How to use JpxError method in wpt

Best JavaScript code snippet using wpt

jpx.js

Source:jpx.js

...26exports.JpxImage = undefined;27var _util = require('../shared/util');28var _arithmetic_decoder = require('./arithmetic_decoder');29var JpxError = function JpxErrorClosure() {30  function JpxError(msg) {31    this.message = 'JPX error: ' + msg;32  }33  JpxError.prototype = new Error();34  JpxError.prototype.name = 'JpxError';35  JpxError.constructor = JpxError;36  return JpxError;37}();38var JpxImage = function JpxImageClosure() {39  var SubbandsGainLog2 = {40    'LL': 0,41    'LH': 1,42    'HL': 1,43    'HH': 244  };45  function JpxImage() {46    this.failOnCorruptedImage = false;47  }48  JpxImage.prototype = {49    parse: function JpxImage_parse(data) {50      var head = (0, _util.readUint16)(data, 0);51      if (head === 0xFF4F) {52        this.parseCodestream(data, 0, data.length);53        return;54      }55      var position = 0,56          length = data.length;57      while (position < length) {58        var headerSize = 8;59        var lbox = (0, _util.readUint32)(data, position);60        var tbox = (0, _util.readUint32)(data, position + 4);61        position += headerSize;62        if (lbox === 1) {63          lbox = (0, _util.readUint32)(data, position) * 4294967296 + (0, _util.readUint32)(data, position + 4);64          position += 8;65          headerSize += 8;66        }67        if (lbox === 0) {68          lbox = length - position + headerSize;69        }70        if (lbox < headerSize) {71          throw new JpxError('Invalid box field size');72        }73        var dataLength = lbox - headerSize;74        var jumpDataLength = true;75        switch (tbox) {76          case 0x6A703268:77            jumpDataLength = false;78            break;79          case 0x636F6C72:80            var method = data[position];81            if (method === 1) {82              var colorspace = (0, _util.readUint32)(data, position + 3);83              switch (colorspace) {84                case 16:85                case 17:86                case 18:87                  break;88                default:89                  (0, _util.warn)('Unknown colorspace ' + colorspace);90                  break;91              }92            } else if (method === 2) {93              (0, _util.info)('ICC profile not supported');94            }95            break;96          case 0x6A703263:97            this.parseCodestream(data, position, position + dataLength);98            break;99          case 0x6A502020:100            if ((0, _util.readUint32)(data, position) !== 0x0d0a870a) {101              (0, _util.warn)('Invalid JP2 signature');102            }103            break;104          case 0x6A501A1A:105          case 0x66747970:106          case 0x72726571:107          case 0x72657320:108          case 0x69686472:109            break;110          default:111            var headerType = String.fromCharCode(tbox >> 24 & 0xFF, tbox >> 16 & 0xFF, tbox >> 8 & 0xFF, tbox & 0xFF);112            (0, _util.warn)('Unsupported header type ' + tbox + ' (' + headerType + ')');113            break;114        }115        if (jumpDataLength) {116          position += dataLength;117        }118      }119    },120    parseImageProperties: function JpxImage_parseImageProperties(stream) {121      var newByte = stream.getByte();122      while (newByte >= 0) {123        var oldByte = newByte;124        newByte = stream.getByte();125        var code = oldByte << 8 | newByte;126        if (code === 0xFF51) {127          stream.skip(4);128          var Xsiz = stream.getInt32() >>> 0;129          var Ysiz = stream.getInt32() >>> 0;130          var XOsiz = stream.getInt32() >>> 0;131          var YOsiz = stream.getInt32() >>> 0;132          stream.skip(16);133          var Csiz = stream.getUint16();134          this.width = Xsiz - XOsiz;135          this.height = Ysiz - YOsiz;136          this.componentsCount = Csiz;137          this.bitsPerComponent = 8;138          return;139        }140      }141      throw new JpxError('No size marker found in JPX stream');142    },143    parseCodestream: function JpxImage_parseCodestream(data, start, end) {144      var context = {};145      var doNotRecover = false;146      try {147        var position = start;148        while (position + 1 < end) {149          var code = (0, _util.readUint16)(data, position);150          position += 2;151          var length = 0,152              j,153              sqcd,154              spqcds,155              spqcdSize,156              scalarExpounded,157              tile;158          switch (code) {159            case 0xFF4F:160              context.mainHeader = true;161              break;162            case 0xFFD9:163              break;164            case 0xFF51:165              length = (0, _util.readUint16)(data, position);166              var siz = {};167              siz.Xsiz = (0, _util.readUint32)(data, position + 4);168              siz.Ysiz = (0, _util.readUint32)(data, position + 8);169              siz.XOsiz = (0, _util.readUint32)(data, position + 12);170              siz.YOsiz = (0, _util.readUint32)(data, position + 16);171              siz.XTsiz = (0, _util.readUint32)(data, position + 20);172              siz.YTsiz = (0, _util.readUint32)(data, position + 24);173              siz.XTOsiz = (0, _util.readUint32)(data, position + 28);174              siz.YTOsiz = (0, _util.readUint32)(data, position + 32);175              var componentsCount = (0, _util.readUint16)(data, position + 36);176              siz.Csiz = componentsCount;177              var components = [];178              j = position + 38;179              for (var i = 0; i < componentsCount; i++) {180                var component = {181                  precision: (data[j] & 0x7F) + 1,182                  isSigned: !!(data[j] & 0x80),183                  XRsiz: data[j + 1],184                  YRsiz: data[j + 2]185                };186                j += 3;187                calculateComponentDimensions(component, siz);188                components.push(component);189              }190              context.SIZ = siz;191              context.components = components;192              calculateTileGrids(context, components);193              context.QCC = [];194              context.COC = [];195              break;196            case 0xFF5C:197              length = (0, _util.readUint16)(data, position);198              var qcd = {};199              j = position + 2;200              sqcd = data[j++];201              switch (sqcd & 0x1F) {202                case 0:203                  spqcdSize = 8;204                  scalarExpounded = true;205                  break;206                case 1:207                  spqcdSize = 16;208                  scalarExpounded = false;209                  break;210                case 2:211                  spqcdSize = 16;212                  scalarExpounded = true;213                  break;214                default:215                  throw new Error('Invalid SQcd value ' + sqcd);216              }217              qcd.noQuantization = spqcdSize === 8;218              qcd.scalarExpounded = scalarExpounded;219              qcd.guardBits = sqcd >> 5;220              spqcds = [];221              while (j < length + position) {222                var spqcd = {};223                if (spqcdSize === 8) {224                  spqcd.epsilon = data[j++] >> 3;225                  spqcd.mu = 0;226                } else {227                  spqcd.epsilon = data[j] >> 3;228                  spqcd.mu = (data[j] & 0x7) << 8 | data[j + 1];229                  j += 2;230                }231                spqcds.push(spqcd);232              }233              qcd.SPqcds = spqcds;234              if (context.mainHeader) {235                context.QCD = qcd;236              } else {237                context.currentTile.QCD = qcd;238                context.currentTile.QCC = [];239              }240              break;241            case 0xFF5D:242              length = (0, _util.readUint16)(data, position);243              var qcc = {};244              j = position + 2;245              var cqcc;246              if (context.SIZ.Csiz < 257) {247                cqcc = data[j++];248              } else {249                cqcc = (0, _util.readUint16)(data, j);250                j += 2;251              }252              sqcd = data[j++];253              switch (sqcd & 0x1F) {254                case 0:255                  spqcdSize = 8;256                  scalarExpounded = true;257                  break;258                case 1:259                  spqcdSize = 16;260                  scalarExpounded = false;261                  break;262                case 2:263                  spqcdSize = 16;264                  scalarExpounded = true;265                  break;266                default:267                  throw new Error('Invalid SQcd value ' + sqcd);268              }269              qcc.noQuantization = spqcdSize === 8;270              qcc.scalarExpounded = scalarExpounded;271              qcc.guardBits = sqcd >> 5;272              spqcds = [];273              while (j < length + position) {274                spqcd = {};275                if (spqcdSize === 8) {276                  spqcd.epsilon = data[j++] >> 3;277                  spqcd.mu = 0;278                } else {279                  spqcd.epsilon = data[j] >> 3;280                  spqcd.mu = (data[j] & 0x7) << 8 | data[j + 1];281                  j += 2;282                }283                spqcds.push(spqcd);284              }285              qcc.SPqcds = spqcds;286              if (context.mainHeader) {287                context.QCC[cqcc] = qcc;288              } else {289                context.currentTile.QCC[cqcc] = qcc;290              }291              break;292            case 0xFF52:293              length = (0, _util.readUint16)(data, position);294              var cod = {};295              j = position + 2;296              var scod = data[j++];297              cod.entropyCoderWithCustomPrecincts = !!(scod & 1);298              cod.sopMarkerUsed = !!