1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 namespace { // See Sk4px.h
9
DupPMColor(SkPMColor px)10 inline Sk4px Sk4px::DupPMColor(SkPMColor px) { return Sk16b(_mm_set1_epi32(px)); }
11
Load4(const SkPMColor px[4])12 inline Sk4px Sk4px::Load4(const SkPMColor px[4]) {
13 return Sk16b(_mm_loadu_si128((const __m128i*)px));
14 }
Load2(const SkPMColor px[2])15 inline Sk4px Sk4px::Load2(const SkPMColor px[2]) {
16 return Sk16b(_mm_loadl_epi64((const __m128i*)px));
17 }
Load1(const SkPMColor px[1])18 inline Sk4px Sk4px::Load1(const SkPMColor px[1]) { return Sk16b(_mm_cvtsi32_si128(*px)); }
19
store4(SkPMColor px[4])20 inline void Sk4px::store4(SkPMColor px[4]) const { _mm_storeu_si128((__m128i*)px, this->fVec); }
store2(SkPMColor px[2])21 inline void Sk4px::store2(SkPMColor px[2]) const { _mm_storel_epi64((__m128i*)px, this->fVec); }
store1(SkPMColor px[1])22 inline void Sk4px::store1(SkPMColor px[1]) const { *px = _mm_cvtsi128_si32(this->fVec); }
23
widenLo()24 inline Sk4px::Wide Sk4px::widenLo() const {
25 return Sk16h(_mm_unpacklo_epi8(this->fVec, _mm_setzero_si128()),
26 _mm_unpackhi_epi8(this->fVec, _mm_setzero_si128()));
27 }
28
widenHi()29 inline Sk4px::Wide Sk4px::widenHi() const {
30 return Sk16h(_mm_unpacklo_epi8(_mm_setzero_si128(), this->fVec),
31 _mm_unpackhi_epi8(_mm_setzero_si128(), this->fVec));
32 }
33
widenLoHi()34 inline Sk4px::Wide Sk4px::widenLoHi() const {
35 return Sk16h(_mm_unpacklo_epi8(this->fVec, this->fVec),
36 _mm_unpackhi_epi8(this->fVec, this->fVec));
37 }
38
mulWiden(const Sk16b & other)39 inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const {
40 return this->widenLo() * Sk4px(other).widenLo();
41 }
42
addNarrowHi(const Sk16h & other)43 inline Sk4px Sk4px::Wide::addNarrowHi(const Sk16h& other) const {
44 Sk4px::Wide r = (*this + other) >> 8;
45 return Sk4px(_mm_packus_epi16(r.fLo.fVec, r.fHi.fVec));
46 }
47
div255()48 inline Sk4px Sk4px::Wide::div255() const {
49 // (x + 127) / 255 == ((x+128) * 257)>>16,
50 // and _mm_mulhi_epu16 makes the (_ * 257)>>16 part very convenient.
51 const __m128i _128 = _mm_set1_epi16(128),
52 _257 = _mm_set1_epi16(257);
53 return Sk4px(_mm_packus_epi16(_mm_mulhi_epu16(_mm_add_epi16(fLo.fVec, _128), _257),
54 _mm_mulhi_epu16(_mm_add_epi16(fHi.fVec, _128), _257)));
55 }
56
57 // Load4Alphas and Load2Alphas use possibly-unaligned loads (SkAlpha[] -> uint16_t or uint32_t).
58 // These are safe on x86, often with no speed penalty.
59
60 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
alphas()61 inline Sk4px Sk4px::alphas() const {
62 static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian.");
63 __m128i splat = _mm_set_epi8(15,15,15,15, 11,11,11,11, 7,7,7,7, 3,3,3,3);
64 return Sk16b(_mm_shuffle_epi8(this->fVec, splat));
65 }
66
Load4Alphas(const SkAlpha a[4])67 inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) {
68 uint32_t as = *(const uint32_t*)a;
69 __m128i splat = _mm_set_epi8(3,3,3,3, 2,2,2,2, 1,1,1,1, 0,0,0,0);
70 return Sk16b(_mm_shuffle_epi8(_mm_cvtsi32_si128(as), splat));
71 }
72 #else
alphas()73 inline Sk4px Sk4px::alphas() const {
74 static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian.");
75 // We exploit that A >= rgb for any premul pixel.
76 __m128i as = fVec; // 3xxx 2xxx 1xxx 0xxx
77 as = _mm_max_epu8(as, _mm_srli_epi32(as, 8)); // 33xx 22xx 11xx 00xx
78 as = _mm_max_epu8(as, _mm_srli_epi32(as, 16)); // 3333 2222 1111 0000
79 return Sk16b(as);
80 }
81
Load4Alphas(const SkAlpha a[4])82 inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) {
83 __m128i as = _mm_cvtsi32_si128(*(const uint32_t*)a); // ____ ____ ____ 3210
84 as = _mm_unpacklo_epi8 (as, as); // ____ ____ 3322 1100
85 as = _mm_unpacklo_epi16(as, as); // 3333 2222 1111 0000
86 return Sk16b(as);
87 }
88 #endif
89
Load2Alphas(const SkAlpha a[2])90 inline Sk4px Sk4px::Load2Alphas(const SkAlpha a[2]) {
91 uint32_t as = *(const uint16_t*)a; // Aa -> Aa00
92 return Load4Alphas((const SkAlpha*)&as);
93 }
94
zeroColors()95 inline Sk4px Sk4px::zeroColors() const {
96 return Sk16b(_mm_and_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
97 }
98
zeroAlphas()99 inline Sk4px Sk4px::zeroAlphas() const {
100 // andnot(a,b) == ~a & b
101 return Sk16b(_mm_andnot_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
102 }
103
104 } // namespace
105