text: !(function () {
    // alignment pattern
    var adelta = [
      0,
      11,
      15,
      19,
      23,
      27,
      31,
      16,
      18,
      20,
      22,
      24,
      26,
      28,
      20,
      22,
      24,
      24,
      26,
      28,
      28,
      22,
      24,
      24,
      26,
      26,
      28,
      28,
      24,
      24,
      26,
      26,
      26,
      28,
      28,
      24,
      26,
      26,
      26,
      28,
      28
    ];
  
    // version block
    var vpat = [
      0xc94,
      0x5bc,
      0xa99,
      0x4d3,
      0xbf6,
      0x762,
      0x847,
      0x60d,
      0x928,
      0xb78,
      0x45d,
      0xa17,
      0x532,
      0x9a6,
      0x683,
      0x8c9,
      0x7ec,
      0xec4,
      0x1e1,
      0xfab,
      0x08e,
      0xc1a,
      0x33f,
      0xd75,
      0x250,
      0x9d5,
      0x6f0,
      0x8ba,
      0x79f,
      0xb0b,
      0x42e,
      0xa64,
      0x541,
      0xc69
    ];
  
    // final format bits with mask: level << 3 | mask
    var fmtword = [
      0x77c4,
      0x72f3,
      0x7daa,
      0x789d,
      0x662f,
      0x6318,
      0x6c41,
      0x6976, //L
      0x5412,
      0x5125,
      0x5e7c,
      0x5b4b,
      0x45f9,
      0x40ce,
      0x4f97,
      0x4aa0, //M
      0x355f,
      0x3068,
      0x3f31,
      0x3a06,
      0x24b4,
      0x2183,
      0x2eda,
      0x2bed, //Q
      0x1689,
      0x13be,
      0x1ce7,
      0x19d0,
      0x0762,
      0x0255,
      0x0d0c,
      0x083b //H
    ];
  
