src/swingjs/api/js/HTML5Canvas.java

   1 package swingjs.api.js;
   2
   3 import java.awt.image.BufferedImage;
   4
   5 public interface HTML5Canvas extends DOMNode {
   6
   7         HTML5CanvasContext2D getContext(String str2d);
   8
   9         /*
  10          * Retrieves the byte[] data buffer from an HTML5 CANVAS element, optionally
  11          * first setting its contents to a source IMG, CANVAS, or VIDEO element.
  12          *
  13          */
  14         static byte[] getDataBufferBytes(HTML5Canvas canvas, DOMNode sourceNode, int w, int h) {
  15                 if (sourceNode != null) {
  16                         DOMNode.setAttrInt(canvas, "width", w);
  17                         DOMNode.setAttrInt(canvas, "height", h);
  18                 }
  19                 HTML5CanvasContext2D ctx = canvas.getContext("2d");
  20                 if (sourceNode != null) {
  21                         ctx.drawImage(sourceNode, 0, 0, w, h);
  22                 }
  23                 // Coerse int[] to byte[]
  24                 return (byte[]) (Object) ctx.getImageData(0, 0, w, h).data;
  25         }
  26
  27         /**
  28          * Install a source image (img, video, or canvas) into a matching BufferedImage
  29          *
  30          * @param sourceNode
  31          * @param image
  32          */
  33         static void setImageNode(DOMNode sourceNode, BufferedImage image) {
  34                 /**
  35                  * @j2sNative
  36                  *
  37                  *                      image._setImageNode$O$Z(sourceNode, false);
  38                  *
  39                  */             {
  40                         // image._setImageNode(sourceNode, false);
  41                  }
  42         }
  43
  44
  45
  46         static HTML5Canvas createCanvas(int width, int height, String id) {
  47                 HTML5Canvas canvas = (HTML5Canvas) DOMNode.createElement("canvas", (id == null ? "img" + Math.random() : id + ""));
  48                 DOMNode.setStyles(canvas, "width", width + "px", "height", height + "px");
  49                 /**
  50                  * @j2sNative
  51                  *
  52                  * canvas.width = width;
  53                  * canvas.height = height;
  54                  *
  55                  */
  56                 return canvas;
  57         }
  58
  59 }