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 */
29
30use crate::pic_scale_error::PicScaleError;
31use crate::scaler::ScalingF32;
32use crate::support::check_image_size_overflow;
33use crate::{ImageStore, ImageStoreMut, ResamplingFunction, Scaler, Scaling, ThreadingPolicy};
34use colorutils_rs::{rgb_to_sigmoidal, rgba_to_sigmoidal, sigmoidal_to_rgb, sigmoidal_to_rgba};
35
36#[derive(Debug, Copy, Clone)]
37/// Converts image to *sigmoidized* components scales it and convert back
38pub struct SigmoidalScaler {
39    pub(crate) scaler: Scaler,
40}
41
42impl SigmoidalScaler {
43    pub fn new(filter: ResamplingFunction) -> Self {
44        SigmoidalScaler {
45            scaler: Scaler::new(filter),
46        }
47    }
48}
49
50impl Scaling for SigmoidalScaler {
51    fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) {
52        self.scaler.set_threading_policy(threading_policy)
53    }
54
55    fn resize_cbcr8<'a>(
56        &'a self,
57        _: &ImageStore<'a, u8, 2>,
58        _: &mut ImageStoreMut<'a, u8, 2>,
59    ) -> Result<(), PicScaleError> {
60        unimplemented!()
61    }
62
63    fn resize_rgb<'a>(
64        &self,
65        store: &ImageStore<'a, u8, 3>,
66        into: &mut ImageStoreMut<'a, u8, 3>,
67    ) -> Result<(), PicScaleError> {
68        let new_size = into.get_size();
69        into.validate()?;
70        store.validate()?;
71        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
72            return Err(PicScaleError::ZeroImageDimensions);
73        }
74
75        if check_image_size_overflow(store.width, store.height, store.channels) {
76            return Err(PicScaleError::SourceImageIsTooLarge);
77        }
78
79        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
80            return Err(PicScaleError::DestinationImageIsTooLarge);
81        }
82
83        if store.width == new_size.width && store.height == new_size.height {
84            store.copied_to_mut(into);
85            return Ok(());
86        }
87
88        const COMPONENTS: usize = 3;
89
90        let mut target_vertical = vec![f32::default(); store.width * store.height * COMPONENTS];
91
92        let mut lab_store = ImageStoreMut::<f32, COMPONENTS>::from_slice(
93            &mut target_vertical,
94            store.width,
95            store.height,
96        )?;
97        lab_store.bit_depth = into.bit_depth;
98
99        let lab_stride =
100            lab_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
101        rgb_to_sigmoidal(
102            store.buffer.as_ref(),
103            store.width as u32 * COMPONENTS as u32,
104            lab_store.buffer.borrow_mut(),
105            lab_stride,
106            lab_store.width as u32,
107            lab_store.height as u32,
108        );
109
110        let new_immutable_store = ImageStore::<f32, COMPONENTS> {
111            buffer: std::borrow::Cow::Owned(target_vertical),
112            channels: COMPONENTS,
113            width: store.width,
114            height: store.height,
115            stride: store.width * COMPONENTS,
116            bit_depth: into.bit_depth,
117        };
118
119        let mut new_store = ImageStoreMut::<f32, COMPONENTS>::alloc(into.width, into.height);
120        self.scaler
121            .resize_rgb_f32(&new_immutable_store, &mut new_store)?;
122
123        let new_lab_stride =
124            new_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
125
126        sigmoidal_to_rgb(
127            new_store.buffer.borrow(),
128            new_lab_stride,
129            into.buffer.borrow_mut(),
130            into.width as u32 * COMPONENTS as u32,
131            new_store.width as u32,
132            new_store.height as u32,
133        );
134        Ok(())
135    }
136
137    fn resize_rgba<'a>(
138        &'a self,
139        store: &ImageStore<'a, u8, 4>,
140        into: &mut ImageStoreMut<'a, u8, 4>,
141        premultiply_alpha: bool,
142    ) -> Result<(), PicScaleError> {
143        let new_size = into.get_size();
144        into.validate()?;
145        store.validate()?;
146        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
147            return Err(PicScaleError::ZeroImageDimensions);
148        }
149
150        if check_image_size_overflow(store.width, store.height, store.channels) {
151            return Err(PicScaleError::SourceImageIsTooLarge);
152        }
153
154        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
155            return Err(PicScaleError::DestinationImageIsTooLarge);
156        }
157
158        if store.width == new_size.width && store.height == new_size.height {
159            store.copied_to_mut(into);
160            return Ok(());
161        }
162
163        const COMPONENTS: usize = 4;
164
165        let mut target_vertical = vec![f32::default(); store.width * store.height * COMPONENTS];
166
167        let mut lab_store = ImageStoreMut::<f32, COMPONENTS>::from_slice(
168            &mut target_vertical,
169            store.width,
170            store.height,
171        )?;
172        lab_store.bit_depth = into.bit_depth;
173
174        let lab_stride =
175            lab_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
176        rgba_to_sigmoidal(
177            store.buffer.as_ref(),
178            store.width as u32 * COMPONENTS as u32,
179            lab_store.buffer.borrow_mut(),
180            lab_stride,
181            lab_store.width as u32,
182            lab_store.height as u32,
183        );
184
185        let new_immutable_store = ImageStore::<f32, COMPONENTS> {
186            buffer: std::borrow::Cow::Owned(target_vertical),
187            channels: COMPONENTS,
188            width: store.width,
189            height: store.height,
190            stride: store.width * COMPONENTS,
191            bit_depth: into.bit_depth,
192        };
193
194        let mut new_store = ImageStoreMut::<f32, COMPONENTS>::alloc(into.width, into.height);
195        self.scaler
196            .resize_rgba_f32(&new_immutable_store, &mut new_store, premultiply_alpha)?;
197
198        let new_lab_stride =
199            new_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
200
201        sigmoidal_to_rgba(
202            new_store.buffer.borrow(),
203            new_lab_stride,
204            into.buffer.borrow_mut(),
205            into.width as u32 * COMPONENTS as u32,
206            new_store.width as u32,
207            new_store.height as u32,
208        );
209        Ok(())
210    }
211}
pic_scale/colors/sigmoidal_scaler.rs

pic_scale/colors/
sigmoidal_scaler.rs
