media/libvpx/vp9/common/arm/neon/vp9_convolve_neon.c@ac0c01689b40
media/libvpx/vp9/common/arm/neon/vp9_convolve_neon.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /*
2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
11 #include "./vp9_rtcd.h"
12 #include "vp9/common/vp9_common.h"
13 #include "vpx_ports/mem.h"
15 void vp9_convolve8_neon(const uint8_t *src, ptrdiff_t src_stride,
16 uint8_t *dst, ptrdiff_t dst_stride,
17 const int16_t *filter_x, int x_step_q4,
18 const int16_t *filter_y, int y_step_q4,
19 int w, int h) {
20 /* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
21 * maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
22 */
23 DECLARE_ALIGNED_ARRAY(8, uint8_t, temp, 64 * 72);
25 // Account for the vertical phase needing 3 lines prior and 4 lines post
26 int intermediate_height = h + 7;
28 if (x_step_q4 != 16 || y_step_q4 != 16)
29 return vp9_convolve8_c(src, src_stride,
30 dst, dst_stride,
31 filter_x, x_step_q4,
32 filter_y, y_step_q4,
33 w, h);
35 /* Filter starting 3 lines back. The neon implementation will ignore the
36 * given height and filter a multiple of 4 lines. Since this goes in to
37 * the temp buffer which has lots of extra room and is subsequently discarded
38 * this is safe if somewhat less than ideal.
39 */
40 vp9_convolve8_horiz_neon(src - src_stride * 3, src_stride,
41 temp, 64,
42 filter_x, x_step_q4, filter_y, y_step_q4,
43 w, intermediate_height);
45 /* Step into the temp buffer 3 lines to get the actual frame data */
46 vp9_convolve8_vert_neon(temp + 64 * 3, 64,
47 dst, dst_stride,
48 filter_x, x_step_q4, filter_y, y_step_q4,
49 w, h);
50 }
52 void vp9_convolve8_avg_neon(const uint8_t *src, ptrdiff_t src_stride,
53 uint8_t *dst, ptrdiff_t dst_stride,
54 const int16_t *filter_x, int x_step_q4,
55 const int16_t *filter_y, int y_step_q4,
56 int w, int h) {
57 DECLARE_ALIGNED_ARRAY(8, uint8_t, temp, 64 * 72);
58 int intermediate_height = h + 7;
60 if (x_step_q4 != 16 || y_step_q4 != 16)
61 return vp9_convolve8_avg_c(src, src_stride,
62 dst, dst_stride,
63 filter_x, x_step_q4,
64 filter_y, y_step_q4,
65 w, h);
67 /* This implementation has the same issues as above. In addition, we only want
68 * to average the values after both passes.
69 */
70 vp9_convolve8_horiz_neon(src - src_stride * 3, src_stride,
71 temp, 64,
72 filter_x, x_step_q4, filter_y, y_step_q4,
73 w, intermediate_height);
74 vp9_convolve8_avg_vert_neon(temp + 64 * 3,
75 64, dst, dst_stride,
76 filter_x, x_step_q4, filter_y, y_step_q4,
77 w, h);
78 }
