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

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/* 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 PDFJS */
'use strict';
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define('pdfjs/core/evaluator', ['exports', 'pdfjs/shared/util',
'pdfjs/core/primitives', 'pdfjs/core/stream', 'pdfjs/core/parser',
'pdfjs/core/image', 'pdfjs/core/colorspace', 'pdfjs/core/murmurhash3',
'pdfjs/core/fonts', 'pdfjs/core/function', 'pdfjs/core/pattern',
'pdfjs/core/cmap', 'pdfjs/core/metrics', 'pdfjs/core/bidi',
'pdfjs/core/encodings', 'pdfjs/core/standard_fonts',
'pdfjs/core/unicode'], factory);
} else if (typeof exports !== 'undefined') {
factory(exports, require('../shared/util.js'), require('./primitives.js'),
require('./stream.js'), require('./parser.js'), require('./image.js'),
require('./colorspace.js'), require('./murmurhash3.js'),
require('./fonts.js'), require('./function.js'), require('./pattern.js'),
require('./cmap.js'), require('./metrics.js'), require('./bidi.js'),
require('./encodings.js'), require('./standard_fonts.js'),
require('./unicode.js'));
} else {
factory((root.pdfjsCoreEvaluator = {}), root.pdfjsSharedUtil,
root.pdfjsCorePrimitives, root.pdfjsCoreStream, root.pdfjsCoreParser,
root.pdfjsCoreImage, root.pdfjsCoreColorSpace, root.pdfjsCoreMurmurHash3,
root.pdfjsCoreFonts, root.pdfjsCoreFunction, root.pdfjsCorePattern,
root.pdfjsCoreCMap, root.pdfjsCoreMetrics, root.pdfjsCoreBidi,
root.pdfjsCoreEncodings, root.pdfjsCoreStandardFonts,
root.pdfjsCoreUnicode);
}
}(this, function (exports, sharedUtil, corePrimitives, coreStream, coreParser,
coreImage, coreColorSpace, coreMurmurHash3, coreFonts,
coreFunction, corePattern, coreCMap, coreMetrics, coreBidi,
coreEncodings, coreStandardFonts, coreUnicode) {
var FONT_IDENTITY_MATRIX = sharedUtil.FONT_IDENTITY_MATRIX;
var IDENTITY_MATRIX = sharedUtil.IDENTITY_MATRIX;
var UNSUPPORTED_FEATURES = sharedUtil.UNSUPPORTED_FEATURES;
var ImageKind = sharedUtil.ImageKind;
var OPS = sharedUtil.OPS;
var TextRenderingMode = sharedUtil.TextRenderingMode;
var Util = sharedUtil.Util;
var assert = sharedUtil.assert;
var createPromiseCapability = sharedUtil.createPromiseCapability;
var error = sharedUtil.error;
var info = sharedUtil.info;
var isArray = sharedUtil.isArray;
var isNum = sharedUtil.isNum;
var isString = sharedUtil.isString;
var getLookupTableFactory = sharedUtil.getLookupTableFactory;
var warn = sharedUtil.warn;
var Dict = corePrimitives.Dict;
var Name = corePrimitives.Name;
var isCmd = corePrimitives.isCmd;
var isDict = corePrimitives.isDict;
var isName = corePrimitives.isName;
var isRef = corePrimitives.isRef;
var isStream = corePrimitives.isStream;
var DecodeStream = coreStream.DecodeStream;
var JpegStream = coreStream.JpegStream;
var Lexer = coreParser.Lexer;
var Parser = coreParser.Parser;
var isEOF = coreParser.isEOF;
var PDFImage = coreImage.PDFImage;
var ColorSpace = coreColorSpace.ColorSpace;
var MurmurHash3_64 = coreMurmurHash3.MurmurHash3_64;
var ErrorFont = coreFonts.ErrorFont;
var FontFlags = coreFonts.FontFlags;
var Font = coreFonts.Font;
var IdentityToUnicodeMap = coreFonts.IdentityToUnicodeMap;
var ToUnicodeMap = coreFonts.ToUnicodeMap;
var getFontType = coreFonts.getFontType;
var isPDFFunction = coreFunction.isPDFFunction;
var PDFFunction = coreFunction.PDFFunction;
var Pattern = corePattern.Pattern;
var getTilingPatternIR = corePattern.getTilingPatternIR;
var CMapFactory = coreCMap.CMapFactory;
var IdentityCMap = coreCMap.IdentityCMap;
var getMetrics = coreMetrics.getMetrics;
var bidi = coreBidi.bidi;
var WinAnsiEncoding = coreEncodings.WinAnsiEncoding;
var StandardEncoding = coreEncodings.StandardEncoding;
var MacRomanEncoding = coreEncodings.MacRomanEncoding;
var SymbolSetEncoding = coreEncodings.SymbolSetEncoding;
var ZapfDingbatsEncoding = coreEncodings.ZapfDingbatsEncoding;
var getEncoding = coreEncodings.getEncoding;
var getStdFontMap = coreStandardFonts.getStdFontMap;
var getSerifFonts = coreStandardFonts.getSerifFonts;
var getSymbolsFonts = coreStandardFonts.getSymbolsFonts;
var getNormalizedUnicodes = coreUnicode.getNormalizedUnicodes;
var reverseIfRtl = coreUnicode.reverseIfRtl;
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,
task,
initialState) {
var matrix = xobj.dict.getArray('Matrix');
var bbox = xobj.dict.getArray('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, task,
(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, imageCache) {
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 inverseDecode = (!!decode && decode[0] > 0);
imgData = PDFImage.createMask(imgArray, width, height,
image instanceof DecodeStream,
inverseDecode);
imgData.cached = true;
args = [imgData];
operatorList.addOp(OPS.paintImageMaskXObject, args);
if (cacheKey) {
imageCache[cacheKey] = {
fn: OPS.paintImageMaskXObject,
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(undefined, function (reason) {
warn('Unable to decode image: ' + reason);
self.handler.send('obj', [objId, self.pageIndex, 'Image', null]);
});
operatorList.addOp(OPS.paintImageXObject, args);
if (cacheKey) {
imageCache[cacheKey] = {
fn: OPS.paintImageXObject,
args: args
};
}
},
handleSMask: function PartialEvaluator_handleSmask(smask, resources,
operatorList, task,
stateManager) {
var smaskContent = smask.get('G');
var smaskOptions = {
subtype: smask.get('S').name,
backdrop: smask.get('BC')
};
// The SMask might have a alpha/luminosity value transfer function --
// we will build a map of integer values in range 0..255 to be fast.
