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 13 /////////////////////////////////////////////////////////////////////////////// 14 15 /** Similar to memset(), but it assigns a 16bit value into the buffer. 16 @param buffer The memory to have value copied into it 17 @param value The 16bit value to be copied into buffer 18 @param count The number of times value should be copied into the buffer. 19 */ 20 void sk_memset16_portable(uint16_t dst[], uint16_t value, int count); 21 typedef void (*SkMemset16Proc)(uint16_t dst[], uint16_t value, int count); 22 SkMemset16Proc SkMemset16GetPlatformProc(); 23 24 /** Similar to memset(), but it assigns a 32bit value into the buffer. 25 @param buffer The memory to have value copied into it 26 @param value The 32bit value to be copied into buffer 27 @param count The number of times value should be copied into the buffer. 28 */ 29 void sk_memset32_portable(uint32_t dst[], uint32_t value, int count); 30 typedef void (*SkMemset32Proc)(uint32_t dst[], uint32_t value, int count); 31 SkMemset32Proc SkMemset32GetPlatformProc(); 32 33 #ifndef sk_memset16 34 extern SkMemset16Proc sk_memset16; 35 #endif 36 37 #ifndef sk_memset32 38 extern SkMemset32Proc sk_memset32; 39 #endif 40 41 /////////////////////////////////////////////////////////////////////////////// 42 43 #define kMaxBytesInUTF8Sequence 4 44 45 #ifdef SK_DEBUG 46 int SkUTF8_LeadByteToCount(unsigned c); 47 #else 48 #define SkUTF8_LeadByteToCount(c) ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1) 49 #endif 50 51 inline int SkUTF8_CountUTF8Bytes(const char utf8[]) { 52 SkASSERT(utf8); 53 return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8); 54 } 55 56 int SkUTF8_CountUnichars(const char utf8[]); 57 int SkUTF8_CountUnichars(const char utf8[], size_t byteLength); 58 SkUnichar SkUTF8_ToUnichar(const char utf8[]); 59 SkUnichar SkUTF8_NextUnichar(const char**); 60 SkUnichar SkUTF8_PrevUnichar(const char**); 61 62 /** Return the number of bytes need to convert a unichar 63 into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence, 64 or 0 if uni is illegal. 65 */ 66 size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = NULL); 67 68 /////////////////////////////////////////////////////////////////////////////// 69 70 #define SkUTF16_IsHighSurrogate(c) (((c) & 0xFC00) == 0xD800) 71 #define SkUTF16_IsLowSurrogate(c) (((c) & 0xFC00) == 0xDC00) 72 73 int SkUTF16_CountUnichars(const uint16_t utf16[]); 74 int SkUTF16_CountUnichars(const uint16_t utf16[], int numberOf16BitValues); 75 // returns the current unichar and then moves past it (*p++) 76 SkUnichar SkUTF16_NextUnichar(const uint16_t**); 77 // this guy backs up to the previus unichar value, and returns it (*--p) 78 SkUnichar SkUTF16_PrevUnichar(const uint16_t**); 79 size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL); 80 81 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues, 82 char utf8[] = NULL); 83 84 inline bool SkUnichar_IsVariationSelector(SkUnichar uni) { 85 /* The 'true' ranges are: 86 * 0x180B <= uni <= 0x180D 87 * 0xFE00 <= uni <= 0xFE0F 88 * 0xE0100 <= uni <= 0xE01EF 89 */ 90 if (uni < 0x180B || uni > 0xE01EF) { 91 return false; 92 } 93 if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) { 94 return false; 95 } 96 return true; 97 } 98 99 /////////////////////////////////////////////////////////////////////////////// 100 101 class SkAutoTrace { 102 public: 103 /** NOTE: label contents are not copied, just the ptr is 104 retained, so DON'T DELETE IT. 105 */ 106 SkAutoTrace(const char label[]) : fLabel(label) { 107 SkDebugf("--- trace: %s Enter\n", fLabel); 108 } 109 ~SkAutoTrace() { 110 SkDebugf("--- trace: %s Leave\n", fLabel); 111 } 112 private: 113 const char* fLabel; 114 }; 115 #define SkAutoTrace(...) SK_REQUIRE_LOCAL_VAR(SkAutoTrace) 116 117 #endif 118
