compress-jpeg/compress_jpeg.js

A simple JPEG compression library for WebAssembly

let wasm;

function addToExternrefTable0(obj) {
    const idx = wasm.__externref_table_alloc();
    wasm.__wbindgen_externrefs.set(idx, obj);
    return idx;
}

function getClampedArrayU8FromWasm0(ptr, len) {
    ptr = ptr >>> 0;
    return getUint8ClampedArrayMemory0().subarray(ptr / 1, ptr / 1 + len);
}

let cachedDataViewMemory0 = null;
function getDataViewMemory0() {
    if (cachedDataViewMemory0 === null || cachedDataViewMemory0.buffer.detached === true || (cachedDataViewMemory0.buffer.detached === undefined && cachedDataViewMemory0.buffer !== wasm.memory.buffer)) {
        cachedDataViewMemory0 = new DataView(wasm.memory.buffer);
    }
    return cachedDataViewMemory0;
}

function getStringFromWasm0(ptr, len) {
    ptr = ptr >>> 0;
    return decodeText(ptr, len);
}

let cachedUint8ArrayMemory0 = null;
function getUint8ArrayMemory0() {
    if (cachedUint8ArrayMemory0 === null || cachedUint8ArrayMemory0.byteLength === 0) {
        cachedUint8ArrayMemory0 = new Uint8Array(wasm.memory.buffer);
    }
    return cachedUint8ArrayMemory0;
}

let cachedUint8ClampedArrayMemory0 = null;
function getUint8ClampedArrayMemory0() {
    if (cachedUint8ClampedArrayMemory0 === null || cachedUint8ClampedArrayMemory0.byteLength === 0) {
        cachedUint8ClampedArrayMemory0 = new Uint8ClampedArray(wasm.memory.buffer);
    }
    return cachedUint8ClampedArrayMemory0;
}

function handleError(f, args) {
    try {
        return f.apply(this, args);
    } catch (e) {
        const idx = addToExternrefTable0(e);
        wasm.__wbindgen_exn_store(idx);
    }
}

function passArray8ToWasm0(arg, malloc) {
    const ptr = malloc(arg.length * 1, 1) >>> 0;
    getUint8ArrayMemory0().set(arg, ptr / 1);
    WASM_VECTOR_LEN = arg.length;
    return ptr;
}

function takeFromExternrefTable0(idx) {
    const value = wasm.__wbindgen_externrefs.get(idx);
    wasm.__externref_table_dealloc(idx);
    return value;
}

let cachedTextDecoder = new TextDecoder('utf-8', { ignoreBOM: true, fatal: true });
cachedTextDecoder.decode();
const MAX_SAFARI_DECODE_BYTES = 2146435072;
let numBytesDecoded = 0;
function decodeText(ptr, len) {
    numBytesDecoded += len;
    if (numBytesDecoded >= MAX_SAFARI_DECODE_BYTES) {
        cachedTextDecoder = new TextDecoder('utf-8', { ignoreBOM: true, fatal: true });
        cachedTextDecoder.decode();
        numBytesDecoded = len;
    }
    return cachedTextDecoder.decode(getUint8ArrayMemory0().subarray(ptr, ptr + len));
}

let WASM_VECTOR_LEN = 0;

/**
 * Compress an ImageData using a simplified JPEG-style pipeline.
 *
 * **Parameters:**
 * - `image_data`: The RGBA ImageData to compress.
 * - `compression`: A value from 0.0–1.0:
 *     - 0.0 = no compression (highest quality)
 *     - 1.0 = strongest compression (lowest quality)
 *
 * **Returns:**
 * A new `ImageData` object containing the visually compressed pixels.
 * @param {ImageData} image_data
 * @param {number} compression
 * @returns {ImageData}
 */
export function compress_jpeg(image_data, compression) {
    const ret = wasm.compress_jpeg(image_data, compression);
    if (ret[2]) {
        throw takeFromExternrefTable0(ret[1]);
    }
    return takeFromExternrefTable0(ret[0]);
}

const EXPECTED_RESPONSE_TYPES = new Set(['basic', 'cors', 'default']);

async function __wbg_load(module, imports) {
    if (typeof Response === 'function' && module instanceof Response) {
        if (typeof WebAssembly.instantiateStreaming === 'function') {
            try {
                return await WebAssembly.instantiateStreaming(module, imports);
            } catch (e) {
                const validResponse = module.ok && EXPECTED_RESPONSE_TYPES.has(module.type);

                if (validResponse && module.headers.get('Content-Type') !== 'application/wasm') {
                    console.warn("`WebAssembly.instantiateStreaming` failed because your server does not serve Wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\n", e);

