michael@0: /*
michael@0:  *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: #ifndef VP9_COMMON_VP9_SCALE_H_
michael@0: #define VP9_COMMON_VP9_SCALE_H_
michael@0: 
michael@0: #include "vp9/common/vp9_mv.h"
michael@0: #include "vp9/common/vp9_convolve.h"
michael@0: 
michael@0: #define REF_SCALE_SHIFT 14
michael@0: #define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
michael@0: #define REF_INVALID_SCALE -1
michael@0: 
michael@0: struct scale_factors;
michael@0: struct scale_factors_common {
michael@0:   int x_scale_fp;   // horizontal fixed point scale factor
michael@0:   int y_scale_fp;   // vertical fixed point scale factor
michael@0:   int x_step_q4;
michael@0:   int y_step_q4;
michael@0: 
michael@0:   int (*scale_value_x)(int val, const struct scale_factors_common *sfc);
michael@0:   int (*scale_value_y)(int val, const struct scale_factors_common *sfc);
michael@0:   void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
michael@0:   MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
michael@0: 
michael@0:   convolve_fn_t predict[2][2][2];  // horiz, vert, avg
michael@0: };
michael@0: 
michael@0: struct scale_factors {
michael@0:   int x_offset_q4;
michael@0:   int y_offset_q4;
michael@0:   const struct scale_factors_common *sfc;
michael@0: };
michael@0: 
michael@0: void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
michael@0:                                        struct scale_factors_common *scale_comm,
michael@0:                                        int other_w, int other_h,
michael@0:                                        int this_w, int this_h);
michael@0: 
michael@0: static int vp9_is_valid_scale(const struct scale_factors_common *sfc) {
michael@0:   return sfc->x_scale_fp != REF_INVALID_SCALE &&
michael@0:          sfc->y_scale_fp != REF_INVALID_SCALE;
michael@0: }
michael@0: 
michael@0: static int vp9_is_scaled(const struct scale_factors_common *sfc) {
michael@0:   return sfc->x_scale_fp != REF_NO_SCALE ||
michael@0:          sfc->y_scale_fp != REF_NO_SCALE;
michael@0: }
michael@0: 
michael@0: #endif  // VP9_COMMON_VP9_SCALE_H_