Package org.apache.fontbox.ttf.gsub

Class GlyphSubstitutionDataExtractor

java.lang.Object

org.apache.fontbox.ttf.gsub.GlyphSubstitutionDataExtractor

public class GlyphSubstitutionDataExtractor
extends Object

This class has utility methods to extract meaningful GsubData from the highly obfuscated GSUB Tables. This GsubData is then used to determine which combination of glyphs or words have to be replaced.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	GlyphSubstitutionDataExtractor.ScriptTableDetails

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor	Description
GlyphSubstitutionDataExtractor()

Method Summary

Modifier and Type	Method	Description
private MapBackedGsubData	buildMapBackedGsubData(FeatureListTable featureListTable, LookupListTable lookupListTable, GlyphSubstitutionDataExtractor.ScriptTableDetails scriptTableDetails)
private void	extractData(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTable lookupTable)
private void	extractDataFromAlternateSubstitutionSubstFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTypeAlternateSubstitutionFormat1 alternateSubstitutionFormat1)	Extracts data from the AlternateSubstitutionFormat1 (lookuptype) 3 table and puts it in the glyphSubstitutionMap.
private void	extractDataFromLigatureSubstitutionSubstFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTypeLigatureSubstitutionSubstFormat1 ligatureSubstitutionTable)
private void	extractDataFromLigatureTable(Map<List<Integer>,Integer> glyphSubstitutionMap, LigatureTable ligatureTable)
private void	extractDataFromMultipleSubstitutionFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTypeMultipleSubstitutionFormat1 multipleSubstFormat1Subtable)
private void	extractDataFromSingleSubstTableFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTypeSingleSubstFormat1 singleSubstTableFormat1)
private void	extractDataFromSingleSubstTableFormat2Table(Map<List<Integer>,Integer> glyphSubstitutionMap, LookupTypeSingleSubstFormat2 singleSubstTableFormat2)
GsubData	getGsubData(String scriptName, ScriptTable scriptTable, FeatureListTable featureListTable, LookupListTable lookupListTable)	Unlike getGsubData(Map, FeatureListTable, LookupListTable), this method doesn't iterate over supported Language's searching for the first match with the scripts of the font.
GsubData	getGsubData(Map<String,ScriptTable> scriptList, FeatureListTable featureListTable, LookupListTable lookupListTable)
private GlyphSubstitutionDataExtractor.ScriptTableDetails	getSupportedLanguage(Map<String,ScriptTable> scriptList)
private void	populateGsubData(Map<String,Map<List<Integer>,Integer>> gsubData, FeatureRecord featureRecord, LookupListTable lookupListTable)
private void	populateGsubData(Map<String,Map<List<Integer>,Integer>> gsubData, LangSysTable langSysTable, FeatureListTable featureListTable, LookupListTable lookupListTable)
private void	putNewSubstitutionEntry(Map<List<Integer>,Integer> glyphSubstitutionMap, int newGlyph, List<Integer> glyphsToBeSubstituted)

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.apache.commons.logging.Log LOG

Constructor Details

GlyphSubstitutionDataExtractor

public GlyphSubstitutionDataExtractor()

Method Details

getGsubData

public GsubData getGsubData(Map<String,ScriptTable> scriptList,
 FeatureListTable featureListTable,
 LookupListTable lookupListTable)

getGsubData

public GsubData getGsubData(String scriptName,
 ScriptTable scriptTable,
 FeatureListTable featureListTable,
 LookupListTable lookupListTable)

Unlike getGsubData(Map, FeatureListTable, LookupListTable), this method doesn't iterate over supported Language's searching for the first match with the scripts of the font. Instead, it unconditionally creates GlyphSubstitutionDataExtractor.ScriptTableDetails instance with language left unspecified.

Parameters:

scriptName -

scriptTable -

featureListTable -

lookupListTable -

Returns:

GsubData instance built especially for the given scriptName

buildMapBackedGsubData

private MapBackedGsubData buildMapBackedGsubData(FeatureListTable featureListTable,
 LookupListTable lookupListTable,
 GlyphSubstitutionDataExtractor.ScriptTableDetails scriptTableDetails)

getSupportedLanguage

private GlyphSubstitutionDataExtractor.ScriptTableDetails getSupportedLanguage(Map<String,ScriptTable> scriptList)

populateGsubData

private void populateGsubData(Map<String,Map<List<Integer>,Integer>> gsubData,
 LangSysTable langSysTable,
 FeatureListTable featureListTable,
 LookupListTable lookupListTable)

populateGsubData

private void populateGsubData(Map<String,Map<List<Integer>,Integer>> gsubData,
 FeatureRecord featureRecord,
 LookupListTable lookupListTable)

extractData

private void extractData(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTable lookupTable)

extractDataFromSingleSubstTableFormat1Table

private void extractDataFromSingleSubstTableFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTypeSingleSubstFormat1 singleSubstTableFormat1)

extractDataFromSingleSubstTableFormat2Table

private void extractDataFromSingleSubstTableFormat2Table(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTypeSingleSubstFormat2 singleSubstTableFormat2)

extractDataFromMultipleSubstitutionFormat1Table

private void extractDataFromMultipleSubstitutionFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTypeMultipleSubstitutionFormat1 multipleSubstFormat1Subtable)

extractDataFromLigatureSubstitutionSubstFormat1Table

private void extractDataFromLigatureSubstitutionSubstFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTypeLigatureSubstitutionSubstFormat1 ligatureSubstitutionTable)

extractDataFromAlternateSubstitutionSubstFormat1Table

private void extractDataFromAlternateSubstitutionSubstFormat1Table(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LookupTypeAlternateSubstitutionFormat1 alternateSubstitutionFormat1)

Extracts data from the AlternateSubstitutionFormat1 (lookuptype) 3 table and puts it in the glyphSubstitutionMap.

Parameters:

glyphSubstitutionMap - the map to store the substitution data

alternateSubstitutionFormat1 - the alternate substitution format 1 table

extractDataFromLigatureTable

private void extractDataFromLigatureTable(Map<List<Integer>,Integer> glyphSubstitutionMap,
 LigatureTable ligatureTable)

putNewSubstitutionEntry

private void putNewSubstitutionEntry(Map<List<Integer>,Integer> glyphSubstitutionMap,
 int newGlyph,
 List<Integer> glyphsToBeSubstituted)