first commit

build/node_modules/pngjs/lib/bitmapper.js

@@ -0,0 +1,197 @@
+'use strict';
+
+var interlaceUtils = require('./interlace');
+
+var pixelBppMap = {
+  1: { // L
+    0: 0,
+    1: 0,
+    2: 0,
+    3: 0xff
+  },
+  2: { // LA
+    0: 0,
+    1: 0,
+    2: 0,
+    3: 1
+  },
+  3: { // RGB
+    0: 0,
+    1: 1,
+    2: 2,
+    3: 0xff
+  },
+  4: { // RGBA
+    0: 0,
+    1: 1,
+    2: 2,
+    3: 3
+  }
+};
+
+function bitRetriever(data, depth) {
+
+  var leftOver = [];
+  var i = 0;
+
+  function split() {
+    if (i === data.length) {
+      throw new Error('Ran out of data');
+    }
+    var byte = data[i];
+    i++;
+    var byte8, byte7, byte6, byte5, byte4, byte3, byte2, byte1;
+    switch (depth) {
+      default:
+        throw new Error('unrecognised depth');
+      case 16:
+        byte2 = data[i];
+        i++;
+        leftOver.push(((byte << 8) + byte2));
+        break;
+      case 4:
+        byte2 = byte & 0x0f;
+        byte1 = byte >> 4;
+        leftOver.push(byte1, byte2);
+        break;
+      case 2:
+        byte4 = byte & 3;
+        byte3 = byte >> 2 & 3;
+        byte2 = byte >> 4 & 3;
+        byte1 = byte >> 6 & 3;
+        leftOver.push(byte1, byte2, byte3, byte4);
+        break;
+      case 1:
+        byte8 = byte & 1;
+        byte7 = byte >> 1 & 1;
+        byte6 = byte >> 2 & 1;
+        byte5 = byte >> 3 & 1;
+        byte4 = byte >> 4 & 1;
+        byte3 = byte >> 5 & 1;
+        byte2 = byte >> 6 & 1;
+        byte1 = byte >> 7 & 1;
+        leftOver.push(byte1, byte2, byte3, byte4, byte5, byte6, byte7, byte8);
+        break;
+    }
+  }
+
+  return {
+    get: function(count) {
+      while (leftOver.length < count) {
+        split();
+      }
+      var returner = leftOver.slice(0, count);
+      leftOver = leftOver.slice(count);
+      return returner;
+    },
+    resetAfterLine: function() {
+      leftOver.length = 0;
+    },
+    end: function() {
+      if (i !== data.length) {
+        throw new Error('extra data found');
+      }
+    }
+  };
+}
+
+function mapImage8Bit(image, pxData, getPxPos, bpp, data, rawPos) { // eslint-disable-line max-params
+  var imageWidth = image.width;
+  var imageHeight = image.height;
+  var imagePass = image.index;
+  for (var y = 0; y < imageHeight; y++) {
+    for (var x = 0; x < imageWidth; x++) {
+      var pxPos = getPxPos(x, y, imagePass);
+
+      for (var i = 0; i < 4; i++) {
+        var idx = pixelBppMap[bpp][i];
+        if (idx === 0xff) {
+          pxData[pxPos + i] = 0xff;
+        } else {
+          var dataPos = idx + rawPos;
+          if (dataPos === data.length) {
+            throw new Error('Ran out of data');
+          }
+          pxData[pxPos + i] = data[dataPos];
+        }
+      }
+      rawPos += bpp; //eslint-disable-line no-param-reassign
+    }
+  }
+  return rawPos;
+}
+
+function mapImageCustomBit(image, pxData, getPxPos, bpp, bits, maxBit) { // eslint-disable-line max-params
+  var imageWidth = image.width;
+  var imageHeight = image.height;
+  var imagePass = image.index;
+  for (var y = 0; y < imageHeight; y++) {
+    for (var x = 0; x < imageWidth; x++) {
+      var pixelData = bits.get(bpp);
+      var pxPos = getPxPos(x, y, imagePass);
+
+      for (var i = 0; i < 4; i++) {
+        var idx = pixelBppMap[bpp][i];
+        pxData[pxPos + i] = idx !== 0xff ? pixelData[idx] : maxBit;
+      }
+    }
+    bits.resetAfterLine();
+  }
+}
+
+exports.dataToBitMap = function(data, bitmapInfo) {
+
+  var width = bitmapInfo.width;
+  var height = bitmapInfo.height;
+  var depth = bitmapInfo.depth;
+  var bpp = bitmapInfo.bpp;
+  var interlace = bitmapInfo.interlace;
+
+  if (depth !== 8) {
+    var bits = bitRetriever(data, depth);
+  }
+  var pxData;
+  if (depth <= 8) {
+    pxData = new Buffer(width * height * 4);
+  }
+  else {
+    pxData = new Uint16Array(width * height * 4);
+  }
+  var maxBit = Math.pow(2, depth) - 1;
+  var rawPos = 0;
+  var images;
+  var getPxPos;
+
+  if (interlace) {
+    images = interlaceUtils.getImagePasses(width, height);
+    getPxPos = interlaceUtils.getInterlaceIterator(width, height);
+  }
+  else {
+    var nonInterlacedPxPos = 0;
+    getPxPos = function() {
+      var returner = nonInterlacedPxPos;
+      nonInterlacedPxPos += 4;
+      return returner;
+    };
+    images = [{ width: width, height: height }];
+  }
+
+  for (var imageIndex = 0; imageIndex < images.length; imageIndex++) {
+    if (depth === 8) {
+      rawPos = mapImage8Bit(images[imageIndex], pxData, getPxPos, bpp, data, rawPos);
+    }
+    else {
+      mapImageCustomBit(images[imageIndex], pxData, getPxPos, bpp, bits, maxBit);
+    }
+  }
+  if (depth === 8) {
+    if (rawPos !== data.length) {
+      throw new Error('extra data found');
+    }
+  }
+  else {
+    bits.end();
+  }
+
+  return pxData;
+};

build/node_modules/pngjs/lib/bitpacker.js

@@ -0,0 +1,134 @@
+'use strict';
+
+var constants = require('./constants');
+
+module.exports = function(dataIn, width, height, options) {
+  var outHasAlpha = [constants.COLORTYPE_COLOR_ALPHA, constants.COLORTYPE_ALPHA].indexOf(options.colorType) !== -1;
+  if (options.colorType === options.inputColorType) {
+    var bigEndian = (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 no need to convert to grayscale and alpha is present/absent in both, take a fast route
+     if (options.bitDepth === 8 || (options.bitDepth === 16 && bigEndian)){
+         return dataIn;
+    }
+  }
+
+  // map to a UInt16 array if data is 16bit, fix endianness below
+  var data = options.bitDepth !== 16 ? dataIn : new Uint16Array(dataIn.buffer);
+
+  var maxValue = 255;
+  var inBpp = constants.COLORTYPE_TO_BPP_MAP[options.inputColorType];
+  if (inBpp == 4 && !options.inputHasAlpha) inBpp = 3;
+  var outBpp = constants.COLORTYPE_TO_BPP_MAP[options.colorType];
+  if (options.bitDepth === 16) {
+    maxValue = 65535;
+    outBpp *= 2;
+  }
+  var outData = new Buffer(width * height * outBpp);
+
+  var inIndex = 0;
+  var outIndex = 0;
+
+  var bgColor = options.bgColor || {};
+  if (bgColor.red === undefined) {
+    bgColor.red = maxValue;
+  }
+  if (bgColor.green === undefined) {
+    bgColor.green = maxValue;
+  }
+  if (bgColor.blue === undefined) {
+    bgColor.blue = maxValue;
+  }
+
+  function getRGBA(data, inIndex) {
+    var red, green, blue, alpha = maxValue;
+    switch (options.inputColorType) {
+      case constants.COLORTYPE_COLOR_ALPHA:
+        alpha = data[inIndex + 3];
+        red = data[inIndex];
+        green = data[inIndex+1];
+        blue = data[inIndex+2];
+        break;
+      case constants.COLORTYPE_COLOR:
+        red = data[inIndex];
+        green = data[inIndex+1];
+        blue = data[inIndex+2];
+        break;
+      case constants.COLORTYPE_ALPHA:
+        alpha = data[inIndex + 1];
+        red = data[inIndex];
+        green = red;
+        blue = red;
+        break;
+      case constants.COLORTYPE_GRAYSCALE:
+        red = data[inIndex];
+        green = red;
+        blue = red;
+        break;
+      default:
+        throw new Error('input color type:' + options.inputColorType + ' is not supported at present');
+    }
+
+    if (options.inputHasAlpha) {
+      if (!outHasAlpha) {
+        alpha /= maxValue;
+        red = Math.min(Math.max(Math.round((1 - alpha) * bgColor.red + alpha * red), 0), maxValue);
+        green = Math.min(Math.max(Math.round((1 - alpha) * bgColor.green + alpha * green), 0), maxValue);
+        blue = Math.min(Math.max(Math.round((1 - alpha) * bgColor.blue + alpha * blue), 0), maxValue);
+      }
+    }
+    return {red: red, green: green, blue: blue, alpha: alpha};
+  }
+
+  for (var y = 0; y < height; y++) {
+    for (var x = 0; x < width; x++) {
+      var rgba = getRGBA(data, inIndex);
+
+      switch (options.colorType) {
+        case constants.COLORTYPE_COLOR_ALPHA:
+        case constants.COLORTYPE_COLOR:
+          if (options.bitDepth === 8) {
+            outData[outIndex] = rgba.red;
+            outData[outIndex + 1] = rgba.green;
+            outData[outIndex + 2] = rgba.blue;
+            if (outHasAlpha) {
+              outData[outIndex + 3] = rgba.alpha;
+            }
+          } else {
+            outData.writeUInt16BE(rgba.red, outIndex);
+            outData.writeUInt16BE(rgba.green, outIndex + 2);
+            outData.writeUInt16BE(rgba.blue, outIndex + 4);
+            if (outHasAlpha) {
+              outData.writeUInt16BE(rgba.alpha, outIndex + 6);
+            }
+          }
+          break;
+        case constants.COLORTYPE_ALPHA:
+        case constants.COLORTYPE_GRAYSCALE:
+          // Convert to grayscale and alpha
+          var grayscale = (rgba.red + rgba.green + rgba.blue) / 3;
+          if (options.bitDepth === 8) {
+            outData[outIndex] = grayscale;
+            if (outHasAlpha) {
+              outData[outIndex + 1] = rgba.alpha;
+            }
+          } else {
+            outData.writeUInt16BE(grayscale, outIndex);
+            if (outHasAlpha) {
+              outData.writeUInt16BE(rgba.alpha, outIndex + 2);
+            }
+          }
+          break;
+      }
+
+      inIndex += inBpp;
+      outIndex += outBpp;
+    }
+  }
+
+  return outData;
+};

