codecs: implement Default trait for MV

[nihav.git] / nihav-core / src / scale / scale.rs

use super::*;
use super::kernel::Kernel;

struct NNResampler {}

impl NNResampler {
    fn new() -> Self { Self{} }
}

macro_rules! scale_loop {
    ($sbuf:expr, $dbuf:expr) => {
            let fmt = $sbuf.get_info().get_format();
            let ncomp = fmt.get_num_comp();
            for comp in 0..ncomp {
                let istride = $sbuf.get_stride(comp);
                let dstride = $dbuf.get_stride(comp);
                let (sw, sh) = $sbuf.get_dimensions(comp);
                let (dw, dh) = $dbuf.get_dimensions(comp);
                let ioff = $sbuf.get_offset(comp);
                let mut doff = $dbuf.get_offset(comp);
                let src = $sbuf.get_data();
                let dst = $dbuf.get_data_mut().unwrap();
                for y in 0..dh {
                    let sy = y * sh / dh;
                    let soff = ioff + sy * istride;
                    for x in 0..dw {
                        let sx = x * sw / dw;
                        dst[doff + x] = src[soff + sx];
                    }
                    doff += dstride;
                }
            }
    };
}

impl Kernel for NNResampler {
    fn init(&mut self, in_fmt: &ScaleInfo, dest_fmt: &ScaleInfo) -> ScaleResult<NABufferType> {
        let res = alloc_video_buffer(NAVideoInfo::new(dest_fmt.width, dest_fmt.height, false, in_fmt.fmt), 3);
        if res.is_err() { return Err(ScaleError::AllocError); }
        Ok(res.unwrap())
    }
    fn process(&mut self, pic_in: &NABufferType, pic_out: &mut NABufferType) {
        if let (Some(ref sbuf), Some(ref mut dbuf)) = (pic_in.get_vbuf(), pic_out.get_vbuf()) {
            scale_loop!(sbuf, dbuf);
        } else if let (Some(ref sbuf), Some(ref mut dbuf)) = (pic_in.get_vbuf16(), pic_out.get_vbuf16()) {
            scale_loop!(sbuf, dbuf);
        } else if let (Some(ref sbuf), Some(ref mut dbuf)) = (pic_in.get_vbuf32(), pic_out.get_vbuf32()) {
            scale_loop!(sbuf, dbuf);
        } else {
            unreachable!();
        }
    }
}

pub fn create_scale() -> Box<Kernel> {
    Box::new(NNResampler::new())
}