{"id":45346,"date":"2023-11-04T02:00:45","date_gmt":"2022-12-16T08:31:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45346-2\/"},"modified":"2024-05-04T07:24:36","modified_gmt":"2024-05-03T23:24:36","slug":"45346-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45346-2\/","title":{"rendered":""},"content":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u306f\u300cWACUL Advent Calendar 2017\u300d\u306e5\u65e5\u76ee\u3067\u3059\u3002<br \/>\nWACUL\u3067\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b@bokuweb\u3068\u7533\u3057\u307e\u3059\u3002<\/p>\n<p>\u8868\u984c\u306e\u901a\u308a\u3067\u3059\u304cRust\u3068WebAssembly\u3092\u4f7f\u7528\u3057\u3066png\u30c7\u30b3\u30fc\u30c9\u3092\u884c\u3046node_module\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<h2>\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3042\u308bmodule\u3067\u4f7f\u7528\u3057\u3066\u3044\u308bpngjs\u306b\u3088\u308b\u30c7\u30b3\u30fc\u30c9\u51e6\u7406\u304c\u6642\u9593\u3092\u98df\u3063\u3066\u304a\u308awasm\u3067\u9ad8\u901f\u5316\u3067\u304d\u306a\u3044\u304b\u306e\u8abf\u67fb<\/ul>\n<\/li>\n<\/ul>\n<p>wasm32-unknown-unknown\u3092\u4f7f\u3063\u3066node_module\u3092\u4f5c\u308b\u3068\u3053\u307e\u3067\u4f53\u9a13\u3057\u3068\u304d\u305f\u3044<\/p>\n<h2>\u30ea\u30dd\u30b8\u30c8\u30ea<\/h2>\n<h2>Rust\u3068WebAssembly<\/h2>\n<p>\u3053\u308c\u307e\u3067\u306fwasm32-unknown-emscripten\u3092\u6307\u5b9a\u3057\u3066\u3001emscripten\u3092\u4ecb\u3057\u3066wasm\u3092\u51fa\u529b\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u305f\u3093\u3067\u3059\u304c\u3001\u5148\u65e5\u306e\u30ea\u30ea\u30fc\u30b9\u306b\u304a\u3044\u30661.24.0-nightly\u3067wasm32-unknown-unknown\u3068\u3044\u3046target\u304c\u6307\u5b9a\u53ef\u80fd\u3068\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308aemscripten\u306a\u3057\u306bRust\u304b\u3089wasm\u3092\u5410\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3081\u3067\u305f\u3044<\/p>\n<h2>\u307e\u305a\u306f\u7c21\u5358\u306a\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f5c\u3063\u3066\u307f\u308b<\/h2>\n<p>\u307e\u305a\u306f\u5f15\u6570\u306b1\u3092\u52a0\u7b97\u3057\u3066\u8fd4\u3059\u3060\u3051\u306e\u5358\u7d14\u306a\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f5c\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<h3>Rust\u5074<\/h3>\n<p>\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3002<\/p>\n<pre class=\"post-pre\"><code>rustup update\r\nrustup target add wasm32-unknown-unknown <span class=\"nt\">--toolchain<\/span> nightly\r\ncargo init <span class=\"nt\">--bin<\/span> add\r\n<\/code><\/pre>\n<p>main.rs\u3092\u7de8\u96c6\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{}<\/span>\r\n\r\n<span class=\"nd\">#[no_mangle]<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">add_one<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">:<\/span> <span class=\"nb\">i32<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">i32<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">x<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30d3\u30eb\u30c9\u3002<\/p>\n<pre class=\"post-pre\"><code>rustc +nightly --target wasm32-unknown-unknown src\/main.rs -o main.wasm\r\n<\/code><\/pre>\n<p>main.wasm\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u305f\u3089\u6210\u529f\u3067\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306f\u86c7\u8db3\u3067\u4eca\u56de\u306e\u8abf\u67fb\u3067\u77e5\u3063\u305f\u3093\u3067\u3059\u304c\u3001wasm-gc\u3068\u3044\u3046Rust\u88fd\u306e\u30c4\u30fc\u30eb\u304c\u3042\u308b\u3088\u3046\u3067\u3001\u3053\u3044\u3064\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u672a\u4f7f\u7528\u95a2\u6570\u306e\u524a\u9664\u306a\u3069\u304c\u884c\u308f\u308c\u30b5\u30a4\u30ba\u30c0\u30a6\u30f3\u304c\u3067\u304d\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>cargo install --git https:\/\/github.com\/alexcrichton\/wasm-gc\r\nwasm-gc main.wasm main.min.wasm\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306b\u3088\u308a\u672c\u30b1\u30fc\u30b9\u3067\u306f15kiB\u304c108B\u307e\u3067\u843d\u3061\u307e\u3057\u305f\u3002\uff08\u3053\u306e\u6642\u70b9\u3067\u306f\u3001\u3081\u3063\u3061\u3083\u304a\u3061\u308b\u3058\u3083\u306a\u3044\u3067\u3059\u304b\u3002\u3084\u3060\u30fc\u3002\u3063\u3066\u306a\u3063\u3066\u305f\u3093\u3067\u3059\u304c\u3001\u73fe\u5b9f\u306f\u7518\u304f\u306a\u304b\u3063\u305f\u3067\u3059\u3002\u5f8c\u8ff0\u3002)<\/p>\n<h3>JS\u5074<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">fs<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">fs<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">wasm<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">fs<\/span><span class=\"p\">.