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QRCode-decode
mirror of https://github.com/cnwhy/QRCode-decode.git
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add image decode

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master
cnwhy 7 years ago
parent e7ea6ce581
commit 64acd199eb
23 changed files with 6272 additions and 5 deletions
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5
package.json
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@ -23,5 +23,10 @@
"homepage": "https://github.com/cnwhy/QRCode-decode#readme", "homepage": "https://github.com/cnwhy/QRCode-decode#readme",
"devDependencies": { "devDependencies": {
"parcel": "^1.9.7" "parcel": "^1.9.7"
},
"dependencies": {
"bmp-js": "^0.1.0",
"image-type": "^3.0.0",
"pako": "^1.0.6"
} }
} }

85
server.js
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var fs = require('fs')
var imgDecode = require('./src/imageDecode')
var imgType = require('image-type')
var qrDecode = require('./')
// var jpg = require('./src/imageDecode/jpg');
function decode(buffer) {
var type;
return new Promise(function (res, rej) {
type = (imgType(buffer) || {}).ext;
switch (type) {
case 'bmp':
res(imgDecode.bmp(buffer));
break;
case 'jpg':
res(imgDecode.jpg(buffer));
break;
case 'png':
res(imgDecode.png(buffer));
break;
case 'gif':
// var t1 = Date.now();
res(imgDecode.gif1(buffer));
// console.log('gif: ',Date.now() - t1);
break;
default:
if (type) {
throw 'Support for this type! type as ' + type
}
throw 'not image!'
}
}).then(function (imageData) {
if (type == 'gif') {
return new Promise(function (res, rej) {
var errList = [];
var images = imageData;
var onerr = function (e) {
errList.push(e);
if (errList.length < images.length) return;
rej('解码失败!')
}
// console.log('length',imageData.length)
if (imageData.length <= 0) {
rej('解码失败!')
} else if (imageData.length > 3) {
images = [];
var l = 1;
var i = 0;
while ( Math.pow(2,++l) < imageData.length){
}
// console.log('l:',l)
var sp = (imageData.length-1)/l;
// console.log('sp:',sp)
do{
// console.log(Math.floor(i*sp));
images.push(imageData[Math.floor(i*sp)])
}while(i++<l)
}
// console.log(images.length)
images.forEach(function (v) {
setTimeout(function () {
try {
res(qrDecode(v));
} catch (e) {
console.log(e);
onerr(e)
}
}, 0)
})
})
}
return qrDecode(imageData);
})
}
exports.decodeQRFile = function (path) {
return new Promise(function (res, rej) {
fs.readFile(path, function (err, buffer) {
if (err) { return rej(err) }
res(decode(buffer));
})
})
}
exports.decode = decode;

9
src/QRCodeDecode.js
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@ -116,7 +116,7 @@ function decode(imageDate,debugfn){
} }
var process = function (data,base) { var process = function (data,base) {
var start = new Date().getTime(); // var start = new Date().getTime();
// var image = grayScaleToBitmap(grayscale(),base); // var image = grayScaleToBitmap(grayscale(),base);
// var image = binarize(128); // var image = binarize(128);
var image = binarize(data,base,153); //转为位图; var image = binarize(data,base,153); //转为位图;
@ -146,10 +146,9 @@ var process = function (data,base) {
str += String.fromCharCode(data[i][j]); str += String.fromCharCode(data[i][j]);
} }
var end = new Date().getTime(); // var end = new Date().getTime();
var time = end - start; // var time = end - start;
// console.log("Time:" + time + " Code: "+str);
console.log("Time:" + time + " Code: "+str);
return str; return str;
} }

17
src/imageDecode/bmp.js
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var BmpDecode = require('bmp-js/lib/decoder');
module.exports = function(buff){
var bmp = BmpDecode(buff);
var abgr = bmp.data;
var data = [];
var max = abgr.length/4;
for(var i = 0; i<max; i++){
var s = i*4;
data.push(abgr[s+3],abgr[s+2],abgr[s+1],255)
}
return {
width: bmp.width,
height: bmp.height,
data : data
}
}

525
src/imageDecode/gif.1.js
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//https://github.com/shachaf/jsgif
// Generic functions
var bitsToNum = function (ba) {
return ba.reduce(function (s, n) { return s * 2 + n; }, 0);
};
var byteToBitArr = function (bite) {
var a = [];
for (var i = 7; i >= 0; i--) {
a.push(!!(bite & (1 << i)));
}
return a;
};
// Stream
/**
* @constructor
*/ // Make compiler happy.
var Stream = function (data) {
this.data = data;
var len = this.data.length;
var pos = 0;
this.readByte = function () {
if (pos >= len) {
throw new Error('Attempted to read past end of stream.');
}
// return data.charCodeAt(pos++) & 0xFF;
// var bit = data[pos++];
// return String.fromCharCode(bit).charCodeAt(0) & 0xff;
return data[pos++];
};
this.readBytes = function (n) {
var bytes = [];
for (var i = 0; i < n; i++) {
bytes.push(this.readByte());
}
return bytes;
// var start = pos
// pos += n;
// if(start>= len || pos > len){
// throw new Error('Attempted to read past end of stream.');
// }
// return [].slice.call(data,start,pos)
};
this.read = function (n) {
var s = '';
for (var i = 0; i < n; i++) {
s += String.fromCharCode(this.readByte());
}
return s;
};
this.readUnsigned = function () { // Little-endian.
var a = this.readBytes(2);
return (a[1] << 8) + a[0];
};
};
var lzwDecode = function (minCodeSize, data, gct,GCE) {
// TODO: Now that the GIF parser is a bit different, maybe this should get an array of bytes instead of a String?
var pos = 0; // Maybe this streaming thing should be merged with the Stream?
var readCode = function (size) {
var code = 0;
for (var i = 0; i < size; i++) {
if (data[pos >> 3] & (1 << (pos & 7))) {
code |= 1 << i;
}
pos++;
}
return code;
};
var output = [];
var imageData = [];
var clearCode = 1 << minCodeSize;
var eoiCode = clearCode + 1;
var codeSize = minCodeSize + 1;
var dict = [];
var clear = function () {
dict = [];
codeSize = minCodeSize + 1;
for (var i = 0; i < clearCode; i++) {
dict[i] = [i];
}
dict[clearCode] = [];
dict[eoiCode] = null;
};
var code;
var last;
while (true) {
last = code;
code = readCode(codeSize);
if (code === clearCode) {
clear();
continue;
}
if (code === eoiCode) break;
if (code < dict.length) {
if (last !== clearCode) {
dict.push(dict[last].concat(dict[code][0]));
}
} else {
if (code !== dict.length) throw new Error('Invalid LZW code.');
// try{
dict.push(dict[last].concat(dict[last][0]));
// }catch(e){
// console.log(minCodeSize,data);
// console.log(dict,last);
// throw e
// }
}
var inItem = dict[code];
// output.push.apply(output, inItem);
inItem.forEach(function(v){
// output.push(v);
var rgb = gct[v]
imageData.push(rgb[0],rgb[1],rgb[2],GCE.transparencyIndex == v ? 0 : 255)
})
// imageData.push.apply(imageData, inItem.map(function(v){
// var c = gct[v];
// var rgba = [c[0],c[1],c[2],GCE.transparencyIndex == v ? 0 : 255]
// //rgba.push(GCE.transparencyIndex == v ? 0 : 255)
// // return color;
// return rgba;
// // return color.slice(0).push(GCE.transparencyIndex == v ? 0 : 255)
// }))
if (dict.length === (1 << codeSize) && codeSize < 12) {
// If we're at the last code and codeSize is 12, the next code will be a clearCode, and it'll be 12 bits long.
codeSize++;
}
}
// I don't know if this is technically an error, but some GIFs do it.
//if (Math.ceil(pos / 8) !== data.length) throw new Error('Extraneous LZW bytes.');
return [output,imageData];
};
// The actual parsing; returns an object with properties.
var parseGIF = function (st, handler) {
handler || (handler = {});
var GCE,gct;
// LZW (GIF-specific)
var parseCT = function (entries) { // Each entry is 3 bytes, for RGB.
var ct = [];
for (var i = 0; i < entries; i++) {
ct.push(st.readBytes(3));
}
return ct;
};
var readSubBlocks = function () {
var size, data;
data = '';
do {
size = st.readByte();
data += st.read(size);
} while (size !== 0);
return data;
};
var readByteBlocks = function(){
var size, data;
data = [];
do {
size = st.readByte();
data.push.apply(data,st.readBytes(size))
// data = data.concat(st.readBytes(size));
} while (size !== 0);
return data;
}
var parseHeader = function () {
var hdr = {};
hdr.sig = st.read(3);
hdr.ver = st.read(3);
if (hdr.sig !== 'GIF') throw new Error('Not a GIF file.'); // XXX: This should probably be handled more nicely.
hdr.width = st.readUnsigned();
hdr.height = st.readUnsigned();
var bits = byteToBitArr(st.readByte());
hdr.gctFlag = bits.shift();
hdr.colorRes = bitsToNum(bits.splice(0, 3));
hdr.sorted = bits.shift();
hdr.gctSize = bitsToNum(bits.splice(0, 3));
hdr.bgColor = st.readByte();
hdr.pixelAspectRatio = st.readByte(); // if not 0, aspectRatio = (pixelAspectRatio + 15) / 64
if (hdr.gctFlag) {
gct = hdr.gct = parseCT(1 << (hdr.gctSize + 1));
}
handler.hdr && handler.hdr(hdr);
};
var parseExt = function (block) {
var parseGCExt = function (block) {
var blockSize = st.readByte(); // Always 4
var bits = byteToBitArr(st.readByte());
block.reserved = bits.splice(0, 3); // Reserved; should be 000.
block.disposalMethod = bitsToNum(bits.splice(0, 3));
block.userInput = bits.shift();
block.transparencyGiven = bits.shift();
block.delayTime = st.readUnsigned();
block.transparencyIndex = st.readByte();
block.terminator = st.readByte();
GCE = block;
handler.gce && handler.gce(block);
};
var parseComExt = function (block) {
block.comment = readSubBlocks();
handler.com && handler.com(block);
};
var parsePTExt = function (block) {
// No one *ever* uses this. If you use it, deal with parsing it yourself.
