| /** |
| * @licstart The following is the entire license notice for the |
| * Javascript code in this page |
| * |
| * Copyright 2020 Mozilla Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| * @licend The above is the entire license notice for the |
| * Javascript code in this page |
| */ |
| "use strict"; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| exports.JpxImage = void 0; |
| |
| var _util = require("../shared/util.js"); |
| |
| var _core_utils = require("./core_utils.js"); |
| |
| var _arithmetic_decoder = require("./arithmetic_decoder.js"); |
| |
| class JpxError extends _util.BaseException { |
| constructor(msg) { |
| super(`JPX error: ${msg}`); |
| } |
| |
| } |
| |
| var JpxImage = function JpxImageClosure() { |
| var SubbandsGainLog2 = { |
| LL: 0, |
| LH: 1, |
| HL: 1, |
| HH: 2 |
| }; |
| |
| function JpxImage() { |
| this.failOnCorruptedImage = false; |
| } |
| |
| JpxImage.prototype = { |
| parse: function JpxImage_parse(data) { |
| var head = (0, _core_utils.readUint16)(data, 0); |
| |
| if (head === 0xff4f) { |
| this.parseCodestream(data, 0, data.length); |
| return; |
| } |
| |
| var position = 0, |
| length = data.length; |
| |
| while (position < length) { |
| var headerSize = 8; |
| var lbox = (0, _core_utils.readUint32)(data, position); |
| var tbox = (0, _core_utils.readUint32)(data, position + 4); |
| position += headerSize; |
| |
| if (lbox === 1) { |
| lbox = (0, _core_utils.readUint32)(data, position) * 4294967296 + (0, _core_utils.readUint32)(data, position + 4); |
| position += 8; |
| headerSize += 8; |
| } |
| |
| if (lbox === 0) { |
| lbox = length - position + headerSize; |
| } |
| |
| if (lbox < headerSize) { |
| throw new JpxError("Invalid box field size"); |
| } |
| |
| var dataLength = lbox - headerSize; |
| var jumpDataLength = true; |
| |
| switch (tbox) { |
| case 0x6a703268: |
| jumpDataLength = false; |
| break; |
| |
| case 0x636f6c72: |
| var method = data[position]; |
| |
| if (method === 1) { |
| var colorspace = (0, _core_utils.readUint32)(data, position + 3); |
| |
| switch (colorspace) { |
| case 16: |
| case 17: |
| case 18: |
| break; |
| |
| default: |
| (0, _util.warn)("Unknown colorspace " + colorspace); |
| break; |
| } |
| } else if (method === 2) { |
| (0, _util.info)("ICC profile not supported"); |
| } |
| |
| break; |
| |
| case 0x6a703263: |
| this.parseCodestream(data, position, position + dataLength); |
| break; |
| |
| case 0x6a502020: |
| if ((0, _core_utils.readUint32)(data, position) !== 0x0d0a870a) { |
| (0, _util.warn)("Invalid JP2 signature"); |
| } |
| |
| break; |
| |
| case 0x6a501a1a: |
| case 0x66747970: |
| case 0x72726571: |
| case 0x72657320: |
| case 0x69686472: |
| break; |
| |
| default: |
| var headerType = String.fromCharCode(tbox >> 24 & 0xff, tbox >> 16 & 0xff, tbox >> 8 & 0xff, tbox & 0xff); |
| (0, _util.warn)("Unsupported header type " + tbox + " (" + headerType + ")"); |
| break; |
| } |
| |
| if (jumpDataLength) { |
| position += dataLength; |
| } |
| } |
| }, |
| parseImageProperties: function JpxImage_parseImageProperties(stream) { |
| var newByte = stream.getByte(); |
| |
| while (newByte >= 0) { |
| var oldByte = newByte; |
| newByte = stream.getByte(); |
| var code = oldByte << 8 | newByte; |
| |
| if (code === 0xff51) { |
| stream.skip(4); |
| var Xsiz = stream.getInt32() >>> 0; |
| var Ysiz = stream.getInt32() >>> 0; |
| var XOsiz = stream.getInt32() >>> 0; |
| var YOsiz = stream.getInt32() >>> 0; |
| stream.skip(16); |
| var Csiz = stream.getUint16(); |
| this.width = Xsiz - XOsiz; |
| this.height = Ysiz - YOsiz; |
| this.componentsCount = Csiz; |
| this.bitsPerComponent = 8; |
| return; |
| } |
| } |
| |
| throw new JpxError("No size marker found in JPX stream"); |
| }, |
| parseCodestream: function JpxImage_parseCodestream(data, start, end) { |
| var context = {}; |
| var doNotRecover = false; |
| |
| try { |
| var position = start; |
| |
| while (position + 1 < end) { |
| var code = (0, _core_utils.readUint16)(data, position); |
| position += 2; |
| var length = 0, |
| j, |
| sqcd, |
| spqcds, |
| spqcdSize, |
| scalarExpounded, |
| tile; |
| |
| switch (code) { |
| case 0xff4f: |
| context.mainHeader = true; |
| break; |
| |
| case 0xffd9: |
| break; |
| |
| case 0xff51: |
| length = (0, _core_utils.readUint16)(data, position); |
| var siz = {}; |
| siz.Xsiz = (0, _core_utils.readUint32)(data, position + 4); |
| siz.Ysiz = (0, _core_utils.readUint32)(data, position + 8); |
| siz.XOsiz = (0, _core_utils.readUint32)(data, position + 12); |
| siz.YOsiz = (0, _core_utils.readUint32)(data, position + 16); |
| siz.XTsiz = (0, _core_utils.readUint32)(data, position + 20); |
| siz.YTsiz = (0, _core_utils.readUint32)(data, position + 24); |
| siz.XTOsiz = (0, _core_utils.readUint32)(data, position + 28); |
| siz.YTOsiz = (0, _core_utils.readUint32)(data, position + 32); |
| var componentsCount = (0, _core_utils.readUint16)(data, position + 36); |
| siz.Csiz = componentsCount; |
| var components = []; |
| j = position + 38; |
| |
| for (var i = 0; i < componentsCount; i++) { |
| var component = { |
| precision: (data[j] & 0x7f) + 1, |
| isSigned: !!(data[j] & 0x80), |
| XRsiz: data[j + 1], |
| YRsiz: data[j + 2] |
| }; |
| j += 3; |
| calculateComponentDimensions(component, siz); |
| components.push(component); |
| } |
| |
| context.SIZ = siz; |
| context.components = components; |
| calculateTileGrids(context, components); |
| context.QCC = []; |
| context.COC = []; |
| break; |
| |
| case 0xff5c: |
| length = (0, _core_utils.readUint16)(data, position); |
| var qcd = {}; |
| j = position + 2; |
| sqcd = data[j++]; |
| |
| switch (sqcd & 0x1f) { |
| case 0: |
| spqcdSize = 8; |
| scalarExpounded = true; |
| break; |
| |
| case 1: |
| spqcdSize = 16; |
| scalarExpounded = false; |
| break; |
| |
| case 2: |
| spqcdSize = 16; |
| scalarExpounded = true; |
| break; |
| |
| default: |
| throw new Error("Invalid SQcd value " + sqcd); |
| } |
| |
| qcd.noQuantization = spqcdSize === 8; |
| qcd.scalarExpounded = scalarExpounded; |
| qcd.guardBits = sqcd >> 5; |
| spqcds = []; |
| |
| while (j < length + position) { |
| var spqcd = {}; |
| |
| if (spqcdSize === 8) { |
| spqcd.epsilon = data[j++] >> 3; |
| spqcd.mu = 0; |
| } else { |
| spqcd.epsilon = data[j] >> 3; |
| spqcd.mu = (data[j] & 0x7) << 8 | data[j + 1]; |
| j += 2; |
| } |
| |
| spqcds.push(spqcd); |
| } |
| |
| qcd.SPqcds = spqcds; |
| |
| if (context.mainHeader) { |
| context.QCD = qcd; |
| } else { |
| context.currentTile.QCD = qcd; |
| context.currentTile.QCC = []; |
| } |
| |
| break; |
| |
| case 0xff5d: |
| length = (0, _core_utils.readUint16)(data, position); |
| var qcc = {}; |
| j = position + 2; |
| var cqcc; |
| |
| if (context.SIZ.Csiz < 257) { |
| cqcc = data[j++]; |
| } else { |
| cqcc = (0, _core_utils.readUint16)(data, j); |
| j += 2; |
| } |
| |
| sqcd = data[j++]; |
| |
| switch (sqcd & 0x1f) { |
| case 0: |
| spqcdSize = 8; |
| scalarExpounded = true; |
| break; |
| |
| case 1: |
| spqcdSize = 16; |
| scalarExpounded = false; |
| break; |
| |
| case 2: |
| spqcdSize = 16; |
| scalarExpounded = true; |
| break; |
| |
| default: |
| throw new Error("Invalid SQcd value " + sqcd); |
| } |
| |
| qcc.noQuantization = spqcdSize === 8; |
| qcc.scalarExpounded = scalarExpounded; |
| qcc.guardBits = sqcd >> 5; |
| spqcds = []; |
| |
| while (j < length + position) { |
| spqcd = {}; |
| |
| if (spqcdSize === 8) { |
| spqcd.epsilon = data[j++] >> 3; |
| spqcd.mu = 0; |
| } else { |
| spqcd.epsilon = data[j] >> 3; |
| spqcd.mu = (data[j] & 0x7) << 8 | data[j + 1]; |
| j += 2; |
| } |
| |
| spqcds.push(spqcd); |
| } |
| |
| qcc.SPqcds = spqcds; |
| |
| if (context.mainHeader) { |
| context.QCC[cqcc] = qcc; |
| } else { |
| context.currentTile.QCC[cqcc] = qcc; |
| } |
| |
| break; |
| |
| case 0xff52: |
| length = (0, _core_utils.readUint16)(data, position); |
| var cod = {}; |
| j = position + 2; |
| var scod = data[j++]; |
| cod.entropyCoderWithCustomPrecincts = !!(scod & 1); |