<\/span><span class=\"nx\">readFileSync<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">.\/main.wasm<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">mod<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">WebAssembly<\/span><span class=\"p\">.<\/span><span class=\"nx\">Instance<\/span><span class=\"p\">(<\/span><span class=\"k\">new<\/span> <span class=\"nx\">WebAssembly<\/span><span class=\"p\">.<\/span><span class=\"nx\">Module<\/span><span class=\"p\">(<\/span><span class=\"nx\">wasm<\/span><span class=\"p\">));<\/span>\r\n\r\n<span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">add_one<\/span><span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">));<\/span> <span class=\"c1\">\/\/ -&gt; 3<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>node index.js\r\n<\/code><\/pre>\n<p>\u826f\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n<h2>png\u306e\u30c7\u30b3\u30fc\u30c9\u3092\u884c\u3046<\/h2>\n<p>\u3067\u306f\u672c\u984c\u306epng\u30c7\u30b3\u30fc\u30c9\u3092\u884c\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<h3>Rust\u5074<\/h3>\n<p>emscripten\u304c\u306a\u3044\u305f\u3081alloc,free\u306f\u81ea\u5206\u3067\u7528\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\nJS\u3068\u306e\u3084\u308a\u53d6\u308a\u3082\u542b\u3081\u4ee5\u4e0b\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u3092\u53c2\u8003\u306b\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u4eca\u56de\u521d\u3081\u3066\u77e5\u3063\u305f\u3093\u3067\u3059\u304c\u3001mem::forget()\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u3089\u3057\u304f\u3001\u3053\u308c\u306b\u3088\u308a\u30b9\u30b3\u30fc\u30d7\u3092\u629c\u3051\u305f\u5f8c\u3082\u78ba\u4fdd\u3057\u305f\u30d2\u30fc\u30d7\u304c\u89e3\u653e\u3055\u308c\u306a\u3044\u3088\u3046\u3067\u3059\u3002free\u306e\u307b\u3046\u306f\u6307\u5b9a\u9818\u57df\u306e\u30d2\u30fc\u30d7\u3092\u518d\u78ba\u4fdd\u3057\u3066\u3084\u308aDrop\u6642\u306b\u89e3\u653e\u3057\u3066\u3082\u3089\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>png\u306e\u30c7\u30b3\u30fc\u30c9\u306b\u306f\u4ee5\u4e0b\u306ecrate\u3092\u4f7f\u7528\u3057\u3066\u3044\u3066\u3001JS\u5074\u304b\u3089\u3082\u3089\u3063\u305f\u30d0\u30c3\u30d5\u30a1\u3092\u3053\u3044\u3064\u306b\u98df\u308f\u305b\u308b\u3053\u3068\u3067\u30c7\u30b3\u30fc\u30c9\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5f8c\u306fwidth\u3084height\u3068\u3044\u3063\u305f\u60c5\u5831\u3068\u30c7\u30b3\u30fc\u30c9\u7d50\u679c\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u3066JS\u5074\u306b\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u8fba\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u30fb\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306e\u30b3\u30b9\u30c8\u3082\u52ff\u4f53\u7121\u3044\u306e\u3067\u306a\u3093\u3068\u304b\u3057\u305f\u3044\u306e\u3067\u3059\u304c\u3001\u3044\u3044\u65b9\u6cd5\u304c\u308f\u304b\u3063\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">png<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"nn\">os<\/span><span class=\"p\">::<\/span><span class=\"nn\">raw<\/span><span class=\"p\">::{<\/span><span class=\"nb\">c_char<\/span><span class=\"p\">,<\/span> <span class=\"nb\">c_void<\/span><span class=\"p\">};<\/span>\r\n<span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"n\">mem<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"nn\">ffi<\/span><span class=\"p\">::<\/span><span class=\"n\">CString<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"nd\">#[macro_use]<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">serde_derive<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">serde<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">serde_json<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"nd\">#[no_mangle]<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">alloc<\/span><span class=\"p\">(<\/span><span class=\"n\">size<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">c_void<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">buf<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">Vec<\/span><span class=\"p\">::<\/span><span class=\"nf\">with_capacity<\/span><span class=\"p\">(<\/span><span class=\"n\">size<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">ptr<\/span> <span