pdfjs-dist/lib/display/canvas.js

/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';

var sharedUtil = require('../shared/util.js');
var displayDOMUtils = require('./dom_utils.js');
var displayPatternHelper = require('./pattern_helper.js');
var displayWebGL = require('./webgl.js');
var FONT_IDENTITY_MATRIX = sharedUtil.FONT_IDENTITY_MATRIX;
var IDENTITY_MATRIX = sharedUtil.IDENTITY_MATRIX;
var ImageKind = sharedUtil.ImageKind;
var OPS = sharedUtil.OPS;
var TextRenderingMode = sharedUtil.TextRenderingMode;
var Uint32ArrayView = sharedUtil.Uint32ArrayView;
var Util = sharedUtil.Util;
var assert = sharedUtil.assert;
var info = sharedUtil.info;
var isNum = sharedUtil.isNum;
var isArray = sharedUtil.isArray;
var isLittleEndian = sharedUtil.isLittleEndian;
var error = sharedUtil.error;
var shadow = sharedUtil.shadow;
var warn = sharedUtil.warn;
var TilingPattern = displayPatternHelper.TilingPattern;
var getShadingPatternFromIR = displayPatternHelper.getShadingPatternFromIR;
var WebGLUtils = displayWebGL.WebGLUtils;
var hasCanvasTypedArrays = displayDOMUtils.hasCanvasTypedArrays;
var MIN_FONT_SIZE = 16;
var MAX_FONT_SIZE = 100;
var MAX_GROUP_SIZE = 4096;
var MIN_WIDTH_FACTOR = 0.65;
var COMPILE_TYPE3_GLYPHS = true;
var MAX_SIZE_TO_COMPILE = 1000;
var FULL_CHUNK_HEIGHT = 16;
var HasCanvasTypedArraysCached = {
  get value() {
    return shadow(HasCanvasTypedArraysCached, 'value', hasCanvasTypedArrays());
  }
};
var IsLittleEndianCached = {
  get value() {
    return shadow(IsLittleEndianCached, 'value', isLittleEndian());
  }
};
function addContextCurrentTransform(ctx) {
  if (!ctx.mozCurrentTransform) {
    ctx._originalSave = ctx.save;
    ctx._originalRestore = ctx.restore;
    ctx._originalRotate = ctx.rotate;
    ctx._originalScale = ctx.scale;
    ctx._originalTranslate = ctx.translate;
    ctx._originalTransform = ctx.transform;
    ctx._originalSetTransform = ctx.setTransform;
    ctx._transformMatrix = ctx._transformMatrix || [1, 0, 0, 1, 0, 0];
    ctx._transformStack = [];
    Object.defineProperty(ctx, 'mozCurrentTransform', {
      get: function getCurrentTransform() {
        return this._transformMatrix;
      }
    });
    Object.defineProperty(ctx, 'mozCurrentTransformInverse', {
      get: function getCurrentTransformInverse() {
        var m = this._transformMatrix;
        var a = m[0],
            b = m[1],
            c = m[2],
            d = m[3],
            e = m[4],
            f = m[5];
        var ad_bc = a * d - b * c;
        var bc_ad = b * c - a * d;
        return [d / ad_bc, b / bc_ad, c / bc_ad, a / ad_bc, (d * e - c * f) / bc_ad, (b * e - a * f) / ad_bc];
      }
    });
    ctx.save = function ctxSave() {
      var old = this._transformMatrix;
      this._transformStack.push(old);
      this._transformMatrix = old.slice(0, 6);
      this._originalSave();
    };
    ctx.restore = function ctxRestore() {
      var prev = this._transformStack.pop();
      if (prev) {
        this._transformMatrix = prev;
        this._originalRestore();
      }
    };
    ctx.translate = function ctxTranslate(x, y) {
      var m = this._transformMatrix;
      m[4] = m[0] * x + m[2] * y + m[4];
      m[5] = m[1] * x + m[3] * y + m[5];
      this._originalTranslate(x, y);
    };
    ctx.scale = function ctxScale(x, y) {
      var m = this._transformMatrix;
      m[0] = m[0] * x;
      m[1] = m[1] * x;
      m[2] = m[2] * y;
      m[3] = m[3] * y;
      this._originalScale(x, y);
    };
    ctx.transform = function ctxTransform(a, b, c, d, e, f) {
      var m = this._transformMatrix;
      this._transformMatrix = [m[0] * a + m[2] * b, m[1] * a + m[3] * b, m[0] * c + m[2] * d, m[1] * c + m[3] * d, m[0] * e + m[2] * f + m[4], m[1] * e + m[3] * f + m[5]];
      ctx._originalTransform(a, b, c, d, e, f);
    };
    ctx.setTransform = function ctxSetTransform(a, b, c, d, e, f) {
      this._transformMatrix = [a, b, c, d, e, f];
      ctx._originalSetTransform(a, b, c, d, e, f);
    };
    ctx.rotate = function ctxRotate(angle) {
      var cosValue = Math.cos(angle);
      var sinValue = Math.sin(angle);
      var m = this._transformMatrix;
      this._transformMatrix = [m[0] * cosValue + m[2] * sinValue, m[1] * cosValue + m[3] * sinValue, m[0] * -sinValue + m[2] * cosValue, m[1] * -sinValue + m[3] * cosValue, m[4], m[5]];
      this._originalRotate(angle);
    };
  }
}
var CachedCanvases = function CachedCanvasesClosure() {
  function CachedCanvases(canvasFactory) {
    this.canvasFactory = canvasFactory;
    this.cache = Object.create(null);
  }
  CachedCanvases.prototype = {
    getCanvas: function CachedCanvases_getCanvas(id, width, height, trackTransform) {
      var canvasEntry;
      if (this.cache[id] !== undefined) {
        canvasEntry = this.cache[id];
        this.canvasFactory.reset(canvasEntry, width, height);
        canvasEntry.context.setTransform(1, 0, 0, 1, 0, 0);
      } else {
        canvasEntry = this.canvasFactory.create(width, height);
        this.cache[id] = canvasEntry;
      }
      if (trackTransform) {
        addContextCurrentTransform(canvasEntry.context);
      }
      return canvasEntry;
    },
    clear: function () {
      for (var id in this.cache) {
        var canvasEntry = this.cache[id];
        this.canvasFactory.destroy(canvasEntry);
        delete this.cache[id];
      }
    }
  };
  return CachedCanvases;
}();
function compileType3Glyph(imgData) {
  var POINT_TO_PROCESS_LIMIT = 1000;
  var width = imgData.width,
      height = imgData.height;
  var i,
      j,
      j0,
      width1 = width + 1;
  var points = new Uint8Array(width1 * (height + 1));
  var POINT_TYPES = new Uint8Array([0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0]);
  var lineSize = width + 7 & ~7,
      data0 = imgData.data;
  var data = new Uint8Array(lineSize * height),
      pos = 0,
      ii;
  for (i = 0, ii = data0.length; i < ii; i++) {
    var mask = 128,
        elem = data0[i];
    while (mask > 0) {
      data[pos++] = elem & mask ? 0 : 255;
      mask >>= 1;
    }
  }
  var count = 0;
  pos = 0;
  if (data[pos] !== 0) {
    points[0] = 1;
    ++count;
  }
  for (j = 1; j < width; j++) {
    if (data[pos] !== data[pos + 1]) {
      points[j] = data[pos] ? 2 : 1;
      ++count;
    }
    pos++;
  }
  if (data[pos] !== 0) {
    points[j] = 2;
    ++count;
  }
  for (i = 1; i < height; i++) {
    pos = i * lineSize;
    j0 = i * width1;
    if (data[pos - lineSize] !== data[pos]) {
      points[j0] = data[pos] ? 1 : 8;
      ++count;
    }
    var sum = (data[pos] ? 4 : 0) + (data[pos - lineSize] ? 8 : 0);
    for (j = 1; j < width; j++) {
      sum = (sum >> 2) + (data[pos + 1] ? 4 : 0) + (data[pos - lineSize + 1] ? 8 : 0);
      if (POINT_TYPES[sum]) {
        points[j0 + j] = POINT_TYPES[sum];
        ++count;
      }
      pos++;
    }
    if (data[pos - lineSize] !== data[pos]) {
      points[j0 + j] = data[pos] ? 2 : 4;
      ++count;
    }
    if (count > POINT_TO_PROCESS_LIMIT) {
      return null;
    }
  }
  pos = lineSize * (height - 1);
  j0 = i * width1;
  if (data[pos] !== 0) {
    points[j0] = 8;
    ++count;
  }
  for (j = 1; j < width; j++) {
    if (data[pos] !== data[pos + 1]) {
      points[j0 + j] = data[pos] ? 4 : 8;
      ++count;
    }
    pos++;
  }
  if (data[pos] !== 0) {
    points[j0 + j] = 4;
    ++count;
  }
  if (count > POINT_TO_PROCESS_LIMIT) {
    return null;
  }
  var steps = new Int32Array([0, width1, -1, 0, -width1, 0, 0, 0, 1]);
  var outlines = [];
  for (i = 0; count && i <= height; i++) {
    var p = i * width1;
    var end = p + width;
    while (p < end && !points[p]) {
      p++;
    }
    if (p === end) {
      continue;
    }
    var coords = [p % width1, i];
    var type = points[p],
        p0 = p,
        pp;
    do {
      var step = steps[type];
      do {
        p += step;
      } while (!points[p]);
      pp = points[p];
