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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 |
| 9 |
8 // For SkPMFloat(SkPMColor), we widen our 8 bit components (fix8) to 8-bit compo
nents in 16 bits | 10 // For SkPMFloat(SkPMColor), we widen our 8 bit components (fix8) to 8-bit compo
nents in 16 bits |
9 // (fix8_16), then widen those to 8-bit-in-32-bits (fix8_32), and finally conver
t those to floats. | 11 // (fix8_16), then widen those to 8-bit-in-32-bits (fix8_32), and finally conver
t those to floats. |
10 | 12 |
11 // round() and roundClamp() do the opposite, working from floats to 8-bit-in-32-
bit, | 13 // round() and roundClamp() do the opposite, working from floats to 8-bit-in-32-
bit, |
12 // to 8-bit-in-16-bit, back down to 8-bit components. | 14 // to 8-bit-in-16-bit, back down to 8-bit components. |
13 // _mm_packus_epi16() gives us clamping for free while narrowing. | 15 // _mm_packus_epi16() gives us clamping for free while narrowing. |
14 | 16 |
15 inline SkPMFloat::SkPMFloat(SkPMColor c) { | 17 inline SkPMFloat::SkPMFloat(SkPMColor c) { |
16 SkPMColorAssert(c); | 18 SkPMColorAssert(c); |
17 __m128i fix8 = _mm_set_epi32(0,0,0,c), | 19 __m128i fix8 = _mm_set_epi32(0,0,0,c), |
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71 c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), c.fVec)), | 73 c2 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), c.fVec)), |
72 c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), d.fVec)); | 74 c3 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), d.fVec)); |
73 __m128i c3210 = _mm_packus_epi16(_mm_packus_epi16(c0, c1), | 75 __m128i c3210 = _mm_packus_epi16(_mm_packus_epi16(c0, c1), |
74 _mm_packus_epi16(c2, c3)); | 76 _mm_packus_epi16(c2, c3)); |
75 _mm_storeu_si128((__m128i*)colors, c3210); | 77 _mm_storeu_si128((__m128i*)colors, c3210); |
76 SkPMColorAssert(colors[0]); | 78 SkPMColorAssert(colors[0]); |
77 SkPMColorAssert(colors[1]); | 79 SkPMColorAssert(colors[1]); |
78 SkPMColorAssert(colors[2]); | 80 SkPMColorAssert(colors[2]); |
79 SkPMColorAssert(colors[3]); | 81 SkPMColorAssert(colors[3]); |
80 } | 82 } |
| 83 |
| 84 } // namespace |
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