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1 #include "SkColorPriv.h" | |
2 #include "SkPMFloat.h" | |
3 #include <emmintrin.h> | |
4 | |
5 // For set(), we widen our 8 bit components (fix8) to 8-bit components in 16 bit
s (fix8_16), | |
6 // then widen those to 8-bit-in-32-bits (fix8_32), convert those to floats (scal
ed), | |
7 // then finally scale those down from [0.0f, 255.0f] to [0.0f, 1.0f] into fColor
. | |
8 | |
9 // get() and clamped() do the opposite, working from [0.0f, 1.0f] floats to [0.0
f, 255.0f], | |
10 // to 8-bit-in-32-bit, to 8-bit-in-16-bit, back down to 8-bit components. | |
11 // _mm_packus_epi16() gives us clamping for free while narrowing. | |
12 | |
13 inline void SkPMFloat::set(SkPMColor c) { | |
14 SkPMColorAssert(c); | |
15 __m128i fix8 = _mm_set_epi32(0,0,0,c), | |
16 fix8_16 = _mm_unpacklo_epi8 (fix8, _mm_setzero_si128()), | |
17 fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128()); | |
18 __m128 scaled = _mm_cvtepi32_ps(fix8_32); | |
19 _mm_store_ps(fColor, _mm_mul_ps(scaled, _mm_set1_ps(1.0f/255.0f))); | |
20 SkASSERT(this->isValid()); | |
21 } | |
22 | |
23 inline SkPMColor SkPMFloat::get() const { | |
24 SkASSERT(this->isValid()); | |
25 return this->clamped(); // At the moment, we don't know anything faster. | |
26 } | |
27 | |
28 inline SkPMColor SkPMFloat::clamped() const { | |
29 __m128 scaled = _mm_mul_ps(_mm_load_ps(fColor), _mm_set1_ps(255.0f)); | |
30 __m128i fix8_32 = _mm_cvtps_epi32(scaled), | |
31 fix8_16 = _mm_packus_epi16(fix8_32, fix8_32), | |
32 fix8 = _mm_packus_epi16(fix8_16, fix8_16); | |
33 SkPMColor c = _mm_cvtsi128_si32(fix8); | |
34 SkPMColorAssert(c); | |
35 return c; | |
36 } | |
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