      if (pp !== 5 && pp !== 10) {
        type = pp;
        points[p] = 0;
      } else {
        type = pp & 0x33 * type >> 4;
        points[p] &= type >> 2 | type << 2;
      }
      coords.push(p % width1);
      coords.push(p / width1 | 0);
      --count;
    } while (p0 !== p);
    outlines.push(coords);
    --i;
  }
  var drawOutline = function (c) {
    c.save();
    c.scale(1 / width, -1 / height);
    c.translate(0, -height);
    c.beginPath();
    for (var i = 0, ii = outlines.length; i < ii; i++) {
      var o = outlines[i];
      c.moveTo(o[0], o[1]);
      for (var j = 2, jj = o.length; j < jj; j += 2) {
        c.lineTo(o[j], o[j + 1]);
      }
    }
    c.fill();
    c.beginPath();
    c.restore();
  };
  return drawOutline;
}
var CanvasExtraState = function CanvasExtraStateClosure() {
  function CanvasExtraState(old) {
    this.alphaIsShape = false;
    this.fontSize = 0;
    this.fontSizeScale = 1;
    this.textMatrix = IDENTITY_MATRIX;
    this.textMatrixScale = 1;
    this.fontMatrix = FONT_IDENTITY_MATRIX;
    this.leading = 0;
    this.x = 0;
    this.y = 0;
    this.lineX = 0;
    this.lineY = 0;
    this.charSpacing = 0;
    this.wordSpacing = 0;
    this.textHScale = 1;
    this.textRenderingMode = TextRenderingMode.FILL;
    this.textRise = 0;
    this.fillColor = '#000000';
    this.strokeColor = '#000000';
    this.patternFill = false;
    this.fillAlpha = 1;
    this.strokeAlpha = 1;
    this.lineWidth = 1;
    this.activeSMask = null;
    this.resumeSMaskCtx = null;
    this.old = old;
  }
  CanvasExtraState.prototype = {
    clone: function CanvasExtraState_clone() {
      return Object.create(this);
    },
    setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {
      this.x = x;
      this.y = y;
    }
  };
  return CanvasExtraState;
}();
var CanvasGraphics = function CanvasGraphicsClosure() {
  var EXECUTION_TIME = 15;
  var EXECUTION_STEPS = 10;
  function CanvasGraphics(canvasCtx, commonObjs, objs, canvasFactory, imageLayer) {
    this.ctx = canvasCtx;
    this.current = new CanvasExtraState();
    this.stateStack = [];
    this.pendingClip = null;
    this.pendingEOFill = false;
    this.res = null;
    this.xobjs = null;
    this.commonObjs = commonObjs;
    this.objs = objs;
    this.canvasFactory = canvasFactory;
    this.imageLayer = imageLayer;
    this.groupStack = [];
    this.processingType3 = null;
    this.baseTransform = null;
    this.baseTransformStack = [];
    this.groupLevel = 0;
    this.smaskStack = [];
    this.smaskCounter = 0;
    this.tempSMask = null;
    this.cachedCanvases = new CachedCanvases(this.canvasFactory);
    if (canvasCtx) {
      addContextCurrentTransform(canvasCtx);
    }
    this.cachedGetSinglePixelWidth = null;
  }
  function putBinaryImageData(ctx, imgData) {
    if (typeof ImageData !== 'undefined' && imgData instanceof ImageData) {
      ctx.putImageData(imgData, 0, 0);
      return;
    }
    var height = imgData.height,
        width = imgData.width;
    var partialChunkHeight = height % FULL_CHUNK_HEIGHT;
    var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;
    var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;
    var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);
    var srcPos = 0,
        destPos;
    var src = imgData.data;
    var dest = chunkImgData.data;
    var i, j, thisChunkHeight, elemsInThisChunk;
    if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {
      var srcLength = src.byteLength;
      var dest32 = HasCanvasTypedArraysCached.value ? new Uint32Array(dest.buffer) : new Uint32ArrayView(dest);
      var dest32DataLength = dest32.length;
      var fullSrcDiff = width + 7 >> 3;
      var white = 0xFFFFFFFF;
      var black = IsLittleEndianCached.value || !HasCanvasTypedArraysCached.value ? 0xFF000000 : 0x000000FF;
      for (i = 0; i < totalChunks; i++) {
        thisChunkHeight = i < fullChunks ? FULL_CHUNK_HEIGHT : partialChunkHeight;
        destPos = 0;
        for (j = 0; j < thisChunkHeight; j++) {
          var srcDiff = srcLength - srcPos;
          var k = 0;
          var kEnd = srcDiff > fullSrcDiff ? width : srcDiff * 8 - 7;
          var kEndUnrolled = kEnd & ~7;
          var mask = 0;
          var srcByte = 0;
          for (; k < kEndUnrolled; k += 8) {
            srcByte = src[srcPos++];
            dest32[destPos++] = srcByte & 128 ? white : black;
            dest32[destPos++] = srcByte & 64 ? white : black;
            dest32[destPos++] = srcByte & 32 ? white : black;
            dest32[destPos++] = srcByte & 16 ? white : black;
            dest32[destPos++] = srcByte & 8 ? white : black;
            dest32[destPos++] = srcByte & 4 ? white : black;
            dest32[destPos++] = srcByte & 2 ? white : black;
            dest32[destPos++] = srcByte & 1 ? white : black;
          }
          for (; k < kEnd; k++) {
            if (mask === 0) {
              srcByte = src[srcPos++];
              mask = 128;
            }
            dest32[destPos++] = srcByte & mask ? white : black;
            mask >>= 1;
          }
        }
        while (destPos < dest32DataLength) {
          dest32[destPos++] = 0;
        }
        ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
      }
    } else if (imgData.kind === ImageKind.RGBA_32BPP) {
      j = 0;
      elemsInThisChunk = width * FULL_CHUNK_HEIGHT * 4;
      for (i = 0; i < fullChunks; i++) {
        dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));
        srcPos += elemsInThisChunk;
        ctx.putImageData(chunkImgData, 0, j);
        j += FULL_CHUNK_HEIGHT;
      }
      if (i < totalChunks) {
        elemsInThisChunk = width * partialChunkHeight * 4;
        dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));
        ctx.putImageData(chunkImgData, 0, j);
      }
    } else if (imgData.kind === ImageKind.RGB_24BPP) {
      thisChunkHeight = FULL_CHUNK_HEIGHT;
      elemsInThisChunk = width * thisChunkHeight;
      for (i = 0; i < totalChunks; i++) {
        if (i >= fullChunks) {
          thisChunkHeight = partialChunkHeight;
          elemsInThisChunk = width * thisChunkHeight;
        }
        destPos = 0;
        for (j = elemsInThisChunk; j--;) {
          dest[destPos++] = src[srcPos++];
          dest[destPos++] = src[srcPos++];
          dest[destPos++] = src[srcPos++];
          dest[destPos++] = 255;
        }
        ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
      }
    } else {
      error('bad image kind: ' + imgData.kind);
    }
  }
  function putBinaryImageMask(ctx, imgData) {
    var height = imgData.height,
        width = imgData.width;
    var partialChunkHeight = height % FULL_CHUNK_HEIGHT;
    var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;
    var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;
    var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);
    var srcPos = 0;
    var src = imgData.data;
    var dest = chunkImgData.data;
    for (var i = 0; i < totalChunks; i++) {
      var thisChunkHeight = i < fullChunks ? FULL_CHUNK_HEIGHT : partialChunkHeight;
      var destPos = 3;
      for (var j = 0; j < thisChunkHeight; j++) {
        var mask = 0;
        for (var k = 0; k < width; k++) {
          if (!mask) {
            var elem = src[srcPos++];
            mask = 128;
          }
          dest[destPos] = elem & mask ? 0 : 255;
          destPos += 4;
          mask >>= 1;
        }
      }
      ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
    }
  }
  function copyCtxState(sourceCtx, destCtx) {
    var properties = ['strokeStyle', 'fillStyle', 'fillRule', 'globalAlpha', 'lineWidth', 'lineCap', 'lineJoin', 'miterLimit', 'globalCompositeOperation', 'font'];
    for (var i = 0, ii = properties.length; i < ii; i++) {
      var property = properties[i];
      if (sourceCtx[property] !== undefined) {
        destCtx[property] = sourceCtx[property];
