yuv 0.8.12

High performance utilities for YUV format handling and conversion.
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

/*
 * Copyright (c) Radzivon Bartoshyk, 10/2024. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1.  Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2.  Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3.  Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
use crate::wasm32::transpose::{wasm_store_interleave_u8x3, wasm_store_interleave_u8x4};
use crate::yuv_support::YuvSourceChannels;
use std::arch::wasm32::*;

#[inline]
pub(crate) unsafe fn v128_load_half(ptr: *const u8) -> v128 {
    u64x2_replace_lane::<0>(i64x2_splat(0), (ptr as *const u64).read_unaligned())
}

/// Packs two i16x8 into one u8x16 using unsigned saturation
#[inline]
pub(crate) unsafe fn i16x8_pack_sat_u8x16(a: v128, b: v128) -> v128 {
    let maxval = u16x8_splat(255);
    let minval = u16x8_splat(0);
    let mut a1 = v128_bitselect(maxval, a, i16x8_gt(a, maxval));
    a1 = v128_bitselect(minval, a1, i16x8_lt(a, minval));
    let mut b1 = v128_bitselect(maxval, b, i16x8_gt(b, maxval));
    b1 = v128_bitselect(minval, b1, i16x8_lt(b, minval));
    u8x16_shuffle::<0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30>(a1, b1)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_zip_lo_i8x16(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpacklo_i8x16(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpacklo_i16x8(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<0, 1, 16, 17, 2, 3, 18, 19, 4, 5, 20, 21, 6, 7, 22, 23>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpacklo_i32x4(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<0, 1, 2, 3, 16, 17, 18, 19, 4, 5, 6, 7, 20, 21, 22, 23>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpacklo_i64x2(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpackhi_i8x16(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpackhi_i16x8(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<8, 9, 24, 25, 10, 11, 26, 27, 12, 13, 28, 29, 14, 15, 30, 31>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpackhi_i32x4(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<8, 9, 10, 11, 24, 25, 26, 27, 12, 13, 14, 15, 28, 29, 30, 31>(a, b)
}

#[inline]
#[allow(dead_code)]
pub(crate) unsafe fn wasm_unpackhi_i64x2(a: v128, b: v128) -> v128 {
    u8x16_shuffle::<8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31>(a, b)
}

#[inline(always)]
pub(crate) unsafe fn wasm_store_rgb<const CN: u8>(
    ptr: *mut u8,
    r: v128,
    g: v128,
    b: v128,
    a: v128,
) {
    let destination_channels: YuvSourceChannels = CN.into();
    match destination_channels {
        YuvSourceChannels::Rgb => {
            let dst_pack = (r, g, b);
            wasm_store_interleave_u8x3(ptr, dst_pack);
        }
        YuvSourceChannels::Bgr => {
            let dst_pack = (b, g, r);
            wasm_store_interleave_u8x3(ptr, dst_pack);
        }
        YuvSourceChannels::Rgba => {
            let dst_pack = (r, g, b, a);
            wasm_store_interleave_u8x4(ptr, dst_pack);
        }
        YuvSourceChannels::Bgra => {
            let dst_pack = (b, g, r, a);
            wasm_store_interleave_u8x4(ptr, dst_pack);
        }
    }
}