pdf.js.mirror/web/app_options.js
Nicolò Ribaudo 886c90d1a5
Add support for right-clicking on images
This patch adds right-click support for images in the PDF, allowing
users to download them. To minimize memory consumption, we:
- Do not store the images separately, and instead crop them out of the
  PDF page canvas
- Only extract the images when needed (i.e. when the user right-clicks
  on them), rather than eagery having all of them available.

To do so, we layer one empty 0x0 canvas per image, stretched to cover
the whole image, and only populate its contents on right click.
These images need to be inside the text layer: they cannot be _behind_
it, otherwise they would be covered by the text layer's container and
not be clickable, and they cannot be in front of it, otherwise they
would make the text spans unselectable.

This feature is managed by a new preference, `imagesRightClickMinSize`:
- when it's set to `-1`, right-click support is disabled
- when set to `0`, all images are available for right click
- when set to a positive integer, only images whose width and height are
  greater than or equal to that value (in the PDF page frame of
  reference) are available for right click.

This features is disabled by default outside of MOZCENTRAL, as it
significantly degrades the text selection experience in non-Firefox
browsers.
2026-03-10 14:51:03 +01:00

747 lines
20 KiB
JavaScript

/* Copyright 2018 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.
*/
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
// eslint-disable-next-line no-var
var compatParams = new Map();
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("LIB") &&
!globalThis.navigator?.language
) {
globalThis.navigator = {
language: "en-US",
maxTouchPoints: 1,
platform: "",
userAgent: "",
};
}
const { maxTouchPoints, platform, userAgent } = navigator;
const isAndroid = /Android/.test(userAgent);
const isIOS =
/\b(iPad|iPhone|iPod)(?=;)/.test(userAgent) ||
(platform === "MacIntel" && maxTouchPoints > 1);
// Limit canvas size to 5 mega-pixels on mobile.
// Support: Android, iOS
if (isIOS || isAndroid) {
compatParams.set("maxCanvasPixels", 5242880);
}
// Don't use system fonts on Android (issue 18210).
// Support: Android
if (isAndroid) {
compatParams.set("useSystemFonts", false);
}
}
const OptionKind = {
BROWSER: 0x01,
VIEWER: 0x02,
API: 0x04,
WORKER: 0x08,
EVENT_DISPATCH: 0x10,
PREFERENCE: 0x80,
};
// Should only be used with options that allow multiple types.
const Type = {
BOOLEAN: 0x01,
NUMBER: 0x02,
OBJECT: 0x04,
STRING: 0x08,
UNDEFINED: 0x10,
};
/**
* NOTE: These options are used to generate the `default_preferences.json` file,
* see `OptionKind.PREFERENCE`, hence the values below must use only
* primitive types and cannot rely on any imported types.
*/
const defaultOptions = {
allowedGlobalEvents: {
/** @type {Object} */
value: null,
kind: OptionKind.BROWSER,
},
canvasMaxAreaInBytes: {
/** @type {number} */
value: -1,
kind: OptionKind.BROWSER + OptionKind.API,
},
isInAutomation: {
/** @type {boolean} */
value: false,
kind: OptionKind.BROWSER,
},
localeProperties: {
/** @type {Object} */
value:
typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")
? { lang: navigator.language || "en-US" }
: null,
kind: OptionKind.BROWSER,
},
maxCanvasDim: {
/** @type {number} */
value: 32767,
kind: OptionKind.BROWSER + OptionKind.VIEWER,
},
nimbusDataStr: {
/** @type {string} */
value: "",
kind: OptionKind.BROWSER,
},
supportsCaretBrowsingMode: {
/** @type {boolean} */
value: false,
kind: OptionKind.BROWSER,
},
supportsDocumentFonts: {
/** @type {boolean} */
value: true,
kind: OptionKind.BROWSER,
},
supportsIntegratedFind: {
/** @type {boolean} */
value: false,
kind: OptionKind.BROWSER,
},
supportsMouseWheelZoomCtrlKey: {
/** @type {boolean} */
value: true,
kind: OptionKind.BROWSER,
},
supportsMouseWheelZoomMetaKey: {
/** @type {boolean} */
value: true,
kind: OptionKind.BROWSER,
},
supportsPinchToZoom: {
/** @type {boolean} */
value: true,
kind: OptionKind.BROWSER,
},
supportsPrinting: {
/** @type {boolean} */
value: true,
kind: OptionKind.BROWSER,
},
toolbarDensity: {
/** @type {number} */
value: 0, // 0 = "normal", 1 = "compact", 2 = "touch"
kind: OptionKind.BROWSER + OptionKind.EVENT_DISPATCH,
},
altTextLearnMoreUrl: {
/** @type {string} */
value:
typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
