image-in-browser/lib/formats/jpeg-decoder.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

import { InputBuffer } from '../common/input-buffer.js';
import { LibError } from '../error/lib-error.js';
import { ImageFormat } from './image-format.js';
import { JpegData } from './jpeg/jpeg-data.js';
export class JpegDecoder {
    get format() {
        return ImageFormat.jpg;
    }
    get numFrames() {
        return this._info !== undefined ? this._info.numFrames : 0;
    }
    isValidFile(bytes) {
        return new JpegData().validate(bytes);
    }
    startDecode(bytes) {
        this._input = new InputBuffer({
            buffer: bytes,
            bigEndian: true,
        });
        this._info = new JpegData().readInfo(bytes);
        return this._info;
    }
    decodeFrame(_) {
        if (this._input === undefined) {
            return undefined;
        }
        const jpeg = new JpegData();
        jpeg.read(this._input.buffer);
        if (jpeg.frames.length !== 1) {
            throw new LibError('Only single frame JPEGs supported.');
        }
        return jpeg.getImage();
    }
    decode(opt) {
        const bytes = opt.bytes;
        const jpeg = new JpegData();
        jpeg.read(bytes);
        if (jpeg.frames.length !== 1) {
            throw new LibError('Only single frame JPEGs supported.');
        }
        return jpeg.getImage();
    }
}
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