var blockSize = st.readByte(); // Always 12
block.ptHeader = st.readBytes(12);
block.ptData = readSubBlocks();
handler.pte && handler.pte(block);
};
var parseAppExt = function (block) {
var parseNetscapeExt = function (block) {
var blockSize = st.readByte(); // Always 3
block.unknown = st.readByte(); // ??? Always 1? What is this?
block.iterations = st.readUnsigned();
block.terminator = st.readByte();
handler.app && handler.app.NETSCAPE && handler.app.NETSCAPE(block);
};
var parseUnknownAppExt = function (block) {
block.appData = readSubBlocks();
// FIXME: This won't work if a handler wants to match on any identifier.
handler.app && handler.app[block.identifier] && handler.app[block.identifier](block);
};
var blockSize = st.readByte(); // Always 11
block.identifier = st.read(8);
block.authCode = st.read(3);
switch (block.identifier) {
case 'NETSCAPE':
parseNetscapeExt(block);
break;
default:
parseUnknownAppExt(block);
break;
}
};
var parseUnknownExt = function (block) {
block.data = readSubBlocks();
handler.unknown && handler.unknown(block);
};
block.label = st.readByte();
switch (block.label) {
case 0xF9:
block.extType = 'gce';
parseGCExt(block);
break;
case 0xFE:
block.extType = 'com';
parseComExt(block);
break;
case 0x01:
block.extType = 'pte';
parsePTExt(block);
break;
case 0xFF:
block.extType = 'app';
parseAppExt(block);
break;
default:
block.extType = 'unknown';
parseUnknownExt(block);
break;
}
};
var parseImg = function (img) {
var deinterlace = function (pixels, width) {
// Of course this defeats the purpose of interlacing. And it's *probably*
// the least efficient way it's ever been implemented. But nevertheless...
var newPixels = new Array(pixels.length);
var rows = pixels.length / width;
var cpRow = function (toRow, fromRow) {
var fromPixels = pixels.slice(fromRow * width, (fromRow + 1) * width);
newPixels.splice.apply(newPixels, [toRow * width, width].concat(fromPixels));
};
// See appendix E.
var offsets = [0, 4, 2, 1];
var steps = [8, 8, 4, 2];
var fromRow = 0;
for (var pass = 0; pass < 4; pass++) {
for (var toRow = offsets[pass]; toRow < rows; toRow += steps[pass]) {
cpRow(toRow, fromRow)
fromRow++;
}
}
return newPixels;
};
img.leftPos = st.readUnsigned();
img.topPos = st.readUnsigned();
img.width = st.readUnsigned();
img.height = st.readUnsigned();
var bits = byteToBitArr(st.readByte());
img.lctFlag = bits.shift();
img.interlaced = bits.shift();
img.sorted = bits.shift();
img.reserved = bits.splice(0, 2);
img.lctSize = bitsToNum(bits.splice(0, 3));
if (img.lctFlag) {
img.lct = parseCT(1 << (img.lctSize + 1));
}
img.lzwMinCodeSize = st.readByte();
// var lzwData = readSubBlocks();
var lzwData = readByteBlocks();
var lzwd = lzwDecode(img.lzwMinCodeSize, lzwData, gct,GCE);
img.pixels = lzwd[0];
img.data = lzwd[1];
// console.log(img.imageData)
if (img.interlaced) { // Move
console.log(img.pixels)
img.pixels = deinterlace(img.pixels, img.width);
console.log(img.pixels)
}
handler.img && handler.img(img);
};
var parseBlock = function () {
var block = {};
block.sentinel = st.readByte();
switch (String.fromCharCode(block.sentinel)) { // For ease of matching
case '!':
block.type = 'ext';
parseExt(block);
break;
case ',':
block.type = 'img';
parseImg(block);
break;
case ';':
block.type = 'eof';
handler.eof && handler.eof(block);
break;
default:
throw new Error('Unknown block: 0x' + block.sentinel.toString(16)); // TODO: Pad this with a 0.
}
// if (block.type !== 'eof') setTimeout(parseBlock,0);
if (block.type !== 'eof') parseBlock();
};
var parse = function () {
parseHeader();
parseBlock();
// setTimeout(parseBlock, 0);
};
parse();
};
// BEGIN_NON_BOOKMARKLET_CODE
exports.Stream = Stream;
exports.parseGIF = parseGIF;
exports.decode = function (buffer) {
var gifData = { images: [] };
var gct;
var GCE;
var log = console.log;
// var showBool = function (b) {
// return b ? 'yes' : 'no';
// };
// var showColor = function (rgb) {
// // FIXME When I have an Internet connection.
// var showHex = function (n) { // Two-digit code.
// var hexChars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
// return hexChars[(n >>> 4) & 0xF] + hexChars[n & 0xF];
// };
// return '#' + showHex(rgb[0]) + showHex(rgb[1]) + showHex(rgb[2]);
// };
// var showDisposalMethod = function (dm) {
// var map = {
// 0: 'None',
// 1: 'Do not dispose',
// 2: 'Restore to background',
// 3: 'Restore to previous'
// };
// return map[dm] || 'Unknown';
// }
//尺寸 背景色 调色板 等
var doHdr = function (hdr) {
// log('Header:');
// log(' Version: %s', hdr.ver);
// log(' Size: %dx%d', hdr.width, hdr.height);
// log(' GCT? %s%s', showBool(hdr.gctFlag), hdr.gctFlag ? ' (' + hdr.gct.length + ' entries)' : '');
// log(' Color resolution: %d', hdr.colorRes);
// log(' Sorted? %s', showBool(hdr.sorted));
// log(' Background color: %s (%d)', hdr.gctFlag ? showColor(hdr.bgColor) : 'no GCT', hdr.bgColor);
// log(' Pixel aspect ratio: %d FIXME', hdr.pixelAspectRatio);
gct = hdr.gct;
gifData.width = hdr.width;
gifData.height = hdr.height;
};
//当前帧的非颜色信息 (透明色,延时 等))
var doGCE = function (gce) {
// log('GCE:');
// log(' Disposal method: %d (%s)', gce.disposalMethod, showDisposalMethod(gce.disposalMethod));
// log(' User input expected? %s', showBool(gce.userInput));
// log(' Transparency given? %s%s', showBool(gce.transparencyGiven),
// gce.transparencyGiven ? ' (index: ' + gce.transparencyIndex + ')' : '');
// log(' Delay time: %d', gce.delayTime);
GCE = gce;
};
//当前帧的图片图像信息
// var doimgTime = 0;
var doImg = function (img) {
// log('Image descriptor:');
// log(Object.assign({},img,{'pixels':Math.max.apply(Math,img.pixels)}));
// log(' Geometry: %dx%d+%d+%d', img.width, img.height, img.leftPos, img.topPos);
// log(' LCT? %s%s', showBool(img.lctFlag), img.lctFlag ? ' (' + img.lct.length + ' entries)' : '');
// log(' Interlaced? %s', showBool(img.interlaced));
// log(' %d pixels', img.pixels.length);
// var t1 = Date.now();
// var data = [];
// console.log(data.length , img.width * img.height)
var imageData = {
left: img.leftPos,
top: img.topPos,
width: img.width,
height: img.height,
// data: data,
data: img.data,
}
// img.pixels.forEach(function (v) {
// var color = gct[v];
// data.push.apply(data, color.concat(GCE.transparencyIndex == v ? 0 : 255));
// })
// console.log(data.length)
// console.log(img.imageData.length)
gifData.images.push(imageData);
// doimgTime += Date.now() - t1;
};
var doNetscape = function (block) {
// log('Netscape application extension:');
// log(' Iterations: %d%s', block.iterations, block.iterations === 0 ? ' (infinite)' : '');
};
var doCom = function (com) {
// log('Comment extension:');
// log(' Comment: %s', com.comment);
};
var doEOF = function (eof) {
// log('EOF:');
// log(eof);
};
var doUnknownApp = function (block) {
// log(block)
};
var doUnknownExt = function (block) {
// log(block)
}
var handler = {
hdr: doHdr,
img: doImg,
gce: doGCE,
com: doCom,
app: {
NETSCAPE: doNetscape,
unknown: doUnknownApp
},
eof: doEOF
};
var st = new Stream(buffer);
parseGIF(st, handler);
// console.log('doimgTime:',doimgTime)
return gifData;
}

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src/imageDecode/gif.js
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//https://github.com/shachaf/jsgif
// Generic functions
var bitsToNum = function (ba) {
return ba.reduce(function (s, n) { return s * 2 + n; }, 0);
};
var byteToBitArr = function (bite) {
var a = [];
for (var i = 7; i >= 0; i--) {
a.push(!!(bite & (1 << i)));
}
return a;
};
// Stream
/**
* @constructor
*/ // Make compiler happy.
var Stream = function (data) {
this.data = data;
this.len = this.data.length;
this.pos = 0;
this.readByte = function () {
if (this.pos >= this.data.length) {
throw new Error('Attempted to read past end of stream.');
}
return data.charCodeAt(this.pos++) & 0xFF;
};
this.readBytes = function (n) {
var bytes = [];
for (var i = 0; i < n; i++) {
bytes.push(this.readByte());
}
return bytes;
};
this.read = function (n) {
var s = '';
for (var i = 0; i < n; i++) {
s += String.fromCharCode(this.readByte());
}
return s;
};
this.readUnsigned = function () { // Little-endian.
var a = this.readBytes(2);
return (a[1] << 8) + a[0];
};
};
var lzwDecode = function (minCodeSize, data) {
// TODO: Now that the GIF parser is a bit different, maybe this should get an array of bytes instead of a String?
var pos = 0; // Maybe this streaming thing should be merged with the Stream?
var readCode = function (size) {
var code = 0;
for (var i = 0; i < size; i++) {
if (data.charCodeAt(pos >> 3) & (1 << (pos & 7))) {
code |= 1 << i;
}
pos++;
}
return code;
};
var output = [];
var clearCode = 1 << minCodeSize;
var eoiCode = clearCode + 1;
var codeSize = minCodeSize + 1;
var dict = [];
var clear = function () {
dict = [];
codeSize = minCodeSize + 1;
for (var i = 0; i < clearCode; i++) {
dict[i] = [i];
}
dict[clearCode] = [];
dict[eoiCode] = null;
};
var code;
var last;
while (true) {
last = code;
code = readCode(codeSize);
if (code === clearCode) {
clear();
continue;
}
if (code === eoiCode) break;
if (code < dict.length) {
if (last !== clearCode) {
dict.push(dict[last].concat(dict[code][0]));
}
} else {
if (code !== dict.length) throw new Error('Invalid LZW code.');
dict.push(dict[last].concat(dict[last][0]));
}
output.push.apply(output, dict[code]);
if (dict.length === (1 << codeSize) && codeSize < 12) {
// If we're at the last code and codeSize is 12, the next code will be a clearCode, and it'll be 12 bits long.
codeSize++;
}
}
// I don't know if this is technically an error, but some GIFs do it.
