+Cargo.lock \ No newline at end of file

+[package]

+name = "pnm"

+version = "0.1.0"

+edition = "2021"

+description = "portable anymap format encoding and decoding"

+authors = ["bend-n <[email protected]>"]

+license = "MIT"

+repository = "https://github.com/bend-n/pnm"

+exclude = ["tdata", ".gitignore"]

+keywords = ["image", "format", "encoding", "decoding"]

+categories = ["multimedia::images", "graphics", "encoding"]

+

+[dependencies]

+atools = "0.1.1"

+fimg = { version = "0.4.41", default-features = false }

+

+[dev-dependencies]

+fimg = { version = "0.4.41", features = ["save"], default-features = false }

+MIT License

+

+Copyright (c) 2024 bendn

+

+Permission is hereby granted, free of charge, to any person obtaining a copy

+of this software and associated documentation files (the "Software"), to deal

+in the Software without restriction, including without limitation the rights

+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

+copies of the Software, and to permit persons to whom the Software is

+furnished to do so, subject to the following conditions:

+

+The above copyright notice and this permission notice shall be included in all

+copies or substantial portions of the Software.

+

+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

+SOFTWARE.

+# PNM

+

+provides encoders and decoders for the portable anymap formats. \ No newline at end of file

+fn main() {

+ for elem in std::env::args().skip(1) {

+ pnm::decode(&std::fs::read(elem).unwrap())

+ .unwrap()

+ .rgba()

+ .show();

+ }

+}

+//! decoding utilities

+use std::num::NonZeroU32;

+

+pub(crate) trait Read {

+ fn rd<const N: usize>(&mut self) -> Option<[u8; N]>;

+ fn by(&mut self) -> Option<u8> {

+ Some(self.rd::<1>()?[0])

+ }

+}

+impl<T: std::io::Read> Read for T {

+ fn rd<const N: usize>(&mut self) -> Option<[u8; N]> {

+ let mut buf = [0; N];

+ self.read_exact(&mut buf).ok()?;

+ Some(buf)

+ }

+}

+

+pub(crate) trait Ten {

+ fn ten() -> Self;

+}

+macro_rules! tenz {

+ ($for:ty) => {

+ impl Ten for $for {

+ fn ten() -> $for {

+ 10

+ }

+ }

+ };

+}

+tenz!(u8);

+tenz!(u16);

+tenz!(u32);

+tenz!(u64);

+tenz!(u128);

+tenz!(i8);

+tenz!(i16);

+tenz!(i32);

+tenz!(i64);

+tenz!(i128);

+

+/// Result alias with [`Error`].

+pub type Result<T> = std::result::Result<T, Error>;

+

+pub(crate) fn read_til<

+ T: Default + std::ops::Mul<T, Output = T> + std::ops::Add<T, Output = T> + From<u8> + Copy + Ten,

+>(

+ x: &mut &[u8],

+) -> Result<T> {

+ let mut n = T::default();

+ while let Some(x) = x.by() {

+ if x.is_ascii_whitespace() {

+ return Ok(n);

+ }

+ if !x.is_ascii_digit() {

+ return Err(Error::NotDigit(x as char));

+ }

+ n = n * T::ten() + T::from(x - b'0')

+ }

+ Ok(n)

+}

+

+macro_rules! dec_fn {

+ ($($f:ident)? $doc:literal) => {

+ use crate::decode::{decode_header, Error, Result};

+

+ #[doc = $doc]

+ pub fn decode(x: impl AsRef<[u8]>) -> Result<Output> {

+ let mut x = x.as_ref();

+ let magic = crate::decode::magic(&mut x).ok_or(Error::MissingMagic)?;

+ (magic == MAGIC)

+ .then_some(())

+ .ok_or(Error::WrongMagic {

+ got: magic,

+ should: MAGIC,

+ })?;

+ decode_wo_magic(x)

+ }

+

+ /// Decode without magic.

+ pub fn decode_wo_magic(mut x: &[u8]) -> Result<Output> {

+ let header = decode_header(&mut x, MAGIC)?;

+ decode_body_into(x, Uninit::new(header.width, header.height), $(header.$f.unwrap())?)

+ }

+ };

+}

+pub(crate) use dec_fn;

+

+/// Header for the older PNM formats. Not applicable to PAM.

+pub struct Header {

+ /// Magic number.

+ pub magic: u8,

+ pub width: NonZeroU32,

+ pub height: NonZeroU32,

+ /// Maximum value of each byte.

+ pub max: Option<u8>,

+}

+

+#[derive(Debug, Clone, Copy)]

+#[non_exhaustive]

+/// Errors that can occur on decoding.

+pub enum Error {

+ TooLarge,

+ NotDigit(char),

+ BadMagic(u8),

+ WrongMagic { got: u8, should: u8 },

+ MissingMagic,

+ ZeroWidth,

+ ZeroHeight,

+ MissingWidth,

+ MissingHeight,

+ MissingData,

+ MissingMax,

+ MissingDepth,

+ MissingTupltype,

+}

+

+impl std::fmt::Display for Error {

+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {

+ match self {

+ Self::TooLarge => write!(f, "image too big"),

+ Self::NotDigit(x) => write!(f, "found {x} while decoding number"),

+ Self::BadMagic(x) => write!(f, "{x} is not a valid magic number"),

+ Self::WrongMagic { got, should } => {

+ write!(f, "expected magic number {should} found {got}")

+ }

+ Self::MissingMagic => write!(f, "no magic number (likely not a pnm image)"),

+ Self::ZeroWidth => write!(f, "zero width"),

+ Self::ZeroHeight => write!(f, "zero height"),

+ Self::MissingWidth => write!(f, "no width"),

+ Self::MissingHeight => write!(f, "no height"),

+ Self::MissingData => write!(f, "no data"),

+ Self::MissingMax => write!(f, "no max value"),

+ Self::MissingDepth => write!(f, "no depth"),

+ Self::MissingTupltype => write!(f, "no tupltype"),

+ }

+ }

+}

+

+/// Decodes the magic number.

