picture.java

java 读写word excel ppt

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.poi.hslf.model;

import org.apache.poi.ddf.*;
import org.apache.poi.hslf.usermodel.PictureData;
import org.apache.poi.hslf.usermodel.SlideShow;
import org.apache.poi.hslf.record.Document;
import org.apache.poi.hslf.blip.Bitmap;
import org.apache.poi.util.POILogger;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.List;
import java.util.Arrays;


/**
 * Represents a picture in a PowerPoint document.
 *
 * @author Yegor Kozlov
 */
public class Picture extends SimpleShape {

    /**
    *  Windows Enhanced Metafile (EMF)
    */
    public static final int EMF = 2;

    /**
    *  Windows Metafile (WMF)
    */
    public static final int WMF = 3;

    /**
    * Macintosh PICT
    */
    public static final int PICT = 4;

    /**
    *  JPEG
    */
    public static final int JPEG = 5;

    /**
    *  PNG
    */
    public static final int PNG = 6;

    /**
     * Windows DIB (BMP)
     */
    public static final byte DIB = 7;
    
    /**
     * Create a new <code>Picture</code>
     *
    * @param idx the index of the picture
     */
    public Picture(int idx){
        super(null, null);
        _escherContainer = createSpContainer(idx);
    }

    /**
      * Create a <code>Picture</code> object
      *
      * @param escherRecord the <code>EscherSpContainer</code> record which holds information about
      *        this picture in the <code>Slide</code>
      * @param parent the parent shape of this picture
      */
     protected Picture(EscherContainerRecord escherRecord, Shape parent){
        super(escherRecord, parent);
    }

    /**
     * Returns index associated with this picture.
     * Index starts with 1 and points to a EscherBSE record which
     * holds information about this picture.
     *
     * @return the index to this picture (1 based).
     */
    public int getPictureIndex(){
        EscherOptRecord opt = (EscherOptRecord)getEscherChild(_escherContainer, EscherOptRecord.RECORD_ID);
        EscherSimpleProperty prop = (EscherSimpleProperty)getEscherProperty(opt, EscherProperties.BLIP__BLIPTODISPLAY + 0x4000);
        return prop == null ? 0 : prop.getPropertyValue();
    }

    /**
     * Create a new Picture and populate the inital structure of the <code>EscherSp</code> record which holds information about this picture.

     * @param idx the index of the picture which referes to <code>EscherBSE</code> container.
     * @return the create Picture object
     */
    protected EscherContainerRecord createSpContainer(int idx) {
        EscherContainerRecord spContainer = super.createSpContainer(false);
        spContainer.setOptions((short)15);

        EscherSpRecord spRecord = spContainer.getChildById(EscherSpRecord.RECORD_ID);
        spRecord.setOptions((short)((ShapeTypes.PictureFrame << 4) | 0x2));

        //set default properties for a picture
        EscherOptRecord opt = (EscherOptRecord)getEscherChild(spContainer, EscherOptRecord.RECORD_ID);
        setEscherProperty(opt, EscherProperties.PROTECTION__LOCKAGAINSTGROUPING, 8388736);

        //another weird feature of powerpoint: for picture id we must add 0x4000.
        setEscherProperty(opt, (short)(EscherProperties.BLIP__BLIPTODISPLAY + 0x4000), idx);

        return spContainer;
    }

    /**
     * Resize this picture to the default size.
     * For PNG and JPEG resizes the image to 100%,
     * for other types sets the default size of 200x200 pixels.  
     */
    public void setDefaultSize(){
        PictureData pict = getPictureData();
        if (pict  instanceof Bitmap){
            BufferedImage img = null;
            try {
               	img = ImageIO.read(new ByteArrayInputStream(pict.getData()));
            } 
            catch (IOException e){}
        	catch (NegativeArraySizeException ne) {}
        	
            if(img != null) {
            	// Valid image, set anchor from it
            	setAnchor(new java.awt.Rectangle(0, 0, img.getWidth()*POINT_DPI/PIXEL_DPI, img.getHeight()*POINT_DPI/PIXEL_DPI));
            } else {
            	// Invalid image, go with the default metafile size
            	setAnchor(new java.awt.Rectangle(0, 0, 200, 200));
            }
        } else {
            //default size of a metafile picture is 200x200 
            setAnchor(new java.awt.Rectangle(50, 50, 200, 200));
        }
    }

    /**
     * Returns the picture data for this picture.
     *
     * @return the picture data for this picture.
     */
    public PictureData getPictureData(){
        SlideShow ppt = getSheet().getSlideShow();
        PictureData[] pict = ppt.getPictureData();
        Document doc = ppt.getDocumentRecord();
        EscherContainerRecord dggContainer = doc.getPPDrawingGroup().getDggContainer();
        EscherContainerRecord bstore = (EscherContainerRecord)Shape.getEscherChild(dggContainer, EscherContainerRecord.BSTORE_CONTAINER);

        List lst = bstore.getChildRecords();
        int idx = getPictureIndex();
        if (idx == 0){
            logger.log(POILogger.ERROR, "no reference to picture data found ");
        } else {
            EscherBSERecord bse = (EscherBSERecord)lst.get(idx-1);
            for ( int i = 0; i < pict.length; i++ ) {
                if (pict[i].getOffset() ==  bse.getOffset()){
                    return pict[i];
                }
            }
            logger.log(POILogger.ERROR, "no picture found for our BSE offset " + bse.getOffset());
        }
        return null;
    }

    /**
     * By default set the orininal image size
     */
    protected void afterInsert(Sheet sh){
        java.awt.Rectangle anchor = getAnchor();
        if (anchor.equals(new java.awt.Rectangle())){
            setDefaultSize();
        }
    }

}