//if (Math.ceil(pos / 8) !== data.length) throw new Error('Extraneous LZW bytes.');
return output;
};
// The actual parsing; returns an object with properties.
var parseGIF = function (st, handler) {
handler || (handler = {});
// LZW (GIF-specific)
var parseCT = function (entries) { // Each entry is 3 bytes, for RGB.
var ct = [];
for (var i = 0; i < entries; i++) {
ct.push(st.readBytes(3));
}
return ct;
};
var readSubBlocks = function () {
var size, data;
data = '';
do {
size = st.readByte();
data += st.read(size);
} while (size !== 0);
return data;
};
var parseHeader = function () {
var hdr = {};
hdr.sig = st.read(3);
hdr.ver = st.read(3);
if (hdr.sig !== 'GIF') throw new Error('Not a GIF file.'); // XXX: This should probably be handled more nicely.
hdr.width = st.readUnsigned();
hdr.height = st.readUnsigned();
var bits = byteToBitArr(st.readByte());
hdr.gctFlag = bits.shift();
hdr.colorRes = bitsToNum(bits.splice(0, 3));
hdr.sorted = bits.shift();
hdr.gctSize = bitsToNum(bits.splice(0, 3));
hdr.bgColor = st.readByte();
hdr.pixelAspectRatio = st.readByte(); // if not 0, aspectRatio = (pixelAspectRatio + 15) / 64
if (hdr.gctFlag) {
hdr.gct = parseCT(1 << (hdr.gctSize + 1));
}
handler.hdr && handler.hdr(hdr);
};
var parseExt = function (block) {
var parseGCExt = function (block) {
var blockSize = st.readByte(); // Always 4
var bits = byteToBitArr(st.readByte());
block.reserved = bits.splice(0, 3); // Reserved; should be 000.
block.disposalMethod = bitsToNum(bits.splice(0, 3));
block.userInput = bits.shift();
block.transparencyGiven = bits.shift();
block.delayTime = st.readUnsigned();
block.transparencyIndex = st.readByte();
block.terminator = st.readByte();
handler.gce && handler.gce(block);
};
var parseComExt = function (block) {
block.comment = readSubBlocks();
handler.com && handler.com(block);
};
var parsePTExt = function (block) {
// No one *ever* uses this. If you use it, deal with parsing it yourself.
var blockSize = st.readByte(); // Always 12
block.ptHeader = st.readBytes(12);
block.ptData = readSubBlocks();
handler.pte && handler.pte(block);
};
var parseAppExt = function (block) {
var parseNetscapeExt = function (block) {
var blockSize = st.readByte(); // Always 3
block.unknown = st.readByte(); // ??? Always 1? What is this?
block.iterations = st.readUnsigned();
block.terminator = st.readByte();
handler.app && handler.app.NETSCAPE && handler.app.NETSCAPE(block);
};
var parseUnknownAppExt = function (block) {
block.appData = readSubBlocks();
// FIXME: This won't work if a handler wants to match on any identifier.
handler.app && handler.app[block.identifier] && handler.app[block.identifier](block);
};
var blockSize = st.readByte(); // Always 11
block.identifier = st.read(8);
block.authCode = st.read(3);
switch (block.identifier) {
case 'NETSCAPE':
parseNetscapeExt(block);
break;
default:
parseUnknownAppExt(block);
break;
}
};
var parseUnknownExt = function (block) {
block.data = readSubBlocks();
handler.unknown && handler.unknown(block);
};
block.label = st.readByte();
switch (block.label) {
case 0xF9:
block.extType = 'gce';
parseGCExt(block);
break;
case 0xFE:
block.extType = 'com';
parseComExt(block);
break;
case 0x01:
block.extType = 'pte';
parsePTExt(block);
break;
case 0xFF:
block.extType = 'app';
parseAppExt(block);
break;
default:
block.extType = 'unknown';
parseUnknownExt(block);
break;
}
};
var parseImg = function (img) {
var deinterlace = function (pixels, width) {
// Of course this defeats the purpose of interlacing. And it's *probably*
// the least efficient way it's ever been implemented. But nevertheless...
var newPixels = new Array(pixels.length);
var rows = pixels.length / width;
var cpRow = function (toRow, fromRow) {
var fromPixels = pixels.slice(fromRow * width, (fromRow + 1) * width);
newPixels.splice.apply(newPixels, [toRow * width, width].concat(fromPixels));
};
// See appendix E.
var offsets = [0, 4, 2, 1];
var steps = [8, 8, 4, 2];
var fromRow = 0;
for (var pass = 0; pass < 4; pass++) {
for (var toRow = offsets[pass]; toRow < rows; toRow += steps[pass]) {
cpRow(toRow, fromRow)
fromRow++;
}
}
return newPixels;
};
img.leftPos = st.readUnsigned();
img.topPos = st.readUnsigned();
img.width = st.readUnsigned();
img.height = st.readUnsigned();
var bits = byteToBitArr(st.readByte());
img.lctFlag = bits.shift();
img.interlaced = bits.shift();
img.sorted = bits.shift();
img.reserved = bits.splice(0, 2);
img.lctSize = bitsToNum(bits.splice(0, 3));
if (img.lctFlag) {
img.lct = parseCT(1 << (img.lctSize + 1));
}
img.lzwMinCodeSize = st.readByte();
var lzwData = readSubBlocks();
img.pixels = lzwDecode(img.lzwMinCodeSize, lzwData);
if (img.interlaced) { // Move
img.pixels = deinterlace(img.pixels, img.width);
}
handler.img && handler.img(img);
};
var parseBlock = function () {
var block = {};
block.sentinel = st.readByte();
switch (String.fromCharCode(block.sentinel)) { // For ease of matching
case '!':
block.type = 'ext';
parseExt(block);
break;
case ',':
block.type = 'img';
parseImg(block);
break;
case ';':
block.type = 'eof';
handler.eof && handler.eof(block);
break;
default:
throw new Error('Unknown block: 0x' + block.sentinel.toString(16)); // TODO: Pad this with a 0.
}
// if (block.type !== 'eof') setTimeout(parseBlock,0);
if (block.type !== 'eof') parseBlock();
};
var parse = function () {
parseHeader();
parseBlock();
// setTimeout(parseBlock, 0);
};
parse();
};
// BEGIN_NON_BOOKMARKLET_CODE
exports.Stream = Stream;
exports.parseGIF = parseGIF;
exports.decode = function (buffer) {
var gifData = { images: [] };
var gct;
var GCE;
var log = console.log;
// var showBool = function (b) {
// return b ? 'yes' : 'no';
// };
// var showColor = function (rgb) {
// // FIXME When I have an Internet connection.
// var showHex = function (n) { // Two-digit code.
