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Generic build of PDF.js library.
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pdfjs-dist/src/core/evaluator.js

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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2012 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.
*/
/* globals assert, ColorSpace, DecodeStream, Dict, Encodings,
error, ErrorFont, Font, FONT_IDENTITY_MATRIX, fontCharsToUnicode,
FontFlags, ImageKind, info, isArray, isCmd, isDict, isEOF, isName,
isNum, isStream, isString, JpegStream, Lexer, Metrics,
MurmurHash3_64, Name, Parser, Pattern, PDFImage, PDFJS, serifFonts,
stdFontMap, symbolsFonts, getTilingPatternIR, warn, Util, Promise,
RefSetCache, isRef, TextRenderingMode, CMapFactory, OPS,
UNSUPPORTED_FEATURES, UnsupportedManager, NormalizedUnicodes,
IDENTITY_MATRIX, reverseIfRtl, createPromiseCapability */
'use strict';
var PartialEvaluator = (function PartialEvaluatorClosure() {
function PartialEvaluator(pdfManager, xref, handler, pageIndex,
uniquePrefix, idCounters, fontCache) {
this.pdfManager = pdfManager;
this.xref = xref;
this.handler = handler;
this.pageIndex = pageIndex;
this.uniquePrefix = uniquePrefix;
this.idCounters = idCounters;
this.fontCache = fontCache;
}
// Trying to minimize Date.now() usage and check every 100 time
var TIME_SLOT_DURATION_MS = 20;
var CHECK_TIME_EVERY = 100;
function TimeSlotManager() {
this.reset();
}
TimeSlotManager.prototype = {
check: function TimeSlotManager_check() {
if (++this.checked < CHECK_TIME_EVERY) {
return false;
}
this.checked = 0;
return this.endTime <= Date.now();
},
reset: function TimeSlotManager_reset() {
this.endTime = Date.now() + TIME_SLOT_DURATION_MS;
this.checked = 0;
}
};
var deferred = Promise.resolve();
var TILING_PATTERN = 1, SHADING_PATTERN = 2;
PartialEvaluator.prototype = {
hasBlendModes: function PartialEvaluator_hasBlendModes(resources) {
if (!isDict(resources)) {
return false;
}
var processed = Object.create(null);
if (resources.objId) {
processed[resources.objId] = true;
}
var nodes = [resources];
while (nodes.length) {
var key;
var node = nodes.shift();
// First check the current resources for blend modes.
var graphicStates = node.get('ExtGState');
if (isDict(graphicStates)) {
graphicStates = graphicStates.getAll();
for (key in graphicStates) {
var graphicState = graphicStates[key];
var bm = graphicState['BM'];
if (isName(bm) && bm.name !== 'Normal') {
return true;
}
}
}
// Descend into the XObjects to look for more resources and blend modes.
var xObjects = node.get('XObject');
if (!isDict(xObjects)) {
continue;
}
xObjects = xObjects.getAll();
for (key in xObjects) {
var xObject = xObjects[key];
if (!isStream(xObject)) {
continue;
}
if (xObject.dict.objId) {
if (processed[xObject.dict.objId]) {
// stream has objId and is processed already
continue;
}
processed[xObject.dict.objId] = true;
}
var xResources = xObject.dict.get('Resources');
// Checking objId to detect an infinite loop.
if (isDict(xResources) &&
(!xResources.objId || !processed[xResources.objId])) {
nodes.push(xResources);
if (xResources.objId) {
processed[xResources.objId] = true;
}
}
}
}
return false;
},
buildFormXObject: function PartialEvaluator_buildFormXObject(resources,
xobj, smask,
operatorList,
initialState) {
var matrix = xobj.dict.get('Matrix');
var bbox = xobj.dict.get('BBox');
var group = xobj.dict.get('Group');
if (group) {
var groupOptions = {
matrix: matrix,
bbox: bbox,
smask: smask,
isolated: false,
knockout: false
};
var groupSubtype = group.get('S');
var colorSpace;
if (isName(groupSubtype) && groupSubtype.name === 'Transparency') {
groupOptions.isolated = (group.get('I') || false);
groupOptions.knockout = (group.get('K') || false);
colorSpace = (group.has('CS') ?
ColorSpace.parse(group.get('CS'), this.xref, resources) : null);
}
if (smask && smask.backdrop) {
colorSpace = colorSpace || ColorSpace.singletons.rgb;
smask.backdrop = colorSpace.getRgb(smask.backdrop, 0);
}
operatorList.addOp(OPS.beginGroup, [groupOptions]);
}
operatorList.addOp(OPS.paintFormXObjectBegin, [matrix, bbox]);
return this.getOperatorList(xobj,
(xobj.dict.get('Resources') || resources), operatorList, initialState).
then(function () {
operatorList.addOp(OPS.paintFormXObjectEnd, []);
if (group) {
operatorList.addOp(OPS.endGroup, [groupOptions]);
}
});
},
buildPaintImageXObject:
function PartialEvaluator_buildPaintImageXObject(resources, image,
inline, operatorList,
cacheKey, cache) {
var self = this;
var dict = image.dict;
var w = dict.get('Width', 'W');
var h = dict.get('Height', 'H');
if (!(w && isNum(w)) || !(h && isNum(h))) {
warn('Image dimensions are missing, or not numbers.');
return;
}
if (PDFJS.maxImageSize !== -1 && w * h > PDFJS.maxImageSize) {
warn('Image exceeded maximum allowed size and was removed.');
return;
}
var imageMask = (dict.get('ImageMask', 'IM') || false);
var imgData, args;
if (imageMask) {
// This depends on a tmpCanvas being filled with the
// current fillStyle, such that processing the pixel
// data can't be done here. Instead of creating a
// complete PDFImage, only read the information needed
// for later.
var width = dict.get('Width', 'W');
var height = dict.get('Height', 'H');
var bitStrideLength = (width + 7) >> 3;
var imgArray = image.getBytes(bitStrideLength * height);
var decode = dict.get('Decode', 'D');
var canTransfer = image instanceof DecodeStream;
var inverseDecode = (!!decode && decode[0] > 0);
imgData = PDFImage.createMask(imgArray, width, height,
canTransfer, inverseDecode);
imgData.cached = true;
args = [imgData];
operatorList.addOp(OPS.paintImageMaskXObject, args);
if (cacheKey) {
cache.key = cacheKey;
cache.fn = OPS.paintImageMaskXObject;
cache.args = args;
}
return;
}
var softMask = (dict.get('SMask', 'SM') || false);
var mask = (dict.get('Mask') || false);
var SMALL_IMAGE_DIMENSIONS = 200;
// Inlining small images into the queue as RGB data
if (inline && !softMask && !mask && !(image instanceof JpegStream) &&
(w + h) < SMALL_IMAGE_DIMENSIONS) {
var imageObj = new PDFImage(this.xref, resources, image,
inline, null, null);
// We force the use of RGBA_32BPP images here, because we can't handle
// any other kind.
imgData = imageObj.createImageData(/* forceRGBA = */ true);
operatorList.addOp(OPS.paintInlineImageXObject, [imgData]);
return;
}
// If there is no imageMask, create the PDFImage and a lot
// of image processing can be done here.
var uniquePrefix = (this.uniquePrefix || '');
var objId = 'img_' + uniquePrefix + (++this.idCounters.obj);
operatorList.addDependency(objId);
args = [objId, w, h];
if (!softMask && !mask && image instanceof JpegStream &&
image.isNativelySupported(this.xref, resources)) {
// These JPEGs don't need any more processing so we can just send it.
operatorList.addOp(OPS.paintJpegXObject, args);
this.handler.send('obj',
[objId, this.pageIndex, 'JpegStream', image.getIR()]);
return;
}
PDFImage.buildImage(self.handler, self.xref, resources, image, inline).
then(function(imageObj) {
var imgData = imageObj.createImageData(/* forceRGBA = */ false);
self.handler.send('obj', [objId, self.pageIndex, 'Image', imgData],
[imgData.data.buffer]);
}).then(null, function (reason) {
warn('Unable to decode image: ' + reason);
self.handler.send('obj', [objId, self.pageIndex, 'Image', null]);
});
operatorList.addOp(OPS.paintImageXObject, args);
if (cacheKey) {
cache.key = cacheKey;
cache.fn = OPS.paintImageXObject;
cache.args = args;
}
},
handleSMask: function PartialEvaluator_handleSmask(smask, resources,
operatorList,
stateManager) {
var smaskContent = smask.get('G');
var smaskOptions = {
subtype: smask.get('S').name,
backdrop: smask.get('BC')
};
return this.buildFormXObject(resources, smaskContent, smaskOptions,
operatorList, stateManager.state.clone());
},
handleTilingType:
function PartialEvaluator_handleTilingType(fn, args, resources,
pattern, patternDict,
operatorList) {
// Create an IR of the pattern code.
var tilingOpList = new OperatorList();
return this.getOperatorList(pattern,
(patternDict.get('Resources') || resources), tilingOpList).
then(function () {
// Add the dependencies to the parent operator list so they are
// resolved before sub operator list is executed synchronously.
operatorList.addDependencies(tilingOpList.dependencies);
operatorList.addOp(fn, getTilingPatternIR({
fnArray: tilingOpList.fnArray,
argsArray: tilingOpList.argsArray
}, patternDict, args));
});
},
handleSetFont:
function PartialEvaluator_handleSetFont(resources, fontArgs, fontRef,
operatorList, state) {
// TODO(mack): Not needed?