                } else {
                    throw e;
                }
            }
        }

        const bytes = await module.arrayBuffer();
        return await WebAssembly.instantiate(bytes, imports);
    } else {
        const instance = await WebAssembly.instantiate(module, imports);

        if (instance instanceof WebAssembly.Instance) {
            return { instance, module };
        } else {
            return instance;
        }
    }
}

function __wbg_get_imports() {
    const imports = {};
    imports.wbg = {};
    imports.wbg.__wbg___wbindgen_throw_dd24417ed36fc46e = function(arg0, arg1) {
        throw new Error(getStringFromWasm0(arg0, arg1));
    };
    imports.wbg.__wbg_data_83b2a9a09dd4ab39 = function(arg0, arg1) {
        const ret = arg1.data;
        const ptr1 = passArray8ToWasm0(ret, wasm.__wbindgen_malloc);
        const len1 = WASM_VECTOR_LEN;
        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
    };
    imports.wbg.__wbg_height_93d6779af8295699 = function(arg0) {
        const ret = arg0.height;
        return ret;
    };
    imports.wbg.__wbg_new_with_u8_clamped_array_and_sh_5ac77cce3f6497ff = function() { return handleError(function (arg0, arg1, arg2, arg3) {
        const ret = new ImageData(getClampedArrayU8FromWasm0(arg0, arg1), arg2 >>> 0, arg3 >>> 0);
        return ret;
    }, arguments) };
    imports.wbg.__wbg_width_73a6511a2370c184 = function(arg0) {
        const ret = arg0.width;
        return ret;
    };
    imports.wbg.__wbindgen_cast_2241b6af4c4b2941 = function(arg0, arg1) {
        // Cast intrinsic for `Ref(String) -> Externref`.
        const ret = getStringFromWasm0(arg0, arg1);
        return ret;
    };
    imports.wbg.__wbindgen_init_externref_table = function() {
        const table = wasm.__wbindgen_externrefs;
        const offset = table.grow(4);
        table.set(0, undefined);
        table.set(offset + 0, undefined);
        table.set(offset + 1, null);
        table.set(offset + 2, true);
        table.set(offset + 3, false);
    };

    return imports;
}

function __wbg_finalize_init(instance, module) {
    wasm = instance.exports;
    __wbg_init.__wbindgen_wasm_module = module;
    cachedDataViewMemory0 = null;
    cachedUint8ArrayMemory0 = null;
    cachedUint8ClampedArrayMemory0 = null;


    wasm.__wbindgen_start();
    return wasm;
}

function initSync(module) {
    if (wasm !== undefined) return wasm;


    if (typeof module !== 'undefined') {
        if (Object.getPrototypeOf(module) === Object.prototype) {
            ({module} = module)
        } else {
            console.warn('using deprecated parameters for `initSync()`; pass a single object instead')
        }
    }

    const imports = __wbg_get_imports();
    if (!(module instanceof WebAssembly.Module)) {
        module = new WebAssembly.Module(module);
    }
    const instance = new WebAssembly.Instance(module, imports);
    return __wbg_finalize_init(instance, module);
}

async function __wbg_init(module_or_path) {
    if (wasm !== undefined) return wasm;


    if (typeof module_or_path !== 'undefined') {
        if (Object.getPrototypeOf(module_or_path) === Object.prototype) {
            ({module_or_path} = module_or_path)
        } else {
            console.warn('using deprecated parameters for the initialization function; pass a single object instead')
        }
    }

    if (typeof module_or_path === 'undefined') {
        module_or_path = new URL('compress_jpeg_bg.wasm', import.meta.url);
    }
    const imports = __wbg_get_imports();

    if (typeof module_or_path === 'string' || (typeof Request === 'function' && module_or_path instanceof Request) || (typeof URL === 'function' && module_or_path instanceof URL)) {
        module_or_path = fetch(module_or_path);
    }

    const { instance, module } = await __wbg_load(await module_or_path, imports);

    return __wbg_finalize_init(instance, module);
}

export { initSync };
export default __wbg_init;