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/*
* $Id: Gif.java,v 1.41 2003/04/29 07:27:12 blowagie Exp $
* $Name: $
*
* Copyright 2000, 2001, 2002 by Bruno Lowagie.
*
* 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/
*/
package com.lowagie.text;
import java.io.InputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
/**
* An Gif is the representation of a graphic element (GIF)
* that has to be inserted into the document
*
* @see Element
* @see Image
* @see Jpeg
* @see Png
*/
public class Gif extends Image implements Element {
// Constructors
Gif(Image image) {
super(image);
}
/**
* Constructs a Gif-object, using an url.
*
* @param url the URL where the image can be found.
*/
public Gif(URL url) throws BadElementException, IOException {
super(url);
processParameters();
}
/**
* Constructs a Gif-object, using an url.
*
* @param url the URL where the image can be found.
* @param width the width you want the image to have
* @param height the height you want the image to have.
*
* @deprecated use Image.getInstance(...) to create an Image
*/
public Gif(URL url, float width, float height) throws BadElementException, IOException {
this(url);
scaledWidth = width;
scaledHeight = height;
}
/**
* Constructs a Gif-object, using a filename.
*
* @param filename a String-representation of the file that contains the Image.
* @deprecated use Image.getInstance(...) to create an Image
*/
public Gif(String filename) throws BadElementException, MalformedURLException, IOException {
this(Image.toURL(filename));
}
/**
* Constructs a Gif-object, using a filename.
*
* @param filename a String-representation of the file that contains the Image.
* @param width the width you want the image to have
* @param height the height you want the image to have.
* @deprecated use Image.getInstance(...) to create an Image
*/
public Gif(String filename, float width, float height) throws BadElementException, MalformedURLException, IOException {
this(Image.toURL(filename), width, height);
}
/**
* Constructs a Gif-object from memory.
*
* @param img the memory image
*/
public Gif(byte[] img) throws BadElementException, IOException {
super((URL)null);
rawData = img;
processParameters();
}
/**
* Constructs a Gif-object from memory.
*
* @param img the memory image
* @param width the width you want the image to have
* @param height the height you want the image to have
*/
public Gif(byte[] img, float width, float height) throws BadElementException, IOException {
this(img);
scaledWidth = width;
scaledHeight = height;
}
// private methods
/**
* This method checks if the image is a valid GIF and processes some parameters.
*/
private void processParameters() throws BadElementException, IOException {
type = GIF;
InputStream is = null;
try {
String errorID;
if (rawData == null){
is = url.openStream();
errorID = url.toString();
}
else{
is = new java.io.ByteArrayInputStream(rawData);
errorID = "Byte array";
}
if (is.read() != 'G' || is.read() != 'I' || is.read() != 'F') {
throw new BadElementException(errorID + " is not a valid GIF-file.");
}
skip(is, 3);
scaledWidth = is.read() + (is.read() << 8);
setRight(scaledWidth);
scaledHeight = is.read() + (is.read() << 8);
setTop(scaledHeight);
}
finally {
if (is != null) {
is.close();
}
plainWidth = width();
plainHeight = height();
}
}
}