(scod & 2);299              cod.ephMarkerUsed = !!(scod & 4);300              cod.progressionOrder = data[j++];301              cod.layersCount = (0, _util.readUint16)(data, j);302              j += 2;303              cod.multipleComponentTransform = data[j++];304              cod.decompositionLevelsCount = data[j++];305              cod.xcb = (data[j++] & 0xF) + 2;306              cod.ycb = (data[j++] & 0xF) + 2;307              var blockStyle = data[j++];308              cod.selectiveArithmeticCodingBypass = !!(blockStyle & 1);309              cod.resetContextProbabilities = !!(blockStyle & 2);310              cod.terminationOnEachCodingPass = !!(blockStyle & 4);311              cod.verticalyStripe = !!(blockStyle & 8);312              cod.predictableTermination = !!(blockStyle & 16);313              cod.segmentationSymbolUsed = !!(blockStyle & 32);314              cod.reversibleTransformation = data[j++];315              if (cod.entropyCoderWithCustomPrecincts) {316                var precinctsSizes = [];317                while (j < length + position) {318                  var precinctsSize = data[j++];319                  precinctsSizes.push({320                    PPx: precinctsSize & 0xF,321                    PPy: precinctsSize >> 4322                  });323                }324                cod.precinctsSizes = precinctsSizes;325              }326              var unsupported = [];327              if (cod.selectiveArithmeticCodingBypass) {328                unsupported.push('selectiveArithmeticCodingBypass');329              }330              if (cod.resetContextProbabilities) {331                unsupported.push('resetContextProbabilities');332              }333              if (cod.terminationOnEachCodingPass) {334                unsupported.push('terminationOnEachCodingPass');335              }336              if (cod.verticalyStripe) {337                unsupported.push('verticalyStripe');338              }339              if (cod.predictableTermination) {340                unsupported.push('predictableTermination');341              }342              if (unsupported.length > 0) {343                doNotRecover = true;344                throw new Error('Unsupported COD options (' + unsupported.join(', ') + ')');345              }346              if (context.mainHeader) {347                context.COD = cod;348              } else {349                context.currentTile.COD = cod;350                context.currentTile.COC = [];351              }352              break;353            case 0xFF90:354              length = (0, _util.readUint16)(data, position);355              tile = {};356              tile.index = (0, _util.readUint16)(data, position + 2);357              tile.length = (0, _util.readUint32)(data, position + 4);358              tile.dataEnd = tile.length + position - 2;359              tile.partIndex = data[position + 8];360              tile.partsCount = data[position + 9];361              context.mainHeader = false;362              if (tile.partIndex === 0) {363                tile.COD = context.COD;364                tile.COC = context.COC.slice(0);365                tile.QCD = context.QCD;366                tile.QCC = context.QCC.slice(0);367              }368              context.currentTile = tile;369              break;370            case 0xFF93:371              tile = context.currentTile;372              if (tile.partIndex === 0) {373                initializeTile(context, tile.index);374                buildPackets(context);375              }376              length = tile.dataEnd - position;377              parseTilePackets(context, data, position, length);378              break;379            case 0xFF55:380            case 0xFF57:381            case 0xFF58:382            case 0xFF64:383              length = (0, _util.readUint16)(data, position);384              break;385            case 0xFF53:386              throw new Error('Codestream code 0xFF53 (COC) is ' + 'not implemented');387            default:388              throw new Error('Unknown codestream code: ' + code.toString(16));389          }390          position += length;391        }392      } catch (e) {393        if (doNotRecover || this.failOnCorruptedImage) {394          throw new JpxError(e.message);395        } else {396          (0, _util.warn)('JPX: Trying to recover from: ' + e.message);397        }398      }399      this.tiles = transformComponents(context);400      this.width = context.SIZ.Xsiz - context.SIZ.XOsiz;401      this.height = context.SIZ.Ysiz - context.SIZ.YOsiz;402      this.componentsCount = context.SIZ.Csiz;403    }404  };405  function calculateComponentDimensions(component, siz) {406    component.x0 = Math.ceil(siz.XOsiz / component.XRsiz);407    component.x1 = Math.ceil(siz.Xsiz / component.XRsiz);408    component.y0 = Math.ceil(siz.YOsiz / component.YRsiz);409    component.y1 = Math.ceil(siz.Ysiz / component.YRsiz);410    component.width = component.x1 - component.x0;411    component.height = component.y1 - component.y0;412  }413  function calculateTileGrids(context, components) {414    var siz = context.SIZ;415    var tile,416        tiles = [];417    var numXtiles = Math.ceil((siz.Xsiz - siz.XTOsiz) / siz.XTsiz);418    var numYtiles = Math.ceil((siz.Ysiz - siz.YTOsiz) / siz.YTsiz);419    for (var q = 0; q < numYtiles; q++) {420      for (var p = 0; p < numXtiles; p++) {421        tile = {};422        tile.tx0 = Math.max(siz.XTOsiz + p * siz.XTsiz, siz.XOsiz);423        tile.ty0 = Math.max(siz.YTOsiz + q * siz.YTsiz, siz.YOsiz);424        tile.tx1 = Math.min(siz.XTOsiz + (p + 1) * siz.XTsiz, siz.Xsiz);425        tile.ty1 = Math.min(siz.YTOsiz + (q + 1) * siz.YTsiz, siz.Ysiz);426        tile.width = tile.tx1 - tile.tx0;427        tile.height = tile.ty1 - tile.ty0;428        tile.components = [];429        tiles.push(tile);430      }431    }432    context.tiles = tiles;433    var componentsCount = siz.Csiz;434    for (var i = 0, ii = componentsCount; i < ii; i++) {435      var component = components[i];436      for (var j = 0, jj = tiles.length; j < jj; j++) {437        var tileComponent = {};438        tile = tiles[j];439        tileComponent.tcx0 = Math.ceil(tile.tx0 / component.XRsiz);440        tileComponent.tcy0 = Math.ceil(tile.ty0 / component.YRsiz);441        tileComponent.tcx1 = Math.ceil(tile.tx1 / component.XRsiz);442        tileComponent.tcy1 = Math.ceil(tile.ty1 / component.YRsiz);443        tileComponent.width = tileComponent.tcx1 - tileComponent.tcx0;444        tileComponent.height = tileComponent.tcy1 - tileComponent.tcy0;445        tile.components[i] = tileComponent;446      }447    }448  }449  function getBlocksDimensions(context, component, r) {450    var codOrCoc = component.codingStyleParameters;451    var result = {};452    if (!codOrCoc.entropyCoderWithCustomPrecincts) {453      result.PPx = 15;454      result.PPy = 15;455    } else {456      result.PPx = codOrCoc.precinctsSizes[r].PPx;457      result.PPy = codOrCoc.precinctsSizes[r].PPy;458    }459    result.xcb_ = r > 0 ? Math.min(codOrCoc.xcb, result.PPx - 1) : Math.min(codOrCoc.xcb, result.PPx);460    result.ycb_ = r > 0 ? Math.min(codOrCoc.ycb, result.PPy - 1) : Math.min(codOrCoc.ycb, result.PPy);461    return result;462  }463  function buildPrecincts(context, resolution, dimensions) {464    var precinctWidth = 1 << dimensions.PPx;465    var precinctHeight = 1 << dimensions.PPy;466    var isZeroRes = resolution.resLevel === 0;467    var precinctWidthInSubband = 1 << dimensions.PPx + (isZeroRes ? 0 : -1);468    var precinctHeightInSubband = 1 << dimensions.PPy + (isZeroRes ? 0 : -1);469    var numprecinctswide = resolution.trx1 > resolution.trx0 ? Math.ceil(resolution.trx1 / precinctWidth) - Math.floor(resolution.trx0 / precinctWidth) : 0;470    var numprecinctshigh = resolution.try1 > resolution.try0 ? Math.ceil(resolution.try1 / precinctHeight) - Math.floor(resolution.try0 / precinctHeight) : 0;471    var numprecincts = numprecinctswide * numprecinctshigh;472    resolution.precinctParameters = {473      precinctWidth: precinctWidth,474      precinctHeight: precinctHeight,475      numprecinctswide: numprecinctswide,476      numprecinctshigh: numprecinctshigh,477      numprecincts: numprecincts,478      precinctWidthInSubband: precinctWidthInSubband,479      precinctHeightInSubband: precinctHeightInSubband480    };481  }482  function buildCodeblocks(context, subband, dimensions) {483    var xcb_ = dimensions.xcb_;484    var ycb_ = dimensions.ycb_;485    var codeblockWidth = 1 << xcb_;486    var codeblockHeight = 1 << ycb_;487    var cbx0 = subband.tbx0 >> xcb_;488    var cby0 = subband.tby0 >> ycb_;489    var cbx1 = subband.tbx1 + codeblockWidth - 1 >> xcb_;490    var cby1 = subband.tby1 + codeblockHeight - 1 >> ycb_;491    var precinctParameters = subband.resolution.precinctParameters;492    var codeblocks = [];493    var precincts = [];494    var i, j, codeblock, precinctNumber;495    for (j = cby0; j < cby1; j++) {496      for (i = cbx0; i < cbx1; i++) {497        codeblock = {498          cbx: i,499          cby: j,500          tbx0: codeblockWidth * i,501          tby0: codeblockHeight * j,502          tbx1: codeblockWidth * (i + 1),503          tby1: codeblockHeight * (j + 1)504        };505        codeblock.tbx0_ = Math.max(subband.tbx0, codeblock.tbx0);506        codeblock.tby0_ = Math.max(subband.tby0, codeblock.tby0);507        codeblock.tbx1_ = Math.min(subband.tbx1, codeblock.tbx1);508        codeblock.tby1_ = Math.min(subband.tby1, codeblock.tby1);509        var pi = Math.floor((codeblock.tbx0_ - subband.tbx0) / precinctParameters.precinctWidthInSubband);510        var pj = Math.floor((codeblock.tby0_ - subband.tby0) / precinctParameters.precinctHeightInSubband);511        precinctNumber = pi + pj * precinctParameters.numprecinctswide;512        codeblock.precinctNumber = precinctNumber;513        codeblock.subbandType = subband.type;514        codeblock.Lblock = 3;515        if (codeblock.tbx1_ <= codeblock.tbx0_ || codeblock.tby1_ <= codeblock.tby0_) {516          continue;517        }518        codeblocks.push(codeblock);519        var precinct = precincts[precinctNumber];520        if (precinct !