First working commit

Cargo.toml

@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 crossterm = "0.29.0"
+image = "0.25.6"

src/main.rs

@@ -1,37 +1,61 @@
 use crossterm::terminal::size;
-const BRAILLE: [[&str; 16]; 4] = [
-    [
-        // U+280x
-        "⠀", "⠁", "⠂", "⠃", "⠄", "⠅", "⠆", "⠇", "⠈", "⠉", "⠊", "⠋", "⠌", "⠍", "⠎", "⠏",
-    ],
-    [
-        // U+281x
-        "⠐", "⠑", "⠒", "⠓", "⠔", "⠕", "⠖", "⠗", "⠘", "⠙", "⠚", "⠛", "⠜", "⠝", "⠞", "⠟",
-    ],
-    [
-        // U+282x
-        "⠠", "⠡", "⠢", "⠣", "⠤", "⠥", "⠦", "⠧", "⠨", "⠩", "⠪", "⠫", "⠬", "⠭", "⠮", "⠯",
-    ],
-    [
-        // U+283x
-        "⠰", "⠱", "⠲", "⠳", "⠴", "⠵", "⠶", "⠷", "⠸", "⠹", "⠺", "⠻", "⠼", "⠽", "⠾", "⠿",
-    ],
+use image::{imageops::FilterType::Lanczos3, DynamicImage, ImageReader};
+use std::env;
+
+const BRAILLE: [&str; 64] = [
+    "⠀", "⠁", "⠂", "⠃", "⠄", "⠅", "⠆", "⠇", "⠈", "⠉", "⠊", "⠋", "⠌", "⠍", "⠎", "⠏", "⠐", "⠑", "⠒",
+    "⠓", "⠔", "⠕", "⠖", "⠗", "⠘", "⠙", "⠚", "⠛", "⠜", "⠝", "⠞", "⠟", "⠠", "⠡", "⠢", "⠣", "⠤", "⠥",
+    "⠦", "⠧", "⠨", "⠩", "⠪", "⠫", "⠬", "⠭", "⠮", "⠯", "⠰", "⠱", "⠲", "⠳", "⠴", "⠵", "⠶", "⠷", "⠸",
+    "⠹", "⠺", "⠻", "⠼", "⠽", "⠾", "⠿",
 ];
 
-// picture needs to end up as multiple of 2 x multiple of 3
-// also should fit in current terminal size
-fn calculate_size() {
-    let pic_size = (1920, 1280);
+fn make_braille_pic(picture: DynamicImage) -> Vec<Vec<u8>> {
+    let num_cells = get_cells_size(picture.width(), picture.height());
+    let braille_size = (num_cells.0 * 2, num_cells.1 * 3);
+
+    let resized_image = picture.resize_exact(braille_size.0, braille_size.1, Lanczos3);
+    let bw_image = resized_image.into_luma16();
+
+    let mut buf: Vec<Vec<u8>> = vec![vec![0; num_cells.0 as usize]; num_cells.1 as usize];
+    for (x, y, pixel) in bw_image.enumerate_pixels() {
+        let pixel_value = pixel.0[0];
+        let pixel_on = pixel_value > 32768;
+        if pixel_on {
+            let row = y / 3;
+            let col = x / 2;
+            let braille_row = y % 3;
+            let braille_col = x % 2;
+            buf[row as usize][col as usize] += 1 << (3 * braille_col + braille_row);
+        }
+    }
+
+    buf
+}
+
+fn get_cells_size(width: u32, height: u32) -> (u32, u32) {
+    let pic_size = (width as f32, height as f32);
     let term_size = size().unwrap();
 
-    let pic_landscape = pic_size.0 >= pic_size.1;
-    if pic_landscape {
-        let scale_factor = pic_size.0 / term_size.0;
-    } else {
-        let scale_factor = pic_size.1 / term_size.1;
-    }
+    let bounded_term_size = ((term_size.0) as f32 / 2.0, (term_size.1 - 1) as f32);
+    let scale_factors = (
+        pic_size.0 / bounded_term_size.0,
+        pic_size.1 / bounded_term_size.1,
+    );
+    let scale_factor = f32::max(scale_factors.0, scale_factors.1);
+
+    (
+        2 * (pic_size.0 / scale_factor).floor() as u32,
+        (pic_size.1 / scale_factor).floor() as u32,
+    )
 }
 
 fn main() {
-    println!("{:?}", size());
+    let argv: Vec<String> = env::args().collect();
+    let my_image = ImageReader::open(&argv[1]).unwrap().decode().unwrap();
+    for row in make_braille_pic(my_image) {
+        for braille_index in row {
+            print!("{}", BRAILLE[braille_index as usize]);
+        }
+        println!()
+    }
 }