// var hexChars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
// return hexChars[(n >>> 4) & 0xF] + hexChars[n & 0xF];
// };
// return '#' + showHex(rgb[0]) + showHex(rgb[1]) + showHex(rgb[2]);
// };
// var showDisposalMethod = function (dm) {
// var map = {
// 0: 'None',
// 1: 'Do not dispose',
// 2: 'Restore to background',
// 3: 'Restore to previous'
// };
// return map[dm] || 'Unknown';
// }
//尺寸 背景色 调色板 等
var doHdr = function (hdr) {
// log('Header:');
// log(' Version: %s', hdr.ver);
// log(' Size: %dx%d', hdr.width, hdr.height);
// log(' GCT? %s%s', showBool(hdr.gctFlag), hdr.gctFlag ? ' (' + hdr.gct.length + ' entries)' : '');
// log(' Color resolution: %d', hdr.colorRes);
// log(' Sorted? %s', showBool(hdr.sorted));
// log(' Background color: %s (%d)', hdr.gctFlag ? showColor(hdr.bgColor) : 'no GCT', hdr.bgColor);
// log(' Pixel aspect ratio: %d FIXME', hdr.pixelAspectRatio);
gct = hdr.gct;
gifData.width = hdr.width;
gifData.height = hdr.height;
};
//当前帧的非颜色信息 (透明色,延时 等))
var doGCE = function (gce) {
// log('GCE:');
// log(' Disposal method: %d (%s)', gce.disposalMethod, showDisposalMethod(gce.disposalMethod));
// log(' User input expected? %s', showBool(gce.userInput));
// log(' Transparency given? %s%s', showBool(gce.transparencyGiven),
// gce.transparencyGiven ? ' (index: ' + gce.transparencyIndex + ')' : '');
// log(' Delay time: %d', gce.delayTime);
GCE = gce;
};
//当前帧的图片图像信息
var doImg = function (img) {
// log('Image descriptor:');
// log(Object.assign({},img,{'pixels':Math.max.apply(Math,img.pixels)}));
// log(' Geometry: %dx%d+%d+%d', img.width, img.height, img.leftPos, img.topPos);
// log(' LCT? %s%s', showBool(img.lctFlag), img.lctFlag ? ' (' + img.lct.length + ' entries)' : '');
// log(' Interlaced? %s', showBool(img.interlaced));
// log(' %d pixels', img.pixels.length);
var data = [];
var imageData = {
left: img.leftPos,
top: img.topPos,
width: img.width,
height: img.height,
data: data
}
img.pixels.forEach(function (v) {
var color = gct[v];
data.push.apply(data, color.concat(GCE.transparencyIndex == v ? 0 : 255));
})
gifData.images.push(imageData);
};
var doNetscape = function (block) {
// log('Netscape application extension:');
// log(' Iterations: %d%s', block.iterations, block.iterations === 0 ? ' (infinite)' : '');
};
var doCom = function (com) {
// log('Comment extension:');
// log(' Comment: %s', com.comment);
};
var doEOF = function (eof) {
// log('EOF:');
// log(eof);
};
var doUnknownApp = function (block) {
// log(block)
};
var doUnknownExt = function (block) {
// log(block)
}
var handler = {
hdr: doHdr,
img: doImg,
gce: doGCE,
com: doCom,
app: {
NETSCAPE: doNetscape,
unknown: doUnknownApp
},
eof: doEOF
};
var st = new Stream(buffer.toString('binary'));
parseGIF(st, handler);
return gifData;
}

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var jpg = require('./jpg');
var jpgDecode = new jpg.JpegDecoder();
var pngDecode = require('./png').decode;
var bmpDecode = require('./bmp');
var gifDecode = require('./gif').decode;
var gif1Decode = require('./gif.1').decode;
exports.bmp = function (buffer) {
// return new Promise(function (res, rej) {
// res(bmpDecode(buffer));
// })
return bmpDecode(buffer);
};
exports.jpg = function (buffer) {
// return new Promise(function (res, rej) {
// jpgDecode.parse(buffer);
// res(jpgDecode.getImageData());
// })
jpgDecode.parse(buffer);
return jpgDecode.getImageData();
}
exports.png = function (buffer) {
// return new Promise(function (res, rej) {
// var png = pngDecode(buffer);
// res({
// data: png.data,
// width: png.width,
// height: png.height
// });
// })
var png = pngDecode(buffer);
return {
data: png.data,
width: png.width,
height: png.height
};
}
exports.gif = function (data) {
// return new Promise(function (res, rej) {
// var gif = gifDecode(data);
// res(gif.images);
// })
var gif = gifDecode(data);
return gif.images;
}
exports.gif1 = function (data) {
// return new Promise(function (res, rej) {
// var gif = gifDecode(data);
// res(gif.images);
// })
var gif = gif1Decode(data);
return gif.images;
}

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// https://github.com/arian/pngjs
var UPNG = {};
// Make available for import by `require()`
var pako = require("pako");
function log() { if (typeof process == "undefined" || process.env.NODE_ENV == "development") console.log.apply(console, arguments); }
UPNG.toRGBA8 = function (out) {
var w = out.width, h = out.height;
if (out.tabs.acTL == null) return [UPNG.toRGBA8.decodeImage(out.data, w, h, out).buffer];
var frms = [];
if (out.frames[0].data == null) out.frames[0].data = out.data;
var img, empty = new Uint8Array(w * h * 4);
for (var i = 0; i < out.frames.length; i++) {
var frm = out.frames[i];
var fx = frm.rect.x, fy = frm.rect.y, fw = frm.rect.width, fh = frm.rect.height;
var fdata = UPNG.toRGBA8.decodeImage(frm.data, fw, fh, out);
if (i == 0) img = fdata;
else if (frm.blend == 0) UPNG._copyTile(fdata, fw, fh, img, w, h, fx, fy, 0);
else if (frm.blend == 1) UPNG._copyTile(fdata, fw, fh, img, w, h, fx, fy, 1);
frms.push(img.buffer); img = img.slice(0);
if (frm.dispose == 0) { }
else if (frm.dispose == 1) UPNG._copyTile(empty, fw, fh, img, w, h, fx, fy, 0);
else if (frm.dispose == 2) {
var pi = i - 1;
while (out.frames[pi].dispose == 2) pi--;
img = new Uint8Array(frms[pi]).slice(0);
}
}
return frms;
}
UPNG.toRGBA8.decodeImage = function (data, w, h, out) {
var area = w * h, bpp = UPNG.decode._getBPP(out);
var bpl = Math.ceil(w * bpp / 8); // bytes per line
var bf = new Uint8Array(area * 4), bf32 = new Uint32Array(bf.buffer);
var ctype = out.ctype, depth = out.depth;
var rs = UPNG._bin.readUshort;
//console.log(ctype, depth);
if (ctype == 6) { // RGB + alpha
var qarea = area << 2;
if (depth == 8) for (var i = 0; i < qarea; i++) { bf[i] = data[i]; /*if((i&3)==3 && data[i]!=0) bf[i]=255;*/ }
if (depth == 16) for (var i = 0; i < qarea; i++) { bf[i] = data[i << 1]; }
}
else if (ctype == 2) { // RGB
var ts = out.tabs["tRNS"], tr = -1, tg = -1, tb = -1;
if (ts) { tr = ts[0]; tg = ts[1]; tb = ts[2]; }
if (depth == 8) for (var i = 0; i < area; i++) {
var qi = i << 2, ti = i * 3; bf[qi] = data[ti]; bf[qi + 1] = data[ti + 1]; bf[qi + 2] = data[ti + 2]; bf[qi + 3] = 255;
if (tr != -1 && data[ti] == tr && data[ti + 1] == tg && data[ti + 2] == tb) bf[qi + 3] = 0;
}
if (depth == 16) for (var i = 0; i < area; i++) {
var qi = i << 2, ti = i * 6; bf[qi] = data[ti]; bf[qi + 1] = data[ti + 2]; bf[qi + 2] = data[ti + 4]; bf[qi + 3] = 255;
if (tr != -1 && rs(data, ti) == tr && rs(data, ti + 2) == tg && rs(data, ti + 4) == tb) bf[qi + 3] = 0;
}
}
else if (ctype == 3) { // palette
var p = out.tabs["PLTE"], ap = out.tabs["tRNS"], tl = ap ? ap.length : 0;
//console.log(p, ap);
if (depth == 1) for (var y = 0; y < h; y++) {
var s0 = y * bpl, t0 = y * w;
for (var i = 0; i < w; i++) { var qi = (t0 + i) << 2, j = ((data[s0 + (i >> 3)] >> (7 - ((i & 7) << 0))) & 1), cj = 3 * j; bf[qi] = p[cj]; bf[qi + 1] = p[cj + 1]; bf[qi + 2] = p[cj + 2]; bf[qi + 3] = (j < tl) ? ap[j] : 255; }
}
if (depth == 2) for (var y = 0; y < h; y++) {
var s0 = y * bpl, t0 = y * w;
for (var i = 0; i < w; i++) { var qi = (t0 + i) << 2, j = ((data[s0 + (i >> 2)] >> (6 - ((i & 3) << 1))) & 3), cj = 3 * j; bf[qi] = p[cj]; bf[qi + 1] = p[cj + 1]; bf[qi + 2] = p[cj + 2]; bf[qi + 3] = (j < tl) ? ap[j] : 255; }
}
if (depth == 4) for (var y = 0; y < h; y++) {
var s0 = y * bpl, t0 = y * w;
for (var i = 0; i < w; i++) { var qi = (t0 + i) << 2, j = ((data[s0 + (i >> 1)] >> (4 - ((i & 1) << 2))) & 15), cj = 3 * j; bf[qi] = p[cj]; bf[qi + 1] = p[cj + 1]; bf[qi + 2] = p[cj + 2]; bf[qi + 3] = (j < tl) ? ap[j] : 255; }
}
if (depth == 8) for (var i = 0; i < area; i++) { var qi = i << 2, j = data[i], cj = 3 * j; bf[qi] = p[cj]; bf[qi + 1] = p[cj + 1]; bf[qi + 2] = p[cj + 2]; bf[qi + 3] = (j < tl) ? ap[j] : 255; }
}
else if (ctype == 4) { // gray + alpha
if (depth == 8) for (var i = 0; i < area; i++) { var qi = i << 2, di = i << 1, gr = data[di]; bf[qi] = gr; bf[qi + 1] = gr; bf[qi + 2] = gr; bf[qi + 3] = data[di + 1]; }