+pub fn magic(x: &mut &[u8]) -> Option<u8> {

+ (x.by()? == b'P').then_some(())?;

+ let m = x.by().map(|x| x - b'0');

+ while x.first()?.is_ascii_whitespace() {

+ x.by();

+ }

+ m

+}

+

+/// Get the older pnm formats header. Does not decode magic.

+pub fn decode_header(x: &mut &[u8], magic: u8) -> Result<Header> {

+ while x.first() == Some(&b'#') {

+ while let Some(b) = x.by()

+ && b != b'\n'

+ {}

+ }

+ let width = NonZeroU32::new(read_til(x)?).ok_or(Error::ZeroWidth)?;

+ let height = NonZeroU32::new(read_til(x)?).ok_or(Error::ZeroHeight)?;

+ width.checked_mul(height).ok_or(Error::TooLarge)?;

+ let max = if magic != 4 && magic != 1 {

+ Some(read_til(x)?)

+ } else {

+ None

+ };

+

+ if magic != 4 {

+ while x.first().ok_or(Error::MissingData)?.is_ascii_whitespace() {

+ x.by();

+ }

+ }

+ Ok(Header {

+ magic,

+ width,

+ height,

+ max,

+ })

+}

+Decodes the body of this image, placing it in the [`Uninit`] image.

+

+If you wish to use this yourself, use [`decode_header`] to create an [`Uninit`] image, before passing it to [`decode_body_into`]. \ No newline at end of file

+

+pub trait P<T: Copy> {

+ unsafe fn put<const N: usize>(&mut self, x: [T; N]);

+ #[cfg_attr(debug_assertions, track_caller)]

+ unsafe fn push(&mut self, x: T) {

+ self.put([x]);

+ }

+}

+

+impl<T: Copy> P<T> for *mut T {

+ #[cfg_attr(debug_assertions, track_caller)]

+ unsafe fn put<const N: usize>(&mut self, x: [T; N]) {

+ self.copy_from(x.as_ptr(), N);

+ *self = self.add(N);

+ }

+}

+

+pub const fn encode_bool(x: bool) -> u8 {

+ (x as u8) + b'0'

+}

+

+const MAGIC: [u32; 256] = [

+ 538976304, 538976305, 538976306, 538976307, 538976308, 538976309, 538976310, 538976311,

+ 538976312, 538976313, 538980401, 538980657, 538980913, 538981169, 538981425, 538981681,

+ 538981937, 538982193, 538982449, 538982705, 538980402, 538980658, 538980914, 538981170,

+ 538981426, 538981682, 538981938, 538982194, 538982450, 538982706, 538980403, 538980659,

+ 538980915, 538981171, 538981427, 538981683, 538981939, 538982195, 538982451, 538982707,

+ 538980404, 538980660, 538980916, 538981172, 538981428, 538981684, 538981940, 538982196,

+ 538982452, 538982708, 538980405, 538980661, 538980917, 538981173, 538981429, 538981685,

+ 538981941, 538982197, 538982453, 538982709, 538980406, 538980662, 538980918, 538981174,

+ 538981430, 538981686, 538981942, 538982198, 538982454, 538982710, 538980407, 538980663,

+ 538980919, 538981175, 538981431, 538981687, 538981943, 538982199, 538982455, 538982711,

+ 538980408, 538980664, 538980920, 538981176, 538981432, 538981688, 538981944, 538982200,

+ 538982456, 538982712, 538980409, 538980665, 538980921, 538981177, 538981433, 538981689,

+ 538981945, 538982201, 538982457, 538982713, 540028977, 540094513, 540160049, 540225585,

+ 540291121, 540356657, 540422193, 540487729, 540553265, 540618801, 540029233, 540094769,

+ 540160305, 540225841, 540291377, 540356913, 540422449, 540487985, 540553521, 540619057,

+ 0x20303231, 540095025, 540160561, 540226097, 540291633, 540357169, 540422705, 540488241,

+ 540553777, 540619313, 540029745, 540095281, 540160817, 540226353, 540291889, 540357425,

+ 540422961, 540488497, 540554033, 540619569, 540030001, 540095537, 540161073, 540226609,

+ 540292145, 540357681, 540423217, 540488753, 540554289, 540619825, 540030257, 540095793,

+ 540161329, 540226865, 540292401, 540357937, 540423473, 540489009, 540554545, 540620081,

+ 540030513, 540096049, 540161585, 540227121, 540292657, 540358193, 540423729, 540489265,

+ 540554801, 540620337, 540030769, 540096305, 540161841, 540227377, 540292913, 540358449,

+ 540423985, 540489521, 540555057, 540620593, 540031025, 540096561, 540162097, 540227633,

+ 540293169, 540358705, 540424241, 540489777, 540555313, 540620849, 540031281, 540096817,

+ 540162353, 540227889, 540293425, 540358961, 540424497, 540490033, 540555569, 540621105,

+ 540028978, 540094514, 540160050, 540225586, 540291122, 540356658, 540422194, 540487730,

+ 540553266, 540618802, 540029234, 540094770, 540160306, 540225842, 540291378, 540356914,

+ 540422450, 540487986, 540553522, 540619058, 540029490, 540095026, 540160562, 540226098,

+ 540291634, 540357170, 540422706, 540488242, 540553778, 540619314, 540029746, 540095282,

+ 540160818, 540226354, 540291890, 540357426, 540422962, 540488498, 540554034, 540619570,

