codec_support/imgwrite: flip alpha plane too

[nihav.git] / nihav-codec-support / src / imgwrite / mod.rs

//! Simple PNM image writers for RGB and YUV images.
use std::io::prelude::*;
use std::fs::File;
use nihav_core::frame::{NABufferType, NAFrameRef};

/// Writes PGMYUV for input frame.
pub fn write_pgmyuv(name: &str, frm: NAFrameRef) -> std::io::Result<()> {
    if let NABufferType::None = frm.get_buffer() { return Ok(()); }
    let mut ofile = File::create(name)?;
    let buf = frm.get_buffer().get_vbuf().unwrap();
    let is_flipped = buf.get_info().is_flipped();
    let (w, h) = buf.get_dimensions(0);
    let (w2, h2) = buf.get_dimensions(1);
    let full_w = w2 * 2 > w;
    let has_alpha = buf.get_info().get_format().has_alpha();
    let mut tot_h = h + h2;
    if has_alpha {
        tot_h += h;
    }
    if full_w {
        tot_h += h2;
    }
    let hdr = format!("P5\n{} {}\n255\n", w, tot_h);
    ofile.write_all(hdr.as_bytes())?;
    let dta = buf.get_data();
    let ls = buf.get_stride(0);
    let pad: Vec<u8> = vec![0xFF; if !full_w { (w - w2 * 2) / 2 } else { w - w2 } ];
    if !is_flipped {
        let ylines = dta.chunks(ls).take(h);
        for line in ylines {
            ofile.write_all(&line[..w])?;
        }
    } else {
        let ylines = dta[..h * ls].chunks(ls).rev();
        for line in ylines {
            ofile.write_all(&line[..w])?;
        }
    }
    let base1 = buf.get_offset(1);
    let stride1 = buf.get_stride(1);
    let base2 = buf.get_offset(2);
    let stride2 = buf.get_stride(2);
    let u = &dta[base1..][..h2*stride1];
    let v = &dta[base2..][..h2*stride2];
    let has_chroma = stride1 > 0 && stride2 > 0;
    if !full_w && has_chroma {
        if !is_flipped {
            for (uline, vline) in u.chunks(stride1).zip(v.chunks(stride2)) {
                ofile.write_all(&uline[..w2])?;
                ofile.write_all(pad.as_slice())?;

                ofile.write_all(&vline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
        } else {
            for (uline, vline) in u.chunks(stride1).rev().zip(v.chunks(stride2).rev()) {
                ofile.write_all(&uline[..w2])?;
                ofile.write_all(pad.as_slice())?;

                ofile.write_all(&vline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
        }
    } else if has_chroma {
        if !is_flipped {
            for uline in u.chunks(stride1) {
                ofile.write_all(&uline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
            for vline in v.chunks(stride2) {
                ofile.write_all(&vline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
        } else {
            for uline in u.chunks(stride1).rev() {
                ofile.write_all(&uline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
            for vline in v.chunks(stride2).rev() {
                ofile.write_all(&vline[..w2])?;
                ofile.write_all(pad.as_slice())?;
            }
        }
    }
    if has_alpha {
        let ls = buf.get_stride(3);
        if !is_flipped {
            let alines = dta[buf.get_offset(3)..].chunks(ls).take(h);
            for line in alines {
                ofile.write_all(&line[..w])?;
            }
        } else {
            let alines = dta[buf.get_offset(3)..].chunks(ls).take(h).rev();
            for line in alines {
                ofile.write_all(&line[..w])?;
            }
        }
    }
    Ok(())
}

/// Writes output PPM for input paletted input frame.
pub fn write_palppm(name: &str, frm: NAFrameRef) -> std::io::Result<()> {
    if let NABufferType::None = frm.get_buffer() { return Ok(()); }
    let mut ofile = File::create(name)?;
    let buf = frm.get_buffer().get_vbuf().unwrap();
    let (w, h) = buf.get_dimensions(0);
    let paloff = buf.get_offset(1);
    let hdr = format!("P6\n{} {}\n255\n", w, h);
    ofile.write_all(hdr.as_bytes())?;
    let dta = buf.get_data();
    let ls = buf.get_stride(0);
    let offs: [usize; 3] = [
            buf.get_info().get_format().get_chromaton(0).unwrap().get_offset() as usize,
            buf.get_info().get_format().get_chromaton(1).unwrap().get_offset() as usize,
            buf.get_info().get_format().get_chromaton(2).unwrap().get_offset() as usize
        ];
    let flipped = buf.get_info().is_flipped();
    let mut idx  = if !flipped { 0 } else { ls * h };
    let mut line: Vec<u8> = vec![0; w * 3];
    for _ in 0..h {
        if flipped {
            idx -= ls;
        }
        let src = &dta[idx..(idx+w)];
        for x in 0..w {
            let pix = src[x] as usize;
            line[x * 3 + 0] = dta[paloff + pix * 3 + offs[0]];
            line[x * 3 + 1] = dta[paloff + pix * 3 + offs[1]];
            line[x * 3 + 2] = dta[paloff + pix * 3 + offs[2]];
        }
        ofile.write_all(line.as_slice())?;
        if !flipped {
            idx += ls;
        }
    }
    Ok(())
}

