bmpimage.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * Copyright 2003 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 *
 *
 * The original JAI codecs have the following license
 *
 * Copyright (c) 2001 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduct the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed,licensed or intended for use in
 * the design, construction, operation or maintenance of any nuclear facility.
 */
package com.lowagie.text.pdf.codec;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;

import com.lowagie.text.BadElementException;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Image;
import com.lowagie.text.ImgRaw;
import com.lowagie.text.Utilities;
import com.lowagie.text.pdf.PdfArray;
import com.lowagie.text.pdf.PdfDictionary;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfNumber;
import com.lowagie.text.pdf.PdfString;

/** Reads a BMP image. All types of BMP can be read.
 * <p>
 * It is based in the JAI codec.
 *
 * @author  Paulo Soares ([e-mail])
 */
public class BmpImage {
    
    // BMP variables
    private InputStream inputStream;
    private long bitmapFileSize;
    private long bitmapOffset;
    private long compression;
    private long imageSize;
    private byte palette[];
    private int imageType;
    private int numBands;
    private boolean isBottomUp;
    private int bitsPerPixel;
    private int redMask, greenMask, blueMask, alphaMask;
    public HashMap properties = new HashMap();    
    private long xPelsPerMeter;
    private long yPelsPerMeter;
    // BMP Image types
    private static final int VERSION_2_1_BIT = 0;
    private static final int VERSION_2_4_BIT = 1;
    private static final int VERSION_2_8_BIT = 2;
    private static final int VERSION_2_24_BIT = 3;
    
    private static final int VERSION_3_1_BIT = 4;
    private static final int VERSION_3_4_BIT = 5;
    private static final int VERSION_3_8_BIT = 6;
    private static final int VERSION_3_24_BIT = 7;
    
    private static final int VERSION_3_NT_16_BIT = 8;
    private static final int VERSION_3_NT_32_BIT = 9;
    
    private static final int VERSION_4_1_BIT = 10;
    private static final int VERSION_4_4_BIT = 11;
    private static final int VERSION_4_8_BIT = 12;
    private static final int VERSION_4_16_BIT = 13;
    private static final int VERSION_4_24_BIT = 14;
    private static final int VERSION_4_32_BIT = 15;
    
    // Color space types
    private static final int LCS_CALIBRATED_RGB = 0;
    private static final int LCS_sRGB = 1;
    private static final int LCS_CMYK = 2;
    
    // Compression Types
    private static final int BI_RGB = 0;
    private static final int BI_RLE8 = 1;
    private static final int BI_RLE4 = 2;
    private static final int BI_BITFIELDS = 3;
    
    int width;
    int height;
    
    BmpImage(InputStream is, boolean noHeader, int size) throws IOException {
        bitmapFileSize = size;
        bitmapOffset = 0;
        process(is, noHeader);
    }
    
    /** Reads a BMP from an url.
     * @param url the url
     * @throws IOException on error
     * @return the image
     */    
    public static Image getImage(URL url) throws IOException {
        InputStream is = null;
        try {
            is = url.openStream();
            Image img = getImage(is);
            img.setUrl(url);
            return img;
        }
        finally {
            if (is != null) {
                is.close();
            }
        }
    }
    
    /** Reads a BMP from a stream. The stream is not closed.
     * @param is the stream
     * @throws IOException on error
     * @return the image
     */    
    public static Image getImage(InputStream is) throws IOException {
        return getImage(is, false, 0);
    }
    
    /** Reads a BMP from a stream. The stream is not closed.
     * The BMP may not have a header and be considered as a plain DIB.
     * @param is the stream
     * @param noHeader true to process a plain DIB
     * @param size the size of the DIB. Not used for a BMP
     * @throws IOException on error
     * @return the image
     */    
    public static Image getImage(InputStream is, boolean noHeader, int size) throws IOException {
        BmpImage bmp = new BmpImage(is, noHeader, size);
        try {
            Image img = bmp.getImage();
            img.setDpi((int)((double)bmp.xPelsPerMeter * 0.0254), (int)((double)bmp.yPelsPerMeter * 0.0254));
            img.setOriginalType(Image.ORIGINAL_BMP);
            return img;
        }
        catch (BadElementException be) {
            throw new ExceptionConverter(be);
        }
    }
    
    /** Reads a BMP from a file.
     * @param file the file
     * @throws IOException on error
     * @return the image
     */    
    public static Image getImage(String file) throws IOException {
        return getImage(Utilities.toURL(file));
    }
    
    /** Reads a BMP from a byte array.
     * @param data the byte array
     * @throws IOException on error
     * @return the image
     */    
    public static Image getImage(byte data[]) throws IOException {
        ByteArrayInputStream is = new ByteArrayInputStream(data);
        Image img = getImage(is);
        img.setOriginalData(data);
        return img;
    }

    
    protected void process(InputStream stream, boolean noHeader) throws IOException {
        if (noHeader || stream instanceof BufferedInputStream) {
            inputStream = stream;
        } else {
            inputStream = new BufferedInputStream(stream);
        }
        if (!noHeader) {
            // Start File Header
            if (!(readUnsignedByte(inputStream) == 'B' &&
            readUnsignedByte(inputStream) == 'M')) {
                throw new
                RuntimeException("Invalid magic value for BMP file.");
            }

            // Read file size
            bitmapFileSize = readDWord(inputStream);

            // Read the two reserved fields
            readWord(inputStream);
            readWord(inputStream);

            // Offset to the bitmap from the beginning
            bitmapOffset = readDWord(inputStream);

            // End File Header
        }
        // Start BitmapCoreHeader
        long size = readDWord(inputStream);
        
        if (size == 12) {
            width = readWord(inputStream);
            height = readWord(inputStream);
        } else {
            width = readLong(inputStream);
            height = readLong(inputStream);
        }
        
        int planes = readWord(inputStream);
        bitsPerPixel = readWord(inputStream);
        
        properties.put("color_planes", new Integer(planes));
        properties.put("bits_per_pixel", new Integer(bitsPerPixel));
        
        // As BMP always has 3 rgb bands, except for Version 5,
        // which is bgra
        numBands = 3;
        if (bitmapOffset == 0)
            bitmapOffset = size;
        if (size == 12) {
            // Windows 2.x and OS/2 1.x
            properties.put("bmp_version", "BMP v. 2.x");
            
            // Classify the image type
            if (bitsPerPixel == 1) {
                imageType = VERSION_2_1_BIT;
            } else if (bitsPerPixel == 4) {
                imageType = VERSION_2_4_BIT;
            } else if (bitsPerPixel == 8) {
                imageType = VERSION_2_8_BIT;
            } else if (bitsPerPixel == 24) {
                imageType = VERSION_2_24_BIT;
            }
            
            // Read in the palette
            int numberOfEntries = (int)((bitmapOffset-14-size) / 3);
            int sizeOfPalette = numberOfEntries*3;
            if (bitmapOffset == size) {
                switch (imageType) {
                    case VERSION_2_1_BIT:
                        sizeOfPalette = 2 * 3;
                        break;
                    case VERSION_2_4_BIT:
                        sizeOfPalette = 16 * 3;
                        break;
                    case VERSION_2_8_BIT:
                        sizeOfPalette = 256 * 3;
                        break;
                    case VERSION_2_24_BIT:
                        sizeOfPalette = 0;
                        break;
                }
                bitmapOffset = size + sizeOfPalette;
            }
            readPalette(sizeOfPalette);
        } else {
            
            compression = readDWord(inputStream);
            imageSize = readDWord(inputStream);