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1 | |
2 /* | 1 /* |
3 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
4 * | 3 * |
5 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 5 * found in the LICENSE file. |
7 */ | 6 */ |
8 | 7 |
9 | |
10 #ifndef SkEndian_DEFINED | 8 #ifndef SkEndian_DEFINED |
11 #define SkEndian_DEFINED | 9 #define SkEndian_DEFINED |
12 | 10 |
13 #include "SkTypes.h" | 11 #include "SkTypes.h" |
14 | 12 |
15 /** \file SkEndian.h | 13 /** \file SkEndian.h |
16 | 14 |
17 Macros and helper functions for handling 16 and 32 bit values in | 15 Macros and helper functions for handling 16 and 32 bit values in |
18 big and little endian formats. | 16 big and little endian formats. |
19 */ | 17 */ |
20 | 18 |
21 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN) | 19 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN) |
22 #error "can't have both LENDIAN and BENDIAN defined" | 20 #error "can't have both LENDIAN and BENDIAN defined" |
23 #endif | 21 #endif |
24 | 22 |
25 #if !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN) | 23 #if !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN) |
26 #error "need either LENDIAN or BENDIAN defined" | 24 #error "need either LENDIAN or BENDIAN defined" |
27 #endif | 25 #endif |
28 | 26 |
29 /** Swap the two bytes in the low 16bits of the parameters. | 27 /** Swap the two bytes in the low 16bits of the parameters. |
30 e.g. 0x1234 -> 0x3412 | 28 e.g. 0x1234 -> 0x3412 |
31 */ | 29 */ |
32 static inline uint16_t SkEndianSwap16(U16CPU value) { | 30 static inline uint16_t SkEndianSwap16(uint16_t value) { |
33 SkASSERT(value == (uint16_t)value); | |
34 return static_cast<uint16_t>((value >> 8) | (value << 8)); | 31 return static_cast<uint16_t>((value >> 8) | (value << 8)); |
35 } | 32 } |
| 33 |
36 template<uint16_t N> struct SkTEndianSwap16 { | 34 template<uint16_t N> struct SkTEndianSwap16 { |
37 static const uint16_t value = static_cast<uint16_t>((N >> 8) | ((N & 0xFF) <
< 8)); | 35 static const uint16_t value = static_cast<uint16_t>((N >> 8) | ((N & 0xFF) <
< 8)); |
38 }; | 36 }; |
39 | 37 |
40 /** Vector version of SkEndianSwap16(), which swaps the | 38 /** Vector version of SkEndianSwap16(), which swaps the |
41 low two bytes of each value in the array. | 39 low two bytes of each value in the array. |
42 */ | 40 */ |
43 static inline void SkEndianSwap16s(uint16_t array[], int count) { | 41 static inline void SkEndianSwap16s(uint16_t array[], int count) { |
44 SkASSERT(count == 0 || array != NULL); | 42 SkASSERT(count == 0 || array != NULL); |
45 | 43 |
46 while (--count >= 0) { | 44 while (--count >= 0) { |
47 *array = SkEndianSwap16(*array); | 45 *array = SkEndianSwap16(*array); |
48 array += 1; | 46 array += 1; |
49 } | 47 } |
50 } | 48 } |
51 | 49 |
52 /** Reverse all 4 bytes in a 32bit value. | 50 /** Reverse all 4 bytes in a 32bit value. |
53 e.g. 0x12345678 -> 0x78563412 | 51 e.g. 0x12345678 -> 0x78563412 |
54 */ | 52 */ |
55 static inline uint32_t SkEndianSwap32(uint32_t value) { | 53 static inline uint32_t SkEndianSwap32(uint32_t value) { |
56 return ((value & 0xFF) << 24) | | 54 return ((value & 0xFF) << 24) | |
57 ((value & 0xFF00) << 8) | | 55 ((value & 0xFF00) << 8) | |
58 ((value & 0xFF0000) >> 8) | | 56 ((value & 0xFF0000) >> 8) | |
59 (value >> 24); | 57 (value >> 24); |
60 } | 58 } |
| 59 |
61 template<uint32_t N> struct SkTEndianSwap32 { | 60 template<uint32_t N> struct SkTEndianSwap32 { |
62 static const uint32_t value = ((N & 0xFF) << 24) | | 61 static const uint32_t value = ((N & 0xFF) << 24) | |
63 ((N & 0xFF00) << 8) | | 62 ((N & 0xFF00) << 8) | |
64 ((N & 0xFF0000) >> 8) | | 63 ((N & 0xFF0000) >> 8) | |
65 (N >> 24); | 64 (N >> 24); |
66 }; | 65 }; |
67 | 66 |
68 /** Vector version of SkEndianSwap32(), which swaps the | 67 /** Vector version of SkEndianSwap32(), which swaps the |
69 bytes of each value in the array. | 68 bytes of each value in the array. |
70 */ | 69 */ |
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186 SK_OT_BYTE f6 : 1; \ | 185 SK_OT_BYTE f6 : 1; \ |
187 SK_OT_BYTE f5 : 1; \ | 186 SK_OT_BYTE f5 : 1; \ |
188 SK_OT_BYTE f4 : 1; \ | 187 SK_OT_BYTE f4 : 1; \ |
189 SK_OT_BYTE f3 : 1; \ | 188 SK_OT_BYTE f3 : 1; \ |
190 SK_OT_BYTE f2 : 1; \ | 189 SK_OT_BYTE f2 : 1; \ |
191 SK_OT_BYTE f1 : 1; \ | 190 SK_OT_BYTE f1 : 1; \ |
192 SK_OT_BYTE f0 : 1; | 191 SK_OT_BYTE f0 : 1; |
193 #endif | 192 #endif |
194 | 193 |
195 #endif | 194 #endif |
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