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Split files into worker and main thread pieces.

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Brendan Dahl 2013-08-12 10:48:06 -07:00
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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 CanvasGraphics, combineUrl, createScratchCanvas, error, ErrorFont,
Font, FontLoader, globalScope, info, isArrayBuffer, loadJpegStream,
MessageHandler, PDFJS, PDFObjects, Promise, StatTimer, warn,
WorkerMessageHandler, PasswordResponses, Util */
'use strict';
/**
* The maximum allowed image size in total pixels e.g. width * height. Images
* above this value will not be drawn. Use -1 for no limit.
* @var {Number}
*/
PDFJS.maxImageSize = PDFJS.maxImageSize === undefined ? -1 : PDFJS.maxImageSize;
/**
* This is the main entry point for loading a PDF and interacting with it.
* NOTE: If a URL is used to fetch the PDF data a standard XMLHttpRequest(XHR)
* is used, which means it must follow the same origin rules that any XHR does
* e.g. No cross domain requests without CORS.
*
* @param {string|TypedAray|object} source Can be an url to where a PDF is
* located, a typed array (Uint8Array) already populated with data or
* and parameter object with the following possible fields:
* - url - The URL of the PDF.
* - data - A typed array with PDF data.
* - httpHeaders - Basic authentication headers.
* - password - For decrypting password-protected PDFs.
*
* @param {object} pdfDataRangeTransport is optional. It is used if you want
* to manually serve range requests for data in the PDF. See viewer.js for
* an example of pdfDataRangeTransport's interface.
*
* @param {function} passwordCallback is optional. It is used to request a
* password if wrong or no password was provided. The callback receives two
* parameters: function that needs to be called with new password and reason
* (see {PasswordResponses}).
*
* @return {Promise} A promise that is resolved with {PDFDocumentProxy} object.
*/
PDFJS.getDocument = function getDocument(source,
pdfDataRangeTransport,
passwordCallback,
progressCallback) {
var workerInitializedPromise, workerReadyPromise, transport;
if (typeof source === 'string') {
source = { url: source };
} else if (isArrayBuffer(source)) {
source = { data: source };
} else if (typeof source !== 'object') {
error('Invalid parameter in getDocument, need either Uint8Array, ' +
'string or a parameter object');
}
if (!source.url && !source.data)
error('Invalid parameter array, need either .data or .url');
// copy/use all keys as is except 'url' -- full path is required
var params = {};
for (var key in source) {
if (key === 'url' && typeof window !== 'undefined') {
params[key] = combineUrl(window.location.href, source[key]);
continue;
}
params[key] = source[key];
}
workerInitializedPromise = new PDFJS.Promise();
workerReadyPromise = new PDFJS.Promise();
transport = new WorkerTransport(workerInitializedPromise,
workerReadyPromise, pdfDataRangeTransport, progressCallback);
workerInitializedPromise.then(function transportInitialized() {
transport.passwordCallback = passwordCallback;
transport.fetchDocument(params);
});
return workerReadyPromise;
};
/**
* Proxy to a PDFDocument in the worker thread. Also, contains commonly used
* properties that can be read synchronously.
*/
var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
function PDFDocumentProxy(pdfInfo, transport) {
this.pdfInfo = pdfInfo;
this.transport = transport;
}
PDFDocumentProxy.prototype = {
/**
* @return {number} Total number of pages the PDF contains.
*/
get numPages() {
return this.pdfInfo.numPages;
},
/**
* @return {string} A unique ID to identify a PDF. Not guaranteed to be
* unique.
*/
get fingerprint() {
return this.pdfInfo.fingerprint;
},
/**
* @return {boolean} true if embedded document fonts are in use. Will be
* set during rendering of the pages.
*/
get embeddedFontsUsed() {
return this.transport.embeddedFontsUsed;
},
/**
* @param {number} The page number to get. The first page is 1.
* @return {Promise} A promise that is resolved with a {PDFPageProxy}
* object.
*/
getPage: function PDFDocumentProxy_getPage(number) {
return this.transport.getPage(number);
},
/**
* @return {Promise} A promise that is resolved with a lookup table for
* mapping named destinations to reference numbers.
*/
getDestinations: function PDFDocumentProxy_getDestinations() {
return this.transport.getDestinations();
},
/**
* @return {Promise} A promise that is resolved with an array of all the
* JavaScript strings in the name tree.
