/*
 * $Id: ImgWMF.java 4784 2011-03-15 08:33:00Z blowagie $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2011 1T3XT BVBA
 * 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 1T3XT,
 * 1T3XT 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;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import com.itextpdf.text.error_messages.MessageLocalization;

import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.codec.wmf.InputMeta;
import com.itextpdf.text.pdf.codec.wmf.MetaDo;

/**
 * An <CODE>ImgWMF</CODE> is the representation of a windows metafile
 * that has to be inserted into the document
 *
 * @see         Element
 * @see         Image
 */

public class ImgWMF extends Image {
    
    // Constructors
    
    ImgWMF(Image image) {
        super(image);
    }
    
    /**
     * Constructs an <CODE>ImgWMF</CODE>-object, using an <VAR>url</VAR>.
     *
     * @param url the <CODE>URL</CODE> where the image can be found
     * @throws BadElementException on error
     * @throws IOException on error
     */
    
    public ImgWMF(URL url) throws BadElementException, IOException {
        super(url);
        processParameters();
    }
    
    /**
     * Constructs an <CODE>ImgWMF</CODE>-object, using a <VAR>filename</VAR>.
     *
     * @param filename a <CODE>String</CODE>-representation of the file that contains the image.
     * @throws BadElementException on error
     * @throws MalformedURLException on error
     * @throws IOException on error
     */
    
    public ImgWMF(String filename) throws BadElementException, MalformedURLException, IOException {
        this(Utilities.toURL(filename));
    }
    
    /**
     * Constructs an <CODE>ImgWMF</CODE>-object from memory.
     *
     * @param img the memory image
     * @throws BadElementException on error
     * @throws IOException on error
     */
    
    public ImgWMF(byte[] img) throws BadElementException, IOException {
        super((URL)null);
        rawData = img;
        originalData = img;
        processParameters();
    }
    
/**
 * This method checks if the image is a valid WMF and processes some parameters.
 * @throws BadElementException
 * @throws IOException
 */
    
    private void processParameters() throws BadElementException, IOException {
        type = IMGTEMPLATE;
        originalType = ORIGINAL_WMF;
        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";
            }
            InputMeta in = new InputMeta(is);
            if (in.readInt() != 0x9AC6CDD7)     {
                throw new BadElementException(MessageLocalization.getComposedMessage("1.is.not.a.valid.placeable.windows.metafile", errorID));
            }
            in.readWord();
            int left = in.readShort();
            int top = in.readShort();
            int right = in.readShort();
            int bottom = in.readShort();
            int inch = in.readWord();
            dpiX = 72;
            dpiY = 72;
            scaledHeight = (float)(bottom - top) / inch * 72f;
            setTop(scaledHeight);
            scaledWidth = (float)(right - left) / inch * 72f;
            setRight(scaledWidth);
        }
        finally {
            if (is != null) {
                is.close();
            }
            plainWidth = getWidth();
            plainHeight = getHeight();
        }
    }
    
    /** Reads the WMF into a template.
     * @param template the template to read to
     * @throws IOException on error
     * @throws DocumentException on error
     */    
    public void readWMF(PdfTemplate template) throws IOException, DocumentException {
        setTemplateData(template);
        template.setWidth(getWidth());
        template.setHeight(getHeight());
        InputStream is = null;
        try {
            if (rawData == null){
                is = url.openStream();
            }
            else{
                is = new java.io.ByteArrayInputStream(rawData);
            }
            MetaDo meta = new MetaDo(is, template);
            meta.readAll();
        }
        finally {
            if (is != null) {
                is.close();
            }
        }
    }
}