if (depth == 16) for (var i = 0; i < area; i++) { var qi = i << 2, di = i << 2, gr = data[di]; bf[qi] = gr; bf[qi + 1] = gr; bf[qi + 2] = gr; bf[qi + 3] = data[di + 2]; }
}
else if (ctype == 0) { // gray
var tr = out.tabs["tRNS"] ? out.tabs["tRNS"] : -1;
if (depth == 1) for (var i = 0; i < area; i++) { var gr = 255 * ((data[i >> 3] >> (7 - ((i & 7)))) & 1), al = (gr == tr * 255) ? 0 : 255; bf32[i] = (al << 24) | (gr << 16) | (gr << 8) | gr; }
if (depth == 2) for (var i = 0; i < area; i++) { var gr = 85 * ((data[i >> 2] >> (6 - ((i & 3) << 1))) & 3), al = (gr == tr * 85) ? 0 : 255; bf32[i] = (al << 24) | (gr << 16) | (gr << 8) | gr; }
if (depth == 4) for (var i = 0; i < area; i++) { var gr = 17 * ((data[i >> 1] >> (4 - ((i & 1) << 2))) & 15), al = (gr == tr * 17) ? 0 : 255; bf32[i] = (al << 24) | (gr << 16) | (gr << 8) | gr; }
if (depth == 8) for (var i = 0; i < area; i++) { var gr = data[i], al = (gr == tr) ? 0 : 255; bf32[i] = (al << 24) | (gr << 16) | (gr << 8) | gr; }
if (depth == 16) for (var i = 0; i < area; i++) { var gr = data[i << 1], al = (rs(data, i << 1) == tr) ? 0 : 255; bf32[i] = (al << 24) | (gr << 16) | (gr << 8) | gr; }
}
return bf;
}
UPNG.decode = function (buff) {
var data = new Uint8Array(buff), offset = 8, bin = UPNG._bin, rUs = bin.readUshort, rUi = bin.readUint;
var out = { tabs: {}, frames: [] };
var dd = new Uint8Array(data.length), doff = 0; // put all IDAT data into it
var fd, foff = 0; // frames
var mgck = [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];
for (var i = 0; i < 8; i++) if (data[i] != mgck[i]) throw "The input is not a PNG file!";
while (offset < data.length) {
var len = bin.readUint(data, offset); offset += 4;
var type = bin.readASCII(data, offset, 4); offset += 4;
//console.log(type,len);
if (type == "IHDR") { UPNG.decode._IHDR(data, offset, out); }
else if (type == "IDAT") {
for (var i = 0; i < len; i++) dd[doff + i] = data[offset + i];
doff += len;
}
else if (type == "acTL") {
out.tabs[type] = { num_frames: rUi(data, offset), num_plays: rUi(data, offset + 4) };
fd = new Uint8Array(data.length);
}
else if (type == "fcTL") {
if (foff != 0) {
var fr = out.frames[out.frames.length - 1];
fr.data = UPNG.decode._decompress(out, fd.slice(0, foff), fr.rect.width, fr.rect.height); foff = 0;
}
var rct = { x: rUi(data, offset + 12), y: rUi(data, offset + 16), width: rUi(data, offset + 4), height: rUi(data, offset + 8) };
var del = rUs(data, offset + 22); del = rUs(data, offset + 20) / (del == 0 ? 100 : del);
var frm = { rect: rct, delay: Math.round(del * 1000), dispose: data[offset + 24], blend: data[offset + 25] };
//console.log(frm);
out.frames.push(frm);
}
else if (type == "fdAT") {
for (var i = 0; i < len - 4; i++) fd[foff + i] = data[offset + i + 4];
foff += len - 4;
}
else if (type == "pHYs") {
out.tabs[type] = [bin.readUint(data, offset), bin.readUint(data, offset + 4), data[offset + 8]];
}
else if (type == "cHRM") {
out.tabs[type] = [];
for (var i = 0; i < 8; i++) out.tabs[type].push(bin.readUint(data, offset + i * 4));
}
else if (type == "tEXt") {
if (out.tabs[type] == null) out.tabs[type] = {};
var nz = bin.nextZero(data, offset);
var keyw = bin.readASCII(data, offset, nz - offset);
var text = bin.readASCII(data, nz + 1, offset + len - nz - 1);
out.tabs[type][keyw] = text;
}
else if (type == "iTXt") {
if (out.tabs[type] == null) out.tabs[type] = {};
var nz = 0, off = offset;
nz = bin.nextZero(data, off);
var keyw = bin.readASCII(data, off, nz - off); off = nz + 1;
var cflag = data[off], cmeth = data[off + 1]; off += 2;
nz = bin.nextZero(data, off);
var ltag = bin.readASCII(data, off, nz - off); off = nz + 1;
nz = bin.nextZero(data, off);
var tkeyw = bin.readUTF8(data, off, nz - off); off = nz + 1;
var text = bin.readUTF8(data, off, len - (off - offset));
out.tabs[type][keyw] = text;
}
else if (type == "PLTE") {
out.tabs[type] = bin.readBytes(data, offset, len);
}
else if (type == "hIST") {
var pl = out.tabs["PLTE"].length / 3;
out.tabs[type] = []; for (var i = 0; i < pl; i++) out.tabs[type].push(rUs(data, offset + i * 2));
}
else if (type == "tRNS") {
if (out.ctype == 3) out.tabs[type] = bin.readBytes(data, offset, len);
else if (out.ctype == 0) out.tabs[type] = rUs(data, offset);
else if (out.ctype == 2) out.tabs[type] = [rUs(data, offset), rUs(data, offset + 2), rUs(data, offset + 4)];
//else console.log("tRNS for unsupported color type",out.ctype, len);
}
else if (type == "gAMA") out.tabs[type] = bin.readUint(data, offset) / 100000;
else if (type == "sRGB") out.tabs[type] = data[offset];
else if (type == "bKGD") {
if (out.ctype == 0 || out.ctype == 4) out.tabs[type] = [rUs(data, offset)];
else if (out.ctype == 2 || out.ctype == 6) out.tabs[type] = [rUs(data, offset), rUs(data, offset + 2), rUs(data, offset + 4)];
else if (out.ctype == 3) out.tabs[type] = data[offset];
}
else if (type == "IEND") {
break;
}
//else { log("unknown chunk type", type, len); }
offset += len;
var crc = bin.readUint(data, offset); offset += 4;
}
if (foff != 0) {
var fr = out.frames[out.frames.length - 1];
fr.data = UPNG.decode._decompress(out, fd.slice(0, foff), fr.rect.width, fr.rect.height); foff = 0;
}
out.data = UPNG.decode._decompress(out, dd, out.width, out.height);
delete out.compress; delete out.interlace; delete out.filter;
return out;
}
UPNG.decode._decompress = function (out, dd, w, h) {
if (out.compress == 0) dd = UPNG.decode._inflate(dd);
if (out.interlace == 0) dd = UPNG.decode._filterZero(dd, out, 0, w, h);
else if (out.interlace == 1) dd = UPNG.decode._readInterlace(dd, out);
return dd;
}
UPNG.decode._inflate = function (data) { return pako["inflate"](data); }
UPNG.decode._readInterlace = function (data, out) {
var w = out.width, h = out.height;
var bpp = UPNG.decode._getBPP(out), cbpp = bpp >> 3, bpl = Math.ceil(w * bpp / 8);
var img = new Uint8Array(h * bpl);
var di = 0;
var starting_row = [0, 0, 4, 0, 2, 0, 1];
var starting_col = [0, 4, 0, 2, 0, 1, 0];
var row_increment = [8, 8, 8, 4, 4, 2, 2];
var col_increment = [8, 8, 4, 4, 2, 2, 1];
var pass = 0;
while (pass < 7) {
var ri = row_increment[pass], ci = col_increment[pass];
var sw = 0, sh = 0;
var cr = starting_row[pass]; while (cr < h) { cr += ri; sh++; }
var cc = starting_col[pass]; while (cc < w) { cc += ci; sw++; }
var bpll = Math.ceil(sw * bpp / 8);
UPNG.decode._filterZero(data, out, di, sw, sh);
var y = 0, row = starting_row[pass];
while (row < h) {
var col = starting_col[pass];
var cdi = (di + y * bpll) << 3;
while (col < w) {
if (bpp == 1) {
var val = data[cdi >> 3]; val = (val >> (7 - (cdi & 7))) & 1;
img[row * bpl + (col >> 3)] |= (val << (7 - ((col & 3) << 0)));
}
if (bpp == 2) {
var val = data[cdi >> 3]; val = (val >> (6 - (cdi & 7))) & 3;
img[row * bpl + (col >> 2)] |= (val << (6 - ((col & 3) << 1)));
}
if (bpp == 4) {
var val = data[cdi >> 3]; val = (val >> (4 - (cdi & 7))) & 15;
img[row * bpl + (col >> 1)] |= (val << (4 - ((col & 1) << 2)));
}
if (bpp >= 8) {
var ii = row * bpl + col * cbpp;
for (var j = 0; j < cbpp; j++) img[ii + j] = data[(cdi >> 3) + j];
}
cdi += bpp; col += ci;
}
y++; row += ri;
}
if (sw * sh != 0) di += sh * (1 + bpll);
pass = pass + 1;
}
return img;
}
UPNG.decode._getBPP = function (out) {
var noc = [1, null, 3, 1, 2, null, 4][out.ctype];
return noc * out.depth;
}
UPNG.decode._filterZero = function (data, out, off, w, h) {
var bpp = UPNG.decode._getBPP(out), bpl = Math.ceil(w * bpp / 8), paeth = UPNG.decode._paeth;
bpp = Math.ceil(bpp / 8);
for (var y = 0; y < h; y++) {
var i = off + y * bpl, di = i + y + 1;
var type = data[di - 1];
if (type == 0) for (var x = 0; x < bpl; x++) data[i + x] = data[di + x];
else if (type == 1) {
for (var x = 0; x < bpp; x++) data[i + x] = data[di + x];
for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x] + data[i + x - bpp]) & 255;
}
else if (y == 0) {
for (var x = 0; x < bpp; x++) data[i + x] = data[di + x];
if (type == 2) for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x]) & 255;
if (type == 3) for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x] + (data[i + x - bpp] >> 1)) & 255;
