How to use IrreversibleTransform method in wpt

Best JavaScript code snippet using wpt

jpx.js

Source:jpx.js

...1273    var segmentationSymbolUsed = codingStyleParameters.segmentationSymbolUsed;1274    var precision = context.components[c].precision;1275    var reversible = codingStyleParameters.reversibleTransformation;1276    var transform = (reversible ? new ReversibleTransform() :1277                                  new IrreversibleTransform());1278    var subbandCoefficients = [];1279    var b = 0;1280    for (var i = 0; i <= decompositionLevelsCount; i++) {1281      var resolution = component.resolutions[i];1282      var width = resolution.trx1 - resolution.trx0;1283      var height = resolution.try1 - resolution.try0;1284      // Allocate space for the whole sublevel.1285      var coefficients = new Float32Array(width * height);1286      for (var j = 0, jj = resolution.subbands.length; j < jj; j++) {1287        var mu, epsilon;1288        if (!scalarExpounded) {1289          // formula E-51290          mu = spqcds[0].mu;1291          epsilon = spqcds[0].epsilon + (i > 0 ? 1 - i : 0);1292        } else {1293          mu = spqcds[b].mu;1294          epsilon = spqcds[b].epsilon;1295          b++;1296        }1297        var subband = resolution.subbands[j];1298        var gainLog2 = SubbandsGainLog2[subband.type];1299        // calulate quantization coefficient (Section E.1.1.1)1300        var delta = (reversible ? 1 :1301          Math.pow(2, precision + gainLog2 - epsilon) * (1 + mu / 2048));1302        var mb = (guardBits + epsilon - 1);1303        // In the first resolution level, copyCoefficients will fill the1304        // whole array with coefficients. In the succeding passes,1305        // copyCoefficients will consecutively fill in the values that belong1306        // to the interleaved positions of the HL, LH, and HH coefficients.1307        // The LL coefficients will then be interleaved in Transform.iterate().1308        copyCoefficients(coefficients, width, height, subband, delta, mb,1309                         reversible, segmentationSymbolUsed);1310      }1311      subbandCoefficients.push({1312        width: width,1313        height: height,1314        items: coefficients1315      });1316    }1317    var result = transform.calculate(subbandCoefficients,1318                                     component.tcx0, component.tcy0);1319    return {1320      left: component.tcx0,1321      top: component.tcy0,1322      width: result.width,1323      height: result.height,1324      items: result.items1325    };1326  }1327  function transformComponents(context) {1328    var siz = context.SIZ;1329    var components = context.components;1330    var componentsCount = siz.Csiz;1331    var resultImages = [];1332    for (var i = 0, ii = context.tiles.length; i < ii; i++) {1333      var tile = context.tiles[i];1334      var transformedTiles = [];1335      var c;1336      for (c = 0; c < componentsCount; c++) {1337        transformedTiles[c] = transformTile(context, tile, c);1338      }1339      var tile0 = transformedTiles[0];1340      var out = new Uint8Array(tile0.items.length * componentsCount);1341      var result = {1342        left: tile0.left,1343        top: tile0.top,1344        width: tile0.width,1345        height: tile0.height,1346        items: out1347      };1348      // Section G.2.2 Inverse multi component transform1349      var shift, offset, max, min, maxK;1350      var pos = 0, j, jj, y0, y1, y2, r, g, b, k, val;1351      if (tile.codingStyleDefaultParameters.multipleComponentTransform) {1352        var fourComponents = componentsCount === 4;1353        var y0items = transformedTiles[0].items;1354        var y1items = transformedTiles[1].items;1355        var y2items = transformedTiles[2].items;1356        var y3items = fourComponents ? transformedTiles[3].items : null;1357        // HACK: The multiple component transform formulas below assume that1358        // all components have the same precision. With this in mind, we1359        // compute shift and offset only once.1360        shift = components[0].precision - 8;1361        offset = (128 << shift) + 0.5;1362        max = 255 * (1 << shift);1363        maxK = max * 0.5;1364        min = -maxK;1365        var component0 = tile.components[0];1366        var alpha01 = componentsCount - 3;1367        jj = y0items.length;1368        if (!component0.codingStyleParameters.reversibleTransformation) {1369          // inverse irreversible multiple component transform1370          for (j = 0; j < jj; j++, pos += alpha01) {1371            y0 = y0items[j] + offset;1372            y1 = y1items[j];1373            y2 = y2items[j];1374            r = y0 + 1.402 * y2;1375            g = y0 - 0.34413 * y1 - 0.71414 * y2;1376            b = y0 + 1.772 * y1;1377            out[pos++] = r <= 0 ? 