зеркало из https://github.com/mozilla/pjs.git
48 строки
1.6 KiB
C++
48 строки
1.6 KiB
C++
// 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 <emmintrin.h>
|
|
#include "yuv_row.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
// FilterRows combines two rows of the image using linear interpolation.
|
|
// SSE2 version does 16 pixels at a time.
|
|
void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
|
|
int source_width, int source_y_fraction) {
|
|
__m128i zero = _mm_setzero_si128();
|
|
__m128i y1_fraction = _mm_set1_epi16(source_y_fraction);
|
|
__m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction);
|
|
|
|
const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr);
|
|
const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr);
|
|
__m128i* dest128 = reinterpret_cast<__m128i*>(ybuf);
|
|
__m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width);
|
|
|
|
do {
|
|
__m128i y0 = _mm_loadu_si128(y0_ptr128);
|
|
__m128i y1 = _mm_loadu_si128(y1_ptr128);
|
|
__m128i y2 = _mm_unpackhi_epi8(y0, zero);
|
|
__m128i y3 = _mm_unpackhi_epi8(y1, zero);
|
|
y0 = _mm_unpacklo_epi8(y0, zero);
|
|
y1 = _mm_unpacklo_epi8(y1, zero);
|
|
y0 = _mm_mullo_epi16(y0, y0_fraction);
|
|
y1 = _mm_mullo_epi16(y1, y1_fraction);
|
|
y2 = _mm_mullo_epi16(y2, y0_fraction);
|
|
y3 = _mm_mullo_epi16(y3, y1_fraction);
|
|
y0 = _mm_add_epi16(y0, y1);
|
|
y2 = _mm_add_epi16(y2, y3);
|
|
y0 = _mm_srli_epi16(y0, 8);
|
|
y2 = _mm_srli_epi16(y2, 8);
|
|
y0 = _mm_packus_epi16(y0, y2);
|
|
*dest128++ = y0;
|
|
++y0_ptr128;
|
|
++y1_ptr128;
|
|
} while (dest128 < end128);
|
|
}
|
|
|
|
}
|
|
}
|