elheif

A wasm heic image encoder and decoder library compiled from libheif, libde265 and kvazaar. The library is just a wrapper of libheif and compiled to WASM using Emscripten

API

``ts
interface DecodeImageResult {
err: string;
data: Array<{
width: number;
height: number;
/* RGBA8888 bitmap /
data: Uint8Array;
}>;
}

interface EncodeImageResult {
err: string;
data: Uint8Array;
}

/* Should be called and wait till promise fulfilled when using other APIs /
export function ensureInitialized(): Promise;

/* Convert heic image to RGBA bitmaps /
export function jsDecodeImage(buf: Uint8Array): DecodeImageResult;

/* Convert RGBA bitmap to heic image /
export function jsEncodeImage(
buf: Uint8Array,
width: number,
height: number
): EncodeImageResult;
`

Usage

`ts
it("decode", async () => {
await ensureInitialized();

const buf = loadHeicImage();
const res = jsDecodeImage(buf);

expect(res.err).eq("");
expect(res.data.length).eq(1);
expect(res.data[0].width).eq(10);
expect(res.data[0].height).eq(10);
});

it("encode", async () => {
await ensureInitialized();

const buf = loadHeicImage();
const bitmap = jsDecodeImage(buf).data[0];
const encoded = jsEncodeImage(bitmap.data, bitmap.width, bitmap.height);

expect(encoded.err).eq("");
expect(encoded.data.length).eq(1288);
});
`

License

MIT license. Also note the license for libheif, libde265 and kvazaar`.