ktx2-encoder/dist/node/NodeBasisEncoder.js

KTX2(.ktx2) encoder for browser applications

import { HDRSourceType, SourceType } from "../enum.js";
import { applyInputOptions } from "../applyInputOptions.js";
import BASIS from "../basis/basis_encoder.js";
let promise = null;
class NodeBasisEncoder {
    async init() {
        if (!promise) {
            promise = BASIS().then((basis) => {
                basis.initializeBasis();
                return basis;
            });
        }
        return promise;
    }
    async encode(bufferOrBufferArray, options = {}) {
        const basis = await this.init();
        const encoder = new basis.BasisEncoder();
        try {
            const bufferArray = Array.isArray(bufferOrBufferArray) ? bufferOrBufferArray : [bufferOrBufferArray];
            applyInputOptions(options, encoder);
            for (let i = 0; i < bufferArray.length; i++) {
                const buffer = bufferArray[i];
                if (options.isHDR) {
                    encoder.setSliceSourceImageHDR(i, buffer, 0, 0, options.imageType === "hdr" ? HDRSourceType.HDR : HDRSourceType.EXR, true);
                }
                else {
                    const imageData = await options.imageDecoder(buffer);
                    encoder.setSliceSourceImage(i, new Uint8Array(imageData.data), imageData.width, imageData.height, SourceType.RAW);
                }
            }
            const resultData = new Uint8Array(1024 * 1024 * (options.isHDR ? 24 : 10));
            const resultSize = encoder.encode(resultData);
            if (resultSize === 0) {
                throw new Error("Encode failed");
            }
            return Buffer.from(resultData.subarray(0, resultSize));
        }
        finally {
            // Free the WASM-allocated encoder. Without this, every encode call leaks
            // the encoder struct in the WASM heap, eventually exhausting it and
            // causing `new BasisEncoder()` itself to throw "Out of bounds memory access"
            // after ~65 calls in long-running processes (batch tools, workers).
            encoder.delete();
        }
    }
}
export const nodeEncoder = new NodeBasisEncoder();