Add option to export original images

meta/dev-thermal-printer

@@ -1,14 +1,15 @@
 #!/usr/bin/env fish
 
-argparse h/help p/print r/release -- $argv
+argparse h/help p/print o/originals r/release -- $argv
 and not set -ql _flag_help
 or begin
     echo "Usage:" (status filename) "[OPTIONS]"
     echo
     echo "Options:"
-    echo "  -h, --help      Show this help"
-    echo "  -p, --print     Attach to printer at /dev/usb/lp0"
-    echo "  -r, --release   Use 'cargo run --release'"
+    echo "  -h, --help       Show this help"
+    echo "  -p, --print      Attach to printer at /dev/usb/lp0"
+    echo "  -o, --originals  Export original images"
+    echo "  -r, --release    Use 'cargo run --release'"
     return
 end
 
@@ -22,6 +23,11 @@ if set -ql _flag_print
     set arg_print -p /dev/usb/lp0
 end
 
+set -l arg_originals
+if set -ql _flag_originals
+    set arg_originals -o target/originals
+end
+
 cargo run $arg_release \
     --package showbits-thermal-printer \
-    -- target/queue -e target/image.png $arg_print
+    -- target/queue -e target/image.png $arg_print $arg_originals

meta/spinch/showbits-thermal-printer.service

@@ -4,6 +4,7 @@ Description=Showbits Thermal Printer
 [Service]
 Type=simple
 ExecStart=/home/bondrucker/showbits-thermal-printer queue -a 0.0.0.0:8001 -p /dev/usb/lp0
+# ExecStart=/home/bondrucker/showbits-thermal-printer queue -a 0.0.0.0:8001 -p /dev/usb/lp0 -o originals
 Restart=on-failure
 
 User=bondrucker

showbits-thermal-printer/src/documents/image/mod.rs

@@ -1,4 +1,4 @@
-use std::io::Cursor;
+use std::{fs, io::Cursor};
 
 use anyhow::{Context, anyhow, bail};
 use axum::{
@@ -10,6 +10,7 @@ use image::{
     DynamicImage, EncodableLayout, ImageDecoder, ImageFormat, ImageReader, Luma, Pixel, RgbaImage,
     imageops,
 };
+use jiff::Timestamp;
 use mark::dither::{AlgoFloydSteinberg, AlgoStucki, Algorithm, DiffEuclid, Palette};
 use palette::LinSrgb;
 use serde::Serialize;
@@ -101,17 +102,7 @@ pub async fn post(server: State<Server>, mut multipart: Multipart) -> somehow::R
     while let Some(field) = multipart.next_field().await? {
         match field.name() {
             Some("image") => {
-                let data = field.bytes().await?;
-
-                // https://github.com/image-rs/image/issues/2392#issuecomment-2547393362
-                let mut decoder = ImageReader::new(Cursor::new(data.as_bytes()))
-                    .with_guessed_format()?
-                    .into_decoder()?;
-                let orientation = decoder.orientation()?;
-                let mut decoded = DynamicImage::from_decoder(decoder)?;
-                decoded.apply_orientation(orientation);
-
-                image = Some(decoded.to_rgba8());
+                image = Some(field.bytes().await?);
             }
             Some("title") => {
                 data.title = Some(field.text().await?).filter(|it| !it.is_empty());
@@ -139,10 +130,31 @@ pub async fn post(server: State<Server>, mut multipart: Multipart) -> somehow::R
         return Ok(status_code(StatusCode::UNPROCESSABLE_ENTITY));
     };
 
+    // Export original image if requested
+    if let Some(dir) = &server.originals {
+        fs::create_dir_all(dir)?;
+        let path = dir.join(Timestamp::now().as_millisecond().to_string());
+        fs::write(path, &image)?;
+    }
+
+    // Decode image data
+    let image = {
+        // https://github.com/image-rs/image/issues/2392#issuecomment-2547393362
+        let mut decoder = ImageReader::new(Cursor::new(image.as_bytes()))
+            .with_guessed_format()?
+            .into_decoder()?;
+        let orientation = decoder.orientation()?;
+        let mut decoded = DynamicImage::from_decoder(decoder)?;
+        decoded.apply_orientation(orientation);
+        decoded.to_rgba8()
+    };
+
+    // Dither image
     let max_width = Some(384);
     let max_height = Some(1024);
     let image = dither(image, max_width, max_height, bright, &algo).map_err(somehow::Error)?;
 
+    // Encode dithered image for typst
     let mut bytes: Vec<u8> = Vec::new();
     image
         .write_to(&mut Cursor::new(&mut bytes), ImageFormat::Png)

showbits-thermal-printer/src/main.rs

@@ -33,6 +33,11 @@ struct Args {
     /// Export an image of whatever is printed here.
     #[arg(long, short)]
     export: Option<PathBuf>,
+
+    /// Export the original images printed by the image document, before
+    /// dithering or other manipulation.
+    #[arg(long, short)]
+    originals: Option<PathBuf>,
 }
 
 fn main() -> anyhow::Result<()> {
@@ -44,7 +49,7 @@ fn main() -> anyhow::Result<()> {
     let mut drawer = Drawer::new(rx, printer);
 
     let runtime = Runtime::new()?;
-    runtime.spawn(server::run(tx.clone(), args.address));
+    runtime.spawn(server::run(tx.clone(), args.address, args.originals));
     runtime.spawn(async move {
         loop {
             let _ = tx.send(Command::Backlog).await;

showbits-thermal-printer/src/server.rs

@@ -2,6 +2,8 @@ pub mod somehow;
 mod r#static;
 pub mod statuscode;
 
+use std::path::PathBuf;
+
 use axum::{
     Router,
     extract::DefaultBodyLimit,
@@ -18,6 +20,7 @@ use crate::{documents, drawer::Command};
 #[derive(Clone)]
 pub struct Server {
     tx: mpsc::Sender<Command>,
+    pub originals: Option<PathBuf>,
 }
 
 impl Server {
@@ -28,7 +31,11 @@ impl Server {
     }
 }
 
-pub async fn run(tx: mpsc::Sender<Command>, addr: String) -> anyhow::Result<()> {
+pub async fn run(
+    tx: mpsc::Sender<Command>,
+    addr: String,
+    originals: Option<PathBuf>,
+) -> anyhow::Result<()> {
     let app = Router::new()
         // Files
         .route("/", get(r#static::get_index))
@@ -47,7 +54,7 @@ pub async fn run(tx: mpsc::Sender<Command>, addr: String) -> anyhow::Result<()>
         .route("/api/xkcd", post(documents::xkcd::post))
         // Rest
         .layer(DefaultBodyLimit::max(32 * 1024 * 1024)) // 32 MiB
-        .with_state(Server { tx });
+        .with_state(Server { tx, originals });
 
     let listener = TcpListener::bind(addr).await?;
     axum::serve(listener, app).await?;