/* * 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 { // NOLINT(google-build-namespaces) inline Sk4px::Wide Sk4px::widen() const { return Sk16h(_mm_unpacklo_epi8(this->fVec, _mm_setzero_si128()), _mm_unpackhi_epi8(this->fVec, _mm_setzero_si128())); } inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const { return this->widen() * Sk4px(other).widen(); } inline Sk4px Sk4px::Wide::addNarrowHi(const Sk16h& other) const { Sk4px::Wide r = (*this + other) >> 8; return Sk4px(_mm_packus_epi16(r.fLo.fVec, r.fHi.fVec)); } inline Sk4px Sk4px::Wide::div255() const { // (x + 127) / 255 == ((x+128) * 257)>>16, // and _mm_mulhi_epu16 makes the (_ * 257)>>16 part very convenient. const __m128i _128 = _mm_set1_epi16(128), _257 = _mm_set1_epi16(257); return Sk4px(_mm_packus_epi16(_mm_mulhi_epu16(_mm_add_epi16(fLo.fVec, _128), _257), _mm_mulhi_epu16(_mm_add_epi16(fHi.fVec, _128), _257))); } // Load4Alphas and Load2Alphas use possibly-unaligned loads (SkAlpha[] -> uint16_t or uint32_t). // These are safe on x86, often with no speed penalty. #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3 inline Sk4px Sk4px::alphas() const { static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian."); __m128i splat = _mm_set_epi8(15,15,15,15, 11,11,11,11, 7,7,7,7, 3,3,3,3); return Sk16b(_mm_shuffle_epi8(this->fVec, splat)); } inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) { uint32_t as; memcpy(&as, a, 4); __m128i splat = _mm_set_epi8(3,3,3,3, 2,2,2,2, 1,1,1,1, 0,0,0,0); return Sk16b(_mm_shuffle_epi8(_mm_cvtsi32_si128(as), splat)); } #else inline Sk4px Sk4px::alphas() const { static_assert(SK_A32_SHIFT == 24, "Intel's always little-endian."); // We exploit that A >= rgb for any premul pixel. __m128i as = fVec; // 3xxx 2xxx 1xxx 0xxx as = _mm_max_epu8(as, _mm_srli_epi32(as, 8)); // 33xx 22xx 11xx 00xx as = _mm_max_epu8(as, _mm_srli_epi32(as, 16)); // 3333 2222 1111 0000 return Sk16b(as); } inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) { __m128i as; memcpy(&as, a, 4); // ____ ____ ____ 3210 as = _mm_unpacklo_epi8 (as, as); // ____ ____ 3322 1100 as = _mm_unpacklo_epi16(as, as); // 3333 2222 1111 0000 return Sk16b(as); } #endif inline Sk4px Sk4px::Load2Alphas(const SkAlpha a[2]) { uint16_t alphas; memcpy(&alphas, a, 2); uint32_t alphas_and_two_zeros = alphas; // Aa -> Aa00 return Load4Alphas((const SkAlpha*)&alphas_and_two_zeros); } } // namespace