? "https://support.mozilla.org/1/firefox/%VERSION%/%OS%/%LOCALE%/pdf-alt-text"
: "",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
annotationEditorMode: {
/** @type {number} */
value: 0,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
annotationMode: {
/** @type {number} */
value: 2,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
capCanvasAreaFactor: {
/** @type {number} */
value: 200,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
commentLearnMoreUrl: {
/** @type {string} */
value:
typeof PDFJSDev === "undefined" || PDFJSDev.test("MOZCENTRAL")
? "https://support.mozilla.org/%LOCALE%/kb/view-pdf-files-firefox-or-choose-another-viewer#w_add-a-comment-to-a-pdf"
: "",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
cursorToolOnLoad: {
/** @type {number} */
value: 0,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
debuggerSrc: {
/** @type {string} */
value: "./debugger.mjs",
kind: OptionKind.VIEWER,
},
defaultZoomDelay: {
/** @type {number} */
value: 400,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
defaultZoomValue: {
/** @type {string} */
value: "",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
disableHistory: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER,
},
disablePageLabels: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableAltText: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableAltTextModelDownload: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE + OptionKind.EVENT_DISPATCH,
},
enableAutoLinking: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableComment: {
/** @type {boolean} */
value: typeof PDFJSDev === "undefined",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableDetailCanvas: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER,
},
enableGuessAltText: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE + OptionKind.EVENT_DISPATCH,
},
enableHighlightFloatingButton: {
// We'll probably want to make some experiments before enabling this
// in Firefox release, but it has to be temporary.
// TODO: remove it when unnecessary.
/** @type {boolean} */
value: typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING"),
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableNewAltTextWhenAddingImage: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableOptimizedPartialRendering: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enablePermissions: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enablePrintAutoRotate: {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableScripting: {
/** @type {boolean} */
value: typeof PDFJSDev === "undefined" || !PDFJSDev.test("CHROME"),
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableSignatureEditor: {
/** @type {boolean} */
value: typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING"),
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableSplitMerge: {
/** @type {boolean} */
value: typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING"),
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableUpdatedAddImage: {
// We'll probably want to make some experiments before enabling this
// in Firefox release, but it has to be temporary.
// TODO: remove it when unnecessary.
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
externalLinkRel: {
/** @type {string} */
value: "noopener noreferrer nofollow",
kind: OptionKind.VIEWER,
},
externalLinkTarget: {
/** @type {number} */
value: 0,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
highlightEditorColors: {
/** @type {string} */
value:
"yellow=#FFFF98,green=#53FFBC,blue=#80EBFF,pink=#FFCBE6,red=#FF4F5F," +
"yellow_HCM=#FFFFCC,green_HCM=#53FFBC,blue_HCM=#80EBFF,pink_HCM=#F6B8FF,red_HCM=#C50043",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
historyUpdateUrl: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
ignoreDestinationZoom: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
imageResourcesPath: {
/** @type {string} */
value:
typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/web/images/"
: "./images/",
kind: OptionKind.VIEWER,
},
imagesRightClickMinSize: {
/** @type {number} */
value:
typeof PDFJSDev !== "undefined" &&
// Firefox mobile does not support right-clicking on images,
// see https://bugzilla.mozilla.org/show_bug.cgi?id=2014081.
// This option is disabled by default outside of MOZCENTRAL
// because it degrades the text selection experience in Chrome
// and Safari.