var fontName;
if (fontArgs) {
fontArgs = fontArgs.slice();
fontName = fontArgs[0].name;
}
var self = this;
return this.loadFont(fontName, fontRef, this.xref, resources).then(
function (translated) {
if (!translated.font.isType3Font) {
return translated;
}
return translated.loadType3Data(self, resources, operatorList).then(
function () {
return translated;
});
}).then(function (translated) {
state.font = translated.font;
translated.send(self.handler);
return translated.loadedName;
});
},
handleText: function PartialEvaluator_handleText(chars, state) {
var font = state.font;
var glyphs = font.charsToGlyphs(chars);
var isAddToPathSet = !!(state.textRenderingMode &
TextRenderingMode.ADD_TO_PATH_FLAG);
if (font.data && (isAddToPathSet || PDFJS.disableFontFace)) {
var buildPath = function (fontChar) {
if (!font.renderer.hasBuiltPath(fontChar)) {
var path = font.renderer.getPathJs(fontChar);
this.handler.send('commonobj', [
font.loadedName + '_path_' + fontChar,
'FontPath',
path
]);
}
}.bind(this);
for (var i = 0, ii = glyphs.length; i < ii; i++) {
var glyph = glyphs[i];
if (glyph === null) {
continue;
}
buildPath(glyph.fontChar);
// If the glyph has an accent we need to build a path for its
// fontChar too, otherwise CanvasGraphics_paintChar will fail.
var accent = glyph.accent;
if (accent && accent.fontChar) {
buildPath(accent.fontChar);
}
}
}
return glyphs;
},
setGState: function PartialEvaluator_setGState(resources, gState,
operatorList, xref,
stateManager) {
// TODO(mack): This should be rewritten so that this function returns
// what should be added to the queue during each iteration
function setGStateForKey(gStateObj, key, value) {
switch (key) {
case 'Type':
break;
case 'LW':
case 'LC':
case 'LJ':
case 'ML':
case 'D':
case 'RI':
case 'FL':
case 'CA':
case 'ca':
gStateObj.push([key, value]);
break;
case 'Font':
promise = promise.then(function () {
return self.handleSetFont(resources, null, value[0],
operatorList, stateManager.state).
then(function (loadedName) {
operatorList.addDependency(loadedName);
gStateObj.push([key, [loadedName, value[1]]]);
});
});
break;
case 'BM':
gStateObj.push([key, value]);
break;
case 'SMask':
if (isName(value) && value.name === 'None') {
gStateObj.push([key, false]);
break;
}
var dict = xref.fetchIfRef(value);
if (isDict(dict)) {
promise = promise.then(function () {
return self.handleSMask(dict, resources, operatorList,
stateManager);
});
gStateObj.push([key, true]);
} else {
warn('Unsupported SMask type');
}
break;
// Only generate info log messages for the following since
// they are unlikey to have a big impact on the rendering.
case 'OP':
case 'op':
case 'OPM':
case 'BG':
case 'BG2':
case 'UCR':
case 'UCR2':
case 'TR':
case 'TR2':
case 'HT':
case 'SM':
case 'SA':
case 'AIS':
case 'TK':
// TODO implement these operators.
info('graphic state operator ' + key);
break;
default:
info('Unknown graphic state operator ' + key);
break;
}
}
// This array holds the converted/processed state data.
var gStateObj = [];
var gStateMap = gState.map;
var self = this;
var promise = Promise.resolve();
for (var key in gStateMap) {
var value = gStateMap[key];
setGStateForKey(gStateObj, key, value);
}
return promise.then(function () {
operatorList.addOp(OPS.setGState, [gStateObj]);
});
},
loadFont: function PartialEvaluator_loadFont(fontName, font, xref,
resources) {
function errorFont() {
return Promise.resolve(new TranslatedFont('g_font_error',
new ErrorFont('Font ' + fontName + ' is not available'), font));
}
var fontRef;
if (font) { // Loading by ref.
assert(isRef(font));
fontRef = font;
} else { // Loading by name.
var fontRes = resources.get('Font');
if (fontRes) {
fontRef = fontRes.getRaw(fontName);
} else {
warn('fontRes not available');
return errorFont();
}
}
if (this.fontCache.has(fontRef)) {
return this.fontCache.get(fontRef);
}
font = xref.fetchIfRef(fontRef);
if (!isDict(font)) {
return errorFont();
}
// We are holding font.translated references just for fontRef that are not
// dictionaries (Dict). See explanation below.
if (font.translated) {
return font.translated;
}
var fontCapability = createPromiseCapability();
var preEvaluatedFont = this.preEvaluateFont(font, xref);
var descriptor = preEvaluatedFont.descriptor;
var fontID = fontRef.num + '_' + fontRef.gen;
if (isDict(descriptor)) {
if (!descriptor.fontAliases) {
descriptor.fontAliases = Object.create(null);
}
var fontAliases = descriptor.fontAliases;
var hash = preEvaluatedFont.hash;
if (fontAliases[hash]) {
var aliasFontRef = fontAliases[hash].aliasRef;
if (aliasFontRef && this.fontCache.has(aliasFontRef)) {
this.fontCache.putAlias(fontRef, aliasFontRef);
return this.fontCache.get(fontRef);
}
}
if (!fontAliases[hash]) {
fontAliases[hash] = {
fontID: Font.getFontID()
};
}
fontAliases[hash].aliasRef = fontRef;
fontID = fontAliases[hash].fontID;
}
// Workaround for bad PDF generators that don't reference fonts
// properly, i.e. by not using an object identifier.
// Check if the fontRef is a Dict (as opposed to a standard object),
// in which case we don't cache the font and instead reference it by
// fontName in font.loadedName below.
var fontRefIsDict = isDict(fontRef);
if (!fontRefIsDict) {
this.fontCache.put(fontRef, fontCapability.promise);
}
// Keep track of each font we translated so the caller can
// load them asynchronously before calling display on a page.
font.loadedName = 'g_font_' + (fontRefIsDict ?
fontName.replace(/\W/g, '') : fontID);
font.translated = fontCapability.promise;
// TODO move promises into translate font
var translatedPromise;
try {
translatedPromise = Promise.resolve(
this.translateFont(preEvaluatedFont, xref));
} catch (e) {
translatedPromise = Promise.reject(e);
}
translatedPromise.then(function (translatedFont) {
fontCapability.resolve(new TranslatedFont(font.loadedName,
translatedFont, font));
}, function (reason) {
// TODO fontCapability.reject?
UnsupportedManager.notify(UNSUPPORTED_FEATURES.font);
fontCapability.resolve(new TranslatedFont(font.loadedName,
new ErrorFont(reason instanceof Error ? reason.message : reason),
font));
});
return fontCapability.promise;
},
buildPath: function PartialEvaluator_buildPath(operatorList, fn, args) {
var lastIndex = operatorList.length - 1;
if (lastIndex < 0 ||
operatorList.fnArray[lastIndex] !== OPS.constructPath) {
operatorList.addOp(OPS.constructPath, [[fn], args]);
} else {
var opArgs = operatorList.argsArray[lastIndex];
opArgs[0].push(fn);
Array.prototype.push.apply(opArgs[1], args);
}
},
handleColorN: function PartialEvaluator_handleColorN(operatorList, fn, args,
cs, patterns, resources, xref) {
// compile tiling patterns
var patternName = args[args.length - 1];
// SCN/scn applies patterns along with normal colors
var pattern;
if (isName(patternName) &&
(pattern = patterns.get(patternName.name))) {
var dict = (isStream(pattern) ? pattern.dict : pattern);
var typeNum = dict.get('PatternType');
if (typeNum === TILING_PATTERN) {
var color = cs.base ? cs.base.getRgb(args, 0) : null;
return this.handleTilingType(fn, color, resources, pattern,
dict, operatorList);
} else if (typeNum === SHADING_PATTERN) {
var shading = dict.get('Shading');
var matrix = dict.get('Matrix');
pattern = Pattern.parseShading(shading, matrix, xref, resources);
operatorList.addOp(fn, pattern.getIR());
return Promise.resolve();
} else {
return Promise.reject('Unknown PatternType: ' + typeNum);
}
}
// TODO shall we fail here?
operatorList.addOp(fn, args);
return Promise.resolve();
},
getOperatorList: function PartialEvaluator_getOperatorList(stream,
resources,
operatorList,
initialState) {
var self = this;
var xref = this.xref;
var imageCache = {};
assert(operatorList);
resources = (resources || Dict.empty);
var xobjs = (resources.get('XObject') || Dict.empty);
var patterns = (resources.get('Pattern') || Dict.empty);
var stateManager = new StateManager(initialState || new EvalState());
var preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
var timeSlotManager = new TimeSlotManager();
return new Promise(function next(resolve, reject) {
timeSlotManager.reset();
var stop, operation, i, ii, cs;
while (!(stop = timeSlotManager.check()) &&
(operation = preprocessor.read())) {
var args = operation.args;
var fn = operation.fn;
switch (fn | 0) {
case OPS.paintXObject:
if (args[0].code) {
break;
}
// eagerly compile XForm objects
var name = args[0].name;
if (imageCache.key === name) {
operatorList.addOp(imageCache.fn, imageCache.args);
args = [];
continue;
}
var xobj = xobjs.get(name);
if (xobj) {
assert(isStream(xobj), 'XObject should be a stream');
var type = xobj.dict.get('Subtype');
assert(isName(type),
'XObject should have a Name subtype');
if (type.name === 'Form') {
stateManager.save();
return self.buildFormXObject(resources, xobj, null,
operatorList,
stateManager.state.clone()).
then(function () {
stateManager.restore();
next(resolve, reject);
}, reject);
} else if (type.name === 'Image') {
self.buildPaintImageXObject(resources, xobj, false,
operatorList, name, imageCache);
args = [];
continue;
} else if (type.name === 'PS') {
// PostScript XObjects are unused when viewing documents.
