@jsquash/png/encode.js

Wasm png encoder and decoder supporting the browser. Repackaged from Squoosh App.

/**
 * 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.
 */
import initPngModule, { encode as pngEncode } from './codec/pkg/squoosh_png.js';
let pngModule;
export async function init(moduleOrPath) {
    if (!pngModule) {
        pngModule = initPngModule(moduleOrPath);
    }
    return pngModule;
}
export default async function encode(data, options = {}) {
    var _a;
    await init();
    const bitDepth = (_a = options === null || options === void 0 ? void 0 : options.bitDepth) !== null && _a !== void 0 ? _a : 8;
    if (bitDepth !== 8 && bitDepth !== 16) {
        throw new Error('Invalid bit depth. Must be either 8 or 16.');
    }
    const isUint16Array = data.data instanceof Uint16Array;
    if (isUint16Array && bitDepth !== 16) {
        throw new Error('Invalid bit depth, must be 16 for Uint16Array or manually convert to RGB8 values with Uint8Array.');
    }
    if (!isUint16Array && bitDepth === 16) {
        throw new Error('Invalid bit depth, must be 8 for Uint8Array or manually convert to RGB16 values with Uint16Array.');
    }
    const encodeData = new Uint8Array(data.data.buffer);
    const output = await pngEncode(encodeData, data.width, data.height, bitDepth);
    if (!output)
        throw new Error('Encoding error.');
    return output.buffer;
}