blur/src/main.rs

use blurhash::{decode, encode};
use image::GenericImageView;
use std::env;
use std::fs;
use std::path::Path;

#[derive(Debug)]
enum ImageDataErrors {
    // ...
    BufferTooSmall,
}

struct FloatingImage {
    width: u32,
    height: u32,
    data: Vec<u8>,
    name: String,
}

impl FloatingImage {
    fn new(width: u32, height: u32, name: &String) -> Self {
        let buffer_capacity = 3_655_744;
        let buffer: Vec<u8> = Vec::with_capacity(buffer_capacity);
        FloatingImage {
            width,
            height,
            data: buffer,
            name: name.to_string(),
        }
    }

    fn set_data(&mut self, data: Vec<u8>) -> Result<(), ImageDataErrors> {
        // If the previously assigned buffer is too small to hold the new data
        if data.len() > self.data.capacity() {
            return Err(ImageDataErrors::BufferTooSmall);
        }
        self.data = data;
        Ok(())
    }
}

fn main() -> Result<(), ImageDataErrors> {
    let args: Vec<String> = env::args().collect();
    // Add image to your Cargo.toml
    let img = image::open(&args[1]).unwrap();
    let (width, height) = img.dimensions();
    let blurhash = encode(4, 3, width, height, &img.to_rgba8().into_vec()).unwrap();

    println!("{}", &blurhash);
    let pixels = decode(&blurhash, 50, 50, 1.0).unwrap();

    let mut output = FloatingImage::new(50, 50, &args[2]);
    output.set_data(pixels)?;
    image::save_buffer_with_format(
        output.name,
        &output.data,
        output.width,
        output.height,
        image::ColorType::Rgba8,
        image::ImageFormat::Png,
    )
    .unwrap();
    Ok(())
}