*/
getJavaScript: function PDFDocumentProxy_getDestinations() {
var promise = new PDFJS.Promise();
var js = this.pdfInfo.javaScript;
promise.resolve(js);
return promise;
},
/**
* @return {Promise} A promise that is resolved with an {array} that is a
* tree outline (if it has one) of the PDF. The tree is in the format of:
* [
* {
* title: string,
* bold: boolean,
* italic: boolean,
* color: rgb array,
* dest: dest obj,
* items: array of more items like this
* },
* ...
* ].
*/
getOutline: function PDFDocumentProxy_getOutline() {
var promise = new PDFJS.Promise();
var outline = this.pdfInfo.outline;
promise.resolve(outline);
return promise;
},
/**
* @return {Promise} A promise that is resolved with an {object} that has
* info and metadata properties. Info is an {object} filled with anything
* available in the information dictionary and similarly metadata is a
* {Metadata} object with information from the metadata section of the PDF.
*/
getMetadata: function PDFDocumentProxy_getMetadata() {
var promise = new PDFJS.Promise();
var info = this.pdfInfo.info;
var metadata = this.pdfInfo.metadata;
promise.resolve({
info: info,
metadata: metadata ? new PDFJS.Metadata(metadata) : null
});
return promise;
},
isEncrypted: function PDFDocumentProxy_isEncrypted() {
var promise = new PDFJS.Promise();
promise.resolve(this.pdfInfo.encrypted);
return promise;
},
/**
* @return {Promise} A promise that is resolved with a TypedArray that has
* the raw data from the PDF.
*/
getData: function PDFDocumentProxy_getData() {
var promise = new PDFJS.Promise();
this.transport.getData(promise);
return promise;
},
/**
* @return {Promise} A promise that is resolved when the document's data
* is loaded
*/
dataLoaded: function PDFDocumentProxy_dataLoaded() {
return this.transport.dataLoaded();
},
destroy: function PDFDocumentProxy_destroy() {
this.transport.destroy();
}
};
return PDFDocumentProxy;
})();
var PDFPageProxy = (function PDFPageProxyClosure() {
function PDFPageProxy(pageInfo, transport) {
this.pageInfo = pageInfo;
this.transport = transport;
this.stats = new StatTimer();
this.stats.enabled = !!globalScope.PDFJS.enableStats;
this.commonObjs = transport.commonObjs;
this.objs = new PDFObjects();
this.receivingOperatorList = false;
this.cleanupAfterRender = false;
this.pendingDestroy = false;
this.renderTasks = [];
}
PDFPageProxy.prototype = {
/**
* @return {number} Page number of the page. First page is 1.
*/
get pageNumber() {
return this.pageInfo.pageIndex + 1;
},
/**
* @return {number} The number of degrees the page is rotated clockwise.
*/
get rotate() {
return this.pageInfo.rotate;
},
/**
* @return {object} The reference that points to this page. It has 'num' and
* 'gen' properties.
*/
get ref() {
return this.pageInfo.ref;
},
/**
* @return {array} An array of the visible portion of the PDF page in the
* user space units - [x1, y1, x2, y2].
*/
get view() {
return this.pageInfo.view;
},
/**
* @param {number} scale The desired scale of the viewport.
* @param {number} rotate Degrees to rotate the viewport. If omitted this
* defaults to the page rotation.
* @return {PageViewport} Contains 'width' and 'height' properties along
* with transforms required for rendering.
*/
getViewport: function PDFPageProxy_getViewport(scale, rotate) {
if (arguments.length < 2)
rotate = this.rotate;
return new PDFJS.PageViewport(this.view, scale, rotate, 0, 0);
},
/**
* @return {Promise} A promise that is resolved with an {array} of the
* annotation objects.
*/
getAnnotations: function PDFPageProxy_getAnnotations() {
if (this.annotationsPromise)
return this.annotationsPromise;
var promise = new PDFJS.Promise();
this.annotationsPromise = promise;
this.transport.getAnnotations(this.pageInfo.pageIndex);
return promise;
},
/**
* Begins the process of rendering a page to the desired context.
* @param {object} params A parameter object that supports:
* {
* canvasContext(required): A 2D context of a DOM Canvas object.,
* textLayer(optional): An object that has beginLayout, endLayout, and
* appendText functions.,
* imageLayer(optional): An object that has beginLayout, endLayout and
* appendImage functions.,
* continueCallback(optional): A function that will be called each time
* the rendering is paused. To continue
* rendering call the function that is the
* first argument to the callback.
* }.
