image-js/lib/load/decodeJpeg.js

Image processing and manipulation in JavaScript

import { decode as decodeExif } from 'fast-jpeg';
import { decode } from 'jpeg-js';
import { Image } from '../Image.js';
import { getMetadata } from './getMetadata.js';
/**
 * Decode a jpeg. See the jpeg-js npm module.
 * @param buffer - The data to decode.
 * @returns The decoded image.
 */
export function decodeJpeg(buffer) {
    const jpeg = decode(buffer, {
        useTArray: true,
        maxMemoryUsageInMB: Number.POSITIVE_INFINITY,
        maxResolutionInMP: Number.POSITIVE_INFINITY,
    });
    const decodedExif = decodeExif(buffer);
    // TODO : handle stacks (many IFDs?)
    const meta = decodedExif.exif?.[0]
        ? getMetadata(decodedExif.exif[0])
        : undefined;
    return new Image(jpeg.width, jpeg.height, {
        data: jpeg.data,
        colorModel: 'RGBA',
        meta,
    });
}
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