001/* 002 * $Id: PdfContents.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.ByteArrayOutputStream; 047import java.io.OutputStream; 048import java.util.zip.Deflater; 049import java.util.zip.DeflaterOutputStream; 050 051import com.itextpdf.text.DocWriter; 052import com.itextpdf.text.Document; 053import com.itextpdf.text.Rectangle; 054 055/** 056 * <CODE>PdfContents</CODE> is a <CODE>PdfStream</CODE> containing the contents (text + graphics) of a <CODE>PdfPage</CODE>. 057 */ 058 059class PdfContents extends PdfStream { 060 061 static final byte SAVESTATE[] = DocWriter.getISOBytes("q\n"); 062 static final byte RESTORESTATE[] = DocWriter.getISOBytes("Q\n"); 063 static final byte ROTATE90[] = DocWriter.getISOBytes("0 1 -1 0 "); 064 static final byte ROTATE180[] = DocWriter.getISOBytes("-1 0 0 -1 "); 065 static final byte ROTATE270[] = DocWriter.getISOBytes("0 -1 1 0 "); 066 static final byte ROTATEFINAL[] = DocWriter.getISOBytes(" cm\n"); 067 // constructor 068 069/** 070 * Constructs a <CODE>PdfContents</CODE>-object, containing text and general graphics. 071 * 072 * @param under the direct content that is under all others 073 * @param content the graphics in a page 074 * @param text the text in a page 075 * @param secondContent the direct content that is over all others 076 * @throws BadPdfFormatException on error 077 */ 078 079 PdfContents(PdfContentByte under, PdfContentByte content, PdfContentByte text, PdfContentByte secondContent, Rectangle page) throws BadPdfFormatException { 080 super(); 081 try { 082 OutputStream out = null; 083 Deflater deflater = null; 084 streamBytes = new ByteArrayOutputStream(); 085 if (Document.compress) 086 { 087 compressed = true; 088 compressionLevel = text.getPdfWriter().getCompressionLevel(); 089 deflater = new Deflater(compressionLevel); 090 out = new DeflaterOutputStream(streamBytes, deflater); 091 } 092 else 093 out = streamBytes; 094 int rotation = page.getRotation(); 095 switch (rotation) { 096 case 90: 097 out.write(ROTATE90); 098 out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop()))); 099 out.write(' '); 100 out.write('0'); 101 out.write(ROTATEFINAL); 102 break; 103 case 180: 104 out.write(ROTATE180); 105 out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight()))); 106 out.write(' '); 107 out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop()))); 108 out.write(ROTATEFINAL); 109 break; 110 case 270: 111 out.write(ROTATE270); 112 out.write('0'); 113 out.write(' '); 114 out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight()))); 115 out.write(ROTATEFINAL); 116 break; 117 } 118 if (under.size() > 0) { 119 out.write(SAVESTATE); 120 under.getInternalBuffer().writeTo(out); 121 out.write(RESTORESTATE); 122 } 123 if (content.size() > 0) { 124 out.write(SAVESTATE); 125 content.getInternalBuffer().writeTo(out); 126 out.write(RESTORESTATE); 127 } 128 if (text != null) { 129 out.write(SAVESTATE); 130 text.getInternalBuffer().writeTo(out); 131 out.write(RESTORESTATE); 132 } 133 if (secondContent.size() > 0) { 134 secondContent.getInternalBuffer().writeTo(out); 135 } 136 out.close(); 137 if (deflater != null) { 138 deflater.end(); 139 } 140 } 141 catch (Exception e) { 142 throw new BadPdfFormatException(e.getMessage()); 143 } 144 put(PdfName.LENGTH, new PdfNumber(streamBytes.size())); 145 if (compressed) 146 put(PdfName.FILTER, PdfName.FLATEDECODE); 147 } 148}