diff --git a/external/jpgjs/jpg.js b/external/jpgjs/jpg.js
new file mode 100644
index 000000000..6ae443c41
--- /dev/null
+++ b/external/jpgjs/jpg.js
@@ -0,0 +1,722 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+
+// - The JPEG specification can be found in the ITU CCITT Recommendation T.81
+//   (www.w3.org/Graphics/JPEG/itu-t81.pdf)
+// - The JFIF specification can be found in the JPEG File Interchange Format
+//   (www.w3.org/Graphics/JPEG/jfif3.pdf)
+// - The Adobe Application-Specific JPEG markers in the Supporting the DCT Filters
+//   in PostScript Level 2, Technical Note #5116
+//   (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf)
+
+var JpegImage = (function jpegImage() {
+  "use strict";
+
+  function constructor(colorTransform) {
+    this.colorTransform = typeof colorTransform !== 'undefined' ? colorTransform : -1;
+  }
+
+  var iDCTTables = (function initDCTTables() {
+    var cosTables = [], i, j;
+    for (i = 0; i < 8; i++) {
+      cosTables.push(new Float32Array(8));
+      for (j = 0; j < 8; j++)
+        cosTables[i][j] = Math.cos((2 * i + 1) * j * Math.PI / 16) *
+          (j > 0 ? 1 : 1/Math.sqrt(2));
+    }
+
+    var zzTransform = new Int32Array([
+      0, 1, 5, 6, 14, 15, 27, 28, 2, 4, 7, 13, 16, 26, 29, 42, 3, 8, 12,
+      17, 25, 30, 41, 43, 9, 11, 18, 24, 31, 40, 44, 53, 10, 19, 23, 32,
+      39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60, 21, 34, 37, 47,
+      50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63]);
+
+    var x, y, u, v;
+    var tables = [];
+    for (y = 0; y < 8; y++) {
+      var cosTable_y = cosTables[y];
+      for (x = 0; x < 8; x++) {
+        var cosTable_x = cosTables[x];
+        var table = new Float32Array(64);
+        i = 0;
+        for (v = 0; v < 8; v++) {
+          for (u = 0; u < 8; u++)
+            table[zzTransform[i++]] = cosTable_x[u] * cosTable_y[v];
+        }
+        tables.push(table);
+      }
+    }
+    return tables;
+  })();
+
+  function buildHuffmanTable(codeLengths, values) {
+    var k = 0, code = [], i, j, length = 16;
+    while (length > 0 && !codeLengths[length - 1])
+      length--;
+    code.push({children: [], index: 0});
+    var p = code[0], q;
+    for (i = 0; i < length; i++) {
+      for (j = 0; j < codeLengths[i]; j++) {
+        p = code.pop();
+        p.children[p.index] = values[k];
+        while (p.index > 0) {
+          p = code.pop();
+        }
+        p.index++;
+        code.push(p);
+        while (code.length <= i) {
+          code.push(q = {children: [], index: 0});
+          p.children[p.index] = q.children;
+          p = q;
+        }
+        k++;
+      }
+      if (i + 1 < length) {
+        // p here points to last code
+        code.push(q = {children: [], index: 0});
+        p.children[p.index] = q.children;
+        p = q;
+      }
+    }
+    return code[0].children;
+  }
+
+  function decodeScan(data, offset,
+                      frame, components, resetInterval,
+                      spectralStart, spectralEnd,
+                      successivePrev, successive) {
+    var precision = frame.precision;
+    var samplesPerLine = frame.samplesPerLine;
+    var scanLines = frame.scanLines;
+    var mcusPerLine = frame.mcusPerLine;
+    var progressive = frame.progressive;
+    var maxH = frame.maxH, maxV = frame.maxV;
+
+    var startOffset = offset, bitsData = 0, bitsCount = 0;
+    function readBit() {
+      if (bitsCount > 0) {
+        bitsCount--;
+        return (bitsData >> bitsCount) & 1;
+      }
+      bitsData = data[offset++];
