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// SPDX-License-Identifier: LGPL-3.0-or-later
/*
* libopenraw - mosaic.rs
*
* Copyright (C) 2023-2024 Hubert Figuière
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
//! CFA Mosaic
use num_enum::TryFromPrimitive;
/// C friendly enum for Pattern types.
#[repr(u8)]
pub enum PatternType {
None = 0,
NonRgb22 = 1,
Rggb = 2,
Gbrg = 3,
Bggr = 4,
Grbg = 5,
}
impl From<&Pattern> for PatternType {
fn from(value: &Pattern) -> PatternType {
match *value {
Pattern::Empty => PatternType::None,
Pattern::NonRgb22(_) => PatternType::NonRgb22,
Pattern::Rggb => PatternType::Rggb,
Pattern::Gbrg => PatternType::Gbrg,
Pattern::Bggr => PatternType::Bggr,
Pattern::Grbg => PatternType::Grbg,
}
}
}
/// A pattern colour component.
#[derive(Clone, Copy, Debug, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum PatternColour {
Red = 0,
Green = 1,
Blue = 2,
}
impl PatternColour {
pub fn to_char(self) -> char {
match self {
Self::Red => 'R',
Self::Green => 'G',
Self::Blue => 'B',
}
}
}
/// Describe a pattern
#[derive(Clone, Debug, Default, PartialEq)]
pub enum Pattern {
/// Empty pattern. Most case it's an error.
#[default]
Empty,
/// Non RGB22. Like X-Trans, the data is the actual pattern.
NonRgb22(Vec<PatternColour>),
/// RGGB 2x2 bayer
Rggb,
/// GBRG 2x2 bayer
Gbrg,
/// BGGR 2x2 bayer
Bggr,
/// GRBG 2x2 bayer
Grbg,
}
impl std::fmt::Display for Pattern {
/// `Display` will print a string of the pattern colour filters
/// left - right & top - bottom
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}",
match *self {
Self::Empty => "NONE",
Self::Rggb => "RGGB",
Self::Gbrg => "GBRG",
Self::Bggr => "BGGR",
Self::Grbg => "GRBG",
Self::NonRgb22(_) => "NON_RGB22",
//p.iter().map(|c| c.to_char()).collect(),
}
)
}
}
impl std::convert::TryFrom<&[u8]> for Pattern {
type Error = &'static str;
fn try_from(v: &[u8]) -> Result<Pattern, Self::Error> {
use PatternColour::*;
if v.len() == 4 {
if v == [Red as u8, Green as u8, Green as u8, Blue as u8] {
Ok(Self::Rggb)
} else if v == [Green as u8, Blue as u8, Red as u8, Green as u8] {
Ok(Self::Gbrg)
} else if v == [Green as u8, Red as u8, Blue as u8, Green as u8] {
Ok(Self::Grbg)
} else if v == [Blue as u8, Green as u8, Green as u8, Red as u8] {
Ok(Self::Bggr)
} else {
Err("Invalid pattern")
}
} else {
let colours: Vec<PatternColour> = v
.iter()
.map(|colour| PatternColour::try_from_primitive(*colour))
.take_while(Result::is_ok)
.map(|v| v.unwrap())
.collect();
if colours.len() == v.len() {
Ok(Self::NonRgb22(colours))
} else {
Err("Invalid colour found")
}
}
}
}
impl Pattern {
/// Return a `PatternType`, mostly for C API.
pub fn pattern_type(&self) -> PatternType {
self.into()
}
/// Return the pattern colour array
pub fn pattern(&self) -> Vec<PatternColour> {
use PatternColour::*;
match *self {
Self::Empty => Vec::default(),
Self::Rggb => vec![Red, Green, Green, Blue],
Self::Gbrg => vec![Green, Blue, Red, Green],
Self::Bggr => vec![Blue, Green, Green, Red],
Self::Grbg => vec![Green, Red, Blue, Green],
Self::NonRgb22(ref p) => p.clone(),
}
}
}
#[cfg(test)]
mod test {
use std::convert::TryFrom;
use super::Pattern;
use super::PatternColour::*;
#[test]
fn test_pattern_to_string() {
let pattern = Pattern::default();
assert_eq!(&pattern.to_string(), "NONE");
let pattern = Pattern::Rggb;
assert_eq!(&pattern.to_string(), "RGGB");
let pattern = Pattern::NonRgb22(vec![Red, Green, Blue, Blue, Red, Green, Green, Blue, Red]);
assert_eq!(&pattern.to_string(), "NON_RGB22");
}
#[test]
fn test_pattern_try_from() {
// Valid 2x2 pattern
let pattern = vec![Red as u8, Green as u8, Green as u8, Blue as u8];
assert_eq!(Pattern::try_from(pattern.as_slice()), Ok(Pattern::Rggb));
// Invalid 2x2 pattern
let pattern = vec![Green as u8, Green as u8, Red as u8, Blue as u8];
assert!(Pattern::try_from(pattern.as_slice()).is_err());
// Valid non 2x2 pattern
let pattern = vec![
Red as u8,
Green as u8,
Green as u8,
Blue as u8,
Red as u8,
Green as u8,
Green as u8,
Blue as u8,
];
assert_eq!(
Pattern::try_from(pattern.as_slice()),
Ok(Pattern::NonRgb22(vec![
Red, Green, Green, Blue, Red, Green, Green, Blue
]))
);
// Test we return an error if one of the component is invalid
let pattern = vec![
Red as u8,
Green as u8,
100,
Blue as u8,
Red as u8,
Green as u8,
Green as u8,
Blue as u8,
];
assert!(Pattern::try_from(pattern.as_slice()).is_err());
}
}
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