Convert PDFPageProxy, in src/display/api.js, to an ES6 class
This changes all occurrences of `var` to `let`/`const` in this code, and updates the signatures of a couple of methods to use object destructuring. Finally, when creating `InternalRenderTask` instances *only* the necessary parameter are now provided, since passing through the `RenderParameters` as-is seems completely unnecessary.
This commit is contained in:
Jonas Jenwald
parent
2c003a82d5
commit
5a0d64a6de
@ -850,385 +850,395 @@ class PDFDocumentProxy {
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/**
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* Proxy to a PDFPage in the worker thread.
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* @class
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* @alias PDFPageProxy
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*/
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var PDFPageProxy = (function PDFPageProxyClosure() {
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function PDFPageProxy(pageIndex, pageInfo, transport, pdfBug = false) {
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class PDFPageProxy {
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constructor(pageIndex, pageInfo, transport, pdfBug = false) {
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this.pageIndex = pageIndex;
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this._pageInfo = pageInfo;
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this.transport = transport;
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this._transport = transport;
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this._stats = (pdfBug ? new StatTimer() : DummyStatTimer);
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this._pdfBug = pdfBug;
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this.commonObjs = transport.commonObjs;
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this.objs = new PDFObjects();
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this.cleanupAfterRender = false;
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this.pendingCleanup = false;
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this.intentStates = Object.create(null);
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this.destroyed = false;
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}
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PDFPageProxy.prototype = /** @lends PDFPageProxy.prototype */ {
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/**
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* @return {number} Page number of the page. First page is 1.
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*/
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get pageNumber() {
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return this.pageIndex + 1;
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},
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/**
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* @return {number} The number of degrees the page is rotated clockwise.
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*/
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get rotate() {
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return this._pageInfo.rotate;
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},
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/**
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* @return {Object} The reference that points to this page. It has 'num' and
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* 'gen' properties.
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*/
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get ref() {
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return this._pageInfo.ref;
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},
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/**
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* @return {number} The default size of units in 1/72nds of an inch.
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*/
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get userUnit() {
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return this._pageInfo.userUnit;
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},
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/**
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* @return {Array} An array of the visible portion of the PDF page in the
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* user space units - [x1, y1, x2, y2].
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*/
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get view() {
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return this._pageInfo.view;
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},
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/**
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* @param {number} scale The desired scale of the viewport.
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* @param {number} rotate Degrees to rotate the viewport. If omitted this
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* defaults to the page rotation.
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* @param {boolean} dontFlip (optional) If true, axis Y will not be flipped.
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* @return {PageViewport} Contains 'width' and 'height' properties
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* along with transforms required for rendering.
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*/
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getViewport(scale, rotate = this.rotate, dontFlip = false) {
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return new PageViewport({
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viewBox: this.view,
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scale,
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rotation: rotate,
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dontFlip,
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});
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},
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/**
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* @param {GetAnnotationsParameters} params - Annotation parameters.
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* @return {Promise} A promise that is resolved with an {Array} of the
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* annotation objects.
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*/
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getAnnotations: function PDFPageProxy_getAnnotations(params) {
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var intent = (params && params.intent) || null;
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/**
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* @return {number} Page number of the page. First page is 1.
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*/
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get pageNumber() {
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return this.pageIndex + 1;
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}
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if (!this.annotationsPromise || this.annotationsIntent !== intent) {
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this.annotationsPromise = this.transport.getAnnotations(this.pageIndex,
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intent);
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this.annotationsIntent = intent;
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}
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return this.annotationsPromise;
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},
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/**
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* Begins the process of rendering a page to the desired context.
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* @param {RenderParameters} params Page render parameters.
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* @return {RenderTask} An object that contains the promise, which
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* is resolved when the page finishes rendering.
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*/
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render: function PDFPageProxy_render(params) {
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let stats = this._stats;
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stats.time('Overall');
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/**
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* @return {number} The number of degrees the page is rotated clockwise.
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*/
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get rotate() {
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return this._pageInfo.rotate;
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}
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// If there was a pending destroy cancel it so no cleanup happens during
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// this call to render.