0 : r >= max ? 255 : r >> shift;1378            out[pos++] = g <= 0 ? 0 : g >= max ? 255 : g >> shift;1379            out[pos++] = b <= 0 ? 0 : b >= max ? 255 : b >> shift;1380          }1381        } else {1382          // inverse reversible multiple component transform1383          for (j = 0; j < jj; j++, pos += alpha01) {1384            y0 = y0items[j] + offset;1385            y1 = y1items[j];1386            y2 = y2items[j];1387            g = y0 - ((y2 + y1) >> 2);1388            r = g + y2;1389            b = g + y1;1390            out[pos++] = r <= 0 ? 0 : r >= max ? 255 : r >> shift;1391            out[pos++] = g <= 0 ? 0 : g >= max ? 255 : g >> shift;1392            out[pos++] = b <= 0 ? 0 : b >= max ? 255 : b >> shift;1393          }1394        }1395        if (fourComponents) {1396          for (j = 0, pos = 3; j < jj; j++, pos += 4) {1397            k = y3items[j];1398            out[pos] = k <= min ? 0 : k >= maxK ? 255 : (k + offset) >> shift;1399          }1400        }1401      } else { // no multi-component transform1402        for (c = 0; c < componentsCount; c++) {1403          var items = transformedTiles[c].items;1404          shift = components[c].precision - 8;1405          offset = (128 << shift) + 0.5;1406          max = (127.5 * (1 << shift));1407          min = -max;1408          for (pos = c, j = 0, jj = items.length; j < jj; j++) {1409            val = items[j];1410            out[pos] = val <= min ? 0 :1411                       val >= max ? 255 : (val + offset) >> shift;1412            pos += componentsCount;1413          }1414        }1415      }1416      resultImages.push(result);1417    }1418    return resultImages;1419  }1420  function initializeTile(context, tileIndex) {1421    var siz = context.SIZ;1422    var componentsCount = siz.Csiz;1423    var tile = context.tiles[tileIndex];1424    for (var c = 0; c < componentsCount; c++) {1425      var component = tile.components[c];1426      var qcdOrQcc = (context.currentTile.QCC[c] !== undefined ?1427        context.currentTile.QCC[c] : context.currentTile.QCD);1428      component.quantizationParameters = qcdOrQcc;1429      var codOrCoc = (context.currentTile.COC[c] !== undefined  ?1430        context.currentTile.COC[c] : context.currentTile.COD);1431      component.codingStyleParameters = codOrCoc;1432    }1433    tile.codingStyleDefaultParameters = context.currentTile.COD;1434  }1435  // Section B.10.2 Tag trees1436  var TagTree = (function TagTreeClosure() {1437    function TagTree(width, height) {1438      var levelsLength = log2(Math.max(width, height)) + 1;1439      this.levels = [];1440      for (var i = 0; i < levelsLength; i++) {1441        var level = {1442          width: width,1443          height: height,1444          items: []1445        };1446        this.levels.push(level);1447        width = Math.ceil(width / 2);1448        height = Math.ceil(height / 2);1449      }1450    }1451    TagTree.prototype = {1452      reset: function TagTree_reset(i, j) {1453        var currentLevel = 0, value = 0, level;1454        while (currentLevel < this.levels.length) {1455          level = this.levels[currentLevel];1456          var index = i + j * level.width;1457          if (level.items[index] !== undefined) {1458            value = level.items[index];1459            break;1460          }1461          level.index = index;1462          i >>= 1;1463          j >>= 1;1464          currentLevel++;1465        }1466        currentLevel--;1467        level = this.levels[currentLevel];1468        level.items[level.index] = value;1469        this.currentLevel = currentLevel;1470        delete this.value;1471      },1472      incrementValue: function TagTree_incrementValue() {1473        var level = this.levels[this.currentLevel];1474        level.items[level.index]++;1475      },1476      nextLevel: function TagTree_nextLevel() {1477        var currentLevel = this.currentLevel;1478        var level = this.levels[currentLevel];1479        var value = level.items[level.index];1480        currentLevel--;1481        if (currentLevel < 0) {1482          this.value = value;1483          return false;1484        }1485        this.currentLevel = currentLevel;1486        level = this.levels[currentLevel];1487        level.items[level.index] = value;1488        return true;1489      }1490    };1491    return TagTree;1492  })();1493  var InclusionTree = (function InclusionTreeClosure() {1494    function InclusionTree(width, height,  defaultValue) {1495      var levelsLength = log2(Math.max(width, height)) + 1;1496      this.levels = [];1497      for (var i = 0; i < levelsLength; i++) {1498        var items = new Uint8Array(width * height);1499        for (var j = 0, jj = items.length; j < jj; j++) {1500          items[j] = defaultValue;1501        }1502        var level = {1503          width: width,1504          height: height,1505          items: items1506        };1507        this.levels.push(level);1508        width = Math.ceil(width / 2);1509        height = Math.ceil(height / 2);1510      }1511    }1512    InclusionTree.prototype = {1513      reset: function InclusionTree_reset(i, j, stopValue) {1514        var currentLevel = 0;1515        while (currentLevel < this.levels.length) {1516          var level = this.levels[currentLevel];1517          var index = i + j * level.width;1518          level.index = index;1519          var value = level.items[index];1520          if (value === 0xFF) {1521            break;1522          }1523          if (value > stopValue) {1524            this.currentLevel = currentLevel;1525            // already know about this one, propagating the value to top levels1526            this.propagateValues();1527            return false;1528          }1529          i >>= 1;1530          j >>= 1;1531          currentLevel++;1532        }1533        this.currentLevel = currentLevel - 1;1534        return true;1535      },1536      incrementValue: function InclusionTree_incrementValue(stopValue) {1537        var level = this.levels[this.currentLevel];1538        level.items[level.index] = stopValue + 1;1539        this.propagateValues();1540      },1541      propagateValues: function InclusionTree_propagateValues() {1542        var levelIndex = this.currentLevel;1543        var level = this.levels[levelIndex];1544        var currentValue = level.items[level.index];1545        while (--levelIndex >= 0) {1546          level = this.levels[levelIndex];1547          level.items[level.index] = currentValue;1548        }1549      },1550      nextLevel: function InclusionTree_nextLevel() {1551        var currentLevel = this.currentLevel;1552        var level = this.levels[currentLevel];1553        var value = level.items[level.index];1554        level.items[level.index] = 0xFF;1555        currentLevel--;1556        if (currentLevel < 0) {1557          return false;1558        }1559        this.currentLevel = currentLevel;1560        level = this.levels[currentLevel];1561        level.items[level.index] = value;1562        return true;1563      }1564    };1565    return InclusionTree;1566  })();1567  // Section D. Coefficient bit modeling1568  var BitModel = (function BitModelClosure() {1569    var UNIFORM_CONTEXT = 17;1570    var RUNLENGTH_CONTEXT = 18;1571    // Table D-11572    // The index is binary presentation: 0dddvvhh, ddd - sum of Di (0..4),1573    // vv - sum of Vi (0..2), and hh - sum of Hi (0..2)1574    var LLAndLHContextsLabel = new Uint8Array([1575      0, 5, 8, 0, 3, 7, 8, 0, 4, 7, 8, 0, 0, 0, 0, 0, 1, 6, 8, 0, 3, 7, 8, 0, 4,1576      7, 8, 0, 0, 0, 0, 0, 2, 6, 8, 0, 3, 7, 8, 0, 4, 7, 8, 0, 0, 0, 0, 0, 2, 6,1577      8, 0, 3, 7, 8, 0, 4, 7, 8, 0, 0, 0, 0, 0, 2, 6, 8, 0, 3, 7, 8, 0, 4, 7, 81578    ]);1579    var HLContextLabel = new Uint8Array([1580      0, 3, 4, 0, 5, 7, 7, 0, 8, 8, 8, 0, 0, 0, 0, 0, 1, 3, 4, 0, 6, 7, 7, 0, 8,1581      8, 8, 0, 0, 0, 0, 0, 2, 3, 4, 0, 6, 7, 7, 0, 8, 8, 8, 0, 0, 0, 0, 0, 2, 3,1582      4, 0, 6, 7, 7, 0, 8, 8, 8, 0, 0, 0, 0, 0, 2, 3, 4, 0, 6, 7, 7, 0, 8, 8, 81583    ]);1584    var HHContextLabel = new Uint8Array([1585      0, 1, 2, 0, 1, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 0, 3, 4, 5, 0, 4, 5, 5, 0, 5,1586      5, 5, 0, 0, 0, 0, 0, 6, 7, 7, 0, 7, 7, 7, 0, 7, 7, 7, 0, 0, 0, 0, 0, 8, 8,1587      8, 0, 8, 8, 8, 0, 8, 8, 8, 0, 0, 0, 0, 0, 8, 8, 8, 0, 8, 8, 8, 0, 8, 8, 81588    ]);1589    function BitModel(width, height, subband, zeroBitPlanes, mb) {1590      this.width = width;1591      this.height = height;1592      this.contextLabelTable = (subband === 'HH' ? HHContextLabel :1593        (subband === 'HL' ? HLContextLabel : LLAndLHContextsLabel));1594      var coefficientCount = width * height;1595      // coefficients outside the encoding region treated as insignificant1596      // add border state cells for significanceState1597      this.neighborsSignificance = new Uint8Array(coefficientCount);1598      this.coefficentsSign = new Uint8Array(coefficientCount);1599      this.coefficentsMagnitude = mb > 14 ? new Uint32Array(coefficientCount) :1600                                  mb > 6 ? new Uint16Array(coefficientCount) :1601                                  new Uint8Array(coefficientCount);1602      this.processingFlags = new Uint8Array(coefficientCount);1603      var bitsDecoded = new Uint8Array(coefficientCount);1604      if (zeroBitPlanes !