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/*
* Copyright (c) 2016, 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.
*/
#ifndef AOM_AOM_DSP_AOM_DSP_COMMON_H_
#define AOM_AOM_DSP_AOM_DSP_COMMON_H_
#include "config/aom_config.h"
#include "aom/aom_integer.h"
#include "aom_ports/mem.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef MAX_SB_SIZE
#define MAX_SB_SIZE 128
#endif // ndef MAX_SB_SIZE
#define AOMMIN(x, y) (((x) < (y)) ? (x) : (y))
#define AOMMAX(x, y) (((x) > (y)) ? (x) : (y))
#define IMPLIES(a, b) (!(a) || (b)) // Logical 'a implies b' (or 'a -> b')
#define IS_POWER_OF_TWO(x) (((x) & ((x)-1)) == 0)
/* Left shifting a negative value became undefined behavior in C99 (downgraded
from merely implementation-defined in C89). This should still compile to the
correct thing on any two's-complement machine, but avoid ubsan warnings.*/
#define AOM_SIGNED_SHL(x, shift) ((x) * (((x)*0 + 1) << (shift)))
// These can be used to give a hint about branch outcomes.
// This can have an effect, even if your target processor has a
// good branch predictor, as these hints can affect basic block
// ordering by the compiler.
#ifdef __GNUC__
#define LIKELY(v) __builtin_expect(v, 1)
#define UNLIKELY(v) __builtin_expect(v, 0)
#else
#define LIKELY(v) (v)
#define UNLIKELY(v) (v)
#endif
typedef uint8_t qm_val_t;
#define AOM_QM_BITS 5
// Note:
// tran_low_t is the datatype used for final transform coefficients.
// tran_high_t is the datatype used for intermediate transform stages.
typedef int64_t tran_high_t;
typedef int32_t tran_low_t;
static INLINE uint8_t clip_pixel(int val) {
return (val > 255) ? 255 : (val < 0) ? 0 : val;
}
static INLINE int clamp(int value, int low, int high) {
return value < low ? low : (value > high ? high : value);
}
static INLINE int64_t clamp64(int64_t value, int64_t low, int64_t high) {
return value < low ? low : (value > high ? high : value);
}
static INLINE double fclamp(double value, double low, double high) {
return value < low ? low : (value > high ? high : value);
}
static INLINE uint16_t clip_pixel_highbd(int val, int bd) {
switch (bd) {
case 8:
default: return (uint16_t)clamp(val, 0, 255);
case 10: return (uint16_t)clamp(val, 0, 1023);
case 12: return (uint16_t)clamp(val, 0, 4095);
}
}
// The result of this branchless code is equivalent to (value < 0 ? 0 : value)
// or max(0, value) and might be faster in some cases.
// Care should be taken since the behavior of right shifting signed type
// negative value is undefined by C standards and implementation defined,
static INLINE unsigned int negative_to_zero(int value) {
return value & ~(value >> (sizeof(value) * 8 - 1));
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AOM_DSP_AOM_DSP_COMMON_H_
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