1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #ifndef AOM_AV1_COMMON_SCALE_H_
13 #define AOM_AV1_COMMON_SCALE_H_
14
15 #include "av1/common/convolve.h"
16 #include "av1/common/mv.h"
17
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21
22 #define SCALE_NUMERATOR 8
23
24 #define REF_SCALE_SHIFT 14
25 #define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
26 #define REF_INVALID_SCALE -1
27
28 struct scale_factors {
29 int x_scale_fp; // horizontal fixed point scale factor
30 int y_scale_fp; // vertical fixed point scale factor
31 int x_step_q4;
32 int y_step_q4;
33
34 int (*scale_value_x)(int val, const struct scale_factors *sf);
35 int (*scale_value_y)(int val, const struct scale_factors *sf);
36
37 // convolve_fn_ptr[subpel_x != 0][subpel_y != 0][is_compound]
38 aom_convolve_fn_t convolve[2][2][2];
39 aom_highbd_convolve_fn_t highbd_convolve[2][2][2];
40 };
41
42 MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf);
43
44 void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
45 int other_h, int this_w, int this_h);
46
av1_is_valid_scale(const struct scale_factors * sf)47 static INLINE int av1_is_valid_scale(const struct scale_factors *sf) {
48 return sf->x_scale_fp != REF_INVALID_SCALE &&
49 sf->y_scale_fp != REF_INVALID_SCALE;
50 }
51
av1_is_scaled(const struct scale_factors * sf)52 static INLINE int av1_is_scaled(const struct scale_factors *sf) {
53 return av1_is_valid_scale(sf) &&
54 (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE);
55 }
56
valid_ref_frame_size(int ref_width,int ref_height,int this_width,int this_height)57 static INLINE int valid_ref_frame_size(int ref_width, int ref_height,
58 int this_width, int this_height) {
59 return 2 * this_width >= ref_width && 2 * this_height >= ref_height &&
60 this_width <= 16 * ref_width && this_height <= 16 * ref_height;
61 }
62
63 #ifdef __cplusplus
64 } // extern "C"
65 #endif
66
67 #endif // AOM_AV1_COMMON_SCALE_H_
68