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use crate::{debug::draw_debug, huff::read_huff, split::split, Block, Frame, Pixel, View, P2};
use rayon::join;
use std::io::{BufReader, BufWriter, Read, Result, Write};
pub fn decode(size: P2, debug: bool, input: impl Read, output: impl Write) -> Result<()> {
let mut input = BufReader::new(input);
let mut output = BufWriter::new(output);
let mut frame = Frame::new(size);
let mut last_frame = Frame::new(size);
let mut debug_frame = if debug { Some(Frame::new(size)) } else { None };
let huff = true;
loop {
let b = if huff {
let mut buf = vec![];
read_huff(&mut input, &mut buf)?;
let mut buf = std::io::Cursor::new(&mut buf);
Block::read(&mut buf, View::all(size))?
} else {
Block::read(&mut input, View::all(size))?
};
decode_block(&last_frame, &mut frame, View::all(size), &b);
if let Some(debug_frame) = &mut debug_frame {
debug_frame.pixels.copy_from_slice(&frame.pixels);
draw_debug(debug_frame, View::all(size), &b);
Frame::write(&mut output, &debug_frame)?;
} else {
Frame::write(&mut output, &frame)?;
}
last_frame.pixels.copy_from_slice(&frame.pixels); // TODO use mem::swap
frame.pixels.iter_mut().for_each(|e| *e = Pixel::BLACK);
}
}
pub fn decode_block(last_frame: &Frame, frame: &mut Frame, view: View, block: &Block) {
match block {
Block::Lit(pxs) => frame.import(view, &pxs),
Block::Split(a, b) => {
let [av, bv] = split(view);
let (frame1, frame2) =
unsafe { (&mut *(frame as *mut Frame), &mut *(frame as *mut Frame)) };
join(
|| decode_block(last_frame, frame1, av, &a),
|| decode_block(last_frame, frame2, bv, &b),
);
}
Block::Ref(r) => {
for y in view.a.y..view.b.y {
for x in view.a.x..view.b.x {
let p = P2 { x, y };
frame[p] = last_frame[p + r.pos_off] + r.color_off
}
}
}
}
}
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