From ab46181de5ddc368584f200628461dea4feda602 Mon Sep 17 00:00:00 2001 From: homm Date: Sun, 12 Jun 2016 21:05:06 +0300 Subject: [PATCH] increase precision --- src/libImaging/AlphaComposite.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/libImaging/AlphaComposite.c b/src/libImaging/AlphaComposite.c index c65405afd..7750dcb23 100644 --- a/src/libImaging/AlphaComposite.c +++ b/src/libImaging/AlphaComposite.c @@ -39,6 +39,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) int xsize = imDst->xsize; __m128i mm_max_alpha = _mm_set1_epi32(255); __m128i mm_max_alpha2 = _mm_set1_epi32(255 * 255); + __m256i mm_half = _mm_set1_epi32(128); __m128i mm_get_lo = _mm_set_epi8( -1,-1, 5,4, 5,4, 5,4, -1,-1, 1,0, 1,0, 1,0); __m128i mm_get_hi = _mm_set_epi8( @@ -46,6 +47,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) #if defined(__AVX2__) __m256i vmm_max_alpha = _mm256_set1_epi32(255); __m256i vmm_max_alpha2 = _mm256_set1_epi32(255 * 255); + __m256i vmm_half = _mm256_set1_epi32(128); __m256i vmm_get_lo = _mm256_set_epi8( -1,-1, 5,4, 5,4, 5,4, -1,-1, 1,0, 1,0, 1,0, -1,-1, 5,4, 5,4, 5,4, -1,-1, 1,0, 1,0, 1,0); @@ -112,6 +114,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) _mm256_mullo_epi16(mm_dst_lo, _mm256_shuffle_epi8(mm_coef2, vmm_get_lo))); mm_out_lo = _mm256_or_si256(mm_out_lo, _mm256_slli_epi64( _mm256_unpacklo_epi32(mm_outa, _mm256_setzero_si256()), 48)); + mm_out_lo = _mm256_add_epi32(mm_out_lo, vmm_half); mm_out_lo = MM_SHIFTDIV255_epi16(mm_out_lo); __m256i mm_out_hi = _mm256_add_epi16( @@ -119,6 +122,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) _mm256_mullo_epi16(mm_dst_hi, _mm256_shuffle_epi8(mm_coef2, vmm_get_hi))); mm_out_hi = _mm256_or_si256(mm_out_hi, _mm256_slli_epi64( _mm256_unpackhi_epi32(mm_outa, _mm256_setzero_si256()), 48)); + mm_out_hi = _mm256_add_epi32(mm_out_hi, vmm_half); mm_out_hi = MM_SHIFTDIV255_epi16(mm_out_hi); _mm256_storeu_si256((__m256i *) &out[x], @@ -159,6 +163,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) _mm_mullo_epi16(mm_dst_lo, _mm_shuffle_epi8(mm_coef2, mm_get_lo))); mm_out_lo = _mm_or_si128(mm_out_lo, _mm_slli_epi64( _mm_unpacklo_epi32(mm_outa, _mm_setzero_si128()), 48)); + mm_out_lo = _mm_add_epi32(mm_out_lo, mm_half); mm_out_lo = MM_SHIFTDIV255_epi16(mm_out_lo); __m128i mm_out_hi = _mm_add_epi16( @@ -166,6 +171,7 @@ ImagingAlphaComposite(Imaging imDst, Imaging imSrc) _mm_mullo_epi16(mm_dst_hi, _mm_shuffle_epi8(mm_coef2, mm_get_hi))); mm_out_hi = _mm_or_si128(mm_out_hi, _mm_slli_epi64( _mm_unpackhi_epi32(mm_outa, _mm_setzero_si128()), 48)); + mm_out_hi = _mm_add_epi32(mm_out_hi, mm_half); mm_out_hi = MM_SHIFTDIV255_epi16(mm_out_hi); _mm_storeu_si128((__m128i *) &out[x],