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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 SkPMFloat.h | |
9 | |
10 inline SkPMFloat::SkPMFloat(SkPMColor c) { | |
11 SkPMColorAssert(c); | |
12 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3 | |
13 const char _ = ~0; // Zero these bytes. | |
14 __m128i fix8 = _mm_cvtsi32_si128((int)c), | |
15 fix8_32 = _mm_shuffle_epi8(fix8, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_
,_,_, 3,_,_,_)); | |
16 #else | |
17 __m128i fix8 = _mm_cvtsi32_si128((int)c), | |
18 fix8_16 = _mm_unpacklo_epi8 (fix8, _mm_setzero_si128()), | |
19 fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128()); | |
20 #endif | |
21 fVec = _mm_mul_ps(_mm_cvtepi32_ps(fix8_32), _mm_set1_ps(1.0f / 255)); | |
22 SkASSERT(this->isValid()); | |
23 } | |
24 | |
25 inline SkPMColor SkPMFloat::round() const { | |
26 // We don't use _mm_cvtps_epi32, because we want precise control over how 0.
5 rounds (up). | |
27 __m128 scaled = _mm_mul_ps(_mm_set1_ps(255), fVec); | |
28 __m128i fix8_32 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), scaled)), | |
29 fix8_16 = _mm_packus_epi16(fix8_32, fix8_32), | |
30 fix8 = _mm_packus_epi16(fix8_16, fix8_16); | |
31 SkPMColor c = _mm_cvtsi128_si32(fix8); | |
32 SkPMColorAssert(c); | |
33 return c; | |
34 } | |
35 | |
36 inline Sk4f SkPMFloat::alphas() const { | |
37 static_assert(SK_A32_SHIFT == 24, ""); | |
38 return _mm_shuffle_ps(fVec, fVec, 0xff); // Read as 11 11 11 11, copying la
ne 3 to all lanes. | |
39 } | |
40 | |
41 inline SkPMFloat SkPMFloat::FromOpaqueColor(SkColor c) { | |
42 SkASSERT(SkColorGetA(c) == 0xFF); | |
43 __m128i fix8 = _mm_cvtsi32_si128((int)c); | |
44 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3 | |
45 const char _ = ~0; // Zero these bytes. | |
46 __m128i fix8_32 = _mm_shuffle_epi8(fix8, | |
47 #if defined(SK_PMCOLOR_IS_BGRA) | |
48 _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_) | |
49 #else | |
50 _mm_setr_epi8(2,_,_,_, 1,_,_,_, 0,_,_,_, 3,_,_,_) | |
51 #endif | |
52 ); | |
53 #else | |
54 __m128i fix8_16 = _mm_unpacklo_epi8 (fix8 , _mm_setzero_si128()), | |
55 fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128()); | |
56 #if defined(SK_PMCOLOR_IS_RGBA) | |
57 fix8_32 = _mm_shuffle_epi32(fix8_32, 0xC6); // C6 == 11 00 01 10, i.e s
wap lanes 0 and 2. | |
58 #endif | |
59 #endif | |
60 SkPMFloat pmf = Sk4f(_mm_mul_ps(_mm_cvtepi32_ps(fix8_32), _mm_set1_ps(1.0f/2
55))); | |
61 SkASSERT(pmf.isValid()); | |
62 return pmf; | |
63 } | |
64 | |
65 } // namespace | |
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