| cod.sopMarkerUsed = !!(scod & 2); |
| cod.ephMarkerUsed = !!(scod & 4); |
| cod.progressionOrder = data[j++]; |
| cod.layersCount = (0, _core_utils.readUint16)(data, j); |
| j += 2; |
| cod.multipleComponentTransform = data[j++]; |
| cod.decompositionLevelsCount = data[j++]; |
| cod.xcb = (data[j++] & 0xf) + 2; |
| cod.ycb = (data[j++] & 0xf) + 2; |
| var blockStyle = data[j++]; |
| cod.selectiveArithmeticCodingBypass = !!(blockStyle & 1); |
| cod.resetContextProbabilities = !!(blockStyle & 2); |
| cod.terminationOnEachCodingPass = !!(blockStyle & 4); |
| cod.verticallyStripe = !!(blockStyle & 8); |
| cod.predictableTermination = !!(blockStyle & 16); |
| cod.segmentationSymbolUsed = !!(blockStyle & 32); |
| cod.reversibleTransformation = data[j++]; |
| |
| if (cod.entropyCoderWithCustomPrecincts) { |
| var precinctsSizes = []; |
| |
| while (j < length + position) { |
| var precinctsSize = data[j++]; |
| precinctsSizes.push({ |
| PPx: precinctsSize & 0xf, |
| PPy: precinctsSize >> 4 |
| }); |
| } |
| |
| cod.precinctsSizes = precinctsSizes; |
| } |
| |
| var unsupported = []; |
| |
| if (cod.selectiveArithmeticCodingBypass) { |
| unsupported.push("selectiveArithmeticCodingBypass"); |
| } |
| |
| if (cod.resetContextProbabilities) { |
| unsupported.push("resetContextProbabilities"); |
| } |
| |
| if (cod.terminationOnEachCodingPass) { |
| unsupported.push("terminationOnEachCodingPass"); |
| } |
| |
| if (cod.verticallyStripe) { |
| unsupported.push("verticallyStripe"); |
| } |
| |
| if (cod.predictableTermination) { |
| unsupported.push("predictableTermination"); |
| } |
| |
| if (unsupported.length > 0) { |
| doNotRecover = true; |
| throw new Error("Unsupported COD options (" + unsupported.join(", ") + ")"); |
| } |
| |
| if (context.mainHeader) { |
| context.COD = cod; |
| } else { |
| context.currentTile.COD = cod; |
| context.currentTile.COC = []; |
| } |
| |
| break; |
| |
| case 0xff90: |
| length = (0, _core_utils.readUint16)(data, position); |
| tile = {}; |
| tile.index = (0, _core_utils.readUint16)(data, position + 2); |
| tile.length = (0, _core_utils.readUint32)(data, position + 4); |
| tile.dataEnd = tile.length + position - 2; |
| tile.partIndex = data[position + 8]; |
| tile.partsCount = data[position + 9]; |
| context.mainHeader = false; |
| |
| if (tile.partIndex === 0) { |
| tile.COD = context.COD; |
| tile.COC = context.COC.slice(0); |
| tile.QCD = context.QCD; |
| tile.QCC = context.QCC.slice(0); |
| } |
| |
| context.currentTile = tile; |
| break; |
| |
| case 0xff93: |
| tile = context.currentTile; |
| |
| if (tile.partIndex === 0) { |
| initializeTile(context, tile.index); |
| buildPackets(context); |
| } |
| |
| length = tile.dataEnd - position; |
| parseTilePackets(context, data, position, length); |
| break; |
| |
| case 0xff55: |
| case 0xff57: |
| case 0xff58: |
| case 0xff64: |
| length = (0, _core_utils.readUint16)(data, position); |
| break; |
| |
| case 0xff53: |
| throw new Error("Codestream code 0xFF53 (COC) is not implemented"); |
| |
| default: |
| throw new Error("Unknown codestream code: " + code.toString(16)); |
| } |
| |
| position += length; |
| } |
| } catch (e) { |
| if (doNotRecover || this.failOnCorruptedImage) { |
| throw new JpxError(e.message); |
| } else { |
| (0, _util.warn)("JPX: Trying to recover from: " + e.message); |
| } |
| } |
| |
| this.tiles = transformComponents(context); |
| this.width = context.SIZ.Xsiz - context.SIZ.XOsiz; |
| this.height = context.SIZ.Ysiz - context.SIZ.YOsiz; |
| this.componentsCount = context.SIZ.Csiz; |
| } |
| }; |
| |
| function calculateComponentDimensions(component, siz) { |
| component.x0 = Math.ceil(siz.XOsiz / component.XRsiz); |
| component.x1 = Math.ceil(siz.Xsiz / component.XRsiz); |
| component.y0 = Math.ceil(siz.YOsiz / component.YRsiz); |
| component.y1 = Math.ceil(siz.Ysiz / component.YRsiz); |
| component.width = component.x1 - component.x0; |
| component.height = component.y1 - component.y0; |
| } |
| |
| function calculateTileGrids(context, components) { |
| var siz = context.SIZ; |
| var tile, |
| tiles = []; |
| var numXtiles = Math.ceil((siz.Xsiz - siz.XTOsiz) / siz.XTsiz); |
| var numYtiles = Math.ceil((siz.Ysiz - siz.YTOsiz) / siz.YTsiz); |
| |
| for (var q = 0; q < numYtiles; q++) { |
| for (var p = 0; p < numXtiles; p++) { |
| tile = {}; |
| tile.tx0 = Math.max(siz.XTOsiz + p * siz.XTsiz, siz.XOsiz); |
| tile.ty0 = Math.max(siz.YTOsiz + q * siz.YTsiz, siz.YOsiz); |
| tile.tx1 = Math.min(siz.XTOsiz + (p + 1) * siz.XTsiz, siz.Xsiz); |
| tile.ty1 = Math.min(siz.YTOsiz + (q + 1) * siz.YTsiz, siz.Ysiz); |
| tile.width = tile.tx1 - tile.tx0; |
| tile.height = tile.ty1 - tile.ty0; |
| tile.components = []; |
| tiles.push(tile); |
| } |
| } |
| |
| context.tiles = tiles; |
| var componentsCount = siz.Csiz; |
| |
| for (var i = 0, ii = componentsCount; i < ii; i++) { |
| var component = components[i]; |
| |
| for (var j = 0, jj = tiles.length; j < jj; j++) { |
| var tileComponent = {}; |
| tile = tiles[j]; |
| tileComponent.tcx0 = Math.ceil(tile.tx0 / component.XRsiz); |
| tileComponent.tcy0 = Math.ceil(tile.ty0 / component.YRsiz); |
| tileComponent.tcx1 = Math.ceil(tile.tx1 / component.XRsiz); |
| tileComponent.tcy1 = Math.ceil(tile.ty1 / component.YRsiz); |
| tileComponent.width = tileComponent.tcx1 - tileComponent.tcx0; |
| tileComponent.height = tileComponent.tcy1 - tileComponent.tcy0; |
| tile.components[i] = tileComponent; |
| } |
| } |
| } |
| |
| function getBlocksDimensions(context, component, r) { |
| var codOrCoc = component.codingStyleParameters; |
| var result = {}; |
| |
| if (!codOrCoc.entropyCoderWithCustomPrecincts) { |
| result.PPx = 15; |
| result.PPy = 15; |
| } else { |
| result.PPx = codOrCoc.precinctsSizes[r].PPx; |
| result.PPy = codOrCoc.precinctsSizes[r].PPy; |
| } |
| |
| result.xcb_ = r > 0 ? Math.min(codOrCoc.xcb, result.PPx - 1) : Math.min(codOrCoc.xcb, result.PPx); |
| result.ycb_ = r > 0 ? Math.min(codOrCoc.ycb, result.PPy - 1) : Math.min(codOrCoc.ycb, result.PPy); |
| return result; |
| } |
| |
| function buildPrecincts(context, resolution, dimensions) { |
| var precinctWidth = 1 << dimensions.PPx; |
| var precinctHeight = 1 << dimensions.PPy; |
| var isZeroRes = resolution.resLevel === 0; |
| var precinctWidthInSubband = 1 << dimensions.PPx + (isZeroRes ? 0 : -1); |
| var precinctHeightInSubband = 1 << dimensions.PPy + (isZeroRes ? 0 : -1); |
| var numprecinctswide = resolution.trx1 > resolution.trx0 ? Math.ceil(resolution.trx1 / precinctWidth) - Math.floor(resolution.trx0 / precinctWidth) : 0; |
| var numprecinctshigh = resolution.try1 > resolution.try0 ? Math.ceil(resolution.try1 / precinctHeight) - Math.floor(resolution.try0 / precinctHeight) : 0; |
| var numprecincts = numprecinctswide * numprecinctshigh; |
| resolution.precinctParameters = { |
| precinctWidth, |
| precinctHeight, |
| numprecinctswide, |
| numprecinctshigh, |
| numprecincts, |
| precinctWidthInSubband, |
| precinctHeightInSubband |
| }; |
| } |
| |
| function buildCodeblocks(context, subband, dimensions) { |
| var xcb_ = dimensions.xcb_; |
| var ycb_ = dimensions.ycb_; |
| var codeblockWidth = 1 << xcb_; |
| var codeblockHeight = 1 << ycb_; |
| var cbx0 = subband.tbx0 >> xcb_; |
| var cby0 = subband.tby0 >> ycb_; |
| var cbx1 = subband.tbx1 + codeblockWidth - 1 >> xcb_; |
| var cby1 = subband.tby1 + codeblockHeight - 1 >> ycb_; |
| var precinctParameters = subband.resolution.precinctParameters; |
| var codeblocks = []; |
| var precincts = []; |
| var i, j, codeblock, precinctNumber; |
| |
| for (j = cby0; j < cby1; j++) { |
| for (i = cbx0; i < cbx1; i++) { |
| codeblock = { |
| cbx: i, |
| cby: j, |
| tbx0: codeblockWidth * i, |
| tby0: codeblockHeight * j, |
| tbx1: codeblockWidth * (i + 1), |
| tby1: codeblockHeight * (j + 1) |
| }; |
| codeblock.tbx0_ = Math.max(subband.tbx0, codeblock.tbx0); |
| codeblock.tby0_ = Math.max(subband.tby0, codeblock.tby0); |
| codeblock.tbx1_ = Math.min(subband.tbx1, codeblock.tbx1); |