class=\"o\">=<\/span> <span class=\"n\">buf<\/span><span class=\"nf\">.as_mut_ptr<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nn\">mem<\/span><span class=\"p\">::<\/span><span class=\"nf\">forget<\/span><span class=\"p\">(<\/span><span class=\"n\">buf<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">ptr<\/span> <span class=\"k\">as<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">c_void<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"nd\">#[no_mangle]<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">free<\/span><span class=\"p\">(<\/span><span class=\"n\">ptr<\/span><span class=\"p\">:<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">c_void<\/span><span class=\"p\">,<\/span> <span class=\"n\">size<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">buf<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">Vec<\/span><span class=\"p\">::<\/span><span class=\"nf\">from_raw_parts<\/span><span class=\"p\">(<\/span><span class=\"n\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"n\">size<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{}<\/span>\r\n\r\n<span class=\"nd\">#[derive(Serialize)]<\/span>\r\n<span class=\"nd\">#[serde(rename_all<\/span> <span class=\"nd\">=<\/span> <span class=\"s\">\"camelCase\"<\/span><span class=\"nd\">)]<\/span>\r\n<span class=\"k\">struct<\/span> <span class=\"n\">DecodingResult<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">ptr<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">len<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">width<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">height<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"nd\">#[no_mangle]<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">decode<\/span><span class=\"p\">(<\/span><span class=\"n\">ptr<\/span><span class=\"p\">:<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">u8<\/span><span class=\"p\">,<\/span> <span class=\"n\">len<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">c_char<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">buf<\/span><span class=\"p\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"p\">[<\/span><span class=\"nb\">u8<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"nn\">slice<\/span><span class=\"p\">::<\/span><span class=\"nf\">from_raw_parts_mut<\/span><span class=\"p\">(<\/span><span class=\"n\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"n\">len<\/span><span class=\"p\">)<\/span> <span class=\"p\">};<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">decoder<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">png<\/span><span class=\"p\">::<\/span><span class=\"nn\">Decoder<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"n\">buf<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"p\">(<\/span><span class=\"n\">info<\/span><span class=\"p\">,<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">reader<\/span><span class=\"p\">)<\/span> <span class=\"o\">=<\/span> <span class=\"k\">match<\/span> <span class=\"n\">decoder<\/span><span class=\"nf\">.read_info<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">Ok<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"n\">i<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"nf\">Err<\/span><span class=\"p\">(<\/span><span class=\"n\">why<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">panic!<\/span><span class=\"p\">(<\/span><span class=\"n\">why<\/span><span class=\"nf\">.to_string<\/span><span class=\"p\">()),<\/span>\r\n    <span class=\"p\">};<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">img_data<\/span> <span class=\"o\">=<\/span> <span class=\"nd\">vec!<\/span><span class=\"p\">[<\/span><span class=\"mi\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">info<\/span><span class=\"nf\">.buffer_size<\/span><span class=\"p\">()];<\/span>\r\n    <span class=\"n\">reader<\/span><span class=\"nf\">.next_frame<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"n\">img_data<\/span><span class=\"p\">)<\/span><span class=\"nf\">.unwrap<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">DecodingResult<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">ptr<\/span><span class=\"p\">:<\/span> <span class=\"n\">img_data<\/span><span class=\"nf\">.as_mut_ptr<\/span><span class=\"p\">()<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"n\">len<\/span><span class=\"p\">:<\/span> <span class=\"n\">info<\/span><span class=\"nf\">.buffer_size<\/span><span