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jpegLossless.js
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jpegLossless.js
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(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jpeg = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*jslint browser: true, node: true */
/*global require, module */
"use strict";
/*** Imports ***/
var jpeg = jpeg || {};
jpeg.lossless = jpeg.lossless || {};
/*** Constructor ***/
jpeg.lossless.ComponentSpec = jpeg.lossless.ComponentSpec || function () {
this.hSamp = 0; // Horizontal sampling factor
this.quantTableSel = 0; // Quantization table destination selector
this.vSamp = 0; // Vertical
};
/*** Exports ***/
var moduleType = typeof module;
if ((moduleType !== 'undefined') && module.exports) {
module.exports = jpeg.lossless.ComponentSpec;
}
},{}],2:[function(require,module,exports){
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*jslint browser: true, node: true */
/*global require, module */
"use strict";
/*** Imports ***/
var jpeg = jpeg || {};
jpeg.lossless = jpeg.lossless || {};
/*** Constructor ***/
jpeg.lossless.DataStream = jpeg.lossless.DataStream || function (data, offset, length) {
// Note: DataView is much slower than Int8Array
// this.buffer = new DataView(data, offset, length);
this.buffer = new Uint8Array(data, offset, length);
this.index = 0;
};
jpeg.lossless.DataStream.prototype.get16 = function () {
// var value = this.buffer.getUint16(this.index, false);
var value = (this.buffer[this.index] << 8) + this.buffer[this.index + 1]; // DataView is big-endian by default
this.index += 2;
return value;
};
jpeg.lossless.DataStream.prototype.get8 = function () {
// var value = this.buffer.getUint8(this.index);
var value = this.buffer[this.index];
this.index += 1;
return value;
};
/*** Exports ***/
var moduleType = typeof module;
if ((moduleType !== 'undefined') && module.exports) {
module.exports = jpeg.lossless.DataStream;
}
},{}],3:[function(require,module,exports){
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*jslint browser: true, node: true */
/*global require, module */
"use strict";
/*** Imports ***/
var jpeg = jpeg || {};
jpeg.lossless = jpeg.lossless || {};
jpeg.lossless.DataStream = jpeg.lossless.DataStream || ((typeof require !== 'undefined') ? require('./data-stream.js') : null);
jpeg.lossless.HuffmanTable = jpeg.lossless.HuffmanTable || ((typeof require !== 'undefined') ? require('./huffman-table.js') : null);
jpeg.lossless.QuantizationTable = jpeg.lossless.QuantizationTable || ((typeof require !== 'undefined') ? require('./quantization-table.js') : null);
jpeg.lossless.ScanHeader = jpeg.lossless.ScanHeader || ((typeof require !== 'undefined') ? require('./scan-header.js') : null);
jpeg.lossless.FrameHeader = jpeg.lossless.FrameHeader || ((typeof require !== 'undefined') ? require('./frame-header.js') : null);
jpeg.lossless.Utils = jpeg.lossless.Utils || ((typeof require !== 'undefined') ? require('./utils.js') : null);
/*** Constructor ***/
/**
* The Decoder constructor.
* @property {number} xDim - size of x dimension
* @property {number} yDim - size of y dimension
* @property {number} numComp - number of components
* @property {number} numBytes - number of bytes per component
* @type {Function}
*/
jpeg.lossless.Decoder = jpeg.lossless.Decoder || function (buffer, numBytes) {
this.buffer = buffer;
this.frame = new jpeg.lossless.FrameHeader();
this.huffTable = new jpeg.lossless.HuffmanTable();
this.quantTable = new jpeg.lossless.QuantizationTable();
this.scan = new jpeg.lossless.ScanHeader();
