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use super::*;
use super::kernel::Kernel;
struct NNResampler {}
impl NNResampler {
fn new() -> Self { Self{} }
}
fn scale_line<T:Copy>(src: &[T], dst: &mut [T], src_w: usize, dst_w: usize) {
if src_w == dst_w {
(&mut dst[..dst_w]).copy_from_slice(&src[..dst_w]);
} else if src_w < dst_w {
if dst_w % src_w == 0 {
let step = dst_w / src_w;
for (out, srcv) in dst.chunks_exact_mut(step).take(src_w).zip(src.iter()) {
for el in out.iter_mut() {
*el = *srcv;
}
}
} else {
let mut pos = 0;
for out in dst.iter_mut().take(dst_w) {
*out = src[pos / dst_w];
pos += src_w;
}
}
} else {
if dst_w % src_w == 0 {
let step = src_w / dst_w;
for (out, srcv) in dst.iter_mut().take(dst_w).zip(src.iter().step_by(step)) {
*out = *srcv;
}
} else {
let mut pos = 0;
for out in dst.iter_mut().take(dst_w) {
*out = src[pos / dst_w];
pos += src_w;
}
}
}
}
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;
scale_line(&src[soff..], &mut dst[doff..], sw, dw);
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<dyn Kernel> {
Box::new(NNResampler::new())
}
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