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(function(){
  var Util = _html2canvas.Util,
    Generate = {};

  _html2canvas.Generate = Generate;

  var reGradients = [
  /^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
  /^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
  /^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)\-]+)\)$/,
  /^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,
  /^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/,
  /^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\(\)]+)\)$/,
  /^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/
  ];

  /*
 * TODO: Add IE10 vendor prefix (-ms) support
 * TODO: Add W3C gradient (linear-gradient) support
 * TODO: Add old Webkit -webkit-gradient(radial, ...) support
 * TODO: Maybe some RegExp optimizations are possible ;o)
 */
  Generate.parseGradient = function(css, bounds) {
    var gradient, i, len = reGradients.length, m1, stop, m2, m2Len, step, m3, tl,tr,br,bl;

    for(i = 0; i < len; i+=1){
      m1 = css.match(reGradients[i]);
      if(m1) {
        break;
      }
    }

    if(m1) {
      switch(m1[1]) {
        case '-webkit-linear-gradient':
        case '-o-linear-gradient':

          gradient = {
            type: 'linear',
            x0: null,
            y0: null,
            x1: null,
            y1: null,
            colorStops: []
          };

          // get coordinates
          m2 = m1[2].match(/\w+/g);
          if(m2){
            m2Len = m2.length;
            for(i = 0; i < m2Len; i+=1){
              switch(m2[i]) {
                case 'top':
                  gradient.y0 = 0;
                  gradient.y1 = bounds.height;
                  break;

                case 'right':
                  gradient.x0 = bounds.width;
                  gradient.x1 = 0;
                  break;

                case 'bottom':
                  gradient.y0 = bounds.height;
                  gradient.y1 = 0;
                  break;

                case 'left':
                  gradient.x0 = 0;
                  gradient.x1 = bounds.width;
                  break;
              }
            }
          }
          if(gradient.x0 === null && gradient.x1 === null){ // center
            gradient.x0 = gradient.x1 = bounds.width / 2;
          }
          if(gradient.y0 === null && gradient.y1 === null){ // center
            gradient.y0 = gradient.y1 = bounds.height / 2;
          }

          // get colors and stops
          m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
          if(m2){
            m2Len = m2.length;
            step = 1 / Math.max(m2Len - 1, 1);
            for(i = 0; i < m2Len; i+=1){
              m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
              if(m3[2]){
                stop = parseFloat(m3[2]);
                if(m3[3] === '%'){
                  stop /= 100;
                } else { // px - stupid opera
                  stop /= bounds.width;
                }
              } else {
                stop = i * step;
              }
              gradient.colorStops.push({
                color: m3[1],
                stop: stop
              });
            }
          }
          break;

        case '-webkit-gradient':

          gradient = {
            type: m1[2] === 'radial' ? 'circle' : m1[2], // TODO: Add radial gradient support for older mozilla definitions
            x0: 0,
            y0: 0,
            x1: 0,
            y1: 0,
            colorStops: []
          };

          // get coordinates
          m2 = m1[3].match(/(\d{1,3})%?\s(\d{1,3})%?,\s(\d{1,3})%?\s(\d{1,3})%?/);
          if(m2){
            gradient.x0 = (m2[1] * bounds.width) / 100;
            gradient.y0 = (m2[2] * bounds.height) / 100;
            gradient.x1 = (m2[3] * bounds.width) / 100;
            gradient.y1 = (m2[4] * bounds.height) / 100;
          }

          // get colors and stops
          m2 = m1[4].match(/((?:from|to|color-stop)\((?:[0-9\.]+,\s)?(?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)\))+/g);
          if(m2){
            m2Len = m2.length;
            for(i = 0; i < m2Len; i+=1){
              m3 = m2[i].match(/(from|to|color-stop)\(([0-9\.]+)?(?:,\s)?((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\)/);
              stop = parseFloat(m3[2]);
              if(m3[1] === 'from') {
                stop = 0.0;
              }
              if(m3[1] === 'to') {
                stop = 1.0;
              }
              gradient.colorStops.push({
                color: m3[3],
                stop: stop
              });
            }
          }
          break;

        case '-moz-linear-gradient':

          gradient = {
            type: 'linear',
            x0: 0,
            y0: 0,
            x1: 0,
            y1: 0,
            colorStops: []
          };

          // get coordinates
          m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);

          // m2[1] == 0%   -> left
          // m2[1] == 50%  -> center
          // m2[1] == 100% -> right

          // m2[2] == 0%   -> top
          // m2[2] == 50%  -> center
          // m2[2] == 100% -> bottom

          if(m2){
            gradient.x0 = (m2[1] * bounds.width) / 100;
            gradient.y0 = (m2[2] * bounds.height) / 100;
            gradient.x1 = bounds.width - gradient.x0;
            gradient.y1 = bounds.height - gradient.y0;
          }

          // get colors and stops
          m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}%)?)+/g);
          if(m2){
            m2Len = m2.length;
            step = 1 / Math.max(m2Len - 1, 1);
            for(i = 0; i < m2Len; i+=1){
              m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%)?/);
              if(m3[2]){
                stop = parseFloat(m3[2]);
                if(m3[3]){ // percentage
                  stop /= 100;
                }
              } else {
                stop = i * step;
              }
              gradient.colorStops.push({
                color: m3[1],
                stop: stop
              });
            }
          }
          break;

        case '-webkit-radial-gradient':
        case '-moz-radial-gradient':
        case '-o-radial-gradient':

          gradient = {
            type: 'circle',
            x0: 0,
            y0: 0,
            x1: bounds.width,
            y1: bounds.height,
            cx: 0,
            cy: 0,
            rx: 0,
            ry: 0,
            colorStops: []
          };