* @return {RenderTask} An extended promise that is resolved when the page
* finishes rendering (see RenderTask).
*/
render: function PDFPageProxy_render(params) {
var stats = this.stats;
stats.time('Overall');
// If there was a pending destroy cancel it so no cleanup happens during
// this call to render.
this.pendingDestroy = false;
// If there is no displayReadyPromise yet, then the operatorList was never
// requested before. Make the request and create the promise.
if (!this.displayReadyPromise) {
this.receivingOperatorList = true;
this.displayReadyPromise = new Promise();
this.operatorList = {
fnArray: [],
argsArray: [],
lastChunk: false
};
this.stats.time('Page Request');
this.transport.messageHandler.send('RenderPageRequest', {
pageIndex: this.pageNumber - 1
});
}
var internalRenderTask = new InternalRenderTask(complete, params,
this.objs, this.commonObjs,
this.operatorList, this.pageNumber);
this.renderTasks.push(internalRenderTask);
var renderTask = new RenderTask(internalRenderTask);
var self = this;
this.displayReadyPromise.then(
function pageDisplayReadyPromise(transparency) {
if (self.pendingDestroy) {
complete();
return;
}
stats.time('Rendering');
internalRenderTask.initalizeGraphics(transparency);
internalRenderTask.operatorListChanged();
},
function pageDisplayReadPromiseError(reason) {
complete(reason);
}
);
function complete(error) {
var i = self.renderTasks.indexOf(internalRenderTask);
if (i >= 0) {
self.renderTasks.splice(i, 1);
}
if (self.cleanupAfterRender) {
self.pendingDestroy = true;
}
self._tryDestroy();
if (error) {
renderTask.reject(error);
} else {
renderTask.resolve();
}
stats.timeEnd('Rendering');
stats.timeEnd('Overall');
}
return renderTask;
},
/**
* @return {Promise} That is resolved with the a {string} that is the text
* content from the page.
*/
getTextContent: function PDFPageProxy_getTextContent() {
var promise = new PDFJS.Promise();
this.transport.messageHandler.send('GetTextContent', {
pageIndex: this.pageNumber - 1
},
function textContentCallback(textContent) {
promise.resolve(textContent);
}
);
return promise;
},
/**
* Stub for future feature.
*/
getOperationList: function PDFPageProxy_getOperationList() {
var promise = new PDFJS.Promise();
var operationList = { // not implemented
dependencyFontsID: null,
operatorList: null
};
promise.resolve(operationList);
return promise;
},
/**
* Destroys resources allocated by the page.
*/
destroy: function PDFPageProxy_destroy() {
this.pendingDestroy = true;
this._tryDestroy();
},
/**
* For internal use only. Attempts to clean up if rendering is in a state
* where that's possible.
*/
_tryDestroy: function PDFPageProxy__destroy() {
if (!this.pendingDestroy ||
this.renderTasks.length !== 0 ||
this.receivingOperatorList) {
return;
}
delete this.operatorList;
delete this.displayReadyPromise;
this.objs.clear();
this.pendingDestroy = false;
},
/**
* For internal use only.
*/
_startRenderPage: function PDFPageProxy_startRenderPage(transparency) {
this.displayReadyPromise.resolve(transparency);
},
/**
* For internal use only.
*/
_renderPageChunk: function PDFPageProxy_renderPageChunk(operatorListChunk) {
// Add the new chunk to the current operator list.
Util.concatenateToArray(this.operatorList.fnArray,
operatorListChunk.fnArray);
Util.concatenateToArray(this.operatorList.argsArray,
operatorListChunk.argsArray);
this.operatorList.lastChunk = operatorListChunk.lastChunk;
// Notify all the rendering tasks there are more operators to be consumed.
for (var i = 0; i < this.renderTasks.length; i++) {
this.renderTasks[i].operatorListChanged();
}
if (operatorListChunk.lastChunk) {
this.receivingOperatorList = false;
this._tryDestroy();
}
}
};
return PDFPageProxy;
})();
/**
* For internal use only.
*/
var WorkerTransport = (function WorkerTransportClosure() {
function WorkerTransport(workerInitializedPromise, workerReadyPromise,
pdfDataRangeTransport, progressCallback) {
this.pdfDataRangeTransport = pdfDataRangeTransport;
this.workerReadyPromise = workerReadyPromise;
this.progressCallback = progressCallback;
this.commonObjs = new PDFObjects();
this.pageCache = [];
this.pagePromises = [];
this.embeddedFontsUsed = false;
this.passwordCallback = null;
// If worker support isn't disabled explicit and the browser has worker
// support, create a new web worker and test if it/the browser fullfills
// all requirements to run parts of pdf.js in a web worker.
