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// 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 <mmintrin.h>
#include "yuv_row.h"
namespace mozilla {
namespace gfx {
// FilterRows combines two rows of the image using linear interpolation.
// MMX version does 8 pixels at a time.
void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
int source_width, int source_y_fraction) {
__m64 zero = _mm_setzero_si64();
__m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
__m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
__m64* dest64 = reinterpret_cast<__m64*>(ybuf);
__m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
do {
__m64 y0 = *y0_ptr64++;
__m64 y1 = *y1_ptr64++;
__m64 y2 = _mm_unpackhi_pi8(y0, zero);
__m64 y3 = _mm_unpackhi_pi8(y1, zero);
y0 = _mm_unpacklo_pi8(y0, zero);
y1 = _mm_unpacklo_pi8(y1, zero);
y0 = _mm_mullo_pi16(y0, y0_fraction);
y1 = _mm_mullo_pi16(y1, y1_fraction);
y2 = _mm_mullo_pi16(y2, y0_fraction);
y3 = _mm_mullo_pi16(y3, y1_fraction);
y0 = _mm_add_pi16(y0, y1);
y2 = _mm_add_pi16(y2, y3);
y0 = _mm_srli_pi16(y0, 8);
y2 = _mm_srli_pi16(y2, 8);
y0 = _mm_packs_pu16(y0, y2);
*dest64++ = y0;
} while (dest64 < end64);
}
} // namespace gfx
} // namespace mozilla
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