this.DU = jpeg.lossless.Utils.createArray(10, 4, 64); // at most 10 data units in a MCU, at most 4 data units in one component
this.HuffTab = jpeg.lossless.Utils.createArray(4, 2, 50 * 256);
this.IDCT_Source = [];
this.nBlock = []; // number of blocks in the i-th Comp in a scan
this.acTab = jpeg.lossless.Utils.createArray(10, 1); // ac HuffTab for the i-th Comp in a scan
this.dcTab = jpeg.lossless.Utils.createArray(10, 1); // dc HuffTab for the i-th Comp in a scan
this.qTab = jpeg.lossless.Utils.createArray(10, 1); // quantization table for the i-th Comp in a scan
this.marker = 0;
this.markerIndex = 0;
this.numComp = 0;
this.restartInterval = 0;
this.selection = 0;
this.xDim = 0;
this.yDim = 0;
this.xLoc = 0;
this.yLoc = 0;
this.numBytes = 0;
this.outputData = null;
this.restarting = false;
this.mask = 0;
if (typeof numBytes !== "undefined") {
this.numBytes = numBytes;
}
};
/*** Static Pseudo-constants ***/
jpeg.lossless.Decoder.IDCT_P = [0, 5, 40, 16, 45, 2, 7, 42, 21, 56, 8, 61, 18, 47, 1, 4, 41, 23, 58, 13, 32, 24, 37, 10, 63, 17, 44, 3, 6, 43, 20,
57, 15, 34, 29, 48, 53, 26, 39, 9, 60, 19, 46, 22, 59, 12, 33, 31, 50, 55, 25, 36, 11, 62, 14, 35, 28, 49, 52, 27, 38, 30, 51, 54];
jpeg.lossless.Decoder.TABLE = [0, 1, 5, 6, 14, 15, 27, 28, 2, 4, 7, 13, 16, 26, 29, 42, 3, 8, 12, 17, 25, 30, 41, 43, 9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60, 21, 34, 37, 47, 50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63];
jpeg.lossless.Decoder.MAX_HUFFMAN_SUBTREE = 50;
jpeg.lossless.Decoder.MSB = 0x80000000;
jpeg.lossless.Decoder.RESTART_MARKER_BEGIN = 0xFFD0;
jpeg.lossless.Decoder.RESTART_MARKER_END = 0xFFD7;
/*** Prototype Methods ***/
/**
* Returns decompressed data.
* @param {ArrayBuffer} buffer
* @param {number} [offset]
* @param {number} [length]
* @returns {ArrayBufer}
*/
jpeg.lossless.Decoder.prototype.decompress = function (buffer, offset, length) {
return this.decode(buffer, offset, length).buffer;
};
jpeg.lossless.Decoder.prototype.decode = function (buffer, offset, length, numBytes) {
/*jslint bitwise: true */
var current, scanNum = 0, pred = [], i, compN, temp = [], index = [], mcuNum;
if (typeof buffer !== "undefined") {
this.buffer = buffer;
}
if (typeof numBytes !== "undefined") {
this.numBytes = numBytes;
}
this.stream = new jpeg.lossless.DataStream(this.buffer, offset, length);
this.buffer = null;
this.xLoc = 0;
this.yLoc = 0;
current = this.stream.get16();
if (current !== 0xFFD8) { // SOI
throw new Error("Not a JPEG file");
}
current = this.stream.get16();
while ((((current >> 4) !== 0x0FFC) || (current === 0xFFC4))) { // SOF 0~15
switch (current) {
case 0xFFC4: // DHT
this.huffTable.read(this.stream, this.HuffTab);
break;
case 0xFFCC: // DAC
throw new Error("Program doesn't support arithmetic coding. (format throw new IOException)");
case 0xFFDB:
this.quantTable.read(this.stream, jpeg.lossless.Decoder.TABLE);
break;
case 0xFFDD:
this.restartInterval = this.readNumber();
break;
case 0xFFE0:
case 0xFFE1:
case 0xFFE2:
case 0xFFE3:
case 0xFFE4:
case 0xFFE5:
case 0xFFE6:
case 0xFFE7:
case 0xFFE8:
case 0xFFE9:
case 0xFFEA:
case 0xFFEB:
case 0xFFEC:
case 0xFFED:
case 0xFFEE:
case 0xFFEF:
this.readApp();
break;
case 0xFFFE:
this.readComment();
break;
default:
if ((current >> 8) !== 0xFF) {
throw new Error("ERROR: format throw new IOException! (decode)");
}
}
current = this.stream.get16();
}
if ((current < 0xFFC0) || (current > 0xFFC7)) {
throw new Error("ERROR: could not handle arithmetic code!");
}
this.frame.read(this.stream);
current = this.stream.get16();
do {
while (current !== 0x0FFDA) { // SOS
switch (current) {
case 0xFFC4: // DHT
