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antosdk-apps/libjpeg/jpg.js
lxsang cc3036c028 add libjpeg
2020-12-28 17:12:36 +00:00

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/**
* @license
* Copyright 2015 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.
*/
function loadURLasArrayBuffer(path, callback) {
if (path.indexOf("data:") === 0) {
var offset = path.indexOf("base64,") + 7;
var data = atob(path.substring(offset));
var arr = new Uint8Array(data.length);
for (var i = data.length - 1; i >= 0; i--) {
arr[i] = data.charCodeAt(i);
}
callback(arr.buffer);
return;
}
var xhr = new XMLHttpRequest();
xhr.open("GET", path, true);
xhr.responseType = "arraybuffer";
xhr.onload = function() {
callback(xhr.response);
};
xhr.send(null);
}
var JpegImage = function jpegImage() {
function JpegImage() {
this._src = null;
this._parser = new PDFJS.JpegImage();
this.onload = null;
}
JpegImage.prototype = {
get src() {
return this._src;
},
set src(value) {
this.load(value);
},
get width() {
return this._parser.width;
},
get height() {
return this._parser.height;
},
load: function load(path) {
this._src = path;
loadURLasArrayBuffer(path, function(buffer) {
this.parse(new Uint8Array(buffer));
if (this.onload) {
this.onload();
}
}.bind(this));
},
parse: function(data) {
this._parser.parse(data);
},
getData: function(width, height) {
return this._parser.getData(width, height, false);
},
copyToImageData: function copyToImageData(imageData) {
if (this._parser.numComponents === 2 || this._parser.numComponents > 4) {
throw new Error("Unsupported amount of components");
}
var width = imageData.width, height = imageData.height;
var imageDataBytes = width * height * 4;
var imageDataArray = imageData.data;
var i, j;
if (this._parser.numComponents === 1) {
var values = this._parser.getData(width, height, false);
for (i = 0, j = 0; i < imageDataBytes; ) {
var value = values[j++];
imageDataArray[i++] = value;
imageDataArray[i++] = value;
imageDataArray[i++] = value;
imageDataArray[i++] = 255;
}
return;
}
var rgb = this._parser.getData(width, height, true);
for (i = 0, j = 0; i < imageDataBytes; ) {
imageDataArray[i++] = rgb[j++];
imageDataArray[i++] = rgb[j++];
imageDataArray[i++] = rgb[j++];
imageDataArray[i++] = 255;
}
}
};
return JpegImage;
}();
if (typeof exports === "function") {
module.exports = {
JpegImage: JpegImage,
JpegDecoder: JpegDecoder,
JpxDecoder: JpxDecoder,
Jbig2Decoder: Jbig2Decoder
};
}
var PDFJS;
(function(PDFJS) {
"use strict";
var JpegImage = function jpegImage() {
var dctZigZag = new Uint8Array([ 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63 ]);
var dctCos1 = 4017;
var dctSin1 = 799;
var dctCos3 = 3406;
var dctSin3 = 2276;
var dctCos6 = 1567;
var dctSin6 = 3784;
var dctSqrt2 = 5793;
var dctSqrt1d2 = 2896;
function constructor() {}
function buildHuffmanTable(codeLengths, values) {
var k = 0, code = [], i, j, length = 16;
while (length > 0 && !codeLengths[length - 1]) {
length--;
}
code.push({
children: [],
index: 0
});
var p = code[0], q;
for (i = 0; i < length; i++) {
for (j = 0; j < codeLengths[i]; j++) {
p = code.pop();
p.children[p.index] = values[k];
while (p.index > 0) {
p = code.pop();
}
p.index++;
code.push(p);
while (code.length <= i) {
code.push(q = {
children: [],
index: 0
});
p.children[p.index] = q.children;
p = q;
}
k++;
}
if (i + 1 < length) {
code.push(q = {
children: [],
index: 0
});
p.children[p.index] = q.children;
p = q;
}
}
return code[0].children;
}
function getBlockBufferOffset(component, row, col) {
return 64 * ((component.blocksPerLine + 1) * row + col);
}
function decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successivePrev, successive) {
var precision = frame.precision;
var samplesPerLine = frame.samplesPerLine;
var scanLines = frame.scanLines;
var mcusPerLine = frame.mcusPerLine;
var progressive = frame.progressive;
var maxH = frame.maxH, maxV = frame.maxV;
var startOffset = offset, bitsData = 0, bitsCount = 0;
function readBit() {
if (bitsCount > 0) {
bitsCount--;
return bitsData >> bitsCount & 1;
}
bitsData = data[offset++];
if (bitsData === 255) {
var nextByte = data[offset++];
if (nextByte) {
throw "unexpected marker: " + (bitsData << 8 | nextByte).toString(16);
}
}
bitsCount = 7;
return bitsData >>> 7;
}
function decodeHuffman(tree) {
var node = tree;
while (true) {
node = node[readBit()];
if (typeof node === "number") {
return node;
}
if (typeof node !== "object") {
throw "invalid huffman sequence";
}
}
}
function receive(length) {
var n = 0;
while (length > 0) {
n = n << 1 | readBit();
length--;
}
return n;
}
function receiveAndExtend(length) {
if (length === 1) {
return readBit() === 1 ? 1 : -1;
}
var n = receive(length);
if (n >= 1 << length - 1) {
return n;
}
return n + (-1 << length) + 1;
}
function decodeBaseline(component, offset) {
var t = decodeHuffman(component.huffmanTableDC);
var diff = t === 0 ? 0 : receiveAndExtend(t);
component.blockData[offset] = component.pred += diff;
var k = 1;
while (k < 64) {
var rs = decodeHuffman(component.huffmanTableAC);
var s = rs & 15, r = rs >> 4;
if (s === 0) {
if (r < 15) {
break;
}
k += 16;
continue;
}
k += r;
var z = dctZigZag[k];
component.blockData[offset + z] = receiveAndExtend(s);
k++;
}
}
function decodeDCFirst(component, offset) {
var t = decodeHuffman(component.huffmanTableDC);
var diff = t === 0 ? 0 : receiveAndExtend(t) << successive;
component.blockData[offset] = component.pred += diff;
}
function decodeDCSuccessive(component, offset) {
component.blockData[offset] |= readBit() << successive;
}
var eobrun = 0;
function decodeACFirst(component, offset) {
if (eobrun > 0) {
eobrun--;
return;
}
var k = spectralStart, e = spectralEnd;
while (k <= e) {
var rs = decodeHuffman(component.huffmanTableAC);
var s = rs & 15, r = rs >> 4;
if (s === 0) {
if (r < 15) {
eobrun = receive(r) + (1 << r) - 1;
break;
}
k += 16;
continue;
}
k += r;
var z = dctZigZag[k];
component.blockData[offset + z] = receiveAndExtend(s) * (1 << successive);
k++;
}
}
var successiveACState = 0, successiveACNextValue;
function decodeACSuccessive(component, offset) {
var k = spectralStart;
var e = spectralEnd;
var r = 0;
var s;
var rs;
while (k <= e) {
var z = dctZigZag[k];
switch (successiveACState) {
case 0:
rs = decodeHuffman(component.huffmanTableAC);
s = rs & 15;
r = rs >> 4;
if (s === 0) {
if (r < 15) {
eobrun = receive(r) + (1 << r);
successiveACState = 4;
} else {
r = 16;
successiveACState = 1;
}
} else {
if (s !== 1) {
throw "invalid ACn encoding";
}
successiveACNextValue = receiveAndExtend(s);
successiveACState = r ? 2 : 3;
}
continue;
case 1:
case 2:
if (component.blockData[offset + z]) {
component.blockData[offset + z] += readBit() << successive;
} else {
r--;
if (r === 0) {
successiveACState = successiveACState === 2 ? 3 : 0;
}
}
break;
case 3:
if (component.blockData[offset + z]) {
component.blockData[offset + z] += readBit() << successive;
} else {
component.blockData[offset + z] = successiveACNextValue << successive;
successiveACState = 0;
}
break;
case 4:
if (component.blockData[offset + z]) {
component.blockData[offset + z] += readBit() << successive;
}
break;
}
k++;
}
if (successiveACState === 4) {
eobrun--;
if (eobrun === 0) {
successiveACState = 0;
}
}
}
function decodeMcu(component, decode, mcu, row, col) {
var mcuRow = mcu / mcusPerLine | 0;
var mcuCol = mcu % mcusPerLine;
var blockRow = mcuRow * component.v + row;
var blockCol = mcuCol * component.h + col;
var offset = getBlockBufferOffset(component, blockRow, blockCol);
decode(component, offset);
}
function decodeBlock(component, decode, mcu) {
var blockRow = mcu / component.blocksPerLine | 0;
var blockCol = mcu % component.blocksPerLine;
var offset = getBlockBufferOffset(component, blockRow, blockCol);
decode(component, offset);
}
var componentsLength = components.length;
var component, i, j, k, n;
var decodeFn;
if (progressive) {
if (spectralStart === 0) {
decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
} else {
decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
}
} else {
decodeFn = decodeBaseline;
}
var mcu = 0, marker;
var mcuExpected;
if (componentsLength === 1) {
mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
} else {
mcuExpected = mcusPerLine * frame.mcusPerColumn;
}
if (!resetInterval) {
resetInterval = mcuExpected;
}
var h, v;
while (mcu < mcuExpected) {
for (i = 0; i < componentsLength; i++) {
components[i].pred = 0;
}
eobrun = 0;
if (componentsLength === 1) {
component = components[0];
for (n = 0; n < resetInterval; n++) {
decodeBlock(component, decodeFn, mcu);
mcu++;
}
} else {
for (n = 0; n < resetInterval; n++) {
for (i = 0; i < componentsLength; i++) {
component = components[i];
h = component.h;
v = component.v;
for (j = 0; j < v; j++) {
for (k = 0; k < h; k++) {
decodeMcu(component, decodeFn, mcu, j, k);
}
}
}
mcu++;
}
}
bitsCount = 0;
marker = data[offset] << 8 | data[offset + 1];
if (marker <= 65280) {
throw "marker was not found";
}
if (marker >= 65488 && marker <= 65495) {
offset += 2;
} else {
break;
}
}
return offset - startOffset;
