libobs 2.0.5

LibOBS bindings for Rust
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
170
171
172
173
174
175
176
177

/******************************************************************************
    Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

#pragma once

#include <math.h>
#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif

static inline float gs_srgb_nonlinear_to_linear(float u)
{
	return (u <= 0.04045f) ? (u / 12.92f) : powf((u + 0.055f) / 1.055f, 2.4f);
}

static inline float gs_srgb_linear_to_nonlinear(float u)
{
	return (u <= 0.0031308f) ? (12.92f * u) : ((1.055f * powf(u, 1.0f / 2.4f)) - 0.055f);
}

static inline float gs_u8_to_float(uint8_t u)
{
	return (float)u / 255.0f;
}

static inline void gs_u8x4_to_float4(float *f, const uint8_t *u)
{
	f[0] = gs_u8_to_float(u[0]);
	f[1] = gs_u8_to_float(u[1]);
	f[2] = gs_u8_to_float(u[2]);
	f[3] = gs_u8_to_float(u[3]);
}

static inline uint8_t gs_float_to_u8(float f)
{
	return (uint8_t)(f * 255.0f + 0.5f);
}

static inline void gs_premultiply_float4(float *f)
{
	f[0] *= f[3];
	f[1] *= f[3];
	f[2] *= f[3];
}

static inline void gs_float3_to_u8x3(uint8_t *u, const float *f)
{
	u[0] = gs_float_to_u8(f[0]);
	u[1] = gs_float_to_u8(f[1]);
	u[2] = gs_float_to_u8(f[2]);
}

static inline void gs_float4_to_u8x4(uint8_t *u, const float *f)
{
	u[0] = gs_float_to_u8(f[0]);
	u[1] = gs_float_to_u8(f[1]);
	u[2] = gs_float_to_u8(f[2]);
	u[3] = gs_float_to_u8(f[3]);
}

static inline void gs_float3_srgb_nonlinear_to_linear(float *f)
{
	f[0] = gs_srgb_nonlinear_to_linear(f[0]);
	f[1] = gs_srgb_nonlinear_to_linear(f[1]);
	f[2] = gs_srgb_nonlinear_to_linear(f[2]);
}

static inline void gs_float3_srgb_linear_to_nonlinear(float *f)
{
	f[0] = gs_srgb_linear_to_nonlinear(f[0]);
	f[1] = gs_srgb_linear_to_nonlinear(f[1]);
	f[2] = gs_srgb_linear_to_nonlinear(f[2]);
}

static inline void gs_premultiply_xyza(uint8_t *data)
{
	uint8_t u[4];
	float f[4];
	memcpy(&u, data, sizeof(u));
	gs_u8x4_to_float4(f, u);
	gs_premultiply_float4(f);
	gs_float3_to_u8x3(u, f);
	memcpy(data, &u, sizeof(u));
}

static inline void gs_premultiply_xyza_srgb(uint8_t *data)
{
	uint8_t u[4];
	float f[4];
	memcpy(&u, data, sizeof(u));
	gs_u8x4_to_float4(f, u);
	gs_float3_srgb_nonlinear_to_linear(f);
	gs_premultiply_float4(f);
	gs_float3_srgb_linear_to_nonlinear(f);
	gs_float3_to_u8x3(u, f);
	memcpy(data, &u, sizeof(u));
}

static inline void gs_premultiply_xyza_restrict(uint8_t *__restrict dst, const uint8_t *__restrict src)
{
	uint8_t u[4];
	float f[4];
	memcpy(&u, src, sizeof(u));
	gs_u8x4_to_float4(f, u);
	gs_premultiply_float4(f);
	gs_float3_to_u8x3(u, f);
	memcpy(dst, &u, sizeof(u));
}

static inline void gs_premultiply_xyza_srgb_restrict(uint8_t *__restrict dst, const uint8_t *__restrict src)
{
	uint8_t u[4];
	float f[4];
	memcpy(&u, src, sizeof(u));
	gs_u8x4_to_float4(f, u);
	gs_float3_srgb_nonlinear_to_linear(f);
	gs_premultiply_float4(f);
	gs_float3_srgb_linear_to_nonlinear(f);
	gs_float3_to_u8x3(u, f);
	memcpy(dst, &u, sizeof(u));
}

static inline void gs_premultiply_xyza_loop(uint8_t *data, size_t texel_count)
{
	for (size_t i = 0; i < texel_count; ++i) {
		gs_premultiply_xyza(data);
		data += 4;
	}
}

static inline void gs_premultiply_xyza_srgb_loop(uint8_t *data, size_t texel_count)
{
	for (size_t i = 0; i < texel_count; ++i) {
		gs_premultiply_xyza_srgb(data);
		data += 4;
	}
}

static inline void gs_premultiply_xyza_loop_restrict(uint8_t *__restrict dst, const uint8_t *__restrict src,
						     size_t texel_count)
{
	for (size_t i = 0; i < texel_count; ++i) {
		gs_premultiply_xyza_restrict(dst, src);
		dst += 4;
		src += 4;
	}
}

static inline void gs_premultiply_xyza_srgb_loop_restrict(uint8_t *__restrict dst, const uint8_t *__restrict src,
							  size_t texel_count)
{
	for (size_t i = 0; i < texel_count; ++i) {
		gs_premultiply_xyza_srgb_restrict(dst, src);
		dst += 4;
		src += 4;
	}
}

#ifdef __cplusplus
}
#endif