build/node_modules/pngjs/lib/chunkstream.js

@@ -0,0 +1,209 @@
+'use strict';
+
+
+var util = require('util');
+var Stream = require('stream');
+
+
+var ChunkStream = module.exports = function() {
+  Stream.call(this);
+
+  this._buffers = [];
+  this._buffered = 0;
+
+  this._reads = [];
+  this._paused = false;
+
+  this._encoding = 'utf8';
+  this.writable = true;
+};
+util.inherits(ChunkStream, Stream);
+
+
+ChunkStream.prototype.read = function(length, callback) {
+
+  this._reads.push({
+    length: Math.abs(length),  // if length < 0 then at most this length
+    allowLess: length < 0,
+    func: callback
+  });
+
+  process.nextTick(function() {
+    this._process();
+
+    // its paused and there is not enought data then ask for more
+    if (this._paused && this._reads.length > 0) {
+      this._paused = false;
+
+      this.emit('drain');
+    }
+  }.bind(this));
+};
+
+ChunkStream.prototype.write = function(data, encoding) {
+
+  if (!this.writable) {
+    this.emit('error', new Error('Stream not writable'));
+    return false;
+  }
+
+  var dataBuffer;
+  if (Buffer.isBuffer(data)) {
+    dataBuffer = data;
+  }
+  else {
+    dataBuffer = new Buffer(data, encoding || this._encoding);
+  }
+
+  this._buffers.push(dataBuffer);
+  this._buffered += dataBuffer.length;
+
+  this._process();
+
+  // ok if there are no more read requests
+  if (this._reads && this._reads.length === 0) {
+    this._paused = true;
+  }
+
+  return this.writable && !this._paused;
+};
+
+ChunkStream.prototype.end = function(data, encoding) {
+
+  if (data) {
+    this.write(data, encoding);
+  }
+
+  this.writable = false;
+
+  // already destroyed
+  if (!this._buffers) {
+    return;
+  }
+
+  // enqueue or handle end
+  if (this._buffers.length === 0) {
+    this._end();
+  }
+  else {
+    this._buffers.push(null);
+    this._process();
+  }
+};
+
+ChunkStream.prototype.destroySoon = ChunkStream.prototype.end;
+
+ChunkStream.prototype._end = function() {
+
+  if (this._reads.length > 0) {
+    this.emit('error',
+      new Error('There are some read requests waiting on finished stream')
+    );
+  }
+
+  this.destroy();
+};
+
+ChunkStream.prototype.destroy = function() {
+
+  if (!this._buffers) {
+    return;
+  }
+
+  this.writable = false;
+  this._reads = null;
+  this._buffers = null;
+
+  this.emit('close');
+};
+
+ChunkStream.prototype._processReadAllowingLess = function(read) {
+  // ok there is any data so that we can satisfy this request
+  this._reads.shift(); // == read
+
+  // first we need to peek into first buffer
+  var smallerBuf = this._buffers[0];
+
+  // ok there is more data than we need
+  if (smallerBuf.length > read.length) {
+
+    this._buffered -= read.length;
+    this._buffers[0] = smallerBuf.slice(read.length);
+
+    read.func.call(this, smallerBuf.slice(0, read.length));
+
+  }
+  else {
+    // ok this is less than maximum length so use it all
+    this._buffered -= smallerBuf.length;
+    this._buffers.shift(); // == smallerBuf
+
+    read.func.call(this, smallerBuf);
+  }
+};
+
+ChunkStream.prototype._processRead = function(read) {
+  this._reads.shift(); // == read
+
+  var pos = 0;
+  var count = 0;
+  var data = new Buffer(read.length);
+
+  // create buffer for all data
+  while (pos < read.length) {
+
+    var buf = this._buffers[count++];
+    var len = Math.min(buf.length, read.length - pos);
+
+    buf.copy(data, pos, 0, len);
+    pos += len;
+
+    // last buffer wasn't used all so just slice it and leave
+    if (len !== buf.length) {
+      this._buffers[--count] = buf.slice(len);
+    }
+  }
+
+  // remove all used buffers
+  if (count > 0) {
+    this._buffers.splice(0, count);
+  }
+
+  this._buffered -= read.length;
+
+  read.func.call(this, data);
+};
+
+ChunkStream.prototype._process = function() {
+
+  try {
+    // as long as there is any data and read requests
+    while (this._buffered > 0 && this._reads && this._reads.length > 0) {
+
+      var read = this._reads[0];
+
+      // read any data (but no more than length)
+      if (read.allowLess) {
+        this._processReadAllowingLess(read);
+
+      }
+      else if (this._buffered >= read.length) {
+        // ok we can meet some expectations
+
+        this._processRead(read);
+      }
+      else {
+        // not enought data to satisfy first request in queue
+        // so we need to wait for more
+        break;
+      }
+    }
+
+    if (this._buffers && this._buffers.length > 0 && this._buffers[0] === null) {
+      this._end();
+    }
+  }
+  catch (ex) {
+    this.emit('error', ex);
+  }
+};

build/node_modules/pngjs/lib/constants.js

@@ -0,0 +1,34 @@
+'use strict';
+
+
+module.exports = {
+
+  PNG_SIGNATURE: [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a],
+
+  TYPE_IHDR: 0x49484452,
+  TYPE_IEND: 0x49454e44,
+  TYPE_IDAT: 0x49444154,
+  TYPE_PLTE: 0x504c5445,
+  TYPE_tRNS: 0x74524e53, // eslint-disable-line camelcase
+  TYPE_gAMA: 0x67414d41, // eslint-disable-line camelcase
+
+  // color-type bits
+  COLORTYPE_GRAYSCALE: 0,
+  COLORTYPE_PALETTE: 1,
+  COLORTYPE_COLOR: 2,
+  COLORTYPE_ALPHA: 4, // e.g. grayscale and alpha
+
+  // color-type combinations
+  COLORTYPE_PALETTE_COLOR: 3,
+  COLORTYPE_COLOR_ALPHA: 6,
+
+  COLORTYPE_TO_BPP_MAP: {
+    0: 1,
+    2: 3,
+    3: 1,
+    4: 2,
+    6: 4
+  },
+
+  GAMMA_DIVISION: 100000
+};

