44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
// Copyright 2018-2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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const loadImage = require('blueimp-load-image');
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const DEFAULT_JPEG_QUALITY = 0.85;
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// File | Blob | URLString -> LoadImageOptions -> Promise<DataURLString>
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//
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// Documentation for `options` (`LoadImageOptions`):
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// https://github.com/blueimp/JavaScript-Load-Image/tree/v2.18.0#options
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exports.autoOrientImage = (fileOrBlobOrURL, options = {}) => {
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const optionsWithDefaults = {
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type: 'image/jpeg',
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quality: DEFAULT_JPEG_QUALITY,
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...options,
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canvas: true,
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orientation: true,
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};
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return new Promise((resolve, reject) => {
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loadImage(
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fileOrBlobOrURL,
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canvasOrError => {
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if (canvasOrError.type === 'error') {
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const error = new Error('autoOrientImage: Failed to process image');
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error.cause = canvasOrError;
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reject(error);
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return;
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}
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const canvas = canvasOrError;
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const dataURL = canvas.toDataURL(
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optionsWithDefaults.type,
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optionsWithDefaults.quality
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);
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resolve(dataURL);
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},
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optionsWithDefaults
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);
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});
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};
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