pic_scale/colors/
lab_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::{Scaling, ScalingF32};
32use crate::support::check_image_size_overflow;
33use crate::{ImageStore, ImageStoreMut, ResamplingFunction, Scaler, ThreadingPolicy};
34use colorutils_rs::{
35    lab_to_srgb, lab_with_alpha_to_rgba, rgb_to_lab, rgba_to_lab_with_alpha, TransferFunction,
36    SRGB_TO_XYZ_D65, XYZ_TO_SRGB_D65,
37};
38
39#[derive(Debug, Copy, Clone)]
40/// Converts image to *CIE LAB* components scales it and convert back
41pub struct LabScaler {
42    pub(crate) scaler: Scaler,
43}
44
45impl LabScaler {
46    pub fn new(filter: ResamplingFunction) -> Self {
47        LabScaler {
48            scaler: Scaler::new(filter),
49        }
50    }
51
52    fn rgba_to_laba<'a>(store: &ImageStore<'a, u8, 4>) -> ImageStore<'a, f32, 4> {
53        let mut source_slice = vec![f32::default(); 4 * store.width * store.height];
54        let lab_stride = store.width as u32 * 4u32 * std::mem::size_of::<f32>() as u32;
55        rgba_to_lab_with_alpha(
56            store.buffer.as_ref(),
57            store.width as u32 * 4u32,
58            &mut source_slice,
59            lab_stride,
60            store.width as u32,
61            store.height as u32,
62            &SRGB_TO_XYZ_D65,
63            TransferFunction::Srgb,
64        );
65        let new_store = ImageStore::<f32, 4> {
66            buffer: std::borrow::Cow::Owned(source_slice),
67            channels: 4,
68            width: store.width,
69            height: store.height,
70            stride: store.width * 4,
71            bit_depth: store.bit_depth,
72        };
73        new_store
74    }
75
76    fn laba_to_srgba<'a>(store: &ImageStoreMut<'a, f32, 4>, into: &mut ImageStoreMut<'a, u8, 4>) {
77        lab_with_alpha_to_rgba(
78            store.buffer.borrow(),
79            store.width as u32 * 4u32 * std::mem::size_of::<f32>() as u32,
80            into.buffer.borrow_mut(),
81            store.width as u32 * 4u32,
82            store.width as u32,
83            store.height as u32,
84            &XYZ_TO_SRGB_D65,
85            TransferFunction::Srgb,
86        );
87    }
88}
89
90impl Scaling for LabScaler {
91    fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) {
92        self.scaler.threading_policy = threading_policy;
93    }
94
95    fn resize_cbcr8<'a>(
96        &'a self,
97        _: &ImageStore<'a, u8, 2>,
98        _: &mut ImageStoreMut<'a, u8, 2>,
99    ) -> Result<(), PicScaleError> {
100        unimplemented!()
101    }
102
103    fn resize_rgb<'a>(
104        &self,
105        store: &ImageStore<'a, u8, 3>,
106        into: &mut ImageStoreMut<'a, u8, 3>,
107    ) -> Result<(), PicScaleError> {
108        let new_size = into.get_size();
109        into.validate()?;
110        store.validate()?;
111        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
112            return Err(PicScaleError::ZeroImageDimensions);
113        }
114
115        if check_image_size_overflow(store.width, store.height, store.channels) {
116            return Err(PicScaleError::SourceImageIsTooLarge);
117        }
118
119        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
120            return Err(PicScaleError::DestinationImageIsTooLarge);
121        }
122
123        if store.width == new_size.width && store.height == new_size.height {
124            store.copied_to_mut(into);
125            return Ok(());
126        }
127
128        const COMPONENTS: usize = 3;
129
130        let mut target = vec![f32::default(); store.width * store.height * COMPONENTS];
131
132        let mut lab_store =
133            ImageStoreMut::<f32, COMPONENTS>::from_slice(&mut target, store.width, store.height)?;
134        lab_store.bit_depth = into.bit_depth;
135
136        let lab_stride =
137            lab_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
138
139        rgb_to_lab(
140            store.buffer.as_ref(),
141            store.width as u32 * COMPONENTS as u32,
142            lab_store.buffer.borrow_mut(),
143            lab_stride,
144            lab_store.width as u32,
145            lab_store.height as u32,
146            &SRGB_TO_XYZ_D65,
147            TransferFunction::Srgb,
148        );
149
150        let new_immutable_store = ImageStore::<f32, COMPONENTS> {
151            buffer: std::borrow::Cow::Owned(target),
152            channels: COMPONENTS,
153            width: store.width,
154            height: store.height,
155            stride: store.width * COMPONENTS,
156            bit_depth: into.bit_depth,
157        };
158
159        let mut new_store = ImageStoreMut::<f32, COMPONENTS>::alloc(into.width, into.height);
160        self.scaler
161            .resize_rgb_f32(&new_immutable_store, &mut new_store)?;
162
163        let new_lab_stride =
164            new_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
165        lab_to_srgb(
166            new_store.buffer.borrow(),
167            new_lab_stride,
168            into.buffer.borrow_mut(),
169            into.width as u32 * COMPONENTS as u32,
170            new_store.width as u32,
171            new_store.height as u32,
172        );
173        Ok(())
174    }
175
176    fn resize_rgba<'a>(
177        &'a self,
178        store: &ImageStore<'a, u8, 4>,
179        into: &mut ImageStoreMut<'a, u8, 4>,
180        premultiply_alpha: bool,
181    ) -> Result<(), PicScaleError> {
182        let new_size = into.get_size();
183        into.validate()?;
184        store.validate()?;
185        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
186            return Err(PicScaleError::ZeroImageDimensions);
187        }
188
189        if check_image_size_overflow(store.width, store.height, store.channels) {
190            return Err(PicScaleError::SourceImageIsTooLarge);
191        }
192
193        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
194            return Err(PicScaleError::DestinationImageIsTooLarge);
195        }
196
197        if store.width == new_size.width && store.height == new_size.height {
198            store.copied_to_mut(into);
199            return Ok(());
200        }
201
202        let lab_store = Self::rgba_to_laba(store);
203        let mut new_target_store = ImageStoreMut::alloc(new_size.width, new_size.height);
204
205        self.scaler
206            .resize_rgba_f32(&lab_store, &mut new_target_store, premultiply_alpha)?;
207        Self::laba_to_srgba(&new_target_store, into);
208        Ok(())
209    }
210}
pic_scale/colors/lab_scaler.rs

pic_scale/colors/
lab_scaler.rs
