60 lines
1.3 KiB
Rust
60 lines
1.3 KiB
Rust
use crate::utils::ordered_float::F32;
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#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
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pub enum Eotf {
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Linear,
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St2084Pq,
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Bt1886(F32),
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Gamma22,
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Gamma24,
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Gamma28,
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St240,
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Log100,
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Log316,
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St428,
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Pow(EotfPow),
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CompoundPower24,
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}
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const MUL: u32 = 10_000;
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const MUL_F32: f32 = MUL as f32;
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#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Ord, PartialOrd)]
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pub struct EotfPow(pub u32);
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impl EotfPow {
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pub const MIN: Self = Self(10_000);
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pub const LINEAR: Self = Self(10_000);
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pub const GAMMA22: Self = Self(22_000);
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pub const GAMMA24: Self = Self(24_000);
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pub const GAMMA28: Self = Self(28_000);
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pub const MAX: Self = Self(100_000);
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pub fn eotf_f32(self) -> f32 {
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self.0 as f32 / MUL_F32
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}
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pub fn inv_eotf_f32(self) -> f32 {
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MUL_F32 / self.0 as f32
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}
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}
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pub fn bt1886_eotf_args(c: F32) -> [f32; 4] {
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let c = c.0;
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let gamma = 1.0 / 2.4;
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let a1 = 1.0 / (1.0 - c);
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let a2 = 1.0 - c.powf(gamma);
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let a3 = c.powf(gamma);
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let a4 = c;
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[a1, a2, a3, a4]
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}
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pub fn bt1886_inv_eotf_args(c: F32) -> [f32; 4] {
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let c = c.0;
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let gamma = 1.0 / 2.4;
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let a1 = 1.0 / (1.0 - c.powf(gamma));
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let a2 = 1.0 - c;
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let a3 = c;
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let a4 = c.powf(gamma);
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[a1, a2, a3, a4]
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}
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