class=\"p\">()<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"n\">width<\/span><span class=\"p\">:<\/span> <span class=\"n\">info<\/span><span class=\"py\">.width<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"n\">height<\/span><span class=\"p\">:<\/span> <span class=\"n\">info<\/span><span class=\"py\">.height<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">};<\/span>\r\n    <span class=\"nn\">mem<\/span><span class=\"p\">::<\/span><span class=\"nf\">forget<\/span><span class=\"p\">(<\/span><span class=\"n\">img_data<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">res<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">serde_json<\/span><span class=\"p\">::<\/span><span class=\"nf\">to_string<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">result<\/span><span class=\"p\">)<\/span><span class=\"nf\">.unwrap<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">c_str<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">CString<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"n\">res<\/span><span class=\"p\">)<\/span><span class=\"nf\">.unwrap<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"n\">c_str<\/span><span class=\"nf\">.into_raw<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>JS\u5074<\/h3>\n<p>JSON\u3092\u30d1\u30fc\u30b9\u3057\u305f\u308a\u30dd\u30a4\u30f3\u30bf\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3057\u305f\u308a\u3057\u3066\u308b\u3060\u3051\u3067\u3059\u306d\u3002\u6ce8\u610f\u70b9\u306ffree\u3057\u5fd8\u308c\u306a\u3044\u3053\u3068\u3067\u3059\u306d\u3002JS\u66f8\u3044\u3066\u308b\u6c17\u5206\u3067\u3044\u308b\u3068\u629c\u3051\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"dl\">'<\/span><span class=\"s1\">use strict<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">fs<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">fs<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">wasm<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">fs<\/span><span class=\"p\">.<\/span><span class=\"nx\">readFileSync<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">.\/wasm\/main.wasm<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">mod<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">WebAssembly<\/span><span class=\"p\">.<\/span><span class=\"nx\">Instance<\/span><span class=\"p\">(<\/span><span class=\"k\">new<\/span> <span class=\"nx\">WebAssembly<\/span><span class=\"p\">.<\/span><span class=\"nx\">Module<\/span><span class=\"p\">(<\/span><span class=\"nx\">wasm<\/span><span class=\"p\">));<\/span>\r\n\r\n<span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">buf<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">heap<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Uint8Array<\/span><span class=\"p\">(<\/span><span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">memory<\/span><span class=\"p\">.<\/span><span class=\"nx\">buffer<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">ptr<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">alloc<\/span><span class=\"p\">(<\/span><span class=\"nx\">buf<\/span><span class=\"p\">.<\/span><span class=\"nx\">length<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nx\">heap<\/span><span class=\"p\">.<\/span><span class=\"kd\">set<\/span><span class=\"p\">(<\/span><span class=\"nx\">buf<\/span><span class=\"p\">,<\/span> <span class=\"nx\">ptr<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">resultPtr<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">decode<\/span><span class=\"p\">(<\/span><span class=\"nx\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">buf<\/span><span class=\"p\">.<\/span><span class=\"nx\">length<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">free<\/span><span class=\"p\">(<\/span><span class=\"nx\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">buf<\/span><span class=\"p\">.<\/span><span class=\"nx\">length<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">resultBuf<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Uint8Array<\/span><span class=\"p\">(<\/span><span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">memory<\/span><span class=\"p\">.<\/span><span class=\"nx\">buffer<\/span><span class=\"p\">,<\/span> <span class=\"nx\">resultPtr<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">getSize<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">buf<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"kd\">let<\/span> <span class=\"nx\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">while<\/span> <span class=\"p\">(<\/span><span class=\"nx\">buf<\/span><span class=\"p\">[<\/span><span class=\"nx\">i<\/span><span class=\"p\">]<\/span> <span class=\"o\">!