      }
    }
    if (sourceCtx.setLineDash !== undefined) {
      destCtx.setLineDash(sourceCtx.getLineDash());
      destCtx.lineDashOffset = sourceCtx.lineDashOffset;
    }
  }
  function composeSMaskBackdrop(bytes, r0, g0, b0) {
    var length = bytes.length;
    for (var i = 3; i < length; i += 4) {
      var alpha = bytes[i];
      if (alpha === 0) {
        bytes[i - 3] = r0;
        bytes[i - 2] = g0;
        bytes[i - 1] = b0;
      } else if (alpha < 255) {
        var alpha_ = 255 - alpha;
        bytes[i - 3] = bytes[i - 3] * alpha + r0 * alpha_ >> 8;
        bytes[i - 2] = bytes[i - 2] * alpha + g0 * alpha_ >> 8;
        bytes[i - 1] = bytes[i - 1] * alpha + b0 * alpha_ >> 8;
      }
    }
  }
  function composeSMaskAlpha(maskData, layerData, transferMap) {
    var length = maskData.length;
    var scale = 1 / 255;
    for (var i = 3; i < length; i += 4) {
      var alpha = transferMap ? transferMap[maskData[i]] : maskData[i];
      layerData[i] = layerData[i] * alpha * scale | 0;
    }
  }
  function composeSMaskLuminosity(maskData, layerData, transferMap) {
    var length = maskData.length;
    for (var i = 3; i < length; i += 4) {
      var y = maskData[i - 3] * 77 + maskData[i - 2] * 152 + maskData[i - 1] * 28;
      layerData[i] = transferMap ? layerData[i] * transferMap[y >> 8] >> 8 : layerData[i] * y >> 16;
    }
  }
  function genericComposeSMask(maskCtx, layerCtx, width, height, subtype, backdrop, transferMap) {
    var hasBackdrop = !!backdrop;
    var r0 = hasBackdrop ? backdrop[0] : 0;
    var g0 = hasBackdrop ? backdrop[1] : 0;
    var b0 = hasBackdrop ? backdrop[2] : 0;
    var composeFn;
    if (subtype === 'Luminosity') {
      composeFn = composeSMaskLuminosity;
    } else {
      composeFn = composeSMaskAlpha;
    }
    var PIXELS_TO_PROCESS = 1048576;
    var chunkSize = Math.min(height, Math.ceil(PIXELS_TO_PROCESS / width));
    for (var row = 0; row < height; row += chunkSize) {
      var chunkHeight = Math.min(chunkSize, height - row);
      var maskData = maskCtx.getImageData(0, row, width, chunkHeight);
      var layerData = layerCtx.getImageData(0, row, width, chunkHeight);
      if (hasBackdrop) {
        composeSMaskBackdrop(maskData.data, r0, g0, b0);
      }
      composeFn(maskData.data, layerData.data, transferMap);
      maskCtx.putImageData(layerData, 0, row);
    }
  }
  function composeSMask(ctx, smask, layerCtx) {
    var mask = smask.canvas;
    var maskCtx = smask.context;
    ctx.setTransform(smask.scaleX, 0, 0, smask.scaleY, smask.offsetX, smask.offsetY);
    var backdrop = smask.backdrop || null;
    if (!smask.transferMap && WebGLUtils.isEnabled) {
      var composed = WebGLUtils.composeSMask(layerCtx.canvas, mask, {
        subtype: smask.subtype,
        backdrop: backdrop
      });
      ctx.setTransform(1, 0, 0, 1, 0, 0);
      ctx.drawImage(composed, smask.offsetX, smask.offsetY);
      return;
    }
    genericComposeSMask(maskCtx, layerCtx, mask.width, mask.height, smask.subtype, backdrop, smask.transferMap);
    ctx.drawImage(mask, 0, 0);
  }
  var LINE_CAP_STYLES = ['butt', 'round', 'square'];
  var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
  var NORMAL_CLIP = {};
  var EO_CLIP = {};
  CanvasGraphics.prototype = {
    beginDrawing: function CanvasGraphics_beginDrawing(transform, viewport, transparency) {
      var width = this.ctx.canvas.width;
      var height = this.ctx.canvas.height;
      this.ctx.save();
      this.ctx.fillStyle = 'rgb(255, 255, 255)';
      this.ctx.fillRect(0, 0, width, height);
      this.ctx.restore();
      if (transparency) {
        var transparentCanvas = this.cachedCanvases.getCanvas('transparent', width, height, true);
        this.compositeCtx = this.ctx;
        this.transparentCanvas = transparentCanvas.canvas;
        this.ctx = transparentCanvas.context;
        this.ctx.save();
        this.ctx.transform.apply(this.ctx, this.compositeCtx.mozCurrentTransform);
      }
      this.ctx.save();
      if (transform) {
        this.ctx.transform.apply(this.ctx, transform);
      }
      this.ctx.transform.apply(this.ctx, viewport.transform);
      this.baseTransform = this.ctx.mozCurrentTransform.slice();
      if (this.imageLayer) {
        this.imageLayer.beginLayout();
      }
    },
    executeOperatorList: function CanvasGraphics_executeOperatorList(operatorList, executionStartIdx, continueCallback, stepper) {
      var argsArray = operatorList.argsArray;
      var fnArray = operatorList.fnArray;
      var i = executionStartIdx || 0;
      var argsArrayLen = argsArray.length;
      if (argsArrayLen === i) {
        return i;
      }
      var chunkOperations = argsArrayLen - i > EXECUTION_STEPS && typeof continueCallback === 'function';
      var endTime = chunkOperations ? Date.now() + EXECUTION_TIME : 0;
      var steps = 0;
      var commonObjs = this.commonObjs;
      var objs = this.objs;
      var fnId;
      while (true) {
        if (stepper !== undefined && i === stepper.nextBreakPoint) {
          stepper.breakIt(i, continueCallback);
          return i;
        }
        fnId = fnArray[i];
        if (fnId !== OPS.dependency) {
          this[fnId].apply(this, argsArray[i]);
        } else {
          var deps = argsArray[i];
          for (var n = 0, nn = deps.length; n < nn; n++) {
            var depObjId = deps[n];
            var common = depObjId[0] === 'g' && depObjId[1] === '_';
            var objsPool = common ? commonObjs : objs;
            if (!objsPool.isResolved(depObjId)) {
              objsPool.get(depObjId, continueCallback);
              return i;
            }
          }
        }
        i++;
        if (i === argsArrayLen) {
          return i;
        }
        if (chunkOperations && ++steps > EXECUTION_STEPS) {
          if (Date.now() > endTime) {
            continueCallback();
            return i;
          }
          steps = 0;
        }
      }
    },
    endDrawing: function CanvasGraphics_endDrawing() {
      if (this.current.activeSMask !== null) {
        this.endSMaskGroup();
      }
      this.ctx.restore();
      if (this.transparentCanvas) {
        this.ctx = this.compositeCtx;
        this.ctx.save();
        this.ctx.setTransform(1, 0, 0, 1, 0, 0);
        this.ctx.drawImage(this.transparentCanvas, 0, 0);
        this.ctx.restore();
        this.transparentCanvas = null;
      }
      this.cachedCanvases.clear();
      WebGLUtils.clear();
      if (this.imageLayer) {
        this.imageLayer.endLayout();
      }
    },
    setLineWidth: function CanvasGraphics_setLineWidth(width) {
      this.current.lineWidth = width;
      this.ctx.lineWidth = width;
    },
    setLineCap: function CanvasGraphics_setLineCap(style) {
      this.ctx.lineCap = LINE_CAP_STYLES[style];
    },
    setLineJoin: function CanvasGraphics_setLineJoin(style) {
      this.ctx.lineJoin = LINE_JOIN_STYLES[style];
    },
    setMiterLimit: function CanvasGraphics_setMiterLimit(limit) {
      this.ctx.miterLimit = limit;
    },
    setDash: function CanvasGraphics_setDash(dashArray, dashPhase) {
      var ctx = this.ctx;
      if (ctx.setLineDash !== undefined) {
        ctx.setLineDash(dashArray);
        ctx.lineDashOffset = dashPhase;
      }
    },
    setRenderingIntent: function CanvasGraphics_setRenderingIntent(intent) {},
    setFlatness: function CanvasGraphics_setFlatness(flatness) {},
    setGState: function CanvasGraphics_setGState(states) {
      for (var i = 0, ii = states.length; i < ii; i++) {
        var state = states[i];
        var key = state[0];
        var value = state[1];
        switch (key) {
          case 'LW':
            this.setLineWidth(value);
            break;
          case 'LC':
            this.setLineCap(value);
            break;
          case 'LJ':
            this.setLineJoin(value);
            break;
          case 'ML':
            this.setMiterLimit(value);