build/node_modules/pngjs/lib/crc.js

@@ -0,0 +1,44 @@
+'use strict';
+
+var crcTable = [];
+
+(function() {
+  for (var i = 0; i < 256; i++) {
+    var currentCrc = i;
+    for (var j = 0; j < 8; j++) {
+      if (currentCrc & 1) {
+        currentCrc = 0xedb88320 ^ (currentCrc >>> 1);
+      }
+      else {
+        currentCrc = currentCrc >>> 1;
+      }
+    }
+    crcTable[i] = currentCrc;
+  }
+}());
+
+var CrcCalculator = module.exports = function() {
+  this._crc = -1;
+};
+
+CrcCalculator.prototype.write = function(data) {
+
+  for (var i = 0; i < data.length; i++) {
+    this._crc = crcTable[(this._crc ^ data[i]) & 0xff] ^ (this._crc >>> 8);
+  }
+  return true;
+};
+
+CrcCalculator.prototype.crc32 = function() {
+  return this._crc ^ -1;
+};
+
+
+CrcCalculator.crc32 = function(buf) {
+
+  var crc = -1;
+  for (var i = 0; i < buf.length; i++) {
+    crc = crcTable[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
+  }
+  return crc ^ -1;
+};

build/node_modules/pngjs/lib/filter-pack.js

@@ -0,0 +1,185 @@
+'use strict';
+
+var paethPredictor = require('./paeth-predictor');
+
+function filterNone(pxData, pxPos, byteWidth, rawData, rawPos) {
+  pxData.copy(rawData, rawPos, pxPos, pxPos + byteWidth);
+}
+
+function filterSumNone(pxData, pxPos, byteWidth) {
+
+  var sum = 0;
+  var length = pxPos + byteWidth;
+
+  for (var i = pxPos; i < length; i++) {
+    sum += Math.abs(pxData[i]);
+  }
+  return sum;
+}
+
+function filterSub(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
+
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var val = pxData[pxPos + x] - left;
+
+    rawData[rawPos + x] = val;
+  }
+}
+
+function filterSumSub(pxData, pxPos, byteWidth, bpp) {
+
+  var sum = 0;
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var val = pxData[pxPos + x] - left;
+
+    sum += Math.abs(val);
+  }
+
+  return sum;
+}
+
+function filterUp(pxData, pxPos, byteWidth, rawData, rawPos) {
+
+  for (var x = 0; x < byteWidth; x++) {
+
+    var up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
+    var val = pxData[pxPos + x] - up;
+
+    rawData[rawPos + x] = val;
+  }
+}
+
+function filterSumUp(pxData, pxPos, byteWidth) {
+
+  var sum = 0;
+  var length = pxPos + byteWidth;
+  for (var x = pxPos; x < length; x++) {
+
+    var up = pxPos > 0 ? pxData[x - byteWidth] : 0;
+    var val = pxData[x] - up;
+
+    sum += Math.abs(val);
+  }
+
+  return sum;
+}
+
+function filterAvg(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
+
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
+    var val = pxData[pxPos + x] - ((left + up) >> 1);
+
+    rawData[rawPos + x] = val;
+  }
+}
+
+function filterSumAvg(pxData, pxPos, byteWidth, bpp) {
+
+  var sum = 0;
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
+    var val = pxData[pxPos + x] - ((left + up) >> 1);
+
+    sum += Math.abs(val);
+  }
+
+  return sum;
+}
+
+function filterPaeth(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
+
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
+    var upleft = pxPos > 0 && x >= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
+    var val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
+
+    rawData[rawPos + x] = val;
+  }
+}
+
+function filterSumPaeth(pxData, pxPos, byteWidth, bpp) {
+  var sum = 0;
+  for (var x = 0; x < byteWidth; x++) {
+
+    var left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
+    var up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
+    var upleft = pxPos > 0 && x >= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
+    var val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
+
+    sum += Math.abs(val);
+  }
+
+  return sum;
+}
+
+var filters = {
+  0: filterNone,
+  1: filterSub,
+  2: filterUp,
+  3: filterAvg,
+  4: filterPaeth
+};
+
+var filterSums = {
+  0: filterSumNone,
+  1: filterSumSub,
+  2: filterSumUp,
+  3: filterSumAvg,
+  4: filterSumPaeth
+};
+
+module.exports = function(pxData, width, height, options, bpp) {
+
+  var filterTypes;
+  if (!('filterType' in options) || options.filterType === -1) {
+    filterTypes = [0, 1, 2, 3, 4];
+  }
+  else if (typeof options.filterType === 'number') {
+    filterTypes = [options.filterType];
+  }
+  else {
+    throw new Error('unrecognised filter types');
+  }
+
+  if (options.bitDepth === 16) bpp *= 2;
+  var byteWidth = width * bpp;
+  var rawPos = 0;
+  var pxPos = 0;
+  var rawData = new Buffer((byteWidth + 1) * height);
+
+  var sel = filterTypes[0];
+
+  for (var y = 0; y < height; y++) {
+
+    if (filterTypes.length > 1) {
+      // find best filter for this line (with lowest sum of values)
+      var min = Infinity;
+
+      for (var i = 0; i < filterTypes.length; i++) {
+        var sum = filterSums[filterTypes[i]](pxData, pxPos, byteWidth, bpp);
+        if (sum < min) {
+          sel = filterTypes[i];
+          min = sum;
+        }
+      }
+    }
+
+    rawData[rawPos] = sel;
+    rawPos++;
+    filters[sel](pxData, pxPos, byteWidth, rawData, rawPos, bpp);
+    rawPos += byteWidth;
+    pxPos += byteWidth;
+  }
+  return rawData;
+};

build/node_modules/pngjs/lib/filter-parse-async.js

@@ -0,0 +1,25 @@
+'use strict';
+
+var util = require('util');
+var ChunkStream = require('./chunkstream');
+var Filter = require('./filter-parse');
+
+
+var FilterAsync = module.exports = function(bitmapInfo) {
+  ChunkStream.call(this);
+
+  var buffers = [];
+  var that = this;
+  this._filter = new Filter(bitmapInfo, {
+    read: this.read.bind(this),
+    write: function(buffer) {
+      buffers.push(buffer);
+    },
+    complete: function() {
+      that.emit('complete', Buffer.concat(buffers));
+    }
+  });
+
+  this._filter.start();
+};
+util.inherits(FilterAsync, ChunkStream);

build/node_modules/pngjs/lib/filter-parse-sync.js

@@ -0,0 +1,24 @@
+'use strict';
+
+var SyncReader = require('./sync-reader');
+var Filter = require('./filter-parse');
+
+
+exports.process = function(inBuffer, bitmapInfo) {
+
+  var outBuffers = [];
+  var reader = new SyncReader(inBuffer);
+  var filter = new Filter(bitmapInfo, {
+    read: reader.read.bind(reader),
+    write: function(bufferPart) {
+      outBuffers.push(bufferPart);
+    },
+    complete: function() {
+    }
+  });
+
+  filter.start();
+  reader.process();
+
+  return Buffer.concat(outBuffers);
+};

