pic_scale/colors/
jzazbz_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 colorutils_rs::{
30    jzazbz_to_rgb, jzazbz_to_rgba, rgb_to_jzazbz, rgba_to_jzazbz, TransferFunction,
31};
32
33use crate::pic_scale_error::PicScaleError;
34use crate::scaler::ScalingF32;
35use crate::support::check_image_size_overflow;
36use crate::{ImageStore, ImageStoreMut, ResamplingFunction, Scaler, Scaling, ThreadingPolicy};
37
38#[derive(Debug, Copy, Clone)]
39/// Converts image to *Jzazbz* components scales it and convert back
40pub struct JzazbzScaler {
41    pub(crate) scaler: Scaler,
42    pub(crate) transfer_function: TransferFunction,
43    pub(crate) display_luminance: f32,
44}
45
46impl JzazbzScaler {
47    /// # Arguments
48    /// - `transfer_function` - Transfer function to move into linear colorspace and back
49    /// - `display_luminance` - Display luminance for *Jzazbz*
50    pub fn new(
51        filter: ResamplingFunction,
52        display_luminance: f32,
53        transfer_function: TransferFunction,
54    ) -> Self {
55        JzazbzScaler {
56            scaler: Scaler::new(filter),
57            transfer_function,
58            display_luminance,
59        }
60    }
61
62    fn rgba_to_laba<'a>(&self, store: &ImageStore<'a, u8, 4>) -> ImageStore<'a, f32, 4> {
63        let mut source_slice = vec![f32::default(); 4 * store.width * store.height];
64        let lab_stride = store.width as u32 * 4u32 * std::mem::size_of::<f32>() as u32;
65        rgba_to_jzazbz(
66            store.buffer.as_ref(),
67            store.width as u32 * 4u32,
68            &mut source_slice,
69            lab_stride,
70            store.width as u32,
71            store.height as u32,
72            self.display_luminance,
73            self.transfer_function,
74        );
75        let new_store = ImageStore::<f32, 4> {
76            buffer: std::borrow::Cow::Owned(source_slice),
77            channels: 4,
78            width: store.width,
79            height: store.height,
80            stride: store.width * 4,
81            bit_depth: store.bit_depth,
82        };
83        new_store
84    }
85
86    fn laba_to_srgba<'a>(
87        &self,
88        store: &ImageStoreMut<'a, f32, 4>,
89        into: &mut ImageStoreMut<'a, u8, 4>,
90    ) {
91        jzazbz_to_rgba(
92            store.buffer.borrow(),
93            store.width as u32 * 4u32 * std::mem::size_of::<f32>() as u32,
94            into.buffer.borrow_mut(),
95            store.width as u32 * 4u32,
96            store.width as u32,
97            store.height as u32,
98            self.display_luminance,
99            self.transfer_function,
100        );
101    }
102}
103
104impl Scaling for JzazbzScaler {
105    fn set_threading_policy(&mut self, threading_policy: ThreadingPolicy) {
106        self.scaler.threading_policy = threading_policy;
107    }
108
109    fn resize_cbcr8<'a>(
110        &'a self,
111        _: &ImageStore<'a, u8, 2>,
112        _: &mut ImageStoreMut<'a, u8, 2>,
113    ) -> Result<(), PicScaleError> {
114        unimplemented!()
115    }
116
117    fn resize_rgb<'a>(
118        &'a self,
119        store: &ImageStore<'a, u8, 3>,
120        into: &mut ImageStoreMut<'a, u8, 3>,
121    ) -> Result<(), PicScaleError> {
122        let new_size = into.get_size();
123        into.validate()?;
124        store.validate()?;
125        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
126            return Err(PicScaleError::ZeroImageDimensions);
127        }
128
129        if check_image_size_overflow(store.width, store.height, store.channels) {
130            return Err(PicScaleError::SourceImageIsTooLarge);
131        }
132
133        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
134            return Err(PicScaleError::DestinationImageIsTooLarge);
135        }
136
137        if store.width == new_size.width && store.height == new_size.height {
138            store.copied_to_mut(into);
139            return Ok(());
140        }
141
142        const COMPONENTS: usize = 3;
143
144        let mut target = vec![f32::default(); store.width * store.height * COMPONENTS];
145
146        let mut lab_store =
147            ImageStoreMut::<f32, COMPONENTS>::from_slice(&mut target, store.width, store.height)?;
148        lab_store.bit_depth = into.bit_depth;
149
150        let lab_stride =
151            lab_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
152        rgb_to_jzazbz(
153            store.buffer.as_ref(),
154            store.width as u32 * COMPONENTS as u32,
155            lab_store.buffer.borrow_mut(),
156            lab_stride,
157            lab_store.width as u32,
158            lab_store.height as u32,
159            self.display_luminance,
160            self.transfer_function,
161        );
162
163        let new_immutable_store = ImageStore::<f32, COMPONENTS> {
164            buffer: std::borrow::Cow::Owned(target),
165            channels: COMPONENTS,
166            width: store.width,
167            height: store.height,
168            stride: store.width * COMPONENTS,
169            bit_depth: into.bit_depth,
170        };
171
172        let mut new_store = ImageStoreMut::<f32, COMPONENTS>::alloc(into.width, into.height);
173        self.scaler
174            .resize_rgb_f32(&new_immutable_store, &mut new_store)?;
175
176        let new_lab_stride =
177            new_store.width as u32 * COMPONENTS as u32 * std::mem::size_of::<f32>() as u32;
178
179        jzazbz_to_rgb(
180            new_store.buffer.borrow(),
181            new_lab_stride,
182            into.buffer.borrow_mut(),
183            into.width as u32 * COMPONENTS as u32,
184            new_store.width as u32,
185            new_store.height as u32,
186            self.display_luminance,
187            self.transfer_function,
188        );
189        Ok(())
190    }
191
192    fn resize_rgba<'a>(
193        &'a self,
194        store: &ImageStore<'a, u8, 4>,
195        into: &mut ImageStoreMut<'a, u8, 4>,
196        premultiply_alpha: bool,
197    ) -> Result<(), PicScaleError> {
198        let new_size = into.get_size();
199        into.validate()?;
200        store.validate()?;
201        if store.width == 0 || store.height == 0 || new_size.width == 0 || new_size.height == 0 {
202            return Err(PicScaleError::ZeroImageDimensions);
203        }
204
205        if check_image_size_overflow(store.width, store.height, store.channels) {
206            return Err(PicScaleError::SourceImageIsTooLarge);
207        }
208
209        if check_image_size_overflow(new_size.width, new_size.height, store.channels) {
210            return Err(PicScaleError::DestinationImageIsTooLarge);
211        }
212
213        if store.width == new_size.width && store.height == new_size.height {
214            store.copied_to_mut(into);
215            return Ok(());
216        }
217
218        let lab_store = self.rgba_to_laba(store);
219        let mut new_target_store = ImageStoreMut::alloc(new_size.width, new_size.height);
220
221        self.scaler
222            .resize_rgba_f32(&lab_store, &mut new_target_store, premultiply_alpha)?;
223        self.laba_to_srgba(&new_target_store, into);
224        Ok(())
225    }
226}
pic_scale/colors/jzazbz_scaler.rs

pic_scale/colors/
jzazbz_scaler.rs