}
function quantizeAndInverse(component, blockBufferOffset, p) {
var qt = component.quantizationTable, blockData = component.blockData;
var v0, v1, v2, v3, v4, v5, v6, v7;
var p0, p1, p2, p3, p4, p5, p6, p7;
var t;
for (var row = 0; row < 64; row += 8) {
p0 = blockData[blockBufferOffset + row];
p1 = blockData[blockBufferOffset + row + 1];
p2 = blockData[blockBufferOffset + row + 2];
p3 = blockData[blockBufferOffset + row + 3];
p4 = blockData[blockBufferOffset + row + 4];
p5 = blockData[blockBufferOffset + row + 5];
p6 = blockData[blockBufferOffset + row + 6];
p7 = blockData[blockBufferOffset + row + 7];
p0 *= qt[row];
if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {
t = dctSqrt2 * p0 + 512 >> 10;
p[row] = t;
p[row + 1] = t;
p[row + 2] = t;
p[row + 3] = t;
p[row + 4] = t;
p[row + 5] = t;
p[row + 6] = t;
p[row + 7] = t;
continue;
}
p1 *= qt[row + 1];
p2 *= qt[row + 2];
p3 *= qt[row + 3];
p4 *= qt[row + 4];
p5 *= qt[row + 5];
p6 *= qt[row + 6];
p7 *= qt[row + 7];
v0 = dctSqrt2 * p0 + 128 >> 8;
v1 = dctSqrt2 * p4 + 128 >> 8;
v2 = p2;
v3 = p6;
v4 = dctSqrt1d2 * (p1 - p7) + 128 >> 8;
v7 = dctSqrt1d2 * (p1 + p7) + 128 >> 8;
v5 = p3 << 4;
v6 = p5 << 4;
v0 = v0 + v1 + 1 >> 1;
v1 = v0 - v1;
t = v2 * dctSin6 + v3 * dctCos6 + 128 >> 8;
v2 = v2 * dctCos6 - v3 * dctSin6 + 128 >> 8;
v3 = t;
v4 = v4 + v6 + 1 >> 1;
v6 = v4 - v6;
v7 = v7 + v5 + 1 >> 1;
v5 = v7 - v5;
v0 = v0 + v3 + 1 >> 1;
v3 = v0 - v3;
v1 = v1 + v2 + 1 >> 1;
v2 = v1 - v2;
t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
v7 = t;
t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
v6 = t;
p[row] = v0 + v7;
p[row + 7] = v0 - v7;
p[row + 1] = v1 + v6;
p[row + 6] = v1 - v6;
p[row + 2] = v2 + v5;
p[row + 5] = v2 - v5;
p[row + 3] = v3 + v4;
p[row + 4] = v3 - v4;
}
for (var col = 0; col < 8; ++col) {
p0 = p[col];
p1 = p[col + 8];
p2 = p[col + 16];
p3 = p[col + 24];
p4 = p[col + 32];
p5 = p[col + 40];
p6 = p[col + 48];
p7 = p[col + 56];
if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {
t = dctSqrt2 * p0 + 8192 >> 14;
t = t < -2040 ? 0 : t >= 2024 ? 255 : t + 2056 >> 4;
blockData[blockBufferOffset + col] = t;
blockData[blockBufferOffset + col + 8] = t;
blockData[blockBufferOffset + col + 16] = t;
blockData[blockBufferOffset + col + 24] = t;
blockData[blockBufferOffset + col + 32] = t;
blockData[blockBufferOffset + col + 40] = t;
blockData[blockBufferOffset + col + 48] = t;
blockData[blockBufferOffset + col + 56] = t;
continue;
}
v0 = dctSqrt2 * p0 + 2048 >> 12;
v1 = dctSqrt2 * p4 + 2048 >> 12;
v2 = p2;
v3 = p6;
v4 = dctSqrt1d2 * (p1 - p7) + 2048 >> 12;
v7 = dctSqrt1d2 * (p1 + p7) + 2048 >> 12;
v5 = p3;
v6 = p5;
v0 = (v0 + v1 + 1 >> 1) + 4112;
v1 = v0 - v1;
t = v2 * dctSin6 + v3 * dctCos6 + 2048 >> 12;
v2 = v2 * dctCos6 - v3 * dctSin6 + 2048 >> 12;
v3 = t;
v4 = v4 + v6 + 1 >> 1;
v6 = v4 - v6;
v7 = v7 + v5 + 1 >> 1;
v5 = v7 - v5;
v0 = v0 + v3 + 1 >> 1;
v3 = v0 - v3;
v1 = v1 + v2 + 1 >> 1;
v2 = v1 - v2;
t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
v7 = t;
t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
v6 = t;
p0 = v0 + v7;
p7 = v0 - v7;
p1 = v1 + v6;
p6 = v1 - v6;
p2 = v2 + v5;
p5 = v2 - v5;
p3 = v3 + v4;
p4 = v3 - v4;
p0 = p0 < 16 ? 0 : p0 >= 4080 ? 255 : p0 >> 4;
p1 = p1 < 16 ? 0 : p1 >= 4080 ? 255 : p1 >> 4;
p2 = p2 < 16 ? 0 : p2 >= 4080 ? 255 : p2 >> 4;
p3 = p3 < 16 ? 0 : p3 >= 4080 ? 255 : p3 >> 4;
p4 = p4 < 16 ? 0 : p4 >= 4080 ? 255 : p4 >> 4;
p5 = p5 < 16 ? 0 : p5 >= 4080 ? 255 : p5 >> 4;
p6 = p6 < 16 ? 0 : p6 >= 4080 ? 255 : p6 >> 4;
p7 = p7 < 16 ? 0 : p7 >= 4080 ? 255 : p7 >> 4;
blockData[blockBufferOffset + col] = p0;
blockData[blockBufferOffset + col + 8] = p1;
blockData[blockBufferOffset + col + 16] = p2;
blockData[blockBufferOffset + col + 24] = p3;
blockData[blockBufferOffset + col + 32] = p4;
blockData[blockBufferOffset + col + 40] = p5;
blockData[blockBufferOffset + col + 48] = p6;
blockData[blockBufferOffset + col + 56] = p7;
}
}
function buildComponentData(frame, component) {
var blocksPerLine = component.blocksPerLine;
var blocksPerColumn = component.blocksPerColumn;
var computationBuffer = new Int16Array(64);
for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {
var offset = getBlockBufferOffset(component, blockRow, blockCol);
quantizeAndInverse(component, offset, computationBuffer);
}
}
return component.blockData;
}
function clamp0to255(a) {
return a <= 0 ? 0 : a >= 255 ? 255 : a;
}
constructor.prototype = {
parse: function parse(data) {
function readUint16() {
var value = data[offset] << 8 | data[offset + 1];
offset += 2;
return value;
}
function readDataBlock() {
var length = readUint16();
var array = data.subarray(offset, offset + length - 2);
offset += array.length;
return array;
}
function prepareComponents(frame) {
var mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / frame.maxH);
var mcusPerColumn = Math.ceil(frame.scanLines / 8 / frame.maxV);
for (var i = 0; i < frame.components.length; i++) {
component = frame.components[i];
var blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / frame.maxH);
var blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines / 8) * component.v / frame.maxV);
var blocksPerLineForMcu = mcusPerLine * component.h;
var blocksPerColumnForMcu = mcusPerColumn * component.v;
var blocksBufferSize = 64 * blocksPerColumnForMcu * (blocksPerLineForMcu + 1);
component.blockData = new Int16Array(blocksBufferSize);
component.blocksPerLine = blocksPerLine;
component.blocksPerColumn = blocksPerColumn;
}
frame.mcusPerLine = mcusPerLine;
frame.mcusPerColumn = mcusPerColumn;
}
var offset = 0, length = data.length;
var jfif = null;
var adobe = null;
var pixels = null;
var frame, resetInterval;
var quantizationTables = [];
var huffmanTablesAC = [], huffmanTablesDC = [];
var fileMarker = readUint16();
if (fileMarker !== 65496) {
throw "SOI not found";
}
fileMarker = readUint16();
while (fileMarker !== 65497) {
var i, j, l;
switch (fileMarker) {
case 65504:
case 65505:
case 65506:
case 65507:
case 65508:
case 65509:
case 65510:
case 65511:
case 65512:
case 65513:
case 65514:
case 65515:
case 65516:
case 65517:
case 65518:
case 65519:
case 65534:
var appData = readDataBlock();
if (fileMarker === 65504) {
if (appData[0] === 74 && appData[1] === 70 && appData[2] === 73 && appData[3] === 70 && appData[4] === 0) {
jfif = {
version: {
major: appData[5],
minor: appData[6]
},
densityUnits: appData[7],
xDensity: appData[8] << 8 | appData[9],
yDensity: appData[10] << 8 | appData[11],
thumbWidth: appData[12],
thumbHeight: appData[13],
thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
};
}
}
if (fileMarker === 65518) {
if (appData[0] === 65 && appData[1] === 100 && appData[2] === 111 && appData[3] === 98 && appData[4] === 101 && appData[5] === 0) {
adobe = {
version: appData[6],
flags0: appData[7] << 8 | appData[8],
flags1: appData[9] << 8 | appData[10],
transformCode: appData[11]
};
}
}
break;
case 65499:
var quantizationTablesLength = readUint16();
var quantizationTablesEnd = quantizationTablesLength + offset - 2;
var z;
while (offset < quantizationTablesEnd) {
var quantizationTableSpec = data[offset++];
var tableData = new Uint16Array(64);
if (quantizationTableSpec >> 4 === 0) {
for (j = 0; j < 64; j++) {
z = dctZigZag[j];
tableData[z] = data[offset++];
}
} else if (quantizationTableSpec >> 4 === 1) {
for (j = 0; j < 64; j++) {
z = dctZigZag[j];
tableData[z] = readUint16();
}
} else {
throw "DQT: invalid table spec";
}
quantizationTables[quantizationTableSpec & 15] = tableData;
}
break;
case 65472:
case 65473:
case 65474:
if (frame) {
throw "Only single frame JPEGs supported";
}
readUint16();
frame = {};
frame.extended = fileMarker === 65473;
frame.progressive = fileMarker === 65474;
frame.precision = data[offset++];
frame.scanLines = readUint16();
frame.samplesPerLine = readUint16();
frame.components = [];
frame.componentIds = {};
var componentsCount = data[offset++], componentId;
var maxH = 0, maxV = 0;
for (i = 0; i < componentsCount; i++) {
componentId = data[offset];
var h = data[offset + 1] >> 4;
var v = data[offset + 1] & 15;
if (maxH < h) {
maxH = h;
}
if (maxV < v) {
maxV = v;
}
var qId = data[offset + 2];
l = frame.components.push({
h: h,
v: v,
quantizationTable: quantizationTables[qId]
});
frame.componentIds[componentId] = l - 1;
offset += 3;
}
frame.maxH = maxH;
frame.maxV = maxV;
prepareComponents(frame);
break;
case 65476:
var huffmanLength = readUint16();
for (i = 2; i < huffmanLength; ) {
var huffmanTableSpec = data[offset++];
var codeLengths = new Uint8Array(16);
var codeLengthSum = 0;
for (j = 0; j < 16; j++, offset++) {
codeLengthSum += codeLengths[j] = data[offset];
}
var huffmanValues = new Uint8Array(codeLengthSum);
for (j = 0; j < codeLengthSum; j++, offset++) {
huffmanValues[j] = data[offset];
}
i += 17 + codeLengthSum;
(huffmanTableSpec >> 4 === 0 ? huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] = buildHuffmanTable(codeLengths, huffmanValues);
}
break;
case 65501:
readUint16();
resetInterval = readUint16();
break;
case 65498:
var scanLength = readUint16();