build/node_modules/pngjs/lib/filter-parse.js

@@ -0,0 +1,171 @@
+'use strict';
+
+var interlaceUtils = require('./interlace');
+var paethPredictor = require('./paeth-predictor');
+
+function getByteWidth(width, bpp, depth) {
+  var byteWidth = width * bpp;
+  if (depth !== 8) {
+    byteWidth = Math.ceil(byteWidth / (8 / depth));
+  }
+  return byteWidth;
+}
+
+var Filter = module.exports = function(bitmapInfo, dependencies) {
+
+  var width = bitmapInfo.width;
+  var height = bitmapInfo.height;
+  var interlace = bitmapInfo.interlace;
+  var bpp = bitmapInfo.bpp;
+  var depth = bitmapInfo.depth;
+
+  this.read = dependencies.read;
+  this.write = dependencies.write;
+  this.complete = dependencies.complete;
+
+  this._imageIndex = 0;
+  this._images = [];
+  if (interlace) {
+    var passes = interlaceUtils.getImagePasses(width, height);
+    for (var i = 0; i < passes.length; i++) {
+      this._images.push({
+        byteWidth: getByteWidth(passes[i].width, bpp, depth),
+        height: passes[i].height,
+        lineIndex: 0
+      });
+    }
+  }
+  else {
+    this._images.push({
+      byteWidth: getByteWidth(width, bpp, depth),
+      height: height,
+      lineIndex: 0
+    });
+  }
+
+  // when filtering the line we look at the pixel to the left
+  // the spec also says it is done on a byte level regardless of the number of pixels
+  // so if the depth is byte compatible (8 or 16) we subtract the bpp in order to compare back
+  // a pixel rather than just a different byte part. However if we are sub byte, we ignore.
+  if (depth === 8) {
+    this._xComparison = bpp;
+  }
+  else if (depth === 16) {
+    this._xComparison = bpp * 2;
+  }
+  else {
+    this._xComparison = 1;
+  }
+};
+
+Filter.prototype.start = function() {
+  this.read(this._images[this._imageIndex].byteWidth + 1, this._reverseFilterLine.bind(this));
+};
+
+Filter.prototype._unFilterType1 = function(rawData, unfilteredLine, byteWidth) {
+
+  var xComparison = this._xComparison;
+  var xBiggerThan = xComparison - 1;
+
+  for (var x = 0; x < byteWidth; x++) {
+    var rawByte = rawData[1 + x];
+    var f1Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
+    unfilteredLine[x] = rawByte + f1Left;
+  }
+};
+
+Filter.prototype._unFilterType2 = function(rawData, unfilteredLine, byteWidth) {
+
+  var lastLine = this._lastLine;
+
+  for (var x = 0; x < byteWidth; x++) {
+    var rawByte = rawData[1 + x];
+    var f2Up = lastLine ? lastLine[x] : 0;
+    unfilteredLine[x] = rawByte + f2Up;
+  }
+};
+
+Filter.prototype._unFilterType3 = function(rawData, unfilteredLine, byteWidth) {
+
+  var xComparison = this._xComparison;
+  var xBiggerThan = xComparison - 1;
+  var lastLine = this._lastLine;
+
+  for (var x = 0; x < byteWidth; x++) {
+    var rawByte = rawData[1 + x];
+    var f3Up = lastLine ? lastLine[x] : 0;
+    var f3Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
+    var f3Add = Math.floor((f3Left + f3Up) / 2);
+    unfilteredLine[x] = rawByte + f3Add;
+  }
+};
+
+Filter.prototype._unFilterType4 = function(rawData, unfilteredLine, byteWidth) {
+
+  var xComparison = this._xComparison;
+  var xBiggerThan = xComparison - 1;
+  var lastLine = this._lastLine;
+
+  for (var x = 0; x < byteWidth; x++) {
+    var rawByte = rawData[1 + x];
+    var f4Up = lastLine ? lastLine[x] : 0;
+    var f4Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
+    var f4UpLeft = x > xBiggerThan && lastLine ? lastLine[x - xComparison] : 0;
+    var f4Add = paethPredictor(f4Left, f4Up, f4UpLeft);
+    unfilteredLine[x] = rawByte + f4Add;
+  }
+};
+
+Filter.prototype._reverseFilterLine = function(rawData) {
+
+  var filter = rawData[0];
+  var unfilteredLine;
+  var currentImage = this._images[this._imageIndex];
+  var byteWidth = currentImage.byteWidth;
+
+  if (filter === 0) {
+    unfilteredLine = rawData.slice(1, byteWidth + 1);
+  }
+  else {
+
+    unfilteredLine = new Buffer(byteWidth);
+
+    switch (filter) {
+      case 1:
+        this._unFilterType1(rawData, unfilteredLine, byteWidth);
+        break;
+      case 2:
+        this._unFilterType2(rawData, unfilteredLine, byteWidth);
+        break;
+      case 3:
+        this._unFilterType3(rawData, unfilteredLine, byteWidth);
+        break;
+      case 4:
+        this._unFilterType4(rawData, unfilteredLine, byteWidth);
+        break;
+      default:
+        throw new Error('Unrecognised filter type - ' + filter);
+    }
+  }
+
+  this.write(unfilteredLine);
+
+  currentImage.lineIndex++;
+  if (currentImage.lineIndex >= currentImage.height) {
+    this._lastLine = null;
+    this._imageIndex++;
+    currentImage = this._images[this._imageIndex];
+  }
+  else {
+    this._lastLine = unfilteredLine;
+  }
+
+  if (currentImage) {
+    // read, using the byte width that may be from the new current image
+    this.read(currentImage.byteWidth + 1, this._reverseFilterLine.bind(this));
+  }
+  else {
+    this._lastLine = null;
+    this.complete();
+  }
+};

build/node_modules/pngjs/lib/format-normaliser.js

@@ -0,0 +1,89 @@
+'use strict';
+
+function dePalette(indata, outdata, width, height, palette) {
+  var pxPos = 0;
+  // use values from palette
+  for (var y = 0; y < height; y++) {
+    for (var x = 0; x < width; x++) {
+      var color = palette[indata[pxPos]];
+
+      if (!color) {
+        throw new Error('index ' + indata[pxPos] + ' not in palette');
+      }
+
+      for (var i = 0; i < 4; i++) {
+        outdata[pxPos + i] = color[i];
+      }
+      pxPos += 4;
+    }
+  }
+}
+
+function replaceTransparentColor(indata, outdata, width, height, transColor) {
+  var pxPos = 0;
+  for (var y = 0; y < height; y++) {
+    for (var x = 0; x < width; x++) {
+      var makeTrans = false;
+
+      if (transColor.length === 1) {
+        if (transColor[0] === indata[pxPos]) {
+          makeTrans = true;
+        }
+      }
+      else if (transColor[0] === indata[pxPos] && transColor[1] === indata[pxPos + 1] && transColor[2] === indata[pxPos + 2]) {
+        makeTrans = true;
+      }
+      if (makeTrans) {
+        for (var i = 0; i < 4; i++) {
+          outdata[pxPos + i] = 0;
+        }
+      }
+      pxPos += 4;
+    }
+  }
+}
+
+function scaleDepth(indata, outdata, width, height, depth) {
+  var maxOutSample = 255;
+  var maxInSample = Math.pow(2, depth) - 1;
+  var pxPos = 0;
+
+  for (var y = 0; y < height; y++) {
+    for (var x = 0; x < width; x++) {
+      for (var i = 0; i < 4; i++) {
+        outdata[pxPos + i] = Math.floor((indata[pxPos + i] * maxOutSample) / maxInSample + 0.5);
+      }
+      pxPos += 4;
+    }
+  }
+}
+
+module.exports = function(indata, imageData) {
+
+  var depth = imageData.depth;
+  var width = imageData.width;
+  var height = imageData.height;
+  var colorType = imageData.colorType;
+  var transColor = imageData.transColor;
+  var palette = imageData.palette;
+
+  var outdata = indata; // only different for 16 bits
+
+  if (colorType === 3) { // paletted
+    dePalette(indata, outdata, width, height, palette);
+  }
+  else {
+    if (transColor) {
+      replaceTransparentColor(indata, outdata, width, height, transColor);
+    }
+    // if it needs scaling
+    if (depth !== 8) {
+      // if we need to change the buffer size
+      if (depth === 16) {
+        outdata = new Buffer(width * height * 4);
+      }
+      scaleDepth(indata, outdata, width, height, depth);
+    }
+  }
+  return outdata;
+};

build/node_modules/pngjs/lib/interlace.js

@@ -0,0 +1,87 @@
+'use strict';
+
+// Adam 7
+//   0 1 2 3 4 5 6 7
+// 0 x 6 4 6 x 6 4 6
+// 1 7 7 7 7 7 7 7 7
+// 2 5 6 5 6 5 6 5 6
+// 3 7 7 7 7 7 7 7 7
+// 4 3 6 4 6 3 6 4 6
+// 5 7 7 7 7 7 7 7 7
+// 6 5 6 5 6 5 6 5 6
+// 7 7 7 7 7 7 7 7 7
+
+
+var imagePasses = [
+  { // pass 1 - 1px
+    x: [0],
+    y: [0]
+  },
+  { // pass 2 - 1px
+    x: [4],
+    y: [0]
+  },
+  { // pass 3 - 2px
+    x: [0, 4],
+    y: [4]
+  },
+  { // pass 4 - 4px
+    x: [2, 6],
+    y: [0, 4]
+  },
+  { // pass 5 - 8px
+    x: [0, 2, 4, 6],
+    y: [2, 6]
+  },
+  { // pass 6 - 16px
+    x: [1, 3, 5, 7],
+    y: [0, 2, 4, 6]
+  },
+  { // pass 7 - 32px
+    x: [0, 1, 2, 3, 4, 5, 6, 7],
+    y: [1, 3, 5, 7]
+  }
+];
+
+exports.getImagePasses = function(width, height) {
+  var images = [];
+  var xLeftOver = width % 8;
+  var yLeftOver = height % 8;
+  var xRepeats = (width - xLeftOver) / 8;
+  var yRepeats = (height - yLeftOver) / 8;
+  for (var i = 0; i < imagePasses.length; i++) {
+    var pass = imagePasses[i];
+    var passWidth = xRepeats * pass.x.length;
+    var passHeight = yRepeats * pass.y.length;
+    for (var j = 0; j < pass.x.length; j++) {
+      if (pass.x[j] < xLeftOver) {
+        passWidth++;
+      }
+      else {
+        break;
+      }
+    }
+    for (j = 0; j < pass.y.length; j++) {
+      if (pass.y[j] < yLeftOver) {
+        passHeight++;
+      }
+      else {
+        break;
+      }
+    }
+    if (passWidth > 0 && passHeight > 0) {
+      images.push({ width: passWidth, height: passHeight, index: i });
+    }
+  }
+  return images;
+};
+
+exports.getInterlaceIterator = function(width) {
+  return function(x, y, pass) {
+    var outerXLeftOver = x % imagePasses[pass].x.length;
+    var outerX = (((x - outerXLeftOver) / imagePasses[pass].x.length) * 8) + imagePasses[pass].x[outerXLeftOver];
+    var outerYLeftOver = y % imagePasses[pass].y.length;
+    var outerY = (((y - outerYLeftOver) / imagePasses[pass].y.length) * 8) + imagePasses[pass].y[outerYLeftOver];
+    return (outerX * 4) + (outerY * width * 4);
+  };
+};

