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(&self, from: &ImageStore<'_, u8, 3>, into: &mut ImageStoreMut<'_, f32, 3>) {
57        let lab_stride = into.width as u32 * 3u32 * size_of::<f32>() as u32;
58
59        rgb_to_sigmoidal(
60            from.buffer.as_ref(),
61            from.width as u32 * 3u32,
62            into.buffer.borrow_mut(),
63            lab_stride,
64            into.width as u32,
65            into.height as u32,
66        );
67    }
68
69    fn merge(&self, from: &ImageStore<'_, f32, 3>, into: &mut ImageStoreMut<'_, u8, 3>) {
70        let new_lab_stride = into.width as u32 * 3 * size_of::<f32>() as u32;
71        sigmoidal_to_rgb(
72            from.buffer.as_ref(),
73            new_lab_stride,
74            into.buffer.borrow_mut(),
75            into.width as u32 * 3,
76            into.width as u32,
77            into.height as u32,
78        );
79    }
80
81    fn bit_depth(&self) -> usize {
82        8
83    }
84}
85
86struct SigmoidalRgbaSplitter {}
87
88impl Splitter<u8, f32, 4> for SigmoidalRgbaSplitter {
89    fn split(&self, from: &ImageStore<'_, u8, 4>, into: &mut ImageStoreMut<'_, f32, 4>) {
90        let lab_stride = into.width as u32 * 4u32 * size_of::<f32>() as u32;
91
92        rgba_to_xyz_with_alpha(
93            from.buffer.as_ref(),
94            from.width as u32 * 4u32,
95            into.buffer.borrow_mut(),
96            lab_stride,
97            into.width as u32,
98            into.height as u32,
99            &SRGB_TO_XYZ_D65,
100            TransferFunction::Srgb,
101        );
102    }
103
104    fn merge(&self, from: &ImageStore<'_, f32, 4>, into: &mut ImageStoreMut<'_, u8, 4>) {
105        let new_lab_stride = into.width as u32 * 4 * size_of::<f32>() as u32;
106        xyz_with_alpha_to_rgba(
107            from.buffer.as_ref(),
108            new_lab_stride,
109            into.buffer.borrow_mut(),
110            into.width as u32 * 4,
111            into.width as u32,
112            into.height as u32,
113            &XYZ_TO_SRGB_D65,
114            TransferFunction::Srgb,
115        );
116    }
117
118    fn bit_depth(&self) -> usize {
119        8
120    }
121}
122
123impl SigmoidalScaler {
124    pub fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) -> Self {
125        self.scaler.set_threading_policy(threading_policy);
126        *self
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(SigmoidalRgbSplitter {}),
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(SigmoidalRgbaSplitter {}),
158            inner_scratch: scratch_size,
159        }))
160    }
161}
pic_scale/colors/sigmoidal_scaler.rs

pic_scale/colors/
sigmoidal_scaler.rs