    // 4 per version: number of blocks 1,2; data width; ecc width
    var eccblocks = [
      1,
      0,
      19,
      7,
      1,
      0,
      16,
      10,
      1,
      0,
      13,
      13,
      1,
      0,
      9,
      17,
      1,
      0,
      34,
      10,
      1,
      0,
      28,
      16,
      1,
      0,
      22,
      22,
      1,
      0,
      16,
      28,
      1,
      0,
      55,
      15,
      1,
      0,
      44,
      26,
      2,
      0,
      17,
      18,
      2,
      0,
      13,
      22,
      1,
      0,
      80,
      20,
      2,
      0,
      32,
      18,
      2,
      0,
      24,
      26,
      4,
      0,
      9,
      16,
      1,
      0,
      108,
      26,
      2,
      0,
      43,
      24,
      2,
      2,
      15,
      18,
      2,
      2,
      11,
      22,
      2,
      0,
      68,
      18,
      4,
      0,
      27,
      16,
      4,
      0,
      19,
      24,
      4,
      0,
      15,
      28,
      2,
      0,
      78,
      20,
      4,
      0,
      31,
      18,
      2,
      4,
      14,
      18,
      4,
      1,
      13,
      26,
      2,
      0,
      97,
      24,
      2,
      2,
      38,
      22,
      4,
      2,
      18,
      22,
      4,
      2,
      14,
      26,
      2,
      0,
      116,
      30,
      3,
      2,
      36,
      22,
      4,
      4,
      16,
      20,
      4,
      4,
      12,
      24,
      2,
      2,
      68,
      18,
      4,
      1,
      43,
      26,
      6,
      2,
      19,
      24,
      6,
      2,
      15,
      28,
      4,
      0,
      81,
      20,
      1,
      4,
      50,
      30,
      4,
      4,
      22,
      28,
      3,
      8,
      12,
      24,
      2,
      2,
      92,
      24,
      6,
      2,
      36,
      22,
      4,
      6,
      20,
      26,
      7,
      4,
      14,
      28,
      4,
      0,
      107,
      26,
      8,
      1,
      37,
      22,
      8,
      4,
      20,
      24,
      12,
      4,
      11,
      22,
      3,
      1,
      115,
      30,
      4,
      5,
      40,
      24,
      11,
      5,
      16,
      20,
      11,
      5,
      12,
      24,
      5,
      1,
      87,
      22,
      5,
      5,
      41,
      24,
      5,
      7,
      24,
      30,
      11,
      7,
      12,
      24,
      5,
      1,
      98,
      24,
      7,
      3,
      45,
      28,
      15,
      2,
      19,
      24,
      3,
      13,
      15,
      30,
      1,
      5,
      107,
      28,
      10,
      1,
      46,
      28,
      1,
      15,
      22,
      28,
      2,
      17,
      14,
      28,
      5,
      1,
      120,
      30,
      9,
      4,
      43,
      26,
      17,
      1,
      22,
      28,
      2,
      19,
      14,
      28,
      3,
      4,
      113,
      28,
      3,
      11,
      44,
      26,
      17,
      4,
      21,
      26,
      9,
      16,
      13,
      26,
      3,
      5,
      107,
      28,
      3,
      13,
      41,
      26,
      15,
      5,
      24,
      30,
      15,
      10,
      15,
      28,
      4,
      4,
      116,
      28,
      17,
      0,
      42,
      26,
      17,
      6,
      22,
      28,
      19,
      6,
      16,
      30,
      2,
      7,
      111,
      28,
      17,
      0,
      46,
      28,
      7,
      16,
      24,
      30,
      34,
      0,
      13,
      24,
      4,
      5,
      121,
      30,
      4,
      14,
      47,
      28,
      11,
      14,
      24,
      30,
      16,
      14,
      15,
      30,
      6,
      4,
      117,
      30,
      6,
      14,
      45,
      28,
      11,
      16,
      24,
      30,
      30,
      2,
      16,
      30,
      8,
      4,
      106,
      26,
      8,
      13,
      47,
      28,
      7,
      22,
      24,
      30,
      22,
      13,
      15,
      30,
      10,
      2,
      114,
      28,
      19,
      4,
      46,
      28,
      28,
      6,
      22,
      28,
      33,
      4,
      16,
      30,
      8,
      4,
      122,
      30,
      22,
      3,
      45,
      28,
      8,
      26,
      23,
      30,
      12,
      28,
      15,
      30,
      3,
      10,
      117,
      30,
      3,
      23,
      45,
      28,
      4,
      31,
      24,
      30,
      11,
      31,
      15,
      30,
      7,
      7,
      116,
      30,
      21,
      7,
      45,
      28,
      1,
      37,
      23,
      30,
      19,
      26,
      15,
      30,
      5,
      10,
      115,
      30,
      19,
      10,
      47,
      28,
      15,
      25,
      24,
      30,
      23,
      25,
      15,
      30,
      13,
      3,
      115,
      30,
      2,
      29,
      46,
      28,
      42,
      1,
      24,
      30,
      23,
      28,
      15,
      30,
      17,
      0,
      115,
      30,
      10,
      23,
      46,
      28,
      10,
      35,
      24,
      30,
      19,
      35,
      15,
      30,
      17,
      1,
      115,
      30,
      14,
      21,
      46,
      28,
      29,
      19,
      24,
      30,
      11,
      46,
      15,
      30,
      13,
      6,
      115,
      30,
      14,
      23,
      46,
      28,
      44,
      7,
      24,
      30,
      59,
      1,
      16,
      30,
      12,
      7,
      121,
      30,
      12,
      26,
      47,
      28,
      39,
      14,
      24,
      30,
      22,
      41,
      15,
      30,
      6,
      14,
      121,
      30,
      6,
      34,
      47,
      28,
      46,
      10,
      24,
      30,
      2,
      64,
      15,
      30,
      17,
      4,
      122,
      30,
      29,
      14,
      46,
      28,
      49,
      10,
      24,
      30,
      24,
      46,
      15,
      30,
      4,
      18,
      122,
      30,
      13,
      32,
      46,
      28,
      48,
      14,
      24,
      30,
      42,
      32,
      15,
      30,
      20,
      4,
      117,
      30,
      40,
      7,
      47,
      28,
      43,
      22,
      24,
      30,
      10,
      67,
      15,
      30,
      19,
      6,
      118,
      30,
      18,
      31,
      47,
      28,
      34,
      34,
      24,
      30,
      20,
      61,
      15,
      30
    ];
  