build/node_modules/pngjs/lib/packer-async.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var util = require('util');
+var Stream = require('stream');
+var constants = require('./constants');
+var Packer = require('./packer');
+
+var PackerAsync = module.exports = function(opt) {
+  Stream.call(this);
+
+  var options = opt || {};
+
+  this._packer = new Packer(options);
+  this._deflate = this._packer.createDeflate();
+
+  this.readable = true;
+};
+util.inherits(PackerAsync, Stream);
+
+
+PackerAsync.prototype.pack = function(data, width, height, gamma) {
+  // Signature
+  this.emit('data', new Buffer(constants.PNG_SIGNATURE));
+  this.emit('data', this._packer.packIHDR(width, height));
+
+  if (gamma) {
+    this.emit('data', this._packer.packGAMA(gamma));
+  }
+
+  var filteredData = this._packer.filterData(data, width, height);
+
+  // compress it
+  this._deflate.on('error', this.emit.bind(this, 'error'));
+
+  this._deflate.on('data', function(compressedData) {
+    this.emit('data', this._packer.packIDAT(compressedData));
+  }.bind(this));
+
+  this._deflate.on('end', function() {
+    this.emit('data', this._packer.packIEND());
+    this.emit('end');
+  }.bind(this));
+
+  this._deflate.end(filteredData);
+};

build/node_modules/pngjs/lib/packer-sync.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var hasSyncZlib = true;
+var zlib = require('zlib');
+var constants = require('./constants');
+var Packer = require('./packer');
+
+module.exports = function(metaData, opt) {
+
+  if (!hasSyncZlib) {
+    throw new Error('To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0');
+  }
+
+  var options = opt || {};
+
+  var packer = new Packer(options);
+
+  var chunks = [];
+
+  // Signature
+  chunks.push(new Buffer(constants.PNG_SIGNATURE));
+
+  // Header
+  chunks.push(packer.packIHDR(metaData.width, metaData.height));
+
+  if (metaData.gamma) {
+    chunks.push(packer.packGAMA(metaData.gamma));
+  }
+
+  var filteredData = packer.filterData(metaData.data, metaData.width, metaData.height);
+
+  // compress it
+  var compressedData = zlib.deflateSync(filteredData, packer.getDeflateOptions());
+  filteredData = null;
+
+  if (!compressedData || !compressedData.length) {
+    throw new Error('bad png - invalid compressed data response');
+  }
+  chunks.push(packer.packIDAT(compressedData));
+
+  // End
+  chunks.push(packer.packIEND());
+
+  return Buffer.concat(chunks);
+};

build/node_modules/pngjs/lib/packer.js

@@ -0,0 +1,107 @@
+'use strict';
+
+var constants = require('./constants');
+var CrcStream = require('./crc');
+var bitPacker = require('./bitpacker');
+var filter = require('./filter-pack');
+var zlib = require('zlib');
+
+var Packer = module.exports = function(options) {
+  this._options = options;
+
+  options.deflateChunkSize = options.deflateChunkSize || 32 * 1024;
+  options.deflateLevel = options.deflateLevel != null ? options.deflateLevel : 9;
+  options.deflateStrategy = options.deflateStrategy != null ? options.deflateStrategy : 3;
+  options.inputHasAlpha = options.inputHasAlpha != null ? options.inputHasAlpha : true;
+  options.deflateFactory = options.deflateFactory || zlib.createDeflate;
+  options.bitDepth = options.bitDepth || 8;
+  // This is outputColorType
+  options.colorType = (typeof options.colorType === 'number') ? options.colorType : constants.COLORTYPE_COLOR_ALPHA;
+  options.inputColorType = (typeof options.inputColorType === 'number') ? options.inputColorType : constants.COLORTYPE_COLOR_ALPHA;
+
+  if ([
+    constants.COLORTYPE_GRAYSCALE,
+    constants.COLORTYPE_COLOR,
+    constants.COLORTYPE_COLOR_ALPHA,
+    constants.COLORTYPE_ALPHA
+  ].indexOf(options.colorType) === -1) {
+    throw new Error('option color type:' + options.colorType + ' is not supported at present');
+  }
+  if ([
+    constants.COLORTYPE_GRAYSCALE,
+    constants.COLORTYPE_COLOR,
+    constants.COLORTYPE_COLOR_ALPHA,
+    constants.COLORTYPE_ALPHA
+  ].indexOf(options.inputColorType) === -1) {
+    throw new Error('option input color type:' + options.inputColorType + ' is not supported at present');
+  }
+  if (options.bitDepth !== 8 && options.bitDepth !== 16) {
+    throw new Error('option bit depth:' + options.bitDepth + ' is not supported at present');
+  }
+};
+
+Packer.prototype.getDeflateOptions = function() {
+  return {
+    chunkSize: this._options.deflateChunkSize,
+    level: this._options.deflateLevel,
+    strategy: this._options.deflateStrategy
+  };
+};
+
+Packer.prototype.createDeflate = function() {
+  return this._options.deflateFactory(this.getDeflateOptions());
+};
+
+Packer.prototype.filterData = function(data, width, height) {
+  // convert to correct format for filtering (e.g. right bpp and bit depth)
+  var packedData = bitPacker(data, width, height, this._options);
+
+  // filter pixel data
+  var bpp = constants.COLORTYPE_TO_BPP_MAP[this._options.colorType];
+  var filteredData = filter(packedData, width, height, this._options, bpp);
+  return filteredData;
+};
+
+Packer.prototype._packChunk = function(type, data) {
+
+  var len = (data ? data.length : 0);
+  var buf = new Buffer(len + 12);
+
+  buf.writeUInt32BE(len, 0);
+  buf.writeUInt32BE(type, 4);
+
+  if (data) {
+    data.copy(buf, 8);
+  }
+
+  buf.writeInt32BE(CrcStream.crc32(buf.slice(4, buf.length - 4)), buf.length - 4);
+  return buf;
+};
+
+Packer.prototype.packGAMA = function(gamma) {
+  var buf = new Buffer(4);
+  buf.writeUInt32BE(Math.floor(gamma * constants.GAMMA_DIVISION), 0);
+  return this._packChunk(constants.TYPE_gAMA, buf);
+};
+
+Packer.prototype.packIHDR = function(width, height) {
+
+  var buf = new Buffer(13);
+  buf.writeUInt32BE(width, 0);
+  buf.writeUInt32BE(height, 4);
+  buf[8] = this._options.bitDepth; // Bit depth
+  buf[9] = this._options.colorType; // colorType
+  buf[10] = 0; // compression
+  buf[11] = 0; // filter
+  buf[12] = 0; // interlace
+
+  return this._packChunk(constants.TYPE_IHDR, buf);
+};
+
+Packer.prototype.packIDAT = function(data) {
+  return this._packChunk(constants.TYPE_IDAT, data);
+};
+
+Packer.prototype.packIEND = function() {
+  return this._packChunk(constants.TYPE_IEND, null);
+};

build/node_modules/pngjs/lib/paeth-predictor.js

@@ -0,0 +1,17 @@
+'use strict';
+
+module.exports = function paethPredictor(left, above, upLeft) {
+
+  var paeth = left + above - upLeft;
+  var pLeft = Math.abs(paeth - left);
+  var pAbove = Math.abs(paeth - above);
+  var pUpLeft = Math.abs(paeth - upLeft);
+
+  if (pLeft <= pAbove && pLeft <= pUpLeft) {
+    return left;
+  }
+  if (pAbove <= pUpLeft) {
+    return above;
+  }
+  return upLeft;
+};

