67 lines
2.8 KiB
Rust
67 lines
2.8 KiB
Rust
/*
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* // Copyright (c) Radzivon Bartoshyk 3/2025. All rights reserved.
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* //
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* // Redistribution and use in source and binary forms, with or without modification,
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* // are permitted provided that the following conditions are met:
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* //
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* // 1. Redistributions of source code must retain the above copyright notice, this
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* // list of conditions and the following disclaimer.
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* //
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* // 2. Redistributions in binary form must reproduce the above copyright notice,
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* // this list of conditions and the following disclaimer in the documentation
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* // and/or other materials provided with the distribution.
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* //
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* // 3. Neither the name of the copyright holder nor the names of its
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* // contributors may be used to endorse or promote products derived from
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* // this software without specific prior written permission.
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* //
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* // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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use crate::Rgb;
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#[inline]
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fn filmlike_clip_rgb_tone(r: &mut f32, g: &mut f32, b: &mut f32, l: f32) {
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let new_r = r.min(l);
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let new_b = b.min(l);
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let new_g = new_b + ((new_r - new_b) * (*g - *b) / (*r - *b));
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*r = new_r;
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*g = new_g;
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*b = new_b;
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}
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/// Soft clipping out-of-bounds values in S-curve
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///
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/// Works only on highlights, negative values are skipped
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#[inline]
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pub fn filmlike_clip(rgb: Rgb<f32>) -> Rgb<f32> {
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const L: f32 = 1.;
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let mut rgb = rgb;
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if rgb.r >= rgb.g {
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if rgb.g > rgb.b {
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filmlike_clip_rgb_tone(&mut rgb.r, &mut rgb.g, &mut rgb.b, L);
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} else if rgb.b > rgb.r {
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filmlike_clip_rgb_tone(&mut rgb.b, &mut rgb.r, &mut rgb.g, L);
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} else if rgb.b > rgb.g {
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filmlike_clip_rgb_tone(&mut rgb.r, &mut rgb.b, &mut rgb.g, L);
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} else {
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Rgb::new(rgb.r.min(L), rgb.g.min(L), rgb.g);
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}
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} else if rgb.r >= rgb.b {
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filmlike_clip_rgb_tone(&mut rgb.g, &mut rgb.r, &mut rgb.b, L);
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} else if rgb.b > rgb.g {
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filmlike_clip_rgb_tone(&mut rgb.b, &mut rgb.g, &mut rgb.r, L);
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} else {
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filmlike_clip_rgb_tone(&mut rgb.g, &mut rgb.b, &mut rgb.r, L);
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}
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rgb
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}
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