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comparison: gfx/skia/trunk/include/core/SkEndian.h
gfx/skia/trunk/include/core/SkEndian.h
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| -1:000000000000 | 0:53a2bf7d60b8 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #ifndef SkEndian_DEFINED | |
| 11 #define SkEndian_DEFINED | |
| 12 | |
| 13 #include "SkTypes.h" | |
| 14 | |
| 15 /** \file SkEndian.h | |
| 16 | |
| 17 Macros and helper functions for handling 16 and 32 bit values in | |
| 18 big and little endian formats. | |
| 19 */ | |
| 20 | |
| 21 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN) | |
| 22 #error "can't have both LENDIAN and BENDIAN defined" | |
| 23 #endif | |
| 24 | |
| 25 #if !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN) | |
| 26 #error "need either LENDIAN or BENDIAN defined" | |
| 27 #endif | |
| 28 | |
| 29 /** Swap the two bytes in the low 16bits of the parameters. | |
| 30 e.g. 0x1234 -> 0x3412 | |
| 31 */ | |
| 32 static inline uint16_t SkEndianSwap16(U16CPU value) { | |
| 33 SkASSERT(value == (uint16_t)value); | |
| 34 return static_cast<uint16_t>((value >> 8) | (value << 8)); | |
| 35 } | |
| 36 template<uint16_t N> struct SkTEndianSwap16 { | |
| 37 static const uint16_t value = static_cast<uint16_t>((N >> 8) | ((N & 0xFF) << 8)); | |
| 38 }; | |
| 39 | |
| 40 /** Vector version of SkEndianSwap16(), which swaps the | |
| 41 low two bytes of each value in the array. | |
| 42 */ | |
| 43 static inline void SkEndianSwap16s(uint16_t array[], int count) { | |
| 44 SkASSERT(count == 0 || array != NULL); | |
| 45 | |
| 46 while (--count >= 0) { | |
| 47 *array = SkEndianSwap16(*array); | |
| 48 array += 1; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 /** Reverse all 4 bytes in a 32bit value. | |
| 53 e.g. 0x12345678 -> 0x78563412 | |
| 54 */ | |
| 55 static inline uint32_t SkEndianSwap32(uint32_t value) { | |
| 56 return ((value & 0xFF) << 24) | | |
| 57 ((value & 0xFF00) << 8) | | |
| 58 ((value & 0xFF0000) >> 8) | | |
| 59 (value >> 24); | |
| 60 } | |
| 61 template<uint32_t N> struct SkTEndianSwap32 { | |
| 62 static const uint32_t value = ((N & 0xFF) << 24) | | |
| 63 ((N & 0xFF00) << 8) | | |
| 64 ((N & 0xFF0000) >> 8) | | |
| 65 (N >> 24); | |
| 66 }; | |
| 67 | |
| 68 /** Vector version of SkEndianSwap32(), which swaps the | |
| 69 bytes of each value in the array. | |
| 70 */ | |
| 71 static inline void SkEndianSwap32s(uint32_t array[], int count) { | |
| 72 SkASSERT(count == 0 || array != NULL); | |
| 73 | |
| 74 while (--count >= 0) { | |
| 75 *array = SkEndianSwap32(*array); | |
| 76 array += 1; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /** Reverse all 8 bytes in a 64bit value. | |
| 81 e.g. 0x1122334455667788 -> 0x8877665544332211 | |
| 82 */ | |
| 83 static inline uint64_t SkEndianSwap64(uint64_t value) { | |
| 84 return (((value & 0x00000000000000FFULL) << (8*7)) | | |
| 85 ((value & 0x000000000000FF00ULL) << (8*5)) | | |
| 86 ((value & 0x0000000000FF0000ULL) << (8*3)) | | |
| 87 ((value & 0x00000000FF000000ULL) << (8*1)) | | |
| 88 ((value & 0x000000FF00000000ULL) >> (8*1)) | | |
| 89 ((value & 0x0000FF0000000000ULL) >> (8*3)) | | |
| 90 ((value & 0x00FF000000000000ULL) >> (8*5)) | | |
| 91 ((value) >> (8*7))); | |
| 92 } | |
| 93 template<uint64_t N> struct SkTEndianSwap64 { | |
| 94 static const uint64_t value = (((N & 0x00000000000000FFULL) << (8*7)) | | |
| 95 ((N & 0x000000000000FF00ULL) << (8*5)) | | |
| 96 ((N & 0x0000000000FF0000ULL) << (8*3)) | | |
| 97 ((N & 0x00000000FF000000ULL) << (8*1)) | | |
| 98 ((N & 0x000000FF00000000ULL) >> (8*1)) | | |
| 99 ((N & 0x0000FF0000000000ULL) >> (8*3)) | | |