var selectorsCount = data[offset++];
var components = [], component;
for (i = 0; i < selectorsCount; i++) {
var componentIndex = frame.componentIds[data[offset++]];
component = frame.components[componentIndex];
var tableSpec = data[offset++];
component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
components.push(component);
}
var spectralStart = data[offset++];
var spectralEnd = data[offset++];
var successiveApproximation = data[offset++];
var processed = decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successiveApproximation >> 4, successiveApproximation & 15);
offset += processed;
break;
case 65535:
if (data[offset] !== 255) {
offset--;
}
break;
default:
if (data[offset - 3] === 255 && data[offset - 2] >= 192 && data[offset - 2] <= 254) {
offset -= 3;
break;
}
throw "unknown JPEG marker " + fileMarker.toString(16);
}
fileMarker = readUint16();
}
this.width = frame.samplesPerLine;
this.height = frame.scanLines;
this.jfif = jfif;
this.adobe = adobe;
this.components = [];
for (i = 0; i < frame.components.length; i++) {
component = frame.components[i];
this.components.push({
output: buildComponentData(frame, component),
scaleX: component.h / frame.maxH,
scaleY: component.v / frame.maxV,
blocksPerLine: component.blocksPerLine,
blocksPerColumn: component.blocksPerColumn
});
}
this.numComponents = this.components.length;
},
_getLinearizedBlockData: function getLinearizedBlockData(width, height) {
var scaleX = this.width / width, scaleY = this.height / height;
var component, componentScaleX, componentScaleY, blocksPerScanline;
var x, y, i, j, k;
var index;
var offset = 0;
var output;
var numComponents = this.components.length;
var dataLength = width * height * numComponents;
var data = new Uint8Array(dataLength);
var xScaleBlockOffset = new Uint32Array(width);
var mask3LSB = 4294967288;
for (i = 0; i < numComponents; i++) {
component = this.components[i];
componentScaleX = component.scaleX * scaleX;
componentScaleY = component.scaleY * scaleY;
offset = i;
output = component.output;
blocksPerScanline = component.blocksPerLine + 1 << 3;
for (x = 0; x < width; x++) {
j = 0 | x * componentScaleX;
xScaleBlockOffset[x] = (j & mask3LSB) << 3 | j & 7;
}
for (y = 0; y < height; y++) {
j = 0 | y * componentScaleY;
index = blocksPerScanline * (j & mask3LSB) | (j & 7) << 3;
for (x = 0; x < width; x++) {
data[offset] = output[index + xScaleBlockOffset[x]];
offset += numComponents;
}
}
}
var transform = this.decodeTransform;
if (transform) {
for (i = 0; i < dataLength; ) {
for (j = 0, k = 0; j < numComponents; j++, i++, k += 2) {
data[i] = (data[i] * transform[k] >> 8) + transform[k + 1];
}
}
}
return data;
},
_isColorConversionNeeded: function isColorConversionNeeded() {
if (this.adobe && this.adobe.transformCode) {
return true;
} else if (this.numComponents === 3) {
return true;
} else {
return false;
}
},
_convertYccToRgb: function convertYccToRgb(data) {
var Y, Cb, Cr;
for (var i = 0, length = data.length; i < length; i += 3) {
Y = data[i];
Cb = data[i + 1];
Cr = data[i + 2];
data[i] = clamp0to255(Y - 179.456 + 1.402 * Cr);
data[i + 1] = clamp0to255(Y + 135.459 - .344 * Cb - .714 * Cr);
data[i + 2] = clamp0to255(Y - 226.816 + 1.772 * Cb);
}
return data;
},
_convertYcckToRgb: function convertYcckToRgb(data) {
var Y, Cb, Cr, k;
var offset = 0;
for (var i = 0, length = data.length; i < length; i += 4) {
Y = data[i];
Cb = data[i + 1];
Cr = data[i + 2];
k = data[i + 3];
var r = -122.67195406894 + Cb * (-660635669420364e-19 * Cb + .000437130475926232 * Cr - 54080610064599e-18 * Y + .00048449797120281 * k - .154362151871126) + Cr * (-.000957964378445773 * Cr + .000817076911346625 * Y - .00477271405408747 * k + 1.53380253221734) + Y * (.000961250184130688 * Y - .00266257332283933 * k + .48357088451265) + k * (-.000336197177618394 * k + .484791561490776);
var g = 107.268039397724 + Cb * (219927104525741e-19 * Cb - .000640992018297945 * Cr + .000659397001245577 * Y + .000426105652938837 * k - .176491792462875) + Cr * (-.000778269941513683 * Cr + .00130872261408275 * Y + .000770482631801132 * k - .151051492775562) + Y * (.00126935368114843 * Y - .00265090189010898 * k + .25802910206845) + k * (-.000318913117588328 * k - .213742400323665);
var b = -20.810012546947 + Cb * (-.000570115196973677 * Cb - 263409051004589e-19 * Cr + .0020741088115012 * Y - .00288260236853442 * k + .814272968359295) + Cr * (-153496057440975e-19 * Cr - .000132689043961446 * Y + .000560833691242812 * k - .195152027534049) + Y * (.00174418132927582 * Y - .00255243321439347 * k + .116935020465145) + k * (-.000343531996510555 * k + .24165260232407);
data[offset++] = clamp0to255(r);
data[offset++] = clamp0to255(g);
data[offset++] = clamp0to255(b);
}
return data;
},
_convertYcckToCmyk: function convertYcckToCmyk(data) {
var Y, Cb, Cr;
for (var i = 0, length = data.length; i < length; i += 4) {
Y = data[i];
Cb = data[i + 1];
Cr = data[i + 2];
data[i] = clamp0to255(434.456 - Y - 1.402 * Cr);
data[i + 1] = clamp0to255(119.541 - Y + .344 * Cb + .714 * Cr);
data[i + 2] = clamp0to255(481.816 - Y - 1.772 * Cb);
}
return data;
},
_convertCmykToRgb: function convertCmykToRgb(data) {
var c, m, y, k;
var offset = 0;
var min = -255 * 255 * 255;
var scale = 1 / 255 / 255;
for (var i = 0, length = data.length; i < length; i += 4) {
c = data[i];
m = data[i + 1];
y = data[i + 2];
k = data[i + 3];
var r = c * (-4.387332384609988 * c + 54.48615194189176 * m + 18.82290502165302 * y + 212.25662451639585 * k - 72734.4411664936) + m * (1.7149763477362134 * m - 5.6096736904047315 * y - 17.873870861415444 * k - 1401.7366389350734) + y * (-2.5217340131683033 * y - 21.248923337353073 * k + 4465.541406466231) - k * (21.86122147463605 * k + 48317.86113160301);
var g = c * (8.841041422036149 * c + 60.118027045597366 * m + 6.871425592049007 * y + 31.159100130055922 * k - 20220.756542821975) + m * (-15.310361306967817 * m + 17.575251261109482 * y + 131.35250912493976 * k - 48691.05921601825) + y * (4.444339102852739 * y + 9.8632861493405 * k - 6341.191035517494) - k * (20.737325471181034 * k + 47890.15695978492);
var b = c * (.8842522430003296 * c + 8.078677503112928 * m + 30.89978309703729 * y - .23883238689178934 * k - 3616.812083916688) + m * (10.49593273432072 * m + 63.02378494754052 * y + 50.606957656360734 * k - 28620.90484698408) + y * (.03296041114873217 * y + 115.60384449646641 * k - 49363.43385999684) - k * (22.33816807309886 * k + 45932.16563550634);
data[offset++] = r >= 0 ? 255 : r <= min ? 0 : 255 + r * scale | 0;
data[offset++] = g >= 0 ? 255 : g <= min ? 0 : 255 + g * scale | 0;
data[offset++] = b >= 0 ? 255 : b <= min ? 0 : 255 + b * scale | 0;
}
return data;
},
getData: function getData(width, height, forceRGBoutput) {
if (this.numComponents > 4) {
throw "Unsupported color mode";
}
var data = this._getLinearizedBlockData(width, height);
if (this.numComponents === 3) {
return this._convertYccToRgb(data);
} else if (this.numComponents === 4) {
if (this._isColorConversionNeeded()) {
if (forceRGBoutput) {
return this._convertYcckToRgb(data);
} else {
return this._convertYcckToCmyk(data);
}
} else if (forceRGBoutput) {
return this._convertCmykToRgb(data);
}
}
return data;
}
};
return constructor;
}();
"use strict";
var ArithmeticDecoder = function ArithmeticDecoderClosure() {
var QeTable = [ {
qe: 22017,
nmps: 1,
nlps: 1,
switchFlag: 1
}, {
qe: 13313,
nmps: 2,
nlps: 6,
switchFlag: 0
}, {
qe: 6145,
nmps: 3,
nlps: 9,
switchFlag: 0
}, {
qe: 2753,
nmps: 4,
nlps: 12,
switchFlag: 0
}, {
qe: 1313,
nmps: 5,
nlps: 29,
switchFlag: 0
}, {
qe: 545,
nmps: 38,
nlps: 33,
switchFlag: 0
}, {
qe: 22017,
nmps: 7,
nlps: 6,
switchFlag: 1
}, {
qe: 21505,
nmps: 8,
nlps: 14,
switchFlag: 0
}, {
qe: 18433,
nmps: 9,
nlps: 14,
switchFlag: 0
}, {
qe: 14337,
nmps: 10,
nlps: 14,
switchFlag: 0
}, {
qe: 12289,
nmps: 11,
nlps: 17,
switchFlag: 0
}, {
qe: 9217,
nmps: 12,
nlps: 18,
switchFlag: 0
}, {
qe: 7169,
nmps: 13,
nlps: 20,
switchFlag: 0
}, {
qe: 5633,
nmps: 29,
nlps: 21,
switchFlag: 0
}, {
qe: 22017,
nmps: 15,
nlps: 14,
switchFlag: 1
}, {
qe: 21505,
nmps: 16,
nlps: 14,
switchFlag: 0
}, {
qe: 20737,
nmps: 17,
nlps: 15,
switchFlag: 0
}, {
qe: 18433,
nmps: 18,
nlps: 16,
switchFlag: 0
}, {
qe: 14337,
nmps: 19,
nlps: 17,
switchFlag: 0
}, {
qe: 13313,
nmps: 20,
nlps: 18,
switchFlag: 0
}, {
qe: 12289,
nmps: 21,
nlps: 19,
switchFlag: 0
}, {
qe: 10241,
nmps: 22,
nlps: 19,
switchFlag: 0
}, {
qe: 9217,
nmps: 23,
nlps: 20,
switchFlag: 0
}, {
qe: 8705,
nmps: 24,
nlps: 21,
switchFlag: 0
}, {
qe: 7169,
nmps: 25,
nlps: 22,
switchFlag: 0
}, {
qe: 6145,
nmps: 26,
nlps: 23,
switchFlag: 0
}, {
qe: 5633,
nmps: 27,
nlps: 24,
switchFlag: 0
}, {
qe: 5121,
nmps: 28,
nlps: 25,
switchFlag: 0
}, {
qe: 4609,
nmps: 29,
nlps: 26,
switchFlag: 0
}, {
qe: 4353,
nmps: 30,
nlps: 27,
switchFlag: 0
}, {
qe: 2753,
nmps: 31,
nlps: 28,
switchFlag: 0
}, {
qe: 2497,
nmps: 32,
nlps: 29,
switchFlag: 0
}, {
qe: 2209,
nmps: 33,
nlps: 30,
switchFlag: 0
}, {
qe: 1313,
nmps: 34,
nlps: 31,
switchFlag: 0
}, {
qe: 1089,
nmps: 35,
nlps: 32,
switchFlag: 0
}, {
qe: 673,
nmps: 36,
nlps: 33,