+      if (bitsData == 0xFF) {
+        var nextByte = data[offset++];
+        if (nextByte) {
+          throw "unexpected marker: " + ((bitsData << 8) | nextByte).toString(16);
+        }
+        // unstuff 0
+      }
+      bitsCount = 7;
+      return bitsData >>> 7;
+    }
+    function decodeHuffman(tree) {
+      var node = tree, bit;
+      while ((bit = readBit()) !== null) {
+        node = node[bit];
+        if (typeof node === 'number')
+          return node;
+        if (typeof node !== 'object')
+          throw "invalid huffman sequence";
+      }
+      return null;
+    }
+    function receive(length) {
+      var n = 0;
+      while (length > 0) {
+        var bit = readBit();
+        if (bit === null) return;
+        n = (n << 1) | bit;
+        length--;
+      }
+      return n;
+    }
+    function receiveAndExtend(length) {
+      var n = receive(length);
+      if (n >= 1 << (length - 1))
+        return n;
+      return n + (-1 << length) + 1;
+    }
+    function decodeBaseline(component, zz) {
+      var t = decodeHuffman(component.huffmanTableDC);
+      var diff = t === 0 ? 0 : receiveAndExtend(t);
+      zz[0]= (component.pred += diff);
+      var k = 1;
+      while (k < 64) {
+        var rs = decodeHuffman(component.huffmanTableAC);
+        var s = rs & 15, r = rs >> 4;
+        if (s === 0) {
+          if (r < 15)
+            break;
+          k += 16;
+          continue;
+        }
+        k += r;
+        zz[k] = receiveAndExtend(s);
+        k++;
+      }
+    }
+    function decodeDCFirst(component, zz) {
+      var t = decodeHuffman(component.huffmanTableDC);
+      var diff = t === 0 ? 0 : (receiveAndExtend(t) << successive);
+      zz[0] = (component.pred += diff);
+    }
+    function decodeDCSuccessive(component, zz) {
+      zz[0] |= readBit() << successive;
+    }
+    var eobrun = 0;
+    function decodeACFirst(component, zz) {
+      if (eobrun > 0) {
+        eobrun--;
+        return;
+      }
+      var k = spectralStart, e = spectralEnd;
+      while (k <= e) {
+        var rs = decodeHuffman(component.huffmanTableAC);
+        var s = rs & 15, r = rs >> 4;
+        if (s === 0) {
+          if (r < 15) {
+            eobrun = receive(r) + (1 << r) - 1;
+            break;
+          }
+          k += 16;
+          continue;
+        }
+        k += r;
+        zz[k] = receiveAndExtend(s) * (1 << successive);
+        k++;
+      }
+    }
+    var successiveACState = 0, successiveACNextValue;
+    function decodeACSuccessive(component, zz) {
+      var k = spectralStart, e = spectralEnd, r = 0;
+      while (k <= e) {
+        switch (successiveACState) {
+        case 0: // initial state
+          var rs = decodeHuffman(component.huffmanTableAC);
+          var s = rs & 15, r = rs >> 4;
+          if (s === 0) {
+            if (r < 15) {
+              eobrun = receive(r) + (1 << r);
+              successiveACState = 4;
+            } else {
+              r = 16;
+              successiveACState = 1;
+            }
+          } else {
+            if (s !== 1)
+              throw "invalid ACn encoding";
+            successiveACNextValue = receiveAndExtend(s);
+            successiveACState = r ? 2 : 3;
+          }
+          continue;
+        case 1: // skipping r zero items
+        case 2:
+          if (zz[k])
+            zz[k] += (readBit() << successive);
+          else {
+            r--;
+            if (r === 0)
+              successiveACState = successiveACState == 2 ? 3 : 0;
+          }
+          break;