var transferObj = smask.get('TR');
if (isPDFFunction(transferObj)) {
var transferFn = PDFFunction.parse(this.xref, transferObj);
var transferMap = new Uint8Array(256);
var tmp = new Float32Array(1);
for (var i = 0; i < 255; i++) {
tmp[0] = i / 255;
transferFn(tmp, 0, tmp, 0);
transferMap[i] = (tmp[0] * 255) | 0;
}
smaskOptions.transferMap = transferMap;
}
return this.buildFormXObject(resources, smaskContent, smaskOptions,
operatorList, task, stateManager.state.clone());
},
handleTilingType:
function PartialEvaluator_handleTilingType(fn, args, resources,
pattern, patternDict,
operatorList, task) {
// Create an IR of the pattern code.
var tilingOpList = new OperatorList();
// Merge the available resources, to prevent issues when the patternDict
// is missing some /Resources entries (fixes issue6541.pdf).
var resourcesArray = [patternDict.get('Resources'), resources];
var patternResources = Dict.merge(this.xref, resourcesArray);
return this.getOperatorList(pattern, task, patternResources,
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, task, 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, task).
then(function () {
return translated;
}, function (reason) {
// Error in the font data -- sending unsupported feature notification.
self.handler.send('UnsupportedFeature',
{featureId: UNSUPPORTED_FEATURES.font});
return new TranslatedFont('g_font_error',
new ErrorFont('Type3 font load error: ' + reason), translated.font);
});
}).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];
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, task,
xref, stateManager) {
// 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];
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,
task, 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,
task, stateManager);
});
gStateObj.push([key, true]);
} else {
warn('Unsupported SMask type');
}
break;
// Only generate info log messages for the following since
// they are unlikely 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;
}
}
return promise.then(function () {
if (gStateObj.length >= 0) {
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 (!fontRef) {
warn('fontRef 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_' + this.pdfManager.docId + '_f' + (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);
}
var self = this;
translatedPromise.then(function (translatedFont) {
if (translatedFont.fontType !== undefined) {
var xrefFontStats = xref.stats.fontTypes;
xrefFontStats[translatedFont.fontType] = true;
}
fontCapability.resolve(new TranslatedFont(font.loadedName,
translatedFont, font));
}, function (reason) {
// TODO fontCapability.reject?
// Error in the font data -- sending unsupported feature notification.
self.handler.send('UnsupportedFeature',
{featureId: UNSUPPORTED_FEATURES.font});
try {
// error, but it's still nice to have font type reported
var descriptor = preEvaluatedFont.descriptor;
var fontFile3 = descriptor && descriptor.get('FontFile3');
var subtype = fontFile3 && fontFile3.get('Subtype');
var fontType = getFontType(preEvaluatedFont.type,
subtype && subtype.name);
var xrefFontStats = xref.stats.fontTypes;
xrefFontStats[fontType] = true;
} catch (ex) { }
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 (!args) {
args = [];
}
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, task, 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, task);
} else if (typeNum === SHADING_PATTERN) {
var shading = dict.get('Shading');
var matrix = dict.get('Matrix');
pattern = Pattern.parseShading(shading, matrix, xref, resources,
this.handler);
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,
task,
resources,
operatorList,
initialState) {
var self = this;
var xref = this.xref;
var imageCache = Object.create(null);
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) {
task.ensureNotTerminated();
timeSlotManager.reset();
var stop, operation = {}, i, ii, cs;
while (!(stop = timeSlotManager.check())) {
// The arguments parsed by read() are used beyond this loop, so we
// cannot reuse the same array on each iteration. Therefore we pass
// in |null| as the initial value (see the comment on
// EvaluatorPreprocessor_read() for why).
operation.args = null;
if (!(preprocessor.read(operation))) {
break;
}
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 (!name) {
warn('XObject must be referred to by name.');
continue;
}
if (imageCache[name] !== undefined) {
operatorList.addOp(imageCache[name].fn, imageCache[name].args);
args = null;
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, task,
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 = null;
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,
task, 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) {
var cacheEntry = imageCache[cacheKey];
if (cacheEntry !== undefined) {
operatorList.addOp(cacheEntry.fn, cacheEntry.args);
args = null;
continue;
}
}
self.buildPaintImageXObject(resources, args[0], true,
operatorList, cacheKey, imageCache);
args = null;
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;
var state = stateManager.state;
for (i = 0; i < arrLength; ++i) {
var arrItem = arr[i];
if (isString(arrItem)) {
Array.prototype.push.apply(combinedGlyphs,
self.handleText(arrItem, 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, task, 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, task, 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, self.handler);
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, task,
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;
case OPS.rectangle:
self.buildPath(operatorList, fn, args);
continue;
case OPS.markPoint:
case OPS.markPointProps:
case OPS.beginMarkedContent:
case OPS.beginMarkedContentProps:
case OPS.endMarkedContent:
case OPS.beginCompat:
case OPS.endCompat:
// Ignore operators where the corresponding handlers are known to
// be no-op in CanvasGraphics (display/canvas.js). This prevents
// serialization errors and is also a bit more efficient.
// We could also try to serialize all objects in a general way,
// e.g. as done in https://github.com/mozilla/pdf.js/pull/6266,
// but doing so is meaningless without knowing the semantics.
continue;
default:
// Note: Let's hope that the ignored operator does not have any
// non-serializable arguments, otherwise postMessage will throw
// "An object could not be cloned.".
