Package com.itextpdf.text.pdf.fonts.otf

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 java.util.Map<java.lang.Integer,java.lang.Character>	glyphToCharacterMap
private int[]	glyphWidthsByIndex
private java.util.Map<java.lang.Integer,java.util.List<java.lang.Integer>>	rawLigatureSubstitutionMap

Fields inherited from class com.itextpdf.text.pdf.fonts.otf.OpenTypeFontTableReader

LOG, rf, tableLocation

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
java.util.Map<java.lang.String,Glyph>	getGlyphSubstitutionMap()
private java.lang.String	getTextFromGlyph(int glyphId, java.util.Map<java.lang.Integer,java.lang.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 com.itextpdf.text.pdf.fonts.otf.OpenTypeFontTableReader

getSupportedLanguage, readCoverageFormat, startReadingTable

Methods inherited from class java.lang.Object

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

Field Detail

glyphWidthsByIndex

private final int[] glyphWidthsByIndex

glyphToCharacterMap

private final java.util.Map<java.lang.Integer,java.lang.Character> glyphToCharacterMap

rawLigatureSubstitutionMap

private java.util.Map<java.lang.Integer,java.util.List<java.lang.Integer>> rawLigatureSubstitutionMap

Constructor Detail

GlyphSubstitutionTableReader

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

Throws:

java.io.IOException

Method Detail

read

public void read()
          throws FontReadingException

Throws:

FontReadingException

getGlyphSubstitutionMap

public java.util.Map<java.lang.String,Glyph> getGlyphSubstitutionMap()
                                                                    throws FontReadingException

Throws:

FontReadingException

getTextFromGlyph

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

Throws:

FontReadingException

readSubTable

protected void readSubTable(int lookupType,
                            int subTableLocation)
                     throws java.io.IOException

Specified by:

readSubTable in class OpenTypeFontTableReader

Throws:

java.io.IOException

readSingleSubstitutionSubtable

private void readSingleSubstitutionSubtable(int subTableLocation)
                                     throws java.io.IOException

LookupType 1: Single Substitution Subtable

Throws:

java.io.IOException

readLigatureSubstitutionSubtable

private void readLigatureSubstitutionSubtable(int ligatureSubstitutionSubtableLocation)
                                       throws java.io.IOException

LookupType 4: Ligature Substitution Subtable

Throws:

java.io.IOException

readLigatureSetTable

private void readLigatureSetTable(int ligatureSetTableLocation,
                                  int coverageGlyphId)
                           throws java.io.IOException

Throws:

java.io.IOException

readLigatureTable

private void readLigatureTable(int ligatureTableLocation,
                               int coverageGlyphId)
                        throws java.io.IOException

Throws:

java.io.IOException