// See section 4.7.1 of Adobe's PDF reference.
info('Ignored XObject subtype PS');
continue;
} else {
error('Unhandled XObject subtype ' + type.name);
}
}
break;
case OPS.setFont:
var fontSize = args[1];
// eagerly collect all fonts
return self.handleSetFont(resources, args, null,
operatorList, stateManager.state).
then(function (loadedName) {
operatorList.addDependency(loadedName);
operatorList.addOp(OPS.setFont, [loadedName, fontSize]);
next(resolve, reject);
}, reject);
case OPS.endInlineImage:
var cacheKey = args[0].cacheKey;
if (cacheKey && imageCache.key === cacheKey) {
operatorList.addOp(imageCache.fn, imageCache.args);
args = [];
continue;
}
self.buildPaintImageXObject(resources, args[0], true,
operatorList, cacheKey, imageCache);
args = [];
continue;
case OPS.showText:
args[0] = self.handleText(args[0], stateManager.state);
break;
case OPS.showSpacedText:
var arr = args[0];
var combinedGlyphs = [];
var arrLength = arr.length;
for (i = 0; i < arrLength; ++i) {
var arrItem = arr[i];
if (isString(arrItem)) {
Array.prototype.push.apply(combinedGlyphs,
self.handleText(arrItem, stateManager.state));
} else if (isNum(arrItem)) {
combinedGlyphs.push(arrItem);
}
}
args[0] = combinedGlyphs;
fn = OPS.showText;
break;
case OPS.nextLineShowText:
operatorList.addOp(OPS.nextLine);
args[0] = self.handleText(args[0], stateManager.state);
fn = OPS.showText;
break;
case OPS.nextLineSetSpacingShowText:
operatorList.addOp(OPS.nextLine);
operatorList.addOp(OPS.setWordSpacing, [args.shift()]);
operatorList.addOp(OPS.setCharSpacing, [args.shift()]);
args[0] = self.handleText(args[0], stateManager.state);
fn = OPS.showText;
break;
case OPS.setTextRenderingMode:
stateManager.state.textRenderingMode = args[0];
break;
case OPS.setFillColorSpace:
stateManager.state.fillColorSpace =
ColorSpace.parse(args[0], xref, resources);
continue;
case OPS.setStrokeColorSpace:
stateManager.state.strokeColorSpace =
ColorSpace.parse(args[0], xref, resources);
continue;
case OPS.setFillColor:
cs = stateManager.state.fillColorSpace;
args = cs.getRgb(args, 0);
fn = OPS.setFillRGBColor;
break;
case OPS.setStrokeColor:
cs = stateManager.state.strokeColorSpace;
args = cs.getRgb(args, 0);
fn = OPS.setStrokeRGBColor;
break;
case OPS.setFillGray:
stateManager.state.fillColorSpace = ColorSpace.singletons.gray;
args = ColorSpace.singletons.gray.getRgb(args, 0);
fn = OPS.setFillRGBColor;
break;
case OPS.setStrokeGray:
stateManager.state.strokeColorSpace = ColorSpace.singletons.gray;
args = ColorSpace.singletons.gray.getRgb(args, 0);
fn = OPS.setStrokeRGBColor;
break;
case OPS.setFillCMYKColor:
stateManager.state.fillColorSpace = ColorSpace.singletons.cmyk;
args = ColorSpace.singletons.cmyk.getRgb(args, 0);
fn = OPS.setFillRGBColor;
break;
case OPS.setStrokeCMYKColor:
stateManager.state.strokeColorSpace = ColorSpace.singletons.cmyk;
args = ColorSpace.singletons.cmyk.getRgb(args, 0);
fn = OPS.setStrokeRGBColor;
break;
case OPS.setFillRGBColor:
stateManager.state.fillColorSpace = ColorSpace.singletons.rgb;
args = ColorSpace.singletons.rgb.getRgb(args, 0);
break;
case OPS.setStrokeRGBColor:
stateManager.state.strokeColorSpace = ColorSpace.singletons.rgb;
args = ColorSpace.singletons.rgb.getRgb(args, 0);
break;
case OPS.setFillColorN:
cs = stateManager.state.fillColorSpace;
if (cs.name === 'Pattern') {
return self.handleColorN(operatorList, OPS.setFillColorN,
args, cs, patterns, resources, xref).then(function() {
next(resolve, reject);
}, reject);
}
args = cs.getRgb(args, 0);
fn = OPS.setFillRGBColor;
break;
case OPS.setStrokeColorN:
cs = stateManager.state.strokeColorSpace;
if (cs.name === 'Pattern') {
return self.handleColorN(operatorList, OPS.setStrokeColorN,
args, cs, patterns, resources, xref).then(function() {
next(resolve, reject);
}, reject);
}
args = cs.getRgb(args, 0);
fn = OPS.setStrokeRGBColor;
break;
case OPS.shadingFill:
var shadingRes = resources.get('Shading');
if (!shadingRes) {
error('No shading resource found');
}
var shading = shadingRes.get(args[0].name);
if (!shading) {
error('No shading object found');
}
var shadingFill = Pattern.parseShading(shading, null, xref,
resources);
var patternIR = shadingFill.getIR();
args = [patternIR];
fn = OPS.shadingFill;
break;
case OPS.setGState:
var dictName = args[0];
var extGState = resources.get('ExtGState');
if (!isDict(extGState) || !extGState.has(dictName.name)) {
break;
}
var gState = extGState.get(dictName.name);
return self.setGState(resources, gState, operatorList, xref,
stateManager).then(function() {
next(resolve, reject);
}, reject);
case OPS.moveTo:
case OPS.lineTo:
case OPS.curveTo:
case OPS.curveTo2:
case OPS.curveTo3:
case OPS.closePath:
self.buildPath(operatorList, fn, args);
continue;
}
operatorList.addOp(fn, args);
}
if (stop) {
deferred.then(function () {
next(resolve, reject);
});
return;
}
// Some PDFs don't close all restores inside object/form.
// Closing those for them.
for (i = 0, ii = preprocessor.savedStatesDepth; i < ii; i++) {
operatorList.addOp(OPS.restore, []);
}
resolve();
});
},
getTextContent: function PartialEvaluator_getTextContent(stream, resources,
stateManager) {
stateManager = (stateManager || new StateManager(new TextState()));
var textContent = {
items: [],
styles: Object.create(null)
};
var bidiTexts = textContent.items;
var SPACE_FACTOR = 0.35;
var MULTI_SPACE_FACTOR = 1.5;
var self = this;
var xref = this.xref;
resources = (xref.fetchIfRef(resources) || Dict.empty);
// The xobj is parsed iff it's needed, e.g. if there is a `DO` cmd.
var xobjs = null;
var xobjsCache = {};
var preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
var operation;
var textState;
function newTextChunk() {
var font = textState.font;
if (!(font.loadedName in textContent.styles)) {
textContent.styles[font.loadedName] = {
fontFamily: font.fallbackName,
ascent: font.ascent,
descent: font.descent,
vertical: font.vertical
};
}
return {
str: '',
dir: null,
width: 0,
height: 0,
transform: null,
fontName: font.loadedName
};
}
function runBidi(textChunk) {
var bidiResult = PDFJS.bidi(textChunk.str, -1, textState.font.vertical);
textChunk.str = bidiResult.str;
textChunk.dir = bidiResult.dir;
return textChunk;
}
function handleSetFont(fontName, fontRef) {
return self.loadFont(fontName, fontRef, xref, resources).
then(function (translated) {
textState.font = translated.font;
textState.fontMatrix = translated.font.fontMatrix ||
FONT_IDENTITY_MATRIX;
});
}
function buildTextGeometry(chars, textChunk) {
var font = textState.font;
textChunk = textChunk || newTextChunk();
if (!textChunk.transform) {
// 9.4.4 Text Space Details
var tsm = [textState.fontSize * textState.textHScale, 0,
0, textState.fontSize,
0, textState.textRise];
var trm = textChunk.transform = Util.transform(textState.ctm,
Util.transform(textState.textMatrix, tsm));
if (!font.vertical) {
textChunk.height = Math.sqrt(trm[2] * trm[2] + trm[3] * trm[3]);
} else {
textChunk.width = Math.sqrt(trm[0] * trm[0] + trm[1] * trm[1]);
}
}
var width = 0;
var height = 0;
var glyphs = font.charsToGlyphs(chars);
var defaultVMetrics = font.defaultVMetrics;
for (var i = 0; i < glyphs.length; i++) {
var glyph = glyphs[i];
if (!glyph) { // Previous glyph was a space.
width += textState.wordSpacing * textState.textHScale;
continue;
}
var vMetricX = null;
var vMetricY = null;
var glyphWidth = null;
if (font.vertical) {
if (glyph.vmetric) {
glyphWidth = glyph.vmetric[0];
vMetricX = glyph.vmetric[1];
vMetricY = glyph.vmetric[2];
} else {
glyphWidth = glyph.width;
vMetricX = glyph.width * 0.5;
vMetricY = defaultVMetrics[2];
}
} else {
glyphWidth = glyph.width;
}
var glyphUnicode = glyph.unicode;
if (NormalizedUnicodes[glyphUnicode] !== undefined) {
glyphUnicode = NormalizedUnicodes[glyphUnicode];
}
glyphUnicode = reverseIfRtl(glyphUnicode);
// The following will calculate the x and y of the individual glyphs.
