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use std::{fs::File, io::BufWriter};
use anyhow::{anyhow, bail};
use camino::{Utf8Path, Utf8PathBuf};
use colorsquash::Squasher;
use gifed::writer::{GifBuilder, ImageBuilder};
use png::{ColorType, Decoder, Encoder};
use zune_jpeg::{zune_core::colorspace::ColorSpace, JpegDecoder};
fn main() -> Result<(), anyhow::Error> {
// I should use clap or at least getopt, but this is fine. It's 20LOC.
let usage = || -> ! {
println!("usage: squash <color count> <input> <output>");
std::process::exit(0);
};
let mut argv = std::env::args().skip(1);
let color_count: u8 = if let Some(Ok(count)) = argv.next().map(|r| r.parse::<usize>()) {
if count > 256 {
eprintln!("max colour count must be 256 or below");
std::process::exit(1);
} else {
(count - 1) as u8
}
} else {
usage()
};
let input_path: Utf8PathBuf = if let Some(path) = argv.next() {
path.into()
} else {
usage();
};
let output_path: Utf8PathBuf = if let Some(path) = argv.next() {
path.into()
} else {
usage();
};
let mut image = match input_path.extension() {
None => {
eprintln!("can't determine input filetype!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
Some("png") => get_png(input_path)?,
Some("jpg") | Some("jpeg") => get_jpg(input_path)?,
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
};
let mut squasher = Squasher::new(color_count, &image.data);
let size = squasher.map_over(&mut image.data);
image.data.resize(size, 0);
println!(
"selected {} colours of max {}",
squasher.palette().len(),
color_count
);
match output_path.extension() {
None => {
eprintln!("can't determine output filetype! defaulting to png");
save_png(image, squasher, output_path)
}
Some("png") => save_png(image, squasher, output_path),
Some("gif") => save_gif(image, squasher, output_path),
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupport output types are: GIF, PNG");
std::process::exit(1);
}
}
}
struct Image {
width: usize,
height: usize,
data: Vec<u8>,
}
fn get_png<P: AsRef<Utf8Path>>(path: P) -> Result<Image, anyhow::Error> {
let decoder = Decoder::new(File::open(path.as_ref())?);
let mut reader = decoder.read_info()?;
let mut data = vec![0; reader.output_buffer_size()];
let info = reader.next_frame(&mut data)?;
data.resize(info.buffer_size(), 0);
let colors = info.color_type;
match colors {
ColorType::Grayscale | ColorType::GrayscaleAlpha | ColorType::Indexed => {
bail!("colortype {colors:?} not supported")
}
ColorType::Rgba => {
let pixels = info.width as usize * info.height as usize;
// the first RGB is fine, we don't need to touch it
for idx in 1..pixels {
data[idx * 3] = data[idx * 4];
data[idx * 3 + 1] = data[idx * 4 + 1];
data[idx * 3 + 2] = data[idx * 4 + 2];
}
data.resize(pixels * 3, 0);
Ok(Image {
width: info.width as usize,
height: info.height as usize,
data,
})
}
ColorType::Rgb => Ok(Image {
width: info.width as usize,
height: info.height as usize,
data,
}),
}
}
fn get_jpg<P: AsRef<Utf8Path>>(path: P) -> Result<Image, anyhow::Error> {
let content = std::fs::read(path.as_ref())?;
let mut dec = JpegDecoder::new(&content);
let pixels = dec.decode()?;
let info = dec
.info()
.ok_or(anyhow!("image had no info; this should be impossible"))?;
let colorspace = dec.get_output_colorspace();
match colorspace {
Some(ColorSpace::RGB) => (),
_ => bail!("colorspace {colorspace:?} not supported"),
}
Ok(Image {
width: info.width as usize,
height: info.height as usize,
data: pixels,
})
}
fn save_png(image: Image, squasher: Squasher<u8>, path: Utf8PathBuf) -> Result<(), anyhow::Error> {
let file = File::create(path)?;
let bufw = BufWriter::new(file);
let mut enc = Encoder::new(bufw, image.width as u32, image.height as u32);
enc.set_color(ColorType::Indexed);
enc.set_depth(png::BitDepth::Eight);
enc.set_palette(squasher.palette_bytes());
enc.write_header()?.write_image_data(&image.data)?;
Ok(())
}
fn save_gif(image: Image, squasher: Squasher<u8>, path: Utf8PathBuf) -> Result<(), anyhow::Error> {
// I don't think I like this API anymore. It's a builder API, that's fine.
// I should make it so you can mutate the Gif directly.
GifBuilder::new(image.width as u16, image.height as u16)
.palette(squasher.palette_bytes().as_slice().try_into().unwrap())
.image(ImageBuilder::new(image.width as u16, image.height as u16).build(image.data)?)
.build()?
.save(path)?;
Ok(())
}
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