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use crate::{BLOCK_SIZE, Frame, huffman::decode_huff};
use framework::BitstreamFilter;
use glam::{IVec2, ivec2};
pub struct Dec {
res: IVec2,
last: Frame,
}
impl BitstreamFilter for Dec {
const INPUT_CODEC_ID: &str = "V_VCETEST2";
const OUTPUT_CODEC_ID: &str = "V_UNCOMPRESSED";
fn new(width: u32, height: u32) -> Self {
let res = ivec2(width as i32, height as i32);
Self {
res,
last: Frame::new(res),
}
}
fn process_block(&mut self, a: Vec<u8>) -> Vec<u8> {
let buf = decode_huff(a);
let mut buf = buf.as_slice();
let mut frame = Frame::new(self.res);
for by in 0..frame.res.y / BLOCK_SIZE {
for bx in 0..frame.res.x / BLOCK_SIZE {
let boff = ivec2(bx * BLOCK_SIZE, by * BLOCK_SIZE);
let reloff = ivec2(buf[0] as i32 - 127, buf[1] as i32 - 127);
buf = &buf[2..];
let roff = reloff + boff;
Frame::copy_block(&self.last, &mut frame, roff, boff);
let size = frame.import_block_diff(boff, buf);
buf = &buf[size..];
}
}
self.last = frame.clone();
frame.data
}
}
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