switchFlag: 0
}, {
qe: 545,
nmps: 37,
nlps: 34,
switchFlag: 0
}, {
qe: 321,
nmps: 38,
nlps: 35,
switchFlag: 0
}, {
qe: 273,
nmps: 39,
nlps: 36,
switchFlag: 0
}, {
qe: 133,
nmps: 40,
nlps: 37,
switchFlag: 0
}, {
qe: 73,
nmps: 41,
nlps: 38,
switchFlag: 0
}, {
qe: 37,
nmps: 42,
nlps: 39,
switchFlag: 0
}, {
qe: 21,
nmps: 43,
nlps: 40,
switchFlag: 0
}, {
qe: 9,
nmps: 44,
nlps: 41,
switchFlag: 0
}, {
qe: 5,
nmps: 45,
nlps: 42,
switchFlag: 0
}, {
qe: 1,
nmps: 45,
nlps: 43,
switchFlag: 0
}, {
qe: 22017,
nmps: 46,
nlps: 46,
switchFlag: 0
} ];
function ArithmeticDecoder(data, start, end) {
this.data = data;
this.bp = start;
this.dataEnd = end;
this.chigh = data[start];
this.clow = 0;
this.byteIn();
this.chigh = this.chigh << 7 & 65535 | this.clow >> 9 & 127;
this.clow = this.clow << 7 & 65535;
this.ct -= 7;
this.a = 32768;
}
ArithmeticDecoder.prototype = {
byteIn: function ArithmeticDecoder_byteIn() {
var data = this.data;
var bp = this.bp;
if (data[bp] === 255) {
var b1 = data[bp + 1];
if (b1 > 143) {
this.clow += 65280;
this.ct = 8;
} else {
bp++;
this.clow += data[bp] << 9;
this.ct = 7;
this.bp = bp;
}
} else {
bp++;
this.clow += bp < this.dataEnd ? data[bp] << 8 : 65280;
this.ct = 8;
this.bp = bp;
}
if (this.clow > 65535) {
this.chigh += this.clow >> 16;
this.clow &= 65535;
}
},
readBit: function ArithmeticDecoder_readBit(contexts, pos) {
var cx_index = contexts[pos] >> 1, cx_mps = contexts[pos] & 1;
var qeTableIcx = QeTable[cx_index];
var qeIcx = qeTableIcx.qe;
var d;
var a = this.a - qeIcx;
if (this.chigh < qeIcx) {
if (a < qeIcx) {
a = qeIcx;
d = cx_mps;
cx_index = qeTableIcx.nmps;
} else {
a = qeIcx;
d = 1 ^ cx_mps;
if (qeTableIcx.switchFlag === 1) {
cx_mps = d;
}
cx_index = qeTableIcx.nlps;
}
} else {
this.chigh -= qeIcx;
if ((a & 32768) !== 0) {
this.a = a;
return cx_mps;
}
if (a < qeIcx) {
d = 1 ^ cx_mps;
if (qeTableIcx.switchFlag === 1) {
cx_mps = d;
}
cx_index = qeTableIcx.nlps;
} else {
d = cx_mps;
cx_index = qeTableIcx.nmps;
}
}
do {
if (this.ct === 0) {
this.byteIn();
}
a <<= 1;
this.chigh = this.chigh << 1 & 65535 | this.clow >> 15 & 1;
this.clow = this.clow << 1 & 65535;
this.ct--;
} while ((a & 32768) === 0);
this.a = a;
contexts[pos] = cx_index << 1 | cx_mps;
return d;
}
};
return ArithmeticDecoder;
}();
"use strict";
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 = readUint16(data, 0);
if (head === 65359) {
this.parseCodestream(data, 0, data.length);
return;
}
var position = 0, length = data.length;
while (position < length) {
var headerSize = 8;
var lbox = readUint32(data, position);
var tbox = readUint32(data, position + 4);
position += headerSize;
if (lbox === 1) {
lbox = readUint32(data, position) * 4294967296 + readUint32(data, position + 4);
position += 8;
headerSize += 8;
}
if (lbox === 0) {
lbox = length - position + headerSize;
}
if (lbox < headerSize) {
throw new Error("JPX Error: Invalid box field size");
}
var dataLength = lbox - headerSize;
var jumpDataLength = true;
switch (tbox) {
case 1785737832:
jumpDataLength = false;
break;
case 1668246642:
var method = data[position];
var precedence = data[position + 1];
var approximation = data[position + 2];
if (method === 1) {
var colorspace = readUint32(data, position + 3);
switch (colorspace) {
case 16:
case 17:
case 18:
break;
default:
warn("Unknown colorspace " + colorspace);
break;
}
} else if (method === 2) {
info("ICC profile not supported");
}
break;
case 1785737827:
this.parseCodestream(data, position, position + dataLength);
break;
case 1783636e3:
if (218793738 !== readUint32(data, position)) {
warn("Invalid JP2 signature");
}
break;
case 1783634458:
case 1718909296:
case 1920099697:
case 1919251232:
case 1768449138:
break;
default:
var headerType = String.fromCharCode(tbox >> 24 & 255, tbox >> 16 & 255, tbox >> 8 & 255, tbox & 255);
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 === 65361) {
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 Error("JPX Error: No size marker found in JPX stream");
},
parseCodestream: function JpxImage_parseCodestream(data, start, end) {
var context = {};
try {
var doNotRecover = false;
var position = start;
while (position + 1 < end) {
var code = readUint16(data, position);
position += 2;
var length = 0, j, sqcd, spqcds, spqcdSize, scalarExpounded, tile;
switch (code) {
case 65359:
context.mainHeader = true;
break;
case 65497:
break;
case 65361:
length = readUint16(data, position);
var siz = {};
siz.Xsiz = readUint32(data, position + 4);
siz.Ysiz = readUint32(data, position + 8);
siz.XOsiz = readUint32(data, position + 12);
siz.YOsiz = readUint32(data, position + 16);
siz.XTsiz = readUint32(data, position + 20);
siz.YTsiz = readUint32(data, position + 24);
siz.XTOsiz = readUint32(data, position + 28);
siz.YTOsiz = readUint32(data, position + 32);
var componentsCount = readUint16(data, position + 36);
siz.Csiz = componentsCount;
var components = [];
j = position + 38;
for (var i = 0; i < componentsCount; i++) {
var component = {
precision: (data[j] & 127) + 1,
isSigned: !!(data[j] & 128),
XRsiz: data[j + 1],
YRsiz: data[j + 1]
};
calculateComponentDimensions(component, siz);
components.push(component);
}
context.SIZ = siz;
context.components = components;
calculateTileGrids(context, components);
context.QCC = [];
context.COC = [];
break;
case 65372:
length = readUint16(data, position);
var qcd = {};
j = position + 2;
sqcd = data[j++];
switch (sqcd & 31) {
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("JPX 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] & 7) << 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 65373:
length = readUint16(data, position);
var qcc = {};
j = position + 2;
var cqcc;
if (context.SIZ.Csiz < 257) {
cqcc = data[j++];
} else {
cqcc = readUint16(data, j);
j += 2;
}
sqcd = data[j++];
switch (sqcd & 31) {
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("JPX 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] & 7) << 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 65362:
length = 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 = readUint16(data, j);
j += 2;
cod.multipleComponentTransform = data[j++];
cod.decompositionLevelsCount = data[j++];
cod.xcb = (data[j++] & 15) + 2;
cod.ycb = (data[j++] & 15) + 2;
var blockStyle = data[j++];
cod.selectiveArithmeticCodingBypass = !!(blockStyle & 1);
cod.resetContextProbabilities = !!(blockStyle & 2);
cod.terminationOnEachCodingPass = !!(blockStyle & 4);
cod.verticalyStripe = !!(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 & 15,
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.verticalyStripe) {
unsupported.push("verticalyStripe");
}
if (cod.predictableTermination) {
unsupported.push("predictableTermination");
}
if (unsupported.length > 0) {
doNotRecover = true;
throw new Error("JPX Error: Unsupported COD options (" + unsupported.join(", ") + ")");
}
if (context.mainHeader) {
context.COD = cod;
} else {
context.currentTile.COD = cod;
context.currentTile.COC = [];
}
break;
case 65424:
length = readUint16(data, position);
tile = {};
tile.index = readUint16(data, position + 2);
tile.length = 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 65427:
tile = context.currentTile;
if (tile.partIndex === 0) {
initializeTile(context, tile.index);
buildPackets(context);
}
length = tile.dataEnd - position;
parseTilePackets(context, data, position, length);
break;
case 65365:
case 65367:
case 65368:
case 65380:
length = readUint16(data, position);
break;
case 65363:
throw new Error("JPX Error: Codestream code 0xFF53 (COC) is " + "not implemented");
default:
throw new Error("JPX Error: Unknown codestream code: " + code.toString(16));
}
position += length;
}
} catch (e) {
if (doNotRecover || this.failOnCorruptedImage) {
throw e;
} else {
warn("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: precinctWidth,
precinctHeight: precinctHeight,
numprecinctswide: numprecinctswide,
numprecinctshigh: numprecinctshigh,
numprecincts: numprecincts,
precinctWidthInSubband: precinctWidthInSubband,
precinctHeightInSubband: 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: 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 Error("JPX Error: 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 Error("JPX Error: 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++) {
var 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++) {
var 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 Error("JPX Error: 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 Error("JPX Error: 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 Error("JPX Error: 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: minWidth,
minHeight: minHeight,
maxNumWide: maxNumWide,
maxNumHigh: 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 - .5);
subband.tby0 = Math.ceil(component.tcy0 / bscale);
subband.tbx1 = Math.ceil(component.tcx1 / bscale - .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 - .5);
subband.tbx1 = Math.ceil(component.tcx1 / bscale);
subband.tby1 = Math.ceil(component.tcy1 / bscale - .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 - .5);
