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vendor/yomitan/js/dictionary/dictionary-importer-media-loader.js

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+/*
+ * Copyright (C) 2023-2025  Yomitan Authors
+ * Copyright (C) 2021-2022  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {EventListenerCollection} from '../core/event-listener-collection.js';
+
+/**
+ * Class used for loading and validating media during the dictionary import process.
+ */
+export class DictionaryImporterMediaLoader {
+    /** @type {import('dictionary-importer-media-loader').GetImageDetailsFunction} */
+    getImageDetails(content, mediaType, transfer) {
+        return new Promise((resolve, reject) => {
+            const image = new Image();
+            const eventListeners = new EventListenerCollection();
+            const cleanup = () => {
+                image.removeAttribute('src');
+                URL.revokeObjectURL(url);
+                eventListeners.removeAllEventListeners();
+            };
+            eventListeners.addEventListener(image, 'load', () => {
+                const {naturalWidth: width, naturalHeight: height} = image;
+                if (Array.isArray(transfer)) { transfer.push(content); }
+                cleanup();
+                resolve({content, width, height});
+            }, false);
+            eventListeners.addEventListener(image, 'error', () => {
+                cleanup();
+                reject(new Error('Image failed to load'));
+            }, false);
+            const blob = new Blob([content], {type: mediaType});
+            const url = URL.createObjectURL(blob);
+            image.src = url;
+        });
+    }
+}