==<\/span> <span class=\"mi\">0<\/span><span class=\"p\">)<\/span> <span class=\"nx\">i<\/span><span class=\"o\">++<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nx\">i<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">resultSize<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">getSize<\/span><span class=\"p\">(<\/span><span class=\"nx\">resultBuf<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">json<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">String<\/span><span class=\"p\">.<\/span><span class=\"nx\">fromCharCode<\/span><span class=\"p\">.<\/span><span class=\"nx\">apply<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">,<\/span> <span class=\"nx\">resultBuf<\/span><span class=\"p\">.<\/span><span class=\"nx\">slice<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"nx\">resultSize<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">free<\/span><span class=\"p\">(<\/span><span class=\"nx\">resultPtr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">resultSize<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">result<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">parse<\/span><span class=\"p\">(<\/span><span class=\"nx\">json<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">data<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Uint8Array<\/span><span class=\"p\">(<\/span><span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">len<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">target<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nb\">Uint8Array<\/span><span class=\"p\">(<\/span><span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">memory<\/span><span class=\"p\">.<\/span><span class=\"nx\">buffer<\/span><span class=\"p\">,<\/span> <span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">len<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"kd\">set<\/span><span class=\"p\">(<\/span><span class=\"nx\">target<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">ret<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">width<\/span><span class=\"p\">:<\/span> <span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">width<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">height<\/span><span class=\"p\">:<\/span> <span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">height<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">buf<\/span><span class=\"p\">:<\/span> <span class=\"nx\">data<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"nx\">mod<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span><span class=\"p\">.<\/span><span class=\"nx\">free<\/span><span class=\"p\">(<\/span><span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"nx\">result<\/span><span class=\"p\">.<\/span><span class=\"nx\">len<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nx\">ret<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u30b5\u30a4\u30ba<\/h3>\n<p>\u4eca\u56de\u30b5\u30f3\u30d7\u30eb\u306e\u6700\u7d42\u7684\u306a\u30b5\u30a4\u30ba\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u306a\u3093\u3060\u304b\u3093\u3060\u3001\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u306d\u3002\u3002\u3002\u304b\u306a\u3057\u3044\u3002<\/p>\n<div>\n<div class=\"post-table\">\u9805\u76ee\u30b5\u30a4\u30barust -&gt; wasm\u5f8c370KiBwasm-gc\u5f8c354KiBwasm-gc\u5f8c\u306bgzip73KiB<\/div>\n<\/div>\n<h3>\u30d9\u30f3\u30c1\u30de\u30fc\u30af<\/h3>\n<p>\u305d\u308c\u3067\u306f\u901f\u5ea6\u6bd4\u8f03\u3092\u884c\u3063\u3066\u307f\u307e\u3059\u3002<br \/>\n\u5bfe\u8c61\u3068\u306a\u308bpng\u306fpng crate\u306b\u542b\u307e\u308c\u3066\u3044\u305f\u30c6\u30b9\u30c8\u7528png\u304b\u308910\u679a\u9078\u629e\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u7d50\u679c\u306f\u4ee5\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code>## 0.png\r\nrust-png wasm x 10,912 ops\/sec \u00b10.87% (90 runs sampled)\r\npngjs x 2,882 ops\/sec \u00b11.30% (85 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 1.png\r\nrust-png wasm x 6,913 ops\/sec \u00b114.55% (62 runs sampled)\r\npngjs x 2,839 ops\/sec \u00b11.11% (89 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 2.png\r\nrust-png wasm x 12,349 ops\/sec \u00b11.83% (85 runs sampled)\r\npngjs x 2,839 ops\/sec \u00b11.42% (90 