58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VP9_COMMON_VP9_SCALE_H_
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#define VP9_COMMON_VP9_SCALE_H_
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#include "vp9/common/vp9_mv.h"
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#include "vp9/common/vp9_convolve.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define REF_SCALE_SHIFT 14
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#define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
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#define REF_INVALID_SCALE -1
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struct scale_factors {
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int x_scale_fp; // horizontal fixed point scale factor
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int y_scale_fp; // vertical fixed point scale factor
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int x_step_q4;
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int y_step_q4;
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int (*scale_value_x)(int val, const struct scale_factors *sf);
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int (*scale_value_y)(int val, const struct scale_factors *sf);
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convolve_fn_t predict[2][2][2]; // horiz, vert, avg
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};
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MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf);
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void vp9_setup_scale_factors_for_frame(struct scale_factors *sf,
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int other_w, int other_h,
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int this_w, int this_h);
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static int vp9_is_valid_scale(const struct scale_factors *sf) {
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return sf->x_scale_fp != REF_INVALID_SCALE &&
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sf->y_scale_fp != REF_INVALID_SCALE;
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}
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static int vp9_is_scaled(const struct scale_factors *sf) {
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return sf->x_scale_fp != REF_NO_SCALE ||
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sf->y_scale_fp != REF_NO_SCALE;
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP9_COMMON_VP9_SCALE_H_
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