1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AOM_DSP_AOM_DSP_COMMON_H_ 13 #define AOM_AOM_DSP_AOM_DSP_COMMON_H_ 14 15 #include "config/aom_config.h" 16 17 #include "aom/aom_integer.h" 18 #include "aom_ports/mem.h" 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 #ifndef MAX_SB_SIZE 25 #define MAX_SB_SIZE 128 26 #endif // ndef MAX_SB_SIZE 27 28 #define AOMMIN(x, y) (((x) < (y)) ? (x) : (y)) 29 #define AOMMAX(x, y) (((x) > (y)) ? (x) : (y)) 30 31 #define IMPLIES(a, b) (!(a) || (b)) // Logical 'a implies b' (or 'a -> b') 32 33 #define IS_POWER_OF_TWO(x) (((x) & ((x)-1)) == 0) 34 35 /* Left shifting a negative value became undefined behavior in C99 (downgraded 36 from merely implementation-defined in C89). This should still compile to the 37 correct thing on any two's-complement machine, but avoid ubsan warnings.*/ 38 #define AOM_SIGNED_SHL(x, shift) ((x) * (((x)*0 + 1) << (shift))) 39 40 // These can be used to give a hint about branch outcomes. 41 // This can have an effect, even if your target processor has a 42 // good branch predictor, as these hints can affect basic block 43 // ordering by the compiler. 44 #ifdef __GNUC__ 45 #define LIKELY(v) __builtin_expect(v, 1) 46 #define UNLIKELY(v) __builtin_expect(v, 0) 47 #else 48 #define LIKELY(v) (v) 49 #define UNLIKELY(v) (v) 50 #endif 51 52 typedef uint8_t qm_val_t; 53 #define AOM_QM_BITS 5 54 55 // Note: 56 // tran_low_t is the datatype used for final transform coefficients. 57 // tran_high_t is the datatype used for intermediate transform stages. 58 typedef int64_t tran_high_t; 59 typedef int32_t tran_low_t; 60 61 static INLINE uint8_t clip_pixel(int val) { 62 return (val > 255) ? 255 : (val < 0) ? 0 : val; 63 } 64 65 static INLINE int clamp(int value, int low, int high) { 66 return value < low ? low : (value > high ? high : value); 67 } 68 69 static INLINE int64_t clamp64(int64_t value, int64_t low, int64_t high) { 70 return value < low ? low : (value > high ? high : value); 71 } 72 73 static INLINE double fclamp(double value, double low, double high) { 74 return value < low ? low : (value > high ? high : value); 75 } 76 77 static INLINE uint16_t clip_pixel_highbd(int val, int bd) { 78 switch (bd) { 79 case 8: 80 default: return (uint16_t)clamp(val, 0, 255); 81 case 10: return (uint16_t)clamp(val, 0, 1023); 82 case 12: return (uint16_t)clamp(val, 0, 4095); 83 } 84 } 85 86 // The result of this branchless code is equivalent to (value < 0 ? 0 : value) 87 // or max(0, value) and might be faster in some cases. 88 // Care should be taken since the behavior of right shifting signed type 89 // negative value is undefined by C standards and implementation defined, 90 static INLINE unsigned int negative_to_zero(int value) { 91 return value & ~(value >> (sizeof(value) * 8 - 1)); 92 } 93 94 #ifdef __cplusplus 95 } // extern "C" 96 #endif 97 98 #endif // AOM_AOM_DSP_AOM_DSP_COMMON_H_ 99
