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iText, a free Java-PDF library
/*
* $Id: 590ea21f409d5b796a1b522a6c44039060f07bd2 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 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
*
* This program is distributed in the hope that it will be useful, but
* 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.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import com.itextpdf.text.DocWriter;
import com.itextpdf.text.Document;
import com.itextpdf.text.Rectangle;
/**
* PdfContents is a PdfStream containing the contents (text + graphics) of a PdfPage.
*/
class PdfContents extends PdfStream {
static final byte SAVESTATE[] = DocWriter.getISOBytes("q\n");
static final byte RESTORESTATE[] = DocWriter.getISOBytes("Q\n");
static final byte ROTATE90[] = DocWriter.getISOBytes("0 1 -1 0 ");
static final byte ROTATE180[] = DocWriter.getISOBytes("-1 0 0 -1 ");
static final byte ROTATE270[] = DocWriter.getISOBytes("0 -1 1 0 ");
static final byte ROTATEFINAL[] = DocWriter.getISOBytes(" cm\n");
// constructor
/**
* Constructs a PdfContents-object, containing text and general graphics.
*
* @param under the direct content that is under all others
* @param content the graphics in a page
* @param text the text in a page
* @param secondContent the direct content that is over all others
* @throws BadPdfFormatException on error
*/
PdfContents(PdfContentByte under, PdfContentByte content, PdfContentByte text, PdfContentByte secondContent, Rectangle page) throws BadPdfFormatException {
super();
try {
OutputStream out = null;
Deflater deflater = null;
streamBytes = new ByteArrayOutputStream();
if (Document.compress)
{
compressed = true;
if (text != null)
compressionLevel = text.getPdfWriter().getCompressionLevel();
else if (content != null)
compressionLevel = content.getPdfWriter().getCompressionLevel();
deflater = new Deflater(compressionLevel);
out = new DeflaterOutputStream(streamBytes, deflater);
}
else
out = streamBytes;
int rotation = page.getRotation();
switch (rotation) {
case 90:
out.write(ROTATE90);
out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop())));
out.write(' ');
out.write('0');
out.write(ROTATEFINAL);
break;
case 180:
out.write(ROTATE180);
out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight())));
out.write(' ');
out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop())));
out.write(ROTATEFINAL);
break;
case 270:
out.write(ROTATE270);
out.write('0');
out.write(' ');
out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight())));
out.write(ROTATEFINAL);
break;
}
if (under.size() > 0) {
out.write(SAVESTATE);
under.getInternalBuffer().writeTo(out);
out.write(RESTORESTATE);
}
if (content.size() > 0) {
out.write(SAVESTATE);
content.getInternalBuffer().writeTo(out);
out.write(RESTORESTATE);
}
if (text != null) {
out.write(SAVESTATE);
text.getInternalBuffer().writeTo(out);
out.write(RESTORESTATE);
}
if (secondContent.size() > 0) {
secondContent.getInternalBuffer().writeTo(out);
}
out.close();
if (deflater != null) {
deflater.end();
}
}
catch (Exception e) {
throw new BadPdfFormatException(e.getMessage());
}
put(PdfName.LENGTH, new PdfNumber(streamBytes.size()));
if (compressed)
put(PdfName.FILTER, PdfName.FLATEDECODE);
}
}