+        case 3: // set value for a zero item
+          if (zz[k])
+            zz[k] += (readBit() << successive);
+          else {
+            zz[k] = successiveACNextValue << successive;
+            successiveACState = 0;
+          }
+          break;
+        case 4: // eob
+          if (zz[k])
+            zz[k] += (readBit() << successive);
+          break;
+        }
+        k++;
+      }
+      if (successiveACState === 4) {
+        eobrun--;
+        if (eobrun === 0)
+          successiveACState = 0;
+      }
+    }
+    function decodeMcu(component, decode, mcu, row, col) {
+      var mcuRow = (mcu / mcusPerLine) | 0;
+      var mcuCol = mcu % mcusPerLine;
+      var blockRow = mcuRow * component.v + row;
+      var blockCol = mcuCol * component.h + col;
+      decode(component, component.blocks[blockRow][blockCol]);
+    }
+    function decodeBlock(component, decode, mcu) {
+      var blockRow = (mcu / component.blocksPerLine) | 0;
+      var blockCol = mcu % component.blocksPerLine;
+      decode(component, component.blocks[blockRow][blockCol]);
+    }
+
+    var componentsLength = components.length;
+    var component, i, j, k, n;
+    var decodeFn;
+    if (progressive) {
+      if (spectralStart === 0)
+        decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
+      else
+        decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
+    } else {
+      decodeFn = decodeBaseline;
+    }
+
+    var mcu = 0, marker;
+    var mcuExpected;
+    if (componentsLength == 1) {
+      mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
+    } else {
+      mcuExpected = mcusPerLine * frame.mcusPerColumn;
+    }
+    if (!resetInterval) resetInterval = mcuExpected;
+
+    var h, v;
+    while (mcu < mcuExpected) {
+      // reset interval stuff
+      for (i = 0; i < componentsLength; i++)
+        components[i].pred = 0;
+      eobrun = 0;
+
+      if (componentsLength == 1) {
+        component = components[0];
+        for (n = 0; n < resetInterval; n++) {
+          decodeBlock(component, decodeFn, mcu);
+          mcu++;
+        }
+      } else {
+        for (n = 0; n < resetInterval; n++) {
+          for (i = 0; i < componentsLength; i++) {
+            component = components[i];
+            h = component.h;
+            v = component.v;
+            for (j = 0; j < v; j++) {
+              for (k = 0; k < h; k++) {
+                decodeMcu(component, decodeFn, mcu, j, k);
+              }
+            }
+          }
+          mcu++;
+        }
+      }
+
+      // find marker
+      bitsCount = 0;
+      marker = (data[offset] << 8) | data[offset + 1];
+      if (marker <= 0xFF00) {
+        throw "marker was not found";
+      }
+
+      if (marker >= 0xFFD0 && marker <= 0xFFD7) { // RSTx
+        offset += 2;
+      }
+      else
+        break;
+    }
+
+    return offset - startOffset;
+  }
+
+  function buildComponentData(frame, component) {
+    var lines = [];
+    var blocksPerLine = component.blocksPerLine;
+    var blocksPerColumn = component.blocksPerColumn;
+    var samplesPerLine = blocksPerLine << 3;
+
+    function quantizeAndInverse(zz) {
+      var qt = component.quantizationTable;
+      var precisionShift = frame.precision - 8;
+
+      var R = new Int32Array(64);
+      for (i = 0; i < 64; i++)
+        R[i] = zz[i] * qt[i];
+
+      var r = new Uint8Array(64), i, j;
+      for (i = 0; i < 64; i++) {
+        var sum = 0;
+        var table = iDCTTables[i];
+        for (j = 0; j < 64; j++)
+          sum += table[j] * R[j];
+        // TODO loosing precision?
