54 lines
1.8 KiB
Rust
54 lines
1.8 KiB
Rust
//! Gamma correction tools
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//!
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//! Gamma correction adjusts the color ramp to look *perceptually* linear
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//! (LEDs with pulse-width modulation are pretty good at giving physically linear results already)
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use crate::{Lights, HardwareRgb};
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use crate::rgb::Rgb;
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static GAMMA_LOOKUP: &[u8] = &[
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
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2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
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5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
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10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
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17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
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25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
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37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
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51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
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69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
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90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
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115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
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144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
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177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
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215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255
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];
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#[inline]
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pub fn correct(rgb: &Rgb) -> HardwareRgb {
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HardwareRgb(
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GAMMA_LOOKUP[rgb.0 as usize],
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GAMMA_LOOKUP[rgb.1 as usize],
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GAMMA_LOOKUP[rgb.2 as usize]
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)
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}
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pub struct GammaCorrector<T>(pub T);
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impl<T> Lights for GammaCorrector<T>
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where T: Lights<Pixel = HardwareRgb>
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{
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type Pixel = Rgb;
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#[inline]
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fn render(&mut self, pixel: &Rgb) {
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self.0.render(&correct(pixel))
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}
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#[inline]
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fn latch(&mut self) {
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self.0.latch();
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}
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}
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