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(
58        &self,
59        from: &ImageStore<'_, u8, 3>,
60        into: &mut ImageStoreMut<'_, f32, 3>,
61    ) -> Result<(), PicScaleError> {
62        let mut dst_buffer = into.to_colorutils_buffer_mut();
63        srgb_to_xyz(&from.to_colorutils_buffer(), &mut dst_buffer)
64            .map_err(|x| PicScaleError::Generic(x.to_string()))
65    }
66
67    fn merge(
68        &self,
69        from: &ImageStore<'_, f32, 3>,
70        into: &mut ImageStoreMut<'_, u8, 3>,
71    ) -> Result<(), PicScaleError> {
72        let mut dst_buffer = into.to_colorutils_buffer_mut();
73        xyz_to_srgb(&from.to_colorutils_buffer(), &mut dst_buffer)
74            .map_err(|x| PicScaleError::Generic(x.to_string()))
75    }
76
77    fn bit_depth(&self) -> usize {
78        8
79    }
80}
81
82struct XyzRgbaSplitter {}
83
84impl Splitter<u8, f32, 4> for XyzRgbaSplitter {
85    fn split(
86        &self,
87        from: &ImageStore<'_, u8, 4>,
88        into: &mut ImageStoreMut<'_, f32, 4>,
89    ) -> Result<(), PicScaleError> {
90        let mut dst_buffer = into.to_colorutils_buffer_mut();
91
92        rgba_to_xyz_with_alpha(
93            &from.to_colorutils_buffer(),
94            &mut dst_buffer,
95            &SRGB_TO_XYZ_D65,
96            TransferFunction::Srgb,
97        )
98        .map_err(|x| PicScaleError::Generic(x.to_string()))
99    }
100
101    fn merge(
102        &self,
103        from: &ImageStore<'_, f32, 4>,
104        into: &mut ImageStoreMut<'_, u8, 4>,
105    ) -> Result<(), PicScaleError> {
106        let mut dst_buffer = into.to_colorutils_buffer_mut();
107        xyz_with_alpha_to_rgba(
108            &from.to_colorutils_buffer(),
109            &mut dst_buffer,
110            &XYZ_TO_SRGB_D65,
111            TransferFunction::Srgb,
112        )
113        .map_err(|x| PicScaleError::Generic(x.to_string()))
114    }
115
116    fn bit_depth(&self) -> usize {
117        8
118    }
119}
120
121impl XYZScaler {
122    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) -> Self {
123        self.scaler.threading_policy = threading_policy;
124        *self
125    }
126
127    pub fn plan_rgb_resampling(
128        &self,
129        source_size: ImageSize,
130        target_size: ImageSize,
131    ) -> Result<Arc<Resampling<u8, 3>>, PicScaleError> {
132        let intercept = self
133            .scaler
134            .plan_rgb_resampling_f32(source_size, target_size)?;
135        let scratch_size = intercept.scratch_size();
136        Ok(Arc::new(SplitPlanInterceptor {
137            intercept,
138            splitter: Arc::new(XyzRgbSplitter {}),
139            inner_scratch: scratch_size,
140        }))
141    }
142
143    pub fn plan_rgba_resampling(
144        &self,
145        source_size: ImageSize,
146        target_size: ImageSize,
147        premultiply_alpha: bool,
148    ) -> Result<Arc<Resampling<u8, 4>>, PicScaleError> {
149        let intercept =
150            self.scaler
151                .plan_rgba_resampling_f32(source_size, target_size, premultiply_alpha)?;
152        let scratch_size = intercept.scratch_size();
153        Ok(Arc::new(SplitPlanInterceptor {
154            intercept,
155            splitter: Arc::new(XyzRgbaSplitter {}),
156            inner_scratch: scratch_size,
157        }))
158    }
159}
pic_scale/colors/xyz_scaler.rs

pic_scale/colors/
xyz_scaler.rs
