feat: add deno_rust_wasm_qr_decode

This commit is contained in:
2022-07-03 00:34:15 +08:00
parent 713e1424f9
commit 4359817513
15 changed files with 829 additions and 1 deletions

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/target

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max_width = 80
tab_spaces = 2
edition = "2021"

586
__wasm/deno_rust_wasm_qr_decode/Cargo.lock generated Normal file
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[workspace]
members = [
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]

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{
"tasks": {
"wasmbuild": "deno run -A https://deno.land/x/wasmbuild@0.8.2/main.ts"
}
}

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_:
@just --list
build_wasm:
deno task wasmbuild
run:
deno run --allow-read main.js

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// @generated file from wasmbuild -- do not edit
// deno-lint-ignore-file
// deno-fmt-ignore-file
// source-hash: 7b04f965aad3774d53b13732c0edf9275f95b5a7
let wasm;
let cachedUint8Memory0;
function getUint8Memory0() {
if (cachedUint8Memory0.byteLength === 0) {
cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
}
return cachedUint8Memory0;
}
let WASM_VECTOR_LEN = 0;
function passArray8ToWasm0(arg, malloc) {
const ptr = malloc(arg.length * 1);
getUint8Memory0().set(arg, ptr / 1);
WASM_VECTOR_LEN = arg.length;
return ptr;
}
let cachedInt32Memory0;
function getInt32Memory0() {
if (cachedInt32Memory0.byteLength === 0) {
cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
}
return cachedInt32Memory0;
}
const cachedTextDecoder = new TextDecoder("utf-8", {
ignoreBOM: true,
fatal: true,
});
cachedTextDecoder.decode();
function getStringFromWasm0(ptr, len) {
return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
}
/**
* @param {Uint8Array} image_bytes
* @returns {string}
*/
export function decode_qr(image_bytes) {
try {
const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
const ptr0 = passArray8ToWasm0(image_bytes, wasm.__wbindgen_malloc);
const len0 = WASM_VECTOR_LEN;
wasm.decode_qr(retptr, ptr0, len0);
var r0 = getInt32Memory0()[retptr / 4 + 0];
var r1 = getInt32Memory0()[retptr / 4 + 1];
return getStringFromWasm0(r0, r1);
} finally {
wasm.__wbindgen_add_to_stack_pointer(16);
wasm.__wbindgen_free(r0, r1);
}
}
const imports = {
__wbindgen_placeholder__: {},
};
const wasm_url = new URL("rs_lib_bg.wasm", import.meta.url);
/**
* Decompression callback
*
* @callback decompressCallback
* @param {Uint8Array} compressed
* @return {Uint8Array} decompressed
*/
/** Instantiates an instance of the Wasm module returning its functions.
* @remarks It is safe to call this multiple times and once successfully
* loaded it will always return a reference to the same object.
* @param {decompressCallback=} transform
*/
export async function instantiate(transform) {
return (await instantiateWithInstance(transform)).exports;
}
let instanceWithExports;
let lastLoadPromise;
/** Instantiates an instance of the Wasm module along with its exports.
* @remarks It is safe to call this multiple times and once successfully
* loaded it will always return a reference to the same object.
* @param {decompressCallback=} transform
* @returns {Promise<{
* instance: WebAssembly.Instance;
* exports: { decode_qr: typeof decode_qr }
* }>}
*/
export function instantiateWithInstance(transform) {
if (instanceWithExports != null) {
return Promise.resolve(instanceWithExports);
}
if (lastLoadPromise == null) {
lastLoadPromise = (async () => {
try {
const instance = (await instantiateModule(transform)).instance;
wasm = instance.exports;
cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
instanceWithExports = {
instance,
exports: getWasmInstanceExports(),
};
return instanceWithExports;
} finally {
lastLoadPromise = null;
}
})();
}
return lastLoadPromise;
}
function getWasmInstanceExports() {
return { decode_qr };
}
/** Gets if the Wasm module has been instantiated. */
export function isInstantiated() {
return instanceWithExports != null;
}
async function instantiateModule(transform) {
switch (wasm_url.protocol) {
case "file:": {
if (typeof Deno !== "object") {
throw new Error("file urls are not supported in this environment");
}
if ("permissions" in Deno) {
Deno.permissions.request({ name: "read", path: wasm_url });
}
const wasmCode = await Deno.readFile(wasm_url);
return WebAssembly.instantiate(
!transform ? wasmCode : transform(wasmCode),
imports,
);
}
case "https:":
case "http:": {
if (typeof Deno === "object" && "permissions" in Deno) {
Deno.permissions.request({ name: "net", host: wasm_url.host });
}
const wasmResponse = await fetch(wasm_url);
if (transform) {
const wasmCode = new Uint8Array(await wasmResponse.arrayBuffer());
return WebAssembly.instantiate(transform(wasmCode), imports);
}
if (
wasmResponse.headers.get("content-type")?.toLowerCase().startsWith(
"application/wasm",
)
) {
return WebAssembly.instantiateStreaming(wasmResponse, imports);
} else {
return WebAssembly.instantiate(
await wasmResponse.arrayBuffer(),
imports,
);
}
}
default:
throw new Error(`Unsupported protocol: ${wasm_url.protocol}`);
}
}

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import { instantiate } from "./lib/rs_lib.generated.js";
const { decode_qr } = await instantiate();
const bytes = await Deno.readFile("test_qr_3.png");
console.log(decode_qr(bytes));

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[package]
name = "rs_lib"
version = "0.0.0"
edition = "2021"
[lib]
crate_type = ["cdylib"]
[profile.release]
codegen-units = 1
incremental = true
lto = true
opt-level = "z"
[dependencies]
wasm-bindgen = "=0.2.81"
bardecoder = "0.3.0"
image = "0.23"

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use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub fn decode_qr(image_bytes: &[u8]) -> String {
let img = match image::load_from_memory(image_bytes) {
Ok(img) => img,
Err(e) => return format!("ERROR:{}", e),
};
let decoder = bardecoder::default_decoder();
let results = decoder.decode(&img);
let mut r = vec![];
for result in results {
match result {
Ok(s) => r.push(vec![s, "".to_string()]),
Err(e) => r.push(vec!["".to_string(), format!("error: {}", e)]),
}
}
format!("{:?}", r)
}

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