this.huffTable.read(this.stream, this.HuffTab);
break;
case 0xFFCC: // DAC
throw new Error("Program doesn't support arithmetic coding. (format throw new IOException)");
case 0xFFDB:
this.quantTable.read(this.stream, jpeg.lossless.Decoder.TABLE);
break;
case 0xFFDD:
this.restartInterval = this.readNumber();
break;
case 0xFFE0:
case 0xFFE1:
case 0xFFE2:
case 0xFFE3:
case 0xFFE4:
case 0xFFE5:
case 0xFFE6:
case 0xFFE7:
case 0xFFE8:
case 0xFFE9:
case 0xFFEA:
case 0xFFEB:
case 0xFFEC:
case 0xFFED:
case 0xFFEE:
case 0xFFEF:
this.readApp();
break;
case 0xFFFE:
this.readComment();
break;
default:
if ((current >> 8) !== 0xFF) {
throw new Error("ERROR: format throw new IOException! (Parser.decode)");
}
}
current = this.stream.get16();
}
this.precision = this.frame.precision;
this.components = this.frame.components;
if (!this.numBytes) {
this.numBytes = parseInt(Math.ceil(this.precision / 8));
}
if (this.numBytes == 1) {
this.mask = 0xFF;
} else {
this.mask = 0xFFFF;
}
this.scan.read(this.stream);
this.numComp = this.scan.numComp;
this.selection = this.scan.selection;
if (this.numBytes === 1) {
if (this.numComp === 3) {
this.getter = this.getValueRGB;
this.setter = this.setValueRGB;
this.output = this.outputRGB;
} else {
this.getter = this.getValue8;
this.setter = this.setValue8;
this.output = this.outputSingle;
}
} else {
this.getter = this.getValue16;
this.setter = this.setValue16;
this.output = this.outputSingle;
}
switch (this.selection) {
case 2:
this.selector = this.select2;
break;
case 3:
this.selector = this.select3;
break;
case 4:
this.selector = this.select4;
break;
case 5:
this.selector = this.select5;
break;
case 6:
this.selector = this.select6;
break;
case 7:
this.selector = this.select7;
break;
default:
this.selector = this.select1;
break;
}
this.scanComps = this.scan.components;
this.quantTables = this.quantTable.quantTables;
for (i = 0; i < this.numComp; i+=1) {
compN = this.scanComps[i].scanCompSel;
this.qTab[i] = this.quantTables[this.components[compN].quantTableSel];
this.nBlock[i] = this.components[compN].vSamp * this.components[compN].hSamp;
this.dcTab[i] = this.HuffTab[this.scanComps[i].dcTabSel][0];
this.acTab[i] = this.HuffTab[this.scanComps[i].acTabSel][1];
}
this.xDim = this.frame.dimX;
this.yDim = this.frame.dimY;
if (this.numBytes == 1) {
this.outputData = new Uint8Array(new ArrayBuffer(this.xDim * this.yDim * this.numBytes * this.numComp));
} else {
this.outputData = new Uint16Array(new ArrayBuffer(this.xDim * this.yDim * this.numBytes * this.numComp));
}
scanNum+=1;
while (true) { // Decode one scan
temp[0] = 0;
index[0] = 0;
for (i = 0; i < 10; i+=1) {
pred[i] = (1 << (this.precision - 1));
}
if (this.restartInterval === 0) {
current = this.decodeUnit(pred, temp, index);
while ((current === 0) && ((this.xLoc < this.xDim) && (this.yLoc < this.yDim))) {
this.output(pred);
current = this.decodeUnit(pred, temp, index);
}
break; //current=MARKER
}
for (mcuNum = 0; mcuNum < this.restartInterval; mcuNum+=1) {
this.restarting = (mcuNum == 0);
current = this.decodeUnit(pred, temp, index);
this.output(pred);
if (current !== 0) {
break;
}
}
if (current === 0) {
if (this.markerIndex !== 0) {
current = (0xFF00 | this.marker);
this.markerIndex = 0;
} else {
current = this.stream.get16();
}
}
if (!((current >= jpeg.lossless.Decoder.RESTART_MARKER_BEGIN) &&
(current <= jpeg.lossless.Decoder.RESTART_MARKER_END))) {
break; //current=MARKER
}
}
if ((current === 0xFFDC) && (scanNum === 1)) { //DNL
this.readNumber();
current = this.stream.get16();
}
} while ((current !== 0xFFD9) && ((this.xLoc < this.xDim) && (this.yLoc < this.yDim)) && (scanNum === 0));
