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         // imageTypes
  21         public final static int        WEBDB_JPG=0;
  22         public final static int        WEBDB_GIF=1;
  23
  24         // default values for scaling
  25         private int               maxIconSize=120;
  26         private int               maxImageSize=640;
  27
  28         private byte[]            iconData;
  29         private byte[]            imageData;
  30         private int               imageType;
  31         private int               iconWidth;
  32         private int               iconHeight;
  33
  34         // internal representation of the image
  35         private PlanarImage       planarImage;
  36
  37
  38         // constructor
  39         public WebdbImage(byte[] image, int type)
  40                 throws IOException
  41         {
  42                 imageType=type;
  43                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  44                 scaleImage();
  45         }
  46
  47         public WebdbImage(byte[] image, int type, int iconMax)
  48                 throws IOException
  49         {
  50                 imageType=type;
  51                 maxIconSize=iconMax;
  52                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  53                 scaleImage();
  54         }
  55
  56         public WebdbImage(byte[] image, int type, int iconMax, int imageMax)
  57                 throws IOException
  58         {
  59                 imageType=type;
  60                 maxIconSize=iconMax;
  61                 maxImageSize=imageMax;
  62                 planarImage = JAI.create("stream",new ByteArraySeekableStream(image));
  63                 scaleImage();
  64         }
  65
  66
  67         // acc3ssor-methods
  68         public int getIconWidth() throws IOException {
  69                 if (iconData==null) scaleIcon();
  70                 return iconWidth;
  71         }
  72
  73         public int getIconHeight() throws IOException {
  74                 if (iconData==null) scaleIcon();
  75                 return iconHeight;
  76         }
  77
  78         public int getImageWidth() {
  79                 return (int)planarImage.getWidth();
  80         }
  81
  82         public int getImageHeight() {
  83                 return (int)planarImage.getHeight();
  84         }
  85
  86         public byte[] getImage() {
  87                 if (imageData==null) {
  88                         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  89             // @todo the choice of PNG or JPEG should be made configurable
  90             JAI.create("encode", planarImage, outStream, "PNG", null);
  91                         imageData = outStream.toByteArray();
  92                 }
  93                 return imageData;
  94         }
  95
  96         public byte[] getIcon()
  97                 throws IOException
  98         {
  99                 if (iconData == null) scaleIcon();
 100                 return iconData;
 101         }
 102
 103         private void scaleImage()
 104                 throws java.io.IOException
 105         {
 106                 if (maxImageSize>0 && ( getImageHeight()> maxImageSize|| getImageWidth() >maxImageSize))
 107                 {
 108                         float scale;
 109                         if (getImageHeight() > getImageWidth())
 110                                 scale = (float)maxImageSize / (float)getImageHeight();
 111                         else
 112                                 scale = (float)maxImageSize / (float)getImageWidth();
 113
 114                         InterpolationBilinear interp = new InterpolationBilinear();
 115                         planarImage = JAI.create("scale", planarImage, scale, scale, 0.0F, 0.0F, interp);
 116                 }
 117         }
 118
 119         private void scaleIcon()
 120                 throws java.io.IOException
 121         {
 122                 if (iconData==null) {
 123                         float scale;
 124                         if (getImageHeight() > getImageWidth())
 125                                 scale = (float)maxIconSize / (float)getImageHeight();
 126                         else
 127                                 scale = (float)maxIconSize / (float)getImageWidth();
 128
 129                         InterpolationBilinear interp = new InterpolationBilinear();
 130                         PlanarImage temp = JAI.create("scale", planarImage, scale, scale, 0.0F, 0.0F, interp);
 131                         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
 132             // @todo the choice of PNG or JPEG should be made configurable
 133             JAI.create("encode", temp, outStream, "PNG", null);
 134                         iconData = outStream.toByteArray();
 135                         iconWidth=temp.getWidth();
 136                         iconHeight=temp.getHeight();
 137                 }
 138         }
 139
 140 }