GfA
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novnc


			
				
					
						
						
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							<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
  <head> 
    <title>Cursor Change test</title> 
    <meta charset="UTF-8"> 
    <!--
    <script type='text/javascript' 
                    src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'></script>
    -->
    <script src="../include/util.js"></script> 
    <script src="../include/webutil.js"></script> 
    <script src="../include/base64.js"></script> 
    <script src="../include/canvas.js"></script> 
  </head> 
  <body> 
        <h1>Roll over the buttons to test cursors</h1>
        <br>
        <input id=button1 type="button" value="Cursor from file (smiley face)">
        <input id=button2 type="button" value="Data URI cursor (crosshair)">
    
        <br> 
        <br> 
        <br> 
        Debug:<br> 
        <textarea id="debug" style="font-size: 9px;" cols=80 rows=25></textarea> 
        <br>
        <br>
        <canvas id="testcanvas" width="100px" height="20px">
            Canvas not supported.
        </canvas>
    
  </body> 
 
  <script> 
    function debug(str) {
        console.log(str);
        cell = $D('debug');
        cell.textContent += str + "\n";
        cell.scrollTop = cell.scrollHeight;
    }

    function makeCursor() {
        var arr = [], x, y, w = 32, h = 32, hx = 16, hy = 16;

        var IHDRsz = 40;
        var ANDsz = w * h * 4;
        var XORsz = Math.ceil( (w * h) / 8.0 );

        // Push multi-byte little-endian values
        arr.push16le = function (num) {
            this.push((num     ) & 0xFF,
                      (num >> 8) & 0xFF  );
        };
        arr.push32le = function (num) {
            this.push((num      ) & 0xFF,
                      (num >>  8) & 0xFF,
                      (num >> 16) & 0xFF,
                      (num >> 24) & 0xFF  );
        };

        // Main header
        arr.push16le(0);      // Reserved
        arr.push16le(2);      // .CUR type
        arr.push16le(1);      // Number of images, 1 for non-animated arr

        // Cursor #1
        arr.push(w);          // width
        arr.push(h);          // height
        arr.push(0);          // colors, 0 -> true-color
        arr.push(0);          // reserved
        arr.push16le(hx);     // hotspot x coordinate
        arr.push16le(hy);     // hotspot y coordinate
        arr.push32le(IHDRsz + XORsz + ANDsz); // cursor data byte size
        arr.push32le(22);     // offset of cursor data in the file

        // Infoheader for Cursor #1
        arr.push32le(IHDRsz); // Infoheader size
        arr.push32le(w);      // Cursor width
        arr.push32le(h*2);    // XOR+AND height
        arr.push16le(1);      // number of planes
        arr.push16le(32);     // bits per pixel
        arr.push32le(0);      // type of compression
        arr.push32le(XORsz + ANDsz); // Size of Image
        arr.push32le(0);
        arr.push32le(0);
        arr.push32le(0);
        arr.push32le(0);

        // XOR/color data
        for (y = h-1; y >= 0; y--) {
            for (x = 0; x < w; x++) {
                //if ((x === hx) || (y === (h-hy-1))) {
                if ((x === hx) || (y === hy)) {
                    arr.push(0xe0);  // blue
                    arr.push(0x00);  // green
                    arr.push(0x00);  // red
                    arr.push(0xff);  // alpha
                } else {
                    arr.push(0x05);  // blue
                    arr.push(0xe6);  // green
                    arr.push(0x00);  // red
                    arr.push(0x80);  // alpha
                }
            }
        }

        // AND/bitmask data (seems to be ignored)
        for (y = 0; y < h; y++) {
            for (x = 0; x < Math.ceil(w / 8); x++) {
                arr.push(0x00);
            }
        }

        debug("cursor generated");
        return arr;
    }
 
    window.onload = function() {
        debug("onload");
        var canvas, cross, cursor, cursor64;

        canvas = new Canvas({'target' : $D("testcanvas")});
        debug("canvas indicates Data URI cursor support is: " + canvas.get_cursor_uri());

        $D('button1').style.cursor="url(face.png), default";

        cursor = makeCursor();
        cursor64 = Base64.encode(cursor);
        //debug("cursor: " + cursor.slice(0,100) + " (" + cursor.length + ")");
        //debug("cursor64: " + cursor64.slice(0,100) + " (" + cursor64.length + ")");
        $D('button2').style.cursor="url(data:image/x-icon;base64," + cursor64 + "), default";

        debug("onload complete");
    }
  </script>