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|
#![feature(box_patterns)]
use anyhow::Context;
use clap::Parser;
use evc::{
block::{Block, BlockInner},
frame::Frame,
header::Header,
ser::Source,
view::View,
};
use std::io::{BufReader, BufWriter};
#[derive(Parser)]
#[clap(about, version)]
pub struct DecodeArgs {}
fn main() -> anyhow::Result<()> {
let _args = DecodeArgs::parse();
let mut input = BufReader::new(std::io::stdin());
let mut output = BufWriter::new(std::io::stdout());
let header = input.get::<Header>().context("reading header")?;
eprintln!("{header:?}");
let size = header.resolution;
let mut prev = Frame::new(size);
for i in 0.. {
eprintln!("decode frame {i}");
let block = Block::read(&mut input, size).context("reading encoded frame")?;
let mut frame = Frame::new(size);
blit_block(
&block,
frame.view_mut((0, 0), size),
prev.view((0, 0), size),
);
frame.write(&mut output).context("writing raw frame")?;
prev = frame;
}
drop(input);
Ok(())
}
fn blit_block(block: &Block, mut target: View<&mut Frame>, prev: View<&Frame>) {
match &block.inner {
BlockInner::Literal(pixels) => target.set_pixels(pixels),
BlockInner::Split(box [a, b]) => {
let [at, bt] = target.split_mut_unsafe();
let [ap, bp] = prev.split();
blit_block(a, at, ap);
blit_block(b, bt, bp);
}
BlockInner::Reference { translation: _ } => target.copy_from(&prev),
}
}
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