media/libvpx/vp9/common/vp9_scale.h@ac0c01689b40
media/libvpx/vp9/common/vp9_scale.h
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 #ifndef VP9_COMMON_VP9_SCALE_H_
12 #define VP9_COMMON_VP9_SCALE_H_
14 #include "vp9/common/vp9_mv.h"
15 #include "vp9/common/vp9_convolve.h"
17 #define REF_SCALE_SHIFT 14
18 #define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
19 #define REF_INVALID_SCALE -1
21 struct scale_factors;
22 struct scale_factors_common {
23 int x_scale_fp; // horizontal fixed point scale factor
24 int y_scale_fp; // vertical fixed point scale factor
25 int x_step_q4;
26 int y_step_q4;
28 int (*scale_value_x)(int val, const struct scale_factors_common *sfc);
29 int (*scale_value_y)(int val, const struct scale_factors_common *sfc);
30 void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
31 MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
33 convolve_fn_t predict[2][2][2]; // horiz, vert, avg
34 };
36 struct scale_factors {
37 int x_offset_q4;
38 int y_offset_q4;
39 const struct scale_factors_common *sfc;
40 };
42 void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
43 struct scale_factors_common *scale_comm,
44 int other_w, int other_h,
45 int this_w, int this_h);
47 static int vp9_is_valid_scale(const struct scale_factors_common *sfc) {
48 return sfc->x_scale_fp != REF_INVALID_SCALE &&
49 sfc->y_scale_fp != REF_INVALID_SCALE;
50 }
52 static int vp9_is_scaled(const struct scale_factors_common *sfc) {
53 return sfc->x_scale_fp != REF_NO_SCALE ||
54 sfc->y_scale_fp != REF_NO_SCALE;
55 }
57 #endif // VP9_COMMON_VP9_SCALE_H_