    // Galois field log table
    var glog = [
      0xff,
      0x00,
      0x01,
      0x19,
      0x02,
      0x32,
      0x1a,
      0xc6,
      0x03,
      0xdf,
      0x33,
      0xee,
      0x1b,
      0x68,
      0xc7,
      0x4b,
      0x04,
      0x64,
      0xe0,
      0x0e,
      0x34,
      0x8d,
      0xef,
      0x81,
      0x1c,
      0xc1,
      0x69,
      0xf8,
      0xc8,
      0x08,
      0x4c,
      0x71,
      0x05,
      0x8a,
      0x65,
      0x2f,
      0xe1,
      0x24,
      0x0f,
      0x21,
      0x35,
      0x93,
      0x8e,
      0xda,
      0xf0,
      0x12,
      0x82,
      0x45,
      0x1d,
      0xb5,
      0xc2,
      0x7d,
      0x6a,
      0x27,
      0xf9,
      0xb9,
      0xc9,
      0x9a,
      0x09,
      0x78,
      0x4d,
      0xe4,
      0x72,
      0xa6,
      0x06,
      0xbf,
      0x8b,
      0x62,
      0x66,
      0xdd,
      0x30,
      0xfd,
      0xe2,
      0x98,
      0x25,
      0xb3,
      0x10,
      0x91,
      0x22,
      0x88,
      0x36,
      0xd0,
      0x94,
      0xce,
      0x8f,
      0x96,
      0xdb,
      0xbd,
      0xf1,
      0xd2,
      0x13,
      0x5c,
      0x83,
      0x38,
      0x46,
      0x40,
      0x1e,
      0x42,
      0xb6,
      0xa3,
      0xc3,
      0x48,
      0x7e,
      0x6e,
      0x6b,
      0x3a,
      0x28,
      0x54,
      0xfa,
      0x85,
      0xba,
      0x3d,
      0xca,
      0x5e,
      0x9b,
      0x9f,
      0x0a,
      0x15,
      0x79,
      0x2b,
      0x4e,
      0xd4,
      0xe5,
      0xac,
      0x73,
      0xf3,
      0xa7,
      0x57,
      0x07,
      0x70,
      0xc0,
      0xf7,
      0x8c,
      0x80,
      0x63,
      0x0d,
      0x67,
      0x4a,
      0xde,
      0xed,
      0x31,
      0xc5,
      0xfe,
      0x18,
      0xe3,
      0xa5,
      0x99,
      0x77,
      0x26,
      0xb8,
      0xb4,
      0x7c,
      0x11,
      0x44,
      0x92,
      0xd9,
      0x23,
      0x20,
      0x89,
      0x2e,
      0x37,
      0x3f,
      0xd1,
      0x5b,
      0x95,
      0xbc,
      0xcf,
      0xcd,
      0x90,
      0x87,
      0x97,
      0xb2,
      0xdc,
      0xfc,
      0xbe,
      0x61,
      0xf2,
      0x56,
      0xd3,
      0xab,
      0x14,
      0x2a,
      0x5d,
      0x9e,
      0x84,
      0x3c,
      0x39,
      0x53,
      0x47,
      0x6d,
      0x41,
      0xa2,
      0x1f,
      0x2d,
      0x43,
      0xd8,
      0xb7,
      0x7b,
      0xa4,
      0x76,
      0xc4,
      0x17,
      0x49,
      0xec,
      0x7f,
      0x0c,
      0x6f,
      0xf6,
      0x6c,
      0xa1,
      0x3b,
      0x52,
      0x29,
      0x9d,
      0x55,
      0xaa,
      0xfb,
      0x60,
      0x86,
      0xb1,
      0xbb,
      0xcc,
      0x3e,
      0x5a,
      0xcb,
      0x59,
      0x5f,
      0xb0,
      0x9c,
      0xa9,
      0xa0,
      0x51,
      0x0b,
      0xf5,
      0x16,
      0xeb,
      0x7a,
      0x75,
      0x2c,
      0xd7,
      0x4f,
      0xae,
      0xd5,
      0xe9,
      0xe6,
      0xe7,
      0xad,
      0xe8,
      0x74,
      0xd6,
      0xf4,
      0xea,
      0xa8,
      0x50,
      0x58,
      0xaf
    ];
  