subband.tby0 = Math.ceil(component.tcy0 / bscale - .5);
subband.tbx1 = Math.ceil(component.tcx1 / bscale - .5);
subband.tby1 = Math.ceil(component.tcy1 / bscale - .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 Error("JPX Error: 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 === 255) {
skipNextBit = true;
}
}
bufferSize -= count;
return buffer >>> bufferSize & (1 << count) - 1;
}
function skipMarkerIfEqual(value) {
if (data[offset + position - 1] === 255 && data[offset + position] === value) {
skipBytes(1);
return true;
} else if (data[offset + position] === 255 && 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(145)) {
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 = log2(codingpasses);
var bits = (codingpasses < 1 << codingpassesLog2 ? codingpassesLog2 - 1 : codingpassesLog2) + codeblock.Lblock;
var codedDataLength = readBits(bits);
queue.push({
codeblock: codeblock,
codingpasses: codingpasses,
dataLength: codedDataLength
});
}
alignToByte();
if (ephMarkerUsed) {
skipMarkerIfEqual(146);
}
while (queue.length > 0) {
var packetItem = queue.shift();
codeblock = packetItem.codeblock;
if (codeblock["data"] === undefined) {
codeblock.data = [];
}
codeblock.data.push({
data: 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 ArithmeticDecoder(encodedData, 0, totalLength);
bitModel.setDecoder(decoder);
for (j = 0; j < codingpasses; j++) {
switch (currentCodingpassType) {
case 0:
bitModel.runSignificancePropogationPass();
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 : .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 : Math.pow(2, precision + gainLog2 - epsilon) * (1 + mu / 2048);
var mb = guardBits + epsilon - 1;
copyCoefficients(coefficients, width, height, subband, delta, mb, reversible, segmentationSymbolUsed);
}
subbandCoefficients.push({
width: width,
height: 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 Uint8Array(tile0.items.length * componentsCount);
var result = {
left: tile0.left,
top: tile0.top,
width: tile0.width,
height: tile0.height,
items: out
};
var shift, offset, max, min, maxK;
var pos = 0, j, jj, y0, y1, y2, r, g, b, k, val;
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) + .5;
max = 255 * (1 << shift);
maxK = max * .5;
min = -maxK;
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];
r = y0 + 1.402 * y2;
g = y0 - .34413 * y1 - .71414 * y2;
b = y0 + 1.772 * y1;
out[pos++] = r <= 0 ? 0 : r >= max ? 255 : r >> shift;
out[pos++] = g <= 0 ? 0 : g >= max ? 255 : g >> shift;
out[pos++] = b <= 0 ? 0 : b >= max ? 255 : b >> shift;
}
} else {
for (j = 0; j < jj; j++, pos += alpha01) {
y0 = y0items[j] + offset;
y1 = y1items[j];
y2 = y2items[j];
g = y0 - (y2 + y1 >> 2);
r = g + y2;
b = g + y1;
out[pos++] = r <= 0 ? 0 : r >= max ? 255 : r >> shift;
out[pos++] = g <= 0 ? 0 : g >= max ? 255 : g >> shift;
out[pos++] = b <= 0 ? 0 : b >= max ? 255 : b >> shift;
}
}
if (fourComponents) {
for (j = 0, pos = 3; j < jj; j++, pos += 4) {
k = y3items[j];
out[pos] = k <= min ? 0 : k >= maxK ? 255 : k + offset >> shift;
}
}
} else {
for (c = 0; c < componentsCount; c++) {
var items = transformedTiles[c].items;
shift = components[c].precision - 8;
offset = (128 << shift) + .5;
max = 127.5 * (1 << shift);
min = -max;
for (pos = c, j = 0, jj = items.length; j < jj; j++) {
val = items[j];
out[pos] = val <= min ? 0 : val >= max ? 255 : val + 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 = log2(Math.max(width, height)) + 1;
this.levels = [];
for (var i = 0; i < levelsLength; i++) {
var level = {
width: width,
height: 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 = 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: width,
height: height,
items: 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 === 255) {
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] = 255;
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;
this.contextLabelTable = subband === "HH" ? HHContextLabel : subband === "HL" ? HLContextLabel : LLAndLHContextsLabel;
var coefficientCount = width * height;
this.neighborsSignificance = new Uint8Array(coefficientCount);
this.coefficentsSign = new Uint8Array(coefficientCount);
this.coefficentsMagnitude = mb > 14 ? new Uint32Array(coefficientCount) : mb > 6 ? new Uint16Array(coefficientCount) : new Uint8Array(coefficientCount);
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] += 16;
}
if (right) {
neighborsSignificance[i + 1] += 16;
}
neighborsSignificance[i] += 4;
}
if (row + 1 < height) {
i = index + width;
if (left) {
neighborsSignificance[i - 1] += 16;
}
if (right) {
neighborsSignificance[i + 1] += 16;
}
neighborsSignificance[i] += 4;
}
if (left) {
neighborsSignificance[index - 1] += 1;
}
if (right) {
neighborsSignificance[index + 1] += 1;
}
neighborsSignificance[index] |= 128;
},
runSignificancePropogationPass: function BitModel_runSignificancePropogationPass() {
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 !== 10) {
throw new Error("JPX Error: 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] *= .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] *= .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: width,
height: height,
items: 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 = -.052980118572961;
var gamma = .882911075530934;
var delta = .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;
}();
"use strict";
var Jbig2Image = function Jbig2ImageClosure() {
function ContextCache() {}
ContextCache.prototype = {
getContexts: function(id) {
if (id in this) {
return this[id];
}
return this[id] = new Int8Array(1 << 16);
}
};
function DecodingContext(data, start, end) {
this.data = data;
this.start = start;
this.end = end;
}
DecodingContext.prototype = {
get decoder() {
var decoder = new ArithmeticDecoder(this.data, this.start, this.end);
return shadow(this, "decoder", decoder);
},
get contextCache() {
var cache = new ContextCache();
return shadow(this, "contextCache", cache);
}
};
function decodeInteger(contextCache, procedure, decoder) {
var contexts = contextCache.getContexts(procedure);
var prev = 1;
function readBits(length) {
var v = 0;
for (var i = 0; i < length; i++) {
var bit = decoder.readBit(contexts, prev);
prev = prev < 256 ? prev << 1 | bit : (prev << 1 | bit) & 511 | 256;
v = v << 1 | bit;
}
return v >>> 0;
}
var sign = readBits(1);
var value = readBits(1) ? readBits(1) ? readBits(1) ? readBits(1) ? readBits(1) ? readBits(32) + 4436 : readBits(12) + 340 : readBits(8) + 84 : readBits(6) + 20 : readBits(4) + 4 : readBits(2);
return sign === 0 ? value : value > 0 ? -value : null;
}
function decodeIAID(contextCache, decoder, codeLength) {
var contexts = contextCache.getContexts("IAID");
var prev = 1;
for (var i = 0; i < codeLength; i++) {
var bit = decoder.readBit(contexts, prev);
prev = prev << 1 | bit;
}
if (codeLength < 31) {
return prev & (1 << codeLength) - 1;
}
return prev & 2147483647;
}
var SegmentTypes = [ "SymbolDictionary", null, null, null, "IntermediateTextRegion", null, "ImmediateTextRegion", "ImmediateLosslessTextRegion", null, null, null, null, null, null, null, null, "patternDictionary", null, null, null, "IntermediateHalftoneRegion", null, "ImmediateHalftoneRegion", "ImmediateLosslessHalftoneRegion", null, null, null, null, null, null, null, null, null, null, null, null, "IntermediateGenericRegion", null, "ImmediateGenericRegion", "ImmediateLosslessGenericRegion", "IntermediateGenericRefinementRegion", null, "ImmediateGenericRefinementRegion", "ImmediateLosslessGenericRefinementRegion", null, null, null, null, "PageInformation", "EndOfPage", "EndOfStripe", "EndOfFile", "Profiles", "Tables", null, null, null, null, null, null, null, null, "Extension" ];
var CodingTemplates = [ [ {
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: 2,
y: -1
}, {
x: -4,
y: 0
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
} ], [ {
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: 2,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: 2,
y: -1
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
} ], [ {
x: -1,
y: -2
}, {
x: 0,
y: -2
}, {
x: 1,
y: -2
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
} ], [ {
x: -3,
y: -1
}, {
x: -2,
y: -1
}, {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -4,
y: 0
}, {
x: -3,
y: 0
}, {
x: -2,
y: 0
}, {
x: -1,
y: 0
} ] ];
var RefinementTemplates = [ {
coding: [ {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
} ],
reference: [ {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
}, {
x: 0,
y: 0
}, {
x: 1,
y: 0
}, {
x: -1,
y: 1
}, {
x: 0,
y: 1
}, {
x: 1,
y: 1
} ]
}, {
coding: [ {
x: -1,
y: -1
}, {
x: 0,
y: -1
}, {
x: 1,
y: -1
}, {
x: -1,
y: 0
} ],
reference: [ {
x: 0,
y: -1
}, {
x: -1,
y: 0
}, {
x: 0,
y: 0
}, {
x: 1,
y: 0
}, {
x: 0,
y: 1
}, {
x: 1,
y: 1
} ]
} ];
var ReusedContexts = [ 39717, 1941, 229, 405 ];
var RefinementReusedContexts = [ 32, 8 ];
function decodeBitmapTemplate0(width, height, decodingContext) {
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts("GB");
