Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 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: sales@itextpdf.com */ package com.itextpdf.text.pdf; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import com.itextpdf.text.error_messages.MessageLocalization; import com.itextpdf.text.Image; /** * <CODE>PdfImage</CODE> is a <CODE>PdfStream</CODE> containing an image-<CODE>Dictionary</CODE> and -stream. */ public class PdfImage extends PdfStream { static final int TRANSFERSIZE = 4096; // membervariables /** This is the <CODE>PdfName</CODE> of the image. */ protected PdfName name = null; protected Image image = null; // constructor /** * Constructs a <CODE>PdfImage</CODE>-object. * * @param image the <CODE>Image</CODE>-object * @param name the <CODE>PdfName</CODE> for this image * @throws BadPdfFormatException on error */ public PdfImage(Image image, String name, PdfIndirectReference maskRef) throws BadPdfFormatException { super(); this.image = image; if (name == null) generateImgResName(image); else this.name = new PdfName(name); put(PdfName.TYPE, PdfName.XOBJECT); put(PdfName.SUBTYPE, PdfName.IMAGE); put(PdfName.WIDTH, new PdfNumber(image.getWidth())); put(PdfName.HEIGHT, new PdfNumber(image.getHeight())); if (image.getLayer() != null) put(PdfName.OC, image.getLayer().getRef()); if (image.isMask() && (image.getBpc() == 1 || image.getBpc() > 0xff)) put(PdfName.IMAGEMASK, PdfBoolean.PDFTRUE); if (maskRef != null) { if (image.isSmask()) put(PdfName.SMASK, maskRef); else put(PdfName.MASK, maskRef); } if (image.isMask() && image.isInverted()) put(PdfName.DECODE, new PdfLiteral("[1 0]")); if (image.isInterpolation()) put(PdfName.INTERPOLATE, PdfBoolean.PDFTRUE); InputStream is = null; try { // deal with transparency int transparency[] = image.getTransparency(); if (transparency != null && !image.isMask() && maskRef == null) { StringBuilder s = new StringBuilder("["); for (int k = 0; k < transparency.length; ++k) s.append(transparency[k]).append(" "); s.append("]"); put(PdfName.MASK, new PdfLiteral(s.toString())); } // Raw Image data if (image.isImgRaw()) { // will also have the CCITT parameters int colorspace = image.getColorspace(); bytes = image.getRawData(); put(PdfName.LENGTH, new PdfNumber(bytes.length)); int bpc = image.getBpc(); if (bpc > 0xff) { if (!image.isMask()) put(PdfName.COLORSPACE, PdfName.DEVICEGRAY); put(PdfName.BITSPERCOMPONENT, new PdfNumber(1)); put(PdfName.FILTER, PdfName.CCITTFAXDECODE); int k = bpc - Image.CCITTG3_1D; PdfDictionary decodeparms = new PdfDictionary(); if (k != 0) decodeparms.put(PdfName.K, new PdfNumber(k)); if ((colorspace & Image.CCITT_BLACKIS1) != 0) decodeparms.put(PdfName.BLACKIS1, PdfBoolean.PDFTRUE); if ((colorspace & Image.CCITT_ENCODEDBYTEALIGN) != 0) decodeparms.put(PdfName.ENCODEDBYTEALIGN, PdfBoolean.PDFTRUE); if ((colorspace & Image.CCITT_ENDOFLINE) != 0) decodeparms.put(PdfName.ENDOFLINE, PdfBoolean.PDFTRUE); if ((colorspace & Image.CCITT_ENDOFBLOCK) != 0) decodeparms.put(PdfName.ENDOFBLOCK, PdfBoolean.PDFFALSE); decodeparms.put(PdfName.COLUMNS, new PdfNumber(image.getWidth())); decodeparms.put(PdfName.ROWS, new PdfNumber(image.getHeight())); put(PdfName.DECODEPARMS, decodeparms); } else { switch (colorspace) { case 1: put(PdfName.COLORSPACE, PdfName.DEVICEGRAY); if (image.isInverted()) put(PdfName.DECODE, new PdfLiteral("[1 0]")); break; case 3: put(PdfName.COLORSPACE, PdfName.DEVICERGB); if (image.isInverted()) put(PdfName.DECODE, new PdfLiteral("[1 0 1 0 1 0]")); break; case 4: default: put(PdfName.COLORSPACE, PdfName.DEVICECMYK); if (image.isInverted()) put(PdfName.DECODE, new PdfLiteral("[1 0 1 0 1 0 1 0]")); } PdfDictionary additional = image.getAdditional(); if (additional != null) putAll(additional); if (image.isMask() && (image.getBpc() == 1 || image.getBpc() > 8)) remove(PdfName.COLORSPACE); put(PdfName.BITSPERCOMPONENT, new PdfNumber(image.getBpc())); if (image.isDeflated()) put(PdfName.FILTER, PdfName.FLATEDECODE); else { flateCompress(image.getCompressionLevel()); } } return; } // GIF, JPEG or PNG String errorID; if (image.getRawData() == null) { is = image.getUrl().openStream(); errorID = image.getUrl().toString(); } else { is = new java.io.ByteArrayInputStream(image.getRawData()); errorID = "Byte array"; } switch (image.type()) { case Image.JPEG: put(PdfName.FILTER, PdfName.DCTDECODE); if (image.getColorTransform() == 0) { PdfDictionary decodeparms = new PdfDictionary(); decodeparms.put(PdfName.COLORTRANSFORM, new PdfNumber(0)); put(PdfName.DECODEPARMS, decodeparms); } switch (image.getColorspace()) { case 1: put(PdfName.COLORSPACE, PdfName.DEVICEGRAY); break; case 3: put(PdfName.COLORSPACE, PdfName.DEVICERGB); break; default: put(PdfName.COLORSPACE, PdfName.DEVICECMYK); if (image.isInverted()) { put(PdfName.DECODE, new PdfLiteral("[1 0 1 0 1 0 1 0]")); } } put(PdfName.BITSPERCOMPONENT, new PdfNumber(8)); if (image.getRawData() != null) { bytes = image.getRawData(); put(PdfName.LENGTH, new PdfNumber(bytes.length)); return; } streamBytes = new ByteArrayOutputStream(); transferBytes(is, streamBytes, -1); break; case Image.JPEG2000: put(PdfName.FILTER, PdfName.JPXDECODE); if (image.getColorspace() > 0) { switch (image.getColorspace()) { case 1: put(PdfName.COLORSPACE, PdfName.DEVICEGRAY); break; case 3: put(PdfName.COLORSPACE, PdfName.DEVICERGB); break; default: put(PdfName.COLORSPACE, PdfName.DEVICECMYK); } put(PdfName.BITSPERCOMPONENT, new PdfNumber(image.getBpc())); } if (image.getRawData() != null) { bytes = image.getRawData(); put(PdfName.LENGTH, new PdfNumber(bytes.length)); return; } streamBytes = new ByteArrayOutputStream(); transferBytes(is, streamBytes, -1); break; case Image.JBIG2: put(PdfName.FILTER, PdfName.JBIG2DECODE); put(PdfName.COLORSPACE, PdfName.DEVICEGRAY); put(PdfName.BITSPERCOMPONENT, new PdfNumber(1)); if (image.getRawData() != null) { bytes = image.getRawData(); put(PdfName.LENGTH, new PdfNumber(bytes.length)); return; } streamBytes = new ByteArrayOutputStream(); transferBytes(is, streamBytes, -1); break; default: throw new BadPdfFormatException( MessageLocalization.getComposedMessage("1.is.an.unknown.image.format", errorID)); } if (image.getCompressionLevel() > NO_COMPRESSION) flateCompress(image.getCompressionLevel()); put(PdfName.LENGTH, new PdfNumber(streamBytes.size())); } catch (IOException ioe) { throw new BadPdfFormatException(ioe.getMessage()); } finally { if (is != null) { try { is.close(); } catch (Exception ee) { // empty on purpose } } } } /** * Returns the <CODE>PdfName</CODE> of the image. * * @return the name */ public PdfName name() { return name; } public Image getImage() { return image; } static void transferBytes(InputStream in, OutputStream out, int len) throws IOException { byte buffer[] = new byte[TRANSFERSIZE]; if (len < 0) len = 0x7fff0000; int size; while (len != 0) { size = in.read(buffer, 0, Math.min(len, TRANSFERSIZE)); if (size < 0) return; out.write(buffer, 0, size); len -= size; } } protected void importAll(PdfImage dup) { name = dup.name; compressed = dup.compressed; compressionLevel = dup.compressionLevel; streamBytes = dup.streamBytes; bytes = dup.bytes; hashMap = dup.hashMap; } /** * Called when no resource name is provided in our constructor. This generates a * name that is required to be unique within a given resource dictionary. * @since 5.0.1 */ private void generateImgResName(Image img) { name = new PdfName("img" + Long.toHexString(img.getMySerialId())); } }