}
operatorList.addOp(fn, args);
}
if (stop) {
deferred.then(function () {
next(resolve, reject);
}, 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, task, resources,
stateManager,
normalizeWhitespace) {
stateManager = (stateManager || new StateManager(new TextState()));
var WhitespaceRegexp = /\s/g;
var textContent = {
items: [],
styles: Object.create(null)
};
var textContentItem = {
initialized: false,
str: [],
width: 0,
height: 0,
vertical: false,
lastAdvanceWidth: 0,
lastAdvanceHeight: 0,
textAdvanceScale: 0,
spaceWidth: 0,
fakeSpaceMin: Infinity,
fakeMultiSpaceMin: Infinity,
fakeMultiSpaceMax: -0,
textRunBreakAllowed: false,
transform: null,
fontName: null
};
var SPACE_FACTOR = 0.3;
var MULTI_SPACE_FACTOR = 1.5;
var MULTI_SPACE_FACTOR_MAX = 4;
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 = Object.create(null);
var preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
var textState;
function ensureTextContentItem() {
if (textContentItem.initialized) {
return textContentItem;
}
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
};
}
textContentItem.fontName = font.loadedName;
// 9.4.4 Text Space Details
var tsm = [textState.fontSize * textState.textHScale, 0,
0, textState.fontSize,
0, textState.textRise];
if (font.isType3Font &&
textState.fontMatrix !== FONT_IDENTITY_MATRIX &&
textState.fontSize === 1) {
var glyphHeight = font.bbox[3] - font.bbox[1];
if (glyphHeight > 0) {
glyphHeight = glyphHeight * textState.fontMatrix[3];
tsm[3] *= glyphHeight;
}
}
var trm = Util.transform(textState.ctm,
Util.transform(textState.textMatrix, tsm));
textContentItem.transform = trm;
if (!font.vertical) {
textContentItem.width = 0;
textContentItem.height = Math.sqrt(trm[2] * trm[2] + trm[3] * trm[3]);
textContentItem.vertical = false;
} else {
textContentItem.width = Math.sqrt(trm[0] * trm[0] + trm[1] * trm[1]);
textContentItem.height = 0;
textContentItem.vertical = true;
}
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);
textContentItem.textAdvanceScale = scaleCtmX * scaleLineX;
textContentItem.lastAdvanceWidth = 0;
textContentItem.lastAdvanceHeight = 0;
var spaceWidth = font.spaceWidth / 1000 * textState.fontSize;
if (spaceWidth) {
textContentItem.spaceWidth = spaceWidth;
textContentItem.fakeSpaceMin = spaceWidth * SPACE_FACTOR;
textContentItem.fakeMultiSpaceMin = spaceWidth * MULTI_SPACE_FACTOR;
textContentItem.fakeMultiSpaceMax =
spaceWidth * MULTI_SPACE_FACTOR_MAX;
// It's okay for monospace fonts to fake as much space as needed.
textContentItem.textRunBreakAllowed = !font.isMonospace;
} else {
textContentItem.spaceWidth = 0;
textContentItem.fakeSpaceMin = Infinity;
textContentItem.fakeMultiSpaceMin = Infinity;
textContentItem.fakeMultiSpaceMax = 0;
textContentItem.textRunBreakAllowed = false;
}
textContentItem.initialized = true;
return textContentItem;
}
function replaceWhitespace(str) {
// Replaces all whitespaces with standard spaces (0x20), to avoid
// alignment issues between the textLayer and the canvas if the text
// contains e.g. tabs (fixes issue6612.pdf).
var i = 0, ii = str.length, code;
while (i < ii && (code = str.charCodeAt(i)) >= 0x20 && code <= 0x7F) {
i++;
}
return (i < ii ? str.replace(WhitespaceRegexp, ' ') : str);
}
function runBidiTransform(textChunk) {
var str = textChunk.str.join('');
var bidiResult = PDFJS.bidi(str, -1, textChunk.vertical);
return {
str: (normalizeWhitespace ? replaceWhitespace(bidiResult.str) :
bidiResult.str),
dir: bidiResult.dir,
width: textChunk.width,
height: textChunk.height,
transform: textChunk.transform,
fontName: textChunk.fontName
};
}
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 buildTextContentItem(chars) {
var font = textState.font;
var textChunk = ensureTextContentItem();
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];
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;
var NormalizedUnicodes = getNormalizedUnicodes();
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 charSpacing = textState.charSpacing;
if (glyph.isSpace) {
var wordSpacing = textState.wordSpacing;
charSpacing += wordSpacing;
if (wordSpacing > 0) {
addFakeSpaces(wordSpacing, textChunk.str);
}
}
var tx = 0;
var ty = 0;
if (!font.vertical) {
var w0 = glyphWidth * textState.fontMatrix[0];
tx = (w0 * textState.fontSize + charSpacing) *
textState.textHScale;
width += tx;
} else {
var w1 = glyphWidth * textState.fontMatrix[0];
ty = w1 * textState.fontSize + charSpacing;
height += ty;
}
textState.translateTextMatrix(tx, ty);
textChunk.str.push(glyphUnicode);
}
if (!font.vertical) {
textChunk.lastAdvanceWidth = width;
textChunk.width += width * textChunk.textAdvanceScale;
} else {
textChunk.lastAdvanceHeight = height;
textChunk.height += Math.abs(height * textChunk.textAdvanceScale);
}
return textChunk;
}
function addFakeSpaces(width, strBuf) {
if (width < textContentItem.fakeSpaceMin) {
return;
}
if (width < textContentItem.fakeMultiSpaceMin) {
strBuf.push(' ');
return;
}
var fakeSpaces = Math.round(width / textContentItem.spaceWidth);
while (fakeSpaces-- > 0) {
strBuf.push(' ');
}
}
function flushTextContentItem() {
if (!textContentItem.initialized) {
return;
}
textContent.items.push(runBidiTransform(textContentItem));
textContentItem.initialized = false;
textContentItem.str.length = 0;
}
var timeSlotManager = new TimeSlotManager();
return new Promise(function next(resolve, reject) {
task.ensureNotTerminated();
timeSlotManager.reset();
var stop, operation = {}, args = [];
while (!(stop = timeSlotManager.check())) {
// The arguments parsed by read() are not used beyond this loop, so
// we can reuse the same array on every iteration, thus avoiding
// unnecessary allocations.
