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Copy pathPDFImage.java
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/*
* $Id: PDFImage.java,v 1.2 2007/08/26 18:56:35 gil1 Exp $
*
* $Date: 2007/08/26 18:56:35 $
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package pdf;
import java.awt.Image;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import java.util.zip.*;
/**
* <p>This implements the Image XObject. Calling one of the
* <code>drawImage</code> methods of <code>PDFGraphics</code> will
* put all the necessary code into the pdf file, and the image will
* be encoded in ascii base 85, then deflated in zip format.</p>
*
* @author Eric Z. Beard (original version by Peter Mount)
* @author Matthew Hreljac, mhreljac@hotmail.com
* @version $Revision: 1.2 $, $Date: 2007/08/26 18:56:35 $
*/
public class PDFImage extends PDFStream implements ImageObserver, Serializable
{
/*
* NOTE: The original class is the work of Peter T. Mount, who released it
* in the uk.org.retep.pdf package. It was modified by Eric Z. Beard as
* follows:
* The package name was changed to gnu.jpdf.
* The formatting was changed a little bit.
* Images were not yet implemented, so the core of this
* class was mostly rewritten
* It is still licensed under the LGPL.
* Got some help with base85 methods from Mathew Hreljac
*/
// Dimensions of the object.
private int objwidth;
private int objheight;
// Dimensions of the image.
private int width;
private int height;
private Image img;
private String name;
/**
* Creates a new <code>PDFImage</code> instance.
*
*/
public PDFImage()
{
super("/XObject");
}
/**
* Creates a new <code>PDFImage</code> instance.
*
* @param img an <code>Image</code> value
*/
public PDFImage(Image img) {
this();
setImage(img, 0, 0, img.getWidth(this), img.getHeight(this), this);
}
/**
* Creates a new <code>PDFImage</code> instance.
*
* @param img an <code>Image</code> value
* @param x an <code>int</code> value
* @param y an <code>int</code> value
* @param w an <code>int</code> value
* @param h an <code>int</code> value
* @param obs an <code>ImageObserver</code> value
*/
public PDFImage(Image img,int x,int y,int w,int h,ImageObserver obs) {
this();
objwidth = w;
objheight = h;
setImage(img, x, y, img.getWidth(this), img.getHeight(this), obs);
}
/**
* Get the value of width.
* @return value of width.
*/
public int getWidth() {
return width;
}
/**
* Set the value of width.
* @param v Value to assign to width.
*/
public void setWidth(int v) {
this.width = v;
}
/**
* Get the value of height.
* @return value of height.
*/
public int getHeight() {
return height;
}
/**
* Set the value of height.
* @param v Value to assign to height.
*/
public void setHeight(int v) {
this.height = v;
}
/**
* Set the name
*
* @param n a <code>String</code> value
*/
public void setName(String n) {
name = n;
}
/**
* Get the name
*
* @return a <code>String</code> value
*/
public String getName() {
return name;
}
/**
* Set the image
*
* @param img an <code>Image</code> value
* @param x an <code>int</code> value
* @param y an <code>int</code> value
* @param w an <code>int</code> value
* @param h an <code>int</code> value
* @param obs an <code>ImageObserver</code> value
*/
public void setImage(Image img,int x,int y,int w,int h,ImageObserver obs) {
this.img = img;
width = w;
height = h;
}
/**
* <p>Adobe's base 85 does not follow the format used by ipv6
* addresses. It simply starts with 33 and goes straight up without
* skipping any characters</p>
*
* <p>Parts of this method contributed by Mathew Hreljac</p>
*
* @param stringToEncode a <code>String</code> value
* @return a <code>String</code> value
*/
private String base85Encoding(String stringToEncode)
throws NumberFormatException {
if ((stringToEncode == null) || (stringToEncode.length() == 0)) {
//System.out.println("PDFImage.base85Encoding() null or blank String");
return "";
}
if ((stringToEncode.length() > 8) ||
((stringToEncode.length() % 2) != 0)) {
System.out.println("PDFImage.base85Encoding, Incorrect tuple length: " +
stringToEncode.length());
return "";
}
//System.out.println("str: " + stringToEncode);
// String buffer to use to return the String encoding
StringBuffer sb = new StringBuffer();
// Deal with a partial tuple (less than 8 hex digits)
// From Adobe's docs:
// "Given n (1, 2 or 3) bytes of binary data, the encoding first
// appends 4 - n zero bytes to make a complete 4-tuple. This 4-tuple
// is encoded in the usual way, but without applying the special
// z-case. Finally, only the first n+1 characters of the resulting
// 5-tuple are written out. Those characters are immediately followed
// by the EOD marker, ~>"
int numHexDigits = stringToEncode.length() / 2;
int numAppendBytes = 4 - numHexDigits;
for (int i = 0; i < numAppendBytes; i++) {
stringToEncode += "00";
}
Vector<Integer> digitVector = new Vector<Integer>();
long number = Long.parseLong(stringToEncode, 16);
int remainder = 0;
while (number >= 85) {
remainder = (int) (number % 85);
number = number / 85;
