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| 1 /* | |
| 2 * Copyright 2006 The Android Open Source Project | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef SkEndian_DEFINED | |
| 9 #define SkEndian_DEFINED | |
| 10 | |
| 11 #include "SkTypes.h" | |
| 12 | |
| 13 /** \file SkEndian.h | |
| 14 | |
| 15 Macros and helper functions for handling 16 and 32 bit values in | |
| 16 big and little endian formats. | |
| 17 */ | |
| 18 | |
| 19 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN) | |
| 20 #error "can't have both LENDIAN and BENDIAN defined" | |
| 21 #endif | |
| 22 | |
| 23 #if !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN) | |
| 24 #error "need either LENDIAN or BENDIAN defined" | |
| 25 #endif | |
| 26 | |
| 27 /** Swap the two bytes in the low 16bits of the parameters. | |
| 28 e.g. 0x1234 -> 0x3412 | |
| 29 */ | |
| 30 static inline uint16_t SkEndianSwap16(uint16_t value) { | |
| 31 return static_cast<uint16_t>((value >> 8) | (value << 8)); | |
| 32 } | |
| 33 | |
| 34 template<uint16_t N> struct SkTEndianSwap16 { | |
| 35 static const uint16_t value = static_cast<uint16_t>((N >> 8) | ((N & 0xFF) <
< 8)); | |
| 36 }; | |
| 37 | |
| 38 /** Vector version of SkEndianSwap16(), which swaps the | |
| 39 low two bytes of each value in the array. | |
| 40 */ | |
| 41 static inline void SkEndianSwap16s(uint16_t array[], int count) { | |
| 42 SkASSERT(count == 0 || array != NULL); | |
| 43 | |
| 44 while (--count >= 0) { | |
| 45 *array = SkEndianSwap16(*array); | |
| 46 array += 1; | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 /** Reverse all 4 bytes in a 32bit value. | |
| 51 e.g. 0x12345678 -> 0x78563412 | |
| 52 */ | |
| 53 static inline uint32_t SkEndianSwap32(uint32_t value) { | |
| 54 return ((value & 0xFF) << 24) | | |
| 55 ((value & 0xFF00) << 8) | | |
| 56 ((value & 0xFF0000) >> 8) | | |
| 57 (value >> 24); | |
| 58 } | |
| 59 | |
| 60 template<uint32_t N> struct SkTEndianSwap32 { | |
| 61 static const uint32_t value = ((N & 0xFF) << 24) | | |
| 62 ((N & 0xFF00) << 8) | | |
| 63 ((N & 0xFF0000) >> 8) | | |
| 64 (N >> 24); | |
| 65 }; | |
| 66 | |
| 67 /** Vector version of SkEndianSwap32(), which swaps the | |
| 68 bytes of each value in the array. | |
| 69 */ | |
| 70 static inline void SkEndianSwap32s(uint32_t array[], int count) { | |
| 71 SkASSERT(count == 0 || array != NULL); | |
| 72 | |
| 73 while (--count >= 0) { | |
| 74 *array = SkEndianSwap32(*array); | |
| 75 array += 1; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 /** Reverse all 8 bytes in a 64bit value. | |
| 80 e.g. 0x1122334455667788 -> 0x8877665544332211 | |
| 81 */ | |
| 82 static inline uint64_t SkEndianSwap64(uint64_t value) { | |
| 83 return (((value & 0x00000000000000FFULL) << (8*7)) | | |
| 84 ((value & 0x000000000000FF00ULL) << (8*5)) | | |
| 85 ((value & 0x0000000000FF0000ULL) << (8*3)) | | |
| 86 ((value & 0x00000000FF000000ULL) << (8*1)) | | |
| 87 ((value & 0x000000FF00000000ULL) >> (8*1)) | | |
| 88 ((value & 0x0000FF0000000000ULL) >> (8*3)) | | |
| 89 ((value & 0x00FF000000000000ULL) >> (8*5)) | | |
| 90 ((value) >> (8*7))); | |
| 91 } | |
| 92 template<uint64_t N> struct SkTEndianSwap64 { | |
| 93 static const uint64_t value = (((N & 0x00000000000000FFULL) << (8*7)) | | |
| 94 ((N & 0x000000000000FF00ULL) << (8*5)) | | |
| 95 ((N & 0x0000000000FF0000ULL) << (8*3)) | | |
| 96 ((N & 0x00000000FF000000ULL) << (8*1)) | | |
| 97 ((N & 0x000000FF00000000ULL) >> (8*1)) | | |
| 98 ((N & 0x0000FF0000000000ULL) >> (8*3)) | | |
| 99 ((N & 0x00FF000000000000ULL) >> (8*5)) | | |
| 100 ((N) >> (8*7))); | |
| 101 }; | |
| 102 | |
| 103 /** Vector version of SkEndianSwap64(), which swaps the | |