build/node_modules/pngjs/lib/parser-async.js

@@ -0,0 +1,146 @@
+'use strict';
+
+var util = require('util');
+var zlib = require('zlib');
+var ChunkStream = require('./chunkstream');
+var FilterAsync = require('./filter-parse-async');
+var Parser = require('./parser');
+var bitmapper = require('./bitmapper');
+var formatNormaliser = require('./format-normaliser');
+
+var ParserAsync = module.exports = function(options) {
+  ChunkStream.call(this);
+
+  this._parser = new Parser(options, {
+    read: this.read.bind(this),
+    error: this._handleError.bind(this),
+    metadata: this._handleMetaData.bind(this),
+    gamma: this.emit.bind(this, 'gamma'),
+    palette: this._handlePalette.bind(this),
+    transColor: this._handleTransColor.bind(this),
+    finished: this._finished.bind(this),
+    inflateData: this._inflateData.bind(this)
+  });
+  this._options = options;
+  this.writable = true;
+
+  this._parser.start();
+};
+util.inherits(ParserAsync, ChunkStream);
+
+
+ParserAsync.prototype._handleError = function(err) {
+
+  this.emit('error', err);
+
+  this.writable = false;
+
+  this.destroy();
+
+  if (this._inflate && this._inflate.destroy) {
+    this._inflate.destroy();
+  }
+
+  this.errord = true;
+};
+
+ParserAsync.prototype._inflateData = function(data) {
+  if (!this._inflate) {
+    if (this._bitmapInfo.interlace) {
+      this._inflate = zlib.createInflate();
+
+      this._inflate.on('error', this.emit.bind(this, 'error'));
+      this._filter.on('complete', this._complete.bind(this));
+
+      this._inflate.pipe(this._filter);
+    } else {
+      var rowSize = ((this._bitmapInfo.width * this._bitmapInfo.bpp * this._bitmapInfo.depth + 7) >> 3) + 1;
+      var imageSize = rowSize * this._bitmapInfo.height;
+      var chunkSize = Math.max(imageSize, zlib.Z_MIN_CHUNK);
+      
+      this._inflate = zlib.createInflate({ chunkSize: chunkSize });
+      var leftToInflate = imageSize;
+
+      var emitError = this.emit.bind(this, 'error');
+      this._inflate.on('error', function(err) {
+        if (!leftToInflate) {
+          return;
+        }
+
+        emitError(err);
+      });
+      this._filter.on('complete', this._complete.bind(this));
+
+      var filterWrite = this._filter.write.bind(this._filter);
+      this._inflate.on('data', function(chunk) {
+        if (!leftToInflate) {
+          return;
+        }
+
+        if (chunk.length > leftToInflate) {
+          chunk = chunk.slice(0, leftToInflate);
+        }
+
+        leftToInflate -= chunk.length;
+
+        filterWrite(chunk);
+      });
+
+      this._inflate.on('end', this._filter.end.bind(this._filter));
+    }
+  }
+  this._inflate.write(data);
+};
+
+ParserAsync.prototype._handleMetaData = function(metaData) {
+
+  this.emit('metadata', metaData);
+
+  this._bitmapInfo = Object.create(metaData);
+
+  this._filter = new FilterAsync(this._bitmapInfo);
+};
+
+ParserAsync.prototype._handleTransColor = function(transColor) {
+  this._bitmapInfo.transColor = transColor;
+};
+
+ParserAsync.prototype._handlePalette = function(palette) {
+  this._bitmapInfo.palette = palette;
+};
+
+
+ParserAsync.prototype._finished = function() {
+  if (this.errord) {
+    return;
+  }
+
+  if (!this._inflate) {
+    this.emit('error', 'No Inflate block');
+  }
+  else {
+    // no more data to inflate
+    this._inflate.end();
+  }
+  this.destroySoon();
+};
+
+ParserAsync.prototype._complete = function(filteredData) {
+
+  if (this.errord) {
+    return;
+  }
+
+  try {
+    var bitmapData = bitmapper.dataToBitMap(filteredData, this._bitmapInfo);
+
+    var normalisedBitmapData = formatNormaliser(bitmapData, this._bitmapInfo);
+    bitmapData = null;
+  }
+  catch (ex) {
+    this._handleError(ex);
+    return;
+  }
+
+  this.emit('parsed', normalisedBitmapData);
+};

build/node_modules/pngjs/lib/parser-sync.js

@@ -0,0 +1,96 @@
+'use strict';
+
+var hasSyncZlib = true;
+var zlib = require('zlib');
+var inflateSync = require('./sync-inflate');
+var SyncReader = require('./sync-reader');
+var FilterSync = require('./filter-parse-sync');
+var Parser = require('./parser');
+var bitmapper = require('./bitmapper');
+var formatNormaliser = require('./format-normaliser');
+
+
+module.exports = function(buffer, options) {
+
+  if (!hasSyncZlib) {
+    throw new Error('To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0');
+  }
+
+  var err;
+  function handleError(_err_) {
+    err = _err_;
+  }
+
+  var metaData;
+  function handleMetaData(_metaData_) {
+    metaData = _metaData_;
+  }
+
+  function handleTransColor(transColor) {
+    metaData.transColor = transColor;
+  }
+
+  function handlePalette(palette) {
+    metaData.palette = palette;
+  }
+
+  var gamma;
+  function handleGamma(_gamma_) {
+    gamma = _gamma_;
+  }
+
+  var inflateDataList = [];
+  function handleInflateData(inflatedData) {
+    inflateDataList.push(inflatedData);
+  }
+
+  var reader = new SyncReader(buffer);
+
+  var parser = new Parser(options, {
+    read: reader.read.bind(reader),
+    error: handleError,
+    metadata: handleMetaData,
+    gamma: handleGamma,
+    palette: handlePalette,
+    transColor: handleTransColor,
+    inflateData: handleInflateData
+  });
+
+  parser.start();
+  reader.process();
+
+  if (err) {
+    throw err;
+  }
+
+  //join together the inflate datas
+  var inflateData = Buffer.concat(inflateDataList);
+  inflateDataList.length = 0;
+
+  var inflatedData;
+  if (metaData.interlace) {
+    inflatedData = zlib.inflateSync(inflateData);
+  } else {
+    var rowSize = ((metaData.width * metaData.bpp * metaData.depth + 7) >> 3) + 1;
+    var imageSize = rowSize * metaData.height;
+    inflatedData = inflateSync(inflateData, { chunkSize: imageSize, maxLength: imageSize });
+  }
+  inflateData = null;
+
+  if (!inflatedData || !inflatedData.length) {
+    throw new Error('bad png - invalid inflate data response');
+  }
+
+  var unfilteredData = FilterSync.process(inflatedData, metaData);
+  inflateData = null;
+
+  var bitmapData = bitmapper.dataToBitMap(unfilteredData, metaData);
+  unfilteredData = null;
+
+  var normalisedBitmapData = formatNormaliser(bitmapData, metaData);
+
+  metaData.data = normalisedBitmapData;
+  metaData.gamma = gamma || 0;
+
+  return metaData;
+};

