Line data    Source code

       1             : // Copyright (c) 2010 The Chromium Authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include <emmintrin.h>
       6             : #include "yuv_row.h"
       7             : 
       8             : namespace mozilla {
       9             : namespace gfx {
      10             : 
      11             : // FilterRows combines two rows of the image using linear interpolation.
      12             : // SSE2 version does 16 pixels at a time.
      13           0 : void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
      14             :                      int source_width, int source_y_fraction) {
      15           0 :   __m128i zero = _mm_setzero_si128();
      16           0 :   __m128i y1_fraction = _mm_set1_epi16(source_y_fraction);
      17           0 :   __m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction);
      18             : 
      19           0 :   const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr);
      20           0 :   const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr);
      21           0 :   __m128i* dest128 = reinterpret_cast<__m128i*>(ybuf);
      22           0 :   __m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width);
      23             : 
      24           0 :   do {
      25           0 :     __m128i y0 = _mm_loadu_si128(y0_ptr128);
      26           0 :     __m128i y1 = _mm_loadu_si128(y1_ptr128);
      27           0 :     __m128i y2 = _mm_unpackhi_epi8(y0, zero);
      28           0 :     __m128i y3 = _mm_unpackhi_epi8(y1, zero);
      29           0 :     y0 = _mm_unpacklo_epi8(y0, zero);
      30           0 :     y1 = _mm_unpacklo_epi8(y1, zero);
      31           0 :     y0 = _mm_mullo_epi16(y0, y0_fraction);
      32           0 :     y1 = _mm_mullo_epi16(y1, y1_fraction);
      33           0 :     y2 = _mm_mullo_epi16(y2, y0_fraction);
      34           0 :     y3 = _mm_mullo_epi16(y3, y1_fraction);
      35           0 :     y0 = _mm_add_epi16(y0, y1);
      36           0 :     y2 = _mm_add_epi16(y2, y3);
      37           0 :     y0 = _mm_srli_epi16(y0, 8);
      38           0 :     y2 = _mm_srli_epi16(y2, 8);
      39           0 :     y0 = _mm_packus_epi16(y0, y2);
      40           0 :     *dest128++ = y0;
      41           0 :     ++y0_ptr128;
      42           0 :     ++y1_ptr128;
      43           0 :   } while (dest128 < end128);
      44           0 : }
      45             : 
      46             : } // namespace gfx
      47             : } // namespace mozilla