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Making src/core/jpx.js adhere to the style guide

Tim van der Meij 11 years ago
parent
46487e3931
commit
d5fcfe14d2
1 changed files with 98 additions and 79 deletions
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  1. 177
      src/core/jpx.js

177
src/core/jpx.js
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@ -42,16 +42,18 @@ var JpxImage = (function JpxImageClosure() {
// TODO catch parse error // TODO catch parse error
var data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer); var data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer);
this.parse(data); this.parse(data);
if (this.onload) if (this.onload) {
this.onload(); this.onload();
}
}).bind(this); }).bind(this);
xhr.send(null); xhr.send(null);
}, },
parse: function JpxImage_parse(data) { parse: function JpxImage_parse(data) {
function readUint(data, offset, bytes) { function readUint(data, offset, bytes) {
var n = 0; var n = 0;
for (var i = 0; i < bytes; i++) for (var i = 0; i < bytes; i++) {
n = n * 256 + (data[offset + i] & 0xFF); n = n * 256 + (data[offset + i] & 0xFF);
}
return n; return n;
} }
@ -73,10 +75,12 @@ var JpxImage = (function JpxImageClosure() {
position += 8; position += 8;
headerSize += 8; headerSize += 8;
} }
if (lbox === 0) if (lbox === 0) {
lbox = length - position + headerSize; lbox = length - position + headerSize;
if (lbox < headerSize) }
if (lbox < headerSize) {
error('JPX error: Invalid box field size'); error('JPX error: Invalid box field size');
}
var dataLength = lbox - headerSize; var dataLength = lbox - headerSize;
var jumpDataLength = true; var jumpDataLength = true;
switch (tbox) { switch (tbox) {
@ -93,8 +97,9 @@ var JpxImage = (function JpxImageClosure() {
this.parseCodestream(data, position, position + dataLength); this.parseCodestream(data, position, position + dataLength);
break; break;
} }
if (jumpDataLength) if (jumpDataLength) {
position += dataLength; position += dataLength;
}
} }
}, },
parseCodestream: function JpxImage_parseCodestream(data, start, end) { parseCodestream: function JpxImage_parseCodestream(data, start, end) {
@ -165,7 +170,7 @@ var JpxImage = (function JpxImageClosure() {
default: default:
throw 'Invalid SQcd value ' + sqcd; throw 'Invalid SQcd value ' + sqcd;
} }
qcd.noQuantization = spqcdSize == 8; qcd.noQuantization = (spqcdSize == 8);
qcd.scalarExpounded = scalarExpounded; qcd.scalarExpounded = scalarExpounded;
qcd.guardBits = sqcd >> 5; qcd.guardBits = sqcd >> 5;
var spqcds = []; var spqcds = [];
@ -182,9 +187,9 @@ var JpxImage = (function JpxImageClosure() {
spqcds.push(spqcd); spqcds.push(spqcd);
} }
qcd.SPqcds = spqcds; qcd.SPqcds = spqcds;
if (context.mainHeader) if (context.mainHeader) {
context.QCD = qcd; context.QCD = qcd;
else { } else {
context.currentTile.QCD = qcd; context.currentTile.QCD = qcd;
context.currentTile.QCC = []; context.currentTile.QCC = [];
} }
@ -194,9 +199,9 @@ var JpxImage = (function JpxImageClosure() {
var qcc = {}; var qcc = {};
j = position + 2; j = position + 2;
var cqcc; var cqcc;
if (context.SIZ.Csiz < 257) if (context.SIZ.Csiz < 257) {
cqcc = data[j++]; cqcc = data[j++];
else { } else {
cqcc = readUint16(data, j); cqcc = readUint16(data, j);
j += 2; j += 2;
} }
@ -218,11 +223,11 @@ var JpxImage = (function JpxImageClosure() {
default: default:
throw 'Invalid SQcd value ' + sqcd; throw 'Invalid SQcd value ' + sqcd;
} }
qcc.noQuantization = spqcdSize == 8; qcc.noQuantization = (spqcdSize == 8);
qcc.scalarExpounded = scalarExpounded; qcc.scalarExpounded = scalarExpounded;
qcc.guardBits = sqcd >> 5; qcc.guardBits = sqcd >> 5;
var spqcds = []; var spqcds = [];
while (j < length + position) { while (j < (length + position)) {
var spqcd = {}; var spqcd = {};
if (spqcdSize == 8) { if (spqcdSize == 8) {
spqcd.epsilon = data[j++] >> 3; spqcd.epsilon = data[j++] >> 3;