// if (font.vertical) {
// tsm[4] -= vMetricX * Math.abs(textState.fontSize) *
// textState.fontMatrix[0];
// tsm[5] -= vMetricY * textState.fontSize *
// textState.fontMatrix[0];
// }
// var trm = Util.transform(textState.textMatrix, tsm);
// var pt = Util.applyTransform([trm[4], trm[5]], textState.ctm);
// var x = pt[0];
// var y = pt[1];
var tx = 0;
var ty = 0;
if (!font.vertical) {
var w0 = glyphWidth * textState.fontMatrix[0];
tx = (w0 * textState.fontSize + textState.charSpacing) *
textState.textHScale;
width += tx;
} else {
var w1 = glyphWidth * textState.fontMatrix[0];
ty = w1 * textState.fontSize + textState.charSpacing;
height += ty;
}
textState.translateTextMatrix(tx, ty);
textChunk.str += glyphUnicode;
}
var a = textState.textLineMatrix[0];
var b = textState.textLineMatrix[1];
var scaleLineX = Math.sqrt(a * a + b * b);
a = textState.ctm[0];
b = textState.ctm[1];
var scaleCtmX = Math.sqrt(a * a + b * b);
if (!font.vertical) {
textChunk.width += width * scaleCtmX * scaleLineX;
} else {
textChunk.height += Math.abs(height * scaleCtmX * scaleLineX);
}
return textChunk;
}
var timeSlotManager = new TimeSlotManager();
return new Promise(function next(resolve, reject) {
timeSlotManager.reset();
var stop;
while (!(stop = timeSlotManager.check()) &&
(operation = preprocessor.read())) {
textState = stateManager.state;
var fn = operation.fn;
var args = operation.args;
switch (fn | 0) {
case OPS.setFont:
textState.fontSize = args[1];
return handleSetFont(args[0].name).then(function() {
next(resolve, reject);
}, reject);
case OPS.setTextRise:
textState.textRise = args[0];
break;
case OPS.setHScale:
textState.textHScale = args[0] / 100;
break;
case OPS.setLeading:
textState.leading = args[0];
break;
case OPS.moveText:
textState.translateTextLineMatrix(args[0], args[1]);
textState.textMatrix = textState.textLineMatrix.slice();
break;
case OPS.setLeadingMoveText:
textState.leading = -args[1];
textState.translateTextLineMatrix(args[0], args[1]);
textState.textMatrix = textState.textLineMatrix.slice();
break;
case OPS.nextLine:
textState.carriageReturn();
break;
case OPS.setTextMatrix:
textState.setTextMatrix(args[0], args[1], args[2], args[3],
args[4], args[5]);
textState.setTextLineMatrix(args[0], args[1], args[2], args[3],
args[4], args[5]);
break;
case OPS.setCharSpacing:
textState.charSpacing = args[0];
break;
case OPS.setWordSpacing:
textState.wordSpacing = args[0];
break;
case OPS.beginText:
textState.textMatrix = IDENTITY_MATRIX.slice();
textState.textLineMatrix = IDENTITY_MATRIX.slice();
break;
case OPS.showSpacedText:
var items = args[0];
var textChunk = newTextChunk();
var offset;
for (var j = 0, jj = items.length; j < jj; j++) {
if (typeof items[j] === 'string') {
buildTextGeometry(items[j], textChunk);
} else {
var val = items[j] / 1000;
if (!textState.font.vertical) {
offset = -val * textState.fontSize * textState.textHScale *
textState.textMatrix[0];
textState.translateTextMatrix(offset, 0);
textChunk.width += offset;
} else {
offset = -val * textState.fontSize *
textState.textMatrix[3];
textState.translateTextMatrix(0, offset);
textChunk.height += offset;
}
if (items[j] < 0 && textState.font.spaceWidth > 0) {
var fakeSpaces = -items[j] / textState.font.spaceWidth;
if (fakeSpaces > MULTI_SPACE_FACTOR) {
fakeSpaces = Math.round(fakeSpaces);
while (fakeSpaces--) {
textChunk.str += ' ';
}
} else if (fakeSpaces > SPACE_FACTOR) {
textChunk.str += ' ';
}
}
}
}
bidiTexts.push(runBidi(textChunk));
break;
case OPS.showText:
bidiTexts.push(runBidi(buildTextGeometry(args[0])));
break;
case OPS.nextLineShowText:
textState.carriageReturn();
bidiTexts.push(runBidi(buildTextGeometry(args[0])));
break;
case OPS.nextLineSetSpacingShowText:
textState.wordSpacing = args[0];
textState.charSpacing = args[1];
textState.carriageReturn();
bidiTexts.push(runBidi(buildTextGeometry(args[2])));
break;
case OPS.paintXObject:
if (args[0].code) {
break;
}
if (!xobjs) {
xobjs = (resources.get('XObject') || Dict.empty);
}
var name = args[0].name;
if (xobjsCache.key === name) {
if (xobjsCache.texts) {
Util.concatenateToArray(bidiTexts, xobjsCache.texts.items);
Util.extendObj(textContent.styles, xobjsCache.texts.styles);
}
break;
}
var xobj = xobjs.get(name);
if (!xobj) {
break;
}
assert(isStream(xobj), 'XObject should be a stream');
var type = xobj.dict.get('Subtype');
assert(isName(type),
'XObject should have a Name subtype');
if ('Form' !== type.name) {
xobjsCache.key = name;
xobjsCache.texts = null;
break;
}
stateManager.save();
var matrix = xobj.dict.get('Matrix');
if (isArray(matrix) && matrix.length === 6) {
stateManager.transform(matrix);
}
return self.getTextContent(xobj,
xobj.dict.get('Resources') || resources, stateManager).
then(function (formTextContent) {
Util.concatenateToArray(bidiTexts, formTextContent.items);
Util.extendObj(textContent.styles, formTextContent.styles);
stateManager.restore();
xobjsCache.key = name;
xobjsCache.texts = formTextContent;
next(resolve, reject);
}, reject);
case OPS.setGState:
var dictName = args[0];
var extGState = resources.get('ExtGState');
if (!isDict(extGState) || !extGState.has(dictName.name)) {
break;
}
var gsStateMap = extGState.get(dictName.name);
var gsStateFont = null;
for (var key in gsStateMap) {
if (key === 'Font') {
assert(!gsStateFont);
gsStateFont = gsStateMap[key];
}
}
if (gsStateFont) {
textState.fontSize = gsStateFont[1];
return handleSetFont(gsStateFont[0]).then(function() {
next(resolve, reject);
}, reject);
}
break;
} // switch
} // while
if (stop) {
deferred.then(function () {
next(resolve, reject);
});
return;
}
resolve(textContent);
});
},
extractDataStructures: function
partialEvaluatorExtractDataStructures(dict, baseDict,
xref, properties) {
// 9.10.2
var toUnicode = (dict.get('ToUnicode') || baseDict.get('ToUnicode'));
if (toUnicode) {
properties.toUnicode = this.readToUnicode(toUnicode, xref, properties);
}
if (properties.composite) {
// CIDSystemInfo helps to match CID to glyphs
var cidSystemInfo = dict.get('CIDSystemInfo');
if (isDict(cidSystemInfo)) {
properties.cidSystemInfo = {
registry: cidSystemInfo.get('Registry'),
ordering: cidSystemInfo.get('Ordering'),
supplement: cidSystemInfo.get('Supplement')
};
}
var cidToGidMap = dict.get('CIDToGIDMap');
if (isStream(cidToGidMap)) {
properties.cidToGidMap = this.readCidToGidMap(cidToGidMap);
}
}
// Based on 9.6.6 of the spec the encoding can come from multiple places
// and depends on the font type. The base encoding and differences are
// read here, but the encoding that is actually used is chosen during
// glyph mapping in the font.
// TODO: Loading the built in encoding in the font would allow the
// differences to be merged in here not require us to hold on to it.
var differences = [];
var baseEncodingName = null;
var encoding;
if (dict.has('Encoding')) {
encoding = dict.get('Encoding');
if (isDict(encoding)) {
baseEncodingName = encoding.get('BaseEncoding');
baseEncodingName = (isName(baseEncodingName) ?
baseEncodingName.name : null);
// Load the differences between the base and original
if (encoding.has('Differences')) {
var diffEncoding = encoding.get('Differences');
var index = 0;
for (var j = 0, jj = diffEncoding.length; j < jj; j++) {
var data = diffEncoding[j];
if (isNum(data)) {
index = data;
} else {
differences[index++] = data.name;
}
}
}
} else if (isName(encoding)) {
baseEncodingName = encoding.name;
} else {
error('Encoding is not a Name nor a Dict');
}
// According to table 114 if the encoding is a named encoding it must be
// one of these predefined encodings.
if ((baseEncodingName !== 'MacRomanEncoding' &&
baseEncodingName !== 'MacExpertEncoding' &&
baseEncodingName !== 'WinAnsiEncoding')) {
baseEncodingName = null;
}
}
if (baseEncodingName) {
properties.defaultEncoding = Encodings[baseEncodingName].slice();
} else {
encoding = (properties.type === 'TrueType' ?
Encodings.WinAnsiEncoding : Encodings.StandardEncoding);
// The Symbolic attribute can be misused for regular fonts
// Heuristic: we have to check if the font is a standard one also
if (!!(properties.flags & FontFlags.Symbolic)) {
encoding = (!properties.file && /Symbol/i.test(properties.name) ?
Encodings.SymbolSetEncoding :
Encodings.MacRomanEncoding);
}
properties.defaultEncoding = encoding;
}
properties.differences = differences;
properties.baseEncodingName = baseEncodingName;
properties.dict = dict;
},
readToUnicode: function PartialEvaluator_readToUnicode(toUnicode) {
var cmapObj = toUnicode;
if (isName(cmapObj)) {
return CMapFactory.create(cmapObj).map;
} else if (isStream(cmapObj)) {
var cmap = CMapFactory.create(cmapObj).map;
// Convert UTF-16BE
// NOTE: cmap can be a sparse array, so use forEach instead of for(;;)
// to iterate over all keys.