return this.outputData;
};
jpeg.lossless.Decoder.prototype.decodeUnit = function (prev, temp, index) {
if (this.numComp == 1) {
return this.decodeSingle(prev, temp, index);
} else if (this.numComp == 3) {
return this.decodeRGB(prev, temp, index);
} else {
return -1;
}
};
jpeg.lossless.Decoder.prototype.select1 = function (compOffset) {
return this.getPreviousX(compOffset);
};
jpeg.lossless.Decoder.prototype.select2 = function (compOffset) {
return this.getPreviousY(compOffset);
};
jpeg.lossless.Decoder.prototype.select3 = function (compOffset) {
return this.getPreviousXY(compOffset);
};
jpeg.lossless.Decoder.prototype.select4 = function (compOffset) {
return (this.getPreviousX(compOffset) + this.getPreviousY(compOffset)) - this.getPreviousXY(compOffset);
};
jpeg.lossless.Decoder.prototype.select5 = function (compOffset) {
return this.getPreviousX(compOffset) + ((this.getPreviousY(compOffset) - this.getPreviousXY(compOffset)) >> 1);
};
jpeg.lossless.Decoder.prototype.select6 = function (compOffset) {
return this.getPreviousY(compOffset) + ((this.getPreviousX(compOffset) - this.getPreviousXY(compOffset)) >> 1);
};
jpeg.lossless.Decoder.prototype.select7 = function (compOffset) {
return ((this.getPreviousX(compOffset) + this.getPreviousY(compOffset)) / 2);
};
jpeg.lossless.Decoder.prototype.decodeRGB = function (prev, temp, index) {
/*jslint bitwise: true */
var value, actab, dctab, qtab, ctrC, i, k, j;
prev[0] = this.selector(0);
prev[1] = this.selector(1);
prev[2] = this.selector(2);
for (ctrC = 0; ctrC < this.numComp; ctrC+=1) {
qtab = this.qTab[ctrC];
actab = this.acTab[ctrC];
dctab = this.dcTab[ctrC];
for (i = 0; i < this.nBlock[ctrC]; i+=1) {
for (k = 0; k < this.IDCT_Source.length; k+=1) {
this.IDCT_Source[k] = 0;
}
value = this.getHuffmanValue(dctab, temp, index);
if (value >= 0xFF00) {
return value;
}
prev[ctrC] = this.IDCT_Source[0] = prev[ctrC] + this.getn(index, value, temp, index);
this.IDCT_Source[0] *= qtab[0];
for (j = 1; j < 64; j+=1) {
value = this.getHuffmanValue(actab, temp, index);
if (value >= 0xFF00) {
return value;
}
j += (value >> 4);
if ((value & 0x0F) === 0) {
if ((value >> 4) === 0) {
break;
}
} else {
this.IDCT_Source[jpeg.lossless.Decoder.IDCT_P[j]] = this.getn(index, value & 0x0F, temp, index) * qtab[j];
}
}
}
}
return 0;
};
jpeg.lossless.Decoder.prototype.decodeSingle = function (prev, temp, index) {
/*jslint bitwise: true */
var value, i, n, nRestart;
if (this.restarting) {
this.restarting = false;
prev[0] = (1 << (this.frame.precision - 1));
} else {
prev[0] = this.selector();
}
for (i = 0; i < this.nBlock[0]; i+=1) {
value = this.getHuffmanValue(this.dcTab[0], temp, index);
if (value >= 0xFF00) {
return value;
}
n = this.getn(prev, value, temp, index);
nRestart = (n >> 8);
if ((nRestart >= jpeg.lossless.Decoder.RESTART_MARKER_BEGIN) && (nRestart <= jpeg.lossless.Decoder.RESTART_MARKER_END)) {
return nRestart;
}
prev[0] += n;
}
return 0;
};
// Huffman table for fast search: (HuffTab) 8-bit Look up table 2-layer search architecture, 1st-layer represent 256 node (8 bits) if codeword-length > 8
// bits, then the entry of 1st-layer = (# of 2nd-layer table) | MSB and it is stored in the 2nd-layer Size of tables in each layer are 256.
// HuffTab[*][*][0-256] is always the only 1st-layer table.
//
// An entry can be: (1) (# of 2nd-layer table) | MSB , for code length > 8 in 1st-layer (2) (Code length) << 8 | HuffVal
//
// HuffmanValue(table HuffTab[x][y] (ex) HuffmanValue(HuffTab[1][0],...)
// ):
// return: Huffman Value of table
// 0xFF?? if it receives a MARKER
// Parameter: table HuffTab[x][y] (ex) HuffmanValue(HuffTab[1][0],...)
