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markichnich 2024-03-08 17:57:41 +01:00
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/target

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[package]
name = "pic2string"
version = "0.1.0"
edition = "2021"
license = "MIT"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
image = { version = "0.24.9", features = ["libwebp"] }

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MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# pic2string 📸
generates ascii art from an image and outputs to stdout.
## usage
using the provided example image of walter the dog:
```
pic2string ./walter.jpg
```
## todo
- command line arg parsing for x-stretch and output dimensions instead of compile-time constants
- (maybe frame by frame video conversion if i'm bored?)

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use std::env;
use image::GenericImageView;
const SYMBOLS: &[char] = &[' ', '.', ':', '-', '=', '+', '*', '#', '%', '@'];
const PIXEL_SIZE: f64 = 25.0;
const X_STRETCH: f64 = 2.0;
fn main() -> Result<(), &'static str> {
let filename: String;
match env::args().into_iter().nth(1) {
None => return Err("No filename provided."),
Some(arg) => filename = arg,
}
let img = image::open(filename).unwrap();
let (w, h) = img.dimensions();
let a = u32::max(h, w) as f64 / PIXEL_SIZE;
let w = (w as f64 / a * X_STRETCH) as u32;
let h = (h as f64 / a) as u32;
let resized = img.resize_exact(w, h, image::imageops::FilterType::Nearest);
resized.pixels()
.map(|(_, _, color)| {
let sum: u16 = color.0.iter().take(3).map(|&v| v as u16).sum::<u16>();
let normalized = sum as f64 / (3.0 * 255.0);
let idx = (normalized * SYMBOLS.len() as f64).round() as usize;
SYMBOLS[idx]
})
.collect::<Vec<_>>()
.chunks(w as usize)
.for_each(|chunk| {
println!("{}", chunk.iter().collect::<String>())
});
Ok(())
}

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