/*
Copyright 2009-2010 Stefano Chizzolini. http://www.pdfclown.org
Contributors:
* Stefano Chizzolini (original code developer, http://www.stefanochizzolini.it)
This file should be part of the source code distribution of "PDF Clown library"
(the Program): see the accompanying README files for more info.
This Program is free software; you can redistribute it and/or modify it under the terms
of the GNU Lesser General Public License as published by the Free Software Foundation;
either version 3 of the License, or (at your option) any later version.
This Program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY,
either expressed or implied; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the License for more details.
You should have received a copy of the GNU Lesser General Public License along with this
Program (see README files); if not, go to the GNU website (http://www.gnu.org/licenses/).
Redistribution and use, with or without modification, are permitted provided that such
redistributions retain the above copyright notice, license and disclaimer, along with
this list of conditions.
*/
package org.pdfclown.documents.contents.fonts;
import java.util.Hashtable;
import java.util.Map;
import org.pdfclown.PDF;
import org.pdfclown.VersionEnum;
import org.pdfclown.documents.Document;
import org.pdfclown.objects.PdfArray;
import org.pdfclown.objects.PdfDictionary;
import org.pdfclown.objects.PdfDirectObject;
import org.pdfclown.objects.PdfInteger;
import org.pdfclown.objects.PdfName;
import org.pdfclown.objects.PdfNumber;
import org.pdfclown.util.ByteArray;
/**
Simple font [PDF:1.6:5.5].
@author Stefano Chizzolini (http://www.stefanochizzolini.it)
@since 0.0.8
@version 0.1.0
*/
@PDF(VersionEnum.PDF10)
public abstract class SimpleFont
extends Font
{
// <constructors>
protected SimpleFont(
Document context
)
{super(context);}
protected SimpleFont(
PdfDirectObject baseObject
)
{super(baseObject);}
// </constructors>
@Override
protected PdfDictionary getDescriptor(
)
{return (PdfDictionary)getBaseDataObject().resolve(PdfName.FontDescriptor);}
protected abstract void loadEncoding();
/**
Loads the encoding differences into the given collection.
@param encodingDictionary Encoding dictionary.
@param codes Encoding to alter applying differences.
*/
protected void loadEncodingDifferences(
PdfDictionary encodingDictionary,
Map<ByteArray,Integer> codes
)
{
PdfArray differenceObjects = (PdfArray)encodingDictionary.resolve(PdfName.Differences);
if(differenceObjects == null)
return;
/*
NOTE: Each code is the first index in a sequence of character codes to be changed.
The first character name after the code becomes the name corresponding to that code.
Subsequent names replace consecutive code indices until the next code appears
in the array or the array ends.
*/
byte[] charCodeData = new byte[1];
for(PdfDirectObject differenceObject : differenceObjects)
{
if(differenceObject instanceof PdfInteger)
{charCodeData[0] = (byte)((((PdfInteger)differenceObject).getValue().intValue()) & 0xFF);} //TODO:verify whether it can be directly cast to byte (.byteValue())!
else // NOTE: MUST be PdfName.
{
ByteArray charCode = new ByteArray(charCodeData);
String charName = (String)((PdfName)differenceObject).getValue();
if(charName.equals(".notdef"))
{codes.remove(charCode);}
else
{
try
{codes.put(charCode,GlyphMapping.nameToCode(charName));}
catch (Exception e)
{codes.put(charCode,(int)charCodeData[0]);} // NOTE: This is an extreme remedy to non-standard character name lookups.
}
charCodeData[0]++;
}
}
}
@Override
protected void onLoad(
)
{
loadEncoding();
// Glyph widths.
if(glyphWidths == null)
{
glyphWidths = new Hashtable<Integer,Integer>();
PdfArray glyphWidthObjects = (PdfArray)getBaseDataObject().resolve(PdfName.Widths);
if(glyphWidthObjects != null)
{
ByteArray charCode = new ByteArray(
new byte[]
{(byte)(int)((PdfInteger)getBaseDataObject().get(PdfName.FirstChar)).getRawValue()}
);
for(PdfDirectObject glyphWidthObject : glyphWidthObjects)
{
int glyphWidth = ((PdfInteger)glyphWidthObject).getRawValue();
if(glyphWidth > 0)
{
Integer code = codes.get(charCode);
if(code != null)
{
glyphWidths.put(
glyphIndexes.get(code),
glyphWidth
);
}
}
charCode.data[0]++;
}
}
}
// Default glyph width.
{
PdfDictionary descriptor = getDescriptor();
if(descriptor != null)
{
PdfNumber<?> defaultGlyphWidthObject = (PdfNumber<?>)descriptor.get(PdfName.MissingWidth);
defaultGlyphWidth = (defaultGlyphWidthObject == null ? 0 : (int)Math.round(defaultGlyphWidthObject.getNumberValue()));
}
}
}
}