@ -235,10 +240,11 @@ var JpxImage = (function JpxImageClosure() {
spqcds.push(spqcd); spqcds.push(spqcd);
} }
qcc.SPqcds = spqcds; qcc.SPqcds = spqcds;
if (context.mainHeader) if (context.mainHeader) {
context.QCC[cqcc] = qcc; context.QCC[cqcc] = qcc;
else } else {
context.currentTile.QCC[cqcc] = qcc; context.currentTile.QCC[cqcc] = qcc;
}
break; break;
case 0xFF52: // Coding style default (COD) case 0xFF52: // Coding style default (COD)
length = readUint16(data, position); length = readUint16(data, position);
@ -281,13 +287,14 @@ var JpxImage = (function JpxImageClosure() {
cod.selectiveArithmeticCodingBypass || cod.selectiveArithmeticCodingBypass ||
cod.resetContextProbabilities || cod.resetContextProbabilities ||
cod.terminationOnEachCodingPass || cod.terminationOnEachCodingPass ||
cod.verticalyStripe || cod.predictableTermination) cod.verticalyStripe || cod.predictableTermination) {
throw 'Unsupported COD options: ' + throw 'Unsupported COD options: ' +
globalScope.JSON.stringify(cod); globalScope.JSON.stringify(cod);
}
if (context.mainHeader) if (context.mainHeader) {
context.COD = cod; context.COD = cod;
else { } else {
context.currentTile.COD = cod; context.currentTile.COD = cod;
context.currentTile.COC = []; context.currentTile.COC = [];
} }
@ -320,7 +327,6 @@ var JpxImage = (function JpxImageClosure() {
// moving to the end of the data // moving to the end of the data
length = tile.dataEnd - position; length = tile.dataEnd - position;
parseTilePackets(context, data, position, length); parseTilePackets(context, data, position, length);
break; break;
case 0xFF64: // Comment (COM) case 0xFF64: // Comment (COM)
@ -333,10 +339,11 @@ var JpxImage = (function JpxImageClosure() {
position += length; position += length;
} }
} catch (e) { } catch (e) {
if (this.failOnCorruptedImage) if (this.failOnCorruptedImage) {
error('JPX error: ' + e); error('JPX error: ' + e);
else } else {
warn('JPX error: ' + e + '. Trying to recover'); warn('JPX error: ' + e + '. Trying to recover');
}
} }
this.tiles = transformComponents(context); this.tiles = transformComponents(context);
this.width = context.SIZ.Xsiz - context.SIZ.XOsiz; this.width = context.SIZ.Xsiz - context.SIZ.XOsiz;
@ -346,7 +353,7 @@ var JpxImage = (function JpxImageClosure() {
}; };
function readUint32(data, offset) { function readUint32(data, offset) {
return (data[offset] << 24) | (data[offset + 1] << 16) | return (data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3]; (data[offset + 2] << 8) | data[offset + 3];
} }
function readUint16(data, offset) { function readUint16(data, offset) {
return (data[offset] << 8) | data[offset + 1]; return (data[offset] << 8) | data[offset + 1];
@ -416,27 +423,27 @@ var JpxImage = (function JpxImageClosure() {
result.PPy = codOrCoc.precinctsSizes[r].PPy; result.PPy = codOrCoc.precinctsSizes[r].PPy;
} }
// calculate codeblock size as described in section B.7 // calculate codeblock size as described in section B.7
result.xcb_ = r > 0 ? Math.min(codOrCoc.xcb, result.PPx - 1) : result.xcb_ = (r > 0 ? Math.min(codOrCoc.xcb, result.PPx - 1) :
Math.min(codOrCoc.xcb, result.PPx); Math.min(codOrCoc.xcb, result.PPx));
result.ycb_ = r > 0 ? Math.min(codOrCoc.ycb, result.PPy - 1) : result.ycb_ = (r > 0 ? Math.min(codOrCoc.ycb, result.PPy - 1) :
Math.min(codOrCoc.ycb, result.PPy); Math.min(codOrCoc.ycb, result.PPy));
return result; return result;
} }
function buildPrecincts(context, resolution, dimensions) { function buildPrecincts(context, resolution, dimensions) {
// Section B.6 Division resolution to precincts // Section B.6 Division resolution to precincts
var precinctWidth = 1 << dimensions.PPx; var precinctWidth = 1 << dimensions.PPx;
var precinctHeight = 1 << dimensions.PPy; var precinctHeight = 1 << dimensions.PPy;
var numprecinctswide = resolution.trx1 > resolution.trx0 ? var numprecinctswide = (resolution.trx1 > resolution.trx0 ?