args.length = 0;
operation.args = args;
if (!(preprocessor.read(operation))) {
break;
}
textState = stateManager.state;
var fn = operation.fn;
args = operation.args;
var advance;
switch (fn | 0) {
case OPS.setFont:
flushTextContentItem();
textState.fontSize = args[1];
return handleSetFont(args[0].name).then(function() {
next(resolve, reject);
}, reject);
case OPS.setTextRise:
flushTextContentItem();
textState.textRise = args[0];
break;
case OPS.setHScale:
flushTextContentItem();
textState.textHScale = args[0] / 100;
break;
case OPS.setLeading:
flushTextContentItem();
textState.leading = args[0];
break;
case OPS.moveText:
// Optimization to treat same line movement as advance
var isSameTextLine = !textState.font ? false :
((textState.font.vertical ? args[0] : args[1]) === 0);
advance = args[0] - args[1];
if (isSameTextLine && textContentItem.initialized &&
advance > 0 &&
advance <= textContentItem.fakeMultiSpaceMax) {
textState.translateTextLineMatrix(args[0], args[1]);
textContentItem.width +=
(args[0] - textContentItem.lastAdvanceWidth);
textContentItem.height +=
(args[1] - textContentItem.lastAdvanceHeight);
var diff = (args[0] - textContentItem.lastAdvanceWidth) -
(args[1] - textContentItem.lastAdvanceHeight);
addFakeSpaces(diff, textContentItem.str);
break;
}
flushTextContentItem();
textState.translateTextLineMatrix(args[0], args[1]);
textState.textMatrix = textState.textLineMatrix.slice();
break;
case OPS.setLeadingMoveText:
flushTextContentItem();
textState.leading = -args[1];
textState.translateTextLineMatrix(args[0], args[1]);
textState.textMatrix = textState.textLineMatrix.slice();
break;
case OPS.nextLine:
flushTextContentItem();
textState.carriageReturn();
break;
case OPS.setTextMatrix:
flushTextContentItem();
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:
flushTextContentItem();
textState.textMatrix = IDENTITY_MATRIX.slice();
textState.textLineMatrix = IDENTITY_MATRIX.slice();
break;
case OPS.showSpacedText:
var items = args[0];
var offset;
for (var j = 0, jj = items.length; j < jj; j++) {
if (typeof items[j] === 'string') {
buildTextContentItem(items[j]);
} else {
ensureTextContentItem();
// PDF Specification 5.3.2 states:
// The number is expressed in thousandths of a unit of text
// space.
// This amount is subtracted from the current horizontal or
// vertical coordinate, depending on the writing mode.
// In the default coordinate system, a positive adjustment
// has the effect of moving the next glyph painted either to
// the left or down by the given amount.
advance = items[j] * textState.fontSize / 1000;
var breakTextRun = false;
if (textState.font.vertical) {
offset = advance *
(textState.textHScale * textState.textMatrix[2] +
textState.textMatrix[3]);
textState.translateTextMatrix(0, advance);
breakTextRun = textContentItem.textRunBreakAllowed &&
advance > textContentItem.fakeMultiSpaceMax;
if (!breakTextRun) {
// Value needs to be added to height to paint down.
textContentItem.height += offset;
}
} else {
advance = -advance;
offset = advance * (
textState.textHScale * textState.textMatrix[0] +
textState.textMatrix[1]);
textState.translateTextMatrix(advance, 0);
breakTextRun = textContentItem.textRunBreakAllowed &&
advance > textContentItem.fakeMultiSpaceMax;
if (!breakTextRun) {
// Value needs to be subtracted from width to paint left.
textContentItem.width += offset;
}
}
if (breakTextRun) {
flushTextContentItem();
} else if (advance > 0) {
addFakeSpaces(advance, textContentItem.str);
}
}
}
break;
case OPS.showText:
buildTextContentItem(args[0]);
break;
case OPS.nextLineShowText:
flushTextContentItem();
textState.carriageReturn();
buildTextContentItem(args[0]);
break;
case OPS.nextLineSetSpacingShowText:
flushTextContentItem();
textState.wordSpacing = args[0];
textState.charSpacing = args[1];
textState.carriageReturn();
buildTextContentItem(args[2]);
break;
case OPS.paintXObject:
flushTextContentItem();
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.appendToArray(textContent.items, 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, task,
xobj.dict.get('Resources') || resources, stateManager,
normalizeWhitespace).then(function (formTextContent) {
Util.appendToArray(textContent.items, formTextContent.items);
Util.extendObj(textContent.styles, formTextContent.styles);
stateManager.restore();
xobjsCache.key = name;
xobjsCache.texts = formTextContent;
next(resolve, reject);
}, reject);
case OPS.setGState:
flushTextContentItem();
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);
}, reject);
return;
}
flushTextContentItem();
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);
}
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 = xref.fetchIfRef(diffEncoding[j]);
if (isNum(data)) {
index = data;
} else if (isName(data)) {
differences[index++] = data.name;
} else {
error('Invalid entry in \'Differences\' array: ' + data);
}
}
}
} 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 = getEncoding(baseEncodingName).slice();
} else {
encoding = (properties.type === 'TrueType' ?
WinAnsiEncoding : 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 = MacRomanEncoding;
if (!properties.file) {
if (/Symbol/i.test(properties.name)) {
encoding = SymbolSetEncoding;
} else if (/Dingbats/i.test(properties.name)) {
encoding = ZapfDingbatsEncoding;
}
}
}
properties.defaultEncoding = encoding;
}
properties.differences = differences;
properties.baseEncodingName = baseEncodingName;
properties.dict = dict;
},
readToUnicode: function PartialEvaluator_readToUnicode(toUnicode) {
var cmap, cmapObj = toUnicode;
if (isName(cmapObj)) {
cmap = CMapFactory.create(cmapObj,
{ url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null);
if (cmap instanceof IdentityCMap) {
return new IdentityToUnicodeMap(0, 0xFFFF);
}
return new ToUnicodeMap(cmap.getMap());
} else if (isStream(cmapObj)) {
cmap = CMapFactory.create(cmapObj,
{ url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null);
if (cmap instanceof IdentityCMap) {
return new IdentityToUnicodeMap(0, 0xFFFF);
}
var map = new Array(cmap.length);
// Convert UTF-16BE
// NOTE: cmap can be a sparse array, so use forEach instead of for(;;)
// to iterate over all keys.
