Merge upstream develop

Author: github-actions[bot]

packages/rs-core/Cargo.toml

@@ -17,6 +17,7 @@ rand = "0.8"
 polycentric-common = { path = "../rs-common" }
 getrandom = { version = "0.2", features = ["js"] }
 sha2 = "0.10"
+image = "0.25.10"
 
 # FFI
 libc = { version = "0.2.172", optional = true }

packages/rs-core/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod client;
 pub mod event;
+pub mod media;
 pub mod platform;
 pub mod store;

packages/rs-core/src/media/mod.rs

@@ -0,0 +1 @@
+pub mod process_image;

packages/rs-core/src/media/process_image.rs

@@ -0,0 +1,18 @@
+use image::codecs::jpeg::JpegEncoder;
+use image::imageops::FilterType;
+use image::{ImageError, ImageReader};
+use std::io::Cursor;
+
+const JPEG_QUALITY: u8 = 95;
+
+pub fn process_image(image: &[u8], width: u32, height: u32) -> Result<Vec<u8>, ImageError> {
+    let src = ImageReader::new(Cursor::new(image))
+        .with_guessed_format()
+        .unwrap();
+    let img = src.decode()?;
+    let resized = img.resize_to_fill(width, height, FilterType::Lanczos3);
+    let mut buf: Vec<u8> = Vec::new();
+    let encoder = JpegEncoder::new_with_quality(&mut buf, JPEG_QUALITY);
+    resized.write_with_encoder(encoder)?;
+    Ok(buf)
+}

packages/rs-core/src/platform/wasm.rs

@@ -384,6 +384,20 @@ impl PolycentricWasm {
 
         Ok(Uint8Array::from(&response.encode_to_vec()[..]))
     }
+
+    /// Decode `image` bytes, resize to fill `width` x `height` preserving
+    /// aspect ratio (center-cropped), and encode as JPEG.
+    #[wasm_bindgen]
+    pub fn process_image_to_jpeg(
+        &self,
+        image: &[u8],
+        width: u32,
+        height: u32,
+    ) -> std::result::Result<Uint8Array, JsValue> {
+        let jpeg = crate::media::process_image::process_image(image, width, height)
+            .map_err(|e| JsValue::from_str(&format!("process_image failed: {e}")))?;
+        Ok(Uint8Array::from(&jpeg[..]))
+    }
 }
 
 impl PolycentricWasm {