source/mir/misc/WebdbImage.java

   1 package mir.misc;
   2
   3 /**
   4  * Title:
   5  * Description:
   6  * Copyright:    Copyright (c) 2001
   7  * Company:      Indymedia
   8  * @author
   9  * @version 1.0
  10  */
  11
  12 import java.io.*;
  13 import javax.media.jai.*;
  14 import com.sun.media.jai.codec.*;
  15 import java.awt.image.renderable.ParameterBlock;
  16
  17 public class WebdbImage
  18 {
  19
  20         // default values for scaling
  21         private int               maxIconSize=120;
  22         private int               maxImageSize=640;
  23
  24         private byte[]            iconData;
  25         private byte[]            imageData;
  26         private int               iconWidth;
  27         private int               iconHeight;
  28
  29         // internal representation of the image
  30         private PlanarImage       planarImage;
  31
  32
  33         // constructor
  34         public WebdbImage(byte[] image)
  35                 throws IOException
  36         {
  37                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  38                 scaleImage();
  39         }
  40
  41         public WebdbImage(byte[] image, int iconMax)
  42                 throws IOException
  43         {
  44                 maxIconSize=iconMax;
  45                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  46                 scaleImage();
  47         }
  48
  49         public WebdbImage(byte[] image, int iconMax, int imageMax)
  50                 throws IOException
  51         {
  52                 maxIconSize=iconMax;
  53                 maxImageSize=imageMax;
  54                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  55                 scaleImage();
  56         }
  57
  58
  59         // acc3ssor-methods
  60         public int getIconWidth() throws IOException {
  61                 if (iconData==null) scaleIcon();
  62                 return iconWidth;
  63         }
  64
  65         public int getIconHeight() throws IOException {
  66                 if (iconData==null) scaleIcon();
  67                 return iconHeight;
  68         }
  69
  70         public int getImageWidth() {
  71                 return (int)planarImage.getWidth();
  72         }
  73
  74         public int getImageHeight() {
  75                 return (int)planarImage.getHeight();
  76         }
  77
  78         public byte[] getImage() {
  79                 if (imageData==null) {
  80                         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  81             // @todo the choice of PNG or JPEG should be made configurable
  82             JAI.create("encode", planarImage, outStream, "PNG", null);
  83                         imageData = outStream.toByteArray();
  84                 }
  85                 return imageData;
  86         }
  87
  88         public byte[] getIcon()
  89                 throws IOException
  90         {
  91                 if (iconData == null) scaleIcon();
  92                 return iconData;
  93         }
  94
  95         private void scaleImage()
  96                 throws java.io.IOException
  97         {
  98                 if (maxImageSize>0 && ( getImageHeight()> maxImageSize|| getImageWidth() >maxImageSize))
  99                 {
 100                         float scale;
 101                         if (getImageHeight() > getImageWidth())
 102                                 scale = (float)maxImageSize / (float)getImageHeight();
 103                         else
 104                                 scale = (float)maxImageSize / (float)getImageWidth();
 105
 106                         InterpolationBilinear interp = new InterpolationBilinear();
 107                         planarImage = JAI.create("scale", planarImage, scale, scale, 0.0F, 0.0F, interp);
 108                 }
 109         }
 110
 111         private void scaleIcon()
 112                 throws java.io.IOException
 113         {
 114                 if (iconData==null) {
 115                         float scale;
 116                         if (getImageHeight() > getImageWidth())
 117                                 scale = (float)maxIconSize / (float)getImageHeight();
 118                         else
 119                                 scale = (float)maxIconSize / (float)getImageWidth();
 120
 121                         InterpolationBilinear interp = new InterpolationBilinear();
 122                         PlanarImage temp = JAI.create("scale", planarImage, scale, scale, 0.0F, 0.0F, interp);
 123                         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
 124             // @todo the choice of PNG or JPEG should be made configurable
 125             JAI.create("encode", temp, outStream, "PNG", null);
 126                         iconData = outStream.toByteArray();
 127                         iconWidth=temp.getWidth();
 128                         iconHeight=temp.getHeight();
 129                 }
 130         }
 131
 132 }