| 100 ((N & 0x00FF000000000000ULL) >> (8*5)) | | |
| 101 ((N) >> (8*7))); | |
| 102 }; | |
| 103 | |
| 104 /** Vector version of SkEndianSwap64(), which swaps the | |
| 105 bytes of each value in the array. | |
| 106 */ | |
| 107 static inline void SkEndianSwap64s(uint64_t array[], int count) { | |
| 108 SkASSERT(count == 0 || array != NULL); | |
| 109 | |
| 110 while (--count >= 0) { | |
| 111 *array = SkEndianSwap64(*array); | |
| 112 array += 1; | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 #ifdef SK_CPU_LENDIAN | |
| 117 #define SkEndian_SwapBE16(n) SkEndianSwap16(n) | |
| 118 #define SkEndian_SwapBE32(n) SkEndianSwap32(n) | |
| 119 #define SkEndian_SwapBE64(n) SkEndianSwap64(n) | |
| 120 #define SkEndian_SwapLE16(n) (n) | |
| 121 #define SkEndian_SwapLE32(n) (n) | |
| 122 #define SkEndian_SwapLE64(n) (n) | |
| 123 | |
| 124 #define SkTEndian_SwapBE16(n) SkTEndianSwap16<n>::value | |
| 125 #define SkTEndian_SwapBE32(n) SkTEndianSwap32<n>::value | |
| 126 #define SkTEndian_SwapBE64(n) SkTEndianSwap64<n>::value | |
| 127 #define SkTEndian_SwapLE16(n) (n) | |
| 128 #define SkTEndian_SwapLE32(n) (n) | |
| 129 #define SkTEndian_SwapLE64(n) (n) | |
| 130 #else // SK_CPU_BENDIAN | |
| 131 #define SkEndian_SwapBE16(n) (n) | |
| 132 #define SkEndian_SwapBE32(n) (n) | |
| 133 #define SkEndian_SwapBE64(n) (n) | |
| 134 #define SkEndian_SwapLE16(n) SkEndianSwap16(n) | |
| 135 #define SkEndian_SwapLE32(n) SkEndianSwap32(n) | |
| 136 #define SkEndian_SwapLE64(n) SkEndianSwap64(n) | |
| 137 | |
| 138 #define SkTEndian_SwapBE16(n) (n) | |
| 139 #define SkTEndian_SwapBE32(n) (n) | |
| 140 #define SkTEndian_SwapBE64(n) (n) | |
| 141 #define SkTEndian_SwapLE16(n) SkTEndianSwap16<n>::value | |
| 142 #define SkTEndian_SwapLE32(n) SkTEndianSwap32<n>::value | |
| 143 #define SkTEndian_SwapLE64(n) SkTEndianSwap64<n>::value | |
| 144 #endif | |
| 145 | |
| 146 // When a bytestream is embedded in a 32-bit word, how far we need to | |
| 147 // shift the word to extract each byte from the low 8 bits by anding with 0xff. | |
| 148 #ifdef SK_CPU_LENDIAN | |
| 149 #define SkEndian_Byte0Shift 0 | |
| 150 #define SkEndian_Byte1Shift 8 | |
| 151 #define SkEndian_Byte2Shift 16 | |
| 152 #define SkEndian_Byte3Shift 24 | |
| 153 #else // SK_CPU_BENDIAN | |
| 154 #define SkEndian_Byte0Shift 24 | |
| 155 #define SkEndian_Byte1Shift 16 | |
| 156 #define SkEndian_Byte2Shift 8 | |
| 157 #define SkEndian_Byte3Shift 0 | |
| 158 #endif | |
| 159 | |
| 160 | |
| 161 #if defined(SK_UINT8_BITFIELD_LENDIAN) && defined(SK_UINT8_BITFIELD_BENDIAN) | |
| 162 #error "can't have both bitfield LENDIAN and BENDIAN defined" | |
| 163 #endif | |
| 164 | |
| 165 #if !defined(SK_UINT8_BITFIELD_LENDIAN) && !defined(SK_UINT8_BITFIELD_BENDIAN) | |
| 166 #ifdef SK_CPU_LENDIAN | |
| 167 #define SK_UINT8_BITFIELD_LENDIAN | |
| 168 #else | |
| 169 #define SK_UINT8_BITFIELD_BENDIAN | |
| 170 #endif | |
| 171 #endif | |
| 172 | |
| 173 #ifdef SK_UINT8_BITFIELD_LENDIAN | |
| 174 #define SK_UINT8_BITFIELD(f0, f1, f2, f3, f4, f5, f6, f7) \ | |
| 175 SK_OT_BYTE f0 : 1; \ | |
| 176 SK_OT_BYTE f1 : 1; \ | |
| 177 SK_OT_BYTE f2 : 1; \ | |
| 178 SK_OT_BYTE f3 : 1; \ | |
| 179 SK_OT_BYTE f4 : 1; \ | |
| 180 SK_OT_BYTE f5 : 1; \ | |
| 181 SK_OT_BYTE f6 : 1; \ | |
| 182 SK_OT_BYTE f7 : 1; | |
| 183 #else | |
| 184 #define SK_UINT8_BITFIELD(f0, f1, f2, f3, f4, f5, f6, f7) \ | |
| 185 SK_OT_BYTE f7 : 1; \ | |
| 186 SK_OT_BYTE f6 : 1; \ | |
| 187 SK_OT_BYTE f5 : 1; \ | |
| 188 SK_OT_BYTE f4 : 1; \ | |
| 189 SK_OT_BYTE f3 : 1; \ | |
| 190 SK_OT_BYTE f2 : 1; \ | |
| 191 SK_OT_BYTE f1 : 1; \ | |
| 192 SK_OT_BYTE f0 : 1; | |
| 193 #endif | |
| 194 | |
| 195 #endif |