+        var sample = 128 + ((sum / 4) >> precisionShift);
+        // clamping
+        r[i] = sample < 0 ? 0 : sample > 0xFF ? 0xFF : sample;
+      }
+      return r;
+    }
+
+    var i, j;
+    for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
+      var scanLine = blockRow << 3;
+      for (i = 0; i < 8; i++)
+        lines.push(new Uint8Array(samplesPerLine));
+      for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {
+        var r = quantizeAndInverse(component.blocks[blockRow][blockCol]);
+
+        var offset = 0, sample = blockCol << 3;
+        for (j = 0; j < 8; j++) {
+          var line = lines[scanLine + j];
+          for (i = 0; i < 8; i++)
+            line[sample + i] = r[offset++];
+        }
+      }
+    }
+    return lines;
+  }
+
+  constructor.prototype = {
+    load: function load(path) {
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", path, true);
+      xhr.responseType = "arraybuffer";
+      xhr.onload = (function() {
+        // TODO catch parse error
+        var data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer);
+        this.parse(data);
+        if (this.onload)
+          this.onload();
+      }).bind(this);
+      xhr.send(null);
+    },
+    parse: function parse(data) {
+      var offset = 0, length = data.length;
+      function readUint16() {
+        var value = (data[offset] << 8) | data[offset + 1];
+        offset += 2;
+        return value;
+      }
+      function readDataBlock() {
+        var length = readUint16();
+        var array = data.subarray(offset, offset + length - 2);
+        offset += array.length;
+        return array;
+      }
+      function prepareComponents(frame) {
+        var maxH = 0, maxV = 0;
+        var component, componentId;
+        for (componentId in frame.components) {
+          if (frame.components.hasOwnProperty(componentId)) {
+            component = frame.components[componentId];
+            if (maxH < component.h) maxH = component.h;
+            if (maxV < component.v) maxV = component.v;
+          }
+        }
+        var mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / maxH);
+        var mcusPerColumn = Math.ceil(frame.scanLines / 8 / maxV);
+        for (componentId in frame.components) {
+          if (frame.components.hasOwnProperty(componentId)) {
+            component = frame.components[componentId];
+            var blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / maxH);
+            var blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines  / 8) * component.v / maxV);
+            var blocksPerLineForMcu = mcusPerLine * component.h;
+            var blocksPerColumnForMcu = mcusPerColumn * component.v;
+            var blocks = [];
+            for (var i = 0; i < blocksPerColumnForMcu; i++) {
+              var row = [];
+              for (var j = 0; j < blocksPerLineForMcu; j++)
+                row.push(new Int32Array(64));
+              blocks.push(row);
+            }
+            component.blocksPerLine = blocksPerLine;
+            component.blocksPerColumn = blocksPerColumn;
+            component.blocks = blocks;
+          }
+        }
+        frame.maxH = maxH;
+        frame.maxV = maxV;
+        frame.mcusPerLine = mcusPerLine;
+        frame.mcusPerColumn = mcusPerColumn;
+      }
+      var jfif = null;
+      var adobe = null;
+      var pixels = null;
+      var frame, resetInterval;
+      var quantizationTables = [], frames = [];
+      var huffmanTablesAC = [], huffmanTablesDC = [];
+      var fileMarker = readUint16();
+      if (fileMarker != 0xFFD8) { // SOI (Start of Image)
+        throw "SOI not found";
+      }
+
+      fileMarker = readUint16();
+      while (fileMarker != 0xFFD9) { // EOI (End of image)
+        var i, j, l;
+        switch(fileMarker) {
+          case 0xFFE0: // APP0 (Application Specific)
+          case 0xFFE1: // APP1
+          case 0xFFE2: // APP2
+          case 0xFFE3: // APP3
+          case 0xFFE4: // APP4
+          case 0xFFE5: // APP5
+          case 0xFFE6: // APP6
+          case 0xFFE7: // APP7
+          case 0xFFE8: // APP8
+          case 0xFFE9: // APP9
+          case 0xFFEA: // APP10
+          case 0xFFEB: // APP11
+          case 0xFFEC: // APP12
+          case 0xFFED: // APP13
+          case 0xFFEE: // APP14
+          case 0xFFEF: // APP15
+          case 0xFFFE: // COM (Comment)
+            var appData = readDataBlock();
+
+            if (fileMarker === 0xFFE0) {
+              if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 &&
+                appData[3] === 0x46 && appData[4] === 0) { // 'JFIF\x00'
+                jfif = {
+                  version: { major: appData[5], minor: appData[6] },
+                  densityUnits: appData[7],
+                  xDensity: (appData[8] << 8) | appData[9],
+                  yDensity: (appData[10] << 8) | appData[11],
+                  thumbWidth: appData[12],
+                  thumbHeight: appData[13],
+                  thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
+                };
+              }
+            }
+            // TODO APP1 - Exif