            break;
          case 'D':
            this.setDash(value[0], value[1]);
            break;
          case 'RI':
            this.setRenderingIntent(value);
            break;
          case 'FL':
            this.setFlatness(value);
            break;
          case 'Font':
            this.setFont(value[0], value[1]);
            break;
          case 'CA':
            this.current.strokeAlpha = state[1];
            break;
          case 'ca':
            this.current.fillAlpha = state[1];
            this.ctx.globalAlpha = state[1];
            break;
          case 'BM':
            if (value && value.name && value.name !== 'Normal') {
              var mode = value.name.replace(/([A-Z])/g, function (c) {
                return '-' + c.toLowerCase();
              }).substring(1);
              this.ctx.globalCompositeOperation = mode;
              if (this.ctx.globalCompositeOperation !== mode) {
                warn('globalCompositeOperation "' + mode + '" is not supported');
              }
            } else {
              this.ctx.globalCompositeOperation = 'source-over';
            }
            break;
          case 'SMask':
            if (this.current.activeSMask) {
              if (this.stateStack.length > 0 && this.stateStack[this.stateStack.length - 1].activeSMask === this.current.activeSMask) {
                this.suspendSMaskGroup();
              } else {
                this.endSMaskGroup();
              }
            }
            this.current.activeSMask = value ? this.tempSMask : null;
            if (this.current.activeSMask) {
              this.beginSMaskGroup();
            }
            this.tempSMask = null;
            break;
        }
      }
    },
    beginSMaskGroup: function CanvasGraphics_beginSMaskGroup() {
      var activeSMask = this.current.activeSMask;
      var drawnWidth = activeSMask.canvas.width;
      var drawnHeight = activeSMask.canvas.height;
      var cacheId = 'smaskGroupAt' + this.groupLevel;
      var scratchCanvas = this.cachedCanvases.getCanvas(cacheId, drawnWidth, drawnHeight, true);
      var currentCtx = this.ctx;
      var currentTransform = currentCtx.mozCurrentTransform;
      this.ctx.save();
      var groupCtx = scratchCanvas.context;
      groupCtx.scale(1 / activeSMask.scaleX, 1 / activeSMask.scaleY);
      groupCtx.translate(-activeSMask.offsetX, -activeSMask.offsetY);
      groupCtx.transform.apply(groupCtx, currentTransform);
      activeSMask.startTransformInverse = groupCtx.mozCurrentTransformInverse;
      copyCtxState(currentCtx, groupCtx);
      this.ctx = groupCtx;
      this.setGState([['BM', 'Normal'], ['ca', 1], ['CA', 1]]);
      this.groupStack.push(currentCtx);
      this.groupLevel++;
    },
    suspendSMaskGroup: function CanvasGraphics_endSMaskGroup() {
      var groupCtx = this.ctx;
      this.groupLevel--;
      this.ctx = this.groupStack.pop();
      composeSMask(this.ctx, this.current.activeSMask, groupCtx);
      this.ctx.restore();
      this.ctx.save();
      copyCtxState(groupCtx, this.ctx);
      this.current.resumeSMaskCtx = groupCtx;
      var deltaTransform = Util.transform(this.current.activeSMask.startTransformInverse, groupCtx.mozCurrentTransform);
      this.ctx.transform.apply(this.ctx, deltaTransform);
      groupCtx.save();
      groupCtx.setTransform(1, 0, 0, 1, 0, 0);
      groupCtx.clearRect(0, 0, groupCtx.canvas.width, groupCtx.canvas.height);
      groupCtx.restore();
    },
    resumeSMaskGroup: function CanvasGraphics_endSMaskGroup() {
      var groupCtx = this.current.resumeSMaskCtx;
      var currentCtx = this.ctx;
      this.ctx = groupCtx;
      this.groupStack.push(currentCtx);
      this.groupLevel++;
    },
    endSMaskGroup: function CanvasGraphics_endSMaskGroup() {
      var groupCtx = this.ctx;
      this.groupLevel--;
      this.ctx = this.groupStack.pop();
      composeSMask(this.ctx, this.current.activeSMask, groupCtx);
      this.ctx.restore();
      copyCtxState(groupCtx, this.ctx);
      var deltaTransform = Util.transform(this.current.activeSMask.startTransformInverse, groupCtx.mozCurrentTransform);
      this.ctx.transform.apply(this.ctx, deltaTransform);
    },
    save: function CanvasGraphics_save() {
      this.ctx.save();
      var old = this.current;
      this.stateStack.push(old);
      this.current = old.clone();
      this.current.resumeSMaskCtx = null;
    },
    restore: function CanvasGraphics_restore() {
      if (this.current.resumeSMaskCtx) {
        this.resumeSMaskGroup();
      }
      if (this.current.activeSMask !== null && (this.stateStack.length === 0 || this.stateStack[this.stateStack.length - 1].activeSMask !== this.current.activeSMask)) {
        this.endSMaskGroup();
      }
      if (this.stateStack.length !== 0) {
        this.current = this.stateStack.pop();
        this.ctx.restore();
        this.pendingClip = null;
        this.cachedGetSinglePixelWidth = null;
      }
    },
    transform: function CanvasGraphics_transform(a, b, c, d, e, f) {
      this.ctx.transform(a, b, c, d, e, f);
      this.cachedGetSinglePixelWidth = null;
    },
    constructPath: function CanvasGraphics_constructPath(ops, args) {
      var ctx = this.ctx;
      var current = this.current;
      var x = current.x,
          y = current.y;
      for (var i = 0, j = 0, ii = ops.length; i < ii; i++) {
        switch (ops[i] | 0) {
          case OPS.rectangle:
            x = args[j++];
            y = args[j++];
            var width = args[j++];
            var height = args[j++];
            if (width === 0) {
              width = this.getSinglePixelWidth();
            }
            if (height === 0) {
              height = this.getSinglePixelWidth();
            }
            var xw = x + width;
            var yh = y + height;
            this.ctx.moveTo(x, y);
            this.ctx.lineTo(xw, y);
            this.ctx.lineTo(xw, yh);
            this.ctx.lineTo(x, yh);
            this.ctx.lineTo(x, y);
            this.ctx.closePath();
            break;
          case OPS.moveTo:
            x = args[j++];
            y = args[j++];
            ctx.moveTo(x, y);
            break;
          case OPS.lineTo:
            x = args[j++];
            y = args[j++];
            ctx.lineTo(x, y);
            break;
          case OPS.curveTo:
            x = args[j + 4];
            y = args[j + 5];
            ctx.bezierCurveTo(args[j], args[j + 1], args[j + 2], args[j + 3], x, y);
            j += 6;
            break;
          case OPS.curveTo2:
            ctx.bezierCurveTo(x, y, args[j], args[j + 1], args[j + 2], args[j + 3]);
            x = args[j + 2];
            y = args[j + 3];
            j += 4;
            break;
          case OPS.curveTo3:
            x = args[j + 2];
            y = args[j + 3];
            ctx.bezierCurveTo(args[j], args[j + 1], x, y, x, y);
            j += 4;
            break;
          case OPS.closePath:
            ctx.closePath();
            break;
        }
      }
      current.setCurrentPoint(x, y);
    },
    closePath: function CanvasGraphics_closePath() {
      this.ctx.closePath();
    },
    stroke: function CanvasGraphics_stroke(consumePath) {
      consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
      var ctx = this.ctx;
      var strokeColor = this.current.strokeColor;
      ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR, this.current.lineWidth);
      ctx.globalAlpha = this.current.strokeAlpha;
      if (strokeColor && strokeColor.hasOwnProperty('type') && strokeColor.type === 'Pattern') {
        ctx.save();
        ctx.strokeStyle = strokeColor.getPattern(ctx, this);
        ctx.stroke();
        ctx.restore();
      } else {
        ctx.stroke();
      }
      if (consumePath) {
        this.consumePath();
      }
      ctx.globalAlpha = this.current.fillAlpha;
    },