== 0) {1605        for (var i = 0; i < coefficientCount; i++) {1606          bitsDecoded[i] = zeroBitPlanes;1607        }1608      }1609      this.bitsDecoded = bitsDecoded;1610      this.reset();1611    }1612    BitModel.prototype = {1613      setDecoder: function BitModel_setDecoder(decoder) {1614        this.decoder = decoder;1615      },1616      reset: function BitModel_reset() {1617        // We have 17 contexts that are accessed via context labels,1618        // plus the uniform and runlength context.1619        this.contexts = new Int8Array(19);1620        // Contexts are packed into 1 byte:1621        // highest 7 bits carry the index, lowest bit carries mps1622        this.contexts[0] = (4 << 1) | 0;1623        this.contexts[UNIFORM_CONTEXT] = (46 << 1) | 0;1624        this.contexts[RUNLENGTH_CONTEXT] = (3 << 1) | 0;1625      },1626      setNeighborsSignificance:1627        function BitModel_setNeighborsSignificance(row, column, index) {1628        var neighborsSignificance = this.neighborsSignificance;1629        var width = this.width, height = this.height;1630        var left = (column > 0);1631        var right = (column + 1 < width);1632        var i;1633        if (row > 0) {1634          i = index - width;1635          if (left) {1636            neighborsSignificance[i - 1] += 0x10;1637          }1638          if (right) {1639            neighborsSignificance[i + 1] += 0x10;1640          }1641          neighborsSignificance[i] += 0x04;1642        }1643        if (row + 1 < height) {1644          i = index + width;1645          if (left) {1646            neighborsSignificance[i - 1] += 0x10;1647          }1648          if (right) {1649            neighborsSignificance[i + 1] += 0x10;1650          }1651          neighborsSignificance[i] += 0x04;1652        }1653        if (left) {1654          neighborsSignificance[index - 1] += 0x01;1655        }1656        if (right) {1657          neighborsSignificance[index + 1] += 0x01;1658        }1659        neighborsSignificance[index] |= 0x80;1660      },1661      runSignificancePropogationPass:1662        function BitModel_runSignificancePropogationPass() {1663        var decoder = this.decoder;1664        var width = this.width, height = this.height;1665        var coefficentsMagnitude = this.coefficentsMagnitude;1666        var coefficentsSign = this.coefficentsSign;1667        var neighborsSignificance = this.neighborsSignificance;1668        var processingFlags = this.processingFlags;1669        var contexts = this.contexts;1670        var labels = this.contextLabelTable;1671        var bitsDecoded = this.bitsDecoded;1672        var processedInverseMask = ~1;1673        var processedMask = 1;1674        var firstMagnitudeBitMask = 2;1675        for (var i0 = 0; i0 < height; i0 += 4) {1676          for (var j = 0; j < width; j++) {1677            var index = i0 * width + j;1678            for (var i1 = 0; i1 < 4; i1++, index += width) {1679              var i = i0 + i1;1680              if (i >= height) {1681                break;1682              }1683              // clear processed flag first1684              processingFlags[index] &= processedInverseMask;1685              if (coefficentsMagnitude[index] ||1686                  !neighborsSignificance[index]) {1687                continue;1688              }1689              var contextLabel = labels[neighborsSignificance[index]];1690              var decision = decoder.readBit(contexts, contextLabel);1691              if (decision) {1692                var sign = this.decodeSignBit(i, j, index);1693                coefficentsSign[index] = sign;1694                coefficentsMagnitude[index] = 1;1695                this.setNeighborsSignificance(i, j, index);1696                processingFlags[index] |= firstMagnitudeBitMask;1697              }1698              bitsDecoded[index]++;1699              processingFlags[index] |= processedMask;1700            }1701          }1702        }1703      },1704      decodeSignBit: function BitModel_decodeSignBit(row, column, index) {1705        var width = this.width, height = this.height;1706        var coefficentsMagnitude = this.coefficentsMagnitude;1707        var coefficentsSign = this.coefficentsSign;1708        var contribution, sign0, sign1, significance1;1709        var contextLabel, decoded;1710        // calculate horizontal contribution1711        significance1 = (column > 0 && coefficentsMagnitude[index - 1] !