+ 540030002, 540095538, 540161074, 540226610, 540292146, 540357682, 540423218, 540488754,

+ 540554290, 540619826, 540030258, 540095794, 540161330, 540226866, 540292402, 540357938,

+];

+

+/// Has a space. (_)

+pub const fn encode_(x: u8) -> [u8; 4] {

+ MAGIC[x as usize].to_le_bytes()

+}

+

+pub unsafe fn encodeu32(mut x: u32, buf: &mut *mut u8) {

+ let mut tmp = [0; 10];

+ let mut tp = tmp.as_mut_ptr();

+ while x >= 10 {

+ tp.write((x % 10) as u8 + b'0');

+ tp = tp.add(1);

+ x /= 10;

+ }

+ tp.write(x as u8 + b'0');

+ for b in tmp.into_iter().rev().skip_while(|&b| b == 0) {

+ buf.push(b);

+ }

+}

+Encodes directly into a buffer. Returns number of bytes written.

+Buffer should have at least [`size`] bytes.

+

+# Safety

+

+Undefined Behaviour when the buffer's length is less than [`size`]`(bytes)`. \ No newline at end of file

+Inaccurate estimate. Will always be greater than the real number of bytes. \ No newline at end of file

+//! crate for decoding/encoding the portable anymap format.

+#![allow(incomplete_features)]

+#![feature(

+ test,

+ generic_const_exprs,

+ ptr_sub_ptr,

+ array_chunks,

+ let_chains,

+ iter_array_chunks

+)]

+#![warn(

+ clippy::missing_const_for_fn,

+ clippy::suboptimal_flops,

+ clippy::dbg_macro,

+ clippy::use_self

+)]

+

+use fimg::{uninit, DynImage, Image};

+pub mod decode;

+pub(crate) mod encode;

+pub mod pam;

+pub mod pbm;

+pub mod pgm;

+pub mod ppm;

+pub use pam::PAM;

+

+/// Decode any [`pgm`], [`ppm`], [`pbm`], [`pam`] image.

+pub fn decode(x: &impl AsRef<[u8]>) -> decode::Result<DynImage<Vec<u8>>> {

+ let mut x = x.as_ref();

+ let magic = decode::magic(&mut x).ok_or(decode::Error::MissingMagic)?;

+ match magic {

+ pbm::raw::MAGIC => {

+ let header = decode::decode_header(&mut x, pbm::raw::MAGIC)?;

+ Ok(DynImage::Y(pbm::raw::decode_body_into_u8(

+ x,

+ uninit::Image::new(header.width, header.height),

+ )?))

+ }

+ pbm::plain::MAGIC => {

+ let header = decode::decode_header(&mut x, pbm::plain::MAGIC)?;

+ Ok(DynImage::Y(pbm::plain::decode_body_into_u8(

+ x,

+ uninit::Image::new(header.width, header.height),

+ )?))

+ }

+ pgm::raw::MAGIC => Ok(DynImage::Y(pgm::raw::decode_wo_magic(x)?)),

+ pgm::plain::MAGIC => Ok(DynImage::Y(pgm::plain::decode_wo_magic(x)?)),

+ ppm::raw::MAGIC => Ok(DynImage::Rgb(ppm::raw::decode_wo_magic(x)?)),

+ ppm::plain::MAGIC => Ok(DynImage::Rgb(ppm::plain::decode_wo_magic(x)?)),

+ pam::MAGIC => pam::decode_wo_magic(x),

+ _ => Err(decode::Error::BadMagic(magic)),

+ }

+}

+

+/// Encodes an image to one of the [`pgm`] or [`ppm`] portable anymap formats.

+///

+/// Please note that this will not produce a [`pam`], use [`PAM`] for that.

+pub trait Encode {

+ /// Encodes an image to one of the [`pgm`] or [`ppm`] portable anymap formats.

+ fn encode(self) -> Vec<u8>;

+ /// ASCII EDITION.

+ fn encode_plain(self) -> String;

+}

+

+macro_rules! x {

+ ($mod:ident) => {

+ impl<T: AsRef<[u8]>> Encode for Image<T, { $mod::CHANNELS }> {

+ fn encode(self) -> Vec<u8> {

+ $mod::raw::encode(self)

+ }

+ fn encode_plain(self) -> String {

+ $mod::plain::encode(self)

+ }

+ }

+ };

+ (t $mod:ident, $n:literal) => {

+ impl<T: AsRef<[u8]>> Encode for Image<T, $n> {

+ fn encode(self) -> Vec<u8> {

+ $mod::raw::encode(<Image<Box<[u8]>, { $mod::CHANNELS }>>::from(self.as_ref()))

+ }

+ fn encode_plain(self) -> String {

+ $mod::plain::encode(<Image<Box<[u8]>, { $mod::CHANNELS }>>::from(self.as_ref()))

+ }

+ }

+ };

+}

+x![pgm];

+x![t pgm, 2];

+x![ppm];

+x![t ppm, 4];

+//! [Portable Arbitrary Format](https://en.wikipedia.org/wiki/Netpbm#PAM_graphics_format) RGB (no alpha) image encoding and decoding.

+pub type Input<'a> = Image<&'a [u8], 3>;

+pub type Uninit = fimg::uninit::Image<u8, 3>;

+use std::num::NonZeroU32;

+

+use crate::decode::{read_til, Error, Read, Result};

+use crate::encode::{encodeu32, P};

+use atools::Join;

+use fimg::{DynImage, Image};

+

+pub const MAGIC: u8 = 7;

+

+/// Encode an <code>[Image]<[u8], N></code> to [PAM](https://en.wikipedia.org/wiki/Netpbm#PAM_graphics_format) Raw (binary) Image.

