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(&self, from: &ImageStore<'_, u8, 3>, into: &mut ImageStoreMut<'_, f32, 3>) {
61        let lab_stride = into.width as u32 * 3u32 * size_of::<f32>() as u32;
62
63        rgb_to_oklab(
64            from.buffer.as_ref(),
65            from.width as u32 * 3u32,
66            into.buffer.borrow_mut(),
67            lab_stride,
68            into.width as u32,
69            into.height as u32,
70            self.transfer_function,
71        );
72    }
73
74    fn merge(&self, from: &ImageStore<'_, f32, 3>, into: &mut ImageStoreMut<'_, u8, 3>) {
75        let new_lab_stride = into.width as u32 * 3 * size_of::<f32>() as u32;
76        oklab_to_rgb(
77            from.buffer.as_ref(),
78            new_lab_stride,
79            into.buffer.borrow_mut(),
80            into.width as u32 * 3,
81            into.width as u32,
82            into.height as u32,
83            self.transfer_function,
84        );
85    }
86
87    fn bit_depth(&self) -> usize {
88        8
89    }
90}
91
92struct OklabRgbaSplitter {
93    transfer_function: TransferFunction,
94}
95
96impl Splitter<u8, f32, 4> for OklabRgbaSplitter {
97    fn split(&self, from: &ImageStore<'_, u8, 4>, into: &mut ImageStoreMut<'_, f32, 4>) {
98        let lab_stride = into.width as u32 * 4u32 * size_of::<f32>() as u32;
99
100        rgba_to_oklab(
101            from.buffer.as_ref(),
102            from.width as u32 * 4u32,
103            into.buffer.borrow_mut(),
104            lab_stride,
105            into.width as u32,
106            into.height as u32,
107            self.transfer_function,
108        );
109    }
110
111    fn merge(&self, from: &ImageStore<'_, f32, 4>, into: &mut ImageStoreMut<'_, u8, 4>) {
112        let new_lab_stride = into.width as u32 * 4 * size_of::<f32>() as u32;
113        oklab_to_rgba(
114            from.buffer.as_ref(),
115            new_lab_stride,
116            into.buffer.borrow_mut(),
117            into.width as u32 * 4,
118            into.width as u32,
119            into.height as u32,
120            self.transfer_function,
121        );
122    }
123
124    fn bit_depth(&self) -> usize {
125        8
126    }
127}
128
129impl OklabScaler {
130    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) -> Self {
131        self.scaler.threading_policy = threading_policy;
132        *self
133    }
134
135    pub fn plan_rgb_resampling(
136        &self,
137        source_size: ImageSize,
138        target_size: ImageSize,
139    ) -> Result<Arc<Resampling<u8, 3>>, PicScaleError> {
140        let intercept = self
141            .scaler
142            .plan_rgb_resampling_f32(source_size, target_size)?;
143        let scratch_size = intercept.scratch_size();
144        Ok(Arc::new(SplitPlanInterceptor {
145            intercept,
146            splitter: Arc::new(OklabRgbSplitter {
147                transfer_function: self.transfer_function,
148            }),
149            inner_scratch: scratch_size,
150        }))
151    }
152
153    pub fn plan_rgba_resampling(
154        &self,
155        source_size: ImageSize,
156        target_size: ImageSize,
157        premultiply_alpha: bool,
158    ) -> Result<Arc<Resampling<u8, 4>>, PicScaleError> {
159        let intercept =
160            self.scaler
161                .plan_rgba_resampling_f32(source_size, target_size, premultiply_alpha)?;
162        let scratch_size = intercept.scratch_size();
163        Ok(Arc::new(SplitPlanInterceptor {
164            intercept,
165            splitter: Arc::new(OklabRgbaSplitter {
166                transfer_function: self.transfer_function,
167            }),
168            inner_scratch: scratch_size,
169        }))
170    }
171}
pic_scale/colors/oklab_scaler.rs

pic_scale/colors/
oklab_scaler.rs
