j2k_types/transform/
quantization.rs

1// SPDX-License-Identifier: MIT OR Apache-2.0
2
3//! Irreversible quantization values and per-subband job contracts.
4
5/// Subband quantization job.
6#[derive(Debug, Clone, Copy)]
7pub struct J2kQuantizeSubbandJob<'a> {
8    /// Source subband coefficients in row-major order.
9    pub coefficients: &'a [f32],
10    /// Quantization step-size exponent.
11    pub step_exponent: u16,
12    /// Quantization step-size mantissa.
13    pub step_mantissa: u16,
14    /// Nominal range bits for this subband.
15    pub range_bits: u8,
16    /// Whether to use reversible integer quantization.
17    pub reversible: bool,
18}
19
20/// Multipliers applied to irreversible 9/7 quantization step sizes by subband.
21#[derive(Debug, Clone, Copy, PartialEq)]
22pub struct IrreversibleQuantizationSubbandScales {
23    /// Multiplier for the LL subband.
24    pub low_low: f32,
25    /// Multiplier for HL subbands.
26    pub high_low: f32,
27    /// Multiplier for LH subbands.
28    pub low_high: f32,
29    /// Multiplier for HH subbands.
30    pub high_high: f32,
31}
32
33impl Default for IrreversibleQuantizationSubbandScales {
34    fn default() -> Self {
35        Self {
36            low_low: 1.0,
37            high_low: 1.0,
38            low_high: 1.0,
39            high_high: 1.0,
40        }
41    }
42}
43
44/// Public JPEG 2000 irreversible quantization step-size tuple.
45#[derive(Debug, Clone, Copy, PartialEq, Eq)]
46pub struct IrreversibleQuantizationStep {
47    /// Quantization step-size exponent.
48    pub exponent: u8,
49    /// Quantization step-size mantissa.
50    pub mantissa: u16,
51}
j2k_types/transform/quantization.rs

j2k_types/transform/
quantization.rs