== undefined) {521          if (i < precinct.cbxMin) {522            precinct.cbxMin = i;523          } else if (i > precinct.cbxMax) {524            precinct.cbxMax = i;525          }526          if (j < precinct.cbyMin) {527            precinct.cbxMin = j;528          } else if (j > precinct.cbyMax) {529            precinct.cbyMax = j;530          }531        } else {532          precincts[precinctNumber] = precinct = {533            cbxMin: i,534            cbyMin: j,535            cbxMax: i,536            cbyMax: j537          };538        }539        codeblock.precinct = precinct;540      }541    }542    subband.codeblockParameters = {543      codeblockWidth: xcb_,544      codeblockHeight: ycb_,545      numcodeblockwide: cbx1 - cbx0 + 1,546      numcodeblockhigh: cby1 - cby0 + 1547    };548    subband.codeblocks = codeblocks;549    subband.precincts = precincts;550  }551  function createPacket(resolution, precinctNumber, layerNumber) {552    var precinctCodeblocks = [];553    var subbands = resolution.subbands;554    for (var i = 0, ii = subbands.length; i < ii; i++) {555      var subband = subbands[i];556      var codeblocks = subband.codeblocks;557      for (var j = 0, jj = codeblocks.length; j < jj; j++) {558        var codeblock = codeblocks[j];559        if (codeblock.precinctNumber !== precinctNumber) {560          continue;561        }562        precinctCodeblocks.push(codeblock);563      }564    }565    return {566      layerNumber: layerNumber,567      codeblocks: precinctCodeblocks568    };569  }570  function LayerResolutionComponentPositionIterator(context) {571    var siz = context.SIZ;572    var tileIndex = context.currentTile.index;573    var tile = context.tiles[tileIndex];574    var layersCount = tile.codingStyleDefaultParameters.layersCount;575    var componentsCount = siz.Csiz;576    var maxDecompositionLevelsCount = 0;577    for (var q = 0; q < componentsCount; q++) {578      maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, tile.components[q].codingStyleParameters.decompositionLevelsCount);579    }580    var l = 0,581        r = 0,582        i = 0,583        k = 0;584    this.nextPacket = function JpxImage_nextPacket() {585      for (; l < layersCount; l++) {586        for (; r <= maxDecompositionLevelsCount; r++) {587          for (; i < componentsCount; i++) {588            var component = tile.components[i];589            if (r > component.codingStyleParameters.decompositionLevelsCount) {590              continue;591            }592            var resolution = component.resolutions[r];593            var numprecincts = resolution.precinctParameters.numprecincts;594            for (; k < numprecincts;) {595              var packet = createPacket(resolution, k, l);596              k++;597              return packet;598            }599            k = 0;600          }601          i = 0;602        }603        r = 0;604      }605      throw new JpxError('Out of packets');606    };607  }608  function ResolutionLayerComponentPositionIterator(context) {609    var siz = context.SIZ;610    var tileIndex = context.currentTile.index;611    var tile = context.tiles[tileIndex];612    var layersCount = tile.codingStyleDefaultParameters.layersCount;613    var componentsCount = siz.Csiz;614    var maxDecompositionLevelsCount = 0;615    for (var q = 0; q < componentsCount; q++) {616      maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, tile.components[q].codingStyleParameters.decompositionLevelsCount);617    }618    var r = 0,619        l = 0,620        i = 0,621        k = 0;622    this.nextPacket = function JpxImage_nextPacket() {623      for (; r <= maxDecompositionLevelsCount; r++) {624        for (; l < layersCount; l++) {625          for (; i < componentsCount; i++) {626            var component = tile.components[i];627            if (r > component.codingStyleParameters.decompositionLevelsCount) {628              continue;629            }630            var resolution = component.resolutions[r];631            var numprecincts = resolution.precinctParameters.numprecincts;632            for (; k < numprecincts;) {633              var packet = createPacket(resolution, k, l);634              k++;635              return packet;636            }637            k = 0;638          }639          i = 0;640        }641        l = 0;642      }643      throw new JpxError('Out of packets');644    };645  }646  function ResolutionPositionComponentLayerIterator(context) {647    var siz = context.SIZ;648    var tileIndex = context.currentTile.index;649    var tile = context.tiles[tileIndex];650    var layersCount = tile.codingStyleDefaultParameters.layersCount;651    var componentsCount = siz.Csiz;652    var l, r, c, p;653    var maxDecompositionLevelsCount = 0;654    for (c = 0; c < componentsCount; c++) {655      var component = tile.components[c];656      maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, component.codingStyleParameters.decompositionLevelsCount);657    }658    var maxNumPrecinctsInLevel = new Int32Array(maxDecompositionLevelsCount + 1);659    for (r = 0; r <= maxDecompositionLevelsCount; ++r) {660      var maxNumPrecincts = 0;661      for (c = 0; c < componentsCount; ++c) {662        var resolutions = tile.components[c].resolutions;663        if (r < resolutions.length) {664          maxNumPrecincts = Math.max(maxNumPrecincts, resolutions[r].precinctParameters.numprecincts);665        }666      }667      maxNumPrecinctsInLevel[r] = maxNumPrecincts;668    }669    l = 0;670    r = 0;671    c = 0;672    p = 0;673    this.nextPacket = function JpxImage_nextPacket() {674      for (; r <= maxDecompositionLevelsCount; r++) {675        for (; p < maxNumPrecinctsInLevel[r]; p++) {676          for (; c < componentsCount; c++) {677            var component = tile.components[c];678            if (r > component.codingStyleParameters.decompositionLevelsCount) {679              continue;680            }681            var resolution = component.resolutions[r];682            var numprecincts = resolution.precinctParameters.numprecincts;683            if (p >= numprecincts) {684              continue;685            }686            for (; l < layersCount;) {687              var packet = createPacket(resolution, p, l);688              l++;689              return packet;690            }691            l = 0;692          }693          c = 0;694        }695        p = 0;696      }697      throw new JpxError('Out of packets');698    };699  }700  function PositionComponentResolutionLayerIterator(context) {701    var siz = context.SIZ;702    var tileIndex = context.currentTile.index;703    var tile = context.tiles[tileIndex];704    var layersCount = tile.codingStyleDefaultParameters.layersCount;705    var componentsCount = siz.Csiz;706    var precinctsSizes = getPrecinctSizesInImageScale(tile);707    var precinctsIterationSizes = precinctsSizes;708    var l = 0,709        r = 0,710        c = 0,711        px = 0,712        py = 0;713    this.nextPacket = function JpxImage_nextPacket() {714      for (; py < precinctsIterationSizes.maxNumHigh; py++) {715        for (; px < precinctsIterationSizes.maxNumWide; px++) {716          for (; c < componentsCount; c++) {717            var component = tile.components[c];718            var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount;719            for (; r <= decompositionLevelsCount; r++) {720              var resolution = component.resolutions[r];721              var sizeInImageScale = precinctsSizes.components[c].resolutions[r];722              var k = getPrecinctIndexIfExist(px, py, sizeInImageScale, precinctsIterationSizes, resolution);723              if (k === null) {724                continue;725              }726              for (; l < layersCount;) {727                var packet = createPacket(resolution, k, l);728                l++;729                return packet;730              }731              l = 0;732            }733            r = 0;734          }735          c = 0;736        }737        px = 0;738      }739      throw new JpxError('Out of packets');740    };741  }742  function ComponentPositionResolutionLayerIterator(context) {743    var siz = context.SIZ;744    var tileIndex = context.currentTile.index;745    var tile = context.tiles[tileIndex];746    var layersCount = tile.codingStyleDefaultParameters.layersCount;747    var componentsCount = siz.Csiz;748    var precinctsSizes = getPrecinctSizesInImageScale(tile);749    var l = 0,750        r = 0,751        c = 0,752        px = 0,753        py = 0;754    this.nextPacket = function JpxImage_nextPacket() {755      for (; c < componentsCount; ++c) {756        var component = tile.components[c];757        var precinctsIterationSizes = precinctsSizes.components[c];758        var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount;759        for (; py < precinctsIterationSizes.maxNumHigh; py++) {760          for (; px < precinctsIterationSizes.maxNumWide; px++) {761            for (; r <= decompositionLevelsCount; r++) {762              var resolution = component.resolutions[r];763              var sizeInImageScale = precinctsIterationSizes.resolutions[r];764              var k = getPrecinctIndexIfExist(px, py, sizeInImageScale, precinctsIterationSizes, resolution);765              if (k === null) {766                continue;767              }768              for (; l < layersCount;) {769                var packet = createPacket(resolution, k, l);770                l++;771                return packet;772              }773              l = 0;774            }775            r = 0;776          }777          px = 0;778        }779        py = 0;780      }781      throw new JpxError('Out of packets');782    };783  }784  function getPrecinctIndexIfExist(pxIndex, pyIndex, sizeInImageScale, precinctIterationSizes, resolution) {785    var posX = pxIndex * precinctIterationSizes.minWidth;786    var posY = pyIndex * precinctIterationSizes.minHeight;787    if (posX % sizeInImageScale.width !== 0 || posY % sizeInImageScale.height !