cmap.forEach(function(charCode, token) {
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);
}
map[charCode] = String.fromCharCode.apply(String, str);
});
return new ToUnicodeMap(map);
}
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 getSerifFonts()) ||
(fontNameWoStyle.search(/serif/gi) !== -1);
},
getBaseFontMetrics: function PartialEvaluator_getBaseFontMetrics(name) {
var defaultWidth = 0;
var widths = [];
var monospace = false;
var stdFontMap = getStdFontMap();
var lookupName = (stdFontMap[name] || name);
var Metrics = getMetrics();
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(); // expand lazy widths array
}
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);
} else if (isDict(encoding)) {
var keys = encoding.getKeys();
for (var i = 0, ii = keys.length; i < ii; i++) {
var entry = encoding.getRaw(keys[i]);
if (isName(entry)) {
hash.update(entry.name);
} else if (isRef(entry)) {
hash.update(entry.num + '_' + entry.gen);
} else if (isArray(entry)) { // 'Differences' entry.
// Ideally we should check the contents of the array, but to avoid
// parsing it here and then again in |extractDataStructures|,
// we only use the array length for now (fixes bug1157493.pdf).
hash.update(entry.length.toString());
}
}
}
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,
type: type.name,
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 = preEvaluatedFont.type;
var maxCharIndex = (composite ? 0xFFFF : 0xFF);
var properties;
if (!descriptor) {
if (type === '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));
descriptor.set('FontBBox', dict.get('FontBBox'));
} 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) |
(getSymbolsFonts()[fontNameWoStyle] ? FontFlags.Symbolic :
FontFlags.Nonsymbolic);
properties = {
type: type,
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 !== '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.indexOf(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: 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 === '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, task) {
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 = Object.create(null);
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, task, 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);
}, function (reason) {
warn('Type3 font resource \"' + key + '\" is not available');
var operatorList = new OperatorList();
charProcOperatorList[key] = operatorList.getIR();
});
}.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 = Object.create(null);
this._totalLength = 0;
this.pageIndex = pageIndex;
this.intent = intent;
}
OperatorList.prototype = {
get length() {
return this.argsArray.length;
},
/**
* @returns {number} The total length of the entire operator list,
* since `this.length === 0` after flushing.
*/
get totalLength() {
return (this._totalLength + this.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) {
if (this.intent !== 'oplist') {
new QueueOptimizer().optimize(this);
}
var transfers = getTransfers(this);
var length = this.length;
this._totalLength += length;
this.messageHandler.send('RenderPageChunk', {
operatorList: {
fnArray: this.fnArray,
argsArray: this.argsArray,
lastChunk: lastChunk,
length: length
},
pageIndex: this.pageIndex,
intent: this.intent
}, transfers);
this.dependencies = Object.create(null);
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 getOPMap = getLookupTableFactory(function (t) {
// Graphic state
t['w'] = { id: OPS.setLineWidth, numArgs: 1, variableArgs: false };
t['J'] = { id: OPS.setLineCap, numArgs: 1, variableArgs: false };
t['j'] = { id: OPS.setLineJoin, numArgs: 1, variableArgs: false };
t['M'] = { id: OPS.setMiterLimit, numArgs: 1, variableArgs: false };
t['d'] = { id: OPS.setDash, numArgs: 2, variableArgs: false };
t['ri'] = { id: OPS.setRenderingIntent, numArgs: 1, variableArgs: false };
t['i'] = { id: OPS.setFlatness, numArgs: 1, variableArgs: false };
t['gs'] = { id: OPS.setGState, numArgs: 1, variableArgs: false };
t['q'] = { id: OPS.save, numArgs: 0, variableArgs: false };
t['Q'] = { id: OPS.restore, numArgs: 0, variableArgs: false };
t['cm'] = { id: OPS.transform, numArgs: 6, variableArgs: false };
// Path
t['m'] = { id: OPS.moveTo, numArgs: 2, variableArgs: false };
t['l'] = { id: OPS.lineTo, numArgs: 2, variableArgs: false };
t['c'] = { id: OPS.curveTo, numArgs: 6, variableArgs: false };
t['v'] = { id: OPS.curveTo2, numArgs: 4, variableArgs: false };
t['y'] = { id: OPS.curveTo3, numArgs: 4, variableArgs: false };
t['h'] = { id: OPS.closePath, numArgs: 0, variableArgs: false };
t['re'] = { id: OPS.rectangle, numArgs: 4, variableArgs: false };
t['S'] = { id: OPS.stroke, numArgs: 0, variableArgs: false };
t['s'] = { id: OPS.closeStroke, numArgs: 0, variableArgs: false };
t['f'] = { id: OPS.fill, numArgs: 0, variableArgs: false };
t['F'] = { id: OPS.fill, numArgs: 0, variableArgs: false };
t['f*'] = { id: OPS.eoFill, numArgs: 0, variableArgs: false };
t['B'] = { id: OPS.fillStroke, numArgs: 0, variableArgs: false };
t['B*'] = { id: OPS.eoFillStroke, numArgs: 0, variableArgs: false };