digitVector.add( 0, new Integer( remainder ) );
}
digitVector.add( 0, new Integer( (int)number ) );
for ( int i = 0; i < digitVector.size(); i++) {
char c = (char) (((Integer)digitVector.elementAt(i)).intValue() + 33);
sb.append(c);
}
String tuple = sb.toString();
int len = tuple.length();
switch (len) {
case 1: tuple = "!!!!" + tuple; break;
case 2: tuple = "!!!" + tuple; break;
case 3: tuple = "!!" + tuple; break;
case 4: tuple = "!" + tuple; break;
default: break;
} // end switch
//System.out.println("enc tuple: " + tuple);
return (tuple);
} // end base85encoding
/**
* Writes the image to the stream
*
* @param os an <code>OutputStream</code> value
* @exception IOException if an error occurs
*/
public void writeStream(OutputStream os) throws IOException {
// This is a non-deflated stream
/*
os.write("/Length ".getBytes());
// Accout for stream\n ... >\nendstream
os.write(Integer.toString(buf.size() + 18).getBytes());
os.write("\n/Filter /ASCII85Decode".getBytes());
os.write("\n>>\nstream\n".getBytes());
buf.writeTo(os);
os.write(">\nendstream\nendobj\n\n".getBytes());
*/
ByteArrayOutputStream b = new ByteArrayOutputStream();
DeflaterOutputStream dos = new DeflaterOutputStream(b);
buf.writeTo(dos);
dos.finish();
dos.close();
// FlatDecode is compatible with the java.util.zip.Deflater class
//os.write("/Filter [/FlateDecode /ASCIIHexDecode]\n".getBytes());
os.write("/Filter [/FlateDecode /ASCII85Decode]\n".getBytes());
os.write("/Length ".getBytes());
os.write(Integer.toString(b.size()).getBytes());
os.write("\n>>\nstream\n".getBytes());
b.writeTo(os);
os.write("\nendstream\nendobj\n".getBytes());
} // end writeStream
/**
* <p>Compression needs to be improved here</p>
*
* @param os OutputStream to send the object to
* @exception IOException on error
*/
public void write(OutputStream os) throws IOException
{
writeStart(os);
// write the extra details
os.write("/Subtype /Image\n/Name ".getBytes());
os.write(name.getBytes());
os.write("\n/Width ".getBytes());
os.write(Integer.toString(width).getBytes());
os.write("\n/Height ".getBytes());
os.write(Integer.toString(height).getBytes());
os.write("\n/BitsPerComponent 8\n/ColorSpace /DeviceRGB\n".getBytes());
// write the pixels to the stream
//System.err.println("Processing image "+width+"x"+height+" pixels");
ByteArrayOutputStream bos = getStream();
int w = width;
int h = height;
int x = 0;
int y = 0;
int[] pixels = new int[w * h];
PixelGrabber pg = new PixelGrabber(img, x, y, w, h, pixels, 0, w);
try {
pg.grabPixels();
} catch (InterruptedException e) {
System.err.println("interrupted waiting for pixels!");
return;
}
if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
System.err.println("image fetch aborted or errored");
return;
}
StringBuffer out = new StringBuffer();
for (int j = 0; j < h; j++) {
for (int i = 0; i < w; i++) {
//System.out.print("p[" + j * w + i+ "]=" + pixels[j * w + i] + ".");
out.append(handlePixel(x+i, y+j, pixels[j * w + i]));
if (out.toString().length() >= 8) {
String tuple = out.substring(0, 8);
out.delete(0, 8);
// Convert !!!!! to 'z'
String encTuple = base85Encoding(tuple);
if (encTuple.equals("!!!!!")) {
encTuple = "z";
}
bos.write(encTuple.getBytes());
}
}
}
// This should be the only partial tuple case,
String lastTuple = base85Encoding(out.toString());
//System.out.println("lastTuple: " + lastTuple);
bos.write(lastTuple.getBytes());
bos.write("~".getBytes());
//System.out.println("Processing done");
// this will write the actual stream
setDeflate(false);
writeStream(os);
// Note: we do not call writeEnd() on streams!
}
/**
* <p>Converts a pixel to a hex string</p>
*
* @param x an <code>int</code> value
* @param y an <code>int</code> value
* @param p an <code>int</code> value
* @return a <code>String</code> value
*/
public static String handlePixel(int x, int y, int p) {
int alpha = (p >> 24) & 0xff;
int red = (p >> 16) & 0xff;
int green = (p >> 8) & 0xff;
int blue = (p ) & 0xff;
String redHex = Integer.toHexString(red);
String greenHex = Integer.toHexString(green);
String blueHex = Integer.toHexString(blue);
if (redHex.length() == 1) {
redHex = "0" + redHex;
}
if (greenHex.length() == 1) {
greenHex = "0" + greenHex;
}
if (blueHex.length() == 1) {
blueHex = "0" + blueHex;
}
return redHex + greenHex + blueHex;
} // end handlePixel
/**
* Describe <code>imageUpdate</code> method here.
*
* @param img an <code>Image</code> value
* @param infoflags an <code>int</code> value
* @param x an <code>int</code> value
* @param y an <code>int</code> value
* @param w an <code>int</code> value
* @param h an <code>int</code> value
* @return a <code>boolean</code> value
*/
public boolean imageUpdate(Image img,int infoflags,int x,int y,int w,int h) {
System.err.println("img="+img+"\ninfoflags="+infoflags+
"\nx="+x+" y="+y+" w="+w+" h="+h);
//if(img == this.img) {
if(infoflags==ImageObserver.WIDTH)
width = w;
if(infoflags==ImageObserver.HEIGHT)
height = h;
//return true;
//}
return false;
}
} // end class PDFImage
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