    closeStroke: function CanvasGraphics_closeStroke() {
      this.closePath();
      this.stroke();
    },
    fill: function CanvasGraphics_fill(consumePath) {
      consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
      var ctx = this.ctx;
      var fillColor = this.current.fillColor;
      var isPatternFill = this.current.patternFill;
      var needRestore = false;
      if (isPatternFill) {
        ctx.save();
        if (this.baseTransform) {
          ctx.setTransform.apply(ctx, this.baseTransform);
        }
        ctx.fillStyle = fillColor.getPattern(ctx, this);
        needRestore = true;
      }
      if (this.pendingEOFill) {
        ctx.fill('evenodd');
        this.pendingEOFill = false;
      } else {
        ctx.fill();
      }
      if (needRestore) {
        ctx.restore();
      }
      if (consumePath) {
        this.consumePath();
      }
    },
    eoFill: function CanvasGraphics_eoFill() {
      this.pendingEOFill = true;
      this.fill();
    },
    fillStroke: function CanvasGraphics_fillStroke() {
      this.fill(false);
      this.stroke(false);
      this.consumePath();
    },
    eoFillStroke: function CanvasGraphics_eoFillStroke() {
      this.pendingEOFill = true;
      this.fillStroke();
    },
    closeFillStroke: function CanvasGraphics_closeFillStroke() {
      this.closePath();
      this.fillStroke();
    },
    closeEOFillStroke: function CanvasGraphics_closeEOFillStroke() {
      this.pendingEOFill = true;
      this.closePath();
      this.fillStroke();
    },
    endPath: function CanvasGraphics_endPath() {
      this.consumePath();
    },
    clip: function CanvasGraphics_clip() {
      this.pendingClip = NORMAL_CLIP;
    },
    eoClip: function CanvasGraphics_eoClip() {
      this.pendingClip = EO_CLIP;
    },
    beginText: function CanvasGraphics_beginText() {
      this.current.textMatrix = IDENTITY_MATRIX;
      this.current.textMatrixScale = 1;
      this.current.x = this.current.lineX = 0;
      this.current.y = this.current.lineY = 0;
    },
    endText: function CanvasGraphics_endText() {
      var paths = this.pendingTextPaths;
      var ctx = this.ctx;
      if (paths === undefined) {
        ctx.beginPath();
        return;
      }
      ctx.save();
      ctx.beginPath();
      for (var i = 0; i < paths.length; i++) {
        var path = paths[i];
        ctx.setTransform.apply(ctx, path.transform);
        ctx.translate(path.x, path.y);
        path.addToPath(ctx, path.fontSize);
      }
      ctx.restore();
      ctx.clip();
      ctx.beginPath();
      delete this.pendingTextPaths;
    },
    setCharSpacing: function CanvasGraphics_setCharSpacing(spacing) {
      this.current.charSpacing = spacing;
    },
    setWordSpacing: function CanvasGraphics_setWordSpacing(spacing) {
      this.current.wordSpacing = spacing;
    },
    setHScale: function CanvasGraphics_setHScale(scale) {
      this.current.textHScale = scale / 100;
    },
    setLeading: function CanvasGraphics_setLeading(leading) {
      this.current.leading = -leading;
    },
    setFont: function CanvasGraphics_setFont(fontRefName, size) {
      var fontObj = this.commonObjs.get(fontRefName);
      var current = this.current;
      if (!fontObj) {
        error('Can\'t find font for ' + fontRefName);
      }
      current.fontMatrix = fontObj.fontMatrix ? fontObj.fontMatrix : FONT_IDENTITY_MATRIX;
      if (current.fontMatrix[0] === 0 || current.fontMatrix[3] === 0) {
        warn('Invalid font matrix for font ' + fontRefName);
      }
      if (size < 0) {
        size = -size;
        current.fontDirection = -1;
      } else {
        current.fontDirection = 1;
      }
      this.current.font = fontObj;
      this.current.fontSize = size;
      if (fontObj.isType3Font) {
        return;
      }
      var name = fontObj.loadedName || 'sans-serif';
      var bold = fontObj.black ? '900' : fontObj.bold ? 'bold' : 'normal';
      var italic = fontObj.italic ? 'italic' : 'normal';
      var typeface = '"' + name + '", ' + fontObj.fallbackName;
      var browserFontSize = size < MIN_FONT_SIZE ? MIN_FONT_SIZE : size > MAX_FONT_SIZE ? MAX_FONT_SIZE : size;
      this.current.fontSizeScale = size / browserFontSize;
      var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
      this.ctx.font = rule;
    },
    setTextRenderingMode: function CanvasGraphics_setTextRenderingMode(mode) {
      this.current.textRenderingMode = mode;
    },
    setTextRise: function CanvasGraphics_setTextRise(rise) {
      this.current.textRise = rise;
    },
    moveText: function CanvasGraphics_moveText(x, y) {
      this.current.x = this.current.lineX += x;
      this.current.y = this.current.lineY += y;
    },
    setLeadingMoveText: function CanvasGraphics_setLeadingMoveText(x, y) {
      this.setLeading(-y);
      this.moveText(x, y);
    },
    setTextMatrix: function CanvasGraphics_setTextMatrix(a, b, c, d, e, f) {
      this.current.textMatrix = [a, b, c, d, e, f];
      this.current.textMatrixScale = Math.sqrt(a * a + b * b);
      this.current.x = this.current.lineX = 0;
      this.current.y = this.current.lineY = 0;
    },
    nextLine: function CanvasGraphics_nextLine() {
      this.moveText(0, this.current.leading);
    },
    paintChar: function CanvasGraphics_paintChar(character, x, y) {
      var ctx = this.ctx;
      var current = this.current;
      var font = current.font;
      var textRenderingMode = current.textRenderingMode;
      var fontSize = current.fontSize / current.fontSizeScale;
      var fillStrokeMode = textRenderingMode & TextRenderingMode.FILL_STROKE_MASK;
      var isAddToPathSet = !!(textRenderingMode & TextRenderingMode.ADD_TO_PATH_FLAG);
      var addToPath;
      if (font.disableFontFace || isAddToPathSet) {
        addToPath = font.getPathGenerator(this.commonObjs, character);
      }
      if (font.disableFontFace) {
        ctx.save();
        ctx.translate(x, y);
        ctx.beginPath();
        addToPath(ctx, fontSize);
        if (fillStrokeMode === TextRenderingMode.FILL || fillStrokeMode === TextRenderingMode.FILL_STROKE) {
          ctx.fill();
        }
        if (fillStrokeMode === TextRenderingMode.STROKE || fillStrokeMode === TextRenderingMode.FILL_STROKE) {
          ctx.stroke();
        }
        ctx.restore();
      } else {
        if (fillStrokeMode === TextRenderingMode.FILL || fillStrokeMode === TextRenderingMode.FILL_STROKE) {
          ctx.fillText(character, x, y);
        }
        if (fillStrokeMode === TextRenderingMode.STROKE || fillStrokeMode === TextRenderingMode.FILL_STROKE) {
          ctx.strokeText(character, x, y);
        }
      }
      if (isAddToPathSet) {
        var paths = this.pendingTextPaths || (this.pendingTextPaths = []);
        paths.push({
          transform: ctx.mozCurrentTransform,
          x: x,
          y: y,
          fontSize: fontSize,
          addToPath: addToPath
        });
      }
    },
    get isFontSubpixelAAEnabled() {
      var ctx = this.canvasFactory.create(10, 10).context;
      ctx.scale(1.5, 1);
      ctx.fillText('I', 0, 10);
      var data = ctx.getImageData(0, 0, 10, 10).data;
      var enabled = false;
      for (var i = 3; i < data.length; i += 4) {
        if (data[i] > 0 && data[i] < 255) {
          enabled = true;
          break;
        }
      }
      return shadow(this, 'isFontSubpixelAAEnabled', enabled);
    },
    showText: function CanvasGraphics_showText(glyphs) {
      var current = this.current;
      var font = current.font;
      if (font.isType3Font) {
        return this.showType3Text(glyphs);
      }
      var fontSize = current.fontSize;
      if (fontSize === 0) {
        return;
      }
      var ctx = this.ctx;
      var fontSizeScale = current.fontSizeScale;
      var charSpacing = current.charSpacing;
      var wordSpacing = current.wordSpacing;
      var fontDirection = current.fontDirection;
