gfx/ycbcr/yuv_convert_mmx.cpp@97036ab72558
gfx/ycbcr/yuv_convert_mmx.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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.
5 #include <mmintrin.h>
6 #include "yuv_row.h"
8 namespace mozilla {
9 namespace gfx {
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);
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);
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 }
44 }
45 }
