wasm

src/wasm/mod.rs

@@ -0,0 +1,51 @@
+use crate::descriptors::DCT;
+extern crate wasm_bindgen;
+use wasm_bindgen::prelude::*;
+use std::io::Cursor;
+use console_error_panic_hook;
+
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn greet() {
+    alert("Hello world!");
+}
+
+#[wasm_bindgen]
+pub fn dctify(bytes: Vec<u8>) -> Vec<f64> {
+	console_error_panic_hook::set_once();
+	let reader = 
+		image::io::Reader
+		::new(Cursor::new(bytes)).with_guessed_format().unwrap();
+	let img: image::DynamicImage = 
+		reader
+		.decode()
+		.unwrap();
+	let dct = DCT::new();
+	let values = dct.dct(&img);
+	Vec::from(values)
+}
+
+#[wasm_bindgen]
+pub fn resize(bytes: Vec<u8>) -> Vec<u8> {
+	console_error_panic_hook::set_once();
+	let reader = 
+		image::io::Reader
+		::new(Cursor::new(bytes)).with_guessed_format().unwrap();
+
+	let img: image::DynamicImage = 
+		reader
+		.decode()
+		.unwrap();
+
+	let resized = img.grayscale().thumbnail_exact(8, 8);
+	let mut buffer: Vec<u8> = Vec::new();
+	let mut writer = std::io::Cursor::new(&mut buffer);
+
+	resized.write_to(&mut writer, image::ImageFormat::Png).unwrap();
+
+	buffer
+}