// Right now, the requirement is, that an Uint8Array is still an Uint8Array
// as it arrives on the worker. Chrome added this with version 15.
if (!globalScope.PDFJS.disableWorker && typeof Worker !== 'undefined') {
var workerSrc = PDFJS.workerSrc;
if (typeof workerSrc === 'undefined') {
error('No PDFJS.workerSrc specified');
}
try {
// Some versions of FF can't create a worker on localhost, see:
// https://bugzilla.mozilla.org/show_bug.cgi?id=683280
var worker = new Worker(workerSrc);
var messageHandler = new MessageHandler('main', worker);
this.messageHandler = messageHandler;
messageHandler.on('test', function transportTest(supportTypedArray) {
if (supportTypedArray) {
this.worker = worker;
this.setupMessageHandler(messageHandler);
} else {
globalScope.PDFJS.disableWorker = true;
this.setupFakeWorker();
}
workerInitializedPromise.resolve();
}.bind(this));
var testObj = new Uint8Array(1);
// Some versions of Opera throw a DATA_CLONE_ERR on
// serializing the typed array.
messageHandler.send('test', testObj);
return;
} catch (e) {
info('The worker has been disabled.');
}
}
// Either workers are disabled, not supported or have thrown an exception.
// Thus, we fallback to a faked worker.
globalScope.PDFJS.disableWorker = true;
this.setupFakeWorker();
workerInitializedPromise.resolve();
}
WorkerTransport.prototype = {
destroy: function WorkerTransport_destroy() {
this.pageCache = [];
this.pagePromises = [];
var self = this;
this.messageHandler.send('Terminate', null, function () {
if (self.worker) {
self.worker.terminate();
}
});
},
setupFakeWorker: function WorkerTransport_setupFakeWorker() {
warn('Setting up fake worker.');
// If we don't use a worker, just post/sendMessage to the main thread.
var fakeWorker = {
postMessage: function WorkerTransport_postMessage(obj) {
fakeWorker.onmessage({data: obj});
},
terminate: function WorkerTransport_terminate() {}
};
var messageHandler = new MessageHandler('main', fakeWorker);
this.setupMessageHandler(messageHandler);
// If the main thread is our worker, setup the handling for the messages
// the main thread sends to it self.
WorkerMessageHandler.setup(messageHandler);
},
setupMessageHandler:
function WorkerTransport_setupMessageHandler(messageHandler) {
this.messageHandler = messageHandler;
function updatePassword(password) {
messageHandler.send('UpdatePassword', password);
}
var pdfDataRangeTransport = this.pdfDataRangeTransport;
if (pdfDataRangeTransport) {
pdfDataRangeTransport.addRangeListener(function(begin, chunk) {
messageHandler.send('OnDataRange', {
begin: begin,
chunk: chunk
});
});
pdfDataRangeTransport.addProgressListener(function(loaded) {
messageHandler.send('OnDataProgress', {
loaded: loaded
});
});
messageHandler.on('RequestDataRange',
function transportDataRange(data) {
pdfDataRangeTransport.requestDataRange(data.begin, data.end);
}, this);
}
messageHandler.on('GetDoc', function transportDoc(data) {
var pdfInfo = data.pdfInfo;
var pdfDocument = new PDFDocumentProxy(pdfInfo, this);
this.pdfDocument = pdfDocument;
this.workerReadyPromise.resolve(pdfDocument);
}, this);
messageHandler.on('NeedPassword', function transportPassword(data) {
if (this.passwordCallback) {
return this.passwordCallback(updatePassword,
PasswordResponses.NEED_PASSWORD);
}
this.workerReadyPromise.reject(data.exception.message, data.exception);
}, this);
messageHandler.on('IncorrectPassword', function transportBadPass(data) {
if (this.passwordCallback) {
return this.passwordCallback(updatePassword,
PasswordResponses.INCORRECT_PASSWORD);
}
this.workerReadyPromise.reject(data.exception.message, data.exception);
}, this);
messageHandler.on('InvalidPDF', function transportInvalidPDF(data) {
this.workerReadyPromise.reject(data.exception.name, data.exception);
}, this);
messageHandler.on('MissingPDF', function transportMissingPDF(data) {
this.workerReadyPromise.reject(data.exception.message, data.exception);
}, this);
messageHandler.on('UnknownError', function transportUnknownError(data) {
