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 struct scale_factors_common { 23 int x_scale_fp; // horizontal fixed point scale factor 24 int y_scale_fp; // vertical fixed point scale factor 25 int x_step_q4; 26 int y_step_q4; 27 28 int (*scale_value_x)(int val, const struct scale_factors_common *sfc); 29 int (*scale_value_y)(int val, const struct scale_factors_common *sfc); 30 void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col); 31 MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale); 32 33 convolve_fn_t predict[2][2][2]; // horiz, vert, avg 34 }; 35 36 struct scale_factors { 37 int x_offset_q4; 38 int y_offset_q4; 39 const struct scale_factors_common *sfc; 40 }; 41 42 void vp9_setup_scale_factors_for_frame(struct scale_factors *scale, 43 struct scale_factors_common *scale_comm, 44 int other_w, int other_h, 45 int this_w, int this_h); 46 47 static int vp9_is_valid_scale(const struct scale_factors_common *sfc) { 48 return sfc->x_scale_fp != REF_INVALID_SCALE && 49 sfc->y_scale_fp != REF_INVALID_SCALE; 50 } 51 52 static int vp9_is_scaled(const struct scale_factors_common *sfc) { 53 return sfc->x_scale_fp != REF_NO_SCALE || 54 sfc->y_scale_fp != REF_NO_SCALE; 55 } 56 57 #endif // VP9_COMMON_VP9_SCALE_H_ 58
