1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ycbcr/yuv_convert_mmx.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,45 @@
1.4 +// Copyright (c) 2010 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include <mmintrin.h>
1.9 +#include "yuv_row.h"
1.10 +
1.11 +namespace mozilla {
1.12 +namespace gfx {
1.13 +
1.14 +// FilterRows combines two rows of the image using linear interpolation.
1.15 +// MMX version does 8 pixels at a time.
1.16 +void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
1.17 + int source_width, int source_y_fraction) {
1.18 + __m64 zero = _mm_setzero_si64();
1.19 + __m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
1.20 + __m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
1.21 +
1.22 + const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
1.23 + const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
1.24 + __m64* dest64 = reinterpret_cast<__m64*>(ybuf);
1.25 + __m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
1.26 +
1.27 + do {
1.28 + __m64 y0 = *y0_ptr64++;
1.29 + __m64 y1 = *y1_ptr64++;
1.30 + __m64 y2 = _mm_unpackhi_pi8(y0, zero);
1.31 + __m64 y3 = _mm_unpackhi_pi8(y1, zero);
1.32 + y0 = _mm_unpacklo_pi8(y0, zero);
1.33 + y1 = _mm_unpacklo_pi8(y1, zero);
1.34 + y0 = _mm_mullo_pi16(y0, y0_fraction);
1.35 + y1 = _mm_mullo_pi16(y1, y1_fraction);
1.36 + y2 = _mm_mullo_pi16(y2, y0_fraction);
1.37 + y3 = _mm_mullo_pi16(y3, y1_fraction);
1.38 + y0 = _mm_add_pi16(y0, y1);
1.39 + y2 = _mm_add_pi16(y2, y3);
1.40 + y0 = _mm_srli_pi16(y0, 8);
1.41 + y2 = _mm_srli_pi16(y2, 8);
1.42 + y0 = _mm_packs_pu16(y0, y2);
1.43 + *dest64++ = y0;
1.44 + } while (dest64 < end64);
1.45 +}
1.46 +
1.47 +}
1.48 +}
