com.itextpdf.io.font.otf.GlyphSubstitutionTableReader Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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*/
package com.itextpdf.io.font.otf;
import com.itextpdf.io.source.RandomAccessFileOrArray;
import java.util.Map;
/**
* 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.
*
* @author Palash Ray
*/
public class GlyphSubstitutionTableReader extends OpenTypeFontTableReader {
public GlyphSubstitutionTableReader(RandomAccessFileOrArray rf, int gsubTableLocation, OpenTypeGdefTableReader gdef,
Map indexGlyphMap, int unitsPerEm) throws java.io.IOException {
super(rf, gsubTableLocation, gdef, indexGlyphMap, unitsPerEm);
startReadingTable();
}
@Override
protected OpenTableLookup readLookupTable(int lookupType, int lookupFlag, int[] subTableLocations) throws java.io.IOException {
if (lookupType == 7) {
for (int k = 0; k < subTableLocations.length; ++k) {
int location = subTableLocations[k];
rf.seek(location);
rf.readUnsignedShort();
lookupType = rf.readUnsignedShort();
location += rf.readInt();
subTableLocations[k] = location;
}
}
switch (lookupType) {
case 1:
return new GsubLookupType1(this, lookupFlag, subTableLocations);
case 2:
return new GsubLookupType2(this, lookupFlag, subTableLocations);
case 3:
return new GsubLookupType3(this, lookupFlag, subTableLocations);
case 4:
return new GsubLookupType4(this, lookupFlag, subTableLocations);
case 5:
return new GsubLookupType5(this, lookupFlag, subTableLocations);
case 6:
return new GsubLookupType6(this, lookupFlag, subTableLocations);
default:
return null;
}
}
}