pic_scale/colors/
oklab_scaler.rs

1/*
2 * Copyright (c) Radzivon Bartoshyk. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 *
7 * 1.  Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * 2.  Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * 3.  Neither the name of the copyright holder nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29use colorutils_rs::{TransferFunction, oklab_to_rgb, oklab_to_rgba, rgb_to_oklab, rgba_to_oklab};
30use std::sync::Arc;
31
32use crate::colors::common_splitter::{SplitPlanInterceptor, Splitter};
33use crate::plan::Resampling;
34use crate::validation::PicScaleError;
35use crate::{ImageSize, ImageStore, ImageStoreMut, ResamplingFunction, Scaler, ThreadingPolicy};
36
37#[derive(Debug, Copy, Clone)]
38/// Converts image to *Oklab* components scales it and convert back
39pub struct OklabScaler {
40    pub(crate) scaler: Scaler,
41    pub(crate) transfer_function: TransferFunction,
42}
43
44impl OklabScaler {
45    /// # Arguments
46    /// - `transfer_function` - Transfer function to move into linear colorspace and back
47    pub fn new(filter: ResamplingFunction, transfer_function: TransferFunction) -> Self {
48        OklabScaler {
49            scaler: Scaler::new(filter),
50            transfer_function,
51        }
52    }
53}
54
55struct OklabRgbSplitter {
56    transfer_function: TransferFunction,
57}
58
59impl Splitter<u8, f32, 3> for OklabRgbSplitter {
60    fn split(
61        &self,
62        from: &ImageStore<'_, u8, 3>,
63        into: &mut ImageStoreMut<'_, f32, 3>,
64    ) -> Result<(), PicScaleError> {
65        let mut dst_buffer = into.to_colorutils_buffer_mut();
66
67        rgb_to_oklab(
68            &from.to_colorutils_buffer(),
69            &mut dst_buffer,
70            self.transfer_function,
71        )
72        .map_err(|x| PicScaleError::Generic(x.to_string()))
73    }
74
75    fn merge(
76        &self,
77        from: &ImageStore<'_, f32, 3>,
78        into: &mut ImageStoreMut<'_, u8, 3>,
79    ) -> Result<(), PicScaleError> {
80        let mut dst_buffer = into.to_colorutils_buffer_mut();
81        oklab_to_rgb(
82            &from.to_colorutils_buffer(),
83            &mut dst_buffer,
84            self.transfer_function,
85        )
86        .map_err(|x| PicScaleError::Generic(x.to_string()))
87    }
88
89    fn bit_depth(&self) -> usize {
90        8
91    }
92}
93
94struct OklabRgbaSplitter {
95    transfer_function: TransferFunction,
96}
97
98impl Splitter<u8, f32, 4> for OklabRgbaSplitter {
99    fn split(
100        &self,
101        from: &ImageStore<'_, u8, 4>,
102        into: &mut ImageStoreMut<'_, f32, 4>,
103    ) -> Result<(), PicScaleError> {
104        let mut dst_buffer = into.to_colorutils_buffer_mut();
105
106        rgba_to_oklab(
107            &from.to_colorutils_buffer(),
108            &mut dst_buffer,
109            self.transfer_function,
110        )
111        .map_err(|x| PicScaleError::Generic(x.to_string()))
112    }
113
114    fn merge(
115        &self,
116        from: &ImageStore<'_, f32, 4>,
117        into: &mut ImageStoreMut<'_, u8, 4>,
118    ) -> Result<(), PicScaleError> {
119        let mut dst_buffer = into.to_colorutils_buffer_mut();
120        oklab_to_rgba(
121            &from.to_colorutils_buffer(),
122            &mut dst_buffer,
123            self.transfer_function,
124        )
125        .map_err(|x| PicScaleError::Generic(x.to_string()))
126    }
127
128    fn bit_depth(&self) -> usize {
129        8
130    }
131}
132
133impl OklabScaler {
134    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) -> Self {
135        self.scaler.threading_policy = threading_policy;
136        *self
137    }
138
139    pub fn plan_rgb_resampling(
140        &self,
141        source_size: ImageSize,
142        target_size: ImageSize,
143    ) -> Result<Arc<Resampling<u8, 3>>, PicScaleError> {
144        let intercept = self
145            .scaler
146            .plan_rgb_resampling_f32(source_size, target_size)?;
147        let scratch_size = intercept.scratch_size();
148        Ok(Arc::new(SplitPlanInterceptor {
149            intercept,
150            splitter: Arc::new(OklabRgbSplitter {
151                transfer_function: self.transfer_function,
152            }),
153            inner_scratch: scratch_size,
154        }))
155    }
156
157    pub fn plan_rgba_resampling(
158        &self,
159        source_size: ImageSize,
160        target_size: ImageSize,
161        premultiply_alpha: bool,
162    ) -> Result<Arc<Resampling<u8, 4>>, PicScaleError> {
163        let intercept =
164            self.scaler
165                .plan_rgba_resampling_f32(source_size, target_size, premultiply_alpha)?;
166        let scratch_size = intercept.scratch_size();
167        Ok(Arc::new(SplitPlanInterceptor {
168            intercept,
169            splitter: Arc::new(OklabRgbaSplitter {
170                transfer_function: self.transfer_function,
171            }),
172            inner_scratch: scratch_size,
173        }))
174    }
175}
pic_scale/colors/oklab_scaler.rs

pic_scale/colors/
oklab_scaler.rs