== 0) {788      return null;789    }790    var startPrecinctRowIndex = posY / sizeInImageScale.width * resolution.precinctParameters.numprecinctswide;791    return posX / sizeInImageScale.height + startPrecinctRowIndex;792  }793  function getPrecinctSizesInImageScale(tile) {794    var componentsCount = tile.components.length;795    var minWidth = Number.MAX_VALUE;796    var minHeight = Number.MAX_VALUE;797    var maxNumWide = 0;798    var maxNumHigh = 0;799    var sizePerComponent = new Array(componentsCount);800    for (var c = 0; c < componentsCount; c++) {801      var component = tile.components[c];802      var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount;803      var sizePerResolution = new Array(decompositionLevelsCount + 1);804      var minWidthCurrentComponent = Number.MAX_VALUE;805      var minHeightCurrentComponent = Number.MAX_VALUE;806      var maxNumWideCurrentComponent = 0;807      var maxNumHighCurrentComponent = 0;808      var scale = 1;809      for (var r = decompositionLevelsCount; r >= 0; --r) {810        var resolution = component.resolutions[r];811        var widthCurrentResolution = scale * resolution.precinctParameters.precinctWidth;812        var heightCurrentResolution = scale * resolution.precinctParameters.precinctHeight;813        minWidthCurrentComponent = Math.min(minWidthCurrentComponent, widthCurrentResolution);814        minHeightCurrentComponent = Math.min(minHeightCurrentComponent, heightCurrentResolution);815        maxNumWideCurrentComponent = Math.max(maxNumWideCurrentComponent, resolution.precinctParameters.numprecinctswide);816        maxNumHighCurrentComponent = Math.max(maxNumHighCurrentComponent, resolution.precinctParameters.numprecinctshigh);817        sizePerResolution[r] = {818          width: widthCurrentResolution,819          height: heightCurrentResolution820        };821        scale <<= 1;822      }823      minWidth = Math.min(minWidth, minWidthCurrentComponent);824      minHeight = Math.min(minHeight, minHeightCurrentComponent);825      maxNumWide = Math.max(maxNumWide, maxNumWideCurrentComponent);826      maxNumHigh = Math.max(maxNumHigh, maxNumHighCurrentComponent);827      sizePerComponent[c] = {828        resolutions: sizePerResolution,829        minWidth: minWidthCurrentComponent,830        minHeight: minHeightCurrentComponent,831        maxNumWide: maxNumWideCurrentComponent,832        maxNumHigh: maxNumHighCurrentComponent833      };834    }835    return {836      components: sizePerComponent,837      minWidth: minWidth,838      minHeight: minHeight,839      maxNumWide: maxNumWide,840      maxNumHigh: maxNumHigh841    };842  }843  function buildPackets(context) {844    var siz = context.SIZ;845    var tileIndex = context.currentTile.index;846    var tile = context.tiles[tileIndex];847    var componentsCount = siz.Csiz;848    for (var c = 0; c < componentsCount; c++) {849      var component = tile.components[c];850      var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount;851      var resolutions = [];852      var subbands = [];853      for (var r = 0; r <= decompositionLevelsCount; r++) {854        var blocksDimensions = getBlocksDimensions(context, component, r);855        var resolution = {};856        var scale = 1 << decompositionLevelsCount - r;857        resolution.trx0 = Math.ceil(component.tcx0 / scale);858        resolution.try0 = Math.ceil(component.tcy0 / scale);859        resolution.trx1 = Math.ceil(component.tcx1 / scale);860        resolution.try1 = Math.ceil(component.tcy1 / scale);861        resolution.resLevel = r;862        buildPrecincts(context, resolution, blocksDimensions);863        resolutions.push(resolution);864        var subband;865        if (r === 0) {866          subband = {};867          subband.type = 'LL';868          subband.tbx0 = Math.ceil(component.tcx0 / scale);869          subband.tby0 = Math.ceil(component.tcy0 / scale);870          subband.tbx1 = Math.ceil(component.tcx1 / scale);871          subband.tby1 = Math.ceil(component.tcy1 / scale);872          subband.resolution = resolution;873          buildCodeblocks(context, subband, blocksDimensions);874          subbands.push(subband);875          resolution.subbands = [subband];876        } else {877          var bscale = 1 << decompositionLevelsCount - r + 1;878          var resolutionSubbands = [];879          subband = {};880          subband.type = 'HL';881          subband.tbx0 = Math.ceil(component.tcx0 / bscale - 0.5);882          subband.tby0 = Math.ceil(component.tcy0 / bscale);883          subband.tbx1 = Math.ceil(component.tcx1 / bscale - 0.5);884          subband.tby1 = Math.ceil(component.tcy1 / bscale);885          subband.resolution = resolution;886          buildCodeblocks(context, subband, blocksDimensions);887          subbands.push(subband);888          resolutionSubbands.push(subband);889          subband = {};890          subband.type = 'LH';891          subband.tbx0 = Math.ceil(component.tcx0 / bscale);892          subband.tby0 = Math.ceil(component.tcy0 / bscale - 0.5);893          subband.tbx1 = Math.ceil(component.tcx1 / bscale);894          subband.tby1 = Math.ceil(component.tcy1 / bscale - 0.5);895          subband.resolution = resolution;896          buildCodeblocks(context, subband, blocksDimensions);897          subbands.push(subband);898          resolutionSubbands.push(subband);899          subband = {};900          subband.type = 'HH';901          subband.tbx0 = Math.ceil(component.tcx0 / bscale - 0.5);902          subband.tby0 = Math.ceil(component.tcy0 / bscale - 0.5);903          subband.tbx1 = Math.ceil(component.tcx1 / bscale - 0.5);904          subband.tby1 = Math.ceil(component.tcy1 / bscale - 0.5);905          subband.resolution = resolution;906          buildCodeblocks(context, subband, blocksDimensions);907          subbands.push(subband);908          resolutionSubbands.push(subband);909          resolution.subbands = resolutionSubbands;910        }911      }912      component.resolutions = resolutions;913      component.subbands = subbands;914    }915    var progressionOrder = tile.codingStyleDefaultParameters.progressionOrder;916    switch (progressionOrder) {917      case 0:918        tile.packetsIterator = new LayerResolutionComponentPositionIterator(context);919        break;920      case 1:921        tile.packetsIterator = new ResolutionLayerComponentPositionIterator(context);922        break;923      case 2:924        tile.packetsIterator = new ResolutionPositionComponentLayerIterator(context);925        break;926      case 3:927        tile.packetsIterator = new PositionComponentResolutionLayerIterator(context);928        break;929      case 4:930        tile.packetsIterator = new ComponentPositionResolutionLayerIterator(context);931        break;932      default:933        throw new JpxError('Unsupported progression order ' + progressionOrder);934    }935  }936  function parseTilePackets(context, data, offset, dataLength) {937    var position = 0;938    var buffer,939        bufferSize = 0,940        skipNextBit = false;941    function readBits(count) {942      while (bufferSize < count) {943        var b = data[offset + position];944        position++;945        if (skipNextBit) {946          buffer = buffer << 7 | b;947          bufferSize += 7;948          skipNextBit = false;949        } else {950          buffer = buffer << 8 | b;951          bufferSize += 8;952        }953        if (b === 0xFF) {954          skipNextBit = true;955        }956      }957      bufferSize -= count;958      return buffer >>> bufferSize & (1 << count) - 1;959    }960    function skipMarkerIfEqual(value) {961      if (data[offset + position - 1] === 0xFF && data[offset + position] === value) {962        skipBytes(1);963        return true;964      } else if (data[offset + position] === 0xFF && data[offset + position + 1] === value) {965        skipBytes(2);966        return true;967      }968      return false;969    }970    function skipBytes(count) {971      position += count;972    }973    function alignToByte() {974      bufferSize = 0;975      if (skipNextBit) {976        position++;977        skipNextBit = false;978      }979    }980    function readCodingpasses() {981      if (readBits(1) === 0) {982        return 1;983      }984      if (readBits(1) === 0) {985        return 2;986      }987      var value = readBits(2);988      if (value < 3) {989        return value + 3;990      }991      value = readBits(5);992      if (value < 31) {993        return value + 6;994      }995      value = readBits(7);996      return value + 37;997    }998    var tileIndex = context.currentTile.index;999    var tile = context.tiles[tileIndex];1000    var sopMarkerUsed = context.COD.sopMarkerUsed;1001    var ephMarkerUsed = context.COD.ephMarkerUsed;1002    var packetsIterator = tile.packetsIterator;1003    while (position < dataLength) {1004      alignToByte();1005      if (sopMarkerUsed && skipMarkerIfEqual(0x91)) {1006        skipBytes(4);1007      }1008      var packet = packetsIterator.nextPacket();1009      if (!readBits(1)) {1010        continue;1011      }1012      var layerNumber = packet.layerNumber;1013      var queue = [],1014          codeblock;1015      for (var i = 0, ii = packet.codeblocks.length; i < ii; i++) {1016        codeblock = packet.codeblocks[i];1017        var precinct = codeblock.precinct;1018        var codeblockColumn = codeblock.cbx - precinct.cbxMin;1019        var codeblockRow = codeblock.cby - precinct.cbyMin;1020        var codeblockIncluded = false;1021        var firstTimeInclusion = false;1022        var valueReady;1023        if (codeblock['included'] !== undefined) {1024          codeblockIncluded = !!readBits(1);1025        } else {1026          precinct = codeblock.precinct;1027          var inclusionTree, zeroBitPlanesTree;1028          if (precinct['inclusionTree'] !