if (type == 4) for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x] + paeth(data[i + x - bpp], 0, 0)) & 255;
}
else {
if (type == 2) { for (var x = 0; x < bpl; x++) data[i + x] = (data[di + x] + data[i + x - bpl]) & 255; }
if (type == 3) {
for (var x = 0; x < bpp; x++) data[i + x] = (data[di + x] + (data[i + x - bpl] >> 1)) & 255;
for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x] + ((data[i + x - bpl] + data[i + x - bpp]) >> 1)) & 255;
}
if (type == 4) {
for (var x = 0; x < bpp; x++) data[i + x] = (data[di + x] + paeth(0, data[i + x - bpl], 0)) & 255;
for (var x = bpp; x < bpl; x++) data[i + x] = (data[di + x] + paeth(data[i + x - bpp], data[i + x - bpl], data[i + x - bpp - bpl])) & 255;
}
}
}
return data;
}
UPNG.decode._paeth = function (a, b, c) {
var p = a + b - c, pa = Math.abs(p - a), pb = Math.abs(p - b), pc = Math.abs(p - c);
if (pa <= pb && pa <= pc) return a;
else if (pb <= pc) return b;
return c;
}
UPNG.decode._IHDR = function (data, offset, out) {
var bin = UPNG._bin;
out.width = bin.readUint(data, offset); offset += 4;
out.height = bin.readUint(data, offset); offset += 4;
out.depth = data[offset]; offset++;
out.ctype = data[offset]; offset++;
out.compress = data[offset]; offset++;
out.filter = data[offset]; offset++;
out.interlace = data[offset]; offset++;
}
UPNG._bin = {
nextZero: function (data, p) { while (data[p] != 0) p++; return p; },
readUshort: function (buff, p) { return (buff[p] << 8) | buff[p + 1]; },
writeUshort: function (buff, p, n) { buff[p] = (n >> 8) & 255; buff[p + 1] = n & 255; },
readUint: function (buff, p) { return (buff[p] * (256 * 256 * 256)) + ((buff[p + 1] << 16) | (buff[p + 2] << 8) | buff[p + 3]); },
writeUint: function (buff, p, n) { buff[p] = (n >> 24) & 255; buff[p + 1] = (n >> 16) & 255; buff[p + 2] = (n >> 8) & 255; buff[p + 3] = n & 255; },
readASCII: function (buff, p, l) { var s = ""; for (var i = 0; i < l; i++) s += String.fromCharCode(buff[p + i]); return s; },
writeASCII: function (data, p, s) { for (var i = 0; i < s.length; i++) data[p + i] = s.charCodeAt(i); },
readBytes: function (buff, p, l) { var arr = []; for (var i = 0; i < l; i++) arr.push(buff[p + i]); return arr; },
pad: function (n) { return n.length < 2 ? "0" + n : n; },
readUTF8: function (buff, p, l) {
var s = "", ns;
for (var i = 0; i < l; i++) s += "%" + UPNG._bin.pad(buff[p + i].toString(16));
try { ns = decodeURIComponent(s); }
catch (e) { return UPNG._bin.readASCII(buff, p, l); }
return ns;
}
}
UPNG._copyTile = function (sb, sw, sh, tb, tw, th, xoff, yoff, mode) {
var w = Math.min(sw, tw), h = Math.min(sh, th);
var si = 0, ti = 0;
for (var y = 0; y < h; y++)
for (var x = 0; x < w; x++) {
if (xoff >= 0 && yoff >= 0) { si = (y * sw + x) << 2; ti = ((yoff + y) * tw + xoff + x) << 2; }
else { si = ((-yoff + y) * sw - xoff + x) << 2; ti = (y * tw + x) << 2; }
if (mode == 0) { tb[ti] = sb[si]; tb[ti + 1] = sb[si + 1]; tb[ti + 2] = sb[si + 2]; tb[ti + 3] = sb[si + 3]; }
else if (mode == 1) {
var fa = sb[si + 3] * (1 / 255), fr = sb[si] * fa, fg = sb[si + 1] * fa, fb = sb[si + 2] * fa;
var ba = tb[ti + 3] * (1 / 255), br = tb[ti] * ba, bg = tb[ti + 1] * ba, bb = tb[ti + 2] * ba;
var ifa = 1 - fa, oa = fa + ba * ifa, ioa = (oa == 0 ? 0 : 1 / oa);
tb[ti + 3] = 255 * oa;
tb[ti + 0] = (fr + br * ifa) * ioa;
tb[ti + 1] = (fg + bg * ifa) * ioa;
tb[ti + 2] = (fb + bb * ifa) * ioa;
}
else if (mode == 2) { // copy only differences, otherwise zero
var fa = sb[si + 3], fr = sb[si], fg = sb[si + 1], fb = sb[si + 2];
var ba = tb[ti + 3], br = tb[ti], bg = tb[ti + 1], bb = tb[ti + 2];
if (fa == ba && fr == br && fg == bg && fb == bb) { tb[ti] = 0; tb[ti + 1] = 0; tb[ti + 2] = 0; tb[ti + 3] = 0; }
else { tb[ti] = fr; tb[ti + 1] = fg; tb[ti + 2] = fb; tb[ti + 3] = fa; }
}
else if (mode == 3) { // check if can be blended
var fa = sb[si + 3], fr = sb[si], fg = sb[si + 1], fb = sb[si + 2];
var ba = tb[ti + 3], br = tb[ti], bg = tb[ti + 1], bb = tb[ti + 2];
if (fa == ba && fr == br && fg == bg && fb == bb) continue;
//if(fa!=255 && ba!=0) return false;
if (fa < 220 && ba > 20) return false;
}
}
return true;
}
UPNG.encode = function (bufs, w, h, ps, dels, forbidPlte) {
if (ps == null) ps = 0;
if (forbidPlte == null) forbidPlte = false;
var nimg = UPNG.encode.compress(bufs, w, h, ps, false, forbidPlte);
UPNG.encode.compressPNG(nimg, -1);
return UPNG.encode._main(nimg, w, h, dels);
}
UPNG.encodeLL = function (bufs, w, h, cc, ac, depth, dels) {
var nimg = { ctype: 0 + (cc == 1 ? 0 : 2) + (ac == 0 ? 0 : 4), depth: depth, frames: [] };
var bipp = (cc + ac) * depth, bipl = bipp * w;
for (var i = 0; i < bufs.length; i++)
nimg.frames.push({ rect: { x: 0, y: 0, width: w, height: h }, img: new Uint8Array(bufs[i]), blend: 0, dispose: 1, bpp: Math.ceil(bipp / 8), bpl: Math.ceil(bipl / 8) });
UPNG.encode.compressPNG(nimg, 4);
return UPNG.encode._main(nimg, w, h, dels);
}
UPNG.encode._main = function (nimg, w, h, dels) {
var crc = UPNG.crc.crc, wUi = UPNG._bin.writeUint, wUs = UPNG._bin.writeUshort, wAs = UPNG._bin.writeASCII;
var offset = 8, anim = nimg.frames.length > 1, pltAlpha = false;
var leng = 8 + (16 + 5 + 4) + (9 + 4) + (anim ? 20 : 0);
if (nimg.ctype == 3) {
var dl = nimg.plte.length;
for (var i = 0; i < dl; i++) if ((nimg.plte[i] >>> 24) != 255) pltAlpha = true;
leng += (8 + dl * 3 + 4) + (pltAlpha ? (8 + dl * 1 + 4) : 0);
}
for (var j = 0; j < nimg.frames.length; j++) {
var fr = nimg.frames[j];
if (anim) leng += 38;
leng += fr.cimg.length + 12;
if (j != 0) leng += 4;
}
leng += 12;
var data = new Uint8Array(leng);
var wr = [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];
for (var i = 0; i < 8; i++) data[i] = wr[i];
wUi(data, offset, 13); offset += 4;
wAs(data, offset, "IHDR"); offset += 4;
wUi(data, offset, w); offset += 4;
wUi(data, offset, h); offset += 4;
data[offset] = nimg.depth; offset++; // depth
data[offset] = nimg.ctype; offset++; // ctype
data[offset] = 0; offset++; // compress
data[offset] = 0; offset++; // filter
data[offset] = 0; offset++; // interlace
wUi(data, offset, crc(data, offset - 17, 17)); offset += 4; // crc
// 9 bytes to say, that it is sRGB
wUi(data, offset, 1); offset += 4;
wAs(data, offset, "sRGB"); offset += 4;
data[offset] = 1; offset++;
wUi(data, offset, crc(data, offset - 5, 5)); offset += 4; // crc
if (anim) {
wUi(data, offset, 8); offset += 4;
wAs(data, offset, "acTL"); offset += 4;
wUi(data, offset, nimg.frames.length); offset += 4;
wUi(data, offset, 0); offset += 4;
wUi(data, offset, crc(data, offset - 12, 12)); offset += 4; // crc
}
if (nimg.ctype == 3) {
var dl = nimg.plte.length;
wUi(data, offset, dl * 3); offset += 4;
wAs(data, offset, "PLTE"); offset += 4;
for (var i = 0; i < dl; i++) {
var ti = i * 3, c = nimg.plte[i], r = (c) & 255, g = (c >>> 8) & 255, b = (c >>> 16) & 255;
data[offset + ti + 0] = r; data[offset + ti + 1] = g; data[offset + ti + 2] = b;
}
offset += dl * 3;
wUi(data, offset, crc(data, offset - dl * 3 - 4, dl * 3 + 4)); offset += 4; // crc
if (pltAlpha) {
wUi(data, offset, dl); offset += 4;
wAs(data, offset, "tRNS"); offset += 4;
for (var i = 0; i < dl; i++) data[offset + i] = (nimg.plte[i] >>> 24) & 255;
offset += dl;
wUi(data, offset, crc(data, offset - dl - 4, dl + 4)); offset += 4; // crc
}
}
var fi = 0;
for (var j = 0; j < nimg.frames.length; j++) {
var fr = nimg.frames[j];
if (anim) {
wUi(data, offset, 26); offset += 4;
wAs(data, offset, "fcTL"); offset += 4;
wUi(data, offset, fi++); offset += 4;
wUi(data, offset, fr.rect.width); offset += 4;
wUi(data, offset, fr.rect.height); offset += 4;
wUi(data, offset, fr.rect.x); offset += 4;
wUi(data, offset, fr.rect.y); offset += 4;
wUs(data, offset, dels[j]); offset += 2;
wUs(data, offset, 1000); offset += 2;
data[offset] = fr.dispose; offset++; // dispose
data[offset] = fr.blend; offset++; // blend
wUi(data, offset, crc(data, offset - 30, 30)); offset += 4; // crc
}
var imgd = fr.cimg, dl = imgd.length;
wUi(data, offset, dl + (j == 0 ? 0 : 4)); offset += 4;
var ioff = offset;
wAs(data, offset, (j == 0) ? "IDAT" : "fdAT"); offset += 4;