| codeblock.tby1_ = Math.min(subband.tby1, codeblock.tby1); |
| var pi = Math.floor((codeblock.tbx0_ - subband.tbx0) / precinctParameters.precinctWidthInSubband); |
| var pj = Math.floor((codeblock.tby0_ - subband.tby0) / precinctParameters.precinctHeightInSubband); |
| precinctNumber = pi + pj * precinctParameters.numprecinctswide; |
| codeblock.precinctNumber = precinctNumber; |
| codeblock.subbandType = subband.type; |
| codeblock.Lblock = 3; |
| |
| if (codeblock.tbx1_ <= codeblock.tbx0_ || codeblock.tby1_ <= codeblock.tby0_) { |
| continue; |
| } |
| |
| codeblocks.push(codeblock); |
| var precinct = precincts[precinctNumber]; |
| |
| if (precinct !== undefined) { |
| if (i < precinct.cbxMin) { |
| precinct.cbxMin = i; |
| } else if (i > precinct.cbxMax) { |
| precinct.cbxMax = i; |
| } |
| |
| if (j < precinct.cbyMin) { |
| precinct.cbxMin = j; |
| } else if (j > precinct.cbyMax) { |
| precinct.cbyMax = j; |
| } |
| } else { |
| precincts[precinctNumber] = precinct = { |
| cbxMin: i, |
| cbyMin: j, |
| cbxMax: i, |
| cbyMax: j |
| }; |
| } |
| |
| codeblock.precinct = precinct; |
| } |
| } |
| |
| subband.codeblockParameters = { |
| codeblockWidth: xcb_, |
| codeblockHeight: ycb_, |
| numcodeblockwide: cbx1 - cbx0 + 1, |
| numcodeblockhigh: cby1 - cby0 + 1 |
| }; |
| subband.codeblocks = codeblocks; |
| subband.precincts = precincts; |
| } |
| |
| function createPacket(resolution, precinctNumber, layerNumber) { |
| var precinctCodeblocks = []; |
| var subbands = resolution.subbands; |
| |
| for (var i = 0, ii = subbands.length; i < ii; i++) { |
| var subband = subbands[i]; |
| var codeblocks = subband.codeblocks; |
| |
| for (var j = 0, jj = codeblocks.length; j < jj; j++) { |
| var codeblock = codeblocks[j]; |
| |
| if (codeblock.precinctNumber !== precinctNumber) { |
| continue; |
| } |
| |
| precinctCodeblocks.push(codeblock); |
| } |
| } |
| |
| return { |
| layerNumber, |
| codeblocks: precinctCodeblocks |
| }; |
| } |
| |
| function LayerResolutionComponentPositionIterator(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var layersCount = tile.codingStyleDefaultParameters.layersCount; |
| var componentsCount = siz.Csiz; |
| var maxDecompositionLevelsCount = 0; |
| |
| for (var q = 0; q < componentsCount; q++) { |
| maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, tile.components[q].codingStyleParameters.decompositionLevelsCount); |
| } |
| |
| var l = 0, |
| r = 0, |
| i = 0, |
| k = 0; |
| |
| this.nextPacket = function JpxImage_nextPacket() { |
| for (; l < layersCount; l++) { |
| for (; r <= maxDecompositionLevelsCount; r++) { |
| for (; i < componentsCount; i++) { |
| var component = tile.components[i]; |
| |
| if (r > component.codingStyleParameters.decompositionLevelsCount) { |
| continue; |
| } |
| |
| var resolution = component.resolutions[r]; |
| var numprecincts = resolution.precinctParameters.numprecincts; |
| |
| for (; k < numprecincts;) { |
| var packet = createPacket(resolution, k, l); |
| k++; |
| return packet; |
| } |
| |
| k = 0; |
| } |
| |
| i = 0; |
| } |
| |
| r = 0; |
| } |
| |
| throw new JpxError("Out of packets"); |
| }; |
| } |
| |
| function ResolutionLayerComponentPositionIterator(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var layersCount = tile.codingStyleDefaultParameters.layersCount; |
| var componentsCount = siz.Csiz; |
| var maxDecompositionLevelsCount = 0; |
| |
| for (var q = 0; q < componentsCount; q++) { |
| maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, tile.components[q].codingStyleParameters.decompositionLevelsCount); |
| } |
| |
| var r = 0, |
| l = 0, |
| i = 0, |
| k = 0; |
| |
| this.nextPacket = function JpxImage_nextPacket() { |
| for (; r <= maxDecompositionLevelsCount; r++) { |
| for (; l < layersCount; l++) { |
| for (; i < componentsCount; i++) { |
| var component = tile.components[i]; |
| |
| if (r > component.codingStyleParameters.decompositionLevelsCount) { |
| continue; |
| } |
| |
| var resolution = component.resolutions[r]; |
| var numprecincts = resolution.precinctParameters.numprecincts; |
| |
| for (; k < numprecincts;) { |
| var packet = createPacket(resolution, k, l); |
| k++; |
| return packet; |
| } |
| |
| k = 0; |
| } |
| |
| i = 0; |
| } |
| |
| l = 0; |
| } |
| |
| throw new JpxError("Out of packets"); |
| }; |
| } |
| |
| function ResolutionPositionComponentLayerIterator(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var layersCount = tile.codingStyleDefaultParameters.layersCount; |
| var componentsCount = siz.Csiz; |
| var l, r, c, p; |
| var maxDecompositionLevelsCount = 0; |
| |
| for (c = 0; c < componentsCount; c++) { |
| const component = tile.components[c]; |
| maxDecompositionLevelsCount = Math.max(maxDecompositionLevelsCount, component.codingStyleParameters.decompositionLevelsCount); |
| } |
| |
| var maxNumPrecinctsInLevel = new Int32Array(maxDecompositionLevelsCount + 1); |
| |
| for (r = 0; r <= maxDecompositionLevelsCount; ++r) { |
| var maxNumPrecincts = 0; |
| |
| for (c = 0; c < componentsCount; ++c) { |
| var resolutions = tile.components[c].resolutions; |
| |
| if (r < resolutions.length) { |
| maxNumPrecincts = Math.max(maxNumPrecincts, resolutions[r].precinctParameters.numprecincts); |
| } |
| } |
| |
| maxNumPrecinctsInLevel[r] = maxNumPrecincts; |
| } |
| |
| l = 0; |
| r = 0; |
| c = 0; |
| p = 0; |
| |
| this.nextPacket = function JpxImage_nextPacket() { |
| for (; r <= maxDecompositionLevelsCount; r++) { |
| for (; p < maxNumPrecinctsInLevel[r]; p++) { |
| for (; c < componentsCount; c++) { |
| const component = tile.components[c]; |
| |
| if (r > component.codingStyleParameters.decompositionLevelsCount) { |
| continue; |
| } |
| |
| var resolution = component.resolutions[r]; |
| var numprecincts = resolution.precinctParameters.numprecincts; |
| |
| if (p >= numprecincts) { |
| continue; |
| } |
| |
| for (; l < layersCount;) { |
| var packet = createPacket(resolution, p, l); |
| l++; |
| return packet; |
| } |
| |
| l = 0; |
| } |
| |
| c = 0; |
| } |
| |
| p = 0; |
| } |
| |
| throw new JpxError("Out of packets"); |
| }; |
| } |
| |
| function PositionComponentResolutionLayerIterator(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var layersCount = tile.codingStyleDefaultParameters.layersCount; |
| var componentsCount = siz.Csiz; |
| var precinctsSizes = getPrecinctSizesInImageScale(tile); |
| var precinctsIterationSizes = precinctsSizes; |
| var l = 0, |
| r = 0, |
| c = 0, |
| px = 0, |
| py = 0; |
| |
| this.nextPacket = function JpxImage_nextPacket() { |
| for (; py < precinctsIterationSizes.maxNumHigh; py++) { |
| for (; px < precinctsIterationSizes.maxNumWide; px++) { |
| for (; c < componentsCount; c++) { |
| var component = tile.components[c]; |
| var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount; |
| |
| for (; r <= decompositionLevelsCount; r++) { |
| var resolution = component.resolutions[r]; |
| var sizeInImageScale = precinctsSizes.components[c].resolutions[r]; |
| var k = getPrecinctIndexIfExist(px, py, sizeInImageScale, precinctsIterationSizes, resolution); |
| |
| if (k === null) { |
| continue; |
| } |
| |
| for (; l < layersCount;) { |
| var packet = createPacket(resolution, k, l); |
| l++; |
| return packet; |
| } |
| |
| l = 0; |
| } |
| |
| r = 0; |
| } |
| |
| c = 0; |
| } |
| |
| px = 0; |
| } |
| |
| throw new JpxError("Out of packets"); |
| }; |
| } |
| |
| function ComponentPositionResolutionLayerIterator(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var layersCount = tile.codingStyleDefaultParameters.layersCount; |
| var componentsCount = siz.Csiz; |
| var precinctsSizes = getPrecinctSizesInImageScale(tile); |
| var l = 0, |
| r = 0, |
| c = 0, |
| px = 0, |
| py = 0; |
| |
| this.nextPacket = function JpxImage_nextPacket() { |
| for (; c < componentsCount; ++c) { |
| var component = tile.components[c]; |
| var precinctsIterationSizes = precinctsSizes.components[c]; |
| var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount; |
