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46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <mmintrin.h>
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#include "yuv_row.h"
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namespace mozilla {
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namespace gfx {
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// FilterRows combines two rows of the image using linear interpolation.
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// MMX version does 8 pixels at a time.
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void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
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int source_width, int source_y_fraction) {
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__m64 zero = _mm_setzero_si64();
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__m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
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__m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
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const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
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const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
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__m64* dest64 = reinterpret_cast<__m64*>(ybuf);
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__m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
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do {
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__m64 y0 = *y0_ptr64++;
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__m64 y1 = *y1_ptr64++;
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__m64 y2 = _mm_unpackhi_pi8(y0, zero);
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__m64 y3 = _mm_unpackhi_pi8(y1, zero);
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y0 = _mm_unpacklo_pi8(y0, zero);
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y1 = _mm_unpacklo_pi8(y1, zero);
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y0 = _mm_mullo_pi16(y0, y0_fraction);
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y1 = _mm_mullo_pi16(y1, y1_fraction);
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y2 = _mm_mullo_pi16(y2, y0_fraction);
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y3 = _mm_mullo_pi16(y3, y1_fraction);
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y0 = _mm_add_pi16(y0, y1);
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y2 = _mm_add_pi16(y2, y3);
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y0 = _mm_srli_pi16(y0, 8);
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y2 = _mm_srli_pi16(y2, 8);
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y0 = _mm_packs_pu16(y0, y2);
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*dest64++ = y0;
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} while (dest64 < end64);
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}
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}
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}
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