cmap.forEach(function(token, i) {
var str = [];
for (var k = 0; k < token.length; k += 2) {
var w1 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
if ((w1 & 0xF800) !== 0xD800) { // w1 < 0xD800 || w1 > 0xDFFF
str.push(w1);
continue;
}
k += 2;
var w2 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
str.push(((w1 & 0x3ff) << 10) + (w2 & 0x3ff) + 0x10000);
}
cmap[i] = String.fromCharCode.apply(String, str);
});
return cmap;
}
return null;
},
readCidToGidMap: function PartialEvaluator_readCidToGidMap(cidToGidStream) {
// Extract the encoding from the CIDToGIDMap
var glyphsData = cidToGidStream.getBytes();
// Set encoding 0 to later verify the font has an encoding
var result = [];
for (var j = 0, jj = glyphsData.length; j < jj; j++) {
var glyphID = (glyphsData[j++] << 8) | glyphsData[j];
if (glyphID === 0) {
continue;
}
var code = j >> 1;
result[code] = glyphID;
}
return result;
},
extractWidths: function PartialEvaluator_extractWidths(dict, xref,
descriptor,
properties) {
var glyphsWidths = [];
var defaultWidth = 0;
var glyphsVMetrics = [];
var defaultVMetrics;
var i, ii, j, jj, start, code, widths;
if (properties.composite) {
defaultWidth = dict.get('DW') || 1000;
widths = dict.get('W');
if (widths) {
for (i = 0, ii = widths.length; i < ii; i++) {
start = widths[i++];
code = xref.fetchIfRef(widths[i]);
if (isArray(code)) {
for (j = 0, jj = code.length; j < jj; j++) {
glyphsWidths[start++] = code[j];
}
} else {
var width = widths[++i];
for (j = start; j <= code; j++) {
glyphsWidths[j] = width;
}
}
}
}
if (properties.vertical) {
var vmetrics = (dict.get('DW2') || [880, -1000]);
defaultVMetrics = [vmetrics[1], defaultWidth * 0.5, vmetrics[0]];
vmetrics = dict.get('W2');
if (vmetrics) {
for (i = 0, ii = vmetrics.length; i < ii; i++) {
start = vmetrics[i++];
code = xref.fetchIfRef(vmetrics[i]);
if (isArray(code)) {
for (j = 0, jj = code.length; j < jj; j++) {
glyphsVMetrics[start++] = [code[j++], code[j++], code[j]];
}
} else {
var vmetric = [vmetrics[++i], vmetrics[++i], vmetrics[++i]];
for (j = start; j <= code; j++) {
glyphsVMetrics[j] = vmetric;
}
}
}
}
}
} else {
var firstChar = properties.firstChar;
widths = dict.get('Widths');
if (widths) {
j = firstChar;
for (i = 0, ii = widths.length; i < ii; i++) {
glyphsWidths[j++] = widths[i];
}
defaultWidth = (parseFloat(descriptor.get('MissingWidth')) || 0);
} else {
// Trying get the BaseFont metrics (see comment above).
var baseFontName = dict.get('BaseFont');
if (isName(baseFontName)) {
var metrics = this.getBaseFontMetrics(baseFontName.name);
glyphsWidths = this.buildCharCodeToWidth(metrics.widths,
properties);
defaultWidth = metrics.defaultWidth;
}
}
}
// Heuristic: detection of monospace font by checking all non-zero widths
var isMonospace = true;
var firstWidth = defaultWidth;
for (var glyph in glyphsWidths) {
var glyphWidth = glyphsWidths[glyph];
if (!glyphWidth) {
continue;
}
if (!firstWidth) {
firstWidth = glyphWidth;
continue;
}
if (firstWidth != glyphWidth) {
isMonospace = false;
break;
}
}
if (isMonospace) {
properties.flags |= FontFlags.FixedPitch;
}
properties.defaultWidth = defaultWidth;
properties.widths = glyphsWidths;
properties.defaultVMetrics = defaultVMetrics;
properties.vmetrics = glyphsVMetrics;
},
isSerifFont: function PartialEvaluator_isSerifFont(baseFontName) {
// Simulating descriptor flags attribute
var fontNameWoStyle = baseFontName.split('-')[0];
return (fontNameWoStyle in serifFonts) ||
(fontNameWoStyle.search(/serif/gi) !== -1);
},
getBaseFontMetrics: function PartialEvaluator_getBaseFontMetrics(name) {
var defaultWidth = 0;
var widths = [];
var monospace = false;
var lookupName = (stdFontMap[name] || name);
if (!(lookupName in Metrics)) {
// Use default fonts for looking up font metrics if the passed
// font is not a base font
if (this.isSerifFont(name)) {
lookupName = 'Times-Roman';
} else {
lookupName = 'Helvetica';
}
}
var glyphWidths = Metrics[lookupName];
if (isNum(glyphWidths)) {
defaultWidth = glyphWidths;
monospace = true;
} else {
widths = glyphWidths;
}
return {
defaultWidth: defaultWidth,
monospace: monospace,
widths: widths
};
},
buildCharCodeToWidth:
function PartialEvaluator_bulildCharCodeToWidth(widthsByGlyphName,
properties) {
var widths = Object.create(null);
var differences = properties.differences;
var encoding = properties.defaultEncoding;
for (var charCode = 0; charCode < 256; charCode++) {
if (charCode in differences &&
widthsByGlyphName[differences[charCode]]) {
widths[charCode] = widthsByGlyphName[differences[charCode]];
continue;
}
if (charCode in encoding && widthsByGlyphName[encoding[charCode]]) {
widths[charCode] = widthsByGlyphName[encoding[charCode]];
continue;
}
}
return widths;
},
preEvaluateFont: function PartialEvaluator_preEvaluateFont(dict, xref) {
var baseDict = dict;
var type = dict.get('Subtype');
assert(isName(type), 'invalid font Subtype');
var composite = false;
var uint8array;
if (type.name === 'Type0') {
// If font is a composite
// - get the descendant font
// - set the type according to the descendant font
// - get the FontDescriptor from the descendant font
var df = dict.get('DescendantFonts');
if (!df) {
error('Descendant fonts are not specified');
}
dict = (isArray(df) ? xref.fetchIfRef(df[0]) : df);
type = dict.get('Subtype');
assert(isName(type), 'invalid font Subtype');
composite = true;
}
var descriptor = dict.get('FontDescriptor');
if (descriptor) {
var hash = new MurmurHash3_64();
var encoding = baseDict.getRaw('Encoding');
if (isName(encoding)) {
hash.update(encoding.name);
} else if (isRef(encoding)) {
hash.update(encoding.num + '_' + encoding.gen);
}
var toUnicode = dict.get('ToUnicode') || baseDict.get('ToUnicode');
if (isStream(toUnicode)) {
var stream = toUnicode.str || toUnicode;
uint8array = stream.buffer ?
new Uint8Array(stream.buffer.buffer, 0, stream.bufferLength) :
new Uint8Array(stream.bytes.buffer,
stream.start, stream.end - stream.start);
hash.update(uint8array);
} else if (isName(toUnicode)) {
hash.update(toUnicode.name);
}
var widths = dict.get('Widths') || baseDict.get('Widths');
if (widths) {
uint8array = new Uint8Array(new Uint32Array(widths).buffer);
hash.update(uint8array);
}
}
return {
descriptor: descriptor,
dict: dict,
baseDict: baseDict,
composite: composite,
hash: hash ? hash.hexdigest() : ''
};
},
translateFont: function PartialEvaluator_translateFont(preEvaluatedFont,
xref) {
var baseDict = preEvaluatedFont.baseDict;
var dict = preEvaluatedFont.dict;
var composite = preEvaluatedFont.composite;
var descriptor = preEvaluatedFont.descriptor;
var type = dict.get('Subtype');
var maxCharIndex = (composite ? 0xFFFF : 0xFF);
var properties;
if (!descriptor) {
if (type.name === 'Type3') {
// FontDescriptor is only required for Type3 fonts when the document
// is a tagged pdf. Create a barbebones one to get by.
descriptor = new Dict(null);
descriptor.set('FontName', Name.get(type.name));
} else {
// Before PDF 1.5 if the font was one of the base 14 fonts, having a
// FontDescriptor was not required.
// This case is here for compatibility.
var baseFontName = dict.get('BaseFont');
if (!isName(baseFontName)) {
error('Base font is not specified');
}
// Using base font name as a font name.
baseFontName = baseFontName.name.replace(/[,_]/g, '-');
var metrics = this.getBaseFontMetrics(baseFontName);
// Simulating descriptor flags attribute
var fontNameWoStyle = baseFontName.split('-')[0];
var flags =
(this.isSerifFont(fontNameWoStyle) ? FontFlags.Serif : 0) |
(metrics.monospace ? FontFlags.FixedPitch : 0) |
(symbolsFonts[fontNameWoStyle] ? FontFlags.Symbolic :
FontFlags.Nonsymbolic);
properties = {
type: type.name,
name: baseFontName,
widths: metrics.widths,
defaultWidth: metrics.defaultWidth,
flags: flags,
firstChar: 0,
lastChar: maxCharIndex
};
this.extractDataStructures(dict, dict, xref, properties);
properties.widths = this.buildCharCodeToWidth(metrics.widths,
properties);
return new Font(baseFontName, null, properties);
}
}
// According to the spec if 'FontDescriptor' is declared, 'FirstChar',
// 'LastChar' and 'Widths' should exist too, but some PDF encoders seem
// to ignore this rule when a variant of a standart font is used.
// TODO Fill the width array depending on which of the base font this is
// a variant.
var firstChar = (dict.get('FirstChar') || 0);
var lastChar = (dict.get('LastChar') || maxCharIndex);
var fontName = descriptor.get('FontName');
var baseFont = dict.get('BaseFont');
// Some bad PDFs have a string as the font name.
if (isString(fontName)) {
fontName = Name.get(fontName);
}
if (isString(baseFont)) {
baseFont = Name.get(baseFont);
}
if (type.name !== 'Type3') {
var fontNameStr = fontName && fontName.name;
var baseFontStr = baseFont && baseFont.name;
if (fontNameStr !== baseFontStr) {
info('The FontDescriptor\'s FontName is "' + fontNameStr +
'" but should be the same as the Font\'s BaseFont "' +
baseFontStr + '"');
// Workaround for cases where e.g. fontNameStr = 'Arial' and
// baseFontStr = 'Arial,Bold' (needed when no font file is embedded).
