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 #define REF_SCALE_SHIFT 14 18 #define REF_NO_SCALE (1 << REF_SCALE_SHIFT) 19 #define REF_INVALID_SCALE -1 20 21 struct scale_factors { 22 int x_scale_fp; // horizontal fixed point scale factor 23 int y_scale_fp; // vertical fixed point scale factor 24 int x_offset_q4; 25 int x_step_q4; 26 int y_offset_q4; 27 int y_step_q4; 28 29 int (*scale_value_x)(int val, const struct scale_factors *scale); 30 int (*scale_value_y)(int val, const struct scale_factors *scale); 31 void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col); 32 MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale); 33 34 convolve_fn_t predict[2][2][2]; // horiz, vert, avg 35 }; 36 37 void vp9_setup_scale_factors_for_frame(struct scale_factors *scale, 38 int other_w, int other_h, 39 int this_w, int this_h); 40 41 static int vp9_is_valid_scale(const struct scale_factors *sf) { 42 return sf->x_scale_fp != REF_INVALID_SCALE && 43 sf->y_scale_fp != REF_INVALID_SCALE; 44 } 45 46 static int vp9_is_scaled(const struct scale_factors *sf) { 47 return sf->x_scale_fp != REF_NO_SCALE || 48 sf->y_scale_fp != REF_NO_SCALE; 49 } 50 51 #endif // VP9_COMMON_VP9_SCALE_H_ 52
