restore previous image.rs example as reference

crates/desktop/src-tauri/src/flip_image.rs

@@ -0,0 +1,36 @@
+use base64::prelude::BASE64_STANDARD;
+use base64::Engine;
+use image::codecs::png::{CompressionType, FilterType, PngEncoder};
+use image::ImageReader;
+use std::io::Cursor;
+
+#[tauri::command]
+pub fn flip_image(image: &str) -> Result<String, String> {
+  println!("infer_image called; processing image...");
+
+  let bytes = BASE64_STANDARD.decode(image)
+    .map_err(|err| format!("Base64 decode error: {}", err))?;
+
+  let image = ImageReader::new(Cursor::new(bytes))
+    .with_guessed_format()
+    .map_err(|err| format!("Image format error: {}", err))?
+    .decode()
+    .map_err(|err| format!("Image decode error: {}", err))?;
+
+  let rotated_image = image.rotate180();
+
+  let mut buffer = Vec::new(); // TODO: Preallocate, better data structure
+  let mut writer = Cursor::new(&mut buffer);
+
+  let encoder = PngEncoder::new_with_quality
+    (&mut writer, CompressionType::Fast, FilterType::Adaptive);
+  
+  rotated_image.write_with_encoder(encoder)
+    .map_err(|err| format!("Image encoding error: {}", err))?;
+
+  let encoded = BASE64_STANDARD.encode(&buffer);
+
+  println!("Encoded: {:?}", encoded.split_at(10).0);
+
+  Ok(encoded)
+}

crates/desktop/src-tauri/src/lib.rs

@@ -1,3 +1,4 @@
+mod flip_image;
 mod image_endpoint;
 mod sd;