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SIMD Convert. faster implementation

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homm 2016-05-25 05:39:59 +03:00 committed by Alexander Karpinsky
parent a7de792025
commit 6e91b2b41f
1 changed files with 7 additions and 8 deletions
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15
src/libImaging/Convert.c
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@ -465,24 +465,23 @@ rgbA2rgba(UINT8* out, const UINT8* in, int xsize)
int x = 0; int x = 0;
__m128i zero = _mm_setzero_si128(); __m128i zero = _mm_setzero_si128();
__m128i half = _mm_set1_epi16(128); __m128i half = _mm_set1_epi16(128);
__m128i maxalpha = _mm_set_epi16(255, 0, 0, 0, 255, 0, 0, 0); __m128i maxalpha = _mm_set1_epi32(0xff000000);
__m128i source, pix1, pix2, factors; __m128i factormask = _mm_set_epi8(15,15,15,15, 11,11,11,11, 7,7,7,7, 3,3,3,3);
__m128i factorsource, source, pix1, pix2, factors;
for (; x < xsize - 3; x += 4) { for (; x < xsize - 3; x += 4) {
source = _mm_loadu_si128((__m128i *) &in[x * 4]); source = _mm_loadu_si128((__m128i *) &in[x * 4]);
factorsource = _mm_shuffle_epi8(source, factormask);
factorsource = _mm_or_si128(factorsource, maxalpha);
pix1 = _mm_unpacklo_epi8(source, zero); pix1 = _mm_unpacklo_epi8(source, zero);
factors = _mm_shufflelo_epi16(pix1, _MM_SHUFFLE(3, 3, 3, 3)); factors = _mm_unpacklo_epi8(factorsource, zero);
factors = _mm_shufflehi_epi16(factors, _MM_SHUFFLE(3, 3, 3, 3));
factors = _mm_or_si128(factors, maxalpha);
pix1 = _mm_add_epi16(_mm_mullo_epi16(pix1, factors), half); pix1 = _mm_add_epi16(_mm_mullo_epi16(pix1, factors), half);
pix1 = _mm_add_epi16(pix1, _mm_srli_epi16(pix1, 8)); pix1 = _mm_add_epi16(pix1, _mm_srli_epi16(pix1, 8));
pix1 = _mm_srli_epi16(pix1, 8); pix1 = _mm_srli_epi16(pix1, 8);
pix2 = _mm_unpackhi_epi8(source, zero); pix2 = _mm_unpackhi_epi8(source, zero);
factors = _mm_shufflelo_epi16(pix2, _MM_SHUFFLE(3, 3, 3, 3)); factors = _mm_unpackhi_epi8(factorsource, zero);
factors = _mm_shufflehi_epi16(factors, _MM_SHUFFLE(3, 3, 3, 3));
factors = _mm_or_si128(factors, maxalpha);
pix2 = _mm_add_epi16(_mm_mullo_epi16(pix2, factors), half); pix2 = _mm_add_epi16(_mm_mullo_epi16(pix2, factors), half);
pix2 = _mm_add_epi16(pix2, _mm_srli_epi16(pix2, 8)); pix2 = _mm_add_epi16(pix2, _mm_srli_epi16(pix2, 8));
pix2 = _mm_srli_epi16(pix2, 8); pix2 = _mm_srli_epi16(pix2, 8);