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