61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
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* Copyright (c) 2018, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_AOM_DSP_RECENTER_H_
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#define AOM_AOM_DSP_RECENTER_H_
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#include "config/aom_config.h"
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#include "aom/aom_integer.h"
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// Inverse recenters a non-negative literal v around a reference r
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static INLINE uint16_t inv_recenter_nonneg(uint16_t r, uint16_t v) {
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if (v > (r << 1))
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return v;
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else if ((v & 1) == 0)
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return (v >> 1) + r;
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else
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return r - ((v + 1) >> 1);
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}
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// Inverse recenters a non-negative literal v in [0, n-1] around a
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// reference r also in [0, n-1]
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static INLINE uint16_t inv_recenter_finite_nonneg(uint16_t n, uint16_t r,
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uint16_t v) {
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if ((r << 1) <= n) {
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return inv_recenter_nonneg(r, v);
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} else {
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return n - 1 - inv_recenter_nonneg(n - 1 - r, v);
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}
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}
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// Recenters a non-negative literal v around a reference r
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static INLINE uint16_t recenter_nonneg(uint16_t r, uint16_t v) {
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if (v > (r << 1))
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return v;
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else if (v >= r)
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return ((v - r) << 1);
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else
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return ((r - v) << 1) - 1;
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}
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// Recenters a non-negative literal v in [0, n-1] around a
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// reference r also in [0, n-1]
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static INLINE uint16_t recenter_finite_nonneg(uint16_t n, uint16_t r,
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uint16_t v) {
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if ((r << 1) <= n) {
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return recenter_nonneg(r, v);
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} else {
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return recenter_nonneg(n - 1 - r, n - 1 - v);
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}
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}
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#endif // AOM_AOM_DSP_RECENTER_H_
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