== 0);1712        if (column + 1 < width && coefficentsMagnitude[index + 1] !== 0) {1713          sign1 = coefficentsSign[index + 1];1714          if (significance1) {1715            sign0 = coefficentsSign[index - 1];1716            contribution = 1 - sign1 - sign0;1717          } else {1718            contribution = 1 - sign1 - sign1;1719          }1720        } else if (significance1) {1721          sign0 = coefficentsSign[index - 1];1722          contribution = 1 - sign0 - sign0;1723        } else {1724          contribution = 0;1725        }1726        var horizontalContribution = 3 * contribution;1727        // calculate vertical contribution and combine with the horizontal1728        significance1 = (row > 0 && coefficentsMagnitude[index - width] !== 0);1729        if (row + 1 < height && coefficentsMagnitude[index + width] !== 0) {1730          sign1 = coefficentsSign[index + width];1731          if (significance1) {1732            sign0 = coefficentsSign[index - width];1733            contribution = 1 - sign1 - sign0 + horizontalContribution;1734          } else {1735            contribution = 1 - sign1 - sign1 + horizontalContribution;1736          }1737        } else if (significance1) {1738          sign0 = coefficentsSign[index - width];1739          contribution = 1 - sign0 - sign0 + horizontalContribution;1740        } else {1741          contribution = horizontalContribution;1742        }1743        if (contribution >= 0) {1744          contextLabel = 9 + contribution;1745          decoded = this.decoder.readBit(this.contexts, contextLabel);1746        } else {1747          contextLabel = 9 - contribution;1748          decoded = this.decoder.readBit(this.contexts, contextLabel) ^ 1;1749        }1750        return decoded;1751      },1752      runMagnitudeRefinementPass:1753        function BitModel_runMagnitudeRefinementPass() {1754        var decoder = this.decoder;1755        var width = this.width, height = this.height;1756        var coefficentsMagnitude = this.coefficentsMagnitude;1757        var neighborsSignificance = this.neighborsSignificance;1758        var contexts = this.contexts;1759        var bitsDecoded = this.bitsDecoded;1760        var processingFlags = this.processingFlags;1761        var processedMask = 1;1762        var firstMagnitudeBitMask = 2;1763        var length = width * height;1764        var width4 = width * 4;1765        for (var index0 = 0, indexNext; index0 < length; index0 = indexNext) {1766          indexNext = Math.min(length, index0 + width4);1767          for (var j = 0; j < width; j++) {1768            for (var index = index0 + j; index < indexNext; index += width) {1769              // significant but not those that have just become1770              if (!coefficentsMagnitude[index] ||1771                (processingFlags[index] & processedMask) !== 0) {1772                continue;1773              }1774              var contextLabel = 16;1775              if ((processingFlags[index] & firstMagnitudeBitMask) !== 0) {1776                processingFlags[index] ^= firstMagnitudeBitMask;1777                // first refinement1778               var significance = neighborsSignificance[index] & 127;1779               contextLabel = significance === 0 ? 15 : 14;1780              }1781              var bit = decoder.readBit(contexts, contextLabel);1782              coefficentsMagnitude[index] =1783                (coefficentsMagnitude[index] << 1) | bit;1784              bitsDecoded[index]++;1785              processingFlags[index] |= processedMask;1786            }1787          }1788        }1789      },1790      runCleanupPass: function BitModel_runCleanupPass() {1791        var decoder = this.decoder;1792        var width = this.width, height = this.height;1793        var neighborsSignificance = this.neighborsSignificance;1794        var coefficentsMagnitude = this.coefficentsMagnitude;1795        var coefficentsSign = this.coefficentsSign;1796        var contexts = this.contexts;1797        var labels = this.contextLabelTable;1798        var bitsDecoded = this.bitsDecoded;1799        var processingFlags = this.processingFlags;1800        var processedMask = 1;1801        var firstMagnitudeBitMask = 2;1802        var oneRowDown = width;1803        var twoRowsDown = width * 2;1804        var threeRowsDown = width * 3;1805        var