+            if (fileMarker === 0xFFEE) {
+              if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F &&
+                appData[3] === 0x62 && appData[4] === 0x65 && appData[5] === 0) { // 'Adobe\x00'
+                adobe = {
+                  version: appData[6],
+                  flags0: (appData[7] << 8) | appData[8],
+                  flags1: (appData[9] << 8) | appData[10],
+                  transformCode: appData[11]
+                };
+              }
+            }
+            break;
+
+          case 0xFFDB: // DQT (Define Quantization Tables)
+            var quantizationTableCount = Math.floor((readUint16() - 2) / 65);
+            for (i = 0; i < quantizationTableCount; i++) {
+              var quantizationTableSpec = data[offset++];
+              var tableData = new Int32Array(64);
+              if ((quantizationTableSpec >> 4) === 0) { // 8 bit values
+                for (j = 0; j < 64; j++)
+                  tableData[j] = data[offset++];
+              } else if ((quantizationTableSpec >> 4) === 1) { //16 bit
+                  tableData[j] = readUint16();
+              } else
+                throw "DQT: invalid table spec";
+              quantizationTables[quantizationTableSpec & 15] = tableData;
+            }
+            break;
+
+          case 0xFFC0: // SOF0 (Start of Frame, Baseline DCT)
+          case 0xFFC2: // SOF2 (Start of Frame, Progressive DCT)
+            readUint16(); // skip data length
+            frame = {};
+            frame.progressive = (fileMarker === 0xFFC2);
+            frame.precision = data[offset++];
+            frame.scanLines = readUint16();
+            frame.samplesPerLine = readUint16();
+            frame.components = [];
+            var componentsCount = data[offset++], componentId;
+            var maxH = 0, maxV = 0;
+            for (i = 0; i < componentsCount; i++) {
+              componentId = data[offset];
+              var h = data[offset + 1] >> 4;
+              var v = data[offset + 1] & 15;
+              var qId = data[offset + 2];
+              frame.components[componentId] = {
+                h: h,
+                v: v,
+                quantizationTable: quantizationTables[qId]
+              };
+              offset += 3;
+            }
+            prepareComponents(frame);
+            frames.push(frame);
+            break;
+
+          case 0xFFC4: // DHT (Define Huffman Tables)
+            var huffmanLength = readUint16();
+            for (i = 2; i < huffmanLength;) {
+              var huffmanTableSpec = data[offset++];
+              var codeLengths = new Uint8Array(16);
+              var codeLengthSum = 0;
+              for (j = 0; j < 16; j++, offset++)
+                codeLengthSum += (codeLengths[j] = data[offset]);
+              var huffmanValues = new Uint8Array(codeLengthSum);
+              for (j = 0; j < codeLengthSum; j++, offset++)
+                huffmanValues[j] = data[offset];
+              i += 17 + codeLengthSum;
+
+              ((huffmanTableSpec >> 4) === 0 ? 
+                huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] =
+                buildHuffmanTable(codeLengths, huffmanValues);
+            }
+            break;
+
+          case 0xFFDD: // DRI (Define Restart Interval)
+            readUint16(); // skip data length
+            resetInterval = readUint16();
+            break;
+
+          case 0xFFDA: // SOS (Start of Scan)
+            var scanLength = readUint16();
+            var selectorsCount = data[offset++];
+            var components = [], component;
+            for (i = 0; i < selectorsCount; i++) {
+              component = frame.components[data[offset++]];
+              var tableSpec = data[offset++];
+              component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
+              component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
+              components.push(component);
+            }
+            var spectralStart = data[offset++];
+            var spectralEnd = data[offset++];
+            var successiveApproximation = data[offset++];
+            var processed = decodeScan(data, offset,
+              frame, components, resetInterval,
+              spectralStart, spectralEnd,
+              successiveApproximation >> 4, successiveApproximation & 15);
+            offset += processed;
+            break;
+          default:
+            throw "unknown JPEG marker " + fileMarker.toString(16);
+        }
+        fileMarker = readUint16();
+      }
+      if (frames.length != 1)
+        throw "only single frame JPEGs supported";
+
+      this.width = frame.samplesPerLine;
+      this.height = frame.scanLines;
+      this.jfif = jfif;
+      this.adobe = adobe;
+      this.components = [];
+      for (var id in frame.components) {
+        if (frame.components.hasOwnProperty(id)) {
+          this.components.push({
+            lines: buildComponentData(frame, frame.components[id]),
+            scaleX: frame.components[id].h / frame.maxH,
+            scaleY: frame.components[id].v / frame.maxV
+          });
+        }
+      }
+    },