| 104 bytes of each value in the array. | |
| 105 */ | |
| 106 static inline void SkEndianSwap64s(uint64_t array[], int count) { | |
| 107 SkASSERT(count == 0 || array != NULL); | |
| 108 | |
| 109 while (--count >= 0) { | |
| 110 *array = SkEndianSwap64(*array); | |
| 111 array += 1; | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 #ifdef SK_CPU_LENDIAN | |
| 116 #define SkEndian_SwapBE16(n) SkEndianSwap16(n) | |
| 117 #define SkEndian_SwapBE32(n) SkEndianSwap32(n) | |
| 118 #define SkEndian_SwapBE64(n) SkEndianSwap64(n) | |
| 119 #define SkEndian_SwapLE16(n) (n) | |
| 120 #define SkEndian_SwapLE32(n) (n) | |
| 121 #define SkEndian_SwapLE64(n) (n) | |
| 122 | |
| 123 #define SkTEndian_SwapBE16(n) SkTEndianSwap16<n>::value | |
| 124 #define SkTEndian_SwapBE32(n) SkTEndianSwap32<n>::value | |
| 125 #define SkTEndian_SwapBE64(n) SkTEndianSwap64<n>::value | |
| 126 #define SkTEndian_SwapLE16(n) (n) | |
| 127 #define SkTEndian_SwapLE32(n) (n) | |
| 128 #define SkTEndian_SwapLE64(n) (n) | |
| 129 #else // SK_CPU_BENDIAN | |
| 130 #define SkEndian_SwapBE16(n) (n) | |
| 131 #define SkEndian_SwapBE32(n) (n) | |
| 132 #define SkEndian_SwapBE64(n) (n) | |
| 133 #define SkEndian_SwapLE16(n) SkEndianSwap16(n) | |
| 134 #define SkEndian_SwapLE32(n) SkEndianSwap32(n) | |
| 135 #define SkEndian_SwapLE64(n) SkEndianSwap64(n) | |
| 136 | |
| 137 #define SkTEndian_SwapBE16(n) (n) | |
| 138 #define SkTEndian_SwapBE32(n) (n) | |
| 139 #define SkTEndian_SwapBE64(n) (n) | |
| 140 #define SkTEndian_SwapLE16(n) SkTEndianSwap16<n>::value | |
| 141 #define SkTEndian_SwapLE32(n) SkTEndianSwap32<n>::value | |
| 142 #define SkTEndian_SwapLE64(n) SkTEndianSwap64<n>::value | |
| 143 #endif | |
| 144 | |
| 145 // When a bytestream is embedded in a 32-bit word, how far we need to | |
| 146 // shift the word to extract each byte from the low 8 bits by anding with 0xff. | |
| 147 #ifdef SK_CPU_LENDIAN | |
| 148 #define SkEndian_Byte0Shift 0 | |
| 149 #define SkEndian_Byte1Shift 8 | |
| 150 #define SkEndian_Byte2Shift 16 | |
| 151 #define SkEndian_Byte3Shift 24 | |
| 152 #else // SK_CPU_BENDIAN | |
| 153 #define SkEndian_Byte0Shift 24 | |
| 154 #define SkEndian_Byte1Shift 16 | |
| 155 #define SkEndian_Byte2Shift 8 | |
| 156 #define SkEndian_Byte3Shift 0 | |
| 157 #endif | |
| 158 | |
| 159 | |
| 160 #if defined(SK_UINT8_BITFIELD_LENDIAN) && defined(SK_UINT8_BITFIELD_BENDIAN) | |
| 161 #error "can't have both bitfield LENDIAN and BENDIAN defined" | |
| 162 #endif | |
| 163 | |
| 164 #if !defined(SK_UINT8_BITFIELD_LENDIAN) && !defined(SK_UINT8_BITFIELD_BENDIAN) | |
| 165 #ifdef SK_CPU_LENDIAN | |
| 166 #define SK_UINT8_BITFIELD_LENDIAN | |
| 167 #else | |
| 168 #define SK_UINT8_BITFIELD_BENDIAN | |
| 169 #endif | |
| 170 #endif | |
| 171 | |
| 172 #ifdef SK_UINT8_BITFIELD_LENDIAN | |
| 173 #define SK_UINT8_BITFIELD(f0, f1, f2, f3, f4, f5, f6, f7) \ | |
| 174 SK_OT_BYTE f0 : 1; \ | |
| 175 SK_OT_BYTE f1 : 1; \ | |
| 176 SK_OT_BYTE f2 : 1; \ | |
| 177 SK_OT_BYTE f3 : 1; \ | |
| 178 SK_OT_BYTE f4 : 1; \ | |
| 179 SK_OT_BYTE f5 : 1; \ | |
| 180 SK_OT_BYTE f6 : 1; \ | |
| 181 SK_OT_BYTE f7 : 1; | |
| 182 #else | |
| 183 #define SK_UINT8_BITFIELD(f0, f1, f2, f3, f4, f5, f6, f7) \ | |
| 184 SK_OT_BYTE f7 : 1; \ | |
| 185 SK_OT_BYTE f6 : 1; \ | |
| 186 SK_OT_BYTE f5 : 1; \ | |
| 187 SK_OT_BYTE f4 : 1; \ | |
| 188 SK_OT_BYTE f3 : 1; \ | |
| 189 SK_OT_BYTE f2 : 1; \ | |
| 190 SK_OT_BYTE f1 : 1; \ | |
| 191 SK_OT_BYTE f0 : 1; | |
| 192 #endif | |
| 193 | |
| 194 #endif | |
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Chromium Code Reviews
Issue 1290733002:
Revert[3] "move some public headers into private" (Closed)
Base URL: https://skia.googlesource.com/skia.git@master