var contextLabel, i, j, pixel, row, row1, row2, bitmap = [];
var OLD_PIXEL_MASK = 31735;
for (i = 0; i < height; i++) {
row = bitmap[i] = new Uint8Array(width);
row1 = i < 1 ? row : bitmap[i - 1];
row2 = i < 2 ? row : bitmap[i - 2];
contextLabel = row2[0] << 13 | row2[1] << 12 | row2[2] << 11 | row1[0] << 7 | row1[1] << 6 | row1[2] << 5 | row1[3] << 4;
for (j = 0; j < width; j++) {
row[j] = pixel = decoder.readBit(contexts, contextLabel);
contextLabel = (contextLabel & OLD_PIXEL_MASK) << 1 | (j + 3 < width ? row2[j + 3] << 11 : 0) | (j + 4 < width ? row1[j + 4] << 4 : 0) | pixel;
}
}
return bitmap;
}
function decodeBitmap(mmr, width, height, templateIndex, prediction, skip, at, decodingContext) {
if (mmr) {
error("JBIG2 error: MMR encoding is not supported");
}
if (templateIndex === 0 && !skip && !prediction && at.length === 4 && at[0].x === 3 && at[0].y === -1 && at[1].x === -3 && at[1].y === -1 && at[2].x === 2 && at[2].y === -2 && at[3].x === -2 && at[3].y === -2) {
return decodeBitmapTemplate0(width, height, decodingContext);
}
var useskip = !!skip;
var template = CodingTemplates[templateIndex].concat(at);
template.sort(function(a, b) {
return a.y - b.y || a.x - b.x;
});
var templateLength = template.length;
var templateX = new Int8Array(templateLength);
var templateY = new Int8Array(templateLength);
var changingTemplateEntries = [];
var reuseMask = 0, minX = 0, maxX = 0, minY = 0;
var c, k;
for (k = 0; k < templateLength; k++) {
templateX[k] = template[k].x;
templateY[k] = template[k].y;
minX = Math.min(minX, template[k].x);
maxX = Math.max(maxX, template[k].x);
minY = Math.min(minY, template[k].y);
if (k < templateLength - 1 && template[k].y === template[k + 1].y && template[k].x === template[k + 1].x - 1) {
reuseMask |= 1 << templateLength - 1 - k;
} else {
changingTemplateEntries.push(k);
}
}
var changingEntriesLength = changingTemplateEntries.length;
var changingTemplateX = new Int8Array(changingEntriesLength);
var changingTemplateY = new Int8Array(changingEntriesLength);
var changingTemplateBit = new Uint16Array(changingEntriesLength);
for (c = 0; c < changingEntriesLength; c++) {
k = changingTemplateEntries[c];
changingTemplateX[c] = template[k].x;
changingTemplateY[c] = template[k].y;
changingTemplateBit[c] = 1 << templateLength - 1 - k;
}
var sbb_left = -minX;
var sbb_top = -minY;
var sbb_right = width - maxX;
var pseudoPixelContext = ReusedContexts[templateIndex];
var row = new Uint8Array(width);
var bitmap = [];
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts("GB");
var ltp = 0, j, i0, j0, contextLabel = 0, bit, shift;
for (var i = 0; i < height; i++) {
if (prediction) {
var sltp = decoder.readBit(contexts, pseudoPixelContext);
ltp ^= sltp;
if (ltp) {
bitmap.push(row);
continue;
}
}
row = new Uint8Array(row);
bitmap.push(row);
for (j = 0; j < width; j++) {
if (useskip && skip[i][j]) {
row[j] = 0;
continue;
}
if (j >= sbb_left && j < sbb_right && i >= sbb_top) {
contextLabel = contextLabel << 1 & reuseMask;
for (k = 0; k < changingEntriesLength; k++) {
i0 = i + changingTemplateY[k];
j0 = j + changingTemplateX[k];
bit = bitmap[i0][j0];
if (bit) {
bit = changingTemplateBit[k];
contextLabel |= bit;
}
}
} else {
contextLabel = 0;
shift = templateLength - 1;
for (k = 0; k < templateLength; k++, shift--) {
j0 = j + templateX[k];
if (j0 >= 0 && j0 < width) {
i0 = i + templateY[k];
if (i0 >= 0) {
bit = bitmap[i0][j0];
if (bit) {
contextLabel |= bit << shift;
}
}
}
}
}
var pixel = decoder.readBit(contexts, contextLabel);
row[j] = pixel;
}
}
return bitmap;
}
function decodeRefinement(width, height, templateIndex, referenceBitmap, offsetX, offsetY, prediction, at, decodingContext) {
var codingTemplate = RefinementTemplates[templateIndex].coding;
if (templateIndex === 0) {
codingTemplate = codingTemplate.concat([ at[0] ]);
}
var codingTemplateLength = codingTemplate.length;
var codingTemplateX = new Int32Array(codingTemplateLength);
var codingTemplateY = new Int32Array(codingTemplateLength);
var k;
for (k = 0; k < codingTemplateLength; k++) {
codingTemplateX[k] = codingTemplate[k].x;
codingTemplateY[k] = codingTemplate[k].y;
}
var referenceTemplate = RefinementTemplates[templateIndex].reference;
if (templateIndex === 0) {
referenceTemplate = referenceTemplate.concat([ at[1] ]);
}
var referenceTemplateLength = referenceTemplate.length;
var referenceTemplateX = new Int32Array(referenceTemplateLength);
var referenceTemplateY = new Int32Array(referenceTemplateLength);
for (k = 0; k < referenceTemplateLength; k++) {
referenceTemplateX[k] = referenceTemplate[k].x;
referenceTemplateY[k] = referenceTemplate[k].y;
}
var referenceWidth = referenceBitmap[0].length;
var referenceHeight = referenceBitmap.length;
var pseudoPixelContext = RefinementReusedContexts[templateIndex];
var bitmap = [];
var decoder = decodingContext.decoder;
var contexts = decodingContext.contextCache.getContexts("GR");
var ltp = 0;
for (var i = 0; i < height; i++) {
if (prediction) {
var sltp = decoder.readBit(contexts, pseudoPixelContext);
ltp ^= sltp;
if (ltp) {
error("JBIG2 error: prediction is not supported");
}
}
var row = new Uint8Array(width);
bitmap.push(row);
for (var j = 0; j < width; j++) {
var i0, j0;
var contextLabel = 0;
for (k = 0; k < codingTemplateLength; k++) {
i0 = i + codingTemplateY[k];
j0 = j + codingTemplateX[k];
if (i0 < 0 || j0 < 0 || j0 >= width) {
contextLabel <<= 1;
} else {
contextLabel = contextLabel << 1 | bitmap[i0][j0];
}
}
for (k = 0; k < referenceTemplateLength; k++) {
i0 = i + referenceTemplateY[k] + offsetY;
j0 = j + referenceTemplateX[k] + offsetX;
if (i0 < 0 || i0 >= referenceHeight || j0 < 0 || j0 >= referenceWidth) {
contextLabel <<= 1;
} else {
contextLabel = contextLabel << 1 | referenceBitmap[i0][j0];
}
}
var pixel = decoder.readBit(contexts, contextLabel);
row[j] = pixel;
}
}
return bitmap;
}
function decodeSymbolDictionary(huffman, refinement, symbols, numberOfNewSymbols, numberOfExportedSymbols, huffmanTables, templateIndex, at, refinementTemplateIndex, refinementAt, decodingContext) {
if (huffman) {
error("JBIG2 error: huffman is not supported");
}
var newSymbols = [];
var currentHeight = 0;
var symbolCodeLength = log2(symbols.length + numberOfNewSymbols);
var decoder = decodingContext.decoder;
var contextCache = decodingContext.contextCache;
while (newSymbols.length < numberOfNewSymbols) {
var deltaHeight = decodeInteger(contextCache, "IADH", decoder);
currentHeight += deltaHeight;
var currentWidth = 0;
var totalWidth = 0;
while (true) {
var deltaWidth = decodeInteger(contextCache, "IADW", decoder);
if (deltaWidth === null) {
break;
}
currentWidth += deltaWidth;
totalWidth += currentWidth;
var bitmap;
if (refinement) {
var numberOfInstances = decodeInteger(contextCache, "IAAI", decoder);
if (numberOfInstances > 1) {
bitmap = decodeTextRegion(huffman, refinement, currentWidth, currentHeight, 0, numberOfInstances, 1, symbols.concat(newSymbols), symbolCodeLength, 0, 0, 1, 0, huffmanTables, refinementTemplateIndex, refinementAt, decodingContext);
} else {
var symbolId = decodeIAID(contextCache, decoder, symbolCodeLength);
var rdx = decodeInteger(contextCache, "IARDX", decoder);
var rdy = decodeInteger(contextCache, "IARDY", decoder);
var symbol = symbolId < symbols.length ? symbols[symbolId] : newSymbols[symbolId - symbols.length];
bitmap = decodeRefinement(currentWidth, currentHeight, refinementTemplateIndex, symbol, rdx, rdy, false, refinementAt, decodingContext);
}
} else {
bitmap = decodeBitmap(false, currentWidth, currentHeight, templateIndex, false, null, at, decodingContext);
}
newSymbols.push(bitmap);
}
}
var exportedSymbols = [];
var flags = [], currentFlag = false;
var totalSymbolsLength = symbols.length + numberOfNewSymbols;
while (flags.length < totalSymbolsLength) {
var runLength = decodeInteger(contextCache, "IAEX", decoder);
while (runLength--) {
flags.push(currentFlag);
}
currentFlag = !currentFlag;
}
for (var i = 0, ii = symbols.length; i < ii; i++) {
if (flags[i]) {
exportedSymbols.push(symbols[i]);
}
}
for (var j = 0; j < numberOfNewSymbols; i++, j++) {
if (flags[i]) {
exportedSymbols.push(newSymbols[j]);
}
}
return exportedSymbols;
}
function decodeTextRegion(huffman, refinement, width, height, defaultPixelValue, numberOfSymbolInstances, stripSize, inputSymbols, symbolCodeLength, transposed, dsOffset, referenceCorner, combinationOperator, huffmanTables, refinementTemplateIndex, refinementAt, decodingContext) {
if (huffman) {
error("JBIG2 error: huffman is not supported");
}
var bitmap = [];
var i, row;
for (i = 0; i < height; i++) {
row = new Uint8Array(width);
if (defaultPixelValue) {
for (var j = 0; j < width; j++) {
row[j] = defaultPixelValue;
}
}
bitmap.push(row);
}
var decoder = decodingContext.decoder;
var contextCache = decodingContext.contextCache;
var stripT = -decodeInteger(contextCache, "IADT", decoder);
var firstS = 0;
i = 0;
while (i < numberOfSymbolInstances) {
var deltaT = decodeInteger(contextCache, "IADT", decoder);
stripT += deltaT;
var deltaFirstS = decodeInteger(contextCache, "IAFS", decoder);