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 3.png\r\nrust-png wasm x 8,360 ops\/sec \u00b10.84% (90 runs sampled)\r\npngjs x 2,801 ops\/sec \u00b11.61% (88 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 4.png\r\nrust-png wasm x 8,407 ops\/sec \u00b11.08% (92 runs sampled)\r\npngjs x 6,935 ops\/sec \u00b12.71% (85 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 5.png\r\nrust-png wasm x 5,732 ops\/sec \u00b11.49% (91 runs sampled)\r\npngjs x 2,414 ops\/sec \u00b11.14% (90 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 6.png\r\nrust-png wasm x 6,643 ops\/sec \u00b11.01% (91 runs sampled)\r\npngjs x 7,138 ops\/sec \u00b12.16% (80 runs sampled)\r\nFastest is pngjs\r\n\r\n## 7.png\r\nrust-png wasm x 2,220 ops\/sec \u00b10.88% (90 runs sampled)\r\npngjs x 1,957 ops\/sec \u00b11.28% (89 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 8.png\r\nrust-png wasm x 11,944 ops\/sec \u00b11.01% (91 runs sampled)\r\npngjs x 2,929 ops\/sec \u00b11.12% (90 runs sampled)\r\nFastest is rust-png wasm\r\n\r\n## 9.png\r\nrust-png wasm x 5,229 ops\/sec \u00b10.92% (87 runs sampled)\r\npngjs x 10,119 ops\/sec \u00b11.12% (92 runs sampled)\r\nFastest is pngjs\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d5e2937434c4406cf4619\/43-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2017-12-04 20.39.42.png\" \/><\/div>\n<p>\uff0a\u30ad\u30e3\u30d7\u30c1\u30e3\u3060\u3068\u5358\u4f4d\u7b49\u3044\u308d\u3044\u308d\u306c\u3051\u3066\u3044\u308b\u306e\u3067\u4e0b\u8a18\u30ea\u30f3\u30af\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044<br \/>\nhttps:\/\/bokuweb.github.io\/rust-wasm-png-decoder-example\/index.html<\/p>\n<p>wasm\u306e\u65b9\u304c\u9ad8\u901f\u3067\u3088\u304b\u3063\u305f\u3067\u3059\u306d\u30fc\u3002\u3068\u7d42\u308f\u308a\u305f\u304b\u3063\u305f\u3093\u3067\u3059\u304c\u3001JS\u7248\u304cwasm\u7248\u3088\u308a\u500d\u8fd1\u304f\u901f\u3044\u30b1\u30fc\u30b9\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002(9.png)\u3002\u50c5\u5dee\u3067\uff2a\uff33\u306e\u65b9\u304c\u901f\u3044\uff086.png\u306e\u3088\u3046\u306a\uff09\u30b1\u30fc\u30b9\u306f\u767a\u751f\u3057\u3046\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3063\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u306a\u305c\u3053\u308c\u307b\u3069\u306e\u5dee\u304c\u767a\u751f\u3059\u308b\u306e\u304b\u306f\u5206\u304b\u3063\u3066\u304a\u3089\u305a\u3001\u8981\u8abf\u67fb\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>wasm32-unknown-unknown\u3067emscripten\u306a\u3057\u306bnode_module\u3092\u4f5c\u88fd\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u30b0\u30eb\u30fc\u30b3\u30fc\u30c9\u3092\u81ea\u8eab\u3067\u7528\u610f\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u3059\u304c\u3001emscripten\u5206\u306e\u5bb9\u91cf\u3092\u524a\u6e1b\u3067\u304d\u305f\u308a\u3001emscripten\u306e\u53e4\u3044node\u306b\u82e6\u3057\u3081\u3089\u308c\u308b\u3053\u3068\u3082\u306a\u304f\u306a\u308b\u306e\u3067\u53ef\u80fd\u306a\u9650\u308a\u3053\u3061\u3089\u3092\u4f7f\u7528\u3057\u305f\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>\u901f\u5ea6\u306b\u95a2\u3057\u3066\u306f\u3001\u300cwasm\u306e\u65b9\u304c\u901f\u3044\u3088\u30fc\u300d\u3068\u306f\u73fe\u6642\u70b9\u3067\u306f\u8a00\u3046\u3053\u3068\u304c\u3067\u304d\u306a\u305d\u3046\u3067\u3001\u8981\u8abf\u67fb\u3002<\/p>\n<p>\u307e\u305f\u3001\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u4ee5\u4e0b\u3067\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>npm i https:\/\/github.com\/bokuweb\/rust-wasm-png-decoder-example\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">fs<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">fs<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">decode<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">wasm-png-decoder<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">decode<\/span><span class=\"p\">(<\/span><span class=\"nx\">fs<\/span><span class=\"p\">.<\/span><span class=\"nx\">readFileSync<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge.png<\/span><span class=\"dl\">'<\/span><span class=\"p\">)));<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u306f\u300cWACUL Advent Calendar 2017\u300d\u306e5\u65e5\u76ee\u3067\u3059\u3002 WACUL\u3067\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u30a8 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45346","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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