oxihuman-viewer 0.2.1

wgpu/WebGPU rendering adapter for OxiHuman
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
// SPDX-License-Identifier: Apache-2.0

//! Lens distortion post-process (barrel/pincushion).

#![allow(dead_code)]

#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct LensDistortionConfig {
    pub k1: f32,
    pub k2: f32,
    pub center: [f32; 2],
    pub strength: f32,
}

#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct LensDistortionState {
    pub enabled: bool,
    pub config: LensDistortionConfig,
}

#[allow(dead_code)]
pub fn default_lens_distortion_config() -> LensDistortionConfig {
    LensDistortionConfig {
        k1: 0.0,
        k2: 0.0,
        center: [0.5, 0.5],
        strength: 0.0,
    }
}

#[allow(dead_code)]
pub fn new_lens_distortion_state() -> LensDistortionState {
    LensDistortionState {
        enabled: false,
        config: default_lens_distortion_config(),
    }
}

#[allow(dead_code)]
pub fn ld_distort_uv(state: &LensDistortionState, uv: [f32; 2]) -> [f32; 2] {
    if !state.enabled {
        return uv;
    }
    let cx = state.config.center[0];
    let cy = state.config.center[1];
    let dx = uv[0] - cx;
    let dy = uv[1] - cy;
    let r2 = dx * dx + dy * dy;
    let factor = 1.0 + state.config.k1 * r2 + state.config.k2 * r2 * r2;
    [cx + dx * factor, cy + dy * factor]
}

#[allow(dead_code)]
pub fn ld_set_strength(state: &mut LensDistortionState, strength: f32) {
    state.config.strength = strength;
    state.config.k1 = strength;
}

#[allow(dead_code)]
pub fn ld_set_enabled(state: &mut LensDistortionState, enabled: bool) {
    state.enabled = enabled;
}

#[allow(dead_code)]
pub fn ld_is_barrel(config: &LensDistortionConfig) -> bool {
    config.k1 < 0.0
}

#[allow(dead_code)]
pub fn ld_to_json(state: &LensDistortionState) -> String {
    format!(
        r#"{{"enabled":{},"k1":{:.4},"k2":{:.4},"strength":{:.4}}}"#,
        state.enabled, state.config.k1, state.config.k2, state.config.strength
    )
}

#[allow(dead_code)]
pub fn ld_reset(state: &mut LensDistortionState) {
    *state = new_lens_distortion_state();
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_default_config() {
        let cfg = default_lens_distortion_config();
        assert!((cfg.k1 - 0.0).abs() < 1e-6);
        assert!((cfg.center[0] - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_new_state_disabled() {
        let s = new_lens_distortion_state();
        assert!(!s.enabled);
    }

    #[test]
    fn test_distort_uv_disabled_passthrough() {
        let s = new_lens_distortion_state();
        let uv = [0.3, 0.7];
        let out = ld_distort_uv(&s, uv);
        assert!((out[0] - 0.3).abs() < 1e-6);
        assert!((out[1] - 0.7).abs() < 1e-6);
    }

    #[test]
    fn test_distort_uv_enabled_center_unchanged() {
        let mut s = new_lens_distortion_state();
        ld_set_enabled(&mut s, true);
        s.config.k1 = 0.5;
        // Center point should remain at center
        let uv = [0.5, 0.5];
        let out = ld_distort_uv(&s, uv);
        assert!((out[0] - 0.5).abs() < 1e-6);
        assert!((out[1] - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_set_strength() {
        let mut s = new_lens_distortion_state();
        ld_set_strength(&mut s, 0.5);
        assert!((s.config.strength - 0.5).abs() < 1e-6);
        assert!((s.config.k1 - 0.5).abs() < 1e-6);
    }

    #[test]
    fn test_set_enabled() {
        let mut s = new_lens_distortion_state();
        ld_set_enabled(&mut s, true);
        assert!(s.enabled);
    }

    #[test]
    fn test_is_barrel_negative_k1() {
        let mut cfg = default_lens_distortion_config();
        cfg.k1 = -0.5;
        assert!(ld_is_barrel(&cfg));
    }

    #[test]
    fn test_is_not_barrel_positive_k1() {
        let mut cfg = default_lens_distortion_config();
        cfg.k1 = 0.5;
        assert!(!ld_is_barrel(&cfg));
    }

    #[test]
    fn test_to_json() {
        let s = new_lens_distortion_state();
        let j = ld_to_json(&s);
        assert!(j.contains("enabled"));
        assert!(j.contains("strength"));
    }

    #[test]
    fn test_reset() {
        let mut s = new_lens_distortion_state();
        ld_set_enabled(&mut s, true);
        ld_set_strength(&mut s, 0.9);
        ld_reset(&mut s);
        assert!(!s.enabled);
        assert!((s.config.k1 - 0.0).abs() < 1e-6);
    }
}