    // Galios field exponent table
    var gexp = [
      0x01,
      0x02,
      0x04,
      0x08,
      0x10,
      0x20,
      0x40,
      0x80,
      0x1d,
      0x3a,
      0x74,
      0xe8,
      0xcd,
      0x87,
      0x13,
      0x26,
      0x4c,
      0x98,
      0x2d,
      0x5a,
      0xb4,
      0x75,
      0xea,
      0xc9,
      0x8f,
      0x03,
      0x06,
      0x0c,
      0x18,
      0x30,
      0x60,
      0xc0,
      0x9d,
      0x27,
      0x4e,
      0x9c,
      0x25,
      0x4a,
      0x94,
      0x35,
      0x6a,
      0xd4,
      0xb5,
      0x77,
      0xee,
      0xc1,
      0x9f,
      0x23,
      0x46,
      0x8c,
      0x05,
      0x0a,
      0x14,
      0x28,
      0x50,
      0xa0,
      0x5d,
      0xba,
      0x69,
      0xd2,
      0xb9,
      0x6f,
      0xde,
      0xa1,
      0x5f,
      0xbe,
      0x61,
      0xc2,
      0x99,
      0x2f,
      0x5e,
      0xbc,
      0x65,
      0xca,
      0x89,
      0x0f,
      0x1e,
      0x3c,
      0x78,
      0xf0,
      0xfd,
      0xe7,
      0xd3,
      0xbb,
      0x6b,
      0xd6,
      0xb1,
      0x7f,
      0xfe,
      0xe1,
      0xdf,
      0xa3,
      0x5b,
      0xb6,
      0x71,
      0xe2,
      0xd9,
      0xaf,
      0x43,
      0x86,
      0x11,
      0x22,
      0x44,
      0x88,
      0x0d,
      0x1a,
      0x34,
      0x68,
      0xd0,
      0xbd,
      0x67,
      0xce,
      0x81,
      0x1f,
      0x3e,
      0x7c,
      0xf8,
      0xed,
      0xc7,
      0x93,
      0x3b,
      0x76,
      0xec,
      0xc5,
      0x97,
      0x33,
      0x66,
      0xcc,
      0x85,
      0x17,
      0x2e,
      0x5c,
      0xb8,
      0x6d,
      0xda,
      0xa9,
      0x4f,
      0x9e,
      0x21,
      0x42,
      0x84,
      0x15,
      0x2a,
      0x54,
      0xa8,
      0x4d,
      0x9a,
      0x29,
      0x52,
      0xa4,
      0x55,
      0xaa,
      0x49,
      0x92,
      0x39,
      0x72,
      0xe4,
      0xd5,
      0xb7,
      0x73,
      0xe6,
      0xd1,
      0xbf,
      0x63,
      0xc6,
      0x91,
      0x3f,
      0x7e,
      0xfc,
      0xe5,
      0xd7,
      0xb3,
      0x7b,
      0xf6,
      0xf1,
      0xff,
      0xe3,
      0xdb,
      0xab,
      0x4b,
      0x96,
      0x31,
      0x62,
      0xc4,
      0x95,
      0x37,
      0x6e,
      0xdc,
      0xa5,
      0x57,
      0xae,
      0x41,
      0x82,
      0x19,
      0x32,
      0x64,
      0xc8,
      0x8d,
      0x07,
      0x0e,
      0x1c,
      0x38,
      0x70,
      0xe0,
      0xdd,
      0xa7,
      0x53,
      0xa6,
      0x51,
      0xa2,
      0x59,
      0xb2,
      0x79,
      0xf2,
      0xf9,
      0xef,
      0xc3,
      0x9b,
      0x2b,
      0x56,
      0xac,
      0x45,
      0x8a,
      0x09,
      0x12,
      0x24,
      0x48,
      0x90,
      0x3d,
      0x7a,
      0xf4,
      0xf5,
      0xf7,
      0xf3,
      0xfb,
      0xeb,
      0xcb,
      0x8b,
      0x0b,
      0x16,
      0x2c,
      0x58,
      0xb0,
      0x7d,
      0xfa,
      0xe9,
      0xcf,
      0x83,
      0x1b,
      0x36,
      0x6c,
      0xd8,
      0xad,
      0x47,
      0x8e,
      0x00
    ];
  
    // Working buffers:
    // data input and ecc append, image working buffer, fixed part of image, run lengths for badness
    var strinbuf = [],
      eccbuf = [],
      qrframe = [],
      framask = [],
      rlens = [];
    // Control values - width is based on version, last 4 are from table.
    var version, width, neccblk1, neccblk2, datablkw, eccblkwid;
    var ecclevel = 2;
    // set bit to indicate cell in qrframe is immutable.  symmetric around diagonal
    function setmask(x, y) {
      var bt;
      if (x > y) {
        bt = x;
        x = y;
        y = bt;
      }
      // y*y = 1+3+5...
      bt = y;
      bt *= y;
      bt += y;
      bt >>= 1;
      bt += x;
      framask[bt] = 1;
    }
  
    // enter alignment pattern - black to qrframe, white to mask (later black frame merged to mask)
    function putalign(x, y) {
      var j;
  
      qrframe[x + width * y] = 1;
      for (j = -2; j < 2; j++) {
        qrframe[x + j + width * (y - 2)] = 1;
        qrframe[x - 2 + width * (y + j + 1)] = 1;
        qrframe[x + 2 + width * (y + j)] = 1;
        qrframe[x + j + 1 + width * (y + 2)] = 1;
      }
      for (j = 0; j < 2; j++) {
        setmask(x - 1, y + j);
        setmask(x + 1, y - j);
        setmask(x - j, y - 1);
        setmask(x + j, y + 1);
      }
    }
  
    //========================================================================
    // Reed Solomon error correction
    // exponentiation mod N
    function modnn(x) {
      while (x >= 255) {
        x -= 255;
        x = (x >> 8) + (x & 255);
      }
      return x;
    }
  
    var genpoly = [];
  
