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-rw-r--r--browser/components/newtab/content-src/lib/screenshot-utils.js61
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diff --git a/browser/components/newtab/content-src/lib/screenshot-utils.js b/browser/components/newtab/content-src/lib/screenshot-utils.js
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-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/**
- * List of helper functions for screenshot-based images.
- *
- * There are two kinds of images:
- * 1. Remote Image: This is the image from the main process and it refers to
- * the image in the React props. This can either be an object with the `data`
- * and `path` properties, if it is a blob, or a string, if it is a normal image.
- * 2. Local Image: This is the image object in the content process and it refers
- * to the image *object* in the React component's state. All local image
- * objects have the `url` property, and an additional property `path`, if they
- * are blobs.
- */
-export const ScreenshotUtils = {
- isBlob(isLocal, image) {
- return !!(
- image &&
- image.path &&
- ((!isLocal && image.data) || (isLocal && image.url))
- );
- },
-
- // This should always be called with a remote image and not a local image.
- createLocalImageObject(remoteImage) {
- if (!remoteImage) {
- return null;
- }
- if (this.isBlob(false, remoteImage)) {
- return {
- url: global.URL.createObjectURL(remoteImage.data),
- path: remoteImage.path,
- };
- }
- return { url: remoteImage };
- },
-
- // Revokes the object URL of the image if the local image is a blob.
- // This should always be called with a local image and not a remote image.
- maybeRevokeBlobObjectURL(localImage) {
- if (this.isBlob(true, localImage)) {
- global.URL.revokeObjectURL(localImage.url);
- }
- },
-
- // Checks if remoteImage and localImage are the same.
- isRemoteImageLocal(localImage, remoteImage) {
- // Both remoteImage and localImage are present.
- if (remoteImage && localImage) {
- return this.isBlob(false, remoteImage)
- ? localImage.path === remoteImage.path
- : localImage.url === remoteImage;
- }
-
- // This will only handle the remaining three possible outcomes.
- // (i.e. everything except when both image and localImage are present)
- return !remoteImage && !localImage;
- },
-};