firstS += deltaFirstS;
var currentS = firstS;
do {
var currentT = stripSize === 1 ? 0 : decodeInteger(contextCache, "IAIT", decoder);
var t = stripSize * stripT + currentT;
var symbolId = decodeIAID(contextCache, decoder, symbolCodeLength);
var applyRefinement = refinement && decodeInteger(contextCache, "IARI", decoder);
var symbolBitmap = inputSymbols[symbolId];
var symbolWidth = symbolBitmap[0].length;
var symbolHeight = symbolBitmap.length;
if (applyRefinement) {
var rdw = decodeInteger(contextCache, "IARDW", decoder);
var rdh = decodeInteger(contextCache, "IARDH", decoder);
var rdx = decodeInteger(contextCache, "IARDX", decoder);
var rdy = decodeInteger(contextCache, "IARDY", decoder);
symbolWidth += rdw;
symbolHeight += rdh;
symbolBitmap = decodeRefinement(symbolWidth, symbolHeight, refinementTemplateIndex, symbolBitmap, (rdw >> 1) + rdx, (rdh >> 1) + rdy, false, refinementAt, decodingContext);
}
var offsetT = t - (referenceCorner & 1 ? 0 : symbolHeight);
var offsetS = currentS - (referenceCorner & 2 ? symbolWidth : 0);
var s2, t2, symbolRow;
if (transposed) {
for (s2 = 0; s2 < symbolHeight; s2++) {
row = bitmap[offsetS + s2];
if (!row) {
continue;
}
symbolRow = symbolBitmap[s2];
var maxWidth = Math.min(width - offsetT, symbolWidth);
switch (combinationOperator) {
case 0:
for (t2 = 0; t2 < maxWidth; t2++) {
row[offsetT + t2] |= symbolRow[t2];
}
break;
case 2:
for (t2 = 0; t2 < maxWidth; t2++) {
row[offsetT + t2] ^= symbolRow[t2];
}
break;
default:
error("JBIG2 error: operator " + combinationOperator + " is not supported");
}
}
currentS += symbolHeight - 1;
} else {
for (t2 = 0; t2 < symbolHeight; t2++) {
row = bitmap[offsetT + t2];
if (!row) {
continue;
}
symbolRow = symbolBitmap[t2];
switch (combinationOperator) {
case 0:
for (s2 = 0; s2 < symbolWidth; s2++) {
row[offsetS + s2] |= symbolRow[s2];
}
break;
case 2:
for (s2 = 0; s2 < symbolWidth; s2++) {
row[offsetS + s2] ^= symbolRow[s2];
}
break;
default:
error("JBIG2 error: operator " + combinationOperator + " is not supported");
}
}
currentS += symbolWidth - 1;
}
i++;
var deltaS = decodeInteger(contextCache, "IADS", decoder);
if (deltaS === null) {
break;
}
currentS += deltaS + dsOffset;
} while (true);
}
return bitmap;
}
function readSegmentHeader(data, start) {
var segmentHeader = {};
segmentHeader.number = readUint32(data, start);
var flags = data[start + 4];
var segmentType = flags & 63;
if (!SegmentTypes[segmentType]) {
error("JBIG2 error: invalid segment type: " + segmentType);
}
segmentHeader.type = segmentType;
segmentHeader.typeName = SegmentTypes[segmentType];
segmentHeader.deferredNonRetain = !!(flags & 128);
var pageAssociationFieldSize = !!(flags & 64);
var referredFlags = data[start + 5];
var referredToCount = referredFlags >> 5 & 7;
var retainBits = [ referredFlags & 31 ];
var position = start + 6;
if (referredFlags === 7) {
referredToCount = readUint32(data, position - 1) & 536870911;
position += 3;
var bytes = referredToCount + 7 >> 3;
retainBits[0] = data[position++];
while (--bytes > 0) {
retainBits.push(data[position++]);
}
} else if (referredFlags === 5 || referredFlags === 6) {
error("JBIG2 error: invalid referred-to flags");
}
segmentHeader.retainBits = retainBits;
var referredToSegmentNumberSize = segmentHeader.number <= 256 ? 1 : segmentHeader.number <= 65536 ? 2 : 4;
var referredTo = [];
var i, ii;
for (i = 0; i < referredToCount; i++) {
var number = referredToSegmentNumberSize === 1 ? data[position] : referredToSegmentNumberSize === 2 ? readUint16(data, position) : readUint32(data, position);
referredTo.push(number);
position += referredToSegmentNumberSize;
}
segmentHeader.referredTo = referredTo;
if (!pageAssociationFieldSize) {
segmentHeader.pageAssociation = data[position++];
} else {
segmentHeader.pageAssociation = readUint32(data, position);
position += 4;
}
segmentHeader.length = readUint32(data, position);
position += 4;
if (segmentHeader.length === 4294967295) {
if (segmentType === 38) {
var genericRegionInfo = readRegionSegmentInformation(data, position);
var genericRegionSegmentFlags = data[position + RegionSegmentInformationFieldLength];
var genericRegionMmr = !!(genericRegionSegmentFlags & 1);
var searchPatternLength = 6;
var searchPattern = new Uint8Array(searchPatternLength);
if (!genericRegionMmr) {
searchPattern[0] = 255;
searchPattern[1] = 172;
}
searchPattern[2] = genericRegionInfo.height >>> 24 & 255;
searchPattern[3] = genericRegionInfo.height >> 16 & 255;
searchPattern[4] = genericRegionInfo.height >> 8 & 255;
searchPattern[5] = genericRegionInfo.height & 255;
for (i = position, ii = data.length; i < ii; i++) {
var j = 0;
while (j < searchPatternLength && searchPattern[j] === data[i + j]) {
j++;
}
if (j === searchPatternLength) {
segmentHeader.length = i + searchPatternLength;
break;
}
}
if (segmentHeader.length === 4294967295) {
error("JBIG2 error: segment end was not found");
}
} else {
error("JBIG2 error: invalid unknown segment length");
}
}
segmentHeader.headerEnd = position;
return segmentHeader;
}
function readSegments(header, data, start, end) {
var segments = [];
var position = start;
while (position < end) {
var segmentHeader = readSegmentHeader(data, position);
position = segmentHeader.headerEnd;
var segment = {
header: segmentHeader,
data: data
};
if (!header.randomAccess) {
segment.start = position;
position += segmentHeader.length;
segment.end = position;
}
segments.push(segment);
if (segmentHeader.type === 51) {
break;
}
}
if (header.randomAccess) {
for (var i = 0, ii = segments.length; i < ii; i++) {
segments[i].start = position;
position += segments[i].header.length;
segments[i].end = position;
}
}
return segments;
}
function readRegionSegmentInformation(data, start) {
return {
width: readUint32(data, start),
height: readUint32(data, start + 4),
x: readUint32(data, start + 8),
y: readUint32(data, start + 12),
combinationOperator: data[start + 16] & 7
};
}
var RegionSegmentInformationFieldLength = 17;
function processSegment(segment, visitor) {
var header = segment.header;
var data = segment.data, position = segment.start, end = segment.end;
var args, at, i, atLength;
switch (header.type) {
case 0:
var dictionary = {};
var dictionaryFlags = readUint16(data, position);
dictionary.huffman = !!(dictionaryFlags & 1);
dictionary.refinement = !!(dictionaryFlags & 2);
dictionary.huffmanDHSelector = dictionaryFlags >> 2 & 3;
dictionary.huffmanDWSelector = dictionaryFlags >> 4 & 3;
dictionary.bitmapSizeSelector = dictionaryFlags >> 6 & 1;
dictionary.aggregationInstancesSelector = dictionaryFlags >> 7 & 1;
dictionary.bitmapCodingContextUsed = !!(dictionaryFlags & 256);
dictionary.bitmapCodingContextRetained = !!(dictionaryFlags & 512);
dictionary.template = dictionaryFlags >> 10 & 3;
dictionary.refinementTemplate = dictionaryFlags >> 12 & 1;
position += 2;
if (!dictionary.huffman) {
atLength = dictionary.template === 0 ? 4 : 1;
at = [];
for (i = 0; i < atLength; i++) {
at.push({
x: readInt8(data, position),
y: readInt8(data, position + 1)
});
position += 2;
}
dictionary.at = at;
}
if (dictionary.refinement && !dictionary.refinementTemplate) {
at = [];
for (i = 0; i < 2; i++) {
at.push({
x: readInt8(data, position),
y: readInt8(data, position + 1)
});
position += 2;
}
dictionary.refinementAt = at;
}
dictionary.numberOfExportedSymbols = readUint32(data, position);
position += 4;
dictionary.numberOfNewSymbols = readUint32(data, position);
position += 4;
args = [ dictionary, header.number, header.referredTo, data, position, end ];
break;
case 6:
case 7:
var textRegion = {};
textRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var textRegionSegmentFlags = readUint16(data, position);
position += 2;
textRegion.huffman = !!(textRegionSegmentFlags & 1);
textRegion.refinement = !!(textRegionSegmentFlags & 2);
textRegion.stripSize = 1 << (textRegionSegmentFlags >> 2 & 3);
textRegion.referenceCorner = textRegionSegmentFlags >> 4 & 3;
textRegion.transposed = !!(textRegionSegmentFlags & 64);
textRegion.combinationOperator = textRegionSegmentFlags >> 7 & 3;
textRegion.defaultPixelValue = textRegionSegmentFlags >> 9 & 1;
textRegion.dsOffset = textRegionSegmentFlags << 17 >> 27;
textRegion.refinementTemplate = textRegionSegmentFlags >> 15 & 1;
if (textRegion.huffman) {
var textRegionHuffmanFlags = readUint16(data, position);
position += 2;
textRegion.huffmanFS = textRegionHuffmanFlags & 3;
textRegion.huffmanDS = textRegionHuffmanFlags >> 2 & 3;
textRegion.huffmanDT = textRegionHuffmanFlags >> 4 & 3;
textRegion.huffmanRefinementDW = textRegionHuffmanFlags >> 6 & 3;
textRegion.huffmanRefinementDH = textRegionHuffmanFlags >> 8 & 3;
textRegion.huffmanRefinementDX = textRegionHuffmanFlags >> 10 & 3;
textRegion.huffmanRefinementDY = textRegionHuffmanFlags >> 12 & 3;
textRegion.huffmanRefinementSizeSelector = !!(textRegionHuffmanFlags & 14);
}
if (textRegion.refinement && !textRegion.refinementTemplate) {
at = [];
for (i = 0; i < 2; i++) {
at.push({
x: readInt8(data, position),
y: readInt8(data, position + 1)
});
position += 2;
}