    // Calculate and append ECC data to data block.  Block is in strinbuf, indexes to buffers given.
    function appendrs(data, dlen, ecbuf, eclen) {
      var i, j, fb;
  
      for (i = 0; i < eclen; i++) strinbuf[ecbuf + i] = 0;
      for (i = 0; i < dlen; i++) {
        fb = glog[strinbuf[data + i] ^ strinbuf[ecbuf]];
        if (fb != 255)
          /* fb term is non-zero */
          for (j = 1; j < eclen; j++)
            strinbuf[ecbuf + j - 1] =
              strinbuf[ecbuf + j] ^ gexp[modnn(fb + genpoly[eclen - j])];
        else
          for (j = ecbuf; j < ecbuf + eclen; j++) strinbuf[j] = strinbuf[j + 1];
        strinbuf[ecbuf + eclen - 1] =
          fb == 255 ? 0 : gexp[modnn(fb + genpoly[0])];
      }
    }
  
    //========================================================================
    // Frame data insert following the path rules
  
    // check mask - since symmetrical use half.
    function ismasked(x, y) {
      var bt;
      if (x > y) {
        bt = x;
        x = y;
        y = bt;
      }
      bt = y;
      bt += y * y;
      bt >>= 1;
      bt += x;
      return framask[bt];
    }
  
    //========================================================================
    //  Apply the selected mask out of the 8.
    function applymask(m) {
      var x, y, r3x, r3y;
  
      switch (m) {
        case 0:
          for (y = 0; y < width; y++)
            for (x = 0; x < width; x++)
              if (!((x + y) & 1) && !ismasked(x, y)) qrframe[x + y * width] ^= 1;
          break;
        case 1:
          for (y = 0; y < width; y++)
            for (x = 0; x < width; x++)
              if (!(y & 1) && !ismasked(x, y)) qrframe[x + y * width] ^= 1;
          break;
        case 2:
          for (y = 0; y < width; y++)
            for (r3x = 0, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) r3x = 0;
              if (!r3x && !ismasked(x, y)) qrframe[x + y * width] ^= 1;
            }
          break;
        case 3:
          for (r3y = 0, y = 0; y < width; y++ , r3y++) {
            if (r3y == 3) r3y = 0;
            for (r3x = r3y, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) r3x = 0;
              if (!r3x && !ismasked(x, y)) qrframe[x + y * width] ^= 1;
            }
          }
          break;
        case 4:
          for (y = 0; y < width; y++)
            for (r3x = 0, r3y = (y >> 1) & 1, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) {
                r3x = 0;
                r3y = !r3y;
              }
              if (!r3y && !ismasked(x, y)) qrframe[x + y * width] ^= 1;
            }
          break;
        case 5:
          for (r3y = 0, y = 0; y < width; y++ , r3y++) {
            if (r3y == 3) r3y = 0;
            for (r3x = 0, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) r3x = 0;
              if (!((x & y & 1) + !(!r3x | !r3y)) && !ismasked(x, y))
                qrframe[x + y * width] ^= 1;
            }
          }
          break;
        case 6:
          for (r3y = 0, y = 0; y < width; y++ , r3y++) {
            if (r3y == 3) r3y = 0;
            for (r3x = 0, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) r3x = 0;
              if (!(((x & y & 1) + (r3x && r3x == r3y)) & 1) && !ismasked(x, y))
                qrframe[x + y * width] ^= 1;
            }
          }
          break;
        case 7:
          for (r3y = 0, y = 0; y < width; y++ , r3y++) {
            if (r3y == 3) r3y = 0;
            for (r3x = 0, x = 0; x < width; x++ , r3x++) {
              if (r3x == 3) r3x = 0;
              if (!(((r3x && r3x == r3y) + ((x + y) & 1)) & 1) && !ismasked(x, y))
                qrframe[x + y * width] ^= 1;
            }
          }
          break;
      }
      return;
    }
  
    // Badness coefficients.
    var N1 = 3,
      N2 = 3,
      N3 = 40,
      N4 = 10;
  
    // Using the table of the length of each run, calculate the amount of bad image
    // - long runs or those that look like finders; called twice, once each for X and Y
    function badruns(length) {
      var i;
      var runsbad = 0;
      for (i = 0; i <= length; i++)
        if (rlens[i] >= 5) runsbad += N1 + rlens[i] - 5;
      // BwBBBwB as in finder
      for (i = 3; i < length - 1; i += 2)
        if (
          rlens[i - 2] == rlens[i + 2] &&
          rlens[i + 2] == rlens[i - 1] &&
          rlens[i - 1] == rlens[i + 1] &&
          rlens[i - 1] * 3 == rlens[i] &&
          // white around the black pattern? Not part of spec
          (rlens[i - 3] == 0 || // beginning
            i + 3 > length || // end
            rlens[i - 3] * 3 >= rlens[i] * 4 ||
            rlens[i + 3] * 3 >= rlens[i] * 4)
        )
          runsbad += N3;
      return runsbad;
    }
  