this.workerReadyPromise.reject(data.exception.message, data.exception);
}, this);
messageHandler.on('GetPage', function transportPage(data) {
var pageInfo = data.pageInfo;
var page = new PDFPageProxy(pageInfo, this);
this.pageCache[pageInfo.pageIndex] = page;
var promise = this.pagePromises[pageInfo.pageIndex];
promise.resolve(page);
}, this);
messageHandler.on('GetAnnotations', function transportAnnotations(data) {
var annotations = data.annotations;
var promise = this.pageCache[data.pageIndex].annotationsPromise;
promise.resolve(annotations);
}, this);
messageHandler.on('StartRenderPage', function transportRender(data) {
var page = this.pageCache[data.pageIndex];
page.stats.timeEnd('Page Request');
page._startRenderPage(data.transparency);
}, this);
messageHandler.on('RenderPageChunk', function transportRender(data) {
var page = this.pageCache[data.pageIndex];
page._renderPageChunk(data.operatorList);
}, this);
messageHandler.on('commonobj', function transportObj(data) {
var id = data[0];
var type = data[1];
if (this.commonObjs.hasData(id))
return;
switch (type) {
case 'Font':
var exportedData = data[2];
var font;
if ('error' in exportedData) {
var error = exportedData.error;
warn('Error during font loading: ' + error);
this.commonObjs.resolve(id, error);
break;
} else {
font = new Font(exportedData);
}
FontLoader.bind(
[font],
function fontReady(fontObjs) {
this.commonObjs.resolve(id, font);
}.bind(this)
);
break;
default:
error('Got unknown common object type ' + type);
}
}, this);
messageHandler.on('obj', function transportObj(data) {
var id = data[0];
var pageIndex = data[1];
var type = data[2];
var pageProxy = this.pageCache[pageIndex];
if (pageProxy.objs.hasData(id))
return;
switch (type) {
case 'JpegStream':
var imageData = data[3];
loadJpegStream(id, imageData, pageProxy.objs);
break;
case 'Image':
var imageData = data[3];
pageProxy.objs.resolve(id, imageData);
// heuristics that will allow not to store large data
var MAX_IMAGE_SIZE_TO_STORE = 8000000;
if ('data' in imageData &&
imageData.data.length > MAX_IMAGE_SIZE_TO_STORE) {
pageProxy.cleanupAfterRender = true;
}
break;
default:
error('Got unknown object type ' + type);
}
}, this);
messageHandler.on('DocProgress', function transportDocProgress(data) {
if (this.progressCallback) {
this.progressCallback({
loaded: data.loaded,
total: data.total
});
}
}, this);
messageHandler.on('DocError', function transportDocError(data) {
this.workerReadyPromise.reject(data);
}, this);
messageHandler.on('PageError', function transportError(data) {
var page = this.pageCache[data.pageNum - 1];
if (page.displayReadyPromise)
page.displayReadyPromise.reject(data.error);
else
error(data.error);
}, this);
messageHandler.on('JpegDecode', function(data, promise) {
var imageData = data[0];
var components = data[1];
if (components != 3 && components != 1)
error('Only 3 component or 1 component can be returned');
var img = new Image();
img.onload = (function messageHandler_onloadClosure() {
var width = img.width;
var height = img.height;
var size = width * height;
var rgbaLength = size * 4;
var buf = new Uint8Array(size * components);
var tmpCanvas = createScratchCanvas(width, height);
var tmpCtx = tmpCanvas.getContext('2d');
tmpCtx.drawImage(img, 0, 0);
var data = tmpCtx.getImageData(0, 0, width, height).data;
if (components == 3) {
for (var i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
buf[j] = data[i];
buf[j + 1] = data[i + 1];
buf[j + 2] = data[i + 2];
}
} else if (components == 1) {
for (var i = 0, j = 0; i < rgbaLength; i += 4, j++) {
buf[j] = data[i];
}
}
promise.resolve({ data: buf, width: width, height: height});
}).bind(this);
var src = 'data:image/jpeg;base64,' + window.btoa(imageData);
img.src = src;
});
},
fetchDocument: function WorkerTransport_fetchDocument(source) {
source.disableAutoFetch = PDFJS.disableAutoFetch;
source.chunkedViewerLoading = !!this.pdfDataRangeTransport;
this.messageHandler.send('GetDocRequest', {
source: source,
disableRange: PDFJS.disableRange,
maxImageSize: PDFJS.maxImageSize
});
},