// temp temp storage for remainded bits
// index index to bit of temp
// in FILE pointer
// Effect:
// temp store new remainded bits
// index change to new index
// in change to new position
// NOTE:
// Initial by temp=0; index=0;
// NOTE: (explain temp and index)
// temp: is always in the form at calling time or returning time
// | byte 4 | byte 3 | byte 2 | byte 1 |
// | 0 | 0 | 00000000 | 00000??? | if not a MARKER
// ^index=3 (from 0 to 15)
// 321
// NOTE (marker and marker_index):
// If get a MARKER from 'in', marker=the low-byte of the MARKER
// and marker_index=9
// If marker_index=9 then index is always > 8, or HuffmanValue()
// will not be called
jpeg.lossless.Decoder.prototype.getHuffmanValue = function (table, temp, index) {
/*jslint bitwise: true */
var code, input, mask;
mask = 0xFFFF;
if (index[0] < 8) {
temp[0] <<= 8;
input = this.stream.get8();
if (input === 0xFF) {
this.marker = this.stream.get8();
if (this.marker !== 0) {
this.markerIndex = 9;
}
}
temp[0] |= input;
} else {
index[0] -= 8;
}
code = table[temp[0] >> index[0]];
if ((code & jpeg.lossless.Decoder.MSB) !== 0) {
if (this.markerIndex !== 0) {
this.markerIndex = 0;
return 0xFF00 | this.marker;
}
temp[0] &= (mask >> (16 - index[0]));
temp[0] <<= 8;
input = this.stream.get8();
if (input === 0xFF) {
this.marker = this.stream.get8();
if (this.marker !== 0) {
this.markerIndex = 9;
}
}
temp[0] |= input;
code = table[((code & 0xFF) * 256) + (temp[0] >> index[0])];
index[0] += 8;
}
index[0] += 8 - (code >> 8);
if (index[0] < 0) {
throw new Error("index=" + index[0] + " temp=" + temp[0] + " code=" + code + " in HuffmanValue()");
}
if (index[0] < this.markerIndex) {
this.markerIndex = 0;
return 0xFF00 | this.marker;
}
temp[0] &= (mask >> (16 - index[0]));
return code & 0xFF;
};
jpeg.lossless.Decoder.prototype.getn = function (PRED, n, temp, index) {
/*jslint bitwise: true */
var result, one, n_one, mask, input;
one = 1;
n_one = -1;
mask = 0xFFFF;
if (n === 0) {
return 0;
}
if (n === 16) {
if (PRED[0] >= 0) {
return -32768;
} else {
return 32768;
}
}
index[0] -= n;
if (index[0] >= 0) {
if ((index[0] < this.markerIndex) && !this.isLastPixel()) { // this was corrupting the last pixel in some cases
this.markerIndex = 0;
return (0xFF00 | this.marker) << 8;
}
result = temp[0] >> index[0];
temp[0] &= (mask >> (16 - index[0]));
} else {
temp[0] <<= 8;
input = this.stream.get8();
if (input === 0xFF) {
this.marker = this.stream.get8();
if (this.marker !== 0) {
this.markerIndex = 9;
}
}
temp[0] |= input;
index[0] += 8;
if (index[0] < 0) {
if (this.markerIndex !== 0) {
this.markerIndex = 0;
return (0xFF00 | this.marker) << 8;
}
temp[0] <<= 8;
input = this.stream.get8();
if (input === 0xFF) {
this.marker = this.stream.get8();
if (this.marker !== 0) {
this.markerIndex = 9;
}
}
temp[0] |= input;
index[0] += 8;
}
if (index[0] < 0) {
throw new Error("index=" + index[0] + " in getn()");
}
if (index[0] < this.markerIndex) {
this.markerIndex = 0;
return (0xFF00 | this.marker) << 8;
}
result = temp[0] >> index[0];
temp[0] &= (mask >> (16 - index[0]));
}
if (result < (one << (n - 1))) {
result += (n_one << n) + 1;
}
return result;
};
jpeg.lossless.Decoder.prototype.getPreviousX = function (compOffset) {
/*jslint bitwise: true */
if (this.xLoc > 0) {
return this.getter((((this.yLoc * this.xDim) + this.xLoc) - 1), compOffset);
} else if (this.yLoc > 0) {
return this.getPreviousY(compOffset);
} else {
return (1 << (this.frame.precision - 1));
}
};
jpeg.lossless.Decoder.prototype.getPreviousXY = function (compOffset) {
/*jslint bitwise: true */
if ((this.xLoc > 0) && (this.yLoc > 0)) {