PDFJSDev.test("MOZCENTRAL && !GECKOVIEW")
? 16
: -1,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
maxCanvasPixels: {
/** @type {number} */
value: 2 ** 25,
kind: OptionKind.VIEWER,
},
minDurationToUpdateCanvas: {
/** @type {number} */
value: 500, // ms
kind: OptionKind.VIEWER,
},
forcePageColors: {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
pageColorsBackground: {
/** @type {string} */
value: "Canvas",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
pageColorsForeground: {
/** @type {string} */
value: "CanvasText",
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
pdfBugEnabled: {
/** @type {boolean} */
value: typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING"),
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
printResolution: {
/** @type {number} */
value: 150,
kind: OptionKind.VIEWER,
},
sidebarViewOnLoad: {
/** @type {number} */
value: -1,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
scrollModeOnLoad: {
/** @type {number} */
value: -1,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
spreadModeOnLoad: {
/** @type {number} */
value: -1,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
textLayerMode: {
/** @type {number} */
value: 1,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
viewerCssTheme: {
/** @type {number} */
value: typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME") ? 2 : 0,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
viewOnLoad: {
/** @type {boolean} */
value: 0,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
},
cMapPacked: {
/** @type {boolean} */
value: true,
kind: OptionKind.API,
},
cMapUrl: {
/** @type {string} */
value:
// eslint-disable-next-line no-nested-ternary
typeof PDFJSDev === "undefined"
? "../external/bcmaps/"
: PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/web/cmaps/"
: "../web/cmaps/",
kind: OptionKind.API,
},
disableAutoFetch: {
/** @type {boolean} */
value: false,
kind: OptionKind.API + OptionKind.PREFERENCE,
},
disableFontFace: {
/** @type {boolean} */
value: false,
kind: OptionKind.API + OptionKind.PREFERENCE,
},
disableRange: {
/** @type {boolean} */
value: false,
kind: OptionKind.API + OptionKind.PREFERENCE,
},
disableStream: {
/** @type {boolean} */
value: false,
kind: OptionKind.API + OptionKind.PREFERENCE,
},
docBaseUrl: {
/** @type {string} */
value:
typeof PDFJSDev === "undefined"
? // NOTE: We cannot use the `updateUrlHash` function here, because of
// the default preferences generation (see `gulpfile.mjs`).
// However, the following line is *only* used in development mode.
document.URL.split("#", 1)[0]
: "",
kind: OptionKind.API,
},
enableHWA: {
/** @type {boolean} */
value: typeof PDFJSDev !== "undefined" && !PDFJSDev.test("MOZCENTRAL"),
kind: OptionKind.API + OptionKind.VIEWER + OptionKind.PREFERENCE,
},
enableXfa: {
/** @type {boolean} */
value: true,
kind: OptionKind.API + OptionKind.PREFERENCE,
},
fontExtraProperties: {
/** @type {boolean} */
value: false,
kind: OptionKind.API,
},
iccUrl: {
/** @type {string} */
value:
// eslint-disable-next-line no-nested-ternary
typeof PDFJSDev === "undefined"
? "../external/iccs/"
: PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/web/iccs/"
: "../web/iccs/",
kind: OptionKind.API,
},
isEvalSupported: {
/** @type {boolean} */
value: true,
kind: OptionKind.API,
},
isOffscreenCanvasSupported: {
/** @type {boolean} */
value: true,
kind: OptionKind.API,
},
maxImageSize: {
/** @type {number} */
value: -1,
kind: OptionKind.API,
},
pdfBug: {
/** @type {boolean} */
value: false,
kind: OptionKind.API,
},
standardFontDataUrl: {
/** @type {string} */
value:
// eslint-disable-next-line no-nested-ternary
typeof PDFJSDev === "undefined"
? "../external/standard_fonts/"
: PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/web/standard_fonts/"
: "../web/standard_fonts/",
kind: OptionKind.API,
},
useSystemFonts: {
// On Android, there is almost no chance to have the font we want so we
// don't use the system fonts in this case (bug 1882613).
/** @type {boolean|undefined} */
value: (
typeof PDFJSDev === "undefined"
? window.isGECKOVIEW
: PDFJSDev.test("GECKOVIEW")
)
? false
: undefined,
kind: OptionKind.API,
type: Type.BOOLEAN + Type.UNDEFINED,
},
verbosity: {
/** @type {number} */
value: 1,
kind: OptionKind.API,
},
wasmUrl: {
/** @type {string} */
value:
typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/web/wasm/"
: "../web/wasm/",
kind: OptionKind.API,
},
workerPort: {
/** @type {Object} */
value:
typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
? globalThis.pdfjsPreloadedWorker || null
: null,
kind: OptionKind.WORKER,
},
workerSrc: {
/** @type {string} */
value:
// eslint-disable-next-line no-nested-ternary
typeof PDFJSDev === "undefined"
? "../src/pdf.worker.js"
: PDFJSDev.test("MOZCENTRAL")
? "resource://pdf.js/build/pdf.worker.mjs"
: "../build/pdf.worker.mjs",
kind: OptionKind.WORKER,
},
};
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
defaultOptions.defaultUrl = {
/** @type {string} */
value:
typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME")
? ""
: "compressed.tracemonkey-pldi-09.pdf",
kind: OptionKind.VIEWER,
};
defaultOptions.sandboxBundleSrc = {
/** @type {string} */
value:
typeof PDFJSDev === "undefined"
? "../build/dev-sandbox/pdf.sandbox.mjs"
: "../build/pdf.sandbox.mjs",
kind: OptionKind.VIEWER,
};
defaultOptions.enableFakeMLManager = {
/** @type {boolean} */
value: true,
kind: OptionKind.VIEWER,
};
}
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
defaultOptions.disablePreferences = {
/** @type {boolean} */
value: typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING"),
kind: OptionKind.VIEWER,
};
} else if (PDFJSDev.test("CHROME")) {
defaultOptions.disableTelemetry = {
/** @type {boolean} */
value: false,
kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
};
}
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
// Ensure that the `defaultOptions` are correctly specified.