| |
| for (; py < precinctsIterationSizes.maxNumHigh; py++) { |
| for (; px < precinctsIterationSizes.maxNumWide; px++) { |
| for (; r <= decompositionLevelsCount; r++) { |
| var resolution = component.resolutions[r]; |
| var sizeInImageScale = precinctsIterationSizes.resolutions[r]; |
| var k = getPrecinctIndexIfExist(px, py, sizeInImageScale, precinctsIterationSizes, resolution); |
| |
| if (k === null) { |
| continue; |
| } |
| |
| for (; l < layersCount;) { |
| var packet = createPacket(resolution, k, l); |
| l++; |
| return packet; |
| } |
| |
| l = 0; |
| } |
| |
| r = 0; |
| } |
| |
| px = 0; |
| } |
| |
| py = 0; |
| } |
| |
| throw new JpxError("Out of packets"); |
| }; |
| } |
| |
| function getPrecinctIndexIfExist(pxIndex, pyIndex, sizeInImageScale, precinctIterationSizes, resolution) { |
| var posX = pxIndex * precinctIterationSizes.minWidth; |
| var posY = pyIndex * precinctIterationSizes.minHeight; |
| |
| if (posX % sizeInImageScale.width !== 0 || posY % sizeInImageScale.height !== 0) { |
| return null; |
| } |
| |
| var startPrecinctRowIndex = posY / sizeInImageScale.width * resolution.precinctParameters.numprecinctswide; |
| return posX / sizeInImageScale.height + startPrecinctRowIndex; |
| } |
| |
| function getPrecinctSizesInImageScale(tile) { |
| var componentsCount = tile.components.length; |
| var minWidth = Number.MAX_VALUE; |
| var minHeight = Number.MAX_VALUE; |
| var maxNumWide = 0; |
| var maxNumHigh = 0; |
| var sizePerComponent = new Array(componentsCount); |
| |
| for (var c = 0; c < componentsCount; c++) { |
| var component = tile.components[c]; |
| var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount; |
| var sizePerResolution = new Array(decompositionLevelsCount + 1); |
| var minWidthCurrentComponent = Number.MAX_VALUE; |
| var minHeightCurrentComponent = Number.MAX_VALUE; |
| var maxNumWideCurrentComponent = 0; |
| var maxNumHighCurrentComponent = 0; |
| var scale = 1; |
| |
| for (var r = decompositionLevelsCount; r >= 0; --r) { |
| var resolution = component.resolutions[r]; |
| var widthCurrentResolution = scale * resolution.precinctParameters.precinctWidth; |
| var heightCurrentResolution = scale * resolution.precinctParameters.precinctHeight; |
| minWidthCurrentComponent = Math.min(minWidthCurrentComponent, widthCurrentResolution); |
| minHeightCurrentComponent = Math.min(minHeightCurrentComponent, heightCurrentResolution); |
| maxNumWideCurrentComponent = Math.max(maxNumWideCurrentComponent, resolution.precinctParameters.numprecinctswide); |
| maxNumHighCurrentComponent = Math.max(maxNumHighCurrentComponent, resolution.precinctParameters.numprecinctshigh); |
| sizePerResolution[r] = { |
| width: widthCurrentResolution, |
| height: heightCurrentResolution |
| }; |
| scale <<= 1; |
| } |
| |
| minWidth = Math.min(minWidth, minWidthCurrentComponent); |
| minHeight = Math.min(minHeight, minHeightCurrentComponent); |
| maxNumWide = Math.max(maxNumWide, maxNumWideCurrentComponent); |
| maxNumHigh = Math.max(maxNumHigh, maxNumHighCurrentComponent); |
| sizePerComponent[c] = { |
| resolutions: sizePerResolution, |
| minWidth: minWidthCurrentComponent, |
| minHeight: minHeightCurrentComponent, |
| maxNumWide: maxNumWideCurrentComponent, |
| maxNumHigh: maxNumHighCurrentComponent |
| }; |
| } |
| |
| return { |
| components: sizePerComponent, |
| minWidth, |
| minHeight, |
| maxNumWide, |
| maxNumHigh |
| }; |
| } |
| |
| function buildPackets(context) { |
| var siz = context.SIZ; |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var componentsCount = siz.Csiz; |
| |
| for (var c = 0; c < componentsCount; c++) { |
| var component = tile.components[c]; |
| var decompositionLevelsCount = component.codingStyleParameters.decompositionLevelsCount; |
| var resolutions = []; |
| var subbands = []; |
| |
| for (var r = 0; r <= decompositionLevelsCount; r++) { |
| var blocksDimensions = getBlocksDimensions(context, component, r); |
| var resolution = {}; |
| var scale = 1 << decompositionLevelsCount - r; |
| resolution.trx0 = Math.ceil(component.tcx0 / scale); |
| resolution.try0 = Math.ceil(component.tcy0 / scale); |
| resolution.trx1 = Math.ceil(component.tcx1 / scale); |
| resolution.try1 = Math.ceil(component.tcy1 / scale); |
| resolution.resLevel = r; |
| buildPrecincts(context, resolution, blocksDimensions); |
| resolutions.push(resolution); |
| var subband; |
| |
| if (r === 0) { |
| subband = {}; |
| subband.type = "LL"; |
| subband.tbx0 = Math.ceil(component.tcx0 / scale); |
| subband.tby0 = Math.ceil(component.tcy0 / scale); |
| subband.tbx1 = Math.ceil(component.tcx1 / scale); |
| subband.tby1 = Math.ceil(component.tcy1 / scale); |
| subband.resolution = resolution; |
| buildCodeblocks(context, subband, blocksDimensions); |
| subbands.push(subband); |
| resolution.subbands = [subband]; |
| } else { |
| var bscale = 1 << decompositionLevelsCount - r + 1; |
| var resolutionSubbands = []; |
| subband = {}; |
| subband.type = "HL"; |
| subband.tbx0 = Math.ceil(component.tcx0 / bscale - 0.5); |
| subband.tby0 = Math.ceil(component.tcy0 / bscale); |
| subband.tbx1 = Math.ceil(component.tcx1 / bscale - 0.5); |
| subband.tby1 = Math.ceil(component.tcy1 / bscale); |
| subband.resolution = resolution; |
| buildCodeblocks(context, subband, blocksDimensions); |
| subbands.push(subband); |
| resolutionSubbands.push(subband); |
| subband = {}; |
| subband.type = "LH"; |
| subband.tbx0 = Math.ceil(component.tcx0 / bscale); |
| subband.tby0 = Math.ceil(component.tcy0 / bscale - 0.5); |
| subband.tbx1 = Math.ceil(component.tcx1 / bscale); |
| subband.tby1 = Math.ceil(component.tcy1 / bscale - 0.5); |
| subband.resolution = resolution; |
| buildCodeblocks(context, subband, blocksDimensions); |
| subbands.push(subband); |
| resolutionSubbands.push(subband); |
| subband = {}; |
| subband.type = "HH"; |
| subband.tbx0 = Math.ceil(component.tcx0 / bscale - 0.5); |
| subband.tby0 = Math.ceil(component.tcy0 / bscale - 0.5); |
| subband.tbx1 = Math.ceil(component.tcx1 / bscale - 0.5); |
| subband.tby1 = Math.ceil(component.tcy1 / bscale - 0.5); |
| subband.resolution = resolution; |
| buildCodeblocks(context, subband, blocksDimensions); |
| subbands.push(subband); |
| resolutionSubbands.push(subband); |
| resolution.subbands = resolutionSubbands; |
| } |
| } |
| |
| component.resolutions = resolutions; |
| component.subbands = subbands; |
| } |
| |
| var progressionOrder = tile.codingStyleDefaultParameters.progressionOrder; |
| |
| switch (progressionOrder) { |
| case 0: |
| tile.packetsIterator = new LayerResolutionComponentPositionIterator(context); |
| break; |
| |
| case 1: |
| tile.packetsIterator = new ResolutionLayerComponentPositionIterator(context); |
| break; |
| |
| case 2: |
| tile.packetsIterator = new ResolutionPositionComponentLayerIterator(context); |
| break; |
| |
| case 3: |
| tile.packetsIterator = new PositionComponentResolutionLayerIterator(context); |
| break; |
| |
| case 4: |
| tile.packetsIterator = new ComponentPositionResolutionLayerIterator(context); |
| break; |
| |
| default: |
| throw new JpxError(`Unsupported progression order ${progressionOrder}`); |
| } |
| } |
| |
| function parseTilePackets(context, data, offset, dataLength) { |
| var position = 0; |
| var buffer, |
| bufferSize = 0, |
| skipNextBit = false; |
| |
| function readBits(count) { |
| while (bufferSize < count) { |
| var b = data[offset + position]; |
| position++; |
| |
| if (skipNextBit) { |
| buffer = buffer << 7 | b; |
| bufferSize += 7; |
| skipNextBit = false; |
| } else { |
| buffer = buffer << 8 | b; |
| bufferSize += 8; |
| } |
| |
| if (b === 0xff) { |
| skipNextBit = true; |
| } |
| } |
| |
| bufferSize -= count; |
| return buffer >>> bufferSize & (1 << count) - 1; |
| } |
| |
| function skipMarkerIfEqual(value) { |
| if (data[offset + position - 1] === 0xff && data[offset + position] === value) { |
| skipBytes(1); |
| return true; |