t['b'] = { id: OPS.closeFillStroke, numArgs: 0, variableArgs: false };
t['b*'] = { id: OPS.closeEOFillStroke, numArgs: 0, variableArgs: false };
t['n'] = { id: OPS.endPath, numArgs: 0, variableArgs: false };
// Clipping
t['W'] = { id: OPS.clip, numArgs: 0, variableArgs: false };
t['W*'] = { id: OPS.eoClip, numArgs: 0, variableArgs: false };
// Text
t['BT'] = { id: OPS.beginText, numArgs: 0, variableArgs: false };
t['ET'] = { id: OPS.endText, numArgs: 0, variableArgs: false };
t['Tc'] = { id: OPS.setCharSpacing, numArgs: 1, variableArgs: false };
t['Tw'] = { id: OPS.setWordSpacing, numArgs: 1, variableArgs: false };
t['Tz'] = { id: OPS.setHScale, numArgs: 1, variableArgs: false };
t['TL'] = { id: OPS.setLeading, numArgs: 1, variableArgs: false };
t['Tf'] = { id: OPS.setFont, numArgs: 2, variableArgs: false };
t['Tr'] = { id: OPS.setTextRenderingMode, numArgs: 1, variableArgs: false };
t['Ts'] = { id: OPS.setTextRise, numArgs: 1, variableArgs: false };
t['Td'] = { id: OPS.moveText, numArgs: 2, variableArgs: false };
t['TD'] = { id: OPS.setLeadingMoveText, numArgs: 2, variableArgs: false };
t['Tm'] = { id: OPS.setTextMatrix, numArgs: 6, variableArgs: false };
t['T*'] = { id: OPS.nextLine, numArgs: 0, variableArgs: false };
t['Tj'] = { id: OPS.showText, numArgs: 1, variableArgs: false };
t['TJ'] = { id: OPS.showSpacedText, numArgs: 1, variableArgs: false };
t['\''] = { id: OPS.nextLineShowText, numArgs: 1, variableArgs: false };
t['"'] = { id: OPS.nextLineSetSpacingShowText, numArgs: 3,
variableArgs: false };
// Type3 fonts
t['d0'] = { id: OPS.setCharWidth, numArgs: 2, variableArgs: false };
t['d1'] = { id: OPS.setCharWidthAndBounds, numArgs: 6,
variableArgs: false };
// Color
t['CS'] = { id: OPS.setStrokeColorSpace, numArgs: 1, variableArgs: false };
t['cs'] = { id: OPS.setFillColorSpace, numArgs: 1, variableArgs: false };
t['SC'] = { id: OPS.setStrokeColor, numArgs: 4, variableArgs: true };
t['SCN'] = { id: OPS.setStrokeColorN, numArgs: 33, variableArgs: true };
t['sc'] = { id: OPS.setFillColor, numArgs: 4, variableArgs: true };
t['scn'] = { id: OPS.setFillColorN, numArgs: 33, variableArgs: true };
t['G'] = { id: OPS.setStrokeGray, numArgs: 1, variableArgs: false };
t['g'] = { id: OPS.setFillGray, numArgs: 1, variableArgs: false };
t['RG'] = { id: OPS.setStrokeRGBColor, numArgs: 3, variableArgs: false };
t['rg'] = { id: OPS.setFillRGBColor, numArgs: 3, variableArgs: false };
t['K'] = { id: OPS.setStrokeCMYKColor, numArgs: 4, variableArgs: false };
t['k'] = { id: OPS.setFillCMYKColor, numArgs: 4, variableArgs: false };
// Shading
t['sh'] = { id: OPS.shadingFill, numArgs: 1, variableArgs: false };
// Images
t['BI'] = { id: OPS.beginInlineImage, numArgs: 0, variableArgs: false };
t['ID'] = { id: OPS.beginImageData, numArgs: 0, variableArgs: false };
t['EI'] = { id: OPS.endInlineImage, numArgs: 1, variableArgs: false };
// XObjects
t['Do'] = { id: OPS.paintXObject, numArgs: 1, variableArgs: false };
t['MP'] = { id: OPS.markPoint, numArgs: 1, variableArgs: false };
t['DP'] = { id: OPS.markPointProps, numArgs: 2, variableArgs: false };
t['BMC'] = { id: OPS.beginMarkedContent, numArgs: 1, variableArgs: false };
t['BDC'] = { id: OPS.beginMarkedContentProps, numArgs: 2,
variableArgs: false };
t['EMC'] = { id: OPS.endMarkedContent, numArgs: 0, variableArgs: false };
// Compatibility
t['BX'] = { id: OPS.beginCompat, numArgs: 0, variableArgs: false };
t['EX'] = { id: OPS.endCompat, numArgs: 0, variableArgs: false };
// (reserved partial commands for the lexer)
t['BM'] = null;
t['BD'] = null;
t['true'] = null;
t['fa'] = null;
t['fal'] = null;
t['fals'] = null;
t['false'] = null;
t['nu'] = null;
t['nul'] = null;
t['null'] = null;
});
function EvaluatorPreprocessor(stream, xref, stateManager) {
this.opMap = getOPMap();
// TODO(mduan): pass array of knownCommands rather than this.opMap
// dictionary
this.parser = new Parser(new Lexer(stream, this.opMap), false, xref);
this.stateManager = stateManager;
this.nonProcessedArgs = [];
}
EvaluatorPreprocessor.prototype = {
get savedStatesDepth() {
return this.stateManager.stateStack.length;
},
// |operation| is an object with two fields:
//
// - |fn| is an out param.
//
// - |args| is an inout param. On entry, it should have one of two values.
//
// - An empty array. This indicates that the caller is providing the
// array in which the args will be stored in. The caller should use
// this value if it can reuse a single array for each call to read().
//
// - |null|. This indicates that the caller needs this function to create
// the array in which any args are stored in. If there are zero args,
// this function will leave |operation.args| as |null| (thus avoiding
// allocations that would occur if we used an empty array to represent
// zero arguments). Otherwise, it will replace |null| with a new array
// containing the arguments. The caller should use this value if it
// cannot reuse an array for each call to read().
//
// These two modes are present because this function is very hot and so
// avoiding allocations where possible is worthwhile.
