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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
namespace { // See SkPMFloat.h
inline SkPMFloat::SkPMFloat(SkPMColor c) {
SkPMColorAssert(c);
#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
const int _ = 255; // Zero these bytes.
__m128i fix8 = _mm_cvtsi32_si128((int)c),
fix8_32 = _mm_shuffle_epi8(fix8, _mm_setr_epi8(0,_,_,_, 1,_,_,_, 2,_,_,_, 3,_,_,_));
#else
__m128i fix8 = _mm_cvtsi32_si128((int)c),
fix8_16 = _mm_unpacklo_epi8 (fix8, _mm_setzero_si128()),
fix8_32 = _mm_unpacklo_epi16(fix8_16, _mm_setzero_si128());
#endif
fVec = _mm_mul_ps(_mm_cvtepi32_ps(fix8_32), _mm_set1_ps(1.0f / 255));
SkASSERT(this->isValid());
}
inline SkPMColor SkPMFloat::round() const {
// We don't use _mm_cvtps_epi32, because we want precise control over how 0.5 rounds (up).
__m128 scaled = _mm_mul_ps(_mm_set1_ps(255), fVec);
__m128i fix8_32 = _mm_cvttps_epi32(_mm_add_ps(_mm_set1_ps(0.5f), scaled)),
fix8_16 = _mm_packus_epi16(fix8_32, fix8_32),
fix8 = _mm_packus_epi16(fix8_16, fix8_16);
SkPMColor c = _mm_cvtsi128_si32(fix8);
SkPMColorAssert(c);
return c;
}
inline Sk4f SkPMFloat::alphas() const {
static_assert(SK_A32_SHIFT == 24, "");
return _mm_shuffle_ps(fVec, fVec, 0xff); // Read as 11 11 11 11, copying lane 3 to all lanes.
}
} // namespace
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