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
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
namespace { // See Sk4px.h
inline Sk4px Sk4px::DupPMColor(SkPMColor px) { return Sk16b(_mm_set1_epi32(px)); }
inline Sk4px Sk4px::Load4(const SkPMColor px[4]) {
return Sk16b(_mm_loadu_si128((const __m128i*)px));
}
inline Sk4px Sk4px::Load2(const SkPMColor px[2]) {
return Sk16b(_mm_loadl_epi64((const __m128i*)px));
}
inline Sk4px Sk4px::Load1(const SkPMColor px[1]) { return Sk16b(_mm_cvtsi32_si128(*px)); }
inline void Sk4px::store4(SkPMColor px[4]) const { _mm_storeu_si128((__m128i*)px, this->fVec); }
inline void Sk4px::store2(SkPMColor px[2]) const { _mm_storel_epi64((__m128i*)px, this->fVec); }
inline void Sk4px::store1(SkPMColor px[1]) const { *px = _mm_cvtsi128_si32(this->fVec); }
inline Sk4px::Wide Sk4px::widenLo() const {
return Sk16h(_mm_unpacklo_epi8(this->fVec, _mm_setzero_si128()),
_mm_unpackhi_epi8(this->fVec, _mm_setzero_si128()));
}
inline Sk4px::Wide Sk4px::widenHi() const {
return Sk16h(_mm_unpacklo_epi8(_mm_setzero_si128(), this->fVec),
_mm_unpackhi_epi8(_mm_setzero_si128(), this->fVec));
}
inline Sk4px::Wide Sk4px::widenLoHi() const {
return Sk16h(_mm_unpacklo_epi8(this->fVec, this->fVec),
_mm_unpackhi_epi8(this->fVec, this->fVec));
}
inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const {
return this->widenLo() * Sk4px(other).widenLo();
}
inline Sk4px Sk4px::Wide::addNarrowHi(const Sk16h& other) const {
Sk4px::Wide r = (*this + other) >> 8;
return Sk4px(_mm_packus_epi16(r.fLo.fVec, r.fHi.fVec));
}
inline Sk4px Sk4px::Wide::div255() const {
// (x + 127) / 255 == ((x+128) * 257)>>16,
// and _mm_mulhi_epu16 makes the (_ * 257)>>16 part very convenient.
const __m128i _128 = _mm_set1_epi16(128),
_257 = _mm_set1_epi16(257);
return Sk4px(_mm_packus_epi16(_mm_mulhi_epu16(_mm_add_epi16(fLo.fVec, _128), _257),
_mm_mulhi_epu16(_mm_add_epi16(fHi.fVec, _128), _257)));
}
// Load4Alphas and Load2Alphas use possibly-unaligned loads (SkAlpha[] -> uint16_t or uint32_t).
// These are safe on x86, often with no speed penalty.
#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
inline Sk4px Sk4px::alphas() const {
static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian.");
__m128i splat = _mm_set_epi8(15,15,15,15, 11,11,11,11, 7,7,7,7, 3,3,3,3);
return Sk16b(_mm_shuffle_epi8(this->fVec, splat));
}
inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) {
uint32_t as = *(const uint32_t*)a;
__m128i splat = _mm_set_epi8(3,3,3,3, 2,2,2,2, 1,1,1,1, 0,0,0,0);
return Sk16b(_mm_shuffle_epi8(_mm_cvtsi32_si128(as), splat));
}
#else
inline Sk4px Sk4px::alphas() const {
static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian.");
// We exploit that A >= rgb for any premul pixel.
__m128i as = fVec; // 3xxx 2xxx 1xxx 0xxx
as = _mm_max_epu8(as, _mm_srli_epi32(as, 8)); // 33xx 22xx 11xx 00xx
as = _mm_max_epu8(as, _mm_srli_epi32(as, 16)); // 3333 2222 1111 0000
return Sk16b(as);
}
inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) {
__m128i as = _mm_cvtsi32_si128(*(const uint32_t*)a); // ____ ____ ____ 3210
as = _mm_unpacklo_epi8 (as, as); // ____ ____ 3322 1100
as = _mm_unpacklo_epi16(as, as); // 3333 2222 1111 0000
return Sk16b(as);
}
#endif
inline Sk4px Sk4px::Load2Alphas(const SkAlpha a[2]) {
uint32_t as = *(const uint16_t*)a; // Aa -> Aa00
return Load4Alphas((const SkAlpha*)&as);
}
inline Sk4px Sk4px::zeroColors() const {
return Sk16b(_mm_and_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
}
inline Sk4px Sk4px::zeroAlphas() const {
// andnot(a,b) == ~a & b
return Sk16b(_mm_andnot_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
}
} // namespace
|
