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 // Determined empirically using bench/MemsetBench.cpp on a Nexus 7, Nexus 9, and desktop.
16 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 || defined(SK_ARM_HAS_NEON)
17 // Platforms where we can assume an autovectorizer will give us a good inline memset.
18 #define SK_SMALL_MEMSET 1000
19 #else
20 // Platforms like Chrome on ARMv7 that don't typically compile with NEON globally.
21 #define SK_SMALL_MEMSET 10
22 #endif
23
24
25 /** Similar to memset(), but it assigns a 16bit value into the buffer.
26 @param buffer The memory to have value copied into it
27 @param value The 16bit value to be copied into buffer
28 @param count The number of times value should be copied into the buffer.
29 */
30 void sk_memset16_large(uint16_t dst[], uint16_t value, int count);
sk_memset16(uint16_t dst[],uint16_t value,int count)31 inline void sk_memset16(uint16_t dst[], uint16_t value, int count) {
32 if (count <= SK_SMALL_MEMSET) {
33 for (int i = 0; i < count; i++) {
34 dst[i] = value;
35 }
36 } else {
37 sk_memset16_large(dst, value, count);
38 }
39 }
40 typedef void (*SkMemset16Proc)(uint16_t dst[], uint16_t value, int count);
41 SkMemset16Proc SkMemset16GetPlatformProc();
42
43 /** Similar to memset(), but it assigns a 32bit value into the buffer.
44 @param buffer The memory to have value copied into it
45 @param value The 32bit value to be copied into buffer
46 @param count The number of times value should be copied into the buffer.
47 */
48 void sk_memset32_large(uint32_t dst[], uint32_t value, int count);
sk_memset32(uint32_t dst[],uint32_t value,int count)49 inline void sk_memset32(uint32_t dst[], uint32_t value, int count) {
50 if (count <= SK_SMALL_MEMSET) {
51 for (int i = 0; i < count; i++) {
52 dst[i] = value;
53 }
54 } else {
55 sk_memset32_large(dst, value, count);
56 }
57 }
58
59 typedef void (*SkMemset32Proc)(uint32_t dst[], uint32_t value, int count);
60 SkMemset32Proc SkMemset32GetPlatformProc();
61
62 #undef SK_SMALL_MEMSET
63
64 /** Similar to memcpy(), but it copies count 32bit values from src to dst.
65 @param dst The memory to have value copied into it
66 @param src The memory to have value copied from it
67 @param count The number of values should be copied.
68 */
69 void sk_memcpy32(uint32_t dst[], const uint32_t src[], int count);
70 typedef void (*SkMemcpy32Proc)(uint32_t dst[], const uint32_t src[], int count);
71 SkMemcpy32Proc SkMemcpy32GetPlatformProc();
72
73 ///////////////////////////////////////////////////////////////////////////////
74
75 #define kMaxBytesInUTF8Sequence 4
76
77 #ifdef SK_DEBUG
78 int SkUTF8_LeadByteToCount(unsigned c);
79 #else
80 #define SkUTF8_LeadByteToCount(c) ((((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1)
81 #endif
82
SkUTF8_CountUTF8Bytes(const char utf8[])83 inline int SkUTF8_CountUTF8Bytes(const char utf8[]) {
84 SkASSERT(utf8);
85 return SkUTF8_LeadByteToCount(*(const uint8_t*)utf8);
86 }
87
88 int SkUTF8_CountUnichars(const char utf8[]);
89 int SkUTF8_CountUnichars(const char utf8[], size_t byteLength);
90 SkUnichar SkUTF8_ToUnichar(const char utf8[]);
91 SkUnichar SkUTF8_NextUnichar(const char**);
92 SkUnichar SkUTF8_PrevUnichar(const char**);
93
94 /** Return the number of bytes need to convert a unichar
95 into a utf8 sequence. Will be 1..kMaxBytesInUTF8Sequence,
96 or 0 if uni is illegal.
97 */
98 size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[] = NULL);
99
100 ///////////////////////////////////////////////////////////////////////////////
101
102 #define SkUTF16_IsHighSurrogate(c) (((c) & 0xFC00) == 0xD800)
103 #define SkUTF16_IsLowSurrogate(c) (((c) & 0xFC00) == 0xDC00)
104
105 