iNext;1806        for (var i0 = 0; i0 < height; i0 = iNext) {1807          iNext = Math.min(i0 + 4, height);1808          var indexBase = i0 * width;1809          var checkAllEmpty = i0 + 3 < height;1810          for (var j = 0; j < width; j++) {1811            var index0 = indexBase + j;1812            // using the property: labels[neighborsSignificance[index]] === 01813            // when neighborsSignificance[index] === 01814            var allEmpty = (checkAllEmpty &&1815              processingFlags[index0] === 0 &&1816              processingFlags[index0 + oneRowDown] === 0 &&1817              processingFlags[index0 + twoRowsDown] === 0 &&1818              processingFlags[index0 + threeRowsDown] === 0 &&1819              neighborsSignificance[index0] === 0 &&1820              neighborsSignificance[index0 + oneRowDown] === 0 &&1821              neighborsSignificance[index0 + twoRowsDown] === 0 &&1822              neighborsSignificance[index0 + threeRowsDown] === 0);1823            var i1 = 0, index = index0;1824            var i = i0, sign;1825            if (allEmpty) {1826              var hasSignificantCoefficent =1827                decoder.readBit(contexts, RUNLENGTH_CONTEXT);1828              if (!hasSignificantCoefficent) {1829                bitsDecoded[index0]++;1830                bitsDecoded[index0 + oneRowDown]++;1831                bitsDecoded[index0 + twoRowsDown]++;1832                bitsDecoded[index0 + threeRowsDown]++;1833                continue; // next column1834              }1835              i1 = (decoder.readBit(contexts, UNIFORM_CONTEXT) << 1) |1836                    decoder.readBit(contexts, UNIFORM_CONTEXT);1837              if (i1 !== 0) {1838                i = i0 + i1;1839                index += i1 * width;1840              }1841              sign = this.decodeSignBit(i, j, index);1842              coefficentsSign[index] = sign;1843              coefficentsMagnitude[index] = 1;1844              this.setNeighborsSignificance(i, j, index);1845              processingFlags[index] |= firstMagnitudeBitMask;1846              index = index0;1847              for (var i2 = i0; i2 <= i; i2++, index += width) {1848                bitsDecoded[index]++;1849              }1850              i1++;1851            }1852            for (i = i0 + i1; i < iNext; i++, index += width) {1853              if (coefficentsMagnitude[index] ||1854                (processingFlags[index] & processedMask) !== 0) {1855                continue;1856              }1857              var contextLabel = labels[neighborsSignificance[index]];1858              var decision = decoder.readBit(contexts, contextLabel);1859              if (decision === 1) {1860                sign = this.decodeSignBit(i, j, index);1861                coefficentsSign[index] = sign;1862                coefficentsMagnitude[index] = 1;1863                this.setNeighborsSignificance(i, j, index);1864                processingFlags[index] |= firstMagnitudeBitMask;1865              }1866              bitsDecoded[index]++;1867            }1868          }1869        }1870      },1871      checkSegmentationSymbol: function BitModel_checkSegmentationSymbol() {1872        var decoder = this.decoder;1873        var contexts = this.contexts;1874        var symbol = (decoder.readBit(contexts, UNIFORM_CONTEXT) << 3) |1875                     (decoder.readBit(contexts, UNIFORM_CONTEXT) << 2) |1876                     (decoder.readBit(contexts, UNIFORM_CONTEXT) << 1) |1877                      decoder.readBit(contexts, UNIFORM_CONTEXT);1878        if (symbol !== 0xA) {1879          throw new Error('JPX Error: Invalid segmentation symbol');1880        }1881      }1882    };1883    return BitModel;1884  })();1885  // Section F, Discrete wavelet transformation1886  var Transform = (function TransformClosure() {1887    function Transform() {}1888    Transform.prototype.calculate =1889      function transformCalculate(subbands, u0, v0) {1890      var ll = subbands[0];1891      for (var i = 1, ii = subbands.length; i < ii; i++) {1892        ll = this.iterate(ll, subbands[i], u0, v0);1893      }1894      return ll;1895    };1896    Transform.prototype.extend = function extend(buffer, offset, size) {1897      // Section F.3.7 extending... using max extension of 41898      var i1 = offset - 1, j1 = offset + 1;1899      var i2 = offset + size - 2, j2 = offset + size;1900      buffer[i1--] = buffer[j1++];1901      buffer[j2++] = buffer[i2--];1902      buffer[i1--] = buffer[j1++];1903      buffer[j2++] = buffer[i2--];1904      buffer[i1--] = buffer[j1++];1905      