      var textHScale = current.textHScale * fontDirection;
      var glyphsLength = glyphs.length;
      var vertical = font.vertical;
      var spacingDir = vertical ? 1 : -1;
      var defaultVMetrics = font.defaultVMetrics;
      var widthAdvanceScale = fontSize * current.fontMatrix[0];
      var simpleFillText = current.textRenderingMode === TextRenderingMode.FILL && !font.disableFontFace;
      ctx.save();
      ctx.transform.apply(ctx, current.textMatrix);
      ctx.translate(current.x, current.y + current.textRise);
      if (current.patternFill) {
        ctx.fillStyle = current.fillColor.getPattern(ctx, this);
      }
      if (fontDirection > 0) {
        ctx.scale(textHScale, -1);
      } else {
        ctx.scale(textHScale, 1);
      }
      var lineWidth = current.lineWidth;
      var scale = current.textMatrixScale;
      if (scale === 0 || lineWidth === 0) {
        var fillStrokeMode = current.textRenderingMode & TextRenderingMode.FILL_STROKE_MASK;
        if (fillStrokeMode === TextRenderingMode.STROKE || fillStrokeMode === TextRenderingMode.FILL_STROKE) {
          this.cachedGetSinglePixelWidth = null;
          lineWidth = this.getSinglePixelWidth() * MIN_WIDTH_FACTOR;
        }
      } else {
        lineWidth /= scale;
      }
      if (fontSizeScale !== 1.0) {
        ctx.scale(fontSizeScale, fontSizeScale);
        lineWidth /= fontSizeScale;
      }
      ctx.lineWidth = lineWidth;
      var x = 0,
          i;
      for (i = 0; i < glyphsLength; ++i) {
        var glyph = glyphs[i];
        if (isNum(glyph)) {
          x += spacingDir * glyph * fontSize / 1000;
          continue;
        }
        var restoreNeeded = false;
        var spacing = (glyph.isSpace ? wordSpacing : 0) + charSpacing;
        var character = glyph.fontChar;
        var accent = glyph.accent;
        var scaledX, scaledY, scaledAccentX, scaledAccentY;
        var width = glyph.width;
        if (vertical) {
          var vmetric, vx, vy;
          vmetric = glyph.vmetric || defaultVMetrics;
          vx = glyph.vmetric ? vmetric[1] : width * 0.5;
          vx = -vx * widthAdvanceScale;
          vy = vmetric[2] * widthAdvanceScale;
          width = vmetric ? -vmetric[0] : width;
          scaledX = vx / fontSizeScale;
          scaledY = (x + vy) / fontSizeScale;
        } else {
          scaledX = x / fontSizeScale;
          scaledY = 0;
        }
        if (font.remeasure && width > 0) {
          var measuredWidth = ctx.measureText(character).width * 1000 / fontSize * fontSizeScale;
          if (width < measuredWidth && this.isFontSubpixelAAEnabled) {
            var characterScaleX = width / measuredWidth;
            restoreNeeded = true;
            ctx.save();
            ctx.scale(characterScaleX, 1);
            scaledX /= characterScaleX;
          } else if (width !== measuredWidth) {
            scaledX += (width - measuredWidth) / 2000 * fontSize / fontSizeScale;
          }
        }
        if (glyph.isInFont || font.missingFile) {
          if (simpleFillText && !accent) {
            ctx.fillText(character, scaledX, scaledY);
          } else {
            this.paintChar(character, scaledX, scaledY);
            if (accent) {
              scaledAccentX = scaledX + accent.offset.x / fontSizeScale;
              scaledAccentY = scaledY - accent.offset.y / fontSizeScale;
              this.paintChar(accent.fontChar, scaledAccentX, scaledAccentY);
            }
          }
        }
        var charWidth = width * widthAdvanceScale + spacing * fontDirection;
        x += charWidth;
        if (restoreNeeded) {
          ctx.restore();
        }
      }
      if (vertical) {
        current.y -= x * textHScale;
      } else {
        current.x += x * textHScale;
      }
      ctx.restore();
    },
    showType3Text: function CanvasGraphics_showType3Text(glyphs) {
      var ctx = this.ctx;
      var current = this.current;
      var font = current.font;
      var fontSize = current.fontSize;
      var fontDirection = current.fontDirection;
      var spacingDir = font.vertical ? 1 : -1;
      var charSpacing = current.charSpacing;
      var wordSpacing = current.wordSpacing;
      var textHScale = current.textHScale * fontDirection;
      var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
      var glyphsLength = glyphs.length;
      var isTextInvisible = current.textRenderingMode === TextRenderingMode.INVISIBLE;
      var i, glyph, width, spacingLength;
      if (isTextInvisible || fontSize === 0) {
        return;
      }
      this.cachedGetSinglePixelWidth = null;
      ctx.save();
      ctx.transform.apply(ctx, current.textMatrix);
      ctx.translate(current.x, current.y);
      ctx.scale(textHScale, fontDirection);
      for (i = 0; i < glyphsLength; ++i) {
        glyph = glyphs[i];
        if (isNum(glyph)) {
          spacingLength = spacingDir * glyph * fontSize / 1000;
          this.ctx.translate(spacingLength, 0);
          current.x += spacingLength * textHScale;
          continue;
        }
        var spacing = (glyph.isSpace ? wordSpacing : 0) + charSpacing;
        var operatorList = font.charProcOperatorList[glyph.operatorListId];
        if (!operatorList) {
          warn('Type3 character \"' + glyph.operatorListId + '\" is not available');
          continue;
        }
        this.processingType3 = glyph;
        this.save();
        ctx.scale(fontSize, fontSize);
        ctx.transform.apply(ctx, fontMatrix);
        this.executeOperatorList(operatorList);
        this.restore();
        var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);
        width = transformed[0] * fontSize + spacing;
        ctx.translate(width, 0);
        current.x += width * textHScale;
      }
      ctx.restore();
      this.processingType3 = null;
    },
    setCharWidth: function CanvasGraphics_setCharWidth(xWidth, yWidth) {},
    setCharWidthAndBounds: function CanvasGraphics_setCharWidthAndBounds(xWidth, yWidth, llx, lly, urx, ury) {
      this.ctx.rect(llx, lly, urx - llx, ury - lly);
      this.clip();
      this.endPath();
    },
    getColorN_Pattern: function CanvasGraphics_getColorN_Pattern(IR) {
      var pattern;
      if (IR[0] === 'TilingPattern') {
        var color = IR[1];
        var baseTransform = this.baseTransform || this.ctx.mozCurrentTransform.slice();
        var self = this;
        var canvasGraphicsFactory = {
          createCanvasGraphics: function (ctx) {
            return new CanvasGraphics(ctx, self.commonObjs, self.objs, self.canvasFactory);
          }
        };
        pattern = new TilingPattern(IR, color, this.ctx, canvasGraphicsFactory, baseTransform);
      } else {
        pattern = getShadingPatternFromIR(IR);
      }
      return pattern;
    },
    setStrokeColorN: function CanvasGraphics_setStrokeColorN() {
      this.current.strokeColor = this.getColorN_Pattern(arguments);
    },
    setFillColorN: function CanvasGraphics_setFillColorN() {
      this.current.fillColor = this.getColorN_Pattern(arguments);
      this.current.patternFill = true;
    },
    setStrokeRGBColor: function CanvasGraphics_setStrokeRGBColor(r, g, b) {
      var color = Util.makeCssRgb(r, g, b);
      this.ctx.strokeStyle = color;
      this.current.strokeColor = color;
    },
    setFillRGBColor: function CanvasGraphics_setFillRGBColor(r, g, b) {
      var color = Util.makeCssRgb(r, g, b);
      this.ctx.fillStyle = color;
      this.current.fillColor = color;
      this.current.patternFill = false;
    },
    shadingFill: function CanvasGraphics_shadingFill(patternIR) {
      var ctx = this.ctx;
      this.save();
      var pattern = getShadingPatternFromIR(patternIR);
      ctx.fillStyle = pattern.getPattern(ctx, this, true);
      var inv = ctx.mozCurrentTransformInverse;
      if (inv) {
        var canvas = ctx.canvas;
        var width = canvas.width;
