// Copyright (c) 2010 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include <emmintrin.h> #include "yuv_row.h" namespace mozilla { namespace gfx { // FilterRows combines two rows of the image using linear interpolation. // SSE2 version does 16 pixels at a time. void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr, int source_width, int source_y_fraction) { __m128i zero = _mm_setzero_si128(); __m128i y1_fraction = _mm_set1_epi16(source_y_fraction); __m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction); const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr); const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr); __m128i* dest128 = reinterpret_cast<__m128i*>(ybuf); __m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width); do { __m128i y0 = _mm_loadu_si128(y0_ptr128); __m128i y1 = _mm_loadu_si128(y1_ptr128); __m128i y2 = _mm_unpackhi_epi8(y0, zero); __m128i y3 = _mm_unpackhi_epi8(y1, zero); y0 = _mm_unpacklo_epi8(y0, zero); y1 = _mm_unpacklo_epi8(y1, zero); y0 = _mm_mullo_epi16(y0, y0_fraction); y1 = _mm_mullo_epi16(y1, y1_fraction); y2 = _mm_mullo_epi16(y2, y0_fraction); y3 = _mm_mullo_epi16(y3, y1_fraction); y0 = _mm_add_epi16(y0, y1); y2 = _mm_add_epi16(y2, y3); y0 = _mm_srli_epi16(y0, 8); y2 = _mm_srli_epi16(y2, 8); y0 = _mm_packus_epi16(y0, y2); *dest128++ = y0; ++y0_ptr128; ++y1_ptr128; } while (dest128 < end128); } } // namespace gfx } // namespace mozilla