+/// And decode.

+pub trait PAM {

+ /// Encode this image to pam.

+ fn encode(self) -> Vec<u8>;

+ #[doc = include_str!("encode_into.md")]

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize;

+}

+

+/// Bool images.

+/// Unstable api.

+pub trait PAMBit {

+ /// Encode this bit image to pam.

+ fn encode_bitmap(self) -> Vec<u8>;

+ #[doc = include_str!("encode_into.md")]

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize;

+}

+

+impl<T: AsRef<[u8]>> PAM for Image<T, 1> {

+ fn encode(self) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(self.bytes()));

+ let n = unsafe { PAM::encode_into(self.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize {

+ encode_into((x.bytes(), (x.width(), x.height())), out, b"GRAYSCALE", 1)

+ }

+}

+

+impl<T: AsRef<[bool]>> PAMBit for Image<T, 1> {

+ fn encode_bitmap(self) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(self.as_ref().buffer()));

+ let n = unsafe { PAMBit::encode_into(self.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize {

+ let b = x.buffer().as_ref();

+ let b = std::slice::from_raw_parts(b.as_ptr() as *mut u8, b.len());

+ encode_into((b, (x.width(), x.height())), out, b"BLACKANDWHITE", 1)

+ }

+}

+

+impl<T: AsRef<[u8]>> PAM for Image<T, 2> {

+ fn encode(self) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(self.bytes()));

+ let n = unsafe { PAM::encode_into(self.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize {

+ encode_into(

+ (x.bytes(), (x.width(), x.height())),

+ out,

+ b"GRAYSCALE_ALPHA",

+ 2,

+ )

+ }

+}

+

+impl<T: AsRef<[u8]>> PAM for Image<T, 3> {

+ fn encode(self) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(self.bytes()));

+ let n = unsafe { PAM::encode_into(self.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize {

+ encode_into((x.bytes(), (x.width(), x.height())), out, b"RGB", 3)

+ }

+}

+

+impl<T: AsRef<[u8]>> PAM for Image<T, 4> {

+ fn encode(self) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(self.bytes()));

+ let n = unsafe { PAM::encode_into(self.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ unsafe fn encode_into(x: Self, out: *mut u8) -> usize {

+ encode_into((x.bytes(), (x.width(), x.height())), out, b"RGB_ALPHA", 2)

+ }

+}

+

+#[inline]

+unsafe fn encode_into<const N: usize>(

+ (buf, (w, h)): (&[u8], (u32, u32)),

+ out: *mut u8,

+ tupltype: &[u8; N],

+ depth: u8,

+) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.put(*b"\nWIDTH ");

+ encodeu32(w, &mut o);

+ o.put(*b"\nHEIGHT ");

+ encodeu32(h, &mut o);

+ o.put(*b"\nDEPTH ");

+ o.push(depth + b'0');

+ o.put(*b"\nMAXVAL 255\n");

+ o.put(*b"TUPLTYPE ");

+ o.put(*tupltype);

+ o.put(*b"\nENDHDR\n");

+ for &x in buf {

+ if &tupltype[..] == b"BLACKANDWHITE" {

+ o.push(x ^ 1)

+ } else {

+ o.push(x)

+ }

+ }

+

+ o.sub_ptr(out)

+}

+

+#[derive(Copy, Clone, Debug)]

+/// Header for PAM images.

+pub struct PAMHeader {

+ pub width: NonZeroU32,

+ pub height: NonZeroU32,

+ /// Channel count

+ pub depth: u8,

+ /// Max value

+ pub max: u8,

+ /// Data type

+ pub tupltype: Type,

+}

+

+/// Tupltype. See [pam wikipedia page](https://en.wikipedia.org/wiki/Netpbm#PAM_graphics_format) for more informaiton.

+#[derive(Copy, Clone, Debug)]

+pub enum Type {

+ /// Black and white bitmap type, corresponding to `BLACKANDWHITE`

+ Bit,

+ /// Grayscale type, corresponds to `GRAYSCALE`

+ Y,

+ RGB,

+ /// Black and white with alpha, `BLACKANDWHITE_ALPHA`

+ BitA,

+ /// Gray with alpha. `GRAYSCALE_ALPHA`

+ YA,

+ RGBA,

+}

+

+impl Type {

+ const fn bytes(self) -> u8 {

+ use Type::*;

+ match self {

+ Bit | Y => 1,

+ BitA | YA => 2,

+ RGB => 3,

+ RGBA => 4,

+ }

+ }

+}

+

+/// Decode a PAM image into a [`DynImage`].

+pub fn decode(mut x: &[u8]) -> Result<DynImage<Vec<u8>>> {

+ crate::decode::magic(&mut x);

+ decode_wo_magic(x)

+}

+

+/// Decode a magicless PAM image.

+pub fn decode_wo_magic(mut x: &[u8]) -> Result<DynImage<Vec<u8>>> {

+ let header = decode_pam_header(&mut x)?;

+ let mut alloc = Vec::with_capacity(

+ header.tupltype.bytes() as usize

+ * header.width.get() as usize

+ * header.height.get() as usize,

+ );

+ let n = unsafe { decode_inner(x, alloc.as_mut_ptr(), header)? };

+ unsafe { alloc.set_len(n) };

+ Ok(match header.tupltype {

+ Type::Bit => unsafe { DynImage::Y(Image::new(header.width, header.height, alloc)) },

+ Type::Y => unsafe { DynImage::Y(Image::new(header.width, header.height, alloc)) },

+ Type::BitA => unsafe { DynImage::Ya(Image::new(header.width, header.height, alloc)) },

+ Type::YA => unsafe { DynImage::Ya(Image::new(header.width, header.height, alloc)) },

+ Type::RGB => unsafe { DynImage::Rgb(Image::new(header.width, header.height, alloc)) },

+ Type::RGBA => unsafe { DynImage::Rgba(Image::new(header.width, header.height, alloc)) },

+ })

+}

+

+/// Decodes this pam image's body, placing it in the raw pointer.