for (const name in defaultOptions) {
const { value, kind, type } = defaultOptions[name];
if (kind & OptionKind.PREFERENCE) {
if (kind === OptionKind.PREFERENCE) {
throw new Error(`Cannot use only "PREFERENCE" kind: ${name}`);
}
if (kind & OptionKind.BROWSER) {
throw new Error(`Cannot mix "PREFERENCE" and "BROWSER" kind: ${name}`);
}
if (type !== undefined) {
throw new Error(
`Cannot have \`type\`-field for "PREFERENCE" kind: ${name}`
);
}
if (typeof compatParams === "object" && compatParams.has(name)) {
throw new Error(
`Should not have compatibility-value for "PREFERENCE" kind: ${name}`
);
}
// Only "simple" preference-values are allowed.
if (
typeof value !== "boolean" &&
typeof value !== "string" &&
!Number.isInteger(value)
) {
throw new Error(`Invalid value for "PREFERENCE" kind: ${name}`);
}
} else if (kind & OptionKind.BROWSER) {
if (type !== undefined) {
throw new Error(
`Cannot have \`type\`-field for "BROWSER" kind: ${name}`
);
}
if (typeof compatParams === "object" && compatParams.has(name)) {
throw new Error(
`Should not have compatibility-value for "BROWSER" kind: ${name}`
);
}
if (value === undefined) {
throw new Error(`Invalid value for "BROWSER" kind: ${name}`);
}
}
}
}
class AppOptions {
static eventBus;
static #opts = new Map();
static {
// Initialize all the user-options.
for (const name in defaultOptions) {
this.#opts.set(name, defaultOptions[name].value);
}
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
// Apply any compatibility-values to the user-options.
for (const [name, value] of compatParams) {
this.#opts.set(name, value);
}
this._hasInvokedSet = false;
this._checkDisablePreferences = () => {
if (this.get("disablePreferences")) {
// Give custom implementations of the default viewer a simpler way to
// opt-out of having the `Preferences` override existing `AppOptions`.
return true;
}
if (this._hasInvokedSet) {
console.warn(
"The Preferences may override manually set AppOptions; " +
'please use the "disablePreferences"-option to prevent that.'
);
}
return false;
};
}
}
constructor() {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
throw new Error("Cannot initialize AppOptions.");
}
}
static get(name) {
return this.#opts.get(name);
}
static getAll(kind = null, defaultOnly = false) {
const options = Object.create(null);
for (const name in defaultOptions) {
const defaultOpt = defaultOptions[name];
if (kind && !(kind & defaultOpt.kind)) {
continue;
}
options[name] = !defaultOnly ? this.#opts.get(name) : defaultOpt.value;
}
return options;
}
static set(name, value) {
this.setAll({ [name]: value });
}
static setAll(options, prefs = false) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
this._hasInvokedSet ||= true;
}
let events;
for (const name in options) {
const defaultOpt = defaultOptions[name],
userOpt = options[name];
if (
!defaultOpt ||
!(
typeof userOpt === typeof defaultOpt.value ||
Type[(typeof userOpt).toUpperCase()] & defaultOpt.type
)
) {
continue;
}
const { kind } = defaultOpt;
if (
prefs &&
!(kind & OptionKind.BROWSER || kind & OptionKind.PREFERENCE)
) {
continue;
}
if (this.eventBus && kind & OptionKind.EVENT_DISPATCH) {
(events ||= new Map()).set(name, userOpt);
}
this.#opts.set(name, userOpt);
}
if (events) {
for (const [name, value] of events) {
this.eventBus.dispatch(name.toLowerCase(), { source: this, value });
}
}
}
}
export { AppOptions, OptionKind };