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    SRGB_TO_XYZ_D65, TransferFunction, XYZ_TO_SRGB_D65, lab_to_srgb, lab_with_alpha_to_rgba,
36    rgb_to_lab, rgba_to_lab_with_alpha,
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 * 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        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    }
74
75    fn laba_to_srgba<'a>(store: &ImageStoreMut<'a, f32, 4>, into: &mut ImageStoreMut<'a, u8, 4>) {
76        lab_with_alpha_to_rgba(
77            store.buffer.borrow(),
78            store.width as u32 * 4u32 * size_of::<f32>() as u32,
79            into.buffer.borrow_mut(),
80            store.width as u32 * 4u32,
81            store.width as u32,
82            store.height as u32,
83            &XYZ_TO_SRGB_D65,
84            TransferFunction::Srgb,
85        );
86    }
87}
88
89impl Scaling for LabScaler {
90    fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) {
91        self.scaler.threading_policy = threading_policy;
92    }
93
94    fn resize_plane<'a>(
95        &'a self,
96        _: &ImageStore<'a, u8, 1>,
97        _: &mut ImageStoreMut<'a, u8, 1>,
98    ) -> Result<(), PicScaleError> {
99        unimplemented!()
100    }
101
102    fn resize_cbcr8<'a>(
103        &'a self,
104        _: &ImageStore<'a, u8, 2>,
105        _: &mut ImageStoreMut<'a, u8, 2>,
106    ) -> Result<(), PicScaleError> {
107        unimplemented!()
108    }
109
110    fn resize_gray_alpha<'a>(
111        &'a self,
112        _: &ImageStore<'a, u8, 2>,
113        _: &mut ImageStoreMut<'a, u8, 2>,
114        _: bool,
115    ) -> Result<(), PicScaleError> {
116        unimplemented!()
117    }
118
119    fn resize_rgb<'a>(
120        &self,
121        store: &ImageStore<'a, u8, 3>,
122        into: &mut ImageStoreMut<'a, u8, 3>,
123    ) -> Result<(), PicScaleError> {
124        let new_size = into.get_size();
125        into.validate()?;
126        store.validate()?;
127        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
128            return Err(PicScaleError::ZeroImageDimensions);
129        }
130
131        if check_image_size_overflow(store.width, store.height, store.channels) {
132            return Err(PicScaleError::SourceImageIsTooLarge);
133        }
134
135        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
136            return Err(PicScaleError::DestinationImageIsTooLarge);
137        }
138
139        if store.width == new_size.width && store.height == new_size.height {
140            store.copied_to_mut(into);
141            return Ok(());
142        }
143
144        const CN: usize = 3;
145
146        let mut target = vec![f32::default(); store.width * store.height * CN];
147
148        let mut lab_store =
149            ImageStoreMut::<f32, CN>::from_slice(&mut target, store.width, store.height)?;
150        lab_store.bit_depth = into.bit_depth;
151
152        let lab_stride = lab_store.width as u32 * CN as u32 * size_of::<f32>() as u32;
153
154        rgb_to_lab(
155            store.buffer.as_ref(),
156            store.width as u32 * CN as u32,
157            lab_store.buffer.borrow_mut(),
158            lab_stride,
159            lab_store.width as u32,
160            lab_store.height as u32,
161            &SRGB_TO_XYZ_D65,
162            TransferFunction::Srgb,
163        );
164
165        let new_immutable_store = ImageStore::<f32, CN> {
166            buffer: std::borrow::Cow::Owned(target),
167            channels: CN,
168            width: store.width,
169            height: store.height,
170            stride: store.width * CN,
171            bit_depth: into.bit_depth,
172        };
173
174        let mut new_store = ImageStoreMut::<f32, CN>::alloc(into.width, into.height);
175        self.scaler
176            .resize_rgb_f32(&new_immutable_store, &mut new_store)?;
177
178        let new_lab_stride = new_store.width as u32 * CN as u32 * size_of::<f32>() as u32;
179        lab_to_srgb(
180            new_store.buffer.borrow(),
181            new_lab_stride,
182            into.buffer.borrow_mut(),
183            into.width as u32 * CN as u32,
184            new_store.width as u32,
185            new_store.height as u32,
186        );
187        Ok(())
188    }
189
190    fn resize_rgba<'a>(
191        &'a self,
192        store: &ImageStore<'a, u8, 4>,
193        into: &mut ImageStoreMut<'a, u8, 4>,
194        premultiply_alpha: bool,
195    ) -> Result<(), PicScaleError> {
196        let new_size = into.get_size();
197        into.validate()?;
198        store.validate()?;
199        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
200            return Err(PicScaleError::ZeroImageDimensions);
201        }
202
203        if check_image_size_overflow(store.width, store.height, store.channels) {
204            return Err(PicScaleError::SourceImageIsTooLarge);
205        }
206
207        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
208            return Err(PicScaleError::DestinationImageIsTooLarge);
209        }
210
211        if store.width == new_size.width && store.height == new_size.height {
212            store.copied_to_mut(into);
213            return Ok(());
214        }
215
216        let lab_store = Self::rgba_to_laba(store);
217        let mut new_target_store = ImageStoreMut::alloc(new_size.width, new_size.height);
218
219        self.scaler
220            .resize_rgba_f32(&lab_store, &mut new_target_store, premultiply_alpha)?;
221        Self::laba_to_srgba(&new_target_store, into);
222        Ok(())
223    }
224}
pic_scale/colors/lab_scaler.rs

pic_scale/colors/
lab_scaler.rs