        var height = canvas.height;
        var bl = Util.applyTransform([0, 0], inv);
        var br = Util.applyTransform([0, height], inv);
        var ul = Util.applyTransform([width, 0], inv);
        var ur = Util.applyTransform([width, height], inv);
        var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
        var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
        var x1 = Math.max(bl[0], br[0], ul[0], ur[0]);
        var y1 = Math.max(bl[1], br[1], ul[1], ur[1]);
        this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);
      } else {
        this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
      }
      this.restore();
    },
    beginInlineImage: function CanvasGraphics_beginInlineImage() {
      error('Should not call beginInlineImage');
    },
    beginImageData: function CanvasGraphics_beginImageData() {
      error('Should not call beginImageData');
    },
    paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(matrix, bbox) {
      this.save();
      this.baseTransformStack.push(this.baseTransform);
      if (isArray(matrix) && matrix.length === 6) {
        this.transform.apply(this, matrix);
      }
      this.baseTransform = this.ctx.mozCurrentTransform;
      if (isArray(bbox) && bbox.length === 4) {
        var width = bbox[2] - bbox[0];
        var height = bbox[3] - bbox[1];
        this.ctx.rect(bbox[0], bbox[1], width, height);
        this.clip();
        this.endPath();
      }
    },
    paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {
      this.restore();
      this.baseTransform = this.baseTransformStack.pop();
    },
    beginGroup: function CanvasGraphics_beginGroup(group) {
      this.save();
      var currentCtx = this.ctx;
      if (!group.isolated) {
        info('TODO: Support non-isolated groups.');
      }
      if (group.knockout) {
        warn('Knockout groups not supported.');
      }
      var currentTransform = currentCtx.mozCurrentTransform;
      if (group.matrix) {
        currentCtx.transform.apply(currentCtx, group.matrix);
      }
      assert(group.bbox, 'Bounding box is required.');
      var bounds = Util.getAxialAlignedBoundingBox(group.bbox, currentCtx.mozCurrentTransform);
      var canvasBounds = [0, 0, currentCtx.canvas.width, currentCtx.canvas.height];
      bounds = Util.intersect(bounds, canvasBounds) || [0, 0, 0, 0];
      var offsetX = Math.floor(bounds[0]);
      var offsetY = Math.floor(bounds[1]);
      var drawnWidth = Math.max(Math.ceil(bounds[2]) - offsetX, 1);
      var drawnHeight = Math.max(Math.ceil(bounds[3]) - offsetY, 1);
      var scaleX = 1,
          scaleY = 1;
      if (drawnWidth > MAX_GROUP_SIZE) {
        scaleX = drawnWidth / MAX_GROUP_SIZE;
        drawnWidth = MAX_GROUP_SIZE;
      }
      if (drawnHeight > MAX_GROUP_SIZE) {
        scaleY = drawnHeight / MAX_GROUP_SIZE;
        drawnHeight = MAX_GROUP_SIZE;
      }
      var cacheId = 'groupAt' + this.groupLevel;
      if (group.smask) {
        cacheId += '_smask_' + this.smaskCounter++ % 2;
      }
      var scratchCanvas = this.cachedCanvases.getCanvas(cacheId, drawnWidth, drawnHeight, true);
      var groupCtx = scratchCanvas.context;
      groupCtx.scale(1 / scaleX, 1 / scaleY);
      groupCtx.translate(-offsetX, -offsetY);
      groupCtx.transform.apply(groupCtx, currentTransform);
      if (group.smask) {
        this.smaskStack.push({
          canvas: scratchCanvas.canvas,
          context: groupCtx,
          offsetX: offsetX,
          offsetY: offsetY,
          scaleX: scaleX,
          scaleY: scaleY,
          subtype: group.smask.subtype,
          backdrop: group.smask.backdrop,
          transferMap: group.smask.transferMap || null,
          startTransformInverse: null
        });
      } else {
        currentCtx.setTransform(1, 0, 0, 1, 0, 0);
        currentCtx.translate(offsetX, offsetY);
        currentCtx.scale(scaleX, scaleY);
      }
      copyCtxState(currentCtx, groupCtx);
      this.ctx = groupCtx;
      this.setGState([['BM', 'Normal'], ['ca', 1], ['CA', 1]]);
      this.groupStack.push(currentCtx);
      this.groupLevel++;
      this.current.activeSMask = null;
    },
    endGroup: function CanvasGraphics_endGroup(group) {
      this.groupLevel--;
      var groupCtx = this.ctx;
      this.ctx = this.groupStack.pop();
      if (this.ctx.imageSmoothingEnabled !== undefined) {
        this.ctx.imageSmoothingEnabled = false;
      } else {
        this.ctx.mozImageSmoothingEnabled = false;
      }
      if (group.smask) {
        this.tempSMask = this.smaskStack.pop();
      } else {
        this.ctx.drawImage(groupCtx.canvas, 0, 0);
      }
      this.restore();
    },
    beginAnnotations: function CanvasGraphics_beginAnnotations() {
      this.save();
      this.current = new CanvasExtraState();
      if (this.baseTransform) {
        this.ctx.setTransform.apply(this.ctx, this.baseTransform);
      }
    },
    endAnnotations: function CanvasGraphics_endAnnotations() {
      this.restore();
    },
    beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform, matrix) {
      this.save();
      if (isArray(rect) && rect.length === 4) {
        var width = rect[2] - rect[0];
        var height = rect[3] - rect[1];
        this.ctx.rect(rect[0], rect[1], width, height);
        this.clip();
        this.endPath();
      }
      this.transform.apply(this, transform);
      this.transform.apply(this, matrix);
    },
    endAnnotation: function CanvasGraphics_endAnnotation() {
      this.restore();
    },
    paintJpegXObject: function CanvasGraphics_paintJpegXObject(objId, w, h) {
      var domImage = this.objs.get(objId);
      if (!domImage) {
        warn('Dependent image isn\'t ready yet');
        return;
      }
      this.save();
      var ctx = this.ctx;
      ctx.scale(1 / w, -1 / h);
      ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height, 0, -h, w, h);
      if (this.imageLayer) {
        var currentTransform = ctx.mozCurrentTransformInverse;
        var position = this.getCanvasPosition(0, 0);
        this.imageLayer.appendImage({
          objId: objId,
          left: position[0],
          top: position[1],
          width: w / currentTransform[0],
          height: h / currentTransform[3]
        });
      }
      this.restore();
    },
    paintImageMaskXObject: function CanvasGraphics_paintImageMaskXObject(img) {
      var ctx = this.ctx;
      var width = img.width,
          height = img.height;
      var fillColor = this.current.fillColor;
      var isPatternFill = this.current.patternFill;
      var glyph = this.processingType3;
      if (COMPILE_TYPE3_GLYPHS && glyph && glyph.compiled === undefined) {
        if (width <= MAX_SIZE_TO_COMPILE && height <= MAX_SIZE_TO_COMPILE) {
          glyph.compiled = compileType3Glyph({
            data: img.data,
            width: width,
            height: height
          });
        } else {
          glyph.compiled = null;
        }
      }
      if (glyph && glyph.compiled) {
        glyph.compiled(ctx);
        return;
      }
      var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas', width, height);
      var maskCtx = maskCanvas.context;
      maskCtx.save();
      putBinaryImageMask(maskCtx, img);
      maskCtx.globalCompositeOperation = 'source-in';
      maskCtx.fillStyle = isPatternFill ? fillColor.getPattern(maskCtx, this) : fillColor;
      maskCtx.fillRect(0, 0, width, height);
      maskCtx.restore();
      this.paintInlineImageXObject(maskCanvas.canvas);
    },
    paintImageMaskXObjectRepeat: function CanvasGraphics_paintImageMaskXObjectRepeat(imgData, scaleX, scaleY, positions) {
      var width = imgData.width;
      var height = imgData.height;
      var fillColor = this.current.fillColor;
      var isPatternFill = this.current.patternFill;
      var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas', width, height);