build/node_modules/pngjs/lib/parser.js

@@ -0,0 +1,289 @@
+'use strict';
+
+var constants = require('./constants');
+var CrcCalculator = require('./crc');
+
+
+var Parser = module.exports = function(options, dependencies) {
+
+  this._options = options;
+  options.checkCRC = options.checkCRC !== false;
+
+  this._hasIHDR = false;
+  this._hasIEND = false;
+
+  // input flags/metadata
+  this._palette = [];
+  this._colorType = 0;
+
+  this._chunks = {};
+  this._chunks[constants.TYPE_IHDR] = this._handleIHDR.bind(this);
+  this._chunks[constants.TYPE_IEND] = this._handleIEND.bind(this);
+  this._chunks[constants.TYPE_IDAT] = this._handleIDAT.bind(this);
+  this._chunks[constants.TYPE_PLTE] = this._handlePLTE.bind(this);
+  this._chunks[constants.TYPE_tRNS] = this._handleTRNS.bind(this);
+  this._chunks[constants.TYPE_gAMA] = this._handleGAMA.bind(this);
+
+  this.read = dependencies.read;
+  this.error = dependencies.error;
+  this.metadata = dependencies.metadata;
+  this.gamma = dependencies.gamma;
+  this.transColor = dependencies.transColor;
+  this.palette = dependencies.palette;
+  this.parsed = dependencies.parsed;
+  this.inflateData = dependencies.inflateData;
+  this.finished = dependencies.finished;
+};
+
+Parser.prototype.start = function() {
+  this.read(constants.PNG_SIGNATURE.length,
+    this._parseSignature.bind(this)
+  );
+};
+
+Parser.prototype._parseSignature = function(data) {
+
+  var signature = constants.PNG_SIGNATURE;
+
+  for (var i = 0; i < signature.length; i++) {
+    if (data[i] !== signature[i]) {
+      this.error(new Error('Invalid file signature'));
+      return;
+    }
+  }
+  this.read(8, this._parseChunkBegin.bind(this));
+};
+
+Parser.prototype._parseChunkBegin = function(data) {
+
+  // chunk content length
+  var length = data.readUInt32BE(0);
+
+  // chunk type
+  var type = data.readUInt32BE(4);
+  var name = '';
+  for (var i = 4; i < 8; i++) {
+    name += String.fromCharCode(data[i]);
+  }
+
+  //console.log('chunk ', name, length);
+
+  // chunk flags
+  var ancillary = Boolean(data[4] & 0x20); // or critical
+//    priv = Boolean(data[5] & 0x20), // or public
+//    safeToCopy = Boolean(data[7] & 0x20); // or unsafe
+
+  if (!this._hasIHDR && type !== constants.TYPE_IHDR) {
+    this.error(new Error('Expected IHDR on beggining'));
+    return;
+  }
+
+  this._crc = new CrcCalculator();
+  this._crc.write(new Buffer(name));
+
+  if (this._chunks[type]) {
+    return this._chunks[type](length);
+  }
+
+  if (!ancillary) {
+    this.error(new Error('Unsupported critical chunk type ' + name));
+    return;
+  }
+
+  this.read(length + 4, this._skipChunk.bind(this));
+};
+
+Parser.prototype._skipChunk = function(/*data*/) {
+  this.read(8, this._parseChunkBegin.bind(this));
+};
+
+Parser.prototype._handleChunkEnd = function() {
+  this.read(4, this._parseChunkEnd.bind(this));
+};
+
+Parser.prototype._parseChunkEnd = function(data) {
+
+  var fileCrc = data.readInt32BE(0);
+  var calcCrc = this._crc.crc32();
+
+  // check CRC
+  if (this._options.checkCRC && calcCrc !== fileCrc) {
+    this.error(new Error('Crc error - ' + fileCrc + ' - ' + calcCrc));
+    return;
+  }
+
+  if (!this._hasIEND) {
+    this.read(8, this._parseChunkBegin.bind(this));
+  }
+};
+
+Parser.prototype._handleIHDR = function(length) {
+  this.read(length, this._parseIHDR.bind(this));
+};
+Parser.prototype._parseIHDR = function(data) {
+
+  this._crc.write(data);
+
+  var width = data.readUInt32BE(0);
+  var height = data.readUInt32BE(4);
+  var depth = data[8];
+  var colorType = data[9]; // bits: 1 palette, 2 color, 4 alpha
+  var compr = data[10];
+  var filter = data[11];
+  var interlace = data[12];
+
+  // console.log('    width', width, 'height', height,
+  //     'depth', depth, 'colorType', colorType,
+  //     'compr', compr, 'filter', filter, 'interlace', interlace
+  // );
+
+  if (depth !== 8 && depth !== 4 && depth !== 2 && depth !== 1 && depth !== 16) {
+    this.error(new Error('Unsupported bit depth ' + depth));
+    return;
+  }
+  if (!(colorType in constants.COLORTYPE_TO_BPP_MAP)) {
+    this.error(new Error('Unsupported color type'));
+    return;
+  }
+  if (compr !== 0) {
+    this.error(new Error('Unsupported compression method'));
+    return;
+  }
+  if (filter !== 0) {
+    this.error(new Error('Unsupported filter method'));
+    return;
+  }
+  if (interlace !== 0 && interlace !== 1) {
+    this.error(new Error('Unsupported interlace method'));
+    return;
+  }
+
+  this._colorType = colorType;
+
+  var bpp = constants.COLORTYPE_TO_BPP_MAP[this._colorType];
+
+  this._hasIHDR = true;
+
+  this.metadata({
+    width: width,
+    height: height,
+    depth: depth,
+    interlace: Boolean(interlace),
+    palette: Boolean(colorType & constants.COLORTYPE_PALETTE),
+    color: Boolean(colorType & constants.COLORTYPE_COLOR),
+    alpha: Boolean(colorType & constants.COLORTYPE_ALPHA),
+    bpp: bpp,
+    colorType: colorType
+  });
+
+  this._handleChunkEnd();
+};
+
+
+Parser.prototype._handlePLTE = function(length) {
+  this.read(length, this._parsePLTE.bind(this));
+};
+Parser.prototype._parsePLTE = function(data) {
+
+  this._crc.write(data);
+
+  var entries = Math.floor(data.length / 3);
+  // console.log('Palette:', entries);
+
+  for (var i = 0; i < entries; i++) {
+    this._palette.push([
+      data[i * 3],
+      data[i * 3 + 1],
+      data[i * 3 + 2],
+      0xff
+    ]);
+  }
+
+  this.palette(this._palette);
+
+  this._handleChunkEnd();
+};
+
+Parser.prototype._handleTRNS = function(length) {
+  this.read(length, this._parseTRNS.bind(this));
+};
+Parser.prototype._parseTRNS = function(data) {
+
+  this._crc.write(data);
+
+  // palette
+  if (this._colorType === constants.COLORTYPE_PALETTE_COLOR) {
+    if (this._palette.length === 0) {
+      this.error(new Error('Transparency chunk must be after palette'));
+      return;
+    }
+    if (data.length > this._palette.length) {
+      this.error(new Error('More transparent colors than palette size'));
+      return;
+    }
+    for (var i = 0; i < data.length; i++) {
+      this._palette[i][3] = data[i];
+    }
+    this.palette(this._palette);
+  }
+
+  // for colorType 0 (grayscale) and 2 (rgb)
+  // there might be one gray/color defined as transparent
+  if (this._colorType === constants.COLORTYPE_GRAYSCALE) {
+    // grey, 2 bytes
+    this.transColor([data.readUInt16BE(0)]);
+  }
+  if (this._colorType === constants.COLORTYPE_COLOR) {
+    this.transColor([data.readUInt16BE(0), data.readUInt16BE(2), data.readUInt16BE(4)]);
+  }
+
+  this._handleChunkEnd();
+};
+
+Parser.prototype._handleGAMA = function(length) {
+  this.read(length, this._parseGAMA.bind(this));
+};
+Parser.prototype._parseGAMA = function(data) {
+
+  this._crc.write(data);
+  this.gamma(data.readUInt32BE(0) / constants.GAMMA_DIVISION);
+
+  this._handleChunkEnd();
+};
+
+Parser.prototype._handleIDAT = function(length) {
+  this.read(-length, this._parseIDAT.bind(this, length));
+};
+Parser.prototype._parseIDAT = function(length, data) {
+
+  this._crc.write(data);
+
+  if (this._colorType === constants.COLORTYPE_PALETTE_COLOR && this._palette.length === 0) {
+    throw new Error('Expected palette not found');
+  }
+
+  this.inflateData(data);
+  var leftOverLength = length - data.length;
+
+  if (leftOverLength > 0) {
+    this._handleIDAT(leftOverLength);
+  }
+  else {
+    this._handleChunkEnd();
+  }
+};
+
+Parser.prototype._handleIEND = function(length) {
+  this.read(length, this._parseIEND.bind(this));
+};
+Parser.prototype._parseIEND = function(data) {
+
+  this._crc.write(data);
+
+  this._hasIEND = true;
+  this._handleChunkEnd();
+
+  if (this.finished) {
+    this.finished();
+  }
+};

build/node_modules/pngjs/lib/png-sync.js

@@ -0,0 +1,16 @@
+'use strict';
+
+
+var parse = require('./parser-sync');
+var pack = require('./packer-sync');
+
+
+exports.read = function(buffer, options) {
+
+  return parse(buffer, options || {});
+};
+
+exports.write = function(png, options) {
+
+  return pack(png, options);
+};

