pic_scale/colors/
xyz_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::{
30    SRGB_TO_XYZ_D65, TransferFunction, XYZ_TO_SRGB_D65, rgba_to_xyz_with_alpha, srgb_to_xyz,
31    xyz_to_srgb, xyz_with_alpha_to_rgba,
32};
33use std::sync::Arc;
34
35use crate::colors::common_splitter::{SplitPlanInterceptor, Splitter};
36use crate::plan::Resampling;
37use crate::validation::PicScaleError;
38use crate::{ImageSize, ImageStore, ImageStoreMut, ResamplingFunction, Scaler, ThreadingPolicy};
39
40#[derive(Debug, Copy, Clone)]
41/// Converts image to CIE XYZ components scales it and convert back
42pub struct XYZScaler {
43    pub(crate) scaler: Scaler,
44}
45
46impl XYZScaler {
47    pub fn new(filter: ResamplingFunction) -> Self {
48        XYZScaler {
49            scaler: Scaler::new(filter),
50        }
51    }
52}
53
54struct XyzRgbSplitter {}
55
56impl Splitter<u8, f32, 3> for XyzRgbSplitter {
57    fn split(&self, from: &ImageStore<'_, u8, 3>, into: &mut ImageStoreMut<'_, f32, 3>) {
58        let lab_stride = into.width as u32 * 3u32 * size_of::<f32>() as u32;
59
60        srgb_to_xyz(
61            from.buffer.as_ref(),
62            from.width as u32 * 3u32,
63            into.buffer.borrow_mut(),
64            lab_stride,
65            into.width as u32,
66            into.height as u32,
67        );
68    }
69
70    fn merge(&self, from: &ImageStore<'_, f32, 3>, into: &mut ImageStoreMut<'_, u8, 3>) {
71        let new_lab_stride = into.width as u32 * 3 * size_of::<f32>() as u32;
72        xyz_to_srgb(
73            from.buffer.as_ref(),
74            new_lab_stride,
75            into.buffer.borrow_mut(),
76            into.width as u32 * 3,
77            into.width as u32,
78            into.height as u32,
79        );
80    }
81
82    fn bit_depth(&self) -> usize {
83        8
84    }
85}
86
87struct XyzRgbaSplitter {}
88
89impl Splitter<u8, f32, 4> for XyzRgbaSplitter {
90    fn split(&self, from: &ImageStore<'_, u8, 4>, into: &mut ImageStoreMut<'_, f32, 4>) {
91        let lab_stride = into.width as u32 * 4u32 * size_of::<f32>() as u32;
92
93        rgba_to_xyz_with_alpha(
94            from.buffer.as_ref(),
95            from.width as u32 * 4u32,
96            into.buffer.borrow_mut(),
97            lab_stride,
98            into.width as u32,
99            into.height as u32,
100            &SRGB_TO_XYZ_D65,
101            TransferFunction::Srgb,
102        );
103    }
104
105    fn merge(&self, from: &ImageStore<'_, f32, 4>, into: &mut ImageStoreMut<'_, u8, 4>) {
106        let new_lab_stride = into.width as u32 * 4 * size_of::<f32>() as u32;
107        xyz_with_alpha_to_rgba(
108            from.buffer.as_ref(),
109            new_lab_stride,
110            into.buffer.borrow_mut(),
111            into.width as u32 * 4,
112            into.width as u32,
113            into.height as u32,
114            &XYZ_TO_SRGB_D65,
115            TransferFunction::Srgb,
116        );
117    }
118
119    fn bit_depth(&self) -> usize {
120        8
121    }
122}
123
124impl XYZScaler {
125    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) {
126        self.scaler.threading_policy = threading_policy;
127    }
128
129    pub fn plan_rgb_resampling(
130        &self,
131        source_size: ImageSize,
132        target_size: ImageSize,
133    ) -> Result<Arc<Resampling<u8, 3>>, PicScaleError> {
134        let intercept = self
135            .scaler
136            .plan_rgb_resampling_f32(source_size, target_size)?;
137        let scratch_size = intercept.scratch_size();
138        Ok(Arc::new(SplitPlanInterceptor {
139            intercept,
140            splitter: Arc::new(XyzRgbSplitter {}),
141            inner_scratch: scratch_size,
142        }))
143    }
144
145    pub fn plan_rgba_resampling(
146        &self,
147        source_size: ImageSize,
148        target_size: ImageSize,
149        premultiply_alpha: bool,
150    ) -> Result<Arc<Resampling<u8, 4>>, PicScaleError> {
151        let intercept =
152            self.scaler
153                .plan_rgba_resampling_f32(source_size, target_size, premultiply_alpha)?;
154        let scratch_size = intercept.scratch_size();
155        Ok(Arc::new(SplitPlanInterceptor {
156            intercept,
157            splitter: Arc::new(XyzRgbaSplitter {}),
158            inner_scratch: scratch_size,
159        }))
160    }
161}
pic_scale/colors/xyz_scaler.rs

pic_scale/colors/
xyz_scaler.rs