      var maskCtx = maskCanvas.context;
      maskCtx.save();
      putBinaryImageMask(maskCtx, imgData);
      maskCtx.globalCompositeOperation = 'source-in';
      maskCtx.fillStyle = isPatternFill ? fillColor.getPattern(maskCtx, this) : fillColor;
      maskCtx.fillRect(0, 0, width, height);
      maskCtx.restore();
      var ctx = this.ctx;
      for (var i = 0, ii = positions.length; i < ii; i += 2) {
        ctx.save();
        ctx.transform(scaleX, 0, 0, scaleY, positions[i], positions[i + 1]);
        ctx.scale(1, -1);
        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height, 0, -1, 1, 1);
        ctx.restore();
      }
    },
    paintImageMaskXObjectGroup: function CanvasGraphics_paintImageMaskXObjectGroup(images) {
      var ctx = this.ctx;
      var fillColor = this.current.fillColor;
      var isPatternFill = this.current.patternFill;
      for (var i = 0, ii = images.length; i < ii; i++) {
        var image = images[i];
        var width = image.width,
            height = image.height;
        var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas', width, height);
        var maskCtx = maskCanvas.context;
        maskCtx.save();
        putBinaryImageMask(maskCtx, image);
        maskCtx.globalCompositeOperation = 'source-in';
        maskCtx.fillStyle = isPatternFill ? fillColor.getPattern(maskCtx, this) : fillColor;
        maskCtx.fillRect(0, 0, width, height);
        maskCtx.restore();
        ctx.save();
        ctx.transform.apply(ctx, image.transform);
        ctx.scale(1, -1);
        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height, 0, -1, 1, 1);
        ctx.restore();
      }
    },
    paintImageXObject: function CanvasGraphics_paintImageXObject(objId) {
      var imgData = this.objs.get(objId);
      if (!imgData) {
        warn('Dependent image isn\'t ready yet');
        return;
      }
      this.paintInlineImageXObject(imgData);
    },
    paintImageXObjectRepeat: function CanvasGraphics_paintImageXObjectRepeat(objId, scaleX, scaleY, positions) {
      var imgData = this.objs.get(objId);
      if (!imgData) {
        warn('Dependent image isn\'t ready yet');
        return;
      }
      var width = imgData.width;
      var height = imgData.height;
      var map = [];
      for (var i = 0, ii = positions.length; i < ii; i += 2) {
        map.push({
          transform: [scaleX, 0, 0, scaleY, positions[i], positions[i + 1]],
          x: 0,
          y: 0,
          w: width,
          h: height
        });
      }
      this.paintInlineImageXObjectGroup(imgData, map);
    },
    paintInlineImageXObject: function CanvasGraphics_paintInlineImageXObject(imgData) {
      var width = imgData.width;
      var height = imgData.height;
      var ctx = this.ctx;
      this.save();
      ctx.scale(1 / width, -1 / height);
      var currentTransform = ctx.mozCurrentTransformInverse;
      var a = currentTransform[0],
          b = currentTransform[1];
      var widthScale = Math.max(Math.sqrt(a * a + b * b), 1);
      var c = currentTransform[2],
          d = currentTransform[3];
      var heightScale = Math.max(Math.sqrt(c * c + d * d), 1);
      var imgToPaint, tmpCanvas;
      if (imgData instanceof HTMLElement || !imgData.data) {
        imgToPaint = imgData;
      } else {
        tmpCanvas = this.cachedCanvases.getCanvas('inlineImage', width, height);
        var tmpCtx = tmpCanvas.context;
        putBinaryImageData(tmpCtx, imgData);
        imgToPaint = tmpCanvas.canvas;
      }
      var paintWidth = width,
          paintHeight = height;
      var tmpCanvasId = 'prescale1';
      while (widthScale > 2 && paintWidth > 1 || heightScale > 2 && paintHeight > 1) {
        var newWidth = paintWidth,
            newHeight = paintHeight;
        if (widthScale > 2 && paintWidth > 1) {
          newWidth = Math.ceil(paintWidth / 2);
          widthScale /= paintWidth / newWidth;
        }
        if (heightScale > 2 && paintHeight > 1) {
          newHeight = Math.ceil(paintHeight / 2);
          heightScale /= paintHeight / newHeight;
        }
        tmpCanvas = this.cachedCanvases.getCanvas(tmpCanvasId, newWidth, newHeight);
        tmpCtx = tmpCanvas.context;
        tmpCtx.clearRect(0, 0, newWidth, newHeight);
        tmpCtx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight, 0, 0, newWidth, newHeight);
        imgToPaint = tmpCanvas.canvas;
        paintWidth = newWidth;
        paintHeight = newHeight;
        tmpCanvasId = tmpCanvasId === 'prescale1' ? 'prescale2' : 'prescale1';
      }
      ctx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight, 0, -height, width, height);
      if (this.imageLayer) {
        var position = this.getCanvasPosition(0, -height);
        this.imageLayer.appendImage({
          imgData: imgData,
          left: position[0],
          top: position[1],
          width: width / currentTransform[0],
          height: height / currentTransform[3]
        });
      }
      this.restore();
    },
    paintInlineImageXObjectGroup: function CanvasGraphics_paintInlineImageXObjectGroup(imgData, map) {
      var ctx = this.ctx;
      var w = imgData.width;
      var h = imgData.height;
      var tmpCanvas = this.cachedCanvases.getCanvas('inlineImage', w, h);
      var tmpCtx = tmpCanvas.context;
      putBinaryImageData(tmpCtx, imgData);
      for (var i = 0, ii = map.length; i < ii; i++) {
        var entry = map[i];
        ctx.save();
        ctx.transform.apply(ctx, entry.transform);
        ctx.scale(1, -1);
        ctx.drawImage(tmpCanvas.canvas, entry.x, entry.y, entry.w, entry.h, 0, -1, 1, 1);
        if (this.imageLayer) {
          var position = this.getCanvasPosition(entry.x, entry.y);
          this.imageLayer.appendImage({
            imgData: imgData,
            left: position[0],
            top: position[1],
            width: w,
            height: h
          });
        }
        ctx.restore();
      }
    },
    paintSolidColorImageMask: function CanvasGraphics_paintSolidColorImageMask() {
      this.ctx.fillRect(0, 0, 1, 1);
    },
    paintXObject: function CanvasGraphics_paintXObject() {
      warn('Unsupported \'paintXObject\' command.');
    },
    markPoint: function CanvasGraphics_markPoint(tag) {},
    markPointProps: function CanvasGraphics_markPointProps(tag, properties) {},
    beginMarkedContent: function CanvasGraphics_beginMarkedContent(tag) {},
    beginMarkedContentProps: function CanvasGraphics_beginMarkedContentProps(tag, properties) {},
    endMarkedContent: function CanvasGraphics_endMarkedContent() {},
    beginCompat: function CanvasGraphics_beginCompat() {},
    endCompat: function CanvasGraphics_endCompat() {},
    consumePath: function CanvasGraphics_consumePath() {
      var ctx = this.ctx;
      if (this.pendingClip) {
        if (this.pendingClip === EO_CLIP) {
          ctx.clip('evenodd');
        } else {
          ctx.clip();
        }
        this.pendingClip = null;
      }
      ctx.beginPath();
    },
    getSinglePixelWidth: function CanvasGraphics_getSinglePixelWidth(scale) {
      if (this.cachedGetSinglePixelWidth === null) {
        this.ctx.save();
        var inverse = this.ctx.mozCurrentTransformInverse;
        this.ctx.restore();
        this.cachedGetSinglePixelWidth = Math.sqrt(Math.max(inverse[0] * inverse[0] + inverse[1] * inverse[1], inverse[2] * inverse[2] + inverse[3] * inverse[3]));
      }
      return this.cachedGetSinglePixelWidth;
    },
    getCanvasPosition: function CanvasGraphics_getCanvasPosition(x, y) {
      var transform = this.ctx.mozCurrentTransform;
      return [transform[0] * x + transform[2] * y + transform[4], transform[1] * x + transform[3] * y + transform[5]];
    }
  };
  for (var op in OPS) {
    CanvasGraphics.prototype[OPS[op]] = CanvasGraphics.prototype[op];
  }
  return CanvasGraphics;
}();
exports.CanvasGraphics = CanvasGraphics;