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 SkUtils_DEFINED 9 #define SkUtils_DEFINED 10 11 #include "SkTypes.h" 12 #include "SkMath.h" 13 #include "SkOpts.h" 14 15 /** Similar to memset(), but it assigns a 16, 32, or 64-bit value into the buffer. 16 @param buffer The memory to have value copied into it 17 @param value The value to be copied into buffer 18 @param count The number of times value should be copied into the buffer. 19 */ 20 static inline void sk_memset16(uint16_t buffer[], uint16_t value, int count) { 21 SkOpts::memset16(buffer, value, count); 22 } 23 static inline void sk_memset32(uint32_t buffer[], uint32_t value, int count) { 24 SkOpts::memset32(buffer, value, count); 25 } 26 static inline void sk_memset64(uint64_t buffer[], uint64_t value, int count) { 27 SkOpts::memset64(buffer, value, count); 28 } 29 /////////////////////////////////////////////////////////////////////////////// 30 31 #define kMaxBytesInUTF8Sequence 4 32 33 #ifdef SK_DEBUG 34 int SkUTF8_LeadByteToCount(unsigned c); 35 #else 36 #define SkUTF8_LeadByteToCount(c) ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1) 37 #endif 38 39 inline int SkUTF8_CountUTF8Bytes(const char utf8[]) { 40 SkASSERT(utf8); 41 return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8); 42 } 43 44 int SkUTF8_CountUnichars(const char utf8[]); 45 46 /** These functions are safe: invalid sequences will return -1; */ 47 int SkUTF8_CountUnichars(const void* utf8, size_t byteLength); 48 int SkUTF16_CountUnichars(const void* utf16, size_t byteLength); 49 int SkUTF32_CountUnichars(const void* utf32, size_t byteLength); 50 51 /** This function is safe: invalid UTF8 sequences will return -1 52 * When -1 is returned, ptr is unchanged. 53 * Precondition: *ptr < end; 54 */ 55 SkUnichar SkUTF8_NextUnicharWithError(const char** ptr, const char* end); 56 57 /** this version replaces invalid utf-8 sequences with code point U+FFFD. */ 58 inline SkUnichar SkUTF8_NextUnichar(const char** ptr, const char* end) { 59 SkUnichar val = SkUTF8_NextUnicharWithError(ptr, end); 60 if (val < 0) { 61 *ptr = end; 62 return 0xFFFD; // REPLACEMENT CHARACTER 63 } 64 return val; 65 } 66 67 SkUnichar SkUTF8_ToUnichar(const char utf8[]); 68 SkUnichar SkUTF8_NextUnichar(const char**); 69 SkUnichar SkUTF8_PrevUnichar(const char**); 70 71 /** Return the number of bytes need to convert a unichar 72 into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence, 73 or 0 if uni is illegal. 74 */ 75 size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = nullptr); 76 77 /////////////////////////////////////////////////////////////////////////////// 78 79 #define SkUTF16_IsHighSurrogate(c) (((c) & 0xFC00) == 0xD800) 80 #define SkUTF16_IsLowSurrogate(c) (((c) & 0xFC00) == 0xDC00) 81 82 int SkUTF16_CountUnichars(const uint16_t utf16[]); 83 // returns the current unichar and then moves past it (*p++) 84 SkUnichar SkUTF16_NextUnichar(const uint16_t**); 85 // this guy backs up to the previus unichar value, and returns it (*--p) 86 SkUnichar SkUTF16_PrevUnichar(const uint16_t**); 87 size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = nullptr); 88 89 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues, 90 char utf8[] = nullptr); 91 92 inline bool SkUnichar_IsVariationSelector(SkUnichar uni) { 93 /* The 'true' ranges are: 94 * 0x180B <= uni <= 0x180D 95 * 0xFE00 <= uni <= 0xFE0F 96 * 0xE0100 <= uni <= 0xE01EF 97 */ 98 if (uni < 0x180B || uni > 0xE01EF) { 99 return false; 100 } 101 if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) { 102 return false; 103 } 104 return true; 105 } 106 107 namespace SkHexadecimalDigits { 108 extern const char gUpper[16]; // 0-9A-F 109 extern const char gLower[16]; // 0-9a-f 110 } 111 112 #endif 113