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this.pendingCleanup = false;
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/**
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* @return {Object} The reference that points to this page. It has 'num' and
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* 'gen' properties.
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*/
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get ref() {
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return this._pageInfo.ref;
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}
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var renderingIntent = (params.intent === 'print' ? 'print' : 'display');
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var canvasFactory = params.canvasFactory || new DOMCanvasFactory();
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let webGLContext = new WebGLContext({
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enable: params.enableWebGL,
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});
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/**
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* @return {number} The default size of units in 1/72nds of an inch.
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*/
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get userUnit() {
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return this._pageInfo.userUnit;
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}
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if (!this.intentStates[renderingIntent]) {
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this.intentStates[renderingIntent] = Object.create(null);
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}
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var intentState = this.intentStates[renderingIntent];
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/**
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* @return {Array} An array of the visible portion of the PDF page in the
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* user space units - [x1, y1, x2, y2].
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*/
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get view() {
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return this._pageInfo.view;
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}
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// If there's no displayReadyCapability yet, then the operatorList
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// was never requested before. Make the request and create the promise.
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if (!intentState.displayReadyCapability) {
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intentState.receivingOperatorList = true;
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intentState.displayReadyCapability = createPromiseCapability();
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intentState.operatorList = {
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fnArray: [],
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argsArray: [],
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lastChunk: false,
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};
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/**
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* @param {number} scale The desired scale of the viewport.
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* @param {number} rotate Degrees to rotate the viewport. If omitted this
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* defaults to the page rotation.
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* @param {boolean} dontFlip (optional) If true, axis Y will not be flipped.
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* @return {PageViewport} Contains 'width' and 'height' properties
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* along with transforms required for rendering.
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*/
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getViewport(scale, rotate = this.rotate, dontFlip = false) {
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return new PageViewport({
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viewBox: this.view,
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scale,
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rotation: rotate,
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dontFlip,
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});
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}
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stats.time('Page Request');
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this.transport.messageHandler.send('RenderPageRequest', {
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pageIndex: this.pageNumber - 1,
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intent: renderingIntent,
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renderInteractiveForms: (params.renderInteractiveForms === true),
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});
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}
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/**
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* @param {GetAnnotationsParameters} params - Annotation parameters.
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* @return {Promise} A promise that is resolved with an {Array} of the
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* annotation objects.
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*/
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getAnnotations({ intent = null, } = {}) {
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if (!this.annotationsPromise || this.annotationsIntent !== intent) {
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this.annotationsPromise = this._transport.getAnnotations(this.pageIndex,
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intent);
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this.annotationsIntent = intent;
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}
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return this.annotationsPromise;
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}
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var complete = (error) => {
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var i = intentState.renderTasks.indexOf(internalRenderTask);
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if (i >= 0) {
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intentState.renderTasks.splice(i, 1);
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}
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/**
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* Begins the process of rendering a page to the desired context.
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* @param {RenderParameters} params Page render parameters.
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* @return {RenderTask} An object that contains the promise, which
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* is resolved when the page finishes rendering.
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*/
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render({ canvasContext, viewport, intent = 'display', enableWebGL = false,
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renderInteractiveForms = false, transform = null, imageLayer = null,
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canvasFactory = null, background = null, }) {
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const stats = this._stats;
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stats.time('Overall');
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if (this.cleanupAfterRender) {
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this.pendingCleanup = true;
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}
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this._tryCleanup();
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// If there was a pending destroy cancel it so no cleanup happens during
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// this call to render.
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this.pendingCleanup = false;
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if (error) {
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internalRenderTask.capability.reject(error);
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} else {
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internalRenderTask.capability.resolve();
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}
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stats.timeEnd('Rendering');
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stats.timeEnd('Overall');
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const renderingIntent = (intent === 'print' ? 'print' : 'display');
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const canvasFactoryInstance = canvasFactory || new DOMCanvasFactory();
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const webGLContext = new WebGLContext({
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enable: enableWebGL,
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});
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if (!this.intentStates[renderingIntent]) {
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this.intentStates[renderingIntent] = Object.create(null);
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}
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const intentState = this.intentStates[renderingIntent];
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// If there's no displayReadyCapability yet, then the operatorList
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// was never requested before. Make the request and create the promise.
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if (!intentState.displayReadyCapability) {
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intentState.receivingOperatorList = true;
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intentState.displayReadyCapability = createPromiseCapability();
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intentState.operatorList = {
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fnArray: [],
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argsArray: [],
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lastChunk: false,
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};
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var internalRenderTask = new InternalRenderTask(complete, params,
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stats.time('Page Request');
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this._transport.messageHandler.send('RenderPageRequest', {
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pageIndex: this.pageNumber - 1,
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intent: renderingIntent,
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renderInteractiveForms: renderInteractiveForms === true,
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});
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}
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const complete = (error) => {
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const i = intentState.renderTasks.indexOf(internalRenderTask);
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if (i >= 0) {
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intentState.renderTasks.splice(i, 1);
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}
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if (this.cleanupAfterRender) {
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this.pendingCleanup = true;
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}
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this._tryCleanup();
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if (error) {
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internalRenderTask.capability.reject(error);
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} else {
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internalRenderTask.capability.resolve();
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}
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stats.timeEnd('Rendering');
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stats.timeEnd('Overall');
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};
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const internalRenderTask = new InternalRenderTask(complete, {
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canvasContext,
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viewport,
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transform,
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imageLayer,
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background,
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},
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this.objs,
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this.commonObjs,
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intentState.operatorList,
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this.pageNumber,
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canvasFactory,
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canvasFactoryInstance,
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webGLContext,
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this._pdfBug);
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internalRenderTask.useRequestAnimationFrame = renderingIntent !== 'print';
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if (!intentState.renderTasks) {
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intentState.renderTasks = [];
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}
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intentState.renderTasks.push(internalRenderTask);
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var renderTask = internalRenderTask.task;
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internalRenderTask.useRequestAnimationFrame = renderingIntent !== 'print';
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if (!intentState.renderTasks) {
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intentState.renderTasks = [];
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}
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intentState.renderTasks.push(internalRenderTask);
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const renderTask = internalRenderTask.task;
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intentState.displayReadyCapability.promise.then((transparency) => {
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if (this.pendingCleanup) {
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complete();
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return;
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}
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stats.time('Rendering');
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internalRenderTask.initializeGraphics(transparency);
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internalRenderTask.operatorListChanged();
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}).catch(complete);
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return renderTask;
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},
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/**
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* @return {Promise} A promise resolved with an {@link PDFOperatorList}
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* object that represents page's operator list.
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*/
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getOperatorList: function PDFPageProxy_getOperatorList() {
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function operatorListChanged() {
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if (intentState.operatorList.lastChunk) {
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intentState.opListReadCapability.resolve(intentState.operatorList);
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var i = intentState.renderTasks.indexOf(opListTask);
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if (i >= 0) {
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intentState.renderTasks.splice(i, 1);
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}
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}
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}
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var renderingIntent = 'oplist';
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if (!this.intentStates[renderingIntent]) {
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this.intentStates[renderingIntent] = Object.create(null);
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}
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var intentState = this.intentStates[renderingIntent];
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var opListTask;
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if (!intentState.opListReadCapability) {
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opListTask = {};
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opListTask.operatorListChanged = operatorListChanged;
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intentState.receivingOperatorList = true;
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intentState.opListReadCapability = createPromiseCapability();
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intentState.renderTasks = [];
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intentState.renderTasks.push(opListTask);
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intentState.operatorList = {
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fnArray: [],
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argsArray: [],
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lastChunk: false,
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};
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this._stats.time('Page Request');
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this.transport.messageHandler.send('RenderPageRequest', {
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pageIndex: this.pageIndex,
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intent: renderingIntent,
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});
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}
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return intentState.opListReadCapability.promise;
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},
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/**
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* @param {getTextContentParameters} params - getTextContent parameters.
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* @return {ReadableStream} ReadableStream to read textContent chunks.
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*/
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streamTextContent(params = {}) {
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const TEXT_CONTENT_CHUNK_SIZE = 100;
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return this.transport.messageHandler.sendWithStream('GetTextContent', {
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pageIndex: this.pageNumber - 1,
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normalizeWhitespace: (params.normalizeWhitespace === true),
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combineTextItems: (params.disableCombineTextItems !== true),
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}, {
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highWaterMark: TEXT_CONTENT_CHUNK_SIZE,
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size(textContent) {
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return textContent.items.length;
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},
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});
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},
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/**
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* @param {getTextContentParameters} params - getTextContent parameters.
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* @return {Promise} That is resolved a {@link TextContent}
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* object that represent the page text content.
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*/
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getTextContent: function PDFPageProxy_getTextContent(params) {
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params = params || {};
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let readableStream = this.streamTextContent(params);
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return new Promise(function(resolve, reject) {
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function pump() {
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reader.read().then(function({ value, done, }) {
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if (done) {
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resolve(textContent);
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return;
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}
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Object.assign(textContent.styles, value.styles);
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textContent.items.push(...value.items);
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pump();
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}, reject);
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}
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let reader = readableStream.getReader();
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let textContent = {
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items: [],
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styles: Object.create(null),
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};
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pump();
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});
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},
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/**
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* Destroys page object.
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*/
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_destroy: function PDFPageProxy_destroy() {
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this.destroyed = true;
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this.transport.pageCache[this.pageIndex] = null;
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var waitOn = [];
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Object.keys(this.intentStates).forEach(function(intent) {
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if (intent === 'oplist') {
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// Avoid errors below, since the renderTasks are just stubs.
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return;
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}
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var intentState = this.intentStates[intent];
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intentState.renderTasks.forEach(function(renderTask) {
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var renderCompleted = renderTask.capability.promise.
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catch(function () {}); // ignoring failures
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waitOn.push(renderCompleted);
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renderTask.cancel();
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});
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}, this);
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this.objs.clear();
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this.annotationsPromise = null;
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this.pendingCleanup = false;
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return Promise.all(waitOn);
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},
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/**
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* Cleans up resources allocated by the page.
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* @param {boolean} resetStats - (optional) Reset page stats, if enabled.
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* The default value is `false`.
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*/
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cleanup(resetStats = false) {
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this.pendingCleanup = true;
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this._tryCleanup(resetStats);
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},
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/**
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* For internal use only. Attempts to clean up if rendering is in a state
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* where that's possible.
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* @ignore
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*/
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_tryCleanup(resetStats = false) {
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if (!this.pendingCleanup ||
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Object.keys(this.intentStates).some(function(intent) {
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var intentState = this.intentStates[intent];
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return (intentState.renderTasks.length !== 0 ||
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intentState.receivingOperatorList);
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}, this)) {
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intentState.displayReadyCapability.promise.then((transparency) => {
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if (this.pendingCleanup) {
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complete();
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return;
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}
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stats.time('Rendering');
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internalRenderTask.initializeGraphics(transparency);
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internalRenderTask.operatorListChanged();
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}).catch(complete);
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Object.keys(this.intentStates).forEach(function(intent) {
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delete this.intentStates[intent];
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}, this);
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this.objs.clear();
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this.annotationsPromise = null;
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if (resetStats && this._stats instanceof StatTimer) {
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this._stats = new StatTimer();
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}
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this.pendingCleanup = false;
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},
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/**
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* For internal use only.
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* @ignore
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*/
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_startRenderPage: function PDFPageProxy_startRenderPage(transparency,
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intent) {
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var intentState = this.intentStates[intent];
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// TODO Refactor RenderPageRequest to separate rendering
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// and operator list logic
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if (intentState.displayReadyCapability) {
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intentState.displayReadyCapability.resolve(transparency);
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}
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},
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/**
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* For internal use only.
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* @ignore
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*/
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_renderPageChunk: function PDFPageProxy_renderPageChunk(operatorListChunk,
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intent) {
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var intentState = this.intentStates[intent];
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var i, ii;
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// Add the new chunk to the current operator list.
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for (i = 0, ii = operatorListChunk.length; i < ii; i++) {
|
||||
intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);
|
||||
intentState.operatorList.argsArray.push(
|
||||
operatorListChunk.argsArray[i]);
|
||||
}
|
||||
intentState.operatorList.lastChunk = operatorListChunk.lastChunk;
|
||||
return renderTask;
|
||||
}
|
||||
|
||||
// Notify all the rendering tasks there are more operators to be consumed.
|
||||
for (i = 0; i < intentState.renderTasks.length; i++) {
|
||||
intentState.renderTasks[i].operatorListChanged();
|
||||
/**
|
||||
* @return {Promise} A promise resolved with an {@link PDFOperatorList}
|
||||
* object that represents page's operator list.
|
||||
*/
|
||||
getOperatorList() {
|
||||
function operatorListChanged() {
|
||||
if (intentState.operatorList.lastChunk) {
|
||||
intentState.opListReadCapability.resolve(intentState.operatorList);
|
||||
|
||||
const i = intentState.renderTasks.indexOf(opListTask);
|
||||
if (i >= 0) {
|
||||
intentState.renderTasks.splice(i, 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
const renderingIntent = 'oplist';
|
||||
if (!this.intentStates[renderingIntent]) {
|
||||
this.intentStates[renderingIntent] = Object.create(null);
|
||||
}
|
||||
const intentState = this.intentStates[renderingIntent];
|
||||
let opListTask;
|
||||
|
||||
if (!intentState.opListReadCapability) {
|
||||
opListTask = {};
|
||||
opListTask.operatorListChanged = operatorListChanged;
|
||||
intentState.receivingOperatorList = true;
|
||||
intentState.opListReadCapability = createPromiseCapability();
|
||||
intentState.renderTasks = [];
|
||||
intentState.renderTasks.push(opListTask);
|
||||
intentState.operatorList = {
|
||||
fnArray: [],
|
||||
argsArray: [],
|
||||
lastChunk: false,
|
||||
};
|
||||
|
||||
this._stats.time('Page Request');
|
||||
this._transport.messageHandler.send('RenderPageRequest', {
|
||||
pageIndex: this.pageIndex,
|
||||
intent: renderingIntent,
|
||||
});
|
||||
}
|
||||
return intentState.opListReadCapability.promise;
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {getTextContentParameters} params - getTextContent parameters.
|
||||
* @return {ReadableStream} ReadableStream to read textContent chunks.
|
||||
*/
|
||||
streamTextContent({ normalizeWhitespace = false,
|
||||
disableCombineTextItems = false, } = {}) {
|
||||
const TEXT_CONTENT_CHUNK_SIZE = 100;
|
||||
|
||||
return this._transport.messageHandler.sendWithStream('GetTextContent', {
|
||||
pageIndex: this.pageNumber - 1,
|
||||
normalizeWhitespace: normalizeWhitespace === true,
|
||||
combineTextItems: disableCombineTextItems !== true,
|
||||
}, {
|
||||
highWaterMark: TEXT_CONTENT_CHUNK_SIZE,
|
||||
size(textContent) {
|
||||
return textContent.items.length;
|
||||
},
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {getTextContentParameters} params - getTextContent parameters.
|
||||
* @return {Promise} That is resolved a {@link TextContent}
|
||||
* object that represent the page text content.
|
||||
*/
|
||||
getTextContent(params = {}) {
|
||||
const readableStream = this.streamTextContent(params);
|
||||
|
||||
return new Promise(function(resolve, reject) {
|
||||
function pump() {
|
||||
reader.read().then(function({ value, done, }) {
|
||||
if (done) {
|
||||
resolve(textContent);
|
||||
return;
|
||||
}
|
||||
Object.assign(textContent.styles, value.styles);
|
||||
textContent.items.push(...value.items);
|
||||
pump();
|
||||
}, reject);
|
||||
}
|
||||
|
||||
if (operatorListChunk.lastChunk) {
|
||||
intentState.receivingOperatorList = false;
|
||||
this._tryCleanup();
|
||||
}
|
||||
},
|
||||
const reader = readableStream.getReader();
|
||||
const textContent = {
|
||||
items: [],
|
||||
styles: Object.create(null),
|
||||
};
|
||||
pump();
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* @return {Object} Returns page stats, if enabled.
|
||||
*/
|
||||
get stats() {
|
||||
return (this._stats instanceof StatTimer ? this._stats : null);
|
||||
},
|
||||
};
|
||||
return PDFPageProxy;
|
||||
})();
|
||||
/**
|
||||
* Destroys page object.
|
||||
*/
|
||||
_destroy() {
|
||||
this.destroyed = true;
|
||||
this._transport.pageCache[this.pageIndex] = null;
|
||||
|
||||
const waitOn = [];
|
||||
Object.keys(this.intentStates).forEach(function(intent) {
|
||||
if (intent === 'oplist') {
|
||||
// Avoid errors below, since the renderTasks are just stubs.
|
||||
return;
|
||||
}
|
||||
const intentState = this.intentStates[intent];
|
||||
intentState.renderTasks.forEach(function(renderTask) {
|
||||
const renderCompleted = renderTask.capability.promise.
|
||||
catch(function() {}); // ignoring failures
|
||||
waitOn.push(renderCompleted);
|
||||
renderTask.cancel();
|
||||
});
|
||||
}, this);
|
||||
this.objs.clear();
|
||||
this.annotationsPromise = null;
|
||||
this.pendingCleanup = false;
|
||||
return Promise.all(waitOn);
|
||||
}
|
||||
|
||||
/**
|
||||
* Cleans up resources allocated by the page.
|
||||
* @param {boolean} resetStats - (optional) Reset page stats, if enabled.
|
||||
* The default value is `false`.
|
||||
*/
|
||||
cleanup(resetStats = false) {
|
||||
this.pendingCleanup = true;
|
||||
this._tryCleanup(resetStats);
|
||||
}
|
||||
|
||||
/**
|
||||
* For internal use only. Attempts to clean up if rendering is in a state
|
||||
* where that's possible.
|
||||
* @ignore
|
||||
*/
|
||||
_tryCleanup(resetStats = false) {
|
||||
if (!this.pendingCleanup ||
|
||||
Object.keys(this.intentStates).some(function(intent) {
|
||||
const intentState = this.intentStates[intent];
|
||||
return (intentState.renderTasks.length !== 0 ||
|
||||
intentState.receivingOperatorList);
|
||||
}, this)) {
|
||||
return;
|
||||
}
|
||||
|
||||
Object.keys(this.intentStates).forEach(function(intent) {
|
||||
delete this.intentStates[intent];
|
||||
}, this);
|
||||
this.objs.clear();
|
||||
this.annotationsPromise = null;
|
||||
if (resetStats && this._stats instanceof StatTimer) {
|
||||
this._stats = new StatTimer();
|
||||
}
|
||||
this.pendingCleanup = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* For internal use only.
|
||||
* @ignore
|
||||
*/
|
||||
_startRenderPage(transparency, intent) {
|
||||
const intentState = this.intentStates[intent];
|
||||
// TODO Refactor RenderPageRequest to separate rendering
|
||||
// and operator list logic
|
||||
if (intentState.displayReadyCapability) {
|
||||
intentState.displayReadyCapability.resolve(transparency);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* For internal use only.
|
||||
* @ignore
|
||||
*/
|
||||
_renderPageChunk(operatorListChunk, intent) {
|
||||
const intentState = this.intentStates[intent];
|
||||
// Add the new chunk to the current operator list.
|
||||
for (let i = 0, ii = operatorListChunk.length; i < ii; i++) {
|
||||
intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);
|
||||
intentState.operatorList.argsArray.push(
|
||||
operatorListChunk.argsArray[i]);
|
||||
}
|
||||
intentState.operatorList.lastChunk = operatorListChunk.lastChunk;
|
||||
|
||||
// Notify all the rendering tasks there are more operators to be consumed.
|
||||
for (let i = 0; i < intentState.renderTasks.length; i++) {
|
||||
intentState.renderTasks[i].operatorListChanged();
|
||||
}
|
||||
|
||||
if (operatorListChunk.lastChunk) {
|
||||
intentState.receivingOperatorList = false;
|
||||
this._tryCleanup();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @return {Object} Returns page stats, if enabled.
|
||||
*/
|
||||
get stats() {
|
||||
return (this._stats instanceof StatTimer ? this._stats : null);
|
||||
}
|
||||
}
|
||||
|
||||
class LoopbackPort {
|
||||
constructor(defer = true) {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user