@larscom/image-data
Version:
create ImageData object from URL or ArrayBuffer without creating a canvas (using wasm)
250 lines (204 loc) • 6.99 kB
JavaScript
let wasm;
const cachedTextDecoder = (typeof TextDecoder !== 'undefined' ? new TextDecoder('utf-8', { ignoreBOM: true, fatal: true }) : { decode: () => { throw Error('TextDecoder not available') } } );
if (typeof TextDecoder !== 'undefined') { cachedTextDecoder.decode(); };
let cachedUint8ArrayMemory0 = null;
function getUint8ArrayMemory0() {
if (cachedUint8ArrayMemory0 === null || cachedUint8ArrayMemory0.byteLength === 0) {
cachedUint8ArrayMemory0 = new Uint8Array(wasm.memory.buffer);
}
return cachedUint8ArrayMemory0;
}
function getStringFromWasm0(ptr, len) {
ptr = ptr >>> 0;
return cachedTextDecoder.decode(getUint8ArrayMemory0().subarray(ptr, ptr + len));
}
let WASM_VECTOR_LEN = 0;
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 getArrayU8FromWasm0(ptr, len) {
ptr = ptr >>> 0;
return getUint8ArrayMemory0().subarray(ptr / 1, ptr / 1 + len);
}
/**
* @param {Uint8Array} image_bytes
* @returns {Image}
*/
export function get_image(image_bytes) {
const ptr0 = passArray8ToWasm0(image_bytes, wasm.__wbindgen_malloc);
const len0 = WASM_VECTOR_LEN;
const ret = wasm.get_image(ptr0, len0);
return Image.__wrap(ret);
}
/**
* Chroma subsampling format
* @enum {0 | 1 | 2 | 3}
*/
export const ChromaSampling = Object.freeze({
/**
* Both vertically and horizontally subsampled.
*/
Cs420: 0, "0": "Cs420",
/**
* Horizontally subsampled.
*/
Cs422: 1, "1": "Cs422",
/**
* Not subsampled.
*/
Cs444: 2, "2": "Cs444",
/**
* Monochrome.
*/
Cs400: 3, "3": "Cs400",
});
const ImageFinalization = (typeof FinalizationRegistry === 'undefined')
? { register: () => {}, unregister: () => {} }
: new FinalizationRegistry(ptr => wasm.__wbg_image_free(ptr >>> 0, 1));
export class Image {
static __wrap(ptr) {
ptr = ptr >>> 0;
const obj = Object.create(Image.prototype);
obj.__wbg_ptr = ptr;
ImageFinalization.register(obj, obj.__wbg_ptr, obj);
return obj;
}
__destroy_into_raw() {
const ptr = this.__wbg_ptr;
this.__wbg_ptr = 0;
ImageFinalization.unregister(this);
return ptr;
}
free() {
const ptr = this.__destroy_into_raw();
wasm.__wbg_image_free(ptr, 0);
}
/**
* @param {number} width
* @param {number} height
* @param {Uint8Array} data
* @returns {Image}
*/
static new(width, height, data) {
const ptr0 = passArray8ToWasm0(data, wasm.__wbindgen_malloc);
const len0 = WASM_VECTOR_LEN;
const ret = wasm.image_new(width, height, ptr0, len0);
return Image.__wrap(ret);
}
/**
* @returns {number}
*/
width() {
const ret = wasm.image_width(this.__wbg_ptr);
return ret >>> 0;
}
/**
* @returns {number}
*/
height() {
const ret = wasm.image_height(this.__wbg_ptr);
return ret >>> 0;
}
/**
* @returns {Uint8Array}
*/
data() {
const ret = wasm.image_data(this.__wbg_ptr);
var v1 = getArrayU8FromWasm0(ret[0], ret[1]).slice();
wasm.__wbindgen_free(ret[0], ret[1] * 1, 1);
return v1;
}
}
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) {
if (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.__wbindgen_init_externref_table = function() {
const table = wasm.__wbindgen_export_0;
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);
;
};
imports.wbg.__wbindgen_throw = function(arg0, arg1) {
throw new Error(getStringFromWasm0(arg0, arg1));
};
return imports;
}
function __wbg_init_memory(imports, memory) {
}
function __wbg_finalize_init(instance, module) {
wasm = instance.exports;
__wbg_init.__wbindgen_wasm_module = module;
cachedUint8ArrayMemory0 = 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();
__wbg_init_memory(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('image_data_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);
}
__wbg_init_memory(imports);
const { instance, module } = await __wbg_load(await module_or_path, imports);
return __wbg_finalize_init(instance, module);
}
export { initSync };
export default __wbg_init;