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use super::{
color::{RGBPrimaries, TransformFn},
transform::ColorTransform,
xyz::{rgb_to_xyz, xyz_to_rgb},
};
use crate::{ColorSpace, FType, Mat3, Vec3};
#[cfg(feature = "serde1")]
use serde::{Deserialize, Serialize};
#[derive(Copy, Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub struct LinearColorConversion {
mat: Mat3,
input_space: ColorSpace,
output_space: ColorSpace,
}
impl LinearColorConversion {
pub fn input_space(&self) -> ColorSpace {
self.input_space
}
pub fn output_space(&self) -> ColorSpace {
self.output_space
}
pub fn apply(&self, color: &mut Vec3) {
*color = self.mat * *color;
}
pub fn matrix(&self) -> Mat3 {
self.mat
}
pub fn new(src: ColorSpace, dst: ColorSpace) -> Self {
if !src.is_linear() {
panic!("{:?} is not a linear color space", src);
}
if !dst.is_linear() {
panic!("{:?} is not a linear color space", dst);
}
#[cfg(feature = "color-matrices")]
let const_conversion = super::generated_matrices::const_conversion_matrix(
src.primaries(),
src.white_point(),
dst.primaries(),
dst.white_point(),
);
#[cfg(not(feature = "color-matrices"))]
let const_conversion: Option<Mat3> = None;
let mat = if let Some(const_mat) = const_conversion {
const_mat
} else {
let src_to_xyz = if src.primaries() == RGBPrimaries::CIE_XYZ {
Mat3::IDENTITY
} else {
rgb_to_xyz(src.primaries().values(), src.white_point().values())
};
let xyz_to_dst = if dst.primaries() == RGBPrimaries::CIE_XYZ {
Mat3::IDENTITY
} else {
xyz_to_rgb(dst.primaries().values(), dst.white_point().values())
};
if src.white_point() != dst.white_point() {
let white_point_transform = super::cat::chromatic_adaptation_transform(
Vec3::from_slice_unaligned(src.white_point().values()),
Vec3::from_slice_unaligned(dst.white_point().values()),
super::cat::LMSConeSpace::Sharp,
);
xyz_to_dst * white_point_transform * src_to_xyz
} else {
xyz_to_dst * src_to_xyz
}
};
Self {
mat,
input_space: src,
output_space: dst,
}
}
}
#[derive(Copy, Clone)]
pub struct ColorConversion {
src_space: ColorSpace,
dst_space: ColorSpace,
src_transform: Option<ColorTransform>,
linear_transform: Option<LinearColorConversion>,
dst_transform: Option<ColorTransform>,
}
impl PartialEq for ColorConversion {
fn eq(&self, other: &Self) -> bool {
self.src_space == other.src_space && self.dst_space == other.dst_space
}
}
impl core::fmt::Debug for ColorConversion {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
let src_transform = if !self.src_space.is_linear() {
self.src_space.transform_function()
} else {
TransformFn::NONE
};
let dst_transform = if !self.dst_space.is_linear() {
self.dst_space.transform_function()
} else {
TransformFn::NONE
};
f.debug_struct("ColorConversion")
.field("src_space", &self.src_space)
.field("dst_space", &self.dst_space)
.field("src_transform", &src_transform)
.field("linear_transform", &self.linear_transform)
.field("dst_transform", &dst_transform)
.finish()
}
}
impl ColorConversion {
pub fn new(src: ColorSpace, dst: ColorSpace) -> Self {
let src_transform = if !src.is_linear() {
ColorTransform::new(src.transform_function(), TransformFn::NONE)
} else {
None
};
let src_linear = ColorSpace::linear(src.primaries(), src.white_point());
let dst_linear = ColorSpace::linear(dst.primaries(), dst.white_point());
let linear_transform = LinearColorConversion::new(src_linear, dst_linear);
let linear_transform = if linear_transform.mat == Mat3::IDENTITY {
None
} else {
Some(linear_transform)
};
let dst_transform = if !dst.is_linear() {
ColorTransform::new(TransformFn::NONE, dst.transform_function())
} else {
None
};
Self {
src_space: src,
dst_space: dst,
src_transform,
dst_transform,
linear_transform,
}
}
pub fn invert(&self) -> Self {
ColorConversion::new(self.dst_space, self.src_space)
}
pub fn is_linear(&self) -> bool {
self.src_transform.is_none() && self.dst_transform.is_none()
}
pub fn linear_part(&self) -> LinearColorConversion {
if let Some(transform) = self.linear_transform.as_ref() {
*transform
} else {
LinearColorConversion {
input_space: self.src_space,
output_space: self.dst_space,
mat: Mat3::IDENTITY,
}
}
}
pub fn src_transform(&self) -> TransformFn {
self.src_transform
.map(|_| self.src_space.transform_function())
.unwrap_or(TransformFn::NONE)
}
pub fn dst_transform(&self) -> TransformFn {
self.dst_transform
.map(|_| self.dst_space.transform_function())
.unwrap_or(TransformFn::NONE)
}
pub fn src_space(&self) -> ColorSpace {
self.src_space
}
pub fn dst_space(&self) -> ColorSpace {
self.dst_space
}
pub fn apply_float(&self, color: &mut [FType; 3]) {
let mut vec3 = Vec3::from_slice_unaligned(color);
self.apply(&mut vec3);
*color = vec3.into();
}
pub fn apply(&self, color: &mut Vec3) {
if let Some(src_transform) = self.src_transform.as_ref() {
src_transform.apply(color, self.src_space.white_point());
}
if let Some(transform) = self.linear_transform.as_ref() {
transform.apply(color);
}
if let Some(dst_transform) = self.dst_transform.as_ref() {
dst_transform.apply(color, self.dst_space.white_point());
}
}
}