+    getData: function getData(width, height) {
+      function clampTo8bit(a) {
+        return a < 0 ? 0 : a > 255 ? 255 : a;
+      }
+      var scaleX = this.width / width, scaleY = this.height / height;
+
+      var component1, component2, component3, component4;
+      var component1Line, component2Line, component3Line, component4Line;
+      var x, y;
+      var offset = 0;
+      var Y, Cb, Cr, K, C, M, Ye, R, G, B;
+      var colorTransform;
+      var dataLength = width * height * this.components.length;
+      var data = new Uint8Array(dataLength);
+      switch (this.components.length) {
+        case 1:
+          component1 = this.components[0];
+          for (y = 0; y < height; y++) {
+            component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
+            for (x = 0; x < width; x++) {
+              Y = component1Line[0 | (x * component1.scaleX * scaleX)];
+
+              data[offset++] = Y;
+            }
+          }
+          break;
+        case 3:
+          // The default transform for three components is true
+          colorTransform = true;
+          // The adobe transform marker overrides any previous setting
+          if (this.adobe && this.adobe.transformCode)
+            colorTransform = true;
+          else if (typeof this.colorTransform != -1)
+            colorTransform = this.colorTransform == true;
+
+          component1 = this.components[0];
+          component2 = this.components[1];
+          component3 = this.components[2];
+          for (y = 0; y < height; y++) {
+            component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
+            component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
+            component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
+            for (x = 0; x < width; x++) {
+              if (!colorTransform) {
+                R = component1Line[0 | (x * component1.scaleX * scaleX)];
+                G = component2Line[0 | (x * component2.scaleX * scaleX)];
+                B = component3Line[0 | (x * component3.scaleX * scaleX)];
+              } else {
+                Y = component1Line[0 | (x * component1.scaleX * scaleX)];
+                Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
+                Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
+
+                R = clampTo8bit(Y + 1.402 * (Cr - 128));
+                G = clampTo8bit(Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128));
+                B = clampTo8bit(Y + 1.772 * (Cb - 128));
+              }
+
+              data[offset++] = R;
+              data[offset++] = G;
+              data[offset++] = B;
+            }
+          }
+          break;
+        case 4:
+          if (!this.adobe)
+            throw 'Unsupported color mode (4 components)';
+          // The default transform for four components is false
+          colorTransform = false;
+          // The adobe transform marker overrides any previous setting
+          if (this.adobe && this.adobe.transformCode)
+            colorTransform = true;
+          else if (typeof this.colorTransform != -1)
+            colorTransform = this.colorTransform == true;
+
+          component1 = this.components[0];
+          component2 = this.components[1];
+          component3 = this.components[2];
+          component4 = this.components[3];
+          for (y = 0; y < height; y++) {
+            component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
+            component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
+            component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
+            component4Line = component4.lines[0 | (y * component4.scaleY * scaleY)];
+            for (x = 0; x < width; x++) {
+              if (!colorTransform) {
+                C = component1Line[0 | (x * component1.scaleX * scaleX)];
+                M = component2Line[0 | (x * component2.scaleX * scaleX)];
+                Ye = component3Line[0 | (x * component3.scaleX * scaleX)];
+                K = component4Line[0 | (x * component4.scaleX * scaleX)];
+              } else {
+                Y = component1Line[0 | (x * component1.scaleX * scaleX)];
+                Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
+                Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
+                K = component4Line[0 | (x * component4.scaleX * scaleX)];
+
+                C = 255 - clampTo8bit(Y + 1.402 * (Cr - 128));
+                M = 255 - clampTo8bit(Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128));
+                Ye = 255 - clampTo8bit(Y + 1.772 * (Cb - 128));
+              }
+              data[offset++] = C;
+              data[offset++] = M;
+              data[offset++] = Ye;
+              data[offset++] = K;
+            }
+          }
+          break;
+        default:
+          throw 'Unsupported color mode';
+      }
+      return data;
+    },
+    copyToImageData: function copyToImageData(imageData) {
+      this.getData(imageData.data, imageData.width, imageData.height);
+    }
+  };
+
+  return constructor;
+})();
\ No newline at end of file