+/// # Safety

+///

+/// buffer must have [`size`] bytes of space.

+pub unsafe fn decode_inner(x: &[u8], mut into: *mut u8, header: PAMHeader) -> Result<usize> {

+ let n = header.tupltype.bytes() as usize

+ * header.width.get() as usize

+ * header.height.get() as usize;

+ match header.tupltype {

+ Type::Bit => x

+ .iter()

+ .map(|&x| x * 0xff)

+ .take(n)

+ .for_each(|x| into.push(x)),

+ Type::BitA => x

+ .iter()

+ .array_chunks::<2>()

+ .take(n)

+ .map(|[&x, &a]| [x * 0xff, a])

+ .for_each(|x| into.put(x)),

+ Type::Y | Type::YA | Type::RGB | Type::RGBA => {

+ into.copy_from(x.as_ptr(), n);

+ }

+ }

+ Ok(n)

+}

+

+/// expects no magic

+pub fn decode_pam_header(x: &mut &[u8]) -> Result<PAMHeader> {

+ macro_rules! test {

+ ($for:literal else $e:ident) => {

+ if x.rd().ok_or(Error::$e)? != *$for {

+ return Err(Error::$e);

+ };

+ };

+ }

+ test![b"WIDTH " else MissingWidth];

+ let width = NonZeroU32::new(read_til(x)?).ok_or(Error::ZeroWidth)?;

+ test![b"HEIGHT " else MissingHeight];

+ let height = NonZeroU32::new(read_til(x)?).ok_or(Error::ZeroHeight)?;

+ width.checked_mul(height).ok_or(Error::TooLarge)?;

+ test![b"DEPTH " else MissingDepth];

+ let depth = read_til::<u8>(x)?;

+ test![b"MAXVAL " else MissingMax];

+ let max = read_til::<u8>(x)?;

+ test![b"TUPLTYPE " else MissingTupltype];

+ let end = x

+ .iter()

+ .position(|&x| x == b'\n')

+ .ok_or(Error::MissingTupltype)?;

+ let tupltype = match &x[..end] {

+ b"BLACKANDWHITE" => Type::Bit,

+ b"BLACKANDWHITE_ALPHA" => Type::BitA,

+ b"GRAYSCALE" => Type::Y,

+ b"GRAYSCALE_ALPHA" => Type::YA,

+ b"RGB" => Type::RGB,

+ b"RGB_ALPHA" => Type::RGBA,

+ _ => return Err(Error::MissingTupltype),

+ };

+ *x = &x[end..];

+ test![b"\nENDHDR\n" else MissingData];

+ Ok(PAMHeader {

+ width,

+ height,

+ depth,

+ max,

+ tupltype,

+ })

+}

+

+#[doc = include_str!("est.md")]

+pub const fn size<T>(x: &[T]) -> usize {

+ 92 + x.len()

+}

+

+#[test]

+fn test_bit() {

+ assert_eq!(

+ PAMBit::encode_bitmap(

+ Image::<_, 1>::build(20, 15).buf(

+ include_bytes!("../tdata/fimg.imgbuf")

+ .iter()

+ .map(|&x| x <= 128)

+ .collect::<Vec<_>>(),

+ ),

+ ),

+ include_bytes!("../tdata/fimg.pam")

+ );

+

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimg.pam"))

+ .unwrap()

+ .buffer(),

+ include_bytes!("../tdata/fimg.imgbuf")

+ );

+}

+

+#[test]

+fn test_y() {

+ assert_eq!(

+ PAM::encode(

+ Image::<_, 1>::build(20, 15).buf(&include_bytes!("../tdata/fimg-gray.imgbuf")[..])

+ ),

+ include_bytes!("../tdata/fimg-gray.pam")

+ );

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimg-gray.pam"))

+ .unwrap()

+ .buffer(),

+ include_bytes!("../tdata/fimg-gray.imgbuf")

+ );

+}

+

+#[test]

+fn test_ya() {

+ assert_eq!(

+ PAM::encode(

+ Image::<_, 2>::build(20, 15)

+ .buf(&include_bytes!("../tdata/fimg-transparent.imgbuf")[..])

+ ),

+ include_bytes!("../tdata/fimg-transparent.pam")

+ );

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimg-transparent.pam"))

+ .unwrap()

+ .buffer(),

+ include_bytes!("../tdata/fimg-transparent.imgbuf")

+ );

+}

+

+#[test]

+fn test_rgb() {

+ assert_eq!(

+ PAM::encode(

+ Image::<_, 3>::build(20, 15).buf(&include_bytes!("../tdata/fimg-rainbow.imgbuf")[..])

+ ),

+ include_bytes!("../tdata/fimg-rainbow.pam")

+ );

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimg-rainbow.pam"))

+ .unwrap()

+ .buffer(),

+ include_bytes!("../tdata/fimg-rainbow.imgbuf")

+ );

+}

+

+#[test]

+fn test_rgba() {

+ assert_eq!(

+ PAM::encode(

+ Image::<_, 4>::build(20, 15)

+ .buf(&include_bytes!("../tdata/fimg-rainbow-transparent.imgbuf")[..])

+ ),

+ include_bytes!("../tdata/fimg-rainbow-transparent.pam")

+ );

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimg-rainbow-transparent.pam"))

+ .unwrap()

+ .buffer(),

+ include_bytes!("../tdata/fimg-rainbow-transparent.imgbuf")

+ );

+}

+//! [Portable BitMap Format](https://en.wikipedia.org/wiki/Netpbm#PBM_example) black and white image encoding and decoding.

