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decode.ts
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decode.ts
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/**
* Copyright 2020 Google Inc. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Notice: I (Jamie Sinclair) have copied this code from the @jsquash/webp decode module
* and modified it to decode JPEG XL images.
*/
import jxlDecoder, { JXLModule } from './codec/dec/jxl_dec.js';
import { initEmscriptenModule } from './utils.js';
let emscriptenModule: Promise<JXLModule>;
export async function init(
module?: WebAssembly.Module,
moduleOptionOverrides?: Partial<EmscriptenWasm.ModuleOpts>,
): Promise<JXLModule> {
emscriptenModule = initEmscriptenModule(
jxlDecoder,
module,
moduleOptionOverrides,
);
return emscriptenModule;
}
export default async function decode(buffer: ArrayBuffer): Promise<ImageData> {
if (!emscriptenModule) emscriptenModule = init();
const module = await emscriptenModule;
const result = module.decode(buffer);
if (!result) throw new Error('Decoding error');
return result;
}