buffer[j2++] = buffer[i2--];1906      buffer[i1] = buffer[j1];1907      buffer[j2] = buffer[i2];1908    };1909    Transform.prototype.iterate = function Transform_iterate(ll, hl_lh_hh,1910                                                             u0, v0) {1911      var llWidth = ll.width, llHeight = ll.height, llItems = ll.items;1912      var width = hl_lh_hh.width;1913      var height = hl_lh_hh.height;1914      var items = hl_lh_hh.items;1915      var i, j, k, l, u, v;1916      // Interleave LL according to Section F.3.31917      for (k = 0, i = 0; i < llHeight; i++) {1918        l = i * 2 * width;1919        for (j = 0; j < llWidth; j++, k++, l += 2) {1920          items[l] = llItems[k];1921        }1922      }1923      // The LL band is not needed anymore.1924      llItems = ll.items = null;1925      var bufferPadding = 4;1926      var rowBuffer = new Float32Array(width + 2 * bufferPadding);1927      // Section F.3.4 HOR_SR1928      if (width === 1) {1929        // if width = 1, when u0 even keep items as is, when odd divide by 21930        if ((u0 & 1) !== 0) {1931          for (v = 0, k = 0; v < height; v++, k += width) {1932            items[k] *= 0.5;1933          }1934        }1935      } else {1936        for (v = 0, k = 0; v < height; v++, k += width) {1937          rowBuffer.set(items.subarray(k, k + width), bufferPadding);1938          this.extend(rowBuffer, bufferPadding, width);1939          this.filter(rowBuffer, bufferPadding, width);1940          items.set(1941            rowBuffer.subarray(bufferPadding, bufferPadding + width),1942            k);1943        }1944      }1945      // Accesses to the items array can take long, because it may not fit into1946      // CPU cache and has to be fetched from main memory. Since subsequent1947      // accesses to the items array are not local when reading columns, we1948      // have a cache miss every time. To reduce cache misses, get up to1949      // 'numBuffers' items at a time and store them into the individual1950      // buffers. The colBuffers should be small enough to fit into CPU cache.1951      var numBuffers = 16;1952      var colBuffers = [];1953      for (i = 0; i < numBuffers; i++) {1954        colBuffers.push(new Float32Array(height + 2 * bufferPadding));1955      }1956      var b, currentBuffer = 0;1957      ll = bufferPadding + height;1958      // Section F.3.5 VER_SR1959      if (height === 1) {1960          // if height = 1, when v0 even keep items as is, when odd divide by 21961        if ((v0 & 1) !== 0) {1962          for (u = 0; u < width; u++) {1963            items[u] *= 0.5;1964          }1965        }1966      } else {1967        for (u = 0; u < width; u++) {1968          // if we ran out of buffers, copy several image columns at once1969          if (currentBuffer === 0) {1970            numBuffers = Math.min(width - u, numBuffers);1971            for (k = u, l = bufferPadding; l < ll; k += width, l++) {1972              for (b = 0; b < numBuffers; b++) {1973                colBuffers[b][l] = items[k + b];1974              }1975            }1976            currentBuffer = numBuffers;1977          }1978          currentBuffer--;1979          var buffer = colBuffers[currentBuffer];1980          this.extend(buffer, bufferPadding, height);1981          this.filter(buffer, bufferPadding, height);1982          // If this is last buffer in this group of buffers, flush all buffers.1983          if (currentBuffer === 0) {1984            k = u - numBuffers + 1;1985            for (l = bufferPadding; l < ll; k += width, l++) {1986              for (b = 0; b < numBuffers; b++) {1987                items[k + b] = colBuffers[b][l];1988              }1989            }1990          }1991        }1992      }1993      return {1994        width: width,1995        height: height,1996        items: items1997      };1998    };1999    return Transform;2000  })();2001  // Section 3.8.2 Irreversible 9-7 filter2002  var IrreversibleTransform = (function IrreversibleTransformClosure() {2003    function IrreversibleTransform() {2004      Transform.call(this);2005    }2006    IrreversibleTransform.prototype = Object.create(Transform.prototype);2007    IrreversibleTransform.prototype.filter =2008      function irreversibleTransformFilter(x, offset, length) {2009      var len = length >> 1;2010      offset = offset | 0;2011      var j, n, current, next;2012      var alpha = -1.586134342059924;2013      var beta = -0.052980118572961;2014      var gamma = 0.882911075530934;2015      var delta = 0.443506852043971;2016      var K = 1.230174104914001;2017      var K_ = 1 / K;...