if (fontNameStr && baseFontStr &&
baseFontStr.search(fontNameStr) === 0) {
fontName = baseFont;
}
}
}
fontName = (fontName || baseFont);
assert(isName(fontName), 'invalid font name');
var fontFile = descriptor.get('FontFile', 'FontFile2', 'FontFile3');
if (fontFile) {
if (fontFile.dict) {
var subtype = fontFile.dict.get('Subtype');
if (subtype) {
subtype = subtype.name;
}
var length1 = fontFile.dict.get('Length1');
var length2 = fontFile.dict.get('Length2');
}
}
properties = {
type: type.name,
name: fontName.name,
subtype: subtype,
file: fontFile,
length1: length1,
length2: length2,
loadedName: baseDict.loadedName,
composite: composite,
wideChars: composite,
fixedPitch: false,
fontMatrix: (dict.get('FontMatrix') || FONT_IDENTITY_MATRIX),
firstChar: firstChar || 0,
lastChar: (lastChar || maxCharIndex),
bbox: descriptor.get('FontBBox'),
ascent: descriptor.get('Ascent'),
descent: descriptor.get('Descent'),
xHeight: descriptor.get('XHeight'),
capHeight: descriptor.get('CapHeight'),
flags: descriptor.get('Flags'),
italicAngle: descriptor.get('ItalicAngle'),
coded: false
};
if (composite) {
var cidEncoding = baseDict.get('Encoding');
if (isName(cidEncoding)) {
properties.cidEncoding = cidEncoding.name;
}
properties.cMap = CMapFactory.create(cidEncoding,
{ url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null);
properties.vertical = properties.cMap.vertical;
}
this.extractDataStructures(dict, baseDict, xref, properties);
this.extractWidths(dict, xref, descriptor, properties);
if (type.name === 'Type3') {
properties.isType3Font = true;
}
return new Font(fontName.name, fontFile, properties);
}
};
return PartialEvaluator;
})();
var TranslatedFont = (function TranslatedFontClosure() {
function TranslatedFont(loadedName, font, dict) {
this.loadedName = loadedName;
this.font = font;
this.dict = dict;
this.type3Loaded = null;
this.sent = false;
}
TranslatedFont.prototype = {
send: function (handler) {
if (this.sent) {
return;
}
var fontData = this.font.exportData();
handler.send('commonobj', [
this.loadedName,
'Font',
fontData
]);
this.sent = true;
},
loadType3Data: function (evaluator, resources, parentOperatorList) {
assert(this.font.isType3Font);
if (this.type3Loaded) {
return this.type3Loaded;
}
var translatedFont = this.font;
var loadCharProcsPromise = Promise.resolve();
var charProcs = this.dict.get('CharProcs').getAll();
var fontResources = this.dict.get('Resources') || resources;
var charProcKeys = Object.keys(charProcs);
var charProcOperatorList = {};
for (var i = 0, n = charProcKeys.length; i < n; ++i) {
loadCharProcsPromise = loadCharProcsPromise.then(function (key) {
var glyphStream = charProcs[key];
var operatorList = new OperatorList();
return evaluator.getOperatorList(glyphStream, fontResources,
operatorList).
then(function () {
charProcOperatorList[key] = operatorList.getIR();
// Add the dependencies to the parent operator list so they are
// resolved before sub operator list is executed synchronously.
parentOperatorList.addDependencies(operatorList.dependencies);
});
}.bind(this, charProcKeys[i]));
}
this.type3Loaded = loadCharProcsPromise.then(function () {
translatedFont.charProcOperatorList = charProcOperatorList;
});
return this.type3Loaded;
}
};
return TranslatedFont;
})();
var OperatorList = (function OperatorListClosure() {
var CHUNK_SIZE = 1000;
var CHUNK_SIZE_ABOUT = CHUNK_SIZE - 5; // close to chunk size
function getTransfers(queue) {
var transfers = [];
var fnArray = queue.fnArray, argsArray = queue.argsArray;
for (var i = 0, ii = queue.length; i < ii; i++) {
switch (fnArray[i]) {
case OPS.paintInlineImageXObject:
case OPS.paintInlineImageXObjectGroup:
case OPS.paintImageMaskXObject:
var arg = argsArray[i][0]; // first param in imgData
if (!arg.cached) {
transfers.push(arg.data.buffer);
}
break;
}
}
return transfers;
}
function OperatorList(intent, messageHandler, pageIndex) {
this.messageHandler = messageHandler;
this.fnArray = [];
this.argsArray = [];
this.dependencies = {};
this.pageIndex = pageIndex;
this.intent = intent;
}
OperatorList.prototype = {
get length() {
return this.argsArray.length;
},
addOp: function(fn, args) {
this.fnArray.push(fn);
this.argsArray.push(args);
if (this.messageHandler) {
if (this.fnArray.length >= CHUNK_SIZE) {
this.flush();
} else if (this.fnArray.length >= CHUNK_SIZE_ABOUT &&
(fn === OPS.restore || fn === OPS.endText)) {
// heuristic to flush on boundary of restore or endText
this.flush();
}
}
},
addDependency: function(dependency) {
if (dependency in this.dependencies) {
return;
}
this.dependencies[dependency] = true;
this.addOp(OPS.dependency, [dependency]);
},
addDependencies: function(dependencies) {
for (var key in dependencies) {
this.addDependency(key);
}
},
addOpList: function(opList) {
Util.extendObj(this.dependencies, opList.dependencies);
for (var i = 0, ii = opList.length; i < ii; i++) {
this.addOp(opList.fnArray[i], opList.argsArray[i]);
}
},
getIR: function() {
return {
fnArray: this.fnArray,
argsArray: this.argsArray,
length: this.length
};
},
flush: function(lastChunk) {
new QueueOptimizer().optimize(this);
var transfers = getTransfers(this);
this.messageHandler.send('RenderPageChunk', {
operatorList: {
fnArray: this.fnArray,
argsArray: this.argsArray,
lastChunk: lastChunk,
length: this.length
},
pageIndex: this.pageIndex,
intent: this.intent
}, transfers);
this.dependencies = {};
this.fnArray.length = 0;
this.argsArray.length = 0;
}
};
return OperatorList;
})();
var StateManager = (function StateManagerClosure() {
function StateManager(initialState) {
this.state = initialState;
this.stateStack = [];
}
StateManager.prototype = {
save: function () {
var old = this.state;
this.stateStack.push(this.state);
this.state = old.clone();
},
restore: function () {
var prev = this.stateStack.pop();
if (prev) {
this.state = prev;
}
},
transform: function (args) {
this.state.ctm = Util.transform(this.state.ctm, args);
}
};
return StateManager;
})();
var TextState = (function TextStateClosure() {
function TextState() {
this.ctm = new Float32Array(IDENTITY_MATRIX);
this.fontSize = 0;
this.font = null;
this.fontMatrix = FONT_IDENTITY_MATRIX;
this.textMatrix = IDENTITY_MATRIX.slice();
this.textLineMatrix = IDENTITY_MATRIX.slice();
this.charSpacing = 0;
this.wordSpacing = 0;
this.leading = 0;
this.textHScale = 1;
this.textRise = 0;
}
TextState.prototype = {
setTextMatrix: function TextState_setTextMatrix(a, b, c, d, e, f) {
var m = this.textMatrix;
m[0] = a; m[1] = b; m[2] = c; m[3] = d; m[4] = e; m[5] = f;
},
setTextLineMatrix: function TextState_setTextMatrix(a, b, c, d, e, f) {
var m = this.textLineMatrix;
m[0] = a; m[1] = b; m[2] = c; m[3] = d; m[4] = e; m[5] = f;
},
translateTextMatrix: function TextState_translateTextMatrix(x, y) {
var m = this.textMatrix;
m[4] = m[0] * x + m[2] * y + m[4];
m[5] = m[1] * x + m[3] * y + m[5];
},
translateTextLineMatrix: function TextState_translateTextMatrix(x, y) {
var m = this.textLineMatrix;
m[4] = m[0] * x + m[2] * y + m[4];
m[5] = m[1] * x + m[3] * y + m[5];
},
calcRenderMatrix: function TextState_calcRendeMatrix(ctm) {
// 9.4.4 Text Space Details
var tsm = [this.fontSize * this.textHScale, 0,
0, this.fontSize,
0, this.textRise];
return Util.transform(ctm, Util.transform(this.textMatrix, tsm));
},
carriageReturn: function TextState_carriageReturn() {
this.translateTextLineMatrix(0, -this.leading);
this.textMatrix = this.textLineMatrix.slice();
},
clone: function TextState_clone() {
var clone = Object.create(this);
clone.textMatrix = this.textMatrix.slice();
clone.textLineMatrix = this.textLineMatrix.slice();
clone.fontMatrix = this.fontMatrix.slice();
return clone;
}
};
return TextState;
})();
var EvalState = (function EvalStateClosure() {
function EvalState() {
this.ctm = new Float32Array(IDENTITY_MATRIX);
this.font = null;
this.textRenderingMode = TextRenderingMode.FILL;
this.fillColorSpace = ColorSpace.singletons.gray;
this.strokeColorSpace = ColorSpace.singletons.gray;