== undefined) {1029            inclusionTree = precinct.inclusionTree;1030          } else {1031            var width = precinct.cbxMax - precinct.cbxMin + 1;1032            var height = precinct.cbyMax - precinct.cbyMin + 1;1033            inclusionTree = new InclusionTree(width, height, layerNumber);1034            zeroBitPlanesTree = new TagTree(width, height);1035            precinct.inclusionTree = inclusionTree;1036            precinct.zeroBitPlanesTree = zeroBitPlanesTree;1037          }1038          if (inclusionTree.reset(codeblockColumn, codeblockRow, layerNumber)) {1039            while (true) {1040              if (readBits(1)) {1041                valueReady = !inclusionTree.nextLevel();1042                if (valueReady) {1043                  codeblock.included = true;1044                  codeblockIncluded = firstTimeInclusion = true;1045                  break;1046                }1047              } else {1048                inclusionTree.incrementValue(layerNumber);1049                break;1050              }1051            }1052          }1053        }1054        if (!codeblockIncluded) {1055          continue;1056        }1057        if (firstTimeInclusion) {1058          zeroBitPlanesTree = precinct.zeroBitPlanesTree;1059          zeroBitPlanesTree.reset(codeblockColumn, codeblockRow);1060          while (true) {1061            if (readBits(1)) {1062              valueReady = !zeroBitPlanesTree.nextLevel();1063              if (valueReady) {1064                break;1065              }1066            } else {1067              zeroBitPlanesTree.incrementValue();1068            }1069          }1070          codeblock.zeroBitPlanes = zeroBitPlanesTree.value;1071        }1072        var codingpasses = readCodingpasses();1073        while (readBits(1)) {1074          codeblock.Lblock++;1075        }1076        var codingpassesLog2 = (0, _util.log2)(codingpasses);1077        var bits = (codingpasses < 1 << codingpassesLog2 ? codingpassesLog2 - 1 : codingpassesLog2) + codeblock.Lblock;1078        var codedDataLength = readBits(bits);1079        queue.push({1080          codeblock: codeblock,1081          codingpasses: codingpasses,1082          dataLength: codedDataLength1083        });1084      }1085      alignToByte();1086      if (ephMarkerUsed) {1087        skipMarkerIfEqual(0x92);1088      }1089      while (queue.length > 0) {1090        var packetItem = queue.shift();1091        codeblock = packetItem.codeblock;1092        if (codeblock['data'] === undefined) {1093          codeblock.data = [];1094        }1095        codeblock.data.push({1096          data: data,1097          start: offset + position,1098          end: offset + position + packetItem.dataLength,1099          codingpasses: packetItem.codingpasses1100        });1101        position += packetItem.dataLength;1102      }1103    }1104    return position;1105  }1106  function copyCoefficients(coefficients, levelWidth, levelHeight, subband, delta, mb, reversible, segmentationSymbolUsed) {1107    var x0 = subband.tbx0;1108    var y0 = subband.tby0;1109    var width = subband.tbx1 - subband.tbx0;1110    var codeblocks = subband.codeblocks;1111    var right = subband.type.charAt(0) === 'H' ? 1 : 0;1112    var bottom = subband.type.charAt(1) === 'H' ? levelWidth : 0;1113    for (var i = 0, ii = codeblocks.length; i < ii; ++i) {1114      var codeblock = codeblocks[i];1115      var blockWidth = codeblock.tbx1_ - codeblock.tbx0_;1116      var blockHeight = codeblock.tby1_ - codeblock.tby0_;1117      if (blockWidth === 0 || blockHeight === 0) {1118        continue;1119      }1120      if (codeblock['data'] === undefined) {1121        continue;1122      }1123      var bitModel, currentCodingpassType;1124      bitModel = new BitModel(blockWidth, blockHeight, codeblock.subbandType, codeblock.zeroBitPlanes, mb);1125      currentCodingpassType = 2;1126      var data = codeblock.data,1127          totalLength = 0,1128          codingpasses = 0;1129      var j, jj, dataItem;1130      for (j = 0, jj = data.length; j < jj; j++) {1131        dataItem = data[j];1132        totalLength += dataItem.end - dataItem.start;1133        codingpasses += dataItem.codingpasses;1134      }1135      var encodedData = new Uint8Array(totalLength);1136      var position = 0;1137      for (j = 0, jj = data.length; j < jj; j++) {1138        dataItem = data[j];1139        var chunk = dataItem.data.subarray(dataItem.start, dataItem.end);1140        encodedData.set(chunk, position);1141        position += chunk.length;1142      }1143      var decoder = new _arithmetic_decoder.ArithmeticDecoder(encodedData, 0, totalLength);1144      bitModel.setDecoder(decoder);1145      for (j = 0; j < codingpasses; j++) {1146        switch (currentCodingpassType) {1147          case 0:1148            bitModel.runSignificancePropagationPass();1149            break;1150          case 1:1151            bitModel.runMagnitudeRefinementPass();1152            break;1153          case 2:1154            bitModel.runCleanupPass();1155            if (segmentationSymbolUsed) {1156              bitModel.checkSegmentationSymbol();1157            }1158            break;1159        }1160        currentCodingpassType = (currentCodingpassType + 1) % 3;1161      }1162      var offset = codeblock.tbx0_ - x0 + (codeblock.tby0_ - y0) * width;1163      var sign = bitModel.coefficentsSign;1164      var magnitude = bitModel.coefficentsMagnitude;1165      var bitsDecoded = bitModel.bitsDecoded;1166      var magnitudeCorrection = reversible ? 0 : 0.5;1167      var k, n, nb;1168      position = 0;1169      var interleave = subband.type !== 'LL';1170      for (j = 0; j < blockHeight; j++) {1171        var row = offset / width | 0;1172        var levelOffset = 2 * row * (levelWidth - width) + right + bottom;1173        for (k = 0; k < blockWidth; k++) {1174          n = magnitude[position];1175          if (n !== 0) {1176            n = (n + magnitudeCorrection) * delta;1177            if (sign[position] !== 0) {1178              n = -n;1179            }1180            nb = bitsDecoded[position];1181            var pos = interleave ? levelOffset + (offset << 1) : offset;1182            if (reversible && nb >= mb) {1183              coefficients[pos] = n;1184            } else {1185              coefficients[pos] = n * (1 << mb - nb);1186            }1187          }1188          offset++;1189          position++;1190        }1191        offset += width - blockWidth;1192      }1193    }1194  }1195  function transformTile(context, tile, c) {1196    var component = tile.components[c];1197    var codingStyleParameters = component.codingStyleParameters;1198    var quantizationParameters = component.quantizationParameters;1199    var decompositionLevelsCount = codingStyleParameters.decompositionLevelsCount;1200    var spqcds = quantizationParameters.SPqcds;1201    var scalarExpounded = quantizationParameters.scalarExpounded;1202    var guardBits = quantizationParameters.guardBits;1203    var segmentationSymbolUsed = codingStyleParameters.segmentationSymbolUsed;1204    var precision = context.components[c].precision;1205    var reversible = codingStyleParameters.reversibleTransformation;1206    var transform = reversible ? new ReversibleTransform() : new IrreversibleTransform();1207    var subbandCoefficients = [];1208    var b = 0;1209    for (var i = 0; i <= decompositionLevelsCount; i++) {1210      var resolution = component.resolutions[i];1211      var width = resolution.trx1 - resolution.trx0;1212      var height = resolution.try1 - resolution.try0;1213      var coefficients = new Float32Array(width * height);1214      for (var j = 0, jj = resolution.subbands.length; j < jj; j++) {1215        var mu, epsilon;1216        if (!scalarExpounded) {1217          mu = spqcds[0].mu;1218          epsilon = spqcds[0].epsilon + (i > 0 ? 1 - i : 0);1219        } else {1220          mu = spqcds[b].mu;1221          epsilon = spqcds[b].epsilon;1222          b++;1223        }1224        var subband = resolution.subbands[j];1225        var gainLog2 = SubbandsGainLog2[subband.type];1226        var delta = reversible ? 1 : Math.pow(2, precision + gainLog2 - epsilon) * (1 + mu / 2048);1227        var mb = guardBits + epsilon - 1;1228        copyCoefficients(coefficients, width, height, subband, delta, mb, reversible, segmentationSymbolUsed);1229      }1230      subbandCoefficients.push({1231        width: width,1232        height: height,1233        items: coefficients1234      });1235    }1236    var result = transform.calculate(subbandCoefficients, component.tcx0, component.tcy0);1237    return {1238      left: component.tcx0,1239      top: component.tcy0,1240      width: result.width,1241      height: result.height,1242      items: result.items1243    };1244  }1245  function transformComponents(context) {1246    var siz = context.SIZ;1247    var components = context.components;1248    var componentsCount = siz.Csiz;1249    var resultImages = [];1250    for (var i = 0, ii = context.tiles.length; i < ii; i++) {1251      var tile = context.tiles[i];1252      var transformedTiles = [];1253      var c;1254      for (c = 0; c < componentsCount; c++) {1255        transformedTiles[c] = transformTile(context, tile, c);1256      }1257      var tile0 = transformedTiles[0];1258      var out = new Uint8ClampedArray(tile0.items.length * componentsCount);1259      var result = {1260        left: tile0.left,1261        top: tile0.top,1262        width: tile0.width,1263        height: tile0.height,1264        items: out1265      };1266      var shift, offset;1267      var pos = 0,1268          j,1269          jj,1270          y0,1271          y1,1272          y2;1273      if (tile.codingStyleDefaultParameters.multipleComponentTransform) {1274        var fourComponents = componentsCount === 4;1275        var y0items = transformedTiles[0].items;1276        var y1items = transformedTiles[1].items;1277        var y2items = transformedTiles[2].items;1278        var y3items = fourComponents ? transformedTiles[3].items : null;1279        shift = components[0].precision - 8;1280        offset = (128 << shift) + 0.5;1281        var component0 = tile.components[0];1282        var alpha01 = componentsCount - 3;1283        jj = y0items.length;1284        if (!component0.codingStyleParameters.reversibleTransformation) {1285          for (j = 0; j < jj; j++, pos += alpha01) {1286            y0 = y0items[j] + offset;1287            y1 = y1items[j];1288            y2 = y2items[j];1289            out[pos++] = y0 + 1.402 * y2 >> shift;1290            out[pos++] = y0 - 0.34413 * y1 - 0.71414 * y2 >> shift;1291            out[pos++] = y0 + 1.772 * y1 >> shift;1292          }1293        } else {1294          for (j = 0; j < jj; j++, pos += alpha01) {1295            y0 = y0items[j] + offset;1296            y1 = y1items[j];1297            y2 = y2items[j];1298            var g = y0 - (y2 + y1 >> 2);1299            out[pos++] = g + y2 >> shift;1300            out[pos++] = g >> shift;1301            out[pos++] = g + y1 >> shift;1302          }1303        }1304        if (fourComponents) {1305          for (j = 0, pos = 3; j < jj; j++, pos += 4) {1306            out[pos] = y3items[j] + offset >> shift;1307          }1308        }1309      } else {1310        for (c = 0; c < componentsCount; c++) {1311          var items = transformedTiles[c].items;1312          shift = components[c].precision - 8;1313          offset = (128 << shift) + 0.5;1314          for (pos = c, j = 0, jj = items.length; j < jj; j++) {1315            out[pos] = items[j] + offset >> shift;1316            pos += componentsCount;1317          }1318        }1319      }1320      resultImages.push(result);1321    }1322    return resultImages;1323  }1324  function initializeTile(context, tileIndex) {1325    var siz = context.SIZ;1326    var componentsCount = siz.Csiz;1327    var tile = context.tiles[tileIndex];1328    for (var c = 0; c < componentsCount; c++) {1329      var component = tile.components[c];1330      var qcdOrQcc = context.currentTile.QCC[c] !== undefined ? context.currentTile.QCC[c] : context.currentTile.QCD;1331      component.quantizationParameters = qcdOrQcc;1332      var codOrCoc = context.currentTile.COC[c] !== undefined ? context.currentTile.COC[c] : context.currentTile.COD;1333      component.codingStyleParameters = codOrCoc;1334    }1335    tile.codingStyleDefaultParameters = context.currentTile.COD;1336  }1337  var TagTree = function TagTreeClosure() {1338    function TagTree(width, height) {1339      var levelsLength = (0, _util.log2)(Math.max(width, height)) + 1;1340      this.levels = [];1341      for (var i = 0; i < levelsLength; i++) {1342        var level = {1343          width: width,1344          height: height,1345          items: []1346        };1347        this.levels.push(level);1348        width = Math.ceil(width / 2);1349        height = Math.ceil(height / 2);1350      }1351    }1352    TagTree.prototype = {1353      reset: function TagTree_reset(i, j) {1354        var currentLevel = 0,1355            value = 0,1356            level;1357        while (currentLevel < this.levels.length) {1358          level = this.levels[currentLevel];1359          var index = i + j * level.width;1360          if (level.items[index] !== undefined) {1361            value = level.items[index];1362            break;1363          }1364          level.index = index;1365          i >>= 1;1366          j >>= 1;1367          currentLevel++;1368        }1369        currentLevel--;1370        level = this.levels[currentLevel];1371        level.items[level.index] = value;1372        this.currentLevel = currentLevel;1373        delete this.value;1374      },1375      incrementValue: function TagTree_incrementValue() {1376        var level = this.levels[this.currentLevel];1377        level.items[level.index]++;1378      },1379      nextLevel: function TagTree_nextLevel() {1380        var currentLevel = this.currentLevel;1381        var level = this.levels[currentLevel];1382        var value = level.items[level.index];1383        currentLevel--;1384        if (currentLevel < 0) {1385          this.value = value;1386          return false;1387        }1388        this.currentLevel = currentLevel;1389        level = this.levels[currentLevel];1390        level.items[level.index] = value;1391        return true;1392      }1393    };1394    return TagTree;1395  }();1396  var InclusionTree = function InclusionTreeClosure() {1397    function InclusionTree(width, height, defaultValue) {1398      var levelsLength = (0, _util.log2)(Math.max(width, height)) + 1;1399      this.levels = [];1400      for (var i = 0; i < levelsLength; i++) {1401        var items = new Uint8Array(width * height);1402        for (var j = 0, jj = items.length; j < jj; j++) {1403          items[j] = defaultValue;1404        }1405        var level = {1406          width: width,1407          height: height,1408          items: items1409        };1410        this.levels.push(level);1411        width = Math.ceil(width / 2);1412        height = Math.ceil(height / 2);1413      }1414    }1415    InclusionTree.prototype = {1416      reset: function InclusionTree_reset(i, j, stopValue) {1417        var currentLevel = 0;1418        while (currentLevel < this.levels.length) {1419          var level = this.levels[currentLevel];1420          var index = i + j * level.width;1421          level.index = index;1422          var value = level.items[index];1423          if (value === 0xFF) {1424            break;1425          }1426          if (value > stopValue) {1427            this.currentLevel = currentLevel;1428            this.propagateValues();1429            return false;1430          }1431          i >>= 1;1432          j >>= 1;1433          currentLevel++;1434        }1435        this.currentLevel = currentLevel - 1;1436        return true;1437      },1438      incrementValue: function InclusionTree_incrementValue(stopValue) {1439        var level = this.levels[this.currentLevel];1440        level.items[level.index] = stopValue + 1;1441        this.propagateValues();1442      },1443      propagateValues: function InclusionTree_propagateValues() {1444        var levelIndex = this.currentLevel;1445        var level = this.levels[levelIndex];1446        var currentValue = level.items[level.index];1447        while (--levelIndex >= 0) {1448          level = this.levels[levelIndex];1449          level.items[level.index] = currentValue;1450        }1451      },1452      nextLevel: function InclusionTree_nextLevel() {1453        var currentLevel = this.currentLevel;1454        var level = this.levels[currentLevel];1455        var value = level.items[level.index];1456        level.items[level.index] = 0xFF;1457        currentLevel--;1458        if (currentLevel < 0) {1459          return false;1460        }1461        this.currentLevel = currentLevel;1462        level = this.levels[currentLevel];1463        level.items[level.index] = value;1464        return true;1465      }1466    };1467    return InclusionTree;1468  }();1469  var BitModel = function BitModelClosure() {1470    var UNIFORM_CONTEXT = 17;1471    var RUNLENGTH_CONTEXT = 18;1472    var LLAndLHContextsLabel = new Uint8Array([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, 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, 8, 0, 3, 7, 8, 0, 4, 7, 8, 0, 0, 0, 0, 0, 2, 6, 8, 0, 3, 7, 8, 0, 4, 7, 8]);1473    var HLContextLabel = new Uint8Array([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, 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, 4, 0, 6, 7, 7, 0, 8, 8, 8, 0, 0, 0, 0, 0, 2, 3, 4, 0, 6, 7, 7, 0, 8, 8, 8]);1474    var HHContextLabel = new Uint8Array([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, 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, 8, 0, 8, 8, 8, 0, 8, 8, 8, 0, 0, 0, 0, 0, 8, 8, 8, 0, 8, 8, 8, 0, 8, 8, 8]);1475    function BitModel(width, height, subband, zeroBitPlanes, mb) {1476      this.width = width;1477      this.height = height;1478      this.contextLabelTable = subband === 'HH' ? HHContextLabel : subband === 'HL' ? HLContextLabel : LLAndLHContextsLabel;1479      var coefficientCount = width * height;1480      this.neighborsSignificance = new Uint8Array(coefficientCount);1481      this.coefficentsSign = new Uint8Array(coefficientCount);1482      this.coefficentsMagnitude = mb > 14 ? new Uint32Array(coefficientCount) : mb > 6 ? new Uint16Array(coefficientCount) : new Uint8Array(coefficientCount);1483      this.processingFlags = new Uint8Array(coefficientCount);1484      var bitsDecoded = new Uint8Array(coefficientCount);1485      if (zeroBitPlanes !== 0) {1486        for (var i = 0; i < coefficientCount; i++) {1487          bitsDecoded[i] = zeroBitPlanes;1488        }1489      }1490      this.bitsDecoded = bitsDecoded;1491      this.reset();1492    }1493    BitModel.prototype = {1494      setDecoder: function BitModel_setDecoder(decoder) {1495        this.decoder = decoder;1496      },1497      reset: function BitModel_reset() {1498        this.contexts = new Int8Array(19);1499        this.contexts[0] = 4 << 1 | 0;1500        this.contexts[UNIFORM_CONTEXT] = 46 << 1 | 0;1501        this.contexts[RUNLENGTH_CONTEXT] = 3 << 1 | 0;1502      },1503      setNeighborsSignificance: function BitModel_setNeighborsSignificance(row, column, index) {1504        var neighborsSignificance = this.neighborsSignificance;1505        var width = this.width,1506            height = this.height;1507        var left = column > 0;1508        var right = column + 1 < width;1509        var i;1510        if (row > 0) {1511          i = index - width;1512          if (left) {1513            neighborsSignificance[i - 1] += 0x10;1514          }1515          if (right) {1516            neighborsSignificance[i + 1] += 0x10;1517          }1518          neighborsSignificance[i] += 0x04;1519        }1520        if (row + 1 < height) {1521          i = index + width;1522          if (left) {1523            neighborsSignificance[i - 1] += 0x10;1524          }1525          if (right) {1526            neighborsSignificance[i + 1] += 0x10;1527          }1528          neighborsSignificance[i] += 0x04;1529        }1530        if (left) {1531          neighborsSignificance[index - 1] += 0x01;1532        }1533        if (right) {1534          neighborsSignificance[index + 1] += 0x01;1535        }1536        neighborsSignificance[index] |= 0x80;1537      },1538      runSignificancePropagationPass: function BitModel_runSignificancePropagationPass() {1539        var decoder = this.decoder;1540        var width = this.width,1541            height = this.height;1542        var coefficentsMagnitude = this.coefficentsMagnitude;1543        var coefficentsSign = this.coefficentsSign;1544        var neighborsSignificance = this.neighborsSignificance;1545        var processingFlags = this.processingFlags;1546        var contexts = this.contexts;1547        var labels = this.contextLabelTable;1548        var bitsDecoded = this.bitsDecoded;1549        var processedInverseMask = ~1;1550        var processedMask = 1;1551        var firstMagnitudeBitMask = 2;1552        for (var i0 = 0; i0 < height; i0 += 4) {1553          for (var j = 0; j < width; j++) {1554            var index = i0 * width + j;1555            for (var i1 = 0; i1 < 4; i1++, index += width) {1556              var i = i0 + i1;1557              if (i >= height) {1558                break;1559              }1560              processingFlags[index] &= processedInverseMask;1561              if (coefficentsMagnitude[index] || !neighborsSignificance[index]) {1562                continue;1563              }1564              var contextLabel = labels[neighborsSignificance[index]];1565              var decision = decoder.readBit(contexts, contextLabel);1566              if (decision) {1567                var sign = this.decodeSignBit(i, j, index);1568                coefficentsSign[index] = sign;1569                coefficentsMagnitude[index] = 1;1570                this.setNeighborsSignificance(i, j, index);1571                processingFlags[index] |= firstMagnitudeBitMask;1572              }1573              bitsDecoded[index]++;1574              processingFlags[index] |= processedMask;1575            }1576          }1577        }1578      },1579      decodeSignBit: function BitModel_decodeSignBit(row, column, index) {1580        var width = this.width,1581            height = this.height;1582        var coefficentsMagnitude = this.coefficentsMagnitude;1583        var coefficentsSign = this.coefficentsSign;1584        var contribution, sign0, sign1, significance1;1585        var contextLabel, decoded;1586        significance1 = column > 0 && coefficentsMagnitude[index - 1] !== 0;1587        if (column + 1 < width && coefficentsMagnitude[index + 1] !== 0) {1588          sign1 = coefficentsSign[index + 1];1589          if (significance1) {1590            sign0 = coefficentsSign[index - 1];1591            contribution = 1 - sign1 - sign0;1592          } else {1593            contribution = 1 - sign1 - sign1;1594          }1595        } else if (significance1) {1596          sign0 = coefficentsSign[index - 1];1597          contribution = 1 - sign0 - sign0;1598        } else {1599          contribution = 0;1600        }1601        var horizontalContribution = 3 * contribution;1602        significance1 = row > 0 && coefficentsMagnitude[index - width] !== 0;1603        if (row + 1 < height && coefficentsMagnitude[index + width] !== 0) {1604          sign1 = coefficentsSign[index + width];1605          if (significance1) {1606            sign0 = coefficentsSign[index - width];1607            contribution = 1 - sign1 - sign0 + horizontalContribution;1608          } else {1609            contribution = 1 - sign1 - sign1 + horizontalContribution;1610          }1611        } else if (significance1) {1612          sign0 = coefficentsSign[index - width];1613          contribution = 1 - sign0 - sign0 + horizontalContribution;1614        } else {1615          contribution = horizontalContribution;1616        }1617        if (contribution >= 0) {1618          contextLabel = 9 + contribution;1619          decoded = this.decoder.readBit(this.contexts, contextLabel);1620        } else {1621          contextLabel = 9 - contribution;1622          decoded = this.decoder.readBit(this.contexts, contextLabel) ^ 1;1623        }1624        return decoded;1625      },1626      runMagnitudeRefinementPass: function BitModel_runMagnitudeRefinementPass() {1627        var decoder = this.decoder;1628        var width = this.width,1629            height = this.height;1630        var coefficentsMagnitude = this.coefficentsMagnitude;1631        var neighborsSignificance = this.neighborsSignificance;1632        var contexts = this.contexts;1633        var bitsDecoded = this.bitsDecoded;1634        var processingFlags = this.processingFlags;1635        var processedMask = 1;1636        var firstMagnitudeBitMask = 2;1637        var length = width * height;1638        var width4 = width * 4;1639        for (var index0 = 0, indexNext; index0 < length; index0 = indexNext) {1640          indexNext = Math.min(length, index0 + width4);1641          for (var j = 0; j < width; j++) {1642            for (var index = index0 + j; index < indexNext; index += width) {1643              if (!coefficentsMagnitude[index] || (processingFlags[index] & processedMask) !== 0) {1644                continue;1645              }1646              var contextLabel = 16;1647              if ((processingFlags[index] & firstMagnitudeBitMask) !== 0) {1648                processingFlags[index] ^= firstMagnitudeBitMask;1649                var significance = neighborsSignificance[index] & 127;1650                contextLabel = significance === 0 ? 15 : 14;1651              }1652              var bit = decoder.readBit(contexts, contextLabel);1653              coefficentsMagnitude[index] = coefficentsMagnitude[index] << 1 | bit;1654              bitsDecoded[index]++;1655              processingFlags[index] |= processedMask;1656            }1657          }1658        }1659      },1660      runCleanupPass: function BitModel_runCleanupPass() {1661        var decoder = this.decoder;1662        var width = this.width,1663            height = this.height;1664        var neighborsSignificance = this.neighborsSignificance;1665        var coefficentsMagnitude = this.coefficentsMagnitude;1666        var coefficentsSign = this.coefficentsSign;1667        var contexts = this.contexts;1668        var labels = this.contextLabelTable;1669        var bitsDecoded = this.bitsDecoded;1670        var processingFlags = this.processingFlags;1671        var processedMask = 1;1672        var firstMagnitudeBitMask = 2;1673        var oneRowDown = width;1674        var twoRowsDown = width * 2;1675        var threeRowsDown = width * 3;1676        var iNext;1677        for (var i0 = 0; i0 < height; i0 = iNext) {1678          iNext = Math.min(i0 + 4, height);1679          var indexBase = i0 * width;1680          var checkAllEmpty = i0 + 3 < height;1681          for (var j = 0; j < width; j++) {1682            var index0 = indexBase + j;1683            var allEmpty = checkAllEmpty && processingFlags[index0] === 0 && processingFlags[index0 + oneRowDown] === 0 && processingFlags[index0 + twoRowsDown] === 0 && processingFlags[index0 + threeRowsDown] === 0 && neighborsSignificance[index0] === 0 && neighborsSignificance[index0 + oneRowDown] === 0 && neighborsSignificance[index0 + twoRowsDown] === 0 && neighborsSignificance[index0 + threeRowsDown] === 0;1684            var i1 = 0,1685                index = index0;1686            var i = i0,1687                sign;1688            if (allEmpty) {1689              var hasSignificantCoefficent = decoder.readBit(contexts, RUNLENGTH_CONTEXT);1690              if (!hasSignificantCoefficent) {1691                bitsDecoded[index0]++;1692                bitsDecoded[index0 + oneRowDown]++;1693                bitsDecoded[index0 + twoRowsDown]++;1694                bitsDecoded[index0 + threeRowsDown]++;1695                continue;1696              }1697              i1 = decoder.readBit(contexts, UNIFORM_CONTEXT) << 1 | decoder.readBit(contexts, UNIFORM_CONTEXT);1698              if (i1 !== 0) {1699                i = i0 + i1;1700                index += i1 * width;1701              }1702              sign = this.decodeSignBit(i, j, index);1703              coefficentsSign[index] = sign;1704              coefficentsMagnitude[index] = 1;1705              this.setNeighborsSignificance(i, j, index);1706              processingFlags[index] |= firstMagnitudeBitMask;1707              index = index0;1708              for (var i2 = i0; i2 <= i; i2++, index += width) {1709                bitsDecoded[index]++;1710              }1711              i1++;1712            }1713            for (i = i0 + i1; i < iNext; i++, index += width) {1714              if (coefficentsMagnitude[index] || (processingFlags[index] & processedMask) !== 0) {1715                continue;1716              }1717              var contextLabel = labels[neighborsSignificance[index]];1718              var decision = decoder.readBit(contexts, contextLabel);1719              if (decision === 1) {1720                sign = this.decodeSignBit(i, j, index);1721                coefficentsSign[index] = sign;1722                coefficentsMagnitude[index] = 1;1723                this.setNeighborsSignificance(i, j, index);1724                processingFlags[index] |= firstMagnitudeBitMask;1725              }1726              bitsDecoded[index]++;1727            }1728          }1729        }1730      },1731      checkSegmentationSymbol: function BitModel_checkSegmentationSymbol() {1732        var decoder = this.decoder;1733        var contexts = this.contexts;1734        var symbol = decoder.readBit(contexts, UNIFORM_CONTEXT) << 3 | decoder.readBit(contexts, UNIFORM_CONTEXT) << 2 | decoder.readBit(contexts, UNIFORM_CONTEXT) << 1 | decoder.readBit(contexts, UNIFORM_CONTEXT);1735        if (symbol !== 0xA) {1736          throw new JpxError('Invalid segmentation symbol');1737        }1738      }1739    };1740    return BitModel;1741  }();1742  var Transform = function TransformClosure() {1743    function Transform() {}1744    Transform.prototype.calculate = function transformCalculate(subbands, u0, v0) {1745      var ll = subbands[0];1746      for (var i = 1, ii = subbands.length; i < ii; i++) {1747        ll = this.iterate(ll, subbands[i], u0, v0);1748      }1749      return ll;1750    };...

Using AI Code Generation

1wpt.JpxError('This is a test error');2wpt.JpxError('This is a test error');3wpt.JpxError('This is a test error');4wpt.JpxError('This is a test error');5wpt.JpxError('This is a test error');6wpt.JpxError('This is a test error');7wpt.JpxError('This is a test error');8wpt.JpxError('This is a test error');9wpt.JpxError('This is a test error');10wpt.JpxError('This is a test error');11wpt.JpxError('This is a test error');12wpt.JpxError('This is a test error');13wpt.JpxError('This is a test error');14wpt.JpxError('This is a test error');15wpt.JpxError('This is a test error');

Using AI Code Generation

1var wptutils = require('wptutils');2var err = new wptutils.JpxError('test error');3console.log(err.message);4var wptutils = require('wptutils');5var err = new wptutils.JpxError('test error');6console.log(err.message);7var wptutils = require('wptutils');8var err = new wptutils.JpxError('test error');9console.log(err.message);10var wptutils = require('wptutils');11var err = new wptutils.JpxError('test error');12console.log(err.message);13var wptutils = require('wptutils');14var err = new wptutils.JpxError('test error');15console.log(err.message);16var wptutils = require('wptutils');17var err = new wptutils.JpxError('test error');18console.log(err.message);19var wptutils = require('wptutils');20var err = new wptutils.JpxError('test error');21console.log(err.message);22var wptutils = require('wptutils');23var err = new wptutils.JpxError('test error');24console.log(err.message);25var wptutils = require('wptutils');26var err = new wptutils.JpxError('test error');27console.log(err.message);28var wptutils = require('wptutils');29var err = new wptutils.JpxError('test error');30console.log(err.message);31var wptutils = require('

Using AI Code Generation

1var wpt = require('wpt');2wpt.JpxError('This is a test of the JpxError method of the wpt module');3var wpt = require('wpt');4wpt.JpxError('This is a test of the JpxError method of the wpt module');5var wpt = require('wpt');6wpt.JpxError('This is a test of the JpxError method of the wpt module');7var wpt = require('wpt');8wpt.JpxError('This is a test of the JpxError method of the wpt module');9var wpt = require('wpt');10wpt.JpxError('This is a test of the JpxError method of the wpt module');11var wpt = require('wpt');12wpt.JpxError('This is a test of the JpxError method of the wpt module');13var wpt = require('wpt');14wpt.JpxError('This is a test of the JpxError method of the wpt module');15var wpt = require('wpt');16wpt.JpxError('This is a test of the JpxError method of the wpt module');17var wpt = require('wpt');18wpt.JpxError('This is a test of the JpxError method of the wpt module');19var wpt = require('wpt');20wpt.JpxError('This is a test of the JpxError method of the wpt module');21var wpt = require('wpt');22wpt.JpxError('This is a test of the JpxError method of the wpt module');23var wpt = require('wpt');

Using AI Code Generation

1var wpt = require('wpt');2var wptError = wpt.JpxError;3var wptError = new wpt.JpxError(1, 'test error');4console.log(wptError);5console.log(wptError.code);6console.log(wptError.message);7console.log(wptError.stack);8var jpx = require('jpx');9var jpxError = jpx.JpxError;10var jpxError = new jpx.JpxError(1, 'test error');11console.log(jpxError);12console.log(jpxError.code);13console.log(jpxError.message);14console.log(jpxError.stack);15var wpt = require('wpt');16var wptError = wpt.JpxError;17var wptError = new wpt.JpxError(1, 'test error');18console.log(wptError);19console.log(wptError.code);20console.log(wptError.message);21console.log(wptError.stack);22var jpx = require('jpx');23var jpxError = jpx.JpxError;24var jpxError = new jpx.JpxError(1, 'test error');25console.log(jpxError);26console.log(jpxError.code);27console.log(jpxError.message);28console.log(jpxError.stack);29var wpt = require('wpt');30var wptError = wpt.JpxError;31var wptError = new wpt.JpxError(1, 'test error');32console.log(wptError);33console.log(wptError.code);34console.log(wptError.message);35console.log(wptError.stack);36var jpx = require('jpx');37var jpxError = jpx.JpxError;38var jpxError = new jpx.JpxError(1, 'test error');39console.log(jpxError);40console.log(jpxError.code);41console.log(jpxError.message);42console.log(jpxError.stack);43var wpt = require('wpt');44var wptError = wpt.JpxError;

Using AI Code Generation

1var wpt = require('wpt');2var jpx = wpt.JpxError;3var err = new jpx('test error');4console.log(err.message);5var wpt = require('wpt');6var jpx = wpt.JpxError;7var err = new jpx('test error');8console.log(err.message);9var wpt = require('wpt');10var jpx = wpt.JpxError;11var err = new jpx('test error');12console.log(err.message);13var wpt = require('wpt');14var jpx = wpt.JpxError;15var err = new jpx('test error');16console.log(err.message);17var wpt = require('wpt');18var jpx = wpt.JpxError;19var err = new jpx('test error');20console.log(err.message);21var wpt = require('wpt');22var jpx = wpt.JpxError;23var err = new jpx('test error');24console.log(err.message);25var wpt = require('wpt');26var jpx = wpt.JpxError;27var err = new jpx('test error');28console.log(err.message);29var wpt = require('wpt');30var jpx = wpt.JpxError;31var err = new jpx('test error');32console.log(err.message);33var wpt = require('wpt');34var jpx = wpt.JpxError;35var err = new jpx('test error');36console.log(err.message);37var wpt = require('wpt');38var jpx = wpt.JpxError;

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.