added autodetect tape size

brother_ql/src/driver.rs

@@ -119,6 +119,50 @@ pub struct PrinterStatus {
     phase_state: PhaseState,
 }
 
+impl PrinterStatus {
+    /// Get the pixel width (print area width in dots) for the loaded media
+    pub fn pixel_width(&self) -> Option<u16> {
+        match (self.media_width, self.media_length) {
+            // Endless tapes (length = 0) - dots_total - offset_r
+            (12, 0) => Some(142 - 29),   // 113
+            (18, 0) => Some(256 - 171),  // 85
+            (29, 0) => Some(342 - 6),    // 336
+            (38, 0) => Some(449 - 12),   // 437
+            (50, 0) => Some(590 - 12),   // 578
+            (54, 0) => Some(636 - 0),    // 636
+            (62, 0) => Some(732 - 12),   // 720
+            (102, 0) => Some(1200 - 12), // 1188
+            (104, 0) => Some(1224 - 12), // 1212
+
+            // Die-cut labels
+            (17, 54) => Some(201 - 0),     // 201
+            (17, 87) => Some(201 - 0),     // 201
+            (23, 23) => Some(272 - 42),    // 230
+            (29, 42) => Some(342 - 6),     // 336
+            (29, 90) => Some(342 - 6),     // 336
+            (38, 90) => Some(449 - 12),    // 437
+            (39, 48) => Some(461 - 6),     // 455
+            (52, 29) => Some(614 - 0),     // 614
+            (54, 29) => Some(630 - 60),    // 570
+            (60, 87) => Some(708 - 18),    // 690
+            (62, 29) => Some(732 - 12),    // 720
+            (62, 100) => Some(732 - 12),   // 720
+            (102, 51) => Some(1200 - 12),  // 1188
+            (102, 153) => Some(1200 - 12), // 1188
+            (104, 164) => Some(1224 - 12), // 1212
+
+            // Round die-cut labels
+            // This can't be right
+            //(12, 12) => Some(142 - 113), // 29
+            (24, 24) => Some(284 - 42),  // 242
+            (58, 58) => Some(688 - 51),  // 637
+
+            // Unknown media
+            _ => None,
+        }
+    }
+}
+
 #[derive(Clone)]
 pub enum PrinterCommandMode {
     /// ESC/P mode (normal)
@@ -255,6 +299,7 @@ impl PrinterCommander {
     }
 
     pub fn read_status(&mut self) -> Result<PrinterStatus, std::io::Error> {
+        self.send_command(PrinterCommand::StatusInfoRequest)?;
         let res = self.printer.read(32)?;
         assert!(res[0] == 0x80);
         assert!(res[1] == 0x20);

brother_ql/src/image.rs

@@ -1,3 +1,5 @@
+use std::env;
+
 use crate::driver::{PrinterCommand, PrinterCommandMode, PrinterExpandedMode, PrinterMode};
 use crate::error::BrotherQlError;
 use crate::{driver, Settings};
@@ -58,7 +60,10 @@ fn apply_threshold(
     Ok(img)
 }
 
-fn img_to_lines(img: ImageBuffer<Rgba<u8>, Vec<u8>>) -> Result<Vec<[u8; 90]>, BrotherQlError> {
+fn img_to_lines(
+    img: ImageBuffer<Rgba<u8>, Vec<u8>>,
+    image_width: u32,
+) -> Result<Vec<[u8; 90]>, BrotherQlError> {
     // convert to vec of line bits
     /*
         let mut lines = Vec::new();
@@ -83,13 +88,14 @@ fn img_to_lines(img: ImageBuffer<Rgba<u8>, Vec<u8>>) -> Result<Vec<[u8; 90]>, Br
     */
 
     let mut lines = Vec::new();
+    let padding = 720 - image_width;
 
     for y in 0..img.height() {
         let mut line = [0u8; 90];
 
         for x in 0..img.width() {
             let i = img.get_pixel(x, y).0[0];
-
+            let x = x + padding;
             let byte = x / 8;
             let bit = x % 8;
 
@@ -133,8 +139,10 @@ pub fn render_image(file_path: &str, settings: &Settings) -> Result<Vec<[u8; 90]
 
     // resize
 
-    let new_width = 720; //630 per la carta piccola
-
+    // let new_width = 720; //630 per la carta piccola
+    let mut printer = driver::PrinterCommander::main("/dev/usb/lp0")?;
+    let status = printer.read_status()?;
+    let new_width = status.pixel_width().unwrap_or(720) as u32;
     let new_height = new_width * img.height() / img.width() * if settings.dpi_600 { 2 } else { 1 };
 
     let mut img = image::imageops::resize(
@@ -152,7 +160,8 @@ pub fn render_image(file_path: &str, settings: &Settings) -> Result<Vec<[u8; 90]
 
     dithered_img.save("/tmp/out_processed.png")?;
 
-    let lines = img_to_lines(dithered_img)?;
+    // if the paper format is not known, assume the biggest one
+    let lines = img_to_lines(dithered_img, new_width)?;
     Ok(lines)
 }
 

example.env

@@ -1,3 +1,3 @@
 BOT_TOKEN=999999999:xxxxxxxxxxxxxxx-xxxxxxxxxxxxxxxxxx
 OWNER_ID=222222222
-RUST_LOG=printer_bot_rs=DEBUG
+RUST_LOG=printer_bot_rs=DEBUG

printer_bot_rs/Cargo.toml

@@ -11,3 +11,4 @@ log = "0.4.20"
 teloxide-core = "0.13"
 thiserror = "2.0.16"
 tokio = { version = "1.34.0", features = ["full"] }
+openssl = { version = "0.10", features = ["vendored"] }