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 */
10
11 #ifndef VPX_VP9_COMMON_VP9_SCALE_H_
12 #define VPX_VP9_COMMON_VP9_SCALE_H_
13
14 #include "vp9/common/vp9_mv.h"
15 #include "vpx_dsp/vpx_convolve.h"
16
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20
21 #define REF_SCALE_SHIFT 14
22 #define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
23 #define REF_INVALID_SCALE -1
24
25 struct scale_factors {
26 int x_scale_fp; // horizontal fixed point scale factor
27 int y_scale_fp; // vertical fixed point scale factor
28 int x_step_q4;
29 int y_step_q4;
30
31 int (*scale_value_x)(int val, const struct scale_factors *sf);
32 int (*scale_value_y)(int val, const struct scale_factors *sf);
33
34 convolve_fn_t predict[2][2][2]; // horiz, vert, avg
35 #if CONFIG_VP9_HIGHBITDEPTH
36 highbd_convolve_fn_t highbd_predict[2][2][2]; // horiz, vert, avg
37 #endif
38 };
39
40 MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf);
41
42 #if CONFIG_VP9_HIGHBITDEPTH
43 void vp9_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
44 int other_h, int this_w, int this_h,
45 int use_highbd);
46 #else
47 void vp9_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
48 int other_h, int this_w, int this_h);
49 #endif
50
vp9_is_valid_scale(const struct scale_factors * sf)51 static INLINE int vp9_is_valid_scale(const struct scale_factors *sf) {
52 return sf->x_scale_fp != REF_INVALID_SCALE &&
53 sf->y_scale_fp != REF_INVALID_SCALE;
54 }
55
vp9_is_scaled(const struct scale_factors * sf)56 static INLINE int vp9_is_scaled(const struct scale_factors *sf) {
57 return vp9_is_valid_scale(sf) &&
58 (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE);
59 }
60
valid_ref_frame_size(int ref_width,int ref_height,int this_width,int this_height)61 static INLINE int valid_ref_frame_size(int ref_width, int ref_height,
62 int this_width, int this_height) {
63 return 2 * this_width >= ref_width && 2 * this_height >= ref_height &&
64 this_width <= 16 * ref_width && this_height <= 16 * ref_height;
65 }
66
67 #ifdef __cplusplus
68 } // extern "C"
69 #endif
70
71 #endif // VPX_VP9_COMMON_VP9_SCALE_H_
72