The Tor Browser / file comparison
comparison: gfx/ycbcr/yuv_convert_mmx.cpp
gfx/ycbcr/yuv_convert_mmx.cpp
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:9dbc4c010344 |
|---|---|
| 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 <mmintrin.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 // MMX version does 8 pixels at a time. | |
| 13 void FilterRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr, | |
| 14 int source_width, int source_y_fraction) { | |
| 15 __m64 zero = _mm_setzero_si64(); | |
| 16 __m64 y1_fraction = _mm_set1_pi16(source_y_fraction); | |
| 17 __m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction); | |
| 18 | |
| 19 const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr); | |
| 20 const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr); | |
| 21 __m64* dest64 = reinterpret_cast<__m64*>(ybuf); | |
| 22 __m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width); | |
| 23 | |
| 24 do { | |
| 25 __m64 y0 = *y0_ptr64++; | |
| 26 __m64 y1 = *y1_ptr64++; | |
| 27 __m64 y2 = _mm_unpackhi_pi8(y0, zero); | |
| 28 __m64 y3 = _mm_unpackhi_pi8(y1, zero); | |
| 29 y0 = _mm_unpacklo_pi8(y0, zero); | |
| 30 y1 = _mm_unpacklo_pi8(y1, zero); | |
| 31 y0 = _mm_mullo_pi16(y0, y0_fraction); | |
| 32 y1 = _mm_mullo_pi16(y1, y1_fraction); | |
| 33 y2 = _mm_mullo_pi16(y2, y0_fraction); | |
| 34 y3 = _mm_mullo_pi16(y3, y1_fraction); | |
| 35 y0 = _mm_add_pi16(y0, y1); | |
| 36 y2 = _mm_add_pi16(y2, y3); | |
| 37 y0 = _mm_srli_pi16(y0, 8); | |
| 38 y2 = _mm_srli_pi16(y2, 8); | |
| 39 y0 = _mm_packs_pu16(y0, y2); | |
| 40 *dest64++ = y0; | |
| 41 } while (dest64 < end64); | |
| 42 } | |
| 43 | |
| 44 } | |
| 45 } |