+//!

+//! Unstable api.

+pub type Input<'a> = Image<&'a [bool], 1>;

+pub type Output = Image<Vec<bool>, 1>;

+pub type Uninit = fimg::uninit::Image<bool, 1>;

+use crate::encode::{encodeu32, P};

+use atools::prelude::*;

+use fimg::Image;

+

+#[cfg(test)]

+fn tdata() -> Vec<bool> {

+ include_bytes!("../tdata/fimg.imgbuf")

+ .iter()

+ .map(|&x| x <= 128)

+ .collect::<Vec<_>>()

+}

+

+/// Module for handling plain ascii (human readable) [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) (black and white) images.

+pub mod plain {

+ use crate::encode::encode_bool;

+

+ use super::*;

+ pub const MAGIC: u8 = 1;

+

+ /// Encode an <code>[Image]<[bool], 1></code> into a [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) ASCII Image.

+ pub fn encode<T: AsRef<[bool]>>(x: Image<T, 1>) -> String {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ unsafe { String::from_utf8_unchecked(y) }

+ }

+

+ crate::decode::dec_fn! {

+ "Decode an ASCII [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) image into an <code>[Image]<[Box]<[bool]>, 1></code>"

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut bool;

+ let pixels = into.width() * into.height();

+ for &b in x

+ .iter()

+ .filter(|&&x| matches!(x, b'0' | b'1'))

+ .take(pixels as usize)

+ {

+ // SAFETY: iterator over `pixels` elements.

+ unsafe { out.push(b == b'1') };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ /// Converts 0 to 255 and 1 to 0, for your u8 image experience.

+ pub fn decode_body_into_u8(

+ x: &[u8],

+ mut into: fimg::uninit::Image<u8, 1>,

+ ) -> Result<Image<Vec<u8>, 1>> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ for &b in x

+ .iter()

+ .filter(|&&x| matches!(x, b'0' | b'1'))

+ .take(pixels as usize)

+ {

+ // SAFETY: iterator over `pixels` elements.

+ unsafe { out.push((b == b'0') as u8 * 0xff) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.push(b'\n');

+ for row in x.buffer().chunks_exact(x.width() as _) {

+ for &on in row {

+ o.push(encode_bool(on));

+ // cosmetic

+ o.push(b' ');

+ }

+ // cosmetic

+ o.push(b'\n');

+ }

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // P1

+ + 23 // \n4294967295 4294967295\n

+ + x.height() as usize // \n

+ + x.len() * 2 // ' 1'

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_str!("../tdata/fimgA.pbm")

+ );

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgA.pbm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+}

+

+/// Module for handling raw (packed binary) [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) (black and white) images.

+pub mod raw {

+ use super::*;

+ pub const MAGIC: u8 = 4;

+ /// Encode an <code>[Image]<[bool], 1></code> [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) Raw (packed binary) Image.

+ pub fn encode<T: AsRef<[bool]>>(x: Image<T, 1>) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ crate::decode::dec_fn! {

+ "Decode a raw binary [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) image into an <code>[Image]<[Box]<[bool]>, 1></code>"

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.push(b'\n');

+ x.buffer()

+ .chunks_exact(x.width() as _)

+ .flat_map(|x| x.chunks(8))

+ .map(|chunk| {

+ chunk

+ .iter()

+ .copied()

+ .chain(std::iter::repeat(false).take(8 - chunk.len()))

+ .zip(0u8..)

+ .fold(0, |acc, (x, i)| acc | (x as u8) << 7 - i)

+ })

+ .for_each(|x| o.push(x));

+

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut bool;

+ let pixels = into.width() * into.height();

+ let padding = into.width() % 8;

+ for &x in x

+ .iter()

+ .copied()

+ // expand the bits

+ .flat_map(|b| atools::range::<8>().rev().map(|x| b & (1 << x) != 0))

+ // TODO skip?

+ .collect::<Vec<_>>()

+ .chunks_exact((into.width() + padding) as _)

+ .map(|x| &x[..into.width() as _])

+ .take(pixels as _)

+ .flatten()

+ {

+ // SAFETY: took `pixels` pixels.

+ unsafe { out.push(x) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into_u8(

+ x: &[u8],

+ mut into: fimg::uninit::Image<u8, 1>,

+ ) -> Result<Image<Vec<u8>, 1>> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ let padding = into.width() % 8;

+ for x in x

+ .iter()

+ .copied()

+ // expand the bits

+ .flat_map(|b| atools::range::<8>().rev().map(|x| b & (1 << x) == 0))

+ // TODO skip?

+ .collect::<Vec<_>>()

+ .chunks_exact((into.width() + padding) as _)

+ .map(|x| &x[..into.width() as _])

+ .take(pixels as _)

+ .flatten()

+ .map(|&x| x as u8 * 0xff)

+ {

+ // SAFETY: took `pixels` pixels.

+ unsafe { out.push(x) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // magic

+ + 23 // w h

+ + (x.len() / 8) // packed pixels

+ + ((x.width() as usize % 8 != 0) as usize * x.height() as usize) // padding

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgR.pbm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_bytes!("../tdata/fimgR.pbm")

+ );

+ }

+}

+//! [Portable GreyMap Format](https://en.wikipedia.org/wiki/Netpbm#PGM_example) grey image encoding and decoding.

