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 "vp9/common/vp9_convolve.h" 16 17#ifdef __cplusplus 18extern "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 25struct 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}; 36 37MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf); 38 39void vp9_setup_scale_factors_for_frame(struct scale_factors *sf, 40 int other_w, int other_h, 41 int this_w, int this_h); 42 43static INLINE int vp9_is_valid_scale(const struct scale_factors *sf) { 44 return sf->x_scale_fp != REF_INVALID_SCALE && 45 sf->y_scale_fp != REF_INVALID_SCALE; 46} 47 48static INLINE int vp9_is_scaled(const struct scale_factors *sf) { 49 return sf->x_scale_fp != REF_NO_SCALE || 50 sf->y_scale_fp != REF_NO_SCALE; 51} 52 53#ifdef __cplusplus 54} // extern "C" 55#endif 56 57#endif // VP9_COMMON_VP9_SCALE_H_ 58