| /* |
| * 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 |
| |
| #define PI 3.141592653589793238462643383279502884 |
| |
| #define AOMMIN(x, y) (((x) < (y)) ? (x) : (y)) |
| #define AOMMAX(x, y) (((x) > (y)) ? (x) : (y)) |
| #define AOMSIGN(x) ((x) < 0 ? -1 : 0) |
| |
| #define NELEMENTS(x) (int)(sizeof(x) / sizeof(x[0])) |
| |
| #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_ |