good god that took way to long but this kinda works

src/main.rs

@@ -1,66 +1,44 @@
-#![allow(dead_code, clippy::println_empty_string)]
-use std::{
-    fs::File,
-    ops::{Add, AddAssign},
-};
+#![allow(clippy::println_empty_string)]
+use std::{fs::File, io, path::PathBuf, u8};
 
 extern crate png;
 
-extern crate bdf;
-const ADDRESS_SIZE: usize = 13;
-const ROW_BITS: usize = 5;
-const CHAR_BITS: usize = 8;
-
 const MAX_ROWS: usize = 13;
-const MAX_CHARS: u8 = 0xFF;
+const MAX_CHARS: u16 = 0x100; // Non inclusive, first char is 0x00
 
-struct CharRowAddress {
-    row_address: u8,
-    char_address: u8,
+fn to_bitmap(path: &str, max_chars: u16, max_rows: usize) -> Result<Vec<u8>, io::Error> {
+    let decoder = png::Decoder::new(File::open(path)?);
+    let mut reader = decoder.read_info()?;
+    let mut buf = vec![0; reader.output_buffer_size()];
+    let info = reader.next_frame(&mut buf)?;
+    let bytes = &buf[..info.buffer_size()];
+    let compressed: Vec<u8> = bytes.iter().step_by(4).cloned().collect(); // We're not using color, so we skip duplicate color components
+    let mut finalbuf = Vec::new();
+    for (i, _bit) in compressed.iter().step_by(8).enumerate() {
+        let mut byte = 0u8;
+        for j in (0..8).rev() {
+            if compressed[i * 8 + j] == 255 {
+                byte |= 0x80 >> j;
+            }
+        }
+        finalbuf.push(byte);
+    }
+    Ok(finalbuf)
 }
 
-impl CharRowAddress {
-    fn new() -> Self {
-        Self {
-            row_address: 0x00,
-            char_address: 0x00,
-        }
-    }
-    fn inc_row(&mut self) {
-        if self.row_address.add(0x01) > 0b0001_1111 {
-        } else {
-            self.row_address.add_assign(0x01);
-        }
-    }
-    fn inc_char(&mut self) {
-        if self.char_address.add(0x01) > 0b0111_1111 {
-        } else {
-            self.char_address.add_assign(0x01);
-        }
-    }
-}
-
-impl std::fmt::Display for CharRowAddress {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:05b}{:07b}", self.row_address, self.char_address)
-    }
+fn reorder_bitmap(bitmap: Vec<u8>) -> Vec<u8> {
+    unimplemented!()
 }
 
 fn main() -> std::io::Result<()> {
-    let decoder = png::Decoder::new(File::open("./cozette.png").unwrap());
-    let mut reader = decoder.read_info().unwrap();
-    let mut buf = vec![0; reader.output_buffer_size()];
-    let info = reader.next_frame(&mut buf).unwrap();
-    let bytes = &buf[..info.buffer_size()];
-    let compressed: Vec<u8> = bytes.iter().step_by(4).cloned().collect();
-    let mut address = CharRowAddress::new();
+    let compressed = to_bitmap("./cozette.png", MAX_CHARS, MAX_ROWS)?;
     for row in 0..MAX_ROWS {
-        address.inc_row();
-        for character in 0x00..0x7F {
-            address.inc_char();
-            print!("{}	", character as usize * row);
-            for i in 0..7 {
-                if compressed[character as usize * 7 + i + (row * 0x7f)] == 255 {
+        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!(" ");