return this.getter(((((this.yLoc - 1) * this.xDim) + this.xLoc) - 1), compOffset);
} else {
return this.getPreviousY(compOffset);
}
};
jpeg.lossless.Decoder.prototype.getPreviousY = function (compOffset) {
/*jslint bitwise: true */
if (this.yLoc > 0) {
return this.getter((((this.yLoc - 1) * this.xDim) + this.xLoc), compOffset);
} else {
return this.getPreviousX(compOffset);
}
};
jpeg.lossless.Decoder.prototype.isLastPixel = function () {
return (this.xLoc === (this.xDim - 1)) && (this.yLoc === (this.yDim - 1));
};
jpeg.lossless.Decoder.prototype.outputSingle = function (PRED) {
if ((this.xLoc < this.xDim) && (this.yLoc < this.yDim)) {
this.setter((((this.yLoc * this.xDim) + this.xLoc)), this.mask & PRED[0]);
this.xLoc+=1;
if (this.xLoc >= this.xDim) {
this.yLoc+=1;
this.xLoc = 0;
}
}
};
jpeg.lossless.Decoder.prototype.outputRGB = function (PRED) {
var offset = ((this.yLoc * this.xDim) + this.xLoc);
if ((this.xLoc < this.xDim) && (this.yLoc < this.yDim)) {
this.setter(offset, PRED[0], 0);
this.setter(offset, PRED[1], 1);
this.setter(offset, PRED[2], 2);
this.xLoc+=1;
if (this.xLoc >= this.xDim) {
this.yLoc+=1;
this.xLoc = 0;
}
}
};
jpeg.lossless.Decoder.prototype.setValue8 = function (index, val) {
this.outputData[index] = val;
};
jpeg.lossless.Decoder.prototype.getValue8 = function (index) {
return this.outputData[index]; // mask should not be necessary because outputData is either Int8Array or Int16Array
};
var littleEndian = (function() {
var buffer = new ArrayBuffer(2);
new DataView(buffer).setInt16(0, 256, true /* littleEndian */);
// Int16Array uses the platform's endianness.
return new Int16Array(buffer)[0] === 256;
})();
if (littleEndian) {
// just reading from an array is fine then. Int16Array will use platform endianness.
jpeg.lossless.Decoder.prototype.setValue16 = jpeg.lossless.Decoder.prototype.setValue8;
jpeg.lossless.Decoder.prototype.getValue16 = jpeg.lossless.Decoder.prototype.getValue8;
}
else {
// If platform is big-endian, we will need to convert to little-endian
jpeg.lossless.Decoder.prototype.setValue16 = function (index, val) {
this.outputData[index] = ((val & 0xFF) << 8) | ((val >> 8) & 0xFF);
};
jpeg.lossless.Decoder.prototype.getValue16 = function (index) {
var val = this.outputData[index];
return ((val & 0xFF) << 8) | ((val >> 8) & 0xFF);
};
}
jpeg.lossless.Decoder.prototype.setValueRGB = function (index, val, compOffset) {
// this.outputData.setUint8(index * 3 + compOffset, val);
this.outputData[index * 3 + compOffset] = val;
};
jpeg.lossless.Decoder.prototype.getValueRGB = function (index, compOffset) {
// return this.outputData.getUint8(index * 3 + compOffset);
return this.outputData[index * 3 + compOffset];
};
jpeg.lossless.Decoder.prototype.readApp = function() {
var count = 0, length = this.stream.get16();
count += 2;
while (count < length) {
this.stream.get8();
count+=1;
}
return length;
};
jpeg.lossless.Decoder.prototype.readComment = function () {
var sb = "", count = 0, length;
length = this.stream.get16();
count += 2;
while (count < length) {
sb += this.stream.get8();
count+=1;
}
return sb;
};
jpeg.lossless.Decoder.prototype.readNumber = function() {
var Ld = this.stream.get16();
if (Ld !== 4) {
throw new Error("ERROR: Define number format throw new IOException [Ld!=4]");
}
return this.stream.get16();
};
/*** Exports ***/
var moduleType = typeof module;
if ((moduleType !== 'undefined') && module.exports) {
module.exports = jpeg.lossless.Decoder;
}
},{"./data-stream.js":2,"./frame-header.js":4,"./huffman-table.js":5,"./quantization-table.js":7,"./scan-header.js":9,"./utils.js":10}],4:[function(require,module,exports){
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal