mirror of
https://github.com/zen-browser/pdf.js.git
synced 2025-07-08 01:10:08 +02:00
784 lines
21 KiB
JavaScript
784 lines
21 KiB
JavaScript
/* Copyright 2022 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { AnnotationEditorType, shadow } from "../../shared/util.js";
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import { AnnotationEditor } from "./editor.js";
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import { PixelsPerInch } from "../display_utils.js";
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import { StampAnnotationElement } from "../annotation_layer.js";
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/**
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* Basic text editor in order to create a FreeTex annotation.
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*/
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class StampEditor extends AnnotationEditor {
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#bitmap = null;
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#bitmapId = null;
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#bitmapPromise = null;
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#bitmapUrl = null;
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#bitmapFile = null;
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#bitmapFileName = "";
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#canvas = null;
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#observer = null;
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#resizeTimeoutId = null;
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#isSvg = false;
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#hasBeenAddedInUndoStack = false;
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static _type = "stamp";
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static _editorType = AnnotationEditorType.STAMP;
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constructor(params) {
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super({ ...params, name: "stampEditor" });
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this.#bitmapUrl = params.bitmapUrl;
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this.#bitmapFile = params.bitmapFile;
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}
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/** @inheritdoc */
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static initialize(l10n, uiManager) {
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AnnotationEditor.initialize(l10n, uiManager);
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}
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static get supportedTypes() {
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// See https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Image_types
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// to know which types are supported by the browser.
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const types = [
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"apng",
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"avif",
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"bmp",
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"gif",
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"jpeg",
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"png",
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"svg+xml",
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"webp",
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"x-icon",
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];
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return shadow(
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this,
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"supportedTypes",
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types.map(type => `image/${type}`)
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);
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}
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static get supportedTypesStr() {
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return shadow(this, "supportedTypesStr", this.supportedTypes.join(","));
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}
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/** @inheritdoc */
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static isHandlingMimeForPasting(mime) {
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return this.supportedTypes.includes(mime);
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}
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/** @inheritdoc */
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static paste(item, parent) {
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parent.pasteEditor(AnnotationEditorType.STAMP, {
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bitmapFile: item.getAsFile(),
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});
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}
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/** @inheritdoc */
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altTextFinish() {
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if (this._uiManager.useNewAltTextFlow) {
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this.div.hidden = false;
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}
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super.altTextFinish();
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}
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#getBitmapFetched(data, fromId = false) {
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if (!data) {
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this.remove();
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return;
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}
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this.#bitmap = data.bitmap;
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if (!fromId) {
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this.#bitmapId = data.id;
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this.#isSvg = data.isSvg;
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}
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if (data.file) {
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this.#bitmapFileName = data.file.name;
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}
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this.#createCanvas();
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}
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#getBitmapDone() {
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this.#bitmapPromise = null;
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this._uiManager.enableWaiting(false);
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if (!this.#canvas) {
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return;
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}
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if (
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this._uiManager.useNewAltTextWhenAddingImage &&
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this._uiManager.useNewAltTextFlow &&
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this.#bitmap
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) {
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this._editToolbar.hide();
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this._uiManager.editAltText(this, /* firstTime = */ true);
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return;
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}
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if (
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!this._uiManager.useNewAltTextWhenAddingImage &&
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this._uiManager.useNewAltTextFlow &&
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this.#bitmap
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) {
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try {
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// The alt-text dialog isn't opened but we still want to guess the alt
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// text.
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this.mlGuessAltText();
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} catch {}
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}
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this.div.focus();
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}
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async mlGuessAltText(imageData = null, updateAltTextData = true) {
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if (this.hasAltTextData()) {
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return null;
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}
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const { mlManager } = this._uiManager;
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if (!mlManager) {
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throw new Error("No ML.");
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}
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if (!(await mlManager.isEnabledFor("altText"))) {
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throw new Error("ML isn't enabled for alt text.");
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}
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const { data, width, height } =
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imageData ||
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this.copyCanvas(null, /* createImageData = */ true).imageData;
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const response = await mlManager.guess({
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name: "altText",
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request: {
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data,
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width,
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height,
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channels: data.length / (width * height),
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},
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});
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if (!response) {
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throw new Error("No response from the AI service.");
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}
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if (response.error) {
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throw new Error("Error from the AI service.");
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}
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if (response.cancel) {
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return null;
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}
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if (!response.output) {
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throw new Error("No valid response from the AI service.");
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}
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const altText = response.output;
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await this.setGuessedAltText(altText);
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if (updateAltTextData && !this.hasAltTextData()) {
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this.altTextData = { alt: altText, decorative: false };
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}
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return altText;
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}
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#getBitmap() {
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if (this.#bitmapId) {
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this._uiManager.enableWaiting(true);
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this._uiManager.imageManager
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.getFromId(this.#bitmapId)
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.then(data => this.#getBitmapFetched(data, /* fromId = */ true))
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.finally(() => this.#getBitmapDone());
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return;
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}
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if (this.#bitmapUrl) {
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const url = this.#bitmapUrl;
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this.#bitmapUrl = null;
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this._uiManager.enableWaiting(true);
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this.#bitmapPromise = this._uiManager.imageManager
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.getFromUrl(url)
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.then(data => this.#getBitmapFetched(data))
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.finally(() => this.#getBitmapDone());
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return;
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}
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if (this.#bitmapFile) {
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const file = this.#bitmapFile;
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this.#bitmapFile = null;
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this._uiManager.enableWaiting(true);
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this.#bitmapPromise = this._uiManager.imageManager
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.getFromFile(file)
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.then(data => this.#getBitmapFetched(data))
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.finally(() => this.#getBitmapDone());
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return;
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}
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const input = document.createElement("input");
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
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input.hidden = true;
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input.id = "stampEditorFileInput";
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document.body.append(input);
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}
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input.type = "file";
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input.accept = StampEditor.supportedTypesStr;
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const signal = this._uiManager._signal;
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this.#bitmapPromise = new Promise(resolve => {
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input.addEventListener(
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"change",
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async () => {
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if (!input.files || input.files.length === 0) {
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this.remove();
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} else {
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this._uiManager.enableWaiting(true);
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const data = await this._uiManager.imageManager.getFromFile(
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input.files[0]
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);
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this.#getBitmapFetched(data);
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}
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
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input.remove();
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}
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resolve();
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},
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{ signal }
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);
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input.addEventListener(
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"cancel",
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() => {
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this.remove();
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resolve();
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},
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{ signal }
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);
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}).finally(() => this.#getBitmapDone());
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if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("TESTING")) {
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input.click();
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}
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}
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/** @inheritdoc */
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remove() {
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if (this.#bitmapId) {
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this.#bitmap = null;
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this._uiManager.imageManager.deleteId(this.#bitmapId);
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this.#canvas?.remove();
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this.#canvas = null;
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this.#observer?.disconnect();
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this.#observer = null;
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if (this.#resizeTimeoutId) {
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clearTimeout(this.#resizeTimeoutId);
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this.#resizeTimeoutId = null;
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}
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}
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super.remove();
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}
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/** @inheritdoc */
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rebuild() {
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if (!this.parent) {
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// It's possible to have to rebuild an editor which is not on a visible
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// page.
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if (this.#bitmapId) {
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this.#getBitmap();
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}
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return;
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}
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super.rebuild();
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if (this.div === null) {
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return;
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}
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if (this.#bitmapId && this.#canvas === null) {
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this.#getBitmap();
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}
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if (!this.isAttachedToDOM) {
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// At some point this editor was removed and we're rebuilting it,
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// hence we must add it to its parent.
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this.parent.add(this);
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}
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}
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/** @inheritdoc */
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onceAdded() {
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this._isDraggable = true;
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this.div.focus();
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}
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/** @inheritdoc */
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isEmpty() {
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return !(
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this.#bitmapPromise ||
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this.#bitmap ||
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this.#bitmapUrl ||
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this.#bitmapFile ||
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this.#bitmapId
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);
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}
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/** @inheritdoc */
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get isResizable() {
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return true;
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}
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/** @inheritdoc */
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render() {
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if (this.div) {
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return this.div;
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}
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let baseX, baseY;
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if (this.width) {
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baseX = this.x;
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baseY = this.y;
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}
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super.render();
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this.div.hidden = true;
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this.addAltTextButton();
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if (this.#bitmap) {
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this.#createCanvas();
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} else {
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this.#getBitmap();
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}
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if (this.width) {
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// This editor was created in using copy (ctrl+c).
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const [parentWidth, parentHeight] = this.parentDimensions;
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this.setAt(
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baseX * parentWidth,
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baseY * parentHeight,
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this.width * parentWidth,
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this.height * parentHeight
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);
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}
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return this.div;
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}
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#createCanvas() {
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const { div } = this;
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let { width, height } = this.#bitmap;
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const [pageWidth, pageHeight] = this.pageDimensions;
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const MAX_RATIO = 0.75;
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if (this.width) {
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width = this.width * pageWidth;
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height = this.height * pageHeight;
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} else if (
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width > MAX_RATIO * pageWidth ||
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height > MAX_RATIO * pageHeight
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) {
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// If the the image is too big compared to the page dimensions
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// (more than MAX_RATIO) then we scale it down.
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const factor = Math.min(
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(MAX_RATIO * pageWidth) / width,
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(MAX_RATIO * pageHeight) / height
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);
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width *= factor;
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height *= factor;
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}
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const [parentWidth, parentHeight] = this.parentDimensions;
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this.setDims(
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(width * parentWidth) / pageWidth,
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(height * parentHeight) / pageHeight
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);
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this._uiManager.enableWaiting(false);
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const canvas = (this.#canvas = document.createElement("canvas"));
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div.append(canvas);
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if (
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!this._uiManager.useNewAltTextWhenAddingImage ||
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!this._uiManager.useNewAltTextFlow
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) {
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div.hidden = false;
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}
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this.#drawBitmap(width, height);
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this.#createObserver();
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if (!this.#hasBeenAddedInUndoStack) {
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this.parent.addUndoableEditor(this);
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this.#hasBeenAddedInUndoStack = true;
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}
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// There are multiple ways to add an image to the page, so here we just
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// count the number of times an image is added to the page whatever the way
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// is.
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this._reportTelemetry({
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action: "inserted_image",
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});
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if (this.#bitmapFileName) {
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canvas.setAttribute("aria-label", this.#bitmapFileName);
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}
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}
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copyCanvas(maxDimension, createImageData = false) {
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if (!maxDimension) {
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// TODO: get this value from Firefox
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// (https://bugzilla.mozilla.org/show_bug.cgi?id=1908184)
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// It's the maximum dimension that the AI can handle.
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maxDimension = 224;
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}
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const { width: bitmapWidth, height: bitmapHeight } = this.#bitmap;
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const canvas = document.createElement("canvas");
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let bitmap = this.#bitmap;
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let width = bitmapWidth,
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height = bitmapHeight;
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if (bitmapWidth > maxDimension || bitmapHeight > maxDimension) {
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const ratio = Math.min(
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maxDimension / bitmapWidth,
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maxDimension / bitmapHeight
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);
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width = Math.floor(bitmapWidth * ratio);
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height = Math.floor(bitmapHeight * ratio);
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if (!this.#isSvg) {
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bitmap = this.#scaleBitmap(width, height);
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}
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}
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canvas.width = width;
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canvas.height = height;
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const ctx = canvas.getContext("2d");
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ctx.filter = this._uiManager.hcmFilter;
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// Add a checkerboard pattern as a background in case the image has some
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// transparency.
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let white = "white",
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black = "#cfcfd8";
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if (this._uiManager.hcmFilter !== "none") {
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black = "black";
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} else if (window.matchMedia?.("(prefers-color-scheme: dark)").matches) {
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white = "#8f8f9d";
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black = "#42414d";
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}
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const boxDim = 15;
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const pattern = new OffscreenCanvas(boxDim * 2, boxDim * 2);
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const patternCtx = pattern.getContext("2d");
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patternCtx.fillStyle = white;
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patternCtx.fillRect(0, 0, boxDim * 2, boxDim * 2);
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patternCtx.fillStyle = black;
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patternCtx.fillRect(0, 0, boxDim, boxDim);
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patternCtx.fillRect(boxDim, boxDim, boxDim, boxDim);
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ctx.fillStyle = ctx.createPattern(pattern, "repeat");
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ctx.fillRect(0, 0, width, height);
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if (createImageData) {
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const offscreen = new OffscreenCanvas(width, height);
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const offscreenCtx = offscreen.getContext("2d", {
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willReadFrequently: true,
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});
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offscreenCtx.drawImage(
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bitmap,
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0,
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0,
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bitmap.width,
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bitmap.height,
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0,
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0,
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width,
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height
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);
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const data = offscreenCtx.getImageData(0, 0, width, height).data;
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ctx.drawImage(offscreen, 0, 0);
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return { canvas, imageData: { width, height, data } };
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}
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ctx.drawImage(
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bitmap,
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0,
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0,
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bitmap.width,
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bitmap.height,
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0,
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0,
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width,
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height
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);
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return { canvas, imageData: null };
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}
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|
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/**
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* When the dimensions of the div change the inner canvas must
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* renew its dimensions, hence it must redraw its own contents.
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* @param {number} width - the new width of the div
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* @param {number} height - the new height of the div
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* @returns
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*/
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#setDimensions(width, height) {
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const [parentWidth, parentHeight] = this.parentDimensions;
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this.width = width / parentWidth;
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this.height = height / parentHeight;
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this.setDims(width, height);
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if (this._initialOptions?.isCentered) {
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this.center();
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} else {
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this.fixAndSetPosition();
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}
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this._initialOptions = null;
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if (this.#resizeTimeoutId !== null) {
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clearTimeout(this.#resizeTimeoutId);
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}
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// When the user is resizing the editor we just use CSS to scale the image
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// to avoid redrawing it too often.
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// And once the user stops resizing the editor we redraw the image in
|
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// rescaling it correctly (see this.#scaleBitmap).
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const TIME_TO_WAIT = 200;
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this.#resizeTimeoutId = setTimeout(() => {
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this.#resizeTimeoutId = null;
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this.#drawBitmap(width, height);
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}, TIME_TO_WAIT);
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}
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|
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#scaleBitmap(width, height) {
|
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const { width: bitmapWidth, height: bitmapHeight } = this.#bitmap;
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let newWidth = bitmapWidth;
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let newHeight = bitmapHeight;
|
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let bitmap = this.#bitmap;
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while (newWidth > 2 * width || newHeight > 2 * height) {
|
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const prevWidth = newWidth;
|
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const prevHeight = newHeight;
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|
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if (newWidth > 2 * width) {
|
|
// See bug 1820511 (Windows specific bug).
|
|
// TODO: once the above bug is fixed we could revert to:
|
|
// newWidth = Math.ceil(newWidth / 2);
|
|
newWidth =
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newWidth >= 16384
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? Math.floor(newWidth / 2) - 1
|
|
: Math.ceil(newWidth / 2);
|
|
}
|
|
if (newHeight > 2 * height) {
|
|
newHeight =
|
|
newHeight >= 16384
|
|
? Math.floor(newHeight / 2) - 1
|
|
: Math.ceil(newHeight / 2);
|
|
}
|
|
|
|
const offscreen = new OffscreenCanvas(newWidth, newHeight);
|
|
const ctx = offscreen.getContext("2d");
|
|
ctx.drawImage(
|
|
bitmap,
|
|
0,
|
|
0,
|
|
prevWidth,
|
|
prevHeight,
|
|
0,
|
|
0,
|
|
newWidth,
|
|
newHeight
|
|
);
|
|
bitmap = offscreen.transferToImageBitmap();
|
|
}
|
|
|
|
return bitmap;
|
|
}
|
|
|
|
#drawBitmap(width, height) {
|
|
width = Math.ceil(width);
|
|
height = Math.ceil(height);
|
|
const canvas = this.#canvas;
|
|
if (!canvas || (canvas.width === width && canvas.height === height)) {
|
|
return;
|
|
}
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
const bitmap = this.#isSvg
|
|
? this.#bitmap
|
|
: this.#scaleBitmap(width, height);
|
|
|
|
const ctx = canvas.getContext("2d");
|
|
ctx.filter = this._uiManager.hcmFilter;
|
|
ctx.drawImage(
|
|
bitmap,
|
|
0,
|
|
0,
|
|
bitmap.width,
|
|
bitmap.height,
|
|
0,
|
|
0,
|
|
width,
|
|
height
|
|
);
|
|
}
|
|
|
|
/** @inheritdoc */
|
|
getImageForAltText() {
|
|
return this.#canvas;
|
|
}
|
|
|
|
#serializeBitmap(toUrl) {
|
|
if (toUrl) {
|
|
if (this.#isSvg) {
|
|
const url = this._uiManager.imageManager.getSvgUrl(this.#bitmapId);
|
|
if (url) {
|
|
return url;
|
|
}
|
|
}
|
|
// We convert to a data url because it's sync and the url can live in the
|
|
// clipboard.
|
|
const canvas = document.createElement("canvas");
|
|
({ width: canvas.width, height: canvas.height } = this.#bitmap);
|
|
const ctx = canvas.getContext("2d");
|
|
ctx.drawImage(this.#bitmap, 0, 0);
|
|
|
|
return canvas.toDataURL();
|
|
}
|
|
|
|
if (this.#isSvg) {
|
|
const [pageWidth, pageHeight] = this.pageDimensions;
|
|
// Multiply by PixelsPerInch.PDF_TO_CSS_UNITS in order to increase the
|
|
// image resolution when rasterizing it.
|
|
const width = Math.round(
|
|
this.width * pageWidth * PixelsPerInch.PDF_TO_CSS_UNITS
|
|
);
|
|
const height = Math.round(
|
|
this.height * pageHeight * PixelsPerInch.PDF_TO_CSS_UNITS
|
|
);
|
|
const offscreen = new OffscreenCanvas(width, height);
|
|
const ctx = offscreen.getContext("2d");
|
|
ctx.drawImage(
|
|
this.#bitmap,
|
|
0,
|
|
0,
|
|
this.#bitmap.width,
|
|
this.#bitmap.height,
|
|
0,
|
|
0,
|
|
width,
|
|
height
|
|
);
|
|
return offscreen.transferToImageBitmap();
|
|
}
|
|
|
|
return structuredClone(this.#bitmap);
|
|
}
|
|
|
|
/**
|
|
* Create the resize observer.
|
|
*/
|
|
#createObserver() {
|
|
if (!this._uiManager._signal) {
|
|
// This method is called after the canvas has been created but the canvas
|
|
// creation is async, so it's possible that the viewer has been closed.
|
|
return;
|
|
}
|
|
this.#observer = new ResizeObserver(entries => {
|
|
const rect = entries[0].contentRect;
|
|
if (rect.width && rect.height) {
|
|
this.#setDimensions(rect.width, rect.height);
|
|
}
|
|
});
|
|
this.#observer.observe(this.div);
|
|
this._uiManager._signal.addEventListener(
|
|
"abort",
|
|
() => {
|
|
this.#observer?.disconnect();
|
|
this.#observer = null;
|
|
},
|
|
{ once: true }
|
|
);
|
|
}
|
|
|
|
/** @inheritdoc */
|
|
static deserialize(data, parent, uiManager) {
|
|
if (data instanceof StampAnnotationElement) {
|
|
return null;
|
|
}
|
|
const editor = super.deserialize(data, parent, uiManager);
|
|
const { rect, bitmapUrl, bitmapId, isSvg, accessibilityData } = data;
|
|
if (bitmapId && uiManager.imageManager.isValidId(bitmapId)) {
|
|
editor.#bitmapId = bitmapId;
|
|
} else {
|
|
editor.#bitmapUrl = bitmapUrl;
|
|
}
|
|
editor.#isSvg = isSvg;
|
|
|
|
const [parentWidth, parentHeight] = editor.pageDimensions;
|
|
editor.width = (rect[2] - rect[0]) / parentWidth;
|
|
editor.height = (rect[3] - rect[1]) / parentHeight;
|
|
|
|
if (accessibilityData) {
|
|
editor.altTextData = accessibilityData;
|
|
}
|
|
|
|
return editor;
|
|
}
|
|
|
|
/** @inheritdoc */
|
|
serialize(isForCopying = false, context = null) {
|
|
if (this.isEmpty()) {
|
|
return null;
|
|
}
|
|
|
|
const serialized = {
|
|
annotationType: AnnotationEditorType.STAMP,
|
|
bitmapId: this.#bitmapId,
|
|
pageIndex: this.pageIndex,
|
|
rect: this.getRect(0, 0),
|
|
rotation: this.rotation,
|
|
isSvg: this.#isSvg,
|
|
structTreeParentId: this._structTreeParentId,
|
|
};
|
|
|
|
if (isForCopying) {
|
|
// We don't know what's the final destination (this pdf or another one)
|
|
// of this annotation and the clipboard doesn't support ImageBitmaps,
|
|
// hence we serialize the bitmap to a data url.
|
|
serialized.bitmapUrl = this.#serializeBitmap(/* toUrl = */ true);
|
|
serialized.accessibilityData = this.serializeAltText(true);
|
|
return serialized;
|
|
}
|
|
|
|
const { decorative, altText } = this.serializeAltText(false);
|
|
if (!decorative && altText) {
|
|
serialized.accessibilityData = { type: "Figure", alt: altText };
|
|
}
|
|
|
|
if (context === null) {
|
|
return serialized;
|
|
}
|
|
|
|
context.stamps ||= new Map();
|
|
const area = this.#isSvg
|
|
? (serialized.rect[2] - serialized.rect[0]) *
|
|
(serialized.rect[3] - serialized.rect[1])
|
|
: null;
|
|
if (!context.stamps.has(this.#bitmapId)) {
|
|
// We don't want to have multiple copies of the same bitmap in the
|
|
// annotationMap, hence we only add the bitmap the first time we meet it.
|
|
context.stamps.set(this.#bitmapId, { area, serialized });
|
|
serialized.bitmap = this.#serializeBitmap(/* toUrl = */ false);
|
|
} else if (this.#isSvg) {
|
|
// If we have multiple copies of the same svg but with different sizes,
|
|
// then we want to keep the biggest one.
|
|
const prevData = context.stamps.get(this.#bitmapId);
|
|
if (area > prevData.area) {
|
|
prevData.area = area;
|
|
prevData.serialized.bitmap.close();
|
|
prevData.serialized.bitmap = this.#serializeBitmap(/* toUrl = */ false);
|
|
}
|
|
}
|
|
return serialized;
|
|
}
|
|
}
|
|
|
|
export { StampEditor };
|