    // Calculate how bad the masked image is - blocks, imbalance, runs, or finders.
    function badcheck() {
      var x, y, h, b, b1;
      var thisbad = 0;
      var bw = 0;
  
      // blocks of same color.
      for (y = 0; y < width - 1; y++)
        for (x = 0; x < width - 1; x++)
          if (
            (qrframe[x + width * y] &&
              qrframe[x + 1 + width * y] &&
              qrframe[x + width * (y + 1)] &&
              qrframe[x + 1 + width * (y + 1)]) || // all black
            !(
              qrframe[x + width * y] ||
              qrframe[x + 1 + width * y] ||
              qrframe[x + width * (y + 1)] ||
              qrframe[x + 1 + width * (y + 1)]
            )
          )
            // all white
            thisbad += N2;
  
      // X runs
      for (y = 0; y < width; y++) {
        rlens[0] = 0;
        for (h = b = x = 0; x < width; x++) {
          if ((b1 = qrframe[x + width * y]) == b) rlens[h]++;
          else rlens[++h] = 1;
          b = b1;
          bw += b ? 1 : -1;
        }
        thisbad += badruns(h);
      }
  
      // black/white imbalance
      if (bw < 0) bw = -bw;
  
      var big = bw;
      var count = 0;
      big += big << 2;
      big <<= 1;
      while (big > width * width) (big -= width * width), count++;
      thisbad += count * N4;
  
      // Y runs
      for (x = 0; x < width; x++) {
        rlens[0] = 0;
        for (h = b = y = 0; y < width; y++) {
          if ((b1 = qrframe[x + width * y]) == b) rlens[h]++;
          else rlens[++h] = 1;
          b = b1;
        }
        thisbad += badruns(h);
      }
      return thisbad;
    }
  
    function genframe(instring) {
      var x, y, k, t, v, i, j, m;
  
      // find the smallest version that fits the string
      t = instring.length;
      version = 0;
      do {
        version++;
        k = (ecclevel - 1) * 4 + (version - 1) * 16;
        neccblk1 = eccblocks[k++];
        neccblk2 = eccblocks[k++];
        datablkw = eccblocks[k++];
        eccblkwid = eccblocks[k];
        k = datablkw * (neccblk1 + neccblk2) + neccblk2 - 3 + (version <= 9);
        if (t <= k) break;
      } while (version < 40);
  
      // FIXME - insure that it fits insted of being truncated
      width = 17 + 4 * version;
  
      // allocate, clear and setup data structures
      v = datablkw + (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
      for (t = 0; t < v; t++) eccbuf[t] = 0;
      strinbuf = instring.slice(0);
  
      for (t = 0; t < width * width; t++) qrframe[t] = 0;
  
      for (t = 0; t < (width * (width + 1) + 1) / 2; t++) framask[t] = 0;
  
      // insert finders - black to frame, white to mask
      for (t = 0; t < 3; t++) {
        k = 0;
        y = 0;
        if (t == 1) k = width - 7;
        if (t == 2) y = width - 7;
        qrframe[y + 3 + width * (k + 3)] = 1;
        for (x = 0; x < 6; x++) {
          qrframe[y + x + width * k] = 1;
          qrframe[y + width * (k + x + 1)] = 1;
          qrframe[y + 6 + width * (k + x)] = 1;
          qrframe[y + x + 1 + width * (k + 6)] = 1;
        }
        for (x = 1; x < 5; x++) {
          setmask(y + x, k + 1);
          setmask(y + 1, k + x + 1);
          setmask(y + 5, k + x);
          setmask(y + x + 1, k + 5);
        }
        for (x = 2; x < 4; x++) {
          qrframe[y + x + width * (k + 2)] = 1;
          qrframe[y + 2 + width * (k + x + 1)] = 1;
          qrframe[y + 4 + width * (k + x)] = 1;
          qrframe[y + x + 1 + width * (k + 4)] = 1;
        }
      }
  
      // alignment blocks
      if (version > 1) {
        t = adelta[version];
        y = width - 7;
        for (; ;) {
          x = width - 7;
          while (x > t - 3) {
            putalign(x, y);
            if (x < t) break;
            x -= t;
          }
          if (y <= t + 9) break;
          y -= t;
          putalign(6, y);
          putalign(y, 6);
        }
      }
  
      // single black
      qrframe[8 + width * (width - 8)] = 1;
  
      // timing gap - mask only
      for (y = 0; y < 7; y++) {
        setmask(7, y);
        setmask(width - 8, y);
        setmask(7, y + width - 7);
      }
      for (x = 0; x < 8; x++) {
        setmask(x, 7);
        setmask(x + width - 8, 7);
        setmask(x, width - 8);
      }
  
