:

FontReadingException

getGlyphSubstitutionMap

public Map<String,Glyph> getGlyphSubstitutionMap()
                                          throws FontReadingException

Throws:

FontReadingException

getTextFromGlyph

private String getTextFromGlyph(int glyphId,
 Map<Integer, Character> glyphToCharacterMap)
                         throws FontReadingException

Throws:

FontReadingException

readSubTable

protected void readSubTable(int lookupType,
 int subTableLocation)
                     throws IOException

Specified by:

readSubTable in class OpenTypeFontTableReader

Throws:

IOException

readSingleSubstitutionSubtable

private void readSingleSubstitutionSubtable(int subTableLocation)
                                     throws IOException

LookupType 1: Single Substitution Subtable

Throws:

IOException

readLigatureSubstitutionSubtable

private void readLigatureSubstitutionSubtable(int ligatureSubstitutionSubtableLocation)
                                       throws IOException

LookupType 4: Ligature Substitution Subtable

Throws:

IOException

readLigatureSetTable

private void readLigatureSetTable(int ligatureSetTableLocation,
 int coverageGlyphId)
                           throws IOException

Throws:

IOException

readLigatureTable

private void readLigatureTable(int ligatureTableLocation,
 int coverageGlyphId)
                        throws IOException

Throws:

IOException