From a6d5c9f67102ac8f12941841ad4871b012c044d8 Mon Sep 17 00:00:00 2001
From: Joscha <joscha@plugh.de>
Date: Sat, 22 Feb 2025 21:54:54 +0100
Subject: [PATCH] Add image scale option

---
 showbits-common/src/widgets/image.rs         | 19 ++++++++++++++++---
 showbits-thermal-printer/src/drawer/image.rs |  2 ++
 showbits-thermal-printer/src/server.rs       |  5 +++++
 showbits-thermal-printer/static/image.html   |  4 ++++
 4 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/showbits-common/src/widgets/image.rs b/showbits-common/src/widgets/image.rs
index b347810..b1cfd36 100644
--- a/showbits-common/src/widgets/image.rs
+++ b/showbits-common/src/widgets/image.rs
@@ -29,6 +29,7 @@ pub struct Image {
     image: RgbaImage,
     shrink: bool,
     grow: bool,
+    scale: u32,
     filter: FilterType,
 
     dither_palette: Option<Palette<LinSrgb>>,
@@ -42,6 +43,7 @@ impl Image {
             shrink: true,
             grow: false,
             filter: FilterType::CatmullRom,
+            scale: 1,
             dither_palette: None,
             dither_algorithm: DitherAlgorithm::FloydSteinberg,
         }
@@ -57,6 +59,11 @@ impl Image {
         self
     }
 
+    pub fn with_scale(mut self, scale: u32) -> Self {
+        self.scale = scale.max(1);
+        self
+    }
+
     pub fn with_filter(mut self, filter: FilterType) -> Self {
         self.filter = filter;
         self
@@ -94,8 +101,8 @@ impl<C> Widget<C> for Image {
         }
 
         let size = Size {
-            width: self.image.width() as f32,
-            height: self.image.height() as f32,
+            width: (self.image.width() * self.scale) as f32,
+            height: (self.image.height() * self.scale) as f32,
         };
 
         let max_width = known.width.or(match available.width {
@@ -134,7 +141,11 @@ impl<C> Widget<C> for Image {
         _layout: &Layout,
     ) -> anyhow::Result<()> {
         let (width, height) = view.size().to_u32();
-        let image = imageops::resize(&self.image, width, height, self.filter);
+
+        let iwidth = width / self.scale;
+        let iheight = height / self.scale;
+
+        let image = imageops::resize(&self.image, iwidth, iheight, self.filter);
 
         let image = if let Some(palette) = &self.dither_palette {
             self.dither_algorithm.dither(image, palette)
@@ -142,6 +153,8 @@ impl<C> Widget<C> for Image {
             image
         };
 
+        let image = imageops::resize(&image, width, height, FilterType::Nearest);
+
         view.image(&image);
         Ok(())
     }
diff --git a/showbits-thermal-printer/src/drawer/image.rs b/showbits-thermal-printer/src/drawer/image.rs
index a8d27ef..8064b57 100644
--- a/showbits-thermal-printer/src/drawer/image.rs
+++ b/showbits-thermal-printer/src/drawer/image.rs
@@ -15,6 +15,7 @@ pub struct ImageDrawing {
     pub image: RgbaImage,
     pub bright: bool,
     pub algo: DitherAlgorithm,
+    pub scale: u32,
 }
 
 impl Drawing for ImageDrawing {
@@ -33,6 +34,7 @@ impl Drawing for ImageDrawing {
         let image = Image::new(image)
             .with_dither_palette(&[BLACK, WHITE])
             .with_dither_algorithm(self.algo)
+            .with_scale(self.scale)
             .node()
             .register(&mut tree)?;
 
diff --git a/showbits-thermal-printer/src/server.rs b/showbits-thermal-printer/src/server.rs
index 2518cb1..2e74c47 100644
--- a/showbits-thermal-printer/src/server.rs
+++ b/showbits-thermal-printer/src/server.rs
@@ -114,6 +114,7 @@ async fn post_image(server: State<Server>, mut multipart: Multipart) -> somehow:
     let mut image = None;
     let mut bright = false;
     let mut algo = DitherAlgorithm::FloydSteinberg;
+    let mut scale = 1_u32;
 
     while let Some(field) = multipart.next_field().await? {
         match field.name() {
@@ -130,6 +131,9 @@ async fn post_image(server: State<Server>, mut multipart: Multipart) -> somehow:
                 "stucki" => algo = DitherAlgorithm::Stucki,
                 _ => {}
             },
+            Some("scale") => {
+                scale = field.text().await?.parse::<u32>()?;
+            }
             _ => {}
         }
     }
@@ -144,6 +148,7 @@ async fn post_image(server: State<Server>, mut multipart: Multipart) -> somehow:
             image,
             bright,
             algo,
+            scale,
         }))
         .await;
     Ok(Redirect::to("image").into_response())
diff --git a/showbits-thermal-printer/static/image.html b/showbits-thermal-printer/static/image.html
index f7b919f..e1e16a7 100644
--- a/showbits-thermal-printer/static/image.html
+++ b/showbits-thermal-printer/static/image.html
@@ -20,6 +20,10 @@
             <option value="stucki">Stucki</option>
           </select>
         </li>
+        <li>
+          Scale:
+          <input name="scale" type="number" min="1" max="8" value="1" />
+        </li>
         <li><button>Print!</button></li>
       </ol>
     </form>