      // reserve mask-format area
      for (x = 0; x < 9; x++) setmask(x, 8);
      for (x = 0; x < 8; x++) {
        setmask(x + width - 8, 8);
        setmask(8, x);
      }
      for (y = 0; y < 7; y++) setmask(8, y + width - 7);
  
      // timing row/col
      for (x = 0; x < width - 14; x++)
        if (x & 1) {
          setmask(8 + x, 6);
          setmask(6, 8 + x);
        } else {
          qrframe[8 + x + width * 6] = 1;
          qrframe[6 + width * (8 + x)] = 1;
        }
  
      // version block
      if (version > 6) {
        t = vpat[version - 7];
        k = 17;
        for (x = 0; x < 6; x++)
          for (y = 0; y < 3; y++ , k--)
            if (1 & (k > 11 ? version >> (k - 12) : t >> k)) {
              qrframe[5 - x + width * (2 - y + width - 11)] = 1;
              qrframe[2 - y + width - 11 + width * (5 - x)] = 1;
            } else {
              setmask(5 - x, 2 - y + width - 11);
              setmask(2 - y + width - 11, 5 - x);
            }
      }
  
      // sync mask bits - only set above for white spaces, so add in black bits
      for (y = 0; y < width; y++)
        for (x = 0; x <= y; x++) if (qrframe[x + width * y]) setmask(x, y);
  
      // convert string to bitstream
      // 8 bit data to QR-coded 8 bit data (numeric or alphanum, or kanji not supported)
      v = strinbuf.length;
  
      // string to array
      for (i = 0; i < v; i++) eccbuf[i] = strinbuf.charCodeAt(i);
      strinbuf = eccbuf.slice(0);
  
      // calculate max string length
      x = datablkw * (neccblk1 + neccblk2) + neccblk2;
      if (v >= x - 2) {
        v = x - 2;
        if (version > 9) v--;
      }
  
      // shift and repack to insert length prefix
      i = v;
      if (version > 9) {
        strinbuf[i + 2] = 0;
        strinbuf[i + 3] = 0;
        while (i--) {
          t = strinbuf[i];
          strinbuf[i + 3] |= 255 & (t << 4);
          strinbuf[i + 2] = t >> 4;
        }
        strinbuf[2] |= 255 & (v << 4);
        strinbuf[1] = v >> 4;
        strinbuf[0] = 0x40 | (v >> 12);
      } else {
        strinbuf[i + 1] = 0;
        strinbuf[i + 2] = 0;
        while (i--) {
          t = strinbuf[i];
          strinbuf[i + 2] |= 255 & (t << 4);
          strinbuf[i + 1] = t >> 4;
        }
        strinbuf[1] |= 255 & (v << 4);
        strinbuf[0] = 0x40 | (v >> 4);
      }
      // fill to end with pad pattern
      i = v + 3 - (version < 10);
      while (i < x) {
        strinbuf[i++] = 0xec;
        // buffer has room    if (i == x)      break;
        strinbuf[i++] = 0x11;
      }
  
      // calculate and append ECC
  
      // calculate generator polynomial
      genpoly[0] = 1;
      for (i = 0; i < eccblkwid; i++) {
        genpoly[i + 1] = 1;
        for (j = i; j > 0; j--)
          genpoly[j] = genpoly[j]
            ? genpoly[j - 1] ^ gexp[modnn(glog[genpoly[j]] + i)]
            : genpoly[j - 1];
        genpoly[0] = gexp[modnn(glog[genpoly[0]] + i)];
      }
      for (i = 0; i <= eccblkwid; i++) genpoly[i] = glog[genpoly[i]]; // use logs for genpoly[] to save calc step
  
      // append ecc to data buffer
      k = x;
      y = 0;
      for (i = 0; i < neccblk1; i++) {
        appendrs(y, datablkw, k, eccblkwid);
        y += datablkw;
        k += eccblkwid;
      }
      for (i = 0; i < neccblk2; i++) {
        appendrs(y, datablkw + 1, k, eccblkwid);
        y += datablkw + 1;
        k += eccblkwid;
      }
      // interleave blocks
      y = 0;
      for (i = 0; i < datablkw; i++) {
        for (j = 0; j < neccblk1; j++) eccbuf[y++] = strinbuf[i + j * datablkw];
        for (j = 0; j < neccblk2; j++)
          eccbuf[y++] = strinbuf[neccblk1 * datablkw + i + j * (datablkw + 1)];
      }
      for (j = 0; j < neccblk2; j++)
        eccbuf[y++] = strinbuf[neccblk1 * datablkw + i + j * (datablkw + 1)];
      for (i = 0; i < eccblkwid; i++)
        for (j = 0; j < neccblk1 + neccblk2; j++)
          eccbuf[y++] = strinbuf[x + i + j * eccblkwid];
      strinbuf = eccbuf;
  
