annnd we have our character rom!!!

src/main.rs

@@ -1,5 +1,10 @@
 #![allow(clippy::println_empty_string)]
-use std::{fs::File, io, path::PathBuf, u8};
+use std::{
+    fs::File,
+    io::{self, Write},
+    path::PathBuf,
+    u8,
+};
 
 extern crate png;
 
@@ -26,26 +31,39 @@ fn to_bitmap(path: &str, max_chars: u16, max_rows: usize) -> Result<Vec<u8>, io:
     Ok(finalbuf)
 }
 
-fn reorder_bitmap(bitmap: Vec<u8>) -> Vec<u8> {
-    unimplemented!()
+fn reorder_bitmap(bitmap: &[u8]) -> Vec<u8> {
+    let mut reordered: Vec<u8> = Vec::new();
+    for row in 0..MAX_ROWS {
+        for character in 0x00..MAX_CHARS {
+            let mut byte = 0u8;
+            for i in 0..8 {
+                // character number + row offset & bitmask = pixel
+                if bitmap[character as usize + (row * 0xFF)] & 0x80 >> i > 0 {
+                    byte |= 0x80 >> i;
+                }
+            }
+            reordered.push(byte);
+        }
+    }
+    reordered
 }
 
 fn main() -> std::io::Result<()> {
     let compressed = to_bitmap("./cozette.png", MAX_CHARS, MAX_ROWS)?;
-    for row in 0..MAX_ROWS {
-        for character in 0x00..MAX_CHARS {
-            print!("{:#04x}, {} ", character, row); // character as usize * row);
-            print!("{:#04x}: ", compressed[character as usize + (row * 0xFF)]);
-            for i in 0..8 {
-                // character number * char width + pixel offset + row offset = pixel
-                if compressed[character as usize + (row * 0xFF)] & 0x80 >> i > 0 {
-                    print!("█");
-                } else {
-                    print!(" ");
-                }
-            }
-            println!("");
-        }
-    }
+    let reordered = reorder_bitmap(&compressed);
+    let mut outfile = File::create("./cozette.bin")?;
+    outfile.set_len(0xFFFF)?;
+    outfile.write_all(&reordered)?;
+    //for byte in reordered.iter() {
+    //    for i in 0..8 {
+    //        // character number + row offset & bitmask = pixel
+    //        if byte & 0x80 >> i > 0 {
+    //            print!("█");
+    //        } else {
+    //            print!(" ");
+    //        }
+    //    }
+    //    println!("");
+    //}
     Ok(())
 }