src/swingjs/JSImage.java

   1 package swingjs;
   2
   3 import javajs.util.Base64;
   4 import swingjs.api.DOMNode;
   5 import java.awt.image.BufferedImage;
   6 import java.awt.image.ImageObserver;
   7
   8 public class JSImage extends BufferedImage {
   9         // a BufferedImage in name only, actually;
  10         int typeRequested;
  11         int[] pix;  // not used in Java, but may be used in JavaScript
  12         public DOMNode _imgNode; // used by JSGraphics2D directly
  13         private int width, height;
  14
  15         public JSImage() {
  16                 super(1,1, TYPE_INT_ARGB);
  17
  18         }
  19
  20         public JSImage setData(int width, int height, int[] argb) {
  21                 pix = argb;
  22                 this.width = width;
  23                 this.height = height;
  24                 getColorModel().createCompatibleWritableRaster(width, height);
  25                 return this;
  26         }
  27
  28         /**
  29          * convert [r g b a  r g b a ...] into [argb argb argb ...]
  30          *
  31          * currently does not respect transparency
  32          *
  33          * @param imgData HTML5 canvas.context.imageData.data
  34          * @return array of ARGB values
  35          *
  36          */
  37   int[] toIntARGB(int[] imgData) {
  38     /*
  39      * red=imgData.data[0];
  40      * green=imgData.data[1];
  41      * blue=imgData.data[2];
  42      * alpha=imgData.data[3];
  43      */
  44     int n = imgData.length / 4;
  45     int[] iData = new int[n];
  46     for (int i = 0, j = 0; i < n; j++)
  47       iData[i++] = (imgData[j++] << 16) | (imgData[j++] << 8) | imgData[j++] | 0xFF000000;
  48     return iData;
  49   }
  50
  51   /**
  52    * Use HTML5 to load PNG, JPG, or GIF image in order to extract its pixels
  53    *
  54    * @param b
  55    * @param type
  56    */
  57         @SuppressWarnings("unused")
  58         public void getDOMImage(byte[] b, String type) {
  59                 String dataurl = "data:image/" + type + ";base64,"  + Base64.getBase64(b).toString();
  60                 Object me = this;
  61                 DOMNode img = null;
  62                 /**
  63                  * @j2sNative
  64                  *   img = new Image(this.width, this.height);
  65                  *   //img.onLoad = function() { me.setDOMImage(img); };
  66                  *   img.src = dataurl;
  67                  */
  68                 {}
  69                 setDOMImage(img);
  70         }
  71
  72         /**
  73          * callback from Image.src = ... ; extract the int[] data from this image;
  74          * also sets img._pbuf32 for graphing
  75          *
  76          */
  77         @SuppressWarnings("unused")
  78         public void setDOMImage(DOMNode img) {
  79                 DOMNode canvas = DOMNode.createElement("canvas", "JSImage");
  80                 int w = width;
  81                 int h = height;
  82                 _imgNode = img;
  83                 /**
  84                  * @j2sNative
  85                  *
  86                  * canvas.width = w;
  87                  * canvas.height = h;
  88                  * var ctx = canvas.getContext("2d");
  89                  * ctx.drawImage(img, 0, 0, w, h);
  90                  * var data = ctx.getImageData(0, 0, w, h).data;
  91                  * img._pbuf32 = this.toIntARGB(data);
  92                  *
  93                  */
  94                 {
  95                         toIntARGB(null);
  96                 }
  97         }
  98
  99         @Override
 100         public int getHeight(ImageObserver o) {
 101                 return height;
 102         }
 103
 104         @Override
 105         public int getWidth(ImageObserver o) {
 106                 return width;
 107         }
 108
 109 }