getData: function WorkerTransport_getData(promise) {
this.messageHandler.send('GetData', null, function(data) {
promise.resolve(data);
});
},
dataLoaded: function WorkerTransport_dataLoaded() {
var promise = new PDFJS.Promise();
this.messageHandler.send('DataLoaded', null, function(args) {
promise.resolve(args);
});
return promise;
},
getPage: function WorkerTransport_getPage(pageNumber, promise) {
var pageIndex = pageNumber - 1;
if (pageIndex in this.pagePromises)
return this.pagePromises[pageIndex];
var promise = new PDFJS.Promise('Page ' + pageNumber);
this.pagePromises[pageIndex] = promise;
this.messageHandler.send('GetPageRequest', { pageIndex: pageIndex });
return promise;
},
getAnnotations: function WorkerTransport_getAnnotations(pageIndex) {
this.messageHandler.send('GetAnnotationsRequest',
{ pageIndex: pageIndex });
},
getDestinations: function WorkerTransport_getDestinations() {
var promise = new PDFJS.Promise();
this.messageHandler.send('GetDestinations', null,
function transportDestinations(destinations) {
promise.resolve(destinations);
}
);
return promise;
}
};
return WorkerTransport;
})();
/**
* RenderTask is basically a promise but adds a cancel function to terminate it.
*/
var RenderTask = (function RenderTaskClosure() {
function RenderTask(internalRenderTask) {
this.internalRenderTask = internalRenderTask;
Promise.call(this);
}
RenderTask.prototype = Object.create(Promise.prototype);
/**
* Cancel the rendering task. If the task is curently rendering it will not be
* cancelled until graphics pauses with a timeout. The promise that this
* object extends will resolved when cancelled.
*/
RenderTask.prototype.cancel = function RenderTask_cancel() {
this.internalRenderTask.cancel();
};
return RenderTask;
})();
var InternalRenderTask = (function InternalRenderTaskClosure() {
function InternalRenderTask(callback, params, objs, commonObjs, operatorList,
pageNumber) {
this.callback = callback;
this.params = params;
this.objs = objs;
this.commonObjs = commonObjs;
this.operatorListIdx = null;
this.operatorList = operatorList;
this.pageNumber = pageNumber;
this.running = false;
this.graphicsReadyCallback = null;
this.graphicsReady = false;
this.cancelled = false;
}
InternalRenderTask.prototype = {
initalizeGraphics:
function InternalRenderTask_initalizeGraphics(transparency) {
if (this.cancelled) {
return;
}
if (PDFJS.pdfBug && 'StepperManager' in globalScope &&
globalScope.StepperManager.enabled) {
this.stepper = globalScope.StepperManager.create(this.pageNumber - 1);
this.stepper.init(this.operatorList);
this.stepper.nextBreakPoint = this.stepper.getNextBreakPoint();
}
var params = this.params;
this.gfx = new CanvasGraphics(params.canvasContext, this.commonObjs,
this.objs, params.textLayer,
params.imageLayer);
this.gfx.beginDrawing(params.viewport, transparency);
this.operatorListIdx = 0;
this.graphicsReady = true;
if (this.graphicsReadyCallback) {
this.graphicsReadyCallback();
}
},
cancel: function InternalRenderTask_cancel() {
this.running = false;
this.cancelled = true;
this.callback('cancelled');
},
operatorListChanged: function InternalRenderTask_operatorListChanged() {
if (!this.graphicsReady) {
if (!this.graphicsReadyCallback) {
this.graphicsReadyCallback = this._continue.bind(this);
}
return;
}
if (this.stepper) {
this.stepper.updateOperatorList(this.operatorList);
}
if (this.running) {
return;
}
this._continue();
},
_continue: function InternalRenderTask__continue() {
this.running = true;
if (this.cancelled) {
return;
}
if (this.params.continueCallback) {
this.params.continueCallback(this._next.bind(this));
} else {
this._next();
}
},
_next: function InternalRenderTask__next() {
if (this.cancelled) {
return;
}
this.operatorListIdx = this.gfx.executeOperatorList(this.operatorList,
this.operatorListIdx,
this._continue.bind(this),
this.stepper);
if (this.operatorListIdx === this.operatorList.fnArray.length) {
this.running = false;
if (this.operatorList.lastChunk) {
this.gfx.endDrawing();
this.callback();
}
}
}
};
return InternalRenderTask;
})();