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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 { // 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
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