}
EvalState.prototype = {
clone: function CanvasExtraState_clone() {
return Object.create(this);
},
};
return EvalState;
})();
var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
// Specifies properties for each command
//
// If variableArgs === true: [0, `numArgs`] expected
// If variableArgs === false: exactly `numArgs` expected
var OP_MAP = {
// Graphic state
w: { id: OPS.setLineWidth, numArgs: 1, variableArgs: false },
J: { id: OPS.setLineCap, numArgs: 1, variableArgs: false },
j: { id: OPS.setLineJoin, numArgs: 1, variableArgs: false },
M: { id: OPS.setMiterLimit, numArgs: 1, variableArgs: false },
d: { id: OPS.setDash, numArgs: 2, variableArgs: false },
ri: { id: OPS.setRenderingIntent, numArgs: 1, variableArgs: false },
i: { id: OPS.setFlatness, numArgs: 1, variableArgs: false },
gs: { id: OPS.setGState, numArgs: 1, variableArgs: false },
q: { id: OPS.save, numArgs: 0, variableArgs: false },
Q: { id: OPS.restore, numArgs: 0, variableArgs: false },
cm: { id: OPS.transform, numArgs: 6, variableArgs: false },
// Path
m: { id: OPS.moveTo, numArgs: 2, variableArgs: false },
l: { id: OPS.lineTo, numArgs: 2, variableArgs: false },
c: { id: OPS.curveTo, numArgs: 6, variableArgs: false },
v: { id: OPS.curveTo2, numArgs: 4, variableArgs: false },
y: { id: OPS.curveTo3, numArgs: 4, variableArgs: false },
h: { id: OPS.closePath, numArgs: 0, variableArgs: false },
re: { id: OPS.rectangle, numArgs: 4, variableArgs: false },
S: { id: OPS.stroke, numArgs: 0, variableArgs: false },
s: { id: OPS.closeStroke, numArgs: 0, variableArgs: false },
f: { id: OPS.fill, numArgs: 0, variableArgs: false },
F: { id: OPS.fill, numArgs: 0, variableArgs: false },
'f*': { id: OPS.eoFill, numArgs: 0, variableArgs: false },
B: { id: OPS.fillStroke, numArgs: 0, variableArgs: false },
'B*': { id: OPS.eoFillStroke, numArgs: 0, variableArgs: false },
b: { id: OPS.closeFillStroke, numArgs: 0, variableArgs: false },
'b*': { id: OPS.closeEOFillStroke, numArgs: 0, variableArgs: false },
n: { id: OPS.endPath, numArgs: 0, variableArgs: false },
// Clipping
W: { id: OPS.clip, numArgs: 0, variableArgs: false },
'W*': { id: OPS.eoClip, numArgs: 0, variableArgs: false },
// Text
BT: { id: OPS.beginText, numArgs: 0, variableArgs: false },
ET: { id: OPS.endText, numArgs: 0, variableArgs: false },
Tc: { id: OPS.setCharSpacing, numArgs: 1, variableArgs: false },
Tw: { id: OPS.setWordSpacing, numArgs: 1, variableArgs: false },
Tz: { id: OPS.setHScale, numArgs: 1, variableArgs: false },
TL: { id: OPS.setLeading, numArgs: 1, variableArgs: false },
Tf: { id: OPS.setFont, numArgs: 2, variableArgs: false },
Tr: { id: OPS.setTextRenderingMode, numArgs: 1, variableArgs: false },
Ts: { id: OPS.setTextRise, numArgs: 1, variableArgs: false },
Td: { id: OPS.moveText, numArgs: 2, variableArgs: false },
TD: { id: OPS.setLeadingMoveText, numArgs: 2, variableArgs: false },
Tm: { id: OPS.setTextMatrix, numArgs: 6, variableArgs: false },
'T*': { id: OPS.nextLine, numArgs: 0, variableArgs: false },
Tj: { id: OPS.showText, numArgs: 1, variableArgs: false },
TJ: { id: OPS.showSpacedText, numArgs: 1, variableArgs: false },
'\'': { id: OPS.nextLineShowText, numArgs: 1, variableArgs: false },
'"': { id: OPS.nextLineSetSpacingShowText, numArgs: 3,
variableArgs: false },
// Type3 fonts
d0: { id: OPS.setCharWidth, numArgs: 2, variableArgs: false },
d1: { id: OPS.setCharWidthAndBounds, numArgs: 6, variableArgs: false },
// Color
CS: { id: OPS.setStrokeColorSpace, numArgs: 1, variableArgs: false },
cs: { id: OPS.setFillColorSpace, numArgs: 1, variableArgs: false },
SC: { id: OPS.setStrokeColor, numArgs: 4, variableArgs: true },
SCN: { id: OPS.setStrokeColorN, numArgs: 33, variableArgs: true },
sc: { id: OPS.setFillColor, numArgs: 4, variableArgs: true },
scn: { id: OPS.setFillColorN, numArgs: 33, variableArgs: true },
G: { id: OPS.setStrokeGray, numArgs: 1, variableArgs: false },
g: { id: OPS.setFillGray, numArgs: 1, variableArgs: false },
RG: { id: OPS.setStrokeRGBColor, numArgs: 3, variableArgs: false },
rg: { id: OPS.setFillRGBColor, numArgs: 3, variableArgs: false },
K: { id: OPS.setStrokeCMYKColor, numArgs: 4, variableArgs: false },
k: { id: OPS.setFillCMYKColor, numArgs: 4, variableArgs: false },
// Shading
sh: { id: OPS.shadingFill, numArgs: 1, variableArgs: false },
// Images
BI: { id: OPS.beginInlineImage, numArgs: 0, variableArgs: false },
ID: { id: OPS.beginImageData, numArgs: 0, variableArgs: false },
EI: { id: OPS.endInlineImage, numArgs: 1, variableArgs: false },
// XObjects
Do: { id: OPS.paintXObject, numArgs: 1, variableArgs: false },
MP: { id: OPS.markPoint, numArgs: 1, variableArgs: false },
DP: { id: OPS.markPointProps, numArgs: 2, variableArgs: false },
BMC: { id: OPS.beginMarkedContent, numArgs: 1, variableArgs: false },
BDC: { id: OPS.beginMarkedContentProps, numArgs: 2,
variableArgs: false },
EMC: { id: OPS.endMarkedContent, numArgs: 0, variableArgs: false },
// Compatibility
BX: { id: OPS.beginCompat, numArgs: 0, variableArgs: false },
EX: { id: OPS.endCompat, numArgs: 0, variableArgs: false },
// (reserved partial commands for the lexer)
BM: null,
BD: null,
'true': null,
fa: null,
fal: null,
fals: null,
'false': null,
nu: null,
nul: null,
'null': null
};
function EvaluatorPreprocessor(stream, xref, stateManager) {
// TODO(mduan): pass array of knownCommands rather than OP_MAP
// dictionary
this.parser = new Parser(new Lexer(stream, OP_MAP), false, xref);
this.stateManager = stateManager;
this.nonProcessedArgs = [];
}
EvaluatorPreprocessor.prototype = {
get savedStatesDepth() {
return this.stateManager.stateStack.length;
},
read: function EvaluatorPreprocessor_read() {
var args = [];
while (true) {
var obj = this.parser.getObj();
if (isEOF(obj)) {
return null; // no more commands
}
if (!isCmd(obj)) {
// argument
if (obj !== null) {
args.push((obj instanceof Dict ? obj.getAll() : obj));
assert(args.length <= 33, 'Too many arguments');
}
continue;
}
var cmd = obj.cmd;
// Check that the command is valid
var opSpec = OP_MAP[cmd];
if (!opSpec) {
warn('Unknown command "' + cmd + '"');
continue;
}
var fn = opSpec.id;
var numArgs = opSpec.numArgs;
if (!opSpec.variableArgs) {
// Some post script commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
if (args.length !== numArgs) {
var nonProcessedArgs = this.nonProcessedArgs;
while (args.length > numArgs) {
nonProcessedArgs.push(args.shift());
}
while (args.length < numArgs && nonProcessedArgs.length !== 0) {
args.unshift(nonProcessedArgs.pop());
}
}
if (args.length < numArgs) {
// If we receive too few args, it's not possible to possible
// to execute the command, so skip the command
info('Command ' + fn + ': because expected ' +
numArgs + ' args, but received ' + args.length +
' args; skipping');
args = [];
continue;
}
} else if (args.length > numArgs) {
info('Command ' + fn + ': expected [0,' + numArgs +
'] args, but received ' + args.length + ' args');
}
// TODO figure out how to type-check vararg functions
this.preprocessCommand(fn, args);
return { fn: fn, args: args };
}
},
preprocessCommand:
function EvaluatorPreprocessor_preprocessCommand(fn, args) {
switch (fn | 0) {
case OPS.save:
this.stateManager.save();
break;
case OPS.restore:
this.stateManager.restore();
break;
case OPS.transform:
this.stateManager.transform(args);
break;
}
}
};
return EvaluatorPreprocessor;
})();
var QueueOptimizer = (function QueueOptimizerClosure() {
function addState(parentState, pattern, fn) {
var state = parentState;
for (var i = 0, ii = pattern.length - 1; i < ii; i++) {
var item = pattern[i];
state = (state[item] || (state[item] = []));
}
state[pattern[pattern.length - 1]] = fn;
}
function handlePaintSolidColorImageMask(index, count, fnArray, argsArray) {
// Handles special case of mainly LaTeX documents which
// use image masks to draw lines with the current fill style.
// 'count' groups of (save, transform, paintImageMaskXObject, restore)+
// have been found at index.