      // pack bits into frame avoiding masked area.
      x = y = width - 1;
      k = v = 1; // up, minus
      /* inteleaved data and ecc codes */
      m = (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
      for (i = 0; i < m; i++) {
        t = strinbuf[i];
        for (j = 0; j < 8; j++ , t <<= 1) {
          if (0x80 & t) qrframe[x + width * y] = 1;
          do {
            // find next fill position
            if (v) x--;
            else {
              x++;
              if (k) {
                if (y != 0) y--;
                else {
                  x -= 2;
                  k = !k;
                  if (x == 6) {
                    x--;
                    y = 9;
                  }
                }
              } else {
                if (y != width - 1) y++;
                else {
                  x -= 2;
                  k = !k;
                  if (x == 6) {
                    x--;
                    y -= 8;
                  }
                }
              }
            }
            v = !v;
          } while (ismasked(x, y));
        }
      }
  
      // save pre-mask copy of frame
      strinbuf = qrframe.slice(0);
      t = 0; // best
      y = 30000; // demerit
      // for instead of while since in original arduino code
      // if an early mask was "good enough" it wouldn't try for a better one
      // since they get more complex and take longer.
      for (k = 0; k < 8; k++) {
        applymask(k); // returns black-white imbalance
        x = badcheck();
        if (x < y) {
          // current mask better than previous best?
          y = x;
          t = k;
        }
        if (t == 7) break; // don't increment i to a void redoing mask
        qrframe = strinbuf.slice(0); // reset for next pass
      }
      if (t != k)
        // redo best mask - none good enough, last wasn't t
        applymask(t);
  
      // add in final mask/ecclevel bytes
      y = fmtword[t + ((ecclevel - 1) << 3)];
      // low byte
      for (k = 0; k < 8; k++ , y >>= 1)
        if (y & 1) {
          qrframe[width - 1 - k + width * 8] = 1;
          if (k < 6) qrframe[8 + width * k] = 1;
          else qrframe[8 + width * (k + 1)] = 1;
        }
      // high byte
      for (k = 0; k < 7; k++ , y >>= 1)
        if (y & 1) {
          qrframe[8 + width * (width - 7 + k)] = 1;
          if (k) qrframe[6 - k + width * 8] = 1;
          else qrframe[7 + width * 8] = 1;
        }
      return qrframe;
    }
  
    var _canvas = null;
  
    var api = {
      get ecclevel() {
        return ecclevel;
      },
  
      set ecclevel(val) {
        ecclevel = val;
      },
  
      get size() {
        return _size;
      },
  
      set size(val) {
        _size = val;
      },
  
      get canvas() {
        return _canvas;
      },
  
      set canvas(el) {
        _canvas = el;
      },
  
      getFrame: function (string) {
        return genframe(string);
      },
      //这里的utf16to8(str)是对Text中的字符串进行转码，让其支持中文
      utf16to8: function (str) {
        var out, i, len, c;
  
        out = '';
        len = str.length;
        for (i = 0; i < len; i++) {
          c = str.charCodeAt(i);
          if (c >= 0x0001 && c <= 0x007f) {
            out += str.charAt(i);
          } else if (c > 0x07ff) {
            out += String.fromCharCode(0xe0 | ((c >> 12) & 0x0f));
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3f));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f));
          } else {
            out += String.fromCharCode(0xc0 | ((c >> 6) & 0x1f));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f));
          }
        }
        return out;
      },
      /**
       * 新增$this参数，传入组件的this,兼容在组件中生成
       */
  
      draw: function (str, canvas, cavW, cavH, $this, ecc) {
        var that = this;
        ecclevel = ecc || ecclevel;
        canvas = canvas || _canvas;
        if (!canvas) {
          console.warn('No canvas provided to draw QR code in!');
          return;
        }
  
        var size = Math.min(cavW, cavH);
        str = that.utf16to8(str); //增加中文显示
  
        var frame = that.getFrame(str),
          // 组件中生成qrcode需要绑定this
          ctx = wx.createCanvasContext(canvas, $this),
          px = Math.round(size / (width + 8));
        var roundedSize = px * (width + 8),
          offset = Math.floor((size - roundedSize) / 2);
        size = roundedSize;
        //ctx.clearRect(0, 0, cavW, cavW);
        ctx.setFillStyle('#ffffff');
        ctx.fillRect(0, 0, cavW, cavW);
        ctx.setFillStyle('#000000');
        for (var i = 0; i < width; i++) {
          for (var j = 0; j < width; j++) {
            if (frame[j * width + i]) {
              ctx.fillRect(px * (4 + i) + offset, px * (4 + j) + offset, px, px);
            }
          }
        }
        ctx.draw();
      }
    };
    module.exports = { api };
    // exports.draw = api;
  })();
  