/// Writes PPM file for RGB input.
pub fn write_rgbppm(name: &str, frm: NAFrameRef) -> std::io::Result<()> {
    if let NABufferType::None = frm.get_buffer() { return Ok(()); }
    let mut ofile = File::create(name)?;
    let info = frm.get_buffer().get_video_info().unwrap();
    let flipped = info.is_flipped();
    let buffer = frm.get_buffer();
    if let Some(ref buf) = buffer.get_vbuf() {
        let (w, h) = buf.get_dimensions(0);
        let hdr = format!("P6\n{} {}\n255\n", w, h);
        ofile.write_all(hdr.as_bytes())?;
        let dta = buf.get_data();
        let stride = buf.get_stride(0);
        let offs: [usize; 3] = [
                info.get_format().get_chromaton(0).unwrap().get_offset() as usize,
                info.get_format().get_chromaton(1).unwrap().get_offset() as usize,
                info.get_format().get_chromaton(2).unwrap().get_offset() as usize
            ];
        let step = info.get_format().get_elem_size() as usize;
        let mut line: Vec<u8> = vec![0; w * 3];
        if !flipped {
            for src in dta.chunks(stride) {
                for x in 0..w {
                    line[x * 3 + 0] = src[x * step + offs[0]];
                    line[x * 3 + 1] = src[x * step + offs[1]];
                    line[x * 3 + 2] = src[x * step + offs[2]];
                }
                ofile.write_all(line.as_slice())?;
            }
        } else {
            for src in dta[..stride * h].chunks(stride).rev() {
                for x in 0..w {
                    line[x * 3 + 0] = src[x * step + offs[0]];
                    line[x * 3 + 1] = src[x * step + offs[1]];
                    line[x * 3 + 2] = src[x * step + offs[2]];
                }
                ofile.write_all(line.as_slice())?;
            }
        }
    } else if let NABufferType::Video16(ref buf) = buffer {
        let (w, h) = buf.get_dimensions(0);
        let hdr = format!("P6\n{} {}\n255\n", w, h);
        ofile.write_all(hdr.as_bytes())?;
        let dta = buf.get_data();
        let stride = buf.get_stride(0);
        let depths: [u8; 3] = [
                info.get_format().get_chromaton(0).unwrap().get_depth(),
                info.get_format().get_chromaton(1).unwrap().get_depth(),
                info.get_format().get_chromaton(2).unwrap().get_depth()
            ];
        let masks: [u16; 3] = [
                (1 << depths[0]) - 1,
                (1 << depths[1]) - 1,
                (1 << depths[2]) - 1
            ];
        let shifts: [u8; 3] = [
                info.get_format().get_chromaton(0).unwrap().get_shift(),
                info.get_format().get_chromaton(1).unwrap().get_shift(),
                info.get_format().get_chromaton(2).unwrap().get_shift()
            ];
        let mut line: Vec<u8> = vec![0; w * 3];
        if !flipped {
            for src in dta.chunks(stride) {
                for x in 0..w {
                    let elem = src[x];
                    let r = ((elem >> shifts[0]) & masks[0]) << (8 - depths[0]);
                    let g = ((elem >> shifts[1]) & masks[1]) << (8 - depths[1]);
                    let b = ((elem >> shifts[2]) & masks[2]) << (8 - depths[2]);
                    line[x * 3 + 0] = r as u8;
                    line[x * 3 + 1] = g as u8;
                    line[x * 3 + 2] = b as u8;
                }
                ofile.write_all(line.as_slice())?;
            }
        } else {
            for src in dta[..h * stride].chunks(stride).rev() {
                for x in 0..w {
                    let elem = src[x];
                    let r = ((elem >> shifts[0]) & masks[0]) << (8 - depths[0]);
                    let g = ((elem >> shifts[1]) & masks[1]) << (8 - depths[1]);
                    let b = ((elem >> shifts[2]) & masks[2]) << (8 - depths[2]);
                    line[x * 3 + 0] = r as u8;
                    line[x * 3 + 1] = g as u8;
                    line[x * 3 + 2] = b as u8;
                }
                ofile.write_all(line.as_slice())?;
            }
        }
    } else {
panic!(" unhandled buf format");
    }
    Ok(())
}

/// Writes PNM file with a format depending on input format.
pub fn write_pnm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) -> std::io::Result<()> {
    if let NABufferType::None = frm.get_buffer() { return Ok(()); }

    let vinfo = frm.get_buffer().get_video_info().unwrap();
    if vinfo.get_format().is_paletted() {
        let name = format!("{}{:02}_{:06}.ppm", pfx, strno, num);
        write_palppm(name.as_str(), frm)
    } else if vinfo.get_format().get_model().is_yuv() {
        let name = format!("{}{:02}_{:06}.pgm", pfx, strno, num);
        write_pgmyuv(name.as_str(), frm)
    } else if vinfo.get_format().get_model().is_rgb() {
        let name = format!("{}{:02}_{:06}.ppm", pfx, strno, num);
        write_rgbppm(name.as_str(), frm)
    } else {
panic!(" unknown format");
    }
}