for (var i = 0; i < count; i++) {
var arg = argsArray[index + 4 * i + 2];
var imageMask = arg.length === 1 && arg[0];
if (imageMask && imageMask.width === 1 && imageMask.height === 1 &&
(!imageMask.data.length || (imageMask.data.length === 1 &&
imageMask.data[0] === 0))) {
fnArray[index + 4 * i + 2] = OPS.paintSolidColorImageMask;
continue;
}
break;
}
return count - i;
}
var InitialState = [];
addState(InitialState,
[OPS.save, OPS.transform, OPS.paintInlineImageXObject, OPS.restore],
function foundInlineImageGroup(context) {
// grouping paintInlineImageXObject's into paintInlineImageXObjectGroup
// searching for (save, transform, paintInlineImageXObject, restore)+
var MIN_IMAGES_IN_INLINE_IMAGES_BLOCK = 10;
var MAX_IMAGES_IN_INLINE_IMAGES_BLOCK = 200;
var MAX_WIDTH = 1000;
var IMAGE_PADDING = 1;
var fnArray = context.fnArray, argsArray = context.argsArray;
var j = context.currentOperation - 3, i = j + 4;
var ii = fnArray.length;
for (; i < ii && fnArray[i - 4] === fnArray[i]; i++) {}
var count = Math.min((i - j) >> 2, MAX_IMAGES_IN_INLINE_IMAGES_BLOCK);
if (count < MIN_IMAGES_IN_INLINE_IMAGES_BLOCK) {
context.currentOperation = i - 1;
return;
}
// assuming that heights of those image is too small (~1 pixel)
// packing as much as possible by lines
var maxX = 0;
var map = [], maxLineHeight = 0;
var currentX = IMAGE_PADDING, currentY = IMAGE_PADDING;
var q;
for (q = 0; q < count; q++) {
var transform = argsArray[j + (q << 2) + 1];
var img = argsArray[j + (q << 2) + 2][0];
if (currentX + img.width > MAX_WIDTH) {
// starting new line
maxX = Math.max(maxX, currentX);
currentY += maxLineHeight + 2 * IMAGE_PADDING;
currentX = 0;
maxLineHeight = 0;
}
map.push({
transform: transform,
x: currentX, y: currentY,
w: img.width, h: img.height
});
currentX += img.width + 2 * IMAGE_PADDING;
maxLineHeight = Math.max(maxLineHeight, img.height);
}
var imgWidth = Math.max(maxX, currentX) + IMAGE_PADDING;
var imgHeight = currentY + maxLineHeight + IMAGE_PADDING;
var imgData = new Uint8Array(imgWidth * imgHeight * 4);
var imgRowSize = imgWidth << 2;
for (q = 0; q < count; q++) {
var data = argsArray[j + (q << 2) + 2][0].data;
// copy image by lines and extends pixels into padding
var rowSize = map[q].w << 2;
var dataOffset = 0;
var offset = (map[q].x + map[q].y * imgWidth) << 2;
imgData.set(data.subarray(0, rowSize), offset - imgRowSize);
for (var k = 0, kk = map[q].h; k < kk; k++) {
imgData.set(data.subarray(dataOffset, dataOffset + rowSize), offset);
dataOffset += rowSize;
offset += imgRowSize;
}
imgData.set(data.subarray(dataOffset - rowSize, dataOffset), offset);
while (offset >= 0) {
data[offset - 4] = data[offset];
data[offset - 3] = data[offset + 1];
data[offset - 2] = data[offset + 2];
data[offset - 1] = data[offset + 3];
data[offset + rowSize] = data[offset + rowSize - 4];
data[offset + rowSize + 1] = data[offset + rowSize - 3];
data[offset + rowSize + 2] = data[offset + rowSize - 2];
data[offset + rowSize + 3] = data[offset + rowSize - 1];
offset -= imgRowSize;
}
}
// replacing queue items
fnArray.splice(j, count * 4, OPS.paintInlineImageXObjectGroup);
argsArray.splice(j, count * 4,
[{ width: imgWidth, height: imgHeight, kind: ImageKind.RGBA_32BPP,
data: imgData }, map]);
context.currentOperation = j;
});
addState(InitialState,
[OPS.save, OPS.transform, OPS.paintImageMaskXObject, OPS.restore],
function foundImageMaskGroup(context) {
// grouping paintImageMaskXObject's into paintImageMaskXObjectGroup
// searching for (save, transform, paintImageMaskXObject, restore)+
var MIN_IMAGES_IN_MASKS_BLOCK = 10;
var MAX_IMAGES_IN_MASKS_BLOCK = 100;
var MAX_SAME_IMAGES_IN_MASKS_BLOCK = 1000;
var fnArray = context.fnArray, argsArray = context.argsArray;
var j = context.currentOperation - 3, i = j + 4;
var ii = fnArray.length, q;
for (; i < ii && fnArray[i - 4] === fnArray[i]; i++) {}
var count = (i - j) >> 2;
count = handlePaintSolidColorImageMask(j, count, fnArray, argsArray);
if (count < MIN_IMAGES_IN_MASKS_BLOCK) {
context.currentOperation = i - 1;
return;
}
var isSameImage = false;
var transformArgs;
if (argsArray[j + 1][1] === 0 && argsArray[j + 1][2] === 0) {
i = j + 4;
isSameImage = true;
for (q = 1; q < count; q++, i += 4) {
var prevTransformArgs = argsArray[i - 3];
transformArgs = argsArray[i + 1];
if (argsArray[i - 2][0] !== argsArray[i + 2][0] ||
prevTransformArgs[0] !== transformArgs[0] ||
prevTransformArgs[1] !== transformArgs[1] ||
prevTransformArgs[2] !== transformArgs[2] ||
prevTransformArgs[3] !== transformArgs[3]) {
if (q < MIN_IMAGES_IN_MASKS_BLOCK) {
isSameImage = false;
} else {
count = q;
}
break; // different image or transform
}
}
}
if (isSameImage) {
count = Math.min(count, MAX_SAME_IMAGES_IN_MASKS_BLOCK);
var positions = new Float32Array(count * 2);
i = j + 1;
for (q = 0; q < count; q++) {
transformArgs = argsArray[i];
positions[(q << 1)] = transformArgs[4];
positions[(q << 1) + 1] = transformArgs[5];
i += 4;
}
// replacing queue items
fnArray.splice(j, count * 4, OPS.paintImageMaskXObjectRepeat);
argsArray.splice(j, count * 4, [argsArray[j + 2][0],
argsArray[j + 1][0], argsArray[j + 1][3], positions]);
context.currentOperation = j;
} else {
count = Math.min(count, MAX_IMAGES_IN_MASKS_BLOCK);
var images = [];
for (q = 0; q < count; q++) {
transformArgs = argsArray[j + (q << 2) + 1];
var maskParams = argsArray[j + (q << 2) + 2][0];
images.push({ data: maskParams.data, width: maskParams.width,
height: maskParams.height,
transform: transformArgs });
}
// replacing queue items
fnArray.splice(j, count * 4, OPS.paintImageMaskXObjectGroup);
argsArray.splice(j, count * 4, [images]);
context.currentOperation = j;
}
});
addState(InitialState,
[OPS.save, OPS.transform, OPS.paintImageXObject, OPS.restore],
function (context) {
var MIN_IMAGES_IN_BLOCK = 3;
var MAX_IMAGES_IN_BLOCK = 1000;
var fnArray = context.fnArray, argsArray = context.argsArray;
var j = context.currentOperation - 3, i = j + 4;
if (argsArray[j + 1][1] !== 0 || argsArray[j + 1][2] !== 0) {
return;
}
var ii = fnArray.length;
var transformArgs;
for (; i + 3 < ii && fnArray[i - 4] === fnArray[i]; i += 4) {
if (fnArray[i - 3] !== fnArray[i + 1] ||
fnArray[i - 2] !== fnArray[i + 2] ||
fnArray[i - 1] !== fnArray[i + 3]) {
break;
}
if (argsArray[i - 2][0] !== argsArray[i + 2][0]) {
break; // different image
}
var prevTransformArgs = argsArray[i - 3];
transformArgs = argsArray[i + 1];
if (prevTransformArgs[0] !== transformArgs[0] ||
prevTransformArgs[1] !== transformArgs[1] ||
prevTransformArgs[2] !== transformArgs[2] ||
prevTransformArgs[3] !== transformArgs[3]) {
break; // different transform
}
}
var count = Math.min((i - j) >> 2, MAX_IMAGES_IN_BLOCK);
if (count < MIN_IMAGES_IN_BLOCK) {
context.currentOperation = i - 1;
return;
}
var positions = new Float32Array(count * 2);
i = j + 1;
for (var q = 0; q < count; q++) {
transformArgs = argsArray[i];
positions[(q << 1)] = transformArgs[4];
positions[(q << 1) + 1] = transformArgs[5];
i += 4;
}
var args = [argsArray[j + 2][0], argsArray[j + 1][0],
argsArray[j + 1][3], positions];
// replacing queue items
fnArray.splice(j, count * 4, OPS.paintImageXObjectRepeat);
argsArray.splice(j, count * 4, args);
context.currentOperation = j;
});
addState(InitialState,
[OPS.beginText, OPS.setFont, OPS.setTextMatrix, OPS.showText, OPS.endText],
function (context) {
// moving single chars with same font into beginText/endText groups
// searching for (beginText, setFont, setTextMatrix, showText, endText)+
var MIN_CHARS_IN_BLOCK = 3;
var MAX_CHARS_IN_BLOCK = 1000;
var fnArray = context.fnArray, argsArray = context.argsArray;
var j = context.currentOperation - 4, i = j + 5;
var ii = fnArray.length;
for (; i < ii && fnArray[i - 5] === fnArray[i]; i++) {
if (fnArray[i] === OPS.setFont) {
if (argsArray[i - 5][0] !== argsArray[i][0] ||
argsArray[i - 5][1] !== argsArray[i][1]) {
break;
}
}
}
var count = Math.min(((i - j) / 5) | 0, MAX_CHARS_IN_BLOCK);
if (count < MIN_CHARS_IN_BLOCK) {
context.currentOperation = i - 1;
return;
}
if (j >= 4 && fnArray[j - 4] === fnArray[j + 1] &&
fnArray[j - 3] === fnArray[j + 2] &&
fnArray[j - 2] === fnArray[j + 3] &&
fnArray[j - 1] === fnArray[j + 4] &&
argsArray[j - 4][0] === argsArray[j + 1][0] &&
argsArray[j - 4][1] === argsArray[j + 1][1]) {
// extending one block ahead (very first block might have 'dependency')
count++;
j -= 5;
}
var k = j + 7;
i = j + 4;
for (var q = 1; q < count; q++) {
fnArray[i] = fnArray[k];
argsArray[i] = argsArray[k];
fnArray[i + 1] = fnArray[k + 1];
argsArray[i + 1] = argsArray[k + 1];
i += 2;
k += 5;
}
var removed = (count - 1) * 3;
fnArray.splice(i, removed);
argsArray.splice(i, removed);
context.currentOperation = i;
});
function QueueOptimizer() {}
QueueOptimizer.prototype = {
optimize: function QueueOptimizer_optimize(queue) {
var fnArray = queue.fnArray, argsArray = queue.argsArray;
var context = {
currentOperation: 0,
fnArray: fnArray,
argsArray: argsArray
};
var i, ii = argsArray.length;
var state;
for (i = 0; i < ii; i++) {
state = (state || InitialState)[fnArray[i]];
if (typeof state === 'function') { // we found some handler
context.currentOperation = i;
state = state(context);
i = context.currentOperation;
ii = context.fnArray.length;
}
}
}
};
return QueueOptimizer;
})();