001/*
002 * $Id: PdfFunction.java 4784 2011-03-15 08:33:00Z blowagie $
003 *
004 * This file is part of the iText (R) project.
005 * Copyright (c) 1998-2011 1T3XT BVBA
006 * Authors: Bruno Lowagie, Paulo Soares, et al.
007 *
008 * This program is free software; you can redistribute it and/or modify
009 * it under the terms of the GNU Affero General Public License version 3
010 * as published by the Free Software Foundation with the addition of the
011 * following permission added to Section 15 as permitted in Section 7(a):
012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
014 *
015 * This program is distributed in the hope that it will be useful, but
016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
017 * or FITNESS FOR A PARTICULAR PURPOSE.
018 * See the GNU Affero General Public License for more details.
019 * You should have received a copy of the GNU Affero General Public License
020 * along with this program; if not, see http://www.gnu.org/licenses or write to
021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
022 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
023 * http://itextpdf.com/terms-of-use/
024 *
025 * The interactive user interfaces in modified source and object code versions
026 * of this program must display Appropriate Legal Notices, as required under
027 * Section 5 of the GNU Affero General Public License.
028 *
029 * In accordance with Section 7(b) of the GNU Affero General Public License,
030 * a covered work must retain the producer line in every PDF that is created
031 * or manipulated using iText.
032 *
033 * You can be released from the requirements of the license by purchasing
034 * a commercial license. Buying such a license is mandatory as soon as you
035 * develop commercial activities involving the iText software without
036 * disclosing the source code of your own applications.
037 * These activities include: offering paid services to customers as an ASP,
038 * serving PDFs on the fly in a web application, shipping iText with a closed
039 * source product.
040 *
041 * For more information, please contact iText Software Corp. at this
042 * address: sales@itextpdf.com
043 */
044package com.itextpdf.text.pdf;
045
046import java.io.IOException;
047
048import com.itextpdf.text.ExceptionConverter;
049/** Implements PDF functions.
050 *
051 * @author Paulo Soares
052 */
053public class PdfFunction {
054    
055    protected PdfWriter writer;
056    
057    protected PdfIndirectReference reference;
058    
059    protected PdfDictionary dictionary;
060    
061    /** Creates new PdfFunction */
062    protected PdfFunction(PdfWriter writer) {
063        this.writer = writer;
064    }
065    
066    PdfIndirectReference getReference() {
067        try {
068            if (reference == null) {
069                reference = writer.addToBody(dictionary).getIndirectReference();
070            }
071        }
072        catch (IOException ioe) {
073            throw new ExceptionConverter(ioe);
074        }
075        return reference;
076    }
077        
078    public static PdfFunction type0(PdfWriter writer, float domain[], float range[], int size[],
079        int bitsPerSample, int order, float encode[], float decode[], byte stream[]) {
080        PdfFunction func = new PdfFunction(writer);
081        func.dictionary = new PdfStream(stream);
082        ((PdfStream)func.dictionary).flateCompress(writer.getCompressionLevel());
083        func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(0));
084        func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain));
085        func.dictionary.put(PdfName.RANGE, new PdfArray(range));
086        func.dictionary.put(PdfName.SIZE, new PdfArray(size));
087        func.dictionary.put(PdfName.BITSPERSAMPLE, new PdfNumber(bitsPerSample));
088        if (order != 1)
089            func.dictionary.put(PdfName.ORDER, new PdfNumber(order));
090        if (encode != null)
091            func.dictionary.put(PdfName.ENCODE, new PdfArray(encode));
092        if (decode != null)
093            func.dictionary.put(PdfName.DECODE, new PdfArray(decode));
094        return func;
095    }
096
097    public static PdfFunction type2(PdfWriter writer, float domain[], float range[], float c0[], float c1[], float n) {
098        PdfFunction func = new PdfFunction(writer);
099        func.dictionary = new PdfDictionary();
100        func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(2));
101        func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain));
102        if (range != null)
103            func.dictionary.put(PdfName.RANGE, new PdfArray(range));
104        if (c0 != null)
105            func.dictionary.put(PdfName.C0, new PdfArray(c0));
106        if (c1 != null)
107            func.dictionary.put(PdfName.C1, new PdfArray(c1));
108        func.dictionary.put(PdfName.N, new PdfNumber(n));
109        return func;
110    }
111
112    public static PdfFunction type3(PdfWriter writer, float domain[], float range[], PdfFunction functions[], float bounds[], float encode[]) {
113        PdfFunction func = new PdfFunction(writer);
114        func.dictionary = new PdfDictionary();
115        func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(3));
116        func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain));
117        if (range != null)
118            func.dictionary.put(PdfName.RANGE, new PdfArray(range));
119        PdfArray array = new PdfArray();
120        for (int k = 0; k < functions.length; ++k)
121            array.add(functions[k].getReference());
122        func.dictionary.put(PdfName.FUNCTIONS, array);
123        func.dictionary.put(PdfName.BOUNDS, new PdfArray(bounds));
124        func.dictionary.put(PdfName.ENCODE, new PdfArray(encode));
125        return func;
126    }
127    
128    public static PdfFunction type4(PdfWriter writer, float domain[], float range[], String postscript) {
129        byte b[] = new byte[postscript.length()];
130        for (int k = 0; k < b.length; ++k)
131            b[k] = (byte)postscript.charAt(k);
132        PdfFunction func = new PdfFunction(writer);
133        func.dictionary = new PdfStream(b);
134        ((PdfStream)func.dictionary).flateCompress(writer.getCompressionLevel());
135        func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(4));
136        func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain));
137        func.dictionary.put(PdfName.RANGE, new PdfArray(range));
138        return func;
139    }
140}