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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 VP9_COMMON_VP9_SCALE_H_
12 #define 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_high);
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  // VP9_COMMON_VP9_SCALE_H_
72