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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 namespace { // See SkPMFloat.h | 8 namespace { // See SkPMFloat.h |
9 | 9 |
10 inline SkPMFloat::SkPMFloat(SkPMColor c) { | 10 inline SkPMFloat::SkPMFloat(SkPMColor c) { |
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26 // We don't use _mm_cvtps_epi32, because we want precise control over how 0.
5 rounds (up). | 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); | 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)), | 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), | 29 fix8_16 = _mm_packus_epi16(fix8_32, fix8_32), |
30 fix8 = _mm_packus_epi16(fix8_16, fix8_16); | 30 fix8 = _mm_packus_epi16(fix8_16, fix8_16); |
31 SkPMColor c = _mm_cvtsi128_si32(fix8); | 31 SkPMColor c = _mm_cvtsi128_si32(fix8); |
32 SkPMColorAssert(c); | 32 SkPMColorAssert(c); |
33 return c; | 33 return c; |
34 } | 34 } |
35 | 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 |
36 } // namespace | 41 } // namespace |
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