if (j != 0) { wUi(data, offset, fi++); offset += 4; }
for (var i = 0; i < dl; i++) data[offset + i] = imgd[i];
offset += dl;
wUi(data, offset, crc(data, ioff, offset - ioff)); offset += 4; // crc
}
wUi(data, offset, 0); offset += 4;
wAs(data, offset, "IEND"); offset += 4;
wUi(data, offset, crc(data, offset - 4, 4)); offset += 4; // crc
return data.buffer;
}
UPNG.encode.compressPNG = function (out, filter) {
for (var i = 0; i < out.frames.length; i++) {
var frm = out.frames[i], nw = frm.rect.width, nh = frm.rect.height;
var fdata = new Uint8Array(nh * frm.bpl + nh);
frm.cimg = UPNG.encode._filterZero(frm.img, nh, frm.bpp, frm.bpl, fdata, filter);
}
}
UPNG.encode.compress = function (bufs, w, h, ps, forGIF, forbidPlte) {
//var time = Date.now();
if (forbidPlte == null) forbidPlte = false;
var ctype = 6, depth = 8, alphaAnd = 255
for (var j = 0; j < bufs.length; j++) { // when not quantized, other frames can contain colors, that are not in an initial frame
var img = new Uint8Array(bufs[j]), ilen = img.length;
for (var i = 0; i < ilen; i += 4) alphaAnd &= img[i + 3];
}
var gotAlpha = (alphaAnd != 255);
//console.log("alpha check", Date.now()-time); time = Date.now();
var brute = gotAlpha && forGIF; // brute : frames can only be copied, not "blended"
var frms = UPNG.encode.framize(bufs, w, h, forGIF, brute);
//console.log("framize", Date.now()-time); time = Date.now();
var cmap = {}, plte = [], inds = [];
if (ps != 0) {
var nbufs = []; for (var i = 0; i < frms.length; i++) nbufs.push(frms[i].img.buffer);
var abuf = UPNG.encode.concatRGBA(nbufs, forGIF), qres = UPNG.quantize(abuf, ps);
var cof = 0, bb = new Uint8Array(qres.abuf);
for (var i = 0; i < frms.length; i++) {
var ti = frms[i].img, bln = ti.length; inds.push(new Uint8Array(qres.inds.buffer, cof >> 2, bln >> 2));
for (var j = 0; j < bln; j += 4) { ti[j] = bb[cof + j]; ti[j + 1] = bb[cof + j + 1]; ti[j + 2] = bb[cof + j + 2]; ti[j + 3] = bb[cof + j + 3]; } cof += bln;
}
for (var i = 0; i < qres.plte.length; i++) plte.push(qres.plte[i].est.rgba);
//console.log("quantize", Date.now()-time); time = Date.now();
}
else {
// what if ps==0, but there are <=256 colors? we still need to detect, if the palette could be used
for (var j = 0; j < frms.length; j++) { // when not quantized, other frames can contain colors, that are not in an initial frame
var frm = frms[j], img32 = new Uint32Array(frm.img.buffer), nw = frm.rect.width, ilen = img32.length;
var ind = new Uint8Array(ilen); inds.push(ind);
for (var i = 0; i < ilen; i++) {
var c = img32[i];
if (i != 0 && c == img32[i - 1]) ind[i] = ind[i - 1];
else if (i > nw && c == img32[i - nw]) ind[i] = ind[i - nw];
else {
var cmc = cmap[c];
if (cmc == null) { cmap[c] = cmc = plte.length; plte.push(c); if (plte.length >= 300) break; }
ind[i] = cmc;
}
}
}
//console.log("make palette", Date.now()-time); time = Date.now();
}
var cc = plte.length; //console.log("colors:",cc);
if (cc <= 256 && forbidPlte == false) {
if (cc <= 2) depth = 1; else if (cc <= 4) depth = 2; else if (cc <= 16) depth = 4; else depth = 8;
if (forGIF) depth = 8;
}
for (var j = 0; j < frms.length; j++) {
var frm = frms[j], nx = frm.rect.x, ny = frm.rect.y, nw = frm.rect.width, nh = frm.rect.height;
var cimg = frm.img, cimg32 = new Uint32Array(cimg.buffer);
var bpl = 4 * nw, bpp = 4;
if (cc <= 256 && forbidPlte == false) {
bpl = Math.ceil(depth * nw / 8);
var nimg = new Uint8Array(bpl * nh);
var inj = inds[j];
for (var y = 0; y < nh; y++) {
var i = y * bpl, ii = y * nw;
if (depth == 8) for (var x = 0; x < nw; x++) nimg[i + (x)] = (inj[ii + x]);
else if (depth == 4) for (var x = 0; x < nw; x++) nimg[i + (x >> 1)] |= (inj[ii + x] << (4 - (x & 1) * 4));
else if (depth == 2) for (var x = 0; x < nw; x++) nimg[i + (x >> 2)] |= (inj[ii + x] << (6 - (x & 3) * 2));
else if (depth == 1) for (var x = 0; x < nw; x++) nimg[i + (x >> 3)] |= (inj[ii + x] << (7 - (x & 7) * 1));
}
cimg = nimg; ctype = 3; bpp = 1;
}
else if (gotAlpha == false && frms.length == 1) { // some next "reduced" frames may contain alpha for blending
var nimg = new Uint8Array(nw * nh * 3), area = nw * nh;
for (var i = 0; i < area; i++) { var ti = i * 3, qi = i * 4; nimg[ti] = cimg[qi]; nimg[ti + 1] = cimg[qi + 1]; nimg[ti + 2] = cimg[qi + 2]; }
cimg = nimg; ctype = 2; bpp = 3; bpl = 3 * nw;
}
frm.img = cimg; frm.bpl = bpl; frm.bpp = bpp;
}
//console.log("colors => palette indices", Date.now()-time); time = Date.now();
return { ctype: ctype, depth: depth, plte: plte, frames: frms };
}
UPNG.encode.framize = function (bufs, w, h, forGIF, brute) {
var frms = [];
for (var j = 0; j < bufs.length; j++) {
var cimg = new Uint8Array(bufs[j]), cimg32 = new Uint32Array(cimg.buffer);
var nx = 0, ny = 0, nw = w, nh = h, blend = 0;
if (j != 0 && !brute) {
var tlim = (forGIF || j == 1 || frms[frms.length - 2].dispose == 2) ? 1 : 2, tstp = 0, tarea = 1e9;
for (var it = 0; it < tlim; it++) {
var pimg = new Uint8Array(bufs[j - 1 - it]), p32 = new Uint32Array(bufs[j - 1 - it]);
var mix = w, miy = h, max = -1, may = -1;
for (var y = 0; y < h; y++) for (var x = 0; x < w; x++) {
var i = y * w + x;
if (cimg32[i] != p32[i]) {
if (x < mix) mix = x; if (x > max) max = x;
if (y < miy) miy = y; if (y > may) may = y;
}
}
var sarea = (max == -1) ? 1 : (max - mix + 1) * (may - miy + 1);
if (sarea < tarea) {
tarea = sarea; tstp = it;
if (max == -1) { nx = ny = 0; nw = nh = 1; }
else { nx = mix; ny = miy; nw = max - mix + 1; nh = may - miy + 1; }
}
}
var pimg = new Uint8Array(bufs[j - 1 - tstp]);
if (tstp == 1) frms[frms.length - 1].dispose = 2;
var nimg = new Uint8Array(nw * nh * 4), nimg32 = new Uint32Array(nimg.buffer);
UPNG._copyTile(pimg, w, h, nimg, nw, nh, -nx, -ny, 0);
if (UPNG._copyTile(cimg, w, h, nimg, nw, nh, -nx, -ny, 3)) {
UPNG._copyTile(cimg, w, h, nimg, nw, nh, -nx, -ny, 2); blend = 1;
}
else {
UPNG._copyTile(cimg, w, h, nimg, nw, nh, -nx, -ny, 0); blend = 0;
}
cimg = nimg;
}
else cimg = cimg.slice(0); // img may be rewrited further ... don't rewrite input
frms.push({ rect: { x: nx, y: ny, width: nw, height: nh }, img: cimg, blend: blend, dispose: brute ? 1 : 0 });
}
return frms;
}
UPNG.encode._filterZero = function (img, h, bpp, bpl, data, filter) {
if (filter != -1) {
for (var y = 0; y < h; y++) UPNG.encode._filterLine(data, img, y, bpl, bpp, filter);
return pako["deflate"](data);
}
var fls = [];
for (var t = 0; t < 5; t++) {
if (h * bpl > 500000 && (t == 2 || t == 3 || t == 4)) continue;
for (var y = 0; y < h; y++) UPNG.encode._filterLine(data, img, y, bpl, bpp, t);
fls.push(pako["deflate"](data)); if (bpp == 1) break;
}
var ti, tsize = 1e9;
for (var i = 0; i < fls.length; i++) if (fls[i].length < tsize) { ti = i; tsize = fls[i].length; }
return fls[ti];
}
UPNG.encode._filterLine = function (data, img, y, bpl, bpp, type) {
var i = y * bpl, di = i + y, paeth = UPNG.decode._paeth
data[di] = type; di++;
if (type == 0) for (var x = 0; x < bpl; x++) data[di + x] = img[i + x];
else if (type == 1) {
for (var x = 0; x < bpp; x++) data[di + x] = img[i + x];
for (var x = bpp; x < bpl; x++) data[di + x] = (img[i + x] - img[i + x - bpp] + 256) & 255;
}
else if (y == 0) {
for (var x = 0; x < bpp; x++) data[di + x] = img[i + x];
if (type == 2) for (var x = bpp; x < bpl; x++) data[di + x] = img[i + x];
if (type == 3) for (var x = bpp; x < bpl; x++) data[di + x] = (img[i + x] - (img[i + x - bpp] >> 1) + 256) & 255;
if (type == 4) for (var x = bpp; x < bpl; x++) data[di + x] = (img[i + x] - paeth(img[i + x - bpp], 0, 0) + 256) & 255;
}
else {
if (type == 2) { for (var x = 0; x < bpl; x++) data[di + x] = (img[i + x] + 256 - img[i + x - bpl]) & 255; }
if (type == 3) {
for (var x = 0; x < bpp; x++) data[di + x] = (img[i + x] + 256 - (img[i + x - bpl] >> 1)) & 255;
for (var x = bpp; x < bpl; x++) data[di + x] = (img[i + x] + 256 - ((img[i + x - bpl] + img[i + x - bpp]) >> 1)) & 255;
}
if (type == 4) {
for (var x = 0; x < bpp; x++) data[di + x] = (img[i + x] + 256 - paeth(0, img[i + x - bpl], 0)) & 255;