| } else if (data[offset + position] === 0xff && data[offset + position + 1] === value) { |
| skipBytes(2); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| function skipBytes(count) { |
| position += count; |
| } |
| |
| function alignToByte() { |
| bufferSize = 0; |
| |
| if (skipNextBit) { |
| position++; |
| skipNextBit = false; |
| } |
| } |
| |
| function readCodingpasses() { |
| if (readBits(1) === 0) { |
| return 1; |
| } |
| |
| if (readBits(1) === 0) { |
| return 2; |
| } |
| |
| var value = readBits(2); |
| |
| if (value < 3) { |
| return value + 3; |
| } |
| |
| value = readBits(5); |
| |
| if (value < 31) { |
| return value + 6; |
| } |
| |
| value = readBits(7); |
| return value + 37; |
| } |
| |
| var tileIndex = context.currentTile.index; |
| var tile = context.tiles[tileIndex]; |
| var sopMarkerUsed = context.COD.sopMarkerUsed; |
| var ephMarkerUsed = context.COD.ephMarkerUsed; |
| var packetsIterator = tile.packetsIterator; |
| |
| while (position < dataLength) { |
| alignToByte(); |
| |
| if (sopMarkerUsed && skipMarkerIfEqual(0x91)) { |
| skipBytes(4); |
| } |
| |
| var packet = packetsIterator.nextPacket(); |
| |
| if (!readBits(1)) { |
| continue; |
| } |
| |
| var layerNumber = packet.layerNumber; |
| var queue = [], |
| codeblock; |
| |
| for (var i = 0, ii = packet.codeblocks.length; i < ii; i++) { |
| codeblock = packet.codeblocks[i]; |
| var precinct = codeblock.precinct; |
| var codeblockColumn = codeblock.cbx - precinct.cbxMin; |
| var codeblockRow = codeblock.cby - precinct.cbyMin; |
| var codeblockIncluded = false; |
| var firstTimeInclusion = false; |
| var valueReady; |
| |
| if (codeblock.included !== undefined) { |
| codeblockIncluded = !!readBits(1); |
| } else { |
| precinct = codeblock.precinct; |
| var inclusionTree, zeroBitPlanesTree; |
| |
| if (precinct.inclusionTree !== undefined) { |
| inclusionTree = precinct.inclusionTree; |
| } else { |
| var width = precinct.cbxMax - precinct.cbxMin + 1; |
| var height = precinct.cbyMax - precinct.cbyMin + 1; |
| inclusionTree = new InclusionTree(width, height, layerNumber); |
| zeroBitPlanesTree = new TagTree(width, height); |
| precinct.inclusionTree = inclusionTree; |
| precinct.zeroBitPlanesTree = zeroBitPlanesTree; |
| } |
| |
| if (inclusionTree.reset(codeblockColumn, codeblockRow, layerNumber)) { |
| while (true) { |
| if (readBits(1)) { |
| valueReady = !inclusionTree.nextLevel(); |
| |
| if (valueReady) { |
| codeblock.included = true; |
| codeblockIncluded = firstTimeInclusion = true; |
| break; |
| } |
| } else { |
| inclusionTree.incrementValue(layerNumber); |
| break; |
| } |
| } |
| } |
| } |
| |
| if (!codeblockIncluded) { |
| continue; |
| } |
| |
| if (firstTimeInclusion) { |
| zeroBitPlanesTree = precinct.zeroBitPlanesTree; |
| zeroBitPlanesTree.reset(codeblockColumn, codeblockRow); |
| |
| while (true) { |
| if (readBits(1)) { |
| valueReady = !zeroBitPlanesTree.nextLevel(); |
| |
| if (valueReady) { |
| break; |
| } |
| } else { |
| zeroBitPlanesTree.incrementValue(); |
| } |
| } |
| |
| codeblock.zeroBitPlanes = zeroBitPlanesTree.value; |
| } |
| |
| var codingpasses = readCodingpasses(); |
| |
| while (readBits(1)) { |
| codeblock.Lblock++; |
| } |
| |
| var codingpassesLog2 = (0, _core_utils.log2)(codingpasses); |
| var bits = (codingpasses < 1 << codingpassesLog2 ? codingpassesLog2 - 1 : codingpassesLog2) + codeblock.Lblock; |
| var codedDataLength = readBits(bits); |
| queue.push({ |
| codeblock, |
| codingpasses, |
| dataLength: codedDataLength |
| }); |
| } |
| |
| alignToByte(); |
| |
| if (ephMarkerUsed) { |
| skipMarkerIfEqual(0x92); |
| } |
| |
| while (queue.length > 0) { |
| var packetItem = queue.shift(); |
| codeblock = packetItem.codeblock; |
| |
| if (codeblock.data === undefined) { |
| codeblock.data = []; |
| } |
| |
| codeblock.data.push({ |
| data, |
| start: offset + position, |
| end: offset + position + packetItem.dataLength, |
| codingpasses: packetItem.codingpasses |
| }); |
| position += packetItem.dataLength; |
| } |
| } |
| |
| return position; |
| } |
| |
| function copyCoefficients(coefficients, levelWidth, levelHeight, subband, delta, mb, reversible, segmentationSymbolUsed) { |
| var x0 = subband.tbx0; |
| var y0 = subband.tby0; |
| var width = subband.tbx1 - subband.tbx0; |
| var codeblocks = subband.codeblocks; |
| var right = subband.type.charAt(0) === "H" ? 1 : 0; |
| var bottom = subband.type.charAt(1) === "H" ? levelWidth : 0; |
| |
| for (var i = 0, ii = codeblocks.length; i < ii; ++i) { |
| var codeblock = codeblocks[i]; |
| var blockWidth = codeblock.tbx1_ - codeblock.tbx0_; |
| var blockHeight = codeblock.tby1_ - codeblock.tby0_; |
| |
| if (blockWidth === 0 || blockHeight === 0) { |
| continue; |
| } |
| |
| if (codeblock.data === undefined) { |
| continue; |
| } |
| |
| var bitModel, currentCodingpassType; |
| bitModel = new BitModel(blockWidth, blockHeight, codeblock.subbandType, codeblock.zeroBitPlanes, mb); |
| currentCodingpassType = 2; |
| var data = codeblock.data, |
| totalLength = 0, |
| codingpasses = 0; |
| var j, jj, dataItem; |
| |
| for (j = 0, jj = data.length; j < jj; j++) { |
| dataItem = data[j]; |
| totalLength += dataItem.end - dataItem.start; |
| codingpasses += dataItem.codingpasses; |
| } |
| |
| var encodedData = new Uint8Array(totalLength); |
| var position = 0; |
| |
| for (j = 0, jj = data.length; j < jj; j++) { |
| dataItem = data[j]; |
| var chunk = dataItem.data.subarray(dataItem.start, dataItem.end); |
| encodedData.set(chunk, position); |
| position += chunk.length; |
| } |
| |
| var decoder = new _arithmetic_decoder.ArithmeticDecoder(encodedData, 0, totalLength); |
| bitModel.setDecoder(decoder); |
| |
| for (j = 0; j < codingpasses; j++) { |
| switch (currentCodingpassType) { |
| case 0: |
| bitModel.runSignificancePropagationPass(); |
| break; |
| |
| case 1: |
| bitModel.runMagnitudeRefinementPass(); |
| break; |
| |
| case 2: |
| bitModel.runCleanupPass(); |
| |
| if (segmentationSymbolUsed) { |
| bitModel.checkSegmentationSymbol(); |
| } |
| |
| break; |
| } |
| |
| currentCodingpassType = (currentCodingpassType + 1) % 3; |
| } |
| |
| var offset = codeblock.tbx0_ - x0 + (codeblock.tby0_ - y0) * width; |
| var sign = bitModel.coefficentsSign; |
| var magnitude = bitModel.coefficentsMagnitude; |
| var bitsDecoded = bitModel.bitsDecoded; |
| var magnitudeCorrection = reversible ? 0 : 0.5; |
| var k, n, nb; |
| position = 0; |
| var interleave = subband.type !== "LL"; |
| |
| for (j = 0; j < blockHeight; j++) { |
| var row = offset / width | 0; |
| var levelOffset = 2 * row * (levelWidth - width) + right + bottom; |
| |
| for (k = 0; k < blockWidth; k++) { |
| n = magnitude[position]; |
| |
| if (n !== 0) { |
| n = (n + magnitudeCorrection) * delta; |
| |
| if (sign[position] !== 0) { |
| n = -n; |
| } |
| |
| nb = bitsDecoded[position]; |
| var pos = interleave ? levelOffset + (offset << 1) : offset; |
| |
| if (reversible && nb >= mb) { |
| coefficients[pos] = n; |
| } else { |
| coefficients[pos] = n * (1 << mb - nb); |
| } |
| } |
| |
| offset++; |
| position++; |
| } |
| |
| offset += width - blockWidth; |
| } |
| } |
| } |
| |
| function transformTile(context, tile, c) { |
| var component = tile.components[c]; |
| var codingStyleParameters = component.codingStyleParameters; |
| var quantizationParameters = component.quantizationParameters; |
| var decompositionLevelsCount = codingStyleParameters.decompositionLevelsCount; |
| var spqcds = quantizationParameters.SPqcds; |
| var scalarExpounded = quantizationParameters.scalarExpounded; |
| var guardBits = quantizationParameters.guardBits; |
| var segmentationSymbolUsed = codingStyleParameters.segmentationSymbolUsed; |
| var precision = context.components[c].precision; |
| var reversible = codingStyleParameters.reversibleTransformation; |
| var transform = reversible ? new ReversibleTransform() : new IrreversibleTransform(); |
| var subbandCoefficients = []; |
| var b = 0; |
| |
| for (var i = 0; i <= decompositionLevelsCount; i++) { |
| var resolution = component.resolutions[i]; |
| var width = resolution.trx1 - resolution.trx0; |
| var height = resolution.try1 - resolution.try0; |
| var coefficients = new Float32Array(width * height); |
| |
| for (var j = 0, jj = resolution.subbands.length; j < jj; j++) { |
| var mu, epsilon; |
| |
| if (!scalarExpounded) { |
| mu = spqcds[0].mu; |
| epsilon = spqcds[0].epsilon + (i > 0 ? 1 - i : 0); |
| } else { |
| mu = spqcds[b].mu; |
| epsilon = spqcds[b].epsilon; |
| b++; |
| } |
| |
| var subband = resolution.subbands[j]; |
| var gainLog2 = SubbandsGainLog2[subband.type]; |
| var delta = reversible ? 1 : 2 ** (precision + gainLog2 - epsilon) * (1 + mu / 2048); |
| var mb = guardBits + epsilon - 1; |
| copyCoefficients(coefficients, width, height, subband, delta, mb, reversible, segmentationSymbolUsed); |
| } |
| |
| subbandCoefficients.push({ |
| width, |
| height, |
| items: coefficients |
| }); |
| } |
| |
| var result = transform.calculate(subbandCoefficients, component.tcx0, component.tcy0); |
| return { |
| left: component.tcx0, |
| top: component.tcy0, |
| width: result.width, |
| height: result.height, |
| items: result.items |
| }; |
| } |
| |
| function transformComponents(context) { |
| var siz = context.SIZ; |
| var components = context.components; |
| var componentsCount = siz.Csiz; |
| var resultImages = []; |
| |
| for (var i = 0, ii = context.tiles.length; i < ii; i++) { |
| var tile = context.tiles[i]; |
| var transformedTiles = []; |
| var c; |
| |
| for (c = 0; c < componentsCount; c++) { |
| transformedTiles[c] = transformTile(context, tile, c); |
| } |
| |
| var tile0 = transformedTiles[0]; |
| var out = new Uint8ClampedArray(tile0.items.length * componentsCount); |
| var result = { |
| left: tile0.left, |
| top: tile0.top, |
| width: tile0.width, |
| height: tile0.height, |
| items: out |
| }; |
| var shift, offset; |
| var pos = 0, |
| j, |
| jj, |
| y0, |
| y1, |
| y2; |
| |
| if (tile.codingStyleDefaultParameters.multipleComponentTransform) { |
| var fourComponents = componentsCount === 4; |
| var y0items = transformedTiles[0].items; |
| var y1items = transformedTiles[1].items; |
| var y2items = transformedTiles[2].items; |
| var y3items = fourComponents ? transformedTiles[3].items : null; |
| shift = components[0].precision - 8; |
| offset = (128 << shift) + 0.5; |
| var component0 = tile.components[0]; |
| var alpha01 = componentsCount - 3; |
| jj = y0items.length; |
| |
| if (!component0.codingStyleParameters.reversibleTransformation) { |
| for (j = 0; j < jj; j++, pos += alpha01) { |
| y0 = y0items[j] + offset; |
| y1 = y1items[j]; |
| y2 = y2items[j]; |
| out[pos++] = y0 + 1.402 * y2 >> shift; |
| out[pos++] = y0 - 0.34413 * y1 - 0.71414 * y2 >> shift; |
| out[pos++] = y0 + 1.772 * y1 >> shift; |
| } |
| } else { |
| for (j = 0; j < jj; j++, pos += alpha01) { |
| y0 = y0items[j] + offset; |
| y1 = y1items[j]; |
| y2 = y2items[j]; |
| const g = y0 - (y2 + y1 >> 2); |
| out[pos++] = g + y2 >> shift; |
| out[pos++] = g >> shift; |
| out[pos++] = g + y1 >> shift; |
| } |
| } |
| |
| if (fourComponents) { |
| for (j = 0, pos = 3; j < jj; j++, pos += 4) { |
| out[pos] = y3items[j] + offset >> shift; |
| } |
| } |
| } else { |
| for (c = 0; c < componentsCount; c++) { |
| var items = transformedTiles[c].items; |
| shift = components[c].precision - 8; |
| offset = (128 << shift) + 0.5; |
| |
| for (pos = c, j = 0, jj = items.length; j < jj; j++) { |
| out[pos] = items[j] + offset >> shift; |
| pos += componentsCount; |
| } |
| } |
| } |
| |
| resultImages.push(result); |
| } |
| |
| return resultImages; |
| } |
| |
| function initializeTile(context, tileIndex) { |
| var siz = context.SIZ; |
| var componentsCount = siz.Csiz; |
| var tile = context.tiles[tileIndex]; |
| |
| for (var c = 0; c < componentsCount; c++) { |
| var component = tile.components[c]; |
| var qcdOrQcc = context.currentTile.QCC[c] !== undefined ? context.currentTile.QCC[c] : context.currentTile.QCD; |
| component.quantizationParameters = qcdOrQcc; |
| var codOrCoc = context.currentTile.COC[c] !== undefined ? context.currentTile.COC[c] : context.currentTile.COD; |
| component.codingStyleParameters = codOrCoc; |
| } |
| |
| tile.codingStyleDefaultParameters = context.currentTile.COD; |
| } |
| |
| var TagTree = function TagTreeClosure() { |
| function TagTree(width, height) { |
| var levelsLength = (0, _core_utils.log2)(Math.max(width, height)) + 1; |
| this.levels = []; |
| |
| for (var i = 0; i < levelsLength; i++) { |
| var level = { |
| width, |
| height, |
| items: [] |
| }; |
| this.levels.push(level); |
| width = Math.ceil(width / 2); |
| height = Math.ceil(height / 2); |
| } |
| } |
| |
| TagTree.prototype = { |
| reset: function TagTree_reset(i, j) { |
| var currentLevel = 0, |
| value = 0, |
| level; |
| |
| while (currentLevel < this.levels.length) { |
| level = this.levels[currentLevel]; |
| var index = i + j * level.width; |
| |
| if (level.items[index] !== undefined) { |
| value = level.items[index]; |
| break; |
| } |
| |
| level.index = index; |
| i >>= 1; |
| j >>= 1; |
| currentLevel++; |
| } |
| |
| currentLevel--; |
| level = this.levels[currentLevel]; |
| level.items[level.index] = value; |
| this.currentLevel = currentLevel; |
| delete this.value; |
| }, |
| incrementValue: function TagTree_incrementValue() { |
| var level = this.levels[this.currentLevel]; |
| level.items[level.index]++; |
| }, |
| nextLevel: function TagTree_nextLevel() { |
| var currentLevel = this.currentLevel; |
| var level = this.levels[currentLevel]; |
| var value = level.items[level.index]; |
| currentLevel--; |
| |
| if (currentLevel < 0) { |
| this.value = value; |
| return false; |
| } |
| |
| this.currentLevel = currentLevel; |
| level = this.levels[currentLevel]; |
| level.items[level.index] = value; |
| return true; |
| } |
| }; |
| return TagTree; |
| }(); |
| |
| var InclusionTree = function InclusionTreeClosure() { |
| function InclusionTree(width, height, defaultValue) { |
| var levelsLength = (0, _core_utils.log2)(Math.max(width, height)) + 1; |
| this.levels = []; |
| |
| for (var i = 0; i < levelsLength; i++) { |
| var items = new Uint8Array(width * height); |
| |
| for (var j = 0, jj = items.length; j < jj; j++) { |
| items[j] = defaultValue; |
| } |
| |
| var level = { |
| width, |
| height, |
| items |
| }; |
| this.levels.push(level); |
| width = Math.ceil(width / 2); |
| height = Math.ceil(height / 2); |
| } |
| } |
| |
| InclusionTree.prototype = { |
| reset: function InclusionTree_reset(i, j, stopValue) { |
| var currentLevel = 0; |
| |
| while (currentLevel < this.levels.length) { |
| var level = this.levels[currentLevel]; |
| var index = i + j * level.width; |
| level.index = index; |
| var value = level.items[index]; |
| |
| if (value === 0xff) { |
| break; |
| } |
| |
| if (value > stopValue) { |
| this.currentLevel = currentLevel; |
| this.propagateValues(); |
| return false; |
| } |
| |
| i >>= 1; |
| j >>= 1; |
| currentLevel++; |
| } |
| |
| this.currentLevel = currentLevel - 1; |
| return true; |
| }, |
| incrementValue: function InclusionTree_incrementValue(stopValue) { |
| var level = this.levels[this.currentLevel]; |
| level.items[level.index] = stopValue + 1; |
| this.propagateValues(); |
| }, |
| propagateValues: function InclusionTree_propagateValues() { |
| var levelIndex = this.currentLevel; |
| var level = this.levels[levelIndex]; |
| var currentValue = level.items[level.index]; |
| |
| while (--levelIndex >= 0) { |
| level = this.levels[levelIndex]; |
| level.items[level.index] = currentValue; |
| } |
| }, |
| nextLevel: function InclusionTree_nextLevel() { |
| var currentLevel = this.currentLevel; |
| var level = this.levels[currentLevel]; |
| var value = level.items[level.index]; |
| level.items[level.index] = 0xff; |
| currentLevel--; |
| |
| if (currentLevel < 0) { |
| return false; |
| } |
| |
| this.currentLevel = currentLevel; |
| level = this.levels[currentLevel]; |
| level.items[level.index] = value; |
| return true; |
| } |
| }; |
| return InclusionTree; |
| }(); |
| |
| var BitModel = function BitModelClosure() { |
| var UNIFORM_CONTEXT = 17; |
| var RUNLENGTH_CONTEXT = 18; |
| 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]); |
| 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]); |
| 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]); |
| |
| function BitModel(width, height, subband, zeroBitPlanes, mb) { |
| this.width = width; |
| this.height = height; |
| let contextLabelTable; |
| |
| if (subband === "HH") { |
| contextLabelTable = HHContextLabel; |
| } else if (subband === "HL") { |
| contextLabelTable = HLContextLabel; |
| } else { |
| contextLabelTable = LLAndLHContextsLabel; |
| } |
| |
| this.contextLabelTable = contextLabelTable; |
| var coefficientCount = width * height; |
| this.neighborsSignificance = new Uint8Array(coefficientCount); |
| this.coefficentsSign = new Uint8Array(coefficientCount); |
| let coefficentsMagnitude; |
| |
| if (mb > 14) { |
| coefficentsMagnitude = new Uint32Array(coefficientCount); |
| } else if (mb > 6) { |
| coefficentsMagnitude = new Uint16Array(coefficientCount); |
| } else { |
| coefficentsMagnitude = new Uint8Array(coefficientCount); |
| } |
| |
| this.coefficentsMagnitude = coefficentsMagnitude; |
| this.processingFlags = new Uint8Array(coefficientCount); |
| var bitsDecoded = new Uint8Array(coefficientCount); |
| |
| if (zeroBitPlanes !== 0) { |
| for (var i = 0; i < coefficientCount; i++) { |
| bitsDecoded[i] = zeroBitPlanes; |
| } |
| } |
| |
| this.bitsDecoded = bitsDecoded; |
| this.reset(); |
| } |
| |
| BitModel.prototype = { |
| setDecoder: function BitModel_setDecoder(decoder) { |
| this.decoder = decoder; |
| }, |
| reset: function BitModel_reset() { |
| this.contexts = new Int8Array(19); |
| this.contexts[0] = 4 << 1 | 0; |
| this.contexts[UNIFORM_CONTEXT] = 46 << 1 | 0; |
| this.contexts[RUNLENGTH_CONTEXT] = 3 << 1 | 0; |
| }, |
| setNeighborsSignificance: function BitModel_setNeighborsSignificance(row, column, index) { |
| var neighborsSignificance = this.neighborsSignificance; |
| var width = this.width, |
| height = this.height; |
| var left = column > 0; |
| var right = column + 1 < width; |
| var i; |
| |
| if (row > 0) { |
| i = index - width; |
| |
| if (left) { |
| neighborsSignificance[i - 1] += 0x10; |
| } |
| |
| if (right) { |
| neighborsSignificance[i + 1] += 0x10; |
| } |
| |
| neighborsSignificance[i] += 0x04; |
| } |
| |
| if (row + 1 < height) { |
| i = index + width; |
| |
| if (left) { |
| neighborsSignificance[i - 1] += 0x10; |
| } |
| |
| if (right) { |
| neighborsSignificance[i + 1] += 0x10; |
| } |
| |
| neighborsSignificance[i] += 0x04; |
| } |
| |
| if (left) { |
| neighborsSignificance[index - 1] += 0x01; |
| } |
| |
| if (right) { |
| neighborsSignificance[index + 1] += 0x01; |
| } |
| |
| neighborsSignificance[index] |= 0x80; |
| }, |
| runSignificancePropagationPass: function BitModel_runSignificancePropagationPass() { |
| var decoder = this.decoder; |
| var width = this.width, |
| height = this.height; |
| var coefficentsMagnitude = this.coefficentsMagnitude; |
| var coefficentsSign = this.coefficentsSign; |
| var neighborsSignificance = this.neighborsSignificance; |
| var processingFlags = this.processingFlags; |
| var contexts = this.contexts; |
| var labels = this.contextLabelTable; |
| var bitsDecoded = this.bitsDecoded; |
| var processedInverseMask = ~1; |
| var processedMask = 1; |
| var firstMagnitudeBitMask = 2; |
| |
| for (var i0 = 0; i0 < height; i0 += 4) { |
| for (var j = 0; j < width; j++) { |
| var index = i0 * width + j; |
| |
| for (var i1 = 0; i1 < 4; i1++, index += width) { |
| var i = i0 + i1; |
| |
| if (i >= height) { |
| break; |
| } |
| |
| processingFlags[index] &= processedInverseMask; |
| |
| if (coefficentsMagnitude[index] || !neighborsSignificance[index]) { |
| continue; |
| } |
| |
| var contextLabel = labels[neighborsSignificance[index]]; |
| var decision = decoder.readBit(contexts, contextLabel); |
| |
| if (decision) { |
| var sign = this.decodeSignBit(i, j, index); |
| coefficentsSign[index] = sign; |
| coefficentsMagnitude[index] = 1; |
| this.setNeighborsSignificance(i, j, index); |
| processingFlags[index] |= firstMagnitudeBitMask; |
| } |
| |
| bitsDecoded[index]++; |
| processingFlags[index] |= processedMask; |
| } |
| } |
| } |
| }, |
| decodeSignBit: function BitModel_decodeSignBit(row, column, index) { |
| var width = this.width, |
| height = this.height; |
| var coefficentsMagnitude = this.coefficentsMagnitude; |
| var coefficentsSign = this.coefficentsSign; |
| var contribution, sign0, sign1, significance1; |
| var contextLabel, decoded; |
| significance1 = column > 0 && coefficentsMagnitude[index - 1] !== 0; |
| |
| if (column + 1 < width && coefficentsMagnitude[index + 1] !== 0) { |
| sign1 = coefficentsSign[index + 1]; |
| |
| if (significance1) { |
| sign0 = coefficentsSign[index - 1]; |
| contribution = 1 - sign1 - sign0; |
| } else { |
| contribution = 1 - sign1 - sign1; |
| } |
| } else if (significance1) { |
| sign0 = coefficentsSign[index - 1]; |
| contribution = 1 - sign0 - sign0; |
| } else { |
| contribution = 0; |
| } |
| |
| var horizontalContribution = 3 * contribution; |
| significance1 = row > 0 && coefficentsMagnitude[index - width] !== 0; |
| |
| if (row + 1 < height && coefficentsMagnitude[index + width] !== 0) { |
| sign1 = coefficentsSign[index + width]; |
| |
| if (significance1) { |
| sign0 = coefficentsSign[index - width]; |
| contribution = 1 - sign1 - sign0 + horizontalContribution; |
| } else { |
| contribution = 1 - sign1 - sign1 + horizontalContribution; |
| } |
| } else if (significance1) { |
| sign0 = coefficentsSign[index - width]; |
| contribution = 1 - sign0 - sign0 + horizontalContribution; |
| } else { |
| contribution = horizontalContribution; |
| } |
| |
| if (contribution >= 0) { |
| contextLabel = 9 + contribution; |
| decoded = this.decoder.readBit(this.contexts, contextLabel); |
| } else { |
| contextLabel = 9 - contribution; |
| decoded = this.decoder.readBit(this.contexts, contextLabel) ^ 1; |
| } |
| |
| return decoded; |
| }, |
| runMagnitudeRefinementPass: function BitModel_runMagnitudeRefinementPass() { |
| var decoder = this.decoder; |
| var width = this.width, |
| height = this.height; |
| var coefficentsMagnitude = this.coefficentsMagnitude; |
| var neighborsSignificance = this.neighborsSignificance; |
| var contexts = this.contexts; |
| var bitsDecoded = this.bitsDecoded; |
| var processingFlags = this.processingFlags; |
| var processedMask = 1; |
| var firstMagnitudeBitMask = 2; |
| var length = width * height; |
| var width4 = width * 4; |
| |
| for (var index0 = 0, indexNext; index0 < length; index0 = indexNext) { |
| indexNext = Math.min(length, index0 + width4); |
| |
| for (var j = 0; j < width; j++) { |
| for (var index = index0 + j; index < indexNext; index += width) { |
| if (!coefficentsMagnitude[index] || (processingFlags[index] & processedMask) !== 0) { |
| continue; |
| } |
| |
| var contextLabel = 16; |
| |
| if ((processingFlags[index] & firstMagnitudeBitMask) !== 0) { |
| processingFlags[index] ^= firstMagnitudeBitMask; |
| var significance = neighborsSignificance[index] & 127; |
| contextLabel = significance === 0 ? 15 : 14; |
| } |
| |
| var bit = decoder.readBit(contexts, contextLabel); |
| coefficentsMagnitude[index] = coefficentsMagnitude[index] << 1 | bit; |
| bitsDecoded[index]++; |
| processingFlags[index] |= processedMask; |
| } |
| } |
| } |
| }, |
| runCleanupPass: function BitModel_runCleanupPass() { |
| var decoder = this.decoder; |
| var width = this.width, |
| height = this.height; |
| var neighborsSignificance = this.neighborsSignificance; |
| var coefficentsMagnitude = this.coefficentsMagnitude; |
| var coefficentsSign = this.coefficentsSign; |
| var contexts = this.contexts; |
| var labels = this.contextLabelTable; |
| var bitsDecoded = this.bitsDecoded; |
| var processingFlags = this.processingFlags; |
| var processedMask = 1; |
| var firstMagnitudeBitMask = 2; |
| var oneRowDown = width; |
| var twoRowsDown = width * 2; |
| var threeRowsDown = width * 3; |
| var iNext; |
| |
| for (var i0 = 0; i0 < height; i0 = iNext) { |
| iNext = Math.min(i0 + 4, height); |
| var indexBase = i0 * width; |
| var checkAllEmpty = i0 + 3 < height; |
| |
| for (var j = 0; j < width; j++) { |
| var index0 = indexBase + j; |
| 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; |
| var i1 = 0, |
| index = index0; |
| var i = i0, |
| sign; |
| |
| if (allEmpty) { |
| var hasSignificantCoefficent = decoder.readBit(contexts, RUNLENGTH_CONTEXT); |
| |
| if (!hasSignificantCoefficent) { |
| bitsDecoded[index0]++; |
| bitsDecoded[index0 + oneRowDown]++; |
| bitsDecoded[index0 + twoRowsDown]++; |
| bitsDecoded[index0 + threeRowsDown]++; |
| continue; |
| } |
| |
| i1 = decoder.readBit(contexts, UNIFORM_CONTEXT) << 1 | decoder.readBit(contexts, UNIFORM_CONTEXT); |
| |
| if (i1 !== 0) { |
| i = i0 + i1; |
| index += i1 * width; |
| } |
| |
| sign = this.decodeSignBit(i, j, index); |
| coefficentsSign[index] = sign; |
| coefficentsMagnitude[index] = 1; |
| this.setNeighborsSignificance(i, j, index); |
| processingFlags[index] |= firstMagnitudeBitMask; |
| index = index0; |
| |
| for (var i2 = i0; i2 <= i; i2++, index += width) { |
| bitsDecoded[index]++; |
| } |
| |
| i1++; |
| } |
| |
| for (i = i0 + i1; i < iNext; i++, index += width) { |
| if (coefficentsMagnitude[index] || (processingFlags[index] & processedMask) !== 0) { |
| continue; |
| } |
| |
| var contextLabel = labels[neighborsSignificance[index]]; |
| var decision = decoder.readBit(contexts, contextLabel); |
| |
| if (decision === 1) { |
| sign = this.decodeSignBit(i, j, index); |
| coefficentsSign[index] = sign; |
| coefficentsMagnitude[index] = 1; |
| this.setNeighborsSignificance(i, j, index); |
| processingFlags[index] |= firstMagnitudeBitMask; |
| } |
| |
| bitsDecoded[index]++; |
| } |
| } |
| } |
| }, |
| checkSegmentationSymbol: function BitModel_checkSegmentationSymbol() { |
| var decoder = this.decoder; |
| var contexts = this.contexts; |
| 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); |
| |
| if (symbol !== 0xa) { |
| throw new JpxError("Invalid segmentation symbol"); |
| } |
| } |
| }; |
| return BitModel; |
| }(); |
| |
| var Transform = function TransformClosure() { |
| function Transform() {} |
| |
| Transform.prototype.calculate = function transformCalculate(subbands, u0, v0) { |
| var ll = subbands[0]; |
| |
| for (var i = 1, ii = subbands.length; i < ii; i++) { |
| ll = this.iterate(ll, subbands[i], u0, v0); |
| } |
| |
| return ll; |
| }; |
| |
| Transform.prototype.extend = function extend(buffer, offset, size) { |
| var i1 = offset - 1, |
| j1 = offset + 1; |
| var i2 = offset + size - 2, |
| j2 = offset + size; |
| buffer[i1--] = buffer[j1++]; |
| buffer[j2++] = buffer[i2--]; |
| buffer[i1--] = buffer[j1++]; |
| buffer[j2++] = buffer[i2--]; |
| buffer[i1--] = buffer[j1++]; |
| buffer[j2++] = buffer[i2--]; |
| buffer[i1] = buffer[j1]; |
| buffer[j2] = buffer[i2]; |
| }; |
| |
| Transform.prototype.iterate = function Transform_iterate(ll, hl_lh_hh, u0, v0) { |
| var llWidth = ll.width, |
| llHeight = ll.height, |
| llItems = ll.items; |
| var width = hl_lh_hh.width; |
| var height = hl_lh_hh.height; |
| var items = hl_lh_hh.items; |
| var i, j, k, l, u, v; |
| |
| for (k = 0, i = 0; i < llHeight; i++) { |
| l = i * 2 * width; |
| |
| for (j = 0; j < llWidth; j++, k++, l += 2) { |
| items[l] = llItems[k]; |
| } |
| } |
| |
| llItems = ll.items = null; |
| var bufferPadding = 4; |
| var rowBuffer = new Float32Array(width + 2 * bufferPadding); |
| |
| if (width === 1) { |
| if ((u0 & 1) !== 0) { |
| for (v = 0, k = 0; v < height; v++, k += width) { |
| items[k] *= 0.5; |
| } |
| } |
| } else { |
| for (v = 0, k = 0; v < height; v++, k += width) { |
| rowBuffer.set(items.subarray(k, k + width), bufferPadding); |
| this.extend(rowBuffer, bufferPadding, width); |
| this.filter(rowBuffer, bufferPadding, width); |
| items.set(rowBuffer.subarray(bufferPadding, bufferPadding + width), k); |
| } |
| } |
| |
| var numBuffers = 16; |
| var colBuffers = []; |
| |
| for (i = 0; i < numBuffers; i++) { |
| colBuffers.push(new Float32Array(height + 2 * bufferPadding)); |
| } |
| |
| var b, |
| currentBuffer = 0; |
| ll = bufferPadding + height; |
| |
| if (height === 1) { |
| if ((v0 & 1) !== 0) { |
| for (u = 0; u < width; u++) { |
| items[u] *= 0.5; |
| } |
| } |
| } else { |
| for (u = 0; u < width; u++) { |
| if (currentBuffer === 0) { |
| numBuffers = Math.min(width - u, numBuffers); |
| |
| for (k = u, l = bufferPadding; l < ll; k += width, l++) { |
| for (b = 0; b < numBuffers; b++) { |
| colBuffers[b][l] = items[k + b]; |
| } |
| } |
| |
| currentBuffer = numBuffers; |
| } |
| |
| currentBuffer--; |
| var buffer = colBuffers[currentBuffer]; |
| this.extend(buffer, bufferPadding, height); |
| this.filter(buffer, bufferPadding, height); |
| |
| if (currentBuffer === 0) { |
| k = u - numBuffers + 1; |
| |
| for (l = bufferPadding; l < ll; k += width, l++) { |
| for (b = 0; b < numBuffers; b++) { |
| items[k + b] = colBuffers[b][l]; |
| } |
| } |
| } |
| } |
| } |
| |
| return { |
| width, |
| height, |
| items |
| }; |
| }; |
| |
| return Transform; |
| }(); |
| |
| var IrreversibleTransform = function IrreversibleTransformClosure() { |
| function IrreversibleTransform() { |
| Transform.call(this); |
| } |
| |
| IrreversibleTransform.prototype = Object.create(Transform.prototype); |
| |
| IrreversibleTransform.prototype.filter = function irreversibleTransformFilter(x, offset, length) { |
| var len = length >> 1; |
| offset = offset | 0; |
| var j, n, current, next; |
| var alpha = -1.586134342059924; |
| var beta = -0.052980118572961; |
| var gamma = 0.882911075530934; |
| var delta = 0.443506852043971; |
| var K = 1.230174104914001; |
| var K_ = 1 / K; |
| j = offset - 3; |
| |
| for (n = len + 4; n--; j += 2) { |
| x[j] *= K_; |
| } |
| |
| j = offset - 2; |
| current = delta * x[j - 1]; |
| |
| for (n = len + 3; n--; j += 2) { |
| next = delta * x[j + 1]; |
| x[j] = K * x[j] - current - next; |
| |
| if (n--) { |
| j += 2; |
| current = delta * x[j + 1]; |
| x[j] = K * x[j] - current - next; |
| } else { |
| break; |
| } |
| } |
| |
| j = offset - 1; |
| current = gamma * x[j - 1]; |
| |
| for (n = len + 2; n--; j += 2) { |
| next = gamma * x[j + 1]; |
| x[j] -= current + next; |
| |
| if (n--) { |
| j += 2; |
| current = gamma * x[j + 1]; |
| x[j] -= current + next; |
| } else { |
| break; |
| } |
| } |
| |
| j = offset; |
| current = beta * x[j - 1]; |
| |
| for (n = len + 1; n--; j += 2) { |
| next = beta * x[j + 1]; |
| x[j] -= current + next; |
| |
| if (n--) { |
| j += 2; |
| current = beta * x[j + 1]; |
| x[j] -= current + next; |
| } else { |
| break; |
| } |
| } |
| |
| if (len !== 0) { |
| j = offset + 1; |
| current = alpha * x[j - 1]; |
| |
| for (n = len; n--; j += 2) { |
| next = alpha * x[j + 1]; |
| x[j] -= current + next; |
| |
| if (n--) { |
| j += 2; |
| current = alpha * x[j + 1]; |
| x[j] -= current + next; |
| } else { |
| break; |
| } |
| } |
| } |
| }; |
| |
| return IrreversibleTransform; |
| }(); |
| |
| var ReversibleTransform = function ReversibleTransformClosure() { |
| function ReversibleTransform() { |
| Transform.call(this); |
| } |
| |
| ReversibleTransform.prototype = Object.create(Transform.prototype); |
| |
| ReversibleTransform.prototype.filter = function reversibleTransformFilter(x, offset, length) { |
| var len = length >> 1; |
| offset = offset | 0; |
| var j, n; |
| |
| for (j = offset, n = len + 1; n--; j += 2) { |
| x[j] -= x[j - 1] + x[j + 1] + 2 >> 2; |
| } |
| |
| for (j = offset + 1, n = len; n--; j += 2) { |
| x[j] += x[j - 1] + x[j + 1] >> 1; |
| } |
| }; |
| |
| return ReversibleTransform; |
| }(); |
| |
| return JpxImage; |
| }(); |
| |
| exports.JpxImage = JpxImage; |
