sheetsmithlib 0.1.3

The goto library for sprite sheet packing
Documentation 
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use anyhow::{Ok, Result, bail};
use image::*;

// Trim transparency of image
pub fn trim_image(image: &RgbaImage, debug: bool) -> Result<ImageBuffer<Rgba<u8>, Vec<u8>>> {
    let mut trimmed_image = image.clone();
    let (width, height) = trimmed_image.dimensions();
    let mut min_x = width;
    let mut min_y = height;
    let mut max_x = 0;
    let mut max_y = 0;

    for y in 0..height {
        for x in 0..width {
            let pixel = trimmed_image.get_pixel(x, y);
            if pixel[3] > 0 {
                min_x = min_x.min(x);
                min_y = min_y.min(y);
                max_x = max_x.max(x);
                max_y = max_y.max(y);
            }
        }
    }

    if min_x <= max_x && min_y <= max_y {
        trimmed_image = image::imageops::crop_imm(
            &trimmed_image,
            min_x,
            min_y,
            max_x - min_x + 1,
            max_y - min_y + 1,
        )
        .to_image();
    }

    if debug {
        println!(
            "Trimmed Image - Original Dimensions: {}x{}, Trimmed Dimensions: {}x{}",
            width,
            height,
            trimmed_image.width(),
            trimmed_image.height()
        );
    }

    return Ok(trimmed_image);
}

pub fn find_optimal_size(
    image_files: Vec<(String, RgbaImage)>,
    padding: u32,
) -> Result<(u32, u32)> {
    if image_files.is_empty() {
        bail!("No image files provided.");
    }

    let mut new_image_files = image_files.clone();
    let mut total_area = 0 as f64;

    // Keep square-ish layout assumption
    while (new_image_files.len() as f32).sqrt().fract() != 0.0 {
        new_image_files.push((new_image_files[0].0.clone(), new_image_files[0].1.clone()));
    }

    for (_, image) in &new_image_files {
        let height = image.height() + (padding * 2);
        let width = image.width() + (padding * 2);
        total_area += (height * width) as f64;
    }

    let sqrt_area = total_area.sqrt();
    Ok((sqrt_area as u32, sqrt_area as u32))
}

pub fn walk_input_directory(
    input_dir: &str,
    debug: bool,
) -> Result<(Vec<(String, RgbaImage)>, i32)> {
    // Convert string to path
    let input_dir = std::path::Path::new(&input_dir);

    // Read image files from input directory
    let mut image_count = 0;
    let mut image_files = Vec::<(String, RgbaImage)>::new();
    let mut entries: Vec<_> = input_dir
        .read_dir()?
        .filter_map(|entry| entry.ok())
        .filter(|entry| {
            entry.path().is_file()
                && entry.path().extension().map_or(false, |ext| {
                    ext.eq_ignore_ascii_case("png") || ext.eq_ignore_ascii_case("jpg")
                })
        })
        .collect();

    entries.sort_by(|a, b| a.file_name().cmp(&b.file_name()));

    entries.iter().for_each(|entry| {
        if debug {
            println!("[DEBUG] Found image file: {}", entry.path().display());
        }

        image_files.push((
            entry.file_name().to_string_lossy().to_string(),
            image::open(entry.path())
                .expect("Failed to open image")
                .to_rgba8(),
        ));

        image_count += 1;
    });

    Ok((image_files, image_count))
}

/// Parse size arg
pub fn parse_size_arg(size: &str) -> Result<(u32, u32)> {
    let parts: Vec<&str> = size.split('x').collect();
    if parts.len() != 2 {
        anyhow::bail!("Invalid size format. Expected 'WIDTHxHEIGHT'.");
    }
    let width = parts[0].parse::<u32>()?;
    let height = parts[1].parse::<u32>()?;
    Ok((width, height))
}