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