pic_scale/colors/
sigmoidal_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 crate::colors::common_splitter::{SplitPlanInterceptor, Splitter};
30use crate::plan::Resampling;
31use crate::validation::PicScaleError;
32use crate::{ImageSize, ImageStore, ImageStoreMut, ResamplingFunction, Scaler, ThreadingPolicy};
33use colorutils_rs::{
34    SRGB_TO_XYZ_D65, TransferFunction, XYZ_TO_SRGB_D65, rgb_to_sigmoidal, rgba_to_xyz_with_alpha,
35    sigmoidal_to_rgb, xyz_with_alpha_to_rgba,
36};
37use std::sync::Arc;
38
39#[derive(Debug, Copy, Clone)]
40/// Converts image to *sigmoidized* components scales it and convert back
41pub struct SigmoidalScaler {
42    pub(crate) scaler: Scaler,
43}
44
45impl SigmoidalScaler {
46    pub fn new(filter: ResamplingFunction) -> Self {
47        SigmoidalScaler {
48            scaler: Scaler::new(filter),
49        }
50    }
51}
52
53struct SigmoidalRgbSplitter {}
54
55impl Splitter<u8, f32, 3> for SigmoidalRgbSplitter {
56    fn split(
57        &self,
58        from: &ImageStore<'_, u8, 3>,
59        into: &mut ImageStoreMut<'_, f32, 3>,
60    ) -> Result<(), PicScaleError> {
61        let mut dst_buffer = into.to_colorutils_buffer_mut();
62
63        rgb_to_sigmoidal(&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        sigmoidal_to_rgb(&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 SigmoidalRgbaSplitter {}
83
84impl Splitter<u8, f32, 4> for SigmoidalRgbaSplitter {
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        rgba_to_xyz_with_alpha(
92            &from.to_colorutils_buffer(),
93            &mut dst_buffer,
94            &SRGB_TO_XYZ_D65,
95            TransferFunction::Srgb,
96        )
97        .map_err(|x| PicScaleError::Generic(x.to_string()))
98    }
99
100    fn merge(
101        &self,
102        from: &ImageStore<'_, f32, 4>,
103        into: &mut ImageStoreMut<'_, u8, 4>,
104    ) -> Result<(), PicScaleError> {
105        let mut dst_buffer = into.to_colorutils_buffer_mut();
106        xyz_with_alpha_to_rgba(
107            &from.to_colorutils_buffer(),
108            &mut dst_buffer,
109            &XYZ_TO_SRGB_D65,
110            TransferFunction::Srgb,
111        )
112        .map_err(|x| PicScaleError::Generic(x.to_string()))
113    }
114
115    fn bit_depth(&self) -> usize {
116        8
117    }
118}
119
120impl SigmoidalScaler {
121    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) -> Self {
122        self.scaler.set_threading_policy(threading_policy);
123        *self
124    }
125
126    pub fn plan_rgb_resampling(
127        &self,
128        source_size: ImageSize,
129        target_size: ImageSize,
130    ) -> Result<Arc<Resampling<u8, 3>>, PicScaleError> {
131        let intercept = self
132            .scaler
133            .plan_rgb_resampling_f32(source_size, target_size)?;
134        let scratch_size = intercept.scratch_size();
135        Ok(Arc::new(SplitPlanInterceptor {
136            intercept,
137            splitter: Arc::new(SigmoidalRgbSplitter {}),
138            inner_scratch: scratch_size,
139        }))
140    }
141
142    pub fn plan_rgba_resampling(
143        &self,
144        source_size: ImageSize,
145        target_size: ImageSize,
146        premultiply_alpha: bool,
147    ) -> Result<Arc<Resampling<u8, 4>>, PicScaleError> {
148        let intercept =
149            self.scaler
150                .plan_rgba_resampling_f32(source_size, target_size, premultiply_alpha)?;
151        let scratch_size = intercept.scratch_size();
152        Ok(Arc::new(SplitPlanInterceptor {
153            intercept,
154            splitter: Arc::new(SigmoidalRgbaSplitter {}),
155            inner_scratch: scratch_size,
156        }))
157    }
158}
pic_scale/colors/sigmoidal_scaler.rs

pic_scale/colors/
sigmoidal_scaler.rs