//
read: function EvaluatorPreprocessor_read(operation) {
var args = operation.args;
while (true) {
var obj = this.parser.getObj();
if (isCmd(obj)) {
var cmd = obj.cmd;
// Check that the command is valid
var opSpec = this.opMap[cmd];
if (!opSpec) {
warn('Unknown command "' + cmd + '"');
continue;
}
var fn = opSpec.id;
var numArgs = opSpec.numArgs;
var argsLength = args !== null ? args.length : 0;
if (!opSpec.variableArgs) {
// Postscript commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
if (argsLength !== numArgs) {
var nonProcessedArgs = this.nonProcessedArgs;
while (argsLength > numArgs) {
nonProcessedArgs.push(args.shift());
argsLength--;
}
while (argsLength < numArgs && nonProcessedArgs.length !== 0) {
if (!args) {
args = [];
}
args.unshift(nonProcessedArgs.pop());
argsLength++;
}
}
if (argsLength < 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 ' + argsLength +
' args; skipping');
args = null;
continue;
}
} else if (argsLength > numArgs) {
info('Command ' + fn + ': expected [0,' + numArgs +
'] args, but received ' + argsLength + ' args');
}
// TODO figure out how to type-check vararg functions
this.preprocessCommand(fn, args);
operation.fn = fn;
operation.args = args;
return true;
} else {
if (isEOF(obj)) {
return false; // no more commands
}
// argument
if (obj !== null) {
if (!args) {
args = [];
}
args.push((obj instanceof Dict ? obj.getAll() : obj));
assert(args.length <= 33, 'Too many arguments');
}
}
}
},
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(iFirstSave, 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 iFirstSave.
var iFirstPIMXO = iFirstSave + 2;
for (var i = 0; i < count; i++) {
var arg = argsArray[iFirstPIMXO + 4 * i];
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[iFirstPIMXO + 4 * i] = OPS.paintSolidColorImageMask;
continue;
}
break;
}
return count - i;
}
var InitialState = [];
// This replaces (save, transform, paintInlineImageXObject, restore)+
// sequences with one |paintInlineImageXObjectGroup| operation.
addState(InitialState,
[OPS.save, OPS.transform, OPS.paintInlineImageXObject, OPS.restore],
function foundInlineImageGroup(context) {
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 curr = context.iCurr;
var iFirstSave = curr - 3;
var iFirstTransform = curr - 2;
var iFirstPIIXO = curr - 1;
// Look for the quartets.
var i = iFirstSave + 4;
var ii = fnArray.length;
while (i + 3 < ii) {
if (fnArray[i] !== OPS.save ||
fnArray[i + 1] !== OPS.transform ||
fnArray[i + 2] !== OPS.paintInlineImageXObject ||
fnArray[i + 3] !== OPS.restore) {
break; // ops don't match
}
i += 4;
}
// At this point, i is the index of the first op past the last valid
// quartet.
var count = Math.min((i - iFirstSave) / 4,
MAX_IMAGES_IN_INLINE_IMAGES_BLOCK);
if (count < MIN_IMAGES_IN_INLINE_IMAGES_BLOCK) {
return i;
}
// 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[iFirstTransform + (q << 2)];
var img = argsArray[iFirstPIIXO + (q << 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[iFirstPIIXO + (q << 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;
}
}
// Replace queue items.
fnArray.splice(iFirstSave, count * 4, OPS.paintInlineImageXObjectGroup);
argsArray.splice(iFirstSave, count * 4,
[{ width: imgWidth, height: imgHeight, kind: ImageKind.RGBA_32BPP,
data: imgData }, map]);
return iFirstSave + 1;
});
// This replaces (save, transform, paintImageMaskXObject, restore)+
// sequences with one |paintImageMaskXObjectGroup| or one
// |paintImageMaskXObjectRepeat| operation.
addState(InitialState,
[OPS.save, OPS.transform, OPS.paintImageMaskXObject, OPS.restore],
function foundImageMaskGroup(context) {
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 curr = context.iCurr;
var iFirstSave = curr - 3;
var iFirstTransform = curr - 2;
var iFirstPIMXO = curr - 1;
// Look for the quartets.
var i = iFirstSave + 4;
var ii = fnArray.length;
while (i + 3 < ii) {
if (fnArray[i] !== OPS.save ||
fnArray[i + 1] !== OPS.transform ||
fnArray[i + 2] !== OPS.paintImageMaskXObject ||
fnArray[i + 3] !== OPS.restore) {
break; // ops don't match
}
i += 4;
}
// At this point, i is the index of the first op past the last valid
// quartet.
var count = (i - iFirstSave) / 4;
count = handlePaintSolidColorImageMask(iFirstSave, count, fnArray,
argsArray);
if (count < MIN_IMAGES_IN_MASKS_BLOCK) {
return i;
}
var q;
var isSameImage = false;
var iTransform, transformArgs;
var firstPIMXOArg0 = argsArray[iFirstPIMXO][0];
if (argsArray[iFirstTransform][1] === 0 &&
argsArray[iFirstTransform][2] === 0) {
isSameImage = true;
var firstTransformArg0 = argsArray[iFirstTransform][0];
var firstTransformArg3 = argsArray[iFirstTransform][3];
iTransform = iFirstTransform + 4;
var iPIMXO = iFirstPIMXO + 4;
for (q = 1; q < count; q++, iTransform += 4, iPIMXO += 4) {
transformArgs = argsArray[iTransform];
if (argsArray[iPIMXO][0] !== firstPIMXOArg0 ||
transformArgs[0] !== firstTransformArg0 ||
transformArgs[1] !== 0 ||
transformArgs[2] !== 0 ||
transformArgs[3] !== firstTransformArg3) {
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);
iTransform = iFirstTransform;
for (q = 0; q < count; q++, iTransform += 4) {
transformArgs = argsArray[iTransform];
positions[(q << 1)] = transformArgs[4];
positions[(q << 1) + 1] = transformArgs[5];
}
// Replace queue items.
fnArray.splice(iFirstSave, count * 4, OPS.paintImageMaskXObjectRepeat);
argsArray.splice(iFirstSave, count * 4,
[firstPIMXOArg0, firstTransformArg0, firstTransformArg3, positions]);
} else {
count = Math.min(count, MAX_IMAGES_IN_MASKS_BLOCK);
var images = [];
for (q = 0; q < count; q++) {
transformArgs = argsArray[iFirstTransform + (q << 2)];
var maskParams = argsArray[iFirstPIMXO + (q << 2)][0];
images.push({ data: maskParams.data, width: maskParams.width,
height: maskParams.height,
transform: transformArgs });
}
// Replace queue items.
fnArray.splice(iFirstSave, count * 4, OPS.paintImageMaskXObjectGroup);
argsArray.splice(iFirstSave, count * 4, [images]);
}
return iFirstSave + 1;
});
// This replaces (save, transform, paintImageXObject, restore)+ sequences
// with one paintImageXObjectRepeat operation, if the |transform| and
// |paintImageXObjectRepeat| ops are appropriate.
