LCOV - code coverage report
Current view: directory - gfx/ycbcr - yuv_convert_mmx.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 26 0 0.0 %
Date: 2012-06-02 Functions: 1 0 0.0 %

       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 <mmintrin.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                 : // MMX version does 8 pixels at a time.
      13               0 : void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
      14                 :                     int source_width, int source_y_fraction) {
      15               0 :   __m64 zero = _mm_setzero_si64();
      16               0 :   __m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
      17               0 :   __m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
      18                 : 
      19               0 :   const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
      20               0 :   const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
      21               0 :   __m64* dest64 = reinterpret_cast<__m64*>(ybuf);
      22               0 :   __m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
      23                 : 
      24               0 :   do {
      25               0 :     __m64 y0 = *y0_ptr64++;
      26               0 :     __m64 y1 = *y1_ptr64++;
      27               0 :     __m64 y2 = _mm_unpackhi_pi8(y0, zero);
      28               0 :     __m64 y3 = _mm_unpackhi_pi8(y1, zero);
      29               0 :     y0 = _mm_unpacklo_pi8(y0, zero);
      30               0 :     y1 = _mm_unpacklo_pi8(y1, zero);
      31               0 :     y0 = _mm_mullo_pi16(y0, y0_fraction);
      32               0 :     y1 = _mm_mullo_pi16(y1, y1_fraction);
      33               0 :     y2 = _mm_mullo_pi16(y2, y0_fraction);
      34               0 :     y3 = _mm_mullo_pi16(y3, y1_fraction);
      35               0 :     y0 = _mm_add_pi16(y0, y1);
      36               0 :     y2 = _mm_add_pi16(y2, y3);
      37               0 :     y0 = _mm_srli_pi16(y0, 8);
      38               0 :     y2 = _mm_srli_pi16(y2, 8);
      39               0 :     y0 = _mm_packs_pu16(y0, y2);
      40               0 :     *dest64++ = y0;
      41                 :   } while (dest64 < end64);
      42               0 : }
      43                 : 
      44                 : }
      45                 : }

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