textRegion.refinementAt = at;
}
textRegion.numberOfSymbolInstances = readUint32(data, position);
position += 4;
if (textRegion.huffman) {
error("JBIG2 error: huffman is not supported");
}
args = [ textRegion, header.referredTo, data, position, end ];
break;
case 38:
case 39:
var genericRegion = {};
genericRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var genericRegionSegmentFlags = data[position++];
genericRegion.mmr = !!(genericRegionSegmentFlags & 1);
genericRegion.template = genericRegionSegmentFlags >> 1 & 3;
genericRegion.prediction = !!(genericRegionSegmentFlags & 8);
if (!genericRegion.mmr) {
atLength = genericRegion.template === 0 ? 4 : 1;
at = [];
for (i = 0; i < atLength; i++) {
at.push({
x: readInt8(data, position),
y: readInt8(data, position + 1)
});
position += 2;
}
genericRegion.at = at;
}
args = [ genericRegion, data, position, end ];
break;
case 48:
var pageInfo = {
width: readUint32(data, position),
height: readUint32(data, position + 4),
resolutionX: readUint32(data, position + 8),
resolutionY: readUint32(data, position + 12)
};
if (pageInfo.height === 4294967295) {
delete pageInfo.height;
}
var pageSegmentFlags = data[position + 16];
var pageStripingInformatiom = readUint16(data, position + 17);
pageInfo.lossless = !!(pageSegmentFlags & 1);
pageInfo.refinement = !!(pageSegmentFlags & 2);
pageInfo.defaultPixelValue = pageSegmentFlags >> 2 & 1;
pageInfo.combinationOperator = pageSegmentFlags >> 3 & 3;
pageInfo.requiresBuffer = !!(pageSegmentFlags & 32);
pageInfo.combinationOperatorOverride = !!(pageSegmentFlags & 64);
args = [ pageInfo ];
break;
case 49:
break;
case 50:
break;
case 51:
break;
case 62:
break;
default:
error("JBIG2 error: segment type " + header.typeName + "(" + header.type + ") is not implemented");
}
var callbackName = "on" + header.typeName;
if (callbackName in visitor) {
visitor[callbackName].apply(visitor, args);
}
}
function processSegments(segments, visitor) {
for (var i = 0, ii = segments.length; i < ii; i++) {
processSegment(segments[i], visitor);
}
}
function parseJbig2(data, start, end) {
var position = start;
if (data[position] !== 151 || data[position + 1] !== 74 || data[position + 2] !== 66 || data[position + 3] !== 50 || data[position + 4] !== 13 || data[position + 5] !== 10 || data[position + 6] !== 26 || data[position + 7] !== 10) {
error("JBIG2 error: invalid header");
}
var header = {};
position += 8;
var flags = data[position++];
header.randomAccess = !(flags & 1);
if (!(flags & 2)) {
header.numberOfPages = readUint32(data, position);
position += 4;
}
var segments = readSegments(header, data, position, end);
error("Not implemented");
}
function parseJbig2Chunks(chunks) {
var visitor = new SimpleSegmentVisitor();
for (var i = 0, ii = chunks.length; i < ii; i++) {
var chunk = chunks[i];
var segments = readSegments({}, chunk.data, chunk.start, chunk.end);
processSegments(segments, visitor);
}
return visitor;
}
function SimpleSegmentVisitor() {}
SimpleSegmentVisitor.prototype = {
onPageInformation: function SimpleSegmentVisitor_onPageInformation(info) {
this.currentPageInfo = info;
var rowSize = info.width + 7 >> 3;
var buffer = new Uint8Array(rowSize * info.height);
if (info.defaultPixelValue) {
for (var i = 0, ii = buffer.length; i < ii; i++) {
buffer[i] = 255;
}
}
this.buffer = buffer;
},
drawBitmap: function SimpleSegmentVisitor_drawBitmap(regionInfo, bitmap) {
var pageInfo = this.currentPageInfo;
var width = regionInfo.width, height = regionInfo.height;
var rowSize = pageInfo.width + 7 >> 3;
var combinationOperator = pageInfo.combinationOperatorOverride ? regionInfo.combinationOperator : pageInfo.combinationOperator;
var buffer = this.buffer;
var mask0 = 128 >> (regionInfo.x & 7);
var offset0 = regionInfo.y * rowSize + (regionInfo.x >> 3);
var i, j, mask, offset;
switch (combinationOperator) {
case 0:
for (i = 0; i < height; i++) {
mask = mask0;
offset = offset0;
for (j = 0; j < width; j++) {
if (bitmap[i][j]) {
buffer[offset] |= mask;
}
mask >>= 1;
if (!mask) {
mask = 128;
offset++;
}
}
offset0 += rowSize;
}
break;
case 2:
for (i = 0; i < height; i++) {
mask = mask0;
offset = offset0;
for (j = 0; j < width; j++) {
if (bitmap[i][j]) {
buffer[offset] ^= mask;
}
mask >>= 1;
if (!mask) {
mask = 128;
offset++;
}
}
offset0 += rowSize;
}
break;
default:
error("JBIG2 error: operator " + combinationOperator + " is not supported");
}
},
onImmediateGenericRegion: function SimpleSegmentVisitor_onImmediateGenericRegion(region, data, start, end) {
var regionInfo = region.info;
var decodingContext = new DecodingContext(data, start, end);
var bitmap = decodeBitmap(region.mmr, regionInfo.width, regionInfo.height, region.template, region.prediction, null, region.at, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessGenericRegion: function SimpleSegmentVisitor_onImmediateLosslessGenericRegion() {
this.onImmediateGenericRegion.apply(this, arguments);
},
onSymbolDictionary: function SimpleSegmentVisitor_onSymbolDictionary(dictionary, currentSegment, referredSegments, data, start, end) {
var huffmanTables;
if (dictionary.huffman) {
error("JBIG2 error: huffman is not supported");
}
var symbols = this.symbols;
if (!symbols) {
this.symbols = symbols = {};
}
var inputSymbols = [];
for (var i = 0, ii = referredSegments.length; i < ii; i++) {
inputSymbols = inputSymbols.concat(symbols[referredSegments[i]]);
}
var decodingContext = new DecodingContext(data, start, end);
symbols[currentSegment] = decodeSymbolDictionary(dictionary.huffman, dictionary.refinement, inputSymbols, dictionary.numberOfNewSymbols, dictionary.numberOfExportedSymbols, huffmanTables, dictionary.template, dictionary.at, dictionary.refinementTemplate, dictionary.refinementAt, decodingContext);
},
onImmediateTextRegion: function SimpleSegmentVisitor_onImmediateTextRegion(region, referredSegments, data, start, end) {
var regionInfo = region.info;
var huffmanTables;
var symbols = this.symbols;
var inputSymbols = [];
for (var i = 0, ii = referredSegments.length; i < ii; i++) {
inputSymbols = inputSymbols.concat(symbols[referredSegments[i]]);
}
var symbolCodeLength = log2(inputSymbols.length);
var decodingContext = new DecodingContext(data, start, end);
var bitmap = decodeTextRegion(region.huffman, region.refinement, regionInfo.width, regionInfo.height, region.defaultPixelValue, region.numberOfSymbolInstances, region.stripSize, inputSymbols, symbolCodeLength, region.transposed, region.dsOffset, region.referenceCorner, region.combinationOperator, huffmanTables, region.refinementTemplate, region.refinementAt, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessTextRegion: function SimpleSegmentVisitor_onImmediateLosslessTextRegion() {
this.onImmediateTextRegion.apply(this, arguments);
}
};
function Jbig2Image() {}
Jbig2Image.prototype = {
parseChunks: function Jbig2Image_parseChunks(chunks) {
return parseJbig2Chunks(chunks);
}
};
return Jbig2Image;
}();
function log2(x) {
var n = 1, i = 0;
while (x > n) {
n <<= 1;
i++;
}
return i;
}
function readInt8(data, start) {
return data[start] << 24 >> 24;
}
function readUint16(data, offset) {
return data[offset] << 8 | data[offset + 1];
}
function readUint32(data, offset) {
return (data[offset] << 24 | data[offset + 1] << 16 | data[offset + 2] << 8 | data[offset + 3]) >>> 0;
}
function shadow(obj, prop, value) {
Object.defineProperty(obj, prop, {
value: value,
enumerable: true,
configurable: true,
writable: false
});
return value;
}
var error = function() {
console.error.apply(console, arguments);
throw new Error("PDFJS error: " + arguments[0]);
};
var warn = function() {
console.warn.apply(console, arguments);
};
var info = function() {
console.info.apply(console, arguments);
};
Jbig2Image.prototype.parse = function parseJbig2(data) {
var position = 0, end = data.length;
if (data[position] !== 151 || data[position + 1] !== 74 || data[position + 2] !== 66 || data[position + 3] !== 50 || data[position + 4] !== 13 || data[position + 5] !== 10 || data[position + 6] !== 26 || data[position + 7] !== 10) {
error("JBIG2 error: invalid header");
}
var header = {};
position += 8;
var flags = data[position++];
header.randomAccess = !(flags & 1);
if (!(flags & 2)) {
header.numberOfPages = readUint32(data, position);
position += 4;
}
var visitor = this.parseChunks([ {
data: data,
start: position,
end: end
} ]);
var width = visitor.currentPageInfo.width;
var height = visitor.currentPageInfo.height;
var bitPacked = visitor.buffer;
var data = new Uint8Array(width * height);
var q = 0, k = 0;
for (var i = 0; i < height; i++) {
var mask = 0, buffer;
for (var j = 0; j < width; j++) {
if (!mask) {
mask = 128;
buffer = bitPacked[k++];
}
data[q++] = buffer & mask ? 0 : 255;
mask >>= 1;
}
}
this.width = width;
this.height = height;
this.data = data;
};
PDFJS.JpegImage = JpegImage;
PDFJS.JpxImage = JpxImage;
PDFJS.Jbig2Image = Jbig2Image;
})(PDFJS || (PDFJS = {}));
var JpegDecoder = PDFJS.JpegImage;
var JpxDecoder = PDFJS.JpxImage;
var Jbig2Decoder = PDFJS.Jbig2Image;
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