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48 lines
1.6 KiB
C++
48 lines
1.6 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 <emmintrin.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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// SSE2 version does 16 pixels at a time.
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void FilterRows_SSE2(uint8_t* ybuf, const uint8_t* y0_ptr, const uint8_t* y1_ptr,
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int source_width, int source_y_fraction) {
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__m128i zero = _mm_setzero_si128();
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__m128i y1_fraction = _mm_set1_epi16(source_y_fraction);
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__m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction);
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const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr);
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const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr);
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__m128i* dest128 = reinterpret_cast<__m128i*>(ybuf);
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__m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width);
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do {
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__m128i y0 = _mm_loadu_si128(y0_ptr128);
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__m128i y1 = _mm_loadu_si128(y1_ptr128);
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__m128i y2 = _mm_unpackhi_epi8(y0, zero);
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__m128i y3 = _mm_unpackhi_epi8(y1, zero);
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y0 = _mm_unpacklo_epi8(y0, zero);
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y1 = _mm_unpacklo_epi8(y1, zero);
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y0 = _mm_mullo_epi16(y0, y0_fraction);
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y1 = _mm_mullo_epi16(y1, y1_fraction);
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y2 = _mm_mullo_epi16(y2, y0_fraction);
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y3 = _mm_mullo_epi16(y3, y1_fraction);
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y0 = _mm_add_epi16(y0, y1);
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y2 = _mm_add_epi16(y2, y3);
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y0 = _mm_srli_epi16(y0, 8);
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y2 = _mm_srli_epi16(y2, 8);
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y0 = _mm_packus_epi16(y0, y2);
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*dest128++ = y0;
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++y0_ptr128;
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++y1_ptr128;
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} while (dest128 < end128);
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}
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} // namespace gfx
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} // namespace mozilla
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