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 curr = context.iCurr;
var iFirstSave = curr - 3;
var iFirstTransform = curr - 2;
var iFirstPIXO = curr - 1;
var iFirstRestore = curr;
if (argsArray[iFirstTransform][1] !== 0 ||
argsArray[iFirstTransform][2] !== 0) {
return iFirstRestore + 1; // transform has the wrong form
}
// Look for the quartets.
var firstPIXOArg0 = argsArray[iFirstPIXO][0];
var firstTransformArg0 = argsArray[iFirstTransform][0];
var firstTransformArg3 = argsArray[iFirstTransform][3];
var i = iFirstSave + 4;
var ii = fnArray.length;
while (i + 3 < ii) {
if (fnArray[i] !== OPS.save ||
fnArray[i + 1] !== OPS.transform ||
fnArray[i + 2] !== OPS.paintImageXObject ||
fnArray[i + 3] !== OPS.restore) {
break; // ops don't match
}
if (argsArray[i + 1][0] !== firstTransformArg0 ||
argsArray[i + 1][1] !== 0 ||
argsArray[i + 1][2] !== 0 ||
argsArray[i + 1][3] !== firstTransformArg3) {
break; // transforms don't match
}
if (argsArray[i + 2][0] !== firstPIXOArg0) {
break; // images don't match
}
i += 4;
}
// At this point, i is the index of the first op past the last valid
// quartet.
var count = Math.min((i - iFirstSave) / 4, MAX_IMAGES_IN_BLOCK);
if (count < MIN_IMAGES_IN_BLOCK) {
return i;
}
// Extract the (x,y) positions from all of the matching transforms.
var positions = new Float32Array(count * 2);
var iTransform = iFirstTransform;
for (var q = 0; q < count; q++, iTransform += 4) {
var transformArgs = argsArray[iTransform];
positions[(q << 1)] = transformArgs[4];
positions[(q << 1) + 1] = transformArgs[5];
}
// Replace queue items.
var args = [firstPIXOArg0, firstTransformArg0, firstTransformArg3,
positions];
fnArray.splice(iFirstSave, count * 4, OPS.paintImageXObjectRepeat);
argsArray.splice(iFirstSave, count * 4, args);
return iFirstSave + 1;
});
// This replaces (beginText, setFont, setTextMatrix, showText, endText)+
// sequences with (beginText, setFont, (setTextMatrix, showText)+, endText)+
// sequences, if the font for each one is the same.
addState(InitialState,
[OPS.beginText, OPS.setFont, OPS.setTextMatrix, OPS.showText, OPS.endText],
function (context) {
var MIN_CHARS_IN_BLOCK = 3;
var MAX_CHARS_IN_BLOCK = 1000;
var fnArray = context.fnArray, argsArray = context.argsArray;
var curr = context.iCurr;
var iFirstBeginText = curr - 4;
var iFirstSetFont = curr - 3;
var iFirstSetTextMatrix = curr - 2;
var iFirstShowText = curr - 1;
var iFirstEndText = curr;
// Look for the quintets.
var firstSetFontArg0 = argsArray[iFirstSetFont][0];
var firstSetFontArg1 = argsArray[iFirstSetFont][1];
var i = iFirstBeginText + 5;
var ii = fnArray.length;
while (i + 4 < ii) {
if (fnArray[i] !== OPS.beginText ||
fnArray[i + 1] !== OPS.setFont ||
fnArray[i + 2] !== OPS.setTextMatrix ||
fnArray[i + 3] !== OPS.showText ||
fnArray[i + 4] !== OPS.endText) {
break; // ops don't match
}
if (argsArray[i + 1][0] !== firstSetFontArg0 ||
argsArray[i + 1][1] !== firstSetFontArg1) {
break; // fonts don't match
}
i += 5;
}
// At this point, i is the index of the first op past the last valid
// quintet.
var count = Math.min(((i - iFirstBeginText) / 5), MAX_CHARS_IN_BLOCK);
if (count < MIN_CHARS_IN_BLOCK) {
return i;
}
// If the preceding quintet is (<something>, setFont, setTextMatrix,
// showText, endText), include that as well. (E.g. <something> might be
// |dependency|.)
var iFirst = iFirstBeginText;
if (iFirstBeginText >= 4 &&
fnArray[iFirstBeginText - 4] === fnArray[iFirstSetFont] &&
fnArray[iFirstBeginText - 3] === fnArray[iFirstSetTextMatrix] &&
fnArray[iFirstBeginText - 2] === fnArray[iFirstShowText] &&
fnArray[iFirstBeginText - 1] === fnArray[iFirstEndText] &&
argsArray[iFirstBeginText - 4][0] === firstSetFontArg0 &&
argsArray[iFirstBeginText - 4][1] === firstSetFontArg1) {
count++;
iFirst -= 5;
}
// Remove (endText, beginText, setFont) trios.
var iEndText = iFirst + 4;
for (var q = 1; q < count; q++) {
fnArray.splice(iEndText, 3);
argsArray.splice(iEndText, 3);
iEndText += 2;
}
return iEndText + 1;
});
function QueueOptimizer() {}
QueueOptimizer.prototype = {
optimize: function QueueOptimizer_optimize(queue) {
var fnArray = queue.fnArray, argsArray = queue.argsArray;
var context = {
iCurr: 0,
fnArray: fnArray,
argsArray: argsArray
};
var state;
var i = 0, ii = fnArray.length;
while (i < ii) {
state = (state || InitialState)[fnArray[i]];
if (typeof state === 'function') { // we found some handler
context.iCurr = i;
// state() returns the index of the first non-matching op (if we
// didn't match) or the first op past the modified ops (if we did
// match and replace).
i = state(context);
state = undefined; // reset the state machine
ii = context.fnArray.length;
} else {
i++;
}
}
}
};
return QueueOptimizer;
})();
exports.OperatorList = OperatorList;
exports.PartialEvaluator = PartialEvaluator;
}));