core/scale: add proper rescaling

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

diff --git a/nihav-core/src/scale/scale.rs b/nihav-core/src/scale/scale.rs
deleted file mode 100644 (file)
index a0bd0ca..0000000
--- a/nihav-core/src/scale/scale.rs
+++ /dev/null
@@ -1,124 +0,0 @@
-use super::*;
-use super::kernel::Kernel;
-
-struct NNResampler {}
-
-impl NNResampler {
-    fn new() -> Self { Self{} }
-}
-
-#[allow(clippy::comparison_chain)]
-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;
-            }
-        }
-    }
-}
-
-fn fill_plane<T: Copy>(dst: &mut [T], w: usize, h: usize, stride: usize, val: T) {
-    for row in dst.chunks_mut(stride).take(h) {
-        for el in row.iter_mut().take(w) {
-            *el = val;
-        }
-    }
-}
-
-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;
-                }
-            }
-            let dfmt = $dbuf.get_info().get_format();
-            let ndcomp = dfmt.get_num_comp();
-            if ndcomp > ncomp {
-                if !fmt.alpha && dfmt.alpha {
-                    let acomp = ndcomp - 1;
-                    let dstride = $dbuf.get_stride(acomp);
-                    let (dw, dh) = $dbuf.get_dimensions(acomp);
-                    let doff = $dbuf.get_offset(acomp);
-                    let dst = $dbuf.get_data_mut().unwrap();
-                    fill_plane(&mut dst[doff..], dw, dh, dstride, 0);
-                }
-                if fmt.model.is_yuv() && ((!fmt.alpha && ncomp == 1) || (fmt.alpha && ncomp == 2)) && ndcomp >= 3 {
-                    let uval = 1 << (dfmt.comp_info[1].unwrap().depth - 1);
-                    let vval = 1 << (dfmt.comp_info[2].unwrap().depth - 1);
-
-                    let ustride = $dbuf.get_stride(1);
-                    let vstride = $dbuf.get_stride(2);
-                    let (uw, uh) = $dbuf.get_dimensions(1);
-                    let (vw, vh) = $dbuf.get_dimensions(2);
-                    let uoff = $dbuf.get_offset(1);
-                    let voff = $dbuf.get_offset(2);
-                    let dst = $dbuf.get_data_mut().unwrap();
-                    fill_plane(&mut dst[uoff..], uw, uh, ustride, uval);
-                    fill_plane(&mut dst[voff..], vw, vh, vstride, vval);
-                }
-            }
-    };
-}
-
-impl Kernel for NNResampler {
-    fn init(&mut self, in_fmt: &ScaleInfo, dest_fmt: &ScaleInfo, _options: &[(String, String)]) -> 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())
-}
-