michael@0: // Copyright (c) 2010 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include <emmintrin.h>
michael@0: #include "yuv_row.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: // FilterRows combines two rows of the image using linear interpolation.
michael@0: // SSE2 version does 16 pixels at a time.
michael@0: void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
michael@0:                      int source_width, int source_y_fraction) {
michael@0:   __m128i zero = _mm_setzero_si128();
michael@0:   __m128i y1_fraction = _mm_set1_epi16(source_y_fraction);
michael@0:   __m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction);
michael@0: 
michael@0:   const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr);
michael@0:   const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr);
michael@0:   __m128i* dest128 = reinterpret_cast<__m128i*>(ybuf);
michael@0:   __m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width);
michael@0: 
michael@0:   do {
michael@0:     __m128i y0 = _mm_loadu_si128(y0_ptr128);
michael@0:     __m128i y1 = _mm_loadu_si128(y1_ptr128);
michael@0:     __m128i y2 = _mm_unpackhi_epi8(y0, zero);
michael@0:     __m128i y3 = _mm_unpackhi_epi8(y1, zero);
michael@0:     y0 = _mm_unpacklo_epi8(y0, zero);
michael@0:     y1 = _mm_unpacklo_epi8(y1, zero);
michael@0:     y0 = _mm_mullo_epi16(y0, y0_fraction);
michael@0:     y1 = _mm_mullo_epi16(y1, y1_fraction);
michael@0:     y2 = _mm_mullo_epi16(y2, y0_fraction);
michael@0:     y3 = _mm_mullo_epi16(y3, y1_fraction);
michael@0:     y0 = _mm_add_epi16(y0, y1);
michael@0:     y2 = _mm_add_epi16(y2, y3);
michael@0:     y0 = _mm_srli_epi16(y0, 8);
michael@0:     y2 = _mm_srli_epi16(y2, 8);
michael@0:     y0 = _mm_packus_epi16(y0, y2);
michael@0:     *dest128++ = y0;
michael@0:     ++y0_ptr128;
michael@0:     ++y1_ptr128;
michael@0:   } while (dest128 < end128);
michael@0: }
michael@0: 
michael@0: }
michael@0: }