          // center
          m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
          if(m2){
            gradient.cx = (m2[1] * bounds.width) / 100;
            gradient.cy = (m2[2] * bounds.height) / 100;
          }

          // size
          m2 = m1[3].match(/\w+/);
          m3 = m1[4].match(/[a-z\-]*/);
          if(m2 && m3){
            switch(m3[0]){
              case 'farthest-corner':
              case 'cover': // is equivalent to farthest-corner
              case '': // mozilla removes "cover" from definition :(
                tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
                tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
                br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
                bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
                gradient.rx = gradient.ry = Math.max(tl, tr, br, bl);
                break;
              case 'closest-corner':
                tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
                tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
                br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
                bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
                gradient.rx = gradient.ry = Math.min(tl, tr, br, bl);
                break;
              case 'farthest-side':
                if(m2[0] === 'circle'){
                  gradient.rx = gradient.ry = Math.max(
                    gradient.cx,
                    gradient.cy,
                    gradient.x1 - gradient.cx,
                    gradient.y1 - gradient.cy
                    );
                } else { // ellipse

                  gradient.type = m2[0];

                  gradient.rx = Math.max(
                    gradient.cx,
                    gradient.x1 - gradient.cx
                    );
                  gradient.ry = Math.max(
                    gradient.cy,
                    gradient.y1 - gradient.cy
                    );
                }
                break;
              case 'closest-side':
              case 'contain': // is equivalent to closest-side
                if(m2[0] === 'circle'){
                  gradient.rx = gradient.ry = Math.min(
                    gradient.cx,
                    gradient.cy,
                    gradient.x1 - gradient.cx,
                    gradient.y1 - gradient.cy
                    );
                } else { // ellipse

                  gradient.type = m2[0];

                  gradient.rx = Math.min(
                    gradient.cx,
                    gradient.x1 - gradient.cx
                    );
                  gradient.ry = Math.min(
                    gradient.cy,
                    gradient.y1 - gradient.cy
                    );
                }
                break;

            // TODO: add support for "30px 40px" sizes (webkit only)
            }
          }

          // color stops
          m2 = m1[5].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
          if(m2){
            m2Len = m2.length;
            step = 1 / Math.max(m2Len - 1, 1);
            for(i = 0; i < m2Len; i+=1){
              m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
              if(m3[2]){
                stop = parseFloat(m3[2]);
                if(m3[3] === '%'){
                  stop /= 100;
                } else { // px - stupid opera
                  stop /= bounds.width;
                }
              } else {
                stop = i * step;
              }
              gradient.colorStops.push({
                color: m3[1],
                stop: stop
              });
            }
          }
          break;
      }
    }

    return gradient;
  };

  function addScrollStops(grad) {
    return function(colorStop) {
      try {
        grad.addColorStop(colorStop.stop, colorStop.color);
      }
      catch(e) {
        Util.log(['failed to add color stop: ', e, '; tried to add: ', colorStop]);
      }
    };
  }

  Generate.Gradient = function(src, bounds) {
    if(bounds.width === 0 || bounds.height === 0) {
      return;
    }

    var canvas = document.createElement('canvas'),
    ctx = canvas.getContext('2d'),
    gradient, grad;

    canvas.width = bounds.width;
    canvas.height = bounds.height;

    // TODO: add support for multi defined background gradients
    gradient = _html2canvas.Generate.parseGradient(src, bounds);

    if(gradient) {
      switch(gradient.type) {
        case 'linear':
          grad = ctx.createLinearGradient(gradient.x0, gradient.y0, gradient.x1, gradient.y1);
          gradient.colorStops.forEach(addScrollStops(grad));
          ctx.fillStyle = grad;
          ctx.fillRect(0, 0, bounds.width, bounds.height);
          break;

        case 'circle':
          grad = ctx.createRadialGradient(gradient.cx, gradient.cy, 0, gradient.cx, gradient.cy, gradient.rx);
          gradient.colorStops.forEach(addScrollStops(grad));
          ctx.fillStyle = grad;
          ctx.fillRect(0, 0, bounds.width, bounds.height);
          break;

        case 'ellipse':
          var canvasRadial = document.createElement('canvas'),
            ctxRadial = canvasRadial.getContext('2d'),
            ri = Math.max(gradient.rx, gradient.ry),
            di = ri * 2;

          canvasRadial.width = canvasRadial.height = di;

          grad = ctxRadial.createRadialGradient(gradient.rx, gradient.ry, 0, gradient.rx, gradient.ry, ri);
          gradient.colorStops.forEach(addScrollStops(grad));

          ctxRadial.fillStyle = grad;
          ctxRadial.fillRect(0, 0, di, di);

          ctx.fillStyle = gradient.colorStops[gradient.colorStops.length - 1].color;
          ctx.fillRect(0, 0, canvas.width, canvas.height);
          ctx.drawImage(canvasRadial, gradient.cx - gradient.rx, gradient.cy - gradient.ry, 2 * gradient.rx, 2 * gradient.ry);
          break;
      }
    }

    return canvas;
  };

  Generate.ListAlpha = function(number) {
    var tmp = "",
    modulus;

    do {
      modulus = number % 26;
      tmp = String.fromCharCode((modulus) + 64) + tmp;
      number = number / 26;
    }while((number*26) > 26);

    return tmp;
  };

  Generate.ListRoman = function(number) {
    var romanArray = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"],
    decimal = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1],
    roman = "",
    v,
    len = romanArray.length;

    if (number <= 0 || number >= 4000) {
      return number;
    }

    for (v=0; v < len; v+=1) {
      while (number >= decimal[v]) {
        number -= decimal[v];
        roman += romanArray[v];
      }
    }

    return roman;
  };
})();

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