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 SkUtils_DEFINED 11#define SkUtils_DEFINED 12 13#include "SkTypes.h" 14 15/////////////////////////////////////////////////////////////////////////////// 16 17/** Similar to memset(), but it assigns a 16bit value into the buffer. 18 @param buffer The memory to have value copied into it 19 @param value The 16bit value to be copied into buffer 20 @param count The number of times value should be copied into the buffer. 21*/ 22void sk_memset16_portable(uint16_t dst[], uint16_t value, int count); 23typedef void (*SkMemset16Proc)(uint16_t dst[], uint16_t value, int count); 24SkMemset16Proc SkMemset16GetPlatformProc(); 25 26/** Similar to memset(), but it assigns a 32bit value into the buffer. 27 @param buffer The memory to have value copied into it 28 @param value The 32bit value to be copied into buffer 29 @param count The number of times value should be copied into the buffer. 30*/ 31void sk_memset32_portable(uint32_t dst[], uint32_t value, int count); 32typedef void (*SkMemset32Proc)(uint32_t dst[], uint32_t value, int count); 33SkMemset32Proc SkMemset32GetPlatformProc(); 34 35#ifndef sk_memset16 36extern SkMemset16Proc sk_memset16; 37#endif 38 39#ifndef sk_memset32 40extern SkMemset32Proc sk_memset32; 41#endif 42 43/////////////////////////////////////////////////////////////////////////////// 44 45#define kMaxBytesInUTF8Sequence 4 46 47#ifdef SK_DEBUG 48 int SkUTF8_LeadByteToCount(unsigned c); 49#else 50 #define SkUTF8_LeadByteToCount(c) ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1) 51#endif 52 53inline int SkUTF8_CountUTF8Bytes(const char utf8[]) { 54 SkASSERT(utf8); 55 return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8); 56} 57 58int SkUTF8_CountUnichars(const char utf8[]); 59int SkUTF8_CountUnichars(const char utf8[], size_t byteLength); 60SkUnichar SkUTF8_ToUnichar(const char utf8[]); 61SkUnichar SkUTF8_NextUnichar(const char**); 62SkUnichar SkUTF8_PrevUnichar(const char**); 63 64/** Return the number of bytes need to convert a unichar 65 into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence, 66 or 0 if uni is illegal. 67*/ 68size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = NULL); 69 70/////////////////////////////////////////////////////////////////////////////// 71 72#define SkUTF16_IsHighSurrogate(c) (((c) & 0xFC00) == 0xD800) 73#define SkUTF16_IsLowSurrogate(c) (((c) & 0xFC00) == 0xDC00) 74 75int SkUTF16_CountUnichars(const uint16_t utf16[]); 76int SkUTF16_CountUnichars(const uint16_t utf16[], 77 int numberOf16BitValues); 78// returns the current unichar and then moves past it (*p++) 79SkUnichar SkUTF16_NextUnichar(const uint16_t**); 80// this guy backs up to the previus unichar value, and returns it (*--p) 81SkUnichar SkUTF16_PrevUnichar(const uint16_t**); 82size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL); 83 84size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues, 85 char utf8[] = NULL); 86 87inline bool SkUnichar_IsVariationSelector(SkUnichar uni) { 88/* The 'true' ranges are: 89 * 0x180B <= uni <= 0x180D 90 * 0xFE00 <= uni <= 0xFE0F 91 * 0xE0100 <= uni <= 0xE01EF 92 */ 93 if (uni < 0x180B || uni > 0xE01EF) { 94 return false; 95 } 96 if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) { 97 return false; 98 } 99 return true; 100} 101 102/////////////////////////////////////////////////////////////////////////////// 103 104class SkAutoTrace { 105public: 106 /** NOTE: label contents are not copied, just the ptr is 107 retained, so DON'T DELETE IT. 108 */ 109 SkAutoTrace(const char label[]) : fLabel(label) { 110 SkDebugf("--- trace: %s Enter\n", fLabel); 111 } 112 ~SkAutoTrace() { 113 SkDebugf("--- trace: %s Leave\n", fLabel); 114 } 115private: 116 const char* fLabel; 117}; 118 119/////////////////////////////////////////////////////////////////////////////// 120 121class SkAutoMemoryUsageProbe { 122public: 123 /** Record memory usage in constructor, and dump the result 124 (delta and current total) in the destructor, with the optional 125 label. NOTE: label contents are not copied, just the ptr is 126 retained, so DON'T DELETE IT. 127 */ 128 SkAutoMemoryUsageProbe(const char label[]); 129 ~SkAutoMemoryUsageProbe(); 130private: 131 const char* fLabel; 132 size_t fBytesAllocated; 133}; 134 135#endif 136 137