build/node_modules/pngjs/lib/png.js

@@ -0,0 +1,173 @@
+'use strict';
+
+var util = require('util');
+var Stream = require('stream');
+var Parser = require('./parser-async');
+var Packer = require('./packer-async');
+var PNGSync = require('./png-sync');
+
+
+var PNG = exports.PNG = function(options) {
+  Stream.call(this);
+
+  options = options || {}; // eslint-disable-line no-param-reassign
+
+  // coerce pixel dimensions to integers (also coerces undefined -> 0):
+  this.width = options.width | 0;
+  this.height = options.height | 0;
+
+  this.data = this.width > 0 && this.height > 0 ?
+    new Buffer(4 * this.width * this.height) : null;
+
+  if (options.fill && this.data) {
+    this.data.fill(0);
+  }
+
+  this.gamma = 0;
+  this.readable = this.writable = true;
+
+  this._parser = new Parser(options);
+
+  this._parser.on('error', this.emit.bind(this, 'error'));
+  this._parser.on('close', this._handleClose.bind(this));
+  this._parser.on('metadata', this._metadata.bind(this));
+  this._parser.on('gamma', this._gamma.bind(this));
+  this._parser.on('parsed', function(data) {
+    this.data = data;
+    this.emit('parsed', data);
+  }.bind(this));
+
+  this._packer = new Packer(options);
+  this._packer.on('data', this.emit.bind(this, 'data'));
+  this._packer.on('end', this.emit.bind(this, 'end'));
+  this._parser.on('close', this._handleClose.bind(this));
+  this._packer.on('error', this.emit.bind(this, 'error'));
+
+};
+util.inherits(PNG, Stream);
+
+PNG.sync = PNGSync;
+
+PNG.prototype.pack = function() {
+
+  if (!this.data || !this.data.length) {
+    this.emit('error', 'No data provided');
+    return this;
+  }
+
+  process.nextTick(function() {
+    this._packer.pack(this.data, this.width, this.height, this.gamma);
+  }.bind(this));
+
+  return this;
+};
+
+
+PNG.prototype.parse = function(data, callback) {
+
+  if (callback) {
+    var onParsed, onError;
+
+    onParsed = function(parsedData) {
+      this.removeListener('error', onError);
+
+      this.data = parsedData;
+      callback(null, this);
+    }.bind(this);
+
+    onError = function(err) {
+      this.removeListener('parsed', onParsed);
+
+      callback(err, null);
+    }.bind(this);
+
+    this.once('parsed', onParsed);
+    this.once('error', onError);
+  }
+
+  this.end(data);
+  return this;
+};
+
+PNG.prototype.write = function(data) {
+  this._parser.write(data);
+  return true;
+};
+
+PNG.prototype.end = function(data) {
+  this._parser.end(data);
+};
+
+PNG.prototype._metadata = function(metadata) {
+  this.width = metadata.width;
+  this.height = metadata.height;
+
+  this.emit('metadata', metadata);
+};
+
+PNG.prototype._gamma = function(gamma) {
+  this.gamma = gamma;
+};
+
+PNG.prototype._handleClose = function() {
+  if (!this._parser.writable && !this._packer.readable) {
+    this.emit('close');
+  }
+};
+
+
+PNG.bitblt = function(src, dst, srcX, srcY, width, height, deltaX, deltaY) { // eslint-disable-line max-params
+  // coerce pixel dimensions to integers (also coerces undefined -> 0):
+  /* eslint-disable no-param-reassign */
+  srcX |= 0;
+  srcY |= 0;
+  width |= 0;
+  height |= 0;
+  deltaX |= 0;
+  deltaY |= 0;
+  /* eslint-enable no-param-reassign */
+
+  if (srcX > src.width || srcY > src.height || srcX + width > src.width || srcY + height > src.height) {
+    throw new Error('bitblt reading outside image');
+  }
+
+  if (deltaX > dst.width || deltaY > dst.height || deltaX + width > dst.width || deltaY + height > dst.height) {
+    throw new Error('bitblt writing outside image');
+  }
+
+  for (var y = 0; y < height; y++) {
+    src.data.copy(dst.data,
+      ((deltaY + y) * dst.width + deltaX) << 2,
+      ((srcY + y) * src.width + srcX) << 2,
+      ((srcY + y) * src.width + srcX + width) << 2
+    );
+  }
+};
+
+
+PNG.prototype.bitblt = function(dst, srcX, srcY, width, height, deltaX, deltaY) { // eslint-disable-line max-params
+
+  PNG.bitblt(this, dst, srcX, srcY, width, height, deltaX, deltaY);
+  return this;
+};
+
+PNG.adjustGamma = function(src) {
+  if (src.gamma) {
+    for (var y = 0; y < src.height; y++) {
+      for (var x = 0; x < src.width; x++) {
+        var idx = (src.width * y + x) << 2;
+
+        for (var i = 0; i < 3; i++) {
+          var sample = src.data[idx + i] / 255;
+          sample = Math.pow(sample, 1 / 2.2 / src.gamma);
+          src.data[idx + i] = Math.round(sample * 255);
+        }
+      }
+    }
+    src.gamma = 0;
+  }
+};
+
+PNG.prototype.adjustGamma = function() {
+  PNG.adjustGamma(this);
+};

build/node_modules/pngjs/lib/sync-inflate.js

@@ -0,0 +1,155 @@
+'use strict';
+
+var assert = require('assert').ok;
+var zlib = require('zlib');
+var util = require('util');
+
+var kMaxLength = require('buffer').kMaxLength;
+
+function Inflate(opts) {
+  if (!(this instanceof Inflate)) {
+    return new Inflate(opts);
+  }
+
+  if (opts && opts.chunkSize < zlib.Z_MIN_CHUNK) {
+    opts.chunkSize = zlib.Z_MIN_CHUNK;
+  }
+
+  zlib.Inflate.call(this, opts);
+
+  if (opts && opts.maxLength != null) {
+    this._maxLength = opts.maxLength;
+  }
+}
+
+function createInflate(opts) {
+  return new Inflate(opts);
+}
+
+function _close(engine, callback) {
+  if (callback) {
+    process.nextTick(callback);
+  }
+
+  // Caller may invoke .close after a zlib error (which will null _handle).
+  if (!engine._handle) {
+    return;
+  }
+
+  engine._handle.close();
+  engine._handle = null;
+}
+
+Inflate.prototype._processChunk = function(chunk, flushFlag, asyncCb) {
+  if (typeof asyncCb === 'function') {
+    return zlib.Inflate._processChunk.call(this, chunk, flushFlag, asyncCb);
+  }
+
+  var self = this;
+
+  var availInBefore = chunk && chunk.length;
+  var availOutBefore = this._chunkSize - this._offset;
+  var leftToInflate = this._maxLength;
+  var inOff = 0;
+
+  var buffers = [];
+  var nread = 0;
+
+  var error;
+  this.on('error', function(err) {
+    error = err;
+  });
+
+  function handleChunk(availInAfter, availOutAfter) {
+    if (self._hadError) {
+      return;
+    }
+
+    var have = availOutBefore - availOutAfter;
+    assert(have >= 0, 'have should not go down');
+
+    if (have > 0) {
+      var out = self._buffer.slice(self._offset, self._offset + have);
+      self._offset += have;
+
+      if (out.length > leftToInflate) {
+        out = out.slice(0, leftToInflate);
+      }
+
+      buffers.push(out);
+      nread += out.length;
+      leftToInflate -= out.length;
+
+      if (leftToInflate === 0) {
+        return false;
+      }
+    }
+
+    if (availOutAfter === 0 || self._offset >= self._chunkSize) {
+      availOutBefore = self._chunkSize;
+      self._offset = 0;
+      self._buffer = Buffer.allocUnsafe(self._chunkSize);
+    }
+
+    if (availOutAfter === 0) {
+      inOff += (availInBefore - availInAfter);
+      availInBefore = availInAfter;
+
+      return true;
+    }
+
+    return false;
+  }
+
+  assert(this._handle, 'zlib binding closed');
+  do {
+    var res = this._handle.writeSync(flushFlag,
+                                     chunk, // in
+                                     inOff, // in_off
+                                     availInBefore, // in_len
+                                     this._buffer, // out
+                                     this._offset, //out_off
+                                     availOutBefore); // out_len
+  } while (!this._hadError && handleChunk(res[0], res[1]));
+
+  if (this._hadError) {
+    throw error;
+  }
+
+  if (nread >= kMaxLength) {
+    _close(this);
+    throw new RangeError('Cannot create final Buffer. It would be larger than 0x' + kMaxLength.toString(16) + ' bytes');
+  }
+
+  var buf = Buffer.concat(buffers, nread);
+  _close(this);
+
+  return buf;
+};
+
+util.inherits(Inflate, zlib.Inflate);
+
+function zlibBufferSync(engine, buffer) {
+  if (typeof buffer === 'string') {
+    buffer = Buffer.from(buffer);
+  }
+  if (!(buffer instanceof Buffer)) {
+    throw new TypeError('Not a string or buffer');
+  }
+
+  var flushFlag = engine._finishFlushFlag;
+  if (flushFlag == null) {
+    flushFlag = zlib.Z_FINISH;
+  }
+
+  return engine._processChunk(buffer, flushFlag);
+}
+
+function inflateSync(buffer, opts) {
+  return zlibBufferSync(new Inflate(opts), buffer);
+}
+
+module.exports = exports = inflateSync;
+exports.Inflate = Inflate;
+exports.createInflate = createInflate;
+exports.inflateSync = inflateSync;

build/node_modules/pngjs/lib/sync-reader.js

@@ -0,0 +1,51 @@
+'use strict';
+
+var SyncReader = module.exports = function(buffer) {
+
+  this._buffer = buffer;
+  this._reads = [];
+};
+
+SyncReader.prototype.read = function(length, callback) {
+
+  this._reads.push({
+    length: Math.abs(length),  // if length < 0 then at most this length
+    allowLess: length < 0,
+    func: callback
+  });
+};
+
+SyncReader.prototype.process = function() {
+
+  // as long as there is any data and read requests
+  while (this._reads.length > 0 && this._buffer.length) {
+
+    var read = this._reads[0];
+
+    if (this._buffer.length && (this._buffer.length >= read.length || read.allowLess)) {
+
+      // ok there is any data so that we can satisfy this request
+      this._reads.shift(); // == read
+
+      var buf = this._buffer;
+
+      this._buffer = buf.slice(read.length);
+
+      read.func.call(this, buf.slice(0, read.length));
+
+    }
+    else {
+      break;
+    }
+
+  }
+
+  if (this._reads.length > 0) {
+    return new Error('There are some read requests waitng on finished stream');
+  }
+
+  if (this._buffer.length > 0) {
+    return new Error('unrecognised content at end of stream');
+  }
+
+};