for (var x = bpp; x < bpl; x++) data[di + x] = (img[i + x] + 256 - paeth(img[i + x - bpp], img[i + x - bpl], img[i + x - bpp - bpl])) & 255;
}
}
}
UPNG.crc = {
table: (function () {
var tab = new Uint32Array(256);
for (var n = 0; n < 256; n++) {
var c = n;
for (var k = 0; k < 8; k++) {
if (c & 1) c = 0xedb88320 ^ (c >>> 1);
else c = c >>> 1;
}
tab[n] = c;
}
return tab;
})(),
update: function (c, buf, off, len) {
for (var i = 0; i < len; i++) c = UPNG.crc.table[(c ^ buf[off + i]) & 0xff] ^ (c >>> 8);
return c;
},
crc: function (b, o, l) { return UPNG.crc.update(0xffffffff, b, o, l) ^ 0xffffffff; }
}
UPNG.quantize = function (abuf, ps) {
var oimg = new Uint8Array(abuf), nimg = oimg.slice(0), nimg32 = new Uint32Array(nimg.buffer);
var KD = UPNG.quantize.getKDtree(nimg, ps);
var root = KD[0], leafs = KD[1];
var planeDst = UPNG.quantize.planeDst;
var sb = oimg, tb = nimg32, len = sb.length;
var inds = new Uint8Array(oimg.length >> 2);
for (var i = 0; i < len; i += 4) {
var r = sb[i] * (1 / 255), g = sb[i + 1] * (1 / 255), b = sb[i + 2] * (1 / 255), a = sb[i + 3] * (1 / 255);
// exact, but too slow :(
var nd = UPNG.quantize.getNearest(root, r, g, b, a);
//var nd = root;
//while(nd.left) nd = (planeDst(nd.est,r,g,b,a)<=0) ? nd.left : nd.right;
inds[i >> 2] = nd.ind;
tb[i >> 2] = nd.est.rgba;
}
return { abuf: nimg.buffer, inds: inds, plte: leafs };
}
UPNG.quantize.getKDtree = function (nimg, ps, err) {
if (err == null) err = 0.0001;
var nimg32 = new Uint32Array(nimg.buffer);
var root = { i0: 0, i1: nimg.length, bst: null, est: null, tdst: 0, left: null, right: null }; // basic statistic, extra statistic
root.bst = UPNG.quantize.stats(nimg, root.i0, root.i1); root.est = UPNG.quantize.estats(root.bst);
var leafs = [root];
while (leafs.length < ps) {
var maxL = 0, mi = 0;
for (var i = 0; i < leafs.length; i++) if (leafs[i].est.L > maxL) { maxL = leafs[i].est.L; mi = i; }
if (maxL < err) break;
var node = leafs[mi];
var s0 = UPNG.quantize.splitPixels(nimg, nimg32, node.i0, node.i1, node.est.e, node.est.eMq255);
var s0wrong = (node.i0 >= s0 || node.i1 <= s0);
//console.log(maxL, leafs.length, mi);
if (s0wrong) { node.est.L = 0; continue; }
var ln = { i0: node.i0, i1: s0, bst: null, est: null, tdst: 0, left: null, right: null }; ln.bst = UPNG.quantize.stats(nimg, ln.i0, ln.i1);
ln.est = UPNG.quantize.estats(ln.bst);
var rn = { i0: s0, i1: node.i1, bst: null, est: null, tdst: 0, left: null, right: null }; rn.bst = { R: [], m: [], N: node.bst.N - ln.bst.N };
for (var i = 0; i < 16; i++) rn.bst.R[i] = node.bst.R[i] - ln.bst.R[i];
for (var i = 0; i < 4; i++) rn.bst.m[i] = node.bst.m[i] - ln.bst.m[i];
rn.est = UPNG.quantize.estats(rn.bst);
node.left = ln; node.right = rn;
leafs[mi] = ln; leafs.push(rn);
}
leafs.sort(function (a, b) { return b.bst.N - a.bst.N; });
for (var i = 0; i < leafs.length; i++) leafs[i].ind = i;
return [root, leafs];
}
UPNG.quantize.getNearest = function (nd, r, g, b, a) {
if (nd.left == null) { nd.tdst = UPNG.quantize.dist(nd.est.q, r, g, b, a); return nd; }
var planeDst = UPNG.quantize.planeDst(nd.est, r, g, b, a);
var node0 = nd.left, node1 = nd.right;
if (planeDst > 0) { node0 = nd.right; node1 = nd.left; }
var ln = UPNG.quantize.getNearest(node0, r, g, b, a);
if (ln.tdst <= planeDst * planeDst) return ln;
var rn = UPNG.quantize.getNearest(node1, r, g, b, a);
return rn.tdst < ln.tdst ? rn : ln;
}
UPNG.quantize.planeDst = function (est, r, g, b, a) { var e = est.e; return e[0] * r + e[1] * g + e[2] * b + e[3] * a - est.eMq; }
UPNG.quantize.dist = function (q, r, g, b, a) { var d0 = r - q[0], d1 = g - q[1], d2 = b - q[2], d3 = a - q[3]; return d0 * d0 + d1 * d1 + d2 * d2 + d3 * d3; }
UPNG.quantize.splitPixels = function (nimg, nimg32, i0, i1, e, eMq) {
var vecDot = UPNG.quantize.vecDot;
i1 -= 4;
var shfs = 0;
while (i0 < i1) {
while (vecDot(nimg, i0, e) <= eMq) i0 += 4;
while (vecDot(nimg, i1, e) > eMq) i1 -= 4;
if (i0 >= i1) break;
var t = nimg32[i0 >> 2]; nimg32[i0 >> 2] = nimg32[i1 >> 2]; nimg32[i1 >> 2] = t;
i0 += 4; i1 -= 4;
}
while (vecDot(nimg, i0, e) > eMq) i0 -= 4;
return i0 + 4;
}
UPNG.quantize.vecDot = function (nimg, i, e) {
return nimg[i] * e[0] + nimg[i + 1] * e[1] + nimg[i + 2] * e[2] + nimg[i + 3] * e[3];
}
UPNG.quantize.stats = function (nimg, i0, i1) {
var R = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
var m = [0, 0, 0, 0];
var N = (i1 - i0) >> 2;
for (var i = i0; i < i1; i += 4) {
var r = nimg[i] * (1 / 255), g = nimg[i + 1] * (1 / 255), b = nimg[i + 2] * (1 / 255), a = nimg[i + 3] * (1 / 255);
//var r = nimg[i], g = nimg[i+1], b = nimg[i+2], a = nimg[i+3];
m[0] += r; m[1] += g; m[2] += b; m[3] += a;
R[0] += r * r; R[1] += r * g; R[2] += r * b; R[3] += r * a;
R[5] += g * g; R[6] += g * b; R[7] += g * a;
R[10] += b * b; R[11] += b * a;
R[15] += a * a;
}
R[4] = R[1]; R[8] = R[2]; R[9] = R[6]; R[12] = R[3]; R[13] = R[7]; R[14] = R[11];
return { R: R, m: m, N: N };
}
UPNG.quantize.estats = function (stats) {
var R = stats.R, m = stats.m, N = stats.N;
// when all samples are equal, but N is large (millions), the Rj can be non-zero ( 0.0003.... - precission error)
var m0 = m[0], m1 = m[1], m2 = m[2], m3 = m[3], iN = (N == 0 ? 0 : 1 / N);
var Rj = [
R[0] - m0 * m0 * iN, R[1] - m0 * m1 * iN, R[2] - m0 * m2 * iN, R[3] - m0 * m3 * iN,
R[4] - m1 * m0 * iN, R[5] - m1 * m1 * iN, R[6] - m1 * m2 * iN, R[7] - m1 * m3 * iN,
R[8] - m2 * m0 * iN, R[9] - m2 * m1 * iN, R[10] - m2 * m2 * iN, R[11] - m2 * m3 * iN,
R[12] - m3 * m0 * iN, R[13] - m3 * m1 * iN, R[14] - m3 * m2 * iN, R[15] - m3 * m3 * iN
];
var A = Rj, M = UPNG.M4;
var b = [0.5, 0.5, 0.5, 0.5], mi = 0, tmi = 0;
if (N != 0)
for (var i = 0; i < 10; i++) {
b = M.multVec(A, b); tmi = Math.sqrt(M.dot(b, b)); b = M.sml(1 / tmi, b);
if (Math.abs(tmi - mi) < 1e-9) break; mi = tmi;
}
//b = [0,0,1,0]; mi=N;
var q = [m0 * iN, m1 * iN, m2 * iN, m3 * iN];
var eMq255 = M.dot(M.sml(255, q), b);
return {
Cov: Rj, q: q, e: b, L: mi, eMq255: eMq255, eMq: M.dot(b, q),
rgba: (((Math.round(255 * q[3]) << 24) | (Math.round(255 * q[2]) << 16) | (Math.round(255 * q[1]) << 8) | (Math.round(255 * q[0]) << 0)) >>> 0)
};
}
UPNG.M4 = {
multVec: function (m, v) {
return [
m[0] * v[0] + m[1] * v[1] + m[2] * v[2] + m[3] * v[3],
m[4] * v[0] + m[5] * v[1] + m[6] * v[2] + m[7] * v[3],
m[8] * v[0] + m[9] * v[1] + m[10] * v[2] + m[11] * v[3],
m[12] * v[0] + m[13] * v[1] + m[14] * v[2] + m[15] * v[3]
];
},
dot: function (x, y) { return x[0] * y[0] + x[1] * y[1] + x[2] * y[2] + x[3] * y[3]; },
sml: function (a, y) { return [a * y[0], a * y[1], a * y[2], a * y[3]]; }
}
UPNG.encode.concatRGBA = function (bufs, roundAlpha) {
var tlen = 0;
for (var i = 0; i < bufs.length; i++) tlen += bufs[i].byteLength;
var nimg = new Uint8Array(tlen), noff = 0;
for (var i = 0; i < bufs.length; i++) {
var img = new Uint8Array(bufs[i]), il = img.length;
for (var j = 0; j < il; j += 4) {
var r = img[j], g = img[j + 1], b = img[j + 2], a = img[j + 3];
if (roundAlpha) a = (a & 128) == 0 ? 0 : 255;
if (a == 0) r = g = b = 0;
nimg[noff + j] = r; nimg[noff + j + 1] = g; nimg[noff + j + 2] = b; nimg[noff + j + 3] = a;
}
noff += il;
}
return nimg.buffer;
}
module.exports = UPNG;

1
src/lib/ReedSolomonDecoder.js
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var GF256 = require('./GF256')
var GF256Poly = require('./GF256Poly') var GF256Poly = require('./GF256Poly')
module.exports = function ReedSolomonDecoder(field) { module.exports = function ReedSolomonDecoder(field) {

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test/node.js
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var imgDecode = require('../server')
imgDecode.decodeQRFile('./img/out.bmp').then(console.log)
imgDecode.decodeQRFile('./img/out.jpg').then(console.log,console.error)
imgDecode.decodeQRFile('./img/out.png').then(console.log,console.error)
imgDecode.decodeQRFile('./img/out.gif').then(console.log,console.error)
imgDecode.decodeQRFile('./img/dt.gif').then(console.log,console.error)
imgDecode.decodeQRFile('./img/dt1.gif').then(console.log,console.error)
//动态img
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