Math.ceil(resolution.trx1 / precinctWidth) - Math.ceil(resolution.trx1 / precinctWidth) -
Math.floor(resolution.trx0 / precinctWidth) : 0; Math.floor(resolution.trx0 / precinctWidth) : 0);
var numprecinctshigh = resolution.try1 > resolution.try0 ? var numprecinctshigh = (resolution.try1 > resolution.try0 ?
Math.ceil(resolution.try1 / precinctHeight) - Math.ceil(resolution.try1 / precinctHeight) -
Math.floor(resolution.try0 / precinctHeight) : 0; Math.floor(resolution.try0 / precinctHeight) : 0);
var numprecincts = numprecinctswide * numprecinctshigh; var numprecincts = numprecinctswide * numprecinctshigh;
var precinctXOffset = Math.floor(resolution.trx0 / precinctWidth) * var precinctXOffset = Math.floor(resolution.trx0 / precinctWidth) *
precinctWidth; precinctWidth;
var precinctYOffset = Math.floor(resolution.try0 / precinctHeight) * var precinctYOffset = Math.floor(resolution.try0 / precinctHeight) *
precinctHeight; precinctHeight;
resolution.precinctParameters = { resolution.precinctParameters = {
precinctXOffset: precinctXOffset, precinctXOffset: precinctXOffset,
precinctYOffset: precinctYOffset, precinctYOffset: precinctYOffset,
@ -472,13 +479,13 @@ var JpxImage = (function JpxImageClosure() {
}; };
// calculate precinct number // calculate precinct number
var pi = Math.floor((codeblock.tbx0 - var pi = Math.floor((codeblock.tbx0 -
precinctParameters.precinctXOffset) / precinctParameters.precinctXOffset) /
precinctParameters.precinctWidth); precinctParameters.precinctWidth);
var pj = Math.floor((codeblock.tby0 - var pj = Math.floor((codeblock.tby0 -
precinctParameters.precinctYOffset) / precinctParameters.precinctYOffset) /
precinctParameters.precinctHeight); precinctParameters.precinctHeight);
var precinctNumber = pj + var precinctNumber = pj +
pi * precinctParameters.numprecinctswide; pi * precinctParameters.numprecinctswide;
codeblock.tbx0_ = Math.max(subband.tbx0, codeblock.tbx0); codeblock.tbx0_ = Math.max(subband.tbx0, codeblock.tbx0);
codeblock.tby0_ = Math.max(subband.tby0, codeblock.tby0); codeblock.tby0_ = Math.max(subband.tby0, codeblock.tby0);
codeblock.tbx1_ = Math.min(subband.tbx1, codeblock.tbx1); codeblock.tbx1_ = Math.min(subband.tbx1, codeblock.tbx1);
@ -486,7 +493,7 @@ var JpxImage = (function JpxImageClosure() {
codeblock.precinctNumber = precinctNumber; codeblock.precinctNumber = precinctNumber;
codeblock.subbandType = subband.type; codeblock.subbandType = subband.type;
var coefficientsLength = (codeblock.tbx1_ - codeblock.tbx0_) * var coefficientsLength = (codeblock.tbx1_ - codeblock.tbx0_) *
(codeblock.tby1_ - codeblock.tby0_); (codeblock.tby1_ - codeblock.tby0_);
codeblock.Lblock = 3; codeblock.Lblock = 3;
codeblocks.push(codeblock); codeblocks.push(codeblock);
// building precinct for the sub-band // building precinct for the sub-band
@ -562,8 +569,9 @@ var JpxImage = (function JpxImageClosure() {
for (; r <= maxDecompositionLevelsCount; r++) { for (; r <= maxDecompositionLevelsCount; r++) {
for (; i < componentsCount; i++) { for (; i < componentsCount; i++) {
var component = tile.components[i]; var component = tile.components[i];
if (r > component.codingStyleParameters.decompositionLevelsCount) if (r > component.codingStyleParameters.decompositionLevelsCount) {
continue; continue;
}
var resolution = component.resolutions[r]; var resolution = component.resolutions[r];
var numprecincts = resolution.precinctParameters.numprecincts; var numprecincts = resolution.precinctParameters.numprecincts;
@ -601,8 +609,9 @@ var JpxImage = (function JpxImageClosure() {
for (; l < layersCount; l++) { for (; l < layersCount; l++) {
for (; i < componentsCount; i++) { for (; i < componentsCount; i++) {
var component = tile.components[i]; var component = tile.components[i];
if (r > component.codingStyleParameters.decompositionLevelsCount) if (r > component.codingStyleParameters.decompositionLevelsCount) {
continue; continue;
}
var resolution = component.resolutions[r]; var resolution = component.resolutions[r];
var numprecincts = resolution.precinctParameters.numprecincts; var numprecincts = resolution.precinctParameters.numprecincts;
@ -884,7 +893,7 @@ var JpxImage = (function JpxImageClosure() {
var bitModel, currentCodingpassType; var bitModel, currentCodingpassType;
bitModel = new BitModel(blockWidth, blockHeight, codeblock.subbandType, bitModel = new BitModel(blockWidth, blockHeight, codeblock.subbandType,
codeblock.zeroBitPlanes); codeblock.zeroBitPlanes);
currentCodingpassType = 2; // first bit plane starts from cleanup currentCodingpassType = 2; // first bit plane starts from cleanup
// collect data // collect data
@ -955,8 +964,8 @@ var JpxImage = (function JpxImageClosure() {
var precision = context.components[c].precision; var precision = context.components[c].precision;
var transformation = codingStyleParameters.transformation; var transformation = codingStyleParameters.transformation;
var transform = transformation === TransformType.IRREVERSIBLE ? var transform = (transformation === TransformType.IRREVERSIBLE ?
new IrreversibleTransform() : new ReversibleTransform(); new IrreversibleTransform() : new ReversibleTransform());
var subbandCoefficients = []; var subbandCoefficients = [];
var k = 0, b = 0; var k = 0, b = 0;
@ -980,8 +989,8 @@ var JpxImage = (function JpxImageClosure() {
var gainLog2 = SubbandsGainLog2[subband.type]; var gainLog2 = SubbandsGainLog2[subband.type];
// calulate quantization coefficient (Section E.1.1.1) // calulate quantization coefficient (Section E.1.1.1)
var delta = transformation === TransformType.IRREVERSIBLE ? var delta = (transformation === TransformType.IRREVERSIBLE ?
Math.pow(2, precision + gainLog2 - epsilon) * (1 + mu / 2048) : 1; Math.pow(2, precision + gainLog2 - epsilon) * (1 + mu / 2048) : 1);
var mb = (guardBits + epsilon - 1); var mb = (guardBits + epsilon - 1);
var coefficients = new Float32Array(width * height); var coefficients = new Float32Array(width * height);
@ -1000,7 +1009,7 @@ var JpxImage = (function JpxImageClosure() {
} }
var result = transform.calculate(subbandCoefficients, var result = transform.calculate(subbandCoefficients,
component.tcx0, component.tcy0); component.tcx0, component.tcy0);
return { return {
left: component.tcx0, left: component.tcx0,
top: component.tcy0, top: component.tcy0,
@ -1093,11 +1102,11 @@ var JpxImage = (function JpxImageClosure() {
var resultTiles = []; var resultTiles = [];
for (var c = 0; c < componentsCount; c++) { for (var c = 0; c < componentsCount; c++) {
var component = tile.components[c]; var component = tile.components[c];
var qcdOrQcc = c in context.currentTile.QCC ? var qcdOrQcc = (c in context.currentTile.QCC ?
context.currentTile.QCC[c] : context.currentTile.QCD; context.currentTile.QCC[c] : context.currentTile.QCD);
component.quantizationParameters = qcdOrQcc; component.quantizationParameters = qcdOrQcc;
var codOrCoc = c in context.currentTile.COC ? var codOrCoc = (c in context.currentTile.COC ?
context.currentTile.COC[c] : context.currentTile.COD; context.currentTile.COC[c] : context.currentTile.COD);
component.codingStyleParameters = codOrCoc; component.codingStyleParameters = codOrCoc;
} }
tile.codingStyleDefaultParameters = context.currentTile.COD; tile.codingStyleDefaultParameters = context.currentTile.COD;
@ -1458,8 +1467,8 @@ var JpxImage = (function JpxImageClosure() {
this.width = width; this.width = width;
this.height = height; this.height = height;
this.contextLabelTable = subband == 'HH' ? HHContextLabel : this.contextLabelTable = (subband == 'HH' ? HHContextLabel :
subband == 'HL' ? HLContextLabel : LLAndLHContextsLabel; (subband == 'HL' ? HLContextLabel : LLAndLHContextsLabel));
var coefficientCount = width * height; var coefficientCount = width * height;
@ -1471,8 +1480,9 @@ var JpxImage = (function JpxImageClosure() {
this.processingFlags = new Uint8Array(coefficientCount); this.processingFlags = new Uint8Array(coefficientCount);
var bitsDecoded = new Uint8Array(this.width * this.height); var bitsDecoded = new Uint8Array(this.width * this.height);
for (var i = 0, ii = bitsDecoded.length; i < ii; i++) for (var i = 0, ii = bitsDecoded.length; i < ii; i++) {
bitsDecoded[i] = zeroBitPlanes; bitsDecoded[i] = zeroBitPlanes;
}
this.bitsDecoded = bitsDecoded; this.bitsDecoded = bitsDecoded;
this.reset(); this.reset();
@ -1551,8 +1561,10 @@ var JpxImage = (function JpxImageClosure() {
break; break;
} }
if (coefficentsMagnitude[index] || !neighborsSignificance[index]) if (coefficentsMagnitude[index] ||
!neighborsSignificance[index]) {
continue; continue;
}
var contextLabel = labels[neighborsSignificance[index]]; var contextLabel = labels[neighborsSignificance[index]];
var cx = contexts[contextLabel]; var cx = contexts[contextLabel];
@ -1620,8 +1632,7 @@ var JpxImage = (function JpxImageClosure() {
} }
var contextLabel = 16; var contextLabel = 16;
if ((processingFlags[index] & if ((processingFlags[index] & firstMagnitudeBitMask) !== 0) {
firstMagnitudeBitMask) !== 0) {
processingFlags[i * width + j] ^= firstMagnitudeBitMask; processingFlags[i * width + j] ^= firstMagnitudeBitMask;
// first refinement // first refinement
var significance = neighborsSignificance[index]; var significance = neighborsSignificance[index];
@ -1661,7 +1672,7 @@ var JpxImage = (function JpxImageClosure() {
var index0 = i0 * width + j; var index0 = i0 * width + j;
// using the property: labels[neighborsSignificance[index]] == 0 // using the property: labels[neighborsSignificance[index]] == 0
// when neighborsSignificance[index] == 0 // when neighborsSignificance[index] == 0
var allEmpty = i0 + 3 < height && var allEmpty = (i0 + 3 < height &&
processingFlags[index0] === 0 && processingFlags[index0] === 0 &&
processingFlags[index0 + oneRowDown] === 0 && processingFlags[index0 + oneRowDown] === 0 &&
processingFlags[index0 + twoRowsDown] === 0 && processingFlags[index0 + twoRowsDown] === 0 &&
@ -1669,7 +1680,7 @@ var JpxImage = (function JpxImageClosure() {
neighborsSignificance[index0] === 0 && neighborsSignificance[index0] === 0 &&
neighborsSignificance[index0 + oneRowDown] === 0 && neighborsSignificance[index0 + oneRowDown] === 0 &&
neighborsSignificance[index0 + twoRowsDown] === 0 && neighborsSignificance[index0 + twoRowsDown] === 0 &&
neighborsSignificance[index0 + threeRowsDown] === 0; neighborsSignificance[index0 + threeRowsDown] === 0);
var i1 = 0, index = index0; var i1 = 0, index = index0;
var cx, i; var cx, i;
if (allEmpty) { if (allEmpty) {
@ -1740,10 +1751,10 @@ var JpxImage = (function JpxImageClosure() {
return BitModel; return BitModel;
})(); })();
// Section F, Discrete wavelet transofrmation // Section F, Discrete wavelet transformation
var Transform = (function TransformClosure() { var Transform = (function TransformClosure() {
function Transform() { function Transform() {}
}
Transform.prototype.calculate = Transform.prototype.calculate =
function transformCalculate(subbands, u0, v0) { function transformCalculate(subbands, u0, v0) {
var ll = subbands[0]; var ll = subbands[0];
@ -1754,17 +1765,17 @@ var JpxImage = (function JpxImageClosure() {
return ll; return ll;
}; };
Transform.prototype.extend = function extend(buffer, offset, size) { Transform.prototype.extend = function extend(buffer, offset, size) {
// Section F.3.7 extending... using max extension of 4 // Section F.3.7 extending... using max extension of 4
var i1 = offset - 1, j1 = offset + 1; var i1 = offset - 1, j1 = offset + 1;
var i2 = offset + size - 2, j2 = offset + size; var i2 = offset + size - 2, j2 = offset + size;
buffer[i1--] = buffer[j1++]; buffer[i1--] = buffer[j1++];
buffer[j2++] = buffer[i2--]; buffer[j2++] = buffer[i2--];
buffer[i1--] = buffer[j1++]; buffer[i1--] = buffer[j1++];
buffer[j2++] = buffer[i2--]; buffer[j2++] = buffer[i2--];
buffer[i1--] = buffer[j1++]; buffer[i1--] = buffer[j1++];
buffer[j2++] = buffer[i2--]; buffer[j2++] = buffer[i2--];
buffer[i1] = buffer[j1]; buffer[i1] = buffer[j1];
buffer[j2] = buffer[i2]; buffer[j2] = buffer[i2];
}; };
Transform.prototype.iterate = function Transform_iterate(ll, hl, lh, hh, Transform.prototype.iterate = function Transform_iterate(ll, hl, lh, hh,
u0, v0) { u0, v0) {
@ -1906,33 +1917,39 @@ var JpxImage = (function JpxImageClosure() {
// step 1 // step 1
var j = offset_ - 2; var j = offset_ - 2;
for (var n = i0_ - 1, nn = i1_ + 2; n < nn; n++, j += 2) for (var n = i0_ - 1, nn = i1_ + 2; n < nn; n++, j += 2) {
x[j] = K * y[j]; x[j] = K * y[j];
}
// step 2 // step 2
var j = offset_ - 3; var j = offset_ - 3;
for (var n = i0_ - 2, nn = i1_ + 2; n < nn; n++, j += 2) for (var n = i0_ - 2, nn = i1_ + 2; n < nn; n++, j += 2) {
x[j] = K_ * y[j]; x[j] = K_ * y[j];
}
// step 3 // step 3
var j = offset_ - 2; var j = offset_ - 2;
for (var n = i0_ - 1, nn = i1_ + 2; n < nn; n++, j += 2) for (var n = i0_ - 1, nn = i1_ + 2; n < nn; n++, j += 2) {
x[j] -= delta * (x[j - 1] + x[j + 1]); x[j] -= delta * (x[j - 1] + x[j + 1]);
}
// step 4 // step 4
var j = offset_ - 1; var j = offset_ - 1;
for (var n = i0_ - 1, nn = i1_ + 1; n < nn; n++, j += 2) for (var n = i0_ - 1, nn = i1_ + 1; n < nn; n++, j += 2) {
x[j] -= gamma * (x[j - 1] + x[j + 1]); x[j] -= gamma * (x[j - 1] + x[j + 1]);
}
// step 5 // step 5
var j = offset_; var j = offset_;
for (var n = i0_, nn = i1_ + 1; n < nn; n++, j += 2) for (var n = i0_, nn = i1_ + 1; n < nn; n++, j += 2) {
x[j] -= beta * (x[j - 1] + x[j + 1]); x[j] -= beta * (x[j - 1] + x[j + 1]);
}
// step 6 // step 6
var j = offset_ + 1; var j = offset_ + 1;
for (var n = i0_, nn = i1_; n < nn; n++, j += 2) for (var n = i0_, nn = i1_; n < nn; n++, j += 2) {
x[j] -= alpha * (x[j - 1] + x[j + 1]); x[j] -= alpha * (x[j - 1] + x[j + 1]);
}
}; };
return IrreversibleTransform; return IrreversibleTransform;
@ -1951,11 +1968,13 @@ var JpxImage = (function JpxImageClosure() {
var i1_ = Math.floor((i0 + length) / 2); var i1_ = Math.floor((i0 + length) / 2);
var offset_ = offset - (i0 % 1); var offset_ = offset - (i0 % 1);
for (var n = i0_, nn = i1_ + 1, j = offset_; n < nn; n++, j += 2) for (var n = i0_, nn = i1_ + 1, j = offset_; n < nn; n++, j += 2) {
x[j] = y[j] - Math.floor((y[j - 1] + y[j + 1] + 2) / 4); x[j] = y[j] - Math.floor((y[j - 1] + y[j + 1] + 2) / 4);
}
for (var n = i0_, nn = i1_, j = offset_ + 1; n < nn; n++, j += 2) for (var n = i0_, nn = i1_, j = offset_ + 1; n < nn; n++, j += 2) {
x[j] = y[j] + Math.floor((x[j - 1] + x[j + 1]) / 2); x[j] = y[j] + Math.floor((x[j - 1] + x[j + 1]) / 2);
}
}; };
return ReversibleTransform; return ReversibleTransform;

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