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comparison: gfx/ycbcr/yuv_convert_sse2.cpp
gfx/ycbcr/yuv_convert_sse2.cpp
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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include <emmintrin.h> | |
| 6 #include "yuv_row.h" | |
| 7 | |
| 8 namespace mozilla { | |
| 9 namespace gfx { | |
| 10 | |
| 11 // FilterRows combines two rows of the image using linear interpolation. | |
| 12 // SSE2 version does 16 pixels at a time. | |
| 13 void FilterRows_SSE2(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr, | |
| 14 int source_width, int source_y_fraction) { | |
| 15 __m128i zero = _mm_setzero_si128(); | |
| 16 __m128i y1_fraction = _mm_set1_epi16(source_y_fraction); | |
| 17 __m128i y0_fraction = _mm_set1_epi16(256 - source_y_fraction); | |
| 18 | |
| 19 const __m128i* y0_ptr128 = reinterpret_cast<const __m128i*>(y0_ptr); | |
| 20 const __m128i* y1_ptr128 = reinterpret_cast<const __m128i*>(y1_ptr); | |
| 21 __m128i* dest128 = reinterpret_cast<__m128i*>(ybuf); | |
| 22 __m128i* end128 = reinterpret_cast<__m128i*>(ybuf + source_width); | |
| 23 | |
| 24 do { | |
| 25 __m128i y0 = _mm_loadu_si128(y0_ptr128); | |
| 26 __m128i y1 = _mm_loadu_si128(y1_ptr128); | |
| 27 __m128i y2 = _mm_unpackhi_epi8(y0, zero); | |
| 28 __m128i y3 = _mm_unpackhi_epi8(y1, zero); | |
| 29 y0 = _mm_unpacklo_epi8(y0, zero); | |
| 30 y1 = _mm_unpacklo_epi8(y1, zero); | |
| 31 y0 = _mm_mullo_epi16(y0, y0_fraction); | |
| 32 y1 = _mm_mullo_epi16(y1, y1_fraction); | |
| 33 y2 = _mm_mullo_epi16(y2, y0_fraction); | |
| 34 y3 = _mm_mullo_epi16(y3, y1_fraction); | |
| 35 y0 = _mm_add_epi16(y0, y1); | |
| 36 y2 = _mm_add_epi16(y2, y3); | |
| 37 y0 = _mm_srli_epi16(y0, 8); | |
| 38 y2 = _mm_srli_epi16(y2, 8); | |
| 39 y0 = _mm_packus_epi16(y0, y2); | |
| 40 *dest128++ = y0; | |
| 41 ++y0_ptr128; | |
| 42 ++y1_ptr128; | |
| 43 } while (dest128 < end128); | |
| 44 } | |
| 45 | |
| 46 } | |
| 47 } |