+pub(crate) const CHANNELS: usize = 1;

+pub type Input<'a> = Image<&'a [u8], 1>;

+pub type Output = Image<Vec<u8>, 1>;

+pub type Uninit = fimg::uninit::Image<u8, 1>;

+use crate::encode::{encodeu32, P};

+use atools::prelude::*;

+use fimg::Image;

+

+#[cfg(test)]

+fn tdata() -> &'static [u8] {

+ include_bytes!("../tdata/fimg-gray.imgbuf")

+}

+

+/// Module for handling plain ascii (human readable) [PGM](https://en.wikipedia.org/wiki/Netpbm#PGM_example) (Y) images.

+pub mod plain {

+

+ use crate::encode::encode_;

+

+ use super::*;

+ pub const MAGIC: u8 = 2;

+

+ /// Encode an <code>[Image]<[u8], 1></code> into a [PBM](https://en.wikipedia.org/wiki/Netpbm#PBM_example) ASCII Image.

+ pub fn encode<T: AsRef<[u8]>>(x: Image<T, 1>) -> String {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ unsafe { String::from_utf8_unchecked(y) }

+ }

+

+ crate::decode::dec_fn! {

+ max "Decode an ASCII [PGM](https://en.wikipedia.org/wiki/Netpbm#PGM_example) image into an <code>[Image]<[Box]<[u8]>, 1></code>"

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit, max: u8) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ for b in x

+ .split(u8::is_ascii_whitespace)

+ .filter(|x| !x.is_empty() && x.len() <= 3)

+ .filter(|x| x.iter().all(u8::is_ascii_digit))

+ .map(|x| x.iter().fold(0, |acc, &x| acc * 10 + (x - b'0')))

+ .map(|x| {

+ if max == 255 {

+ x

+ } else {

+ ((x as f32 / max as f32) * 255.) as u8

+ }

+ })

+ .take(pixels as usize)

+ {

+ // SAFETY: iterator over `pixels` elements.

+ unsafe { out.push(b) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.put(*b" 255\n");

+ for row in x.buffer().chunks_exact(x.width() as _) {

+ for &on in row {

+ o.put(encode_(on));

+ }

+ // cosmetic

+ o.push(b'\n');

+ }

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // P1

+ + 23 // \n4294967295 4294967295\n

+ + x.height() as usize // \n

+ + x.len() * 4 // '255 '

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_str!("../tdata/fimgA.pgm")

+ );

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgA.pgm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+}

+

+/// Module for handling raw (binary) [PGM](https://en.wikipedia.org/wiki/Netpbm#PGM_example) (gray) images.

+pub mod raw {

+ use super::*;

+ pub const MAGIC: u8 = 5;

+ /// Encode an <code>[Image]<[u8], 1></code> [PBM](https://en.wikipedia.org/wiki/Netpbm#PGM_example) Raw (binary) Image.

+ pub fn encode<T: AsRef<[u8]>>(x: Image<T, 1>) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ crate::decode::dec_fn! {

+ "Decode a raw binary [PGM](https://en.wikipedia.org/wiki/Netpbm#PGM_example) image into an <code>[Image]<[Box]<[u8]>, 1></code>"

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.put(*b" 255\n");

+ for &x in *x.buffer() {

+ o.push(x)

+ }

+

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ for b in x.iter().copied().take(pixels as _) {

+ // SAFETY: took `pixels` pixels.

+ unsafe { out.push(b) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < pixels as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // magic

+ + 23 // w h

+ + x.len() // data

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgR.pgm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_bytes!("../tdata/fimgR.pgm")

+ );

+ }

+}

+//! [Portable PixMap Format](https://en.wikipedia.org/wiki/Netpbm#PPM_example) RGB (no alpha) image encoding and decoding.

+pub(crate) const CHANNELS: usize = 3;

+pub type Input<'a> = Image<&'a [u8], 3>;

+pub type Output = Image<Vec<u8>, 3>;

+pub type Uninit = fimg::uninit::Image<u8, 3>;

+use crate::encode::{encodeu32, P};

+use atools::prelude::*;

+use fimg::Image;

+

+#[cfg(test)]

+fn tdata() -> &'static [u8] {

+ include_bytes!("../tdata/fimg-rainbow.imgbuf")

+}

+

+/// Module for handling plain ascii (human readable) [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) (Y) images.

+pub mod plain {

+ use crate::encode::encode_;

+

+ use super::*;

+ pub const MAGIC: u8 = 3;

+

+ /// Encode an <code>[Image]<[u8], 3></code> into a [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) ASCII Image.

+ pub fn encode<T: AsRef<[u8]>>(x: Image<T, 3>) -> String {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ unsafe { String::from_utf8_unchecked(y) }

+ }

+

+ crate::decode::dec_fn! {

+ max "Decode an ASCII [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) image into an <code>[Image]<[Box]<[u8]>, 3></code>"

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit, max: u8) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ for b in x

+ .split(u8::is_ascii_whitespace)

+ .filter(|x| !x.is_empty() && x.len() <= 3)

+ .filter(|x| x.iter().all(u8::is_ascii_digit))

+ .map(|x| x.iter().fold(0, |acc, &x| acc * 10 + (x - b'0')))

+ .map(|x| {

+ if max == 255 {

+ x

+ } else {

+ ((x as f32 / max as f32) * 255.) as u8

+ }

+ })

+ .array_chunks::<3>()

+ .take(pixels as usize)

+ {

+ // SAFETY: iterator over `pixels` elements.

+ unsafe { out.put(b) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < (pixels * 3) as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.put(*b" 255\n");

+ for row in x.flatten().chunks_exact(x.width() as _) {

+ for &on in row.iter().flatten() {

+ o.put(encode_(on));

+ }

+ // cosmetic

+ o.push(b'\n');

+ }

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // P1

+ + 23 // \n4294967295 4294967295\n

+ + x.height() as usize // \n

+ + x.len() * 4 // '255 '

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_str!("../tdata/fimgA.ppm")

+ );

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgA.ppm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+}

+

+/// Module for handling raw (binary) [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) (rgb) images.

