build: add some pixmaps for the oled UI, and generated rust code at build time

build.rs

@@ -1,7 +1,59 @@
+use std::fs;
+use std::io::Write;
+use std::path::Path;
+use std::fs::File;
+use image::GenericImageView;
+
 fn main() {
     linker_be_nice();
     // make sure linkall.x is the last linker script (otherwise might cause problems with flip-link)
     println!("cargo:rustc-link-arg=-Tlinkall.x");
+
+    let asset_path = Path::new("assets");
+
+    let mut image_output = File::create(Path::new("target/images.rs")).unwrap();
+    for image in fs::read_dir(asset_path).unwrap() {
+        let fname = image.unwrap().file_name();
+        let fname_str = fname.to_str().unwrap();
+        if fname_str.ends_with(".pbm") {
+            let img = image::open(asset_path.join(fname_str)).unwrap();
+            let img_name = fname_str.rsplit_once('.').unwrap().0.to_uppercase().replace("-", "_");
+
+            let mut converted_row = Vec::new();
+            let mut byte_buf = String::new();
+            image_output.write_all(format!("pub const {img_name}: ImageRaw<BinaryColor> = ImageRaw::new(&[\n").as_bytes()).unwrap();
+            for (x, _, pixel) in img.pixels() {
+                if pixel.0 == [0, 0, 0, 255] {
+                    byte_buf.push('1');
+                } else {
+                    byte_buf.push('0');
+                }
+                if byte_buf.len() == 8 {
+                    converted_row.push(byte_buf);
+                    byte_buf = String::new();
+                }
+                if x == img.width() - 1 {
+                    if !byte_buf.is_empty() {
+                        byte_buf.push('_');
+                        for _ in 0..(9 - byte_buf.len()) {
+                            byte_buf.push('0');
+                        }
+                        converted_row.push(byte_buf);
+                        byte_buf = String::new();
+                    }
+                    image_output.write_all(b"    ").unwrap();
+                    for pix in converted_row.iter() {
+                        image_output.write_all(format!("0b{pix}, ").as_bytes()).unwrap();
+                    }
+                    image_output.write_all(b"\n").unwrap();
+                    converted_row = Vec::new();
+                }
+            }
+
+            image_output.write_all(format!("], {});\n", img.width()).as_bytes()).unwrap();
+            println!("cargo::rerun-if-changed={fname_str}");
+        }
+    }
 }
 
 fn linker_be_nice() {