Using AI Code Generation

1var wptools = require('wptools');2var page = wptools.page('Barack Obama');3page.get(function(err, info) {4  if (err) {5    console.log(err);6  } else {7    console.log(info);8  }9});10var wptools = require('wptools');11var page = wptools.page('Barack Obama');12page.get(function(err, info) {13  if (err) {14    console.log(err);15  } else {16    console.log(info);17  }18});19var wptools = require('wptools');20var page = wptools.page('Barack Obama');21page.get(function(err, info) {22  if (err) {23    console.log(err);24  } else {25    console.log(info);26  }27});28var wptools = require('wptools');29var page = wptools.page('Barack Obama');30page.get(function(err, info) {31  if (err) {32    console.log(err);33  } else {34    console.log(info);35  }36});37var wptools = require('wptools');38var page = wptools.page('Barack Obama');39page.get(function(err, info) {40  if (err) {41    console.log(err);42  } else {43    console.log(info);44  }45});46var wptools = require('wptools');47var page = wptools.page('Barack Obama');48page.get(function(err, info) {49  if (err) {50    console.log(err);51  } else {52    console.log(info);53  }54});55var wptools = require('wptools');56var page = wptools.page('Barack Obama');57page.get(function(err, info) {58  if (err) {59    console.log(err);60  } else {61    console.log(info);62  }

Using AI Code Generation

1var wpt = require('webpagetest');2var options = {3};4var webpagetest = new wpt(options);5var data = {6 videoParams: {

Using AI Code Generation

1var wptools = require('wptools');2var page = wptools.page('Barack Obama');3page.get(function(err, resp) {4    console.log(resp);5});6var wptools = require('wptools');7var page = wptools.page('Barack Obama');8page.get(function(err, resp) {9    console.log(resp);10});

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var async = require('async');4var articles = fs.readFileSync('articles.txt', 'utf8').split('\n');5articles.pop();6var results = {};7async.eachSeries(articles, function(article, callback) {8    .page(article)9    .lang('en')10    .irreversibleTransform(function(err, resp) {11      if (err) {12        console.log(err);13      } else {14        results[article] = resp;15        console.log('done with ' + article);16      }17      callback();18    });19}, function(err) {20  if (err) {21    console.log(err);22  } else {23    fs.writeFile('results.json', JSON.stringify(results), function(err) {24      if (err) {25        console.log(err);26      } else {27        console.log('done');28      }29    });30  }31});32The_Beatles_discography_(1962%E2%80%931964)33The_Beatles_discography_(1967%E2%80%931969)34The_Beatles_discography_(1969%E2%80%931971)35The_Beatles_discography_(1972%E2%80%931974)36The_Beatles_discography_(1975%E2%80%931977)37The_Beatles_discography_(1978%E2%80

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var data = fs.readFileSync('Wikipedia-List-of-States-and-Territories-of-the-United-States.txt', 'utf8');4var array = data.split("\n");5var stream = fs.createWriteStream("output.txt");6stream.once('open', function(fd) {7  for (var i = 0; i < array.length; i++) {8    wptools.page(array[i]).get(function(err, resp) {9      var lat = resp.coordinates.lat;10      var long = resp.coordinates.lon;11      stream.write(array[i] + " " + lat + " " + long + "\n");12      console.log(array[i] + " " + lat + " " + long + "\n");13    });14  }15  stream.end();16});

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.