+pub mod raw {

+ use super::*;

+ pub const MAGIC: u8 = 6;

+ /// Encode an <code>[Image]<[u8], 3></code> [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) Raw (binary) Image.

+ pub fn encode<T: AsRef<[u8]>>(x: Image<T, 3>) -> Vec<u8> {

+ let mut y = Vec::with_capacity(size(x.as_ref()));

+ let n = unsafe { encode_into(x.as_ref(), y.as_mut_ptr()) };

+ unsafe { y.set_len(n) };

+ y

+ }

+

+ crate::decode::dec_fn! {

+ "Decode a raw binary [PPM](https://en.wikipedia.org/wiki/Netpbm#PPM_example) image into an <code>[Image]<[Box]<[u8]>, 3></code>"

+ }

+

+ #[doc = include_str!("encode_into.md")]

+ pub unsafe fn encode_into(x: Input, out: *mut u8) -> usize {

+ let mut o = out;

+ o.put(b'P'.join(MAGIC + b'0'));

+ o.push(b' ');

+ encodeu32(x.width(), &mut o);

+ o.push(b' ');

+ encodeu32(x.height(), &mut o);

+ o.put(*b" 255\n");

+ for &x in *x.buffer() {

+ o.push(x)

+ }

+

+ o.sub_ptr(out)

+ }

+

+ #[doc = include_str!("decode_body_into.md")]

+ pub fn decode_body_into(x: &[u8], mut into: Uninit) -> Result<Output> {

+ let mut out = into.buf().as_mut_ptr() as *mut u8;

+ let pixels = into.width() * into.height();

+ for b in x.iter().copied().array_chunks::<3>().take(pixels as _) {

+ // SAFETY: took `pixels` pixels.

+ unsafe { out.put(b) };

+ }

+ if unsafe { out.sub_ptr(into.buf().as_mut_ptr().cast()) < (pixels * 3) as usize } {

+ return Err(Error::MissingData);

+ }

+ // SAFETY: checked that the pixels have been initialized.

+ Ok(unsafe { into.assume_init() })

+ }

+

+ #[doc = include_str!("est.md")]

+ pub fn size(x: Input) -> usize {

+ 2 // magic

+ + 23 // w h

+ + x.len() // data

+ }

+

+ #[test]

+ fn test_decode() {

+ assert_eq!(

+ &**decode(include_bytes!("../tdata/fimgR.ppm"))

+ .unwrap()

+ .buffer(),

+ tdata()

+ )

+ }

+

+ #[test]

+ fn test_encode() {

+ assert_eq!(

+ encode(Image::build(20, 15).buf(tdata())),

+ include_bytes!("../tdata/fimgR.ppm")

+ );

+ }

+}

+P1 20 15

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0 0 1 1

+1 1 1 0 1 1 1 1 0 1 0 1 0 1 0 1 1 0 1 1

+1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1

+1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1 1

+1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

+P2 20 15 255

+162 152 143 133 124 114 105 95 86 77 67 58 48 39 29 20 11 1 0 0

+161 152 142 133 123 114 105 95 86 76 67 57 48 38 29 20 10 1 0 0

+161 151 142 255 255 255 255 95 85 76 66 57 47 38 29 19 10 0 0 0

+160 151 142 255 123 113 104 94 85 75 66 57 47 38 28 19 9 0 0 0

+160 151 141 255 122 113 103 94 84 75 66 56 47 37 28 18 9 0 0 0

+160 150 255 255 255 112 255 94 255 255 255 255 255 37 255 255 255 255 0 0

+159 150 140 255 121 112 103 93 255 74 255 55 255 36 255 0 0 255 0 0

+159 149 140 255 121 112 255 93 255 74 255 55 255 36 255 0 0 255 0 0

+158 149 140 255 121 111 255 92 255 73 255 55 255 36 255 0 0 255 0 0

+158 149 139 255 120 111 255 92 255 73 255 54 255 35 255 255 255 255 0 0

+158 148 139 129 120 110 101 92 82 73 63 54 44 35 25 16 7 255 0 0

+157 148 138 129 119 110 101 91 82 72 63 53 44 35 25 16 6 255 0 0

+157 147 138 129 119 110 100 91 81 72 62 53 44 34 255 255 255 255 0 0

+156 147 138 128 119 109 100 90 81 71 62 53 43 34 24 15 5 0 0 0

+156 147 137 128 118 109 99 90 81 71 62 52 43 33 24 14 5 0 0 0

+P3 20 15 255

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 255 115 0 255 115 0 255 115 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 255 0 14 255 0 14 255 115 0 0 0 0 255 115 0 0 0 0 250 210 32 250 210 32 19 143 62 19 143 62 19 143 62 0 0 0 53 88 160 53 88 160 136 0 130 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 0 0 0 0 0 0 250 210 32 0 0 0 19 143 62 0 0 0 19 143 62 0 0 0 53 88 160 0 0 0 0 0 0 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 255 115 0 0 0 0 250 210 32 0 0 0 19 143 62 0 0 0 19 143 62 0 0 0 53 88 160 0 0 0 0 0 0 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 255 115 0 0 0 0 250 210 32 0 0 0 19 143 62 0 0 0 19 143 62 0 0 0 53 88 160 0 0 0 0 0 0 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 255 0 14 0 0 0 0 0 0 255 115 0 0 0 0 250 210 32 0 0 0 19 143 62 0 0 0 19 143 62 0 0 0 53 88 160 53 88 160 136 0 130 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 53 88 160 53 88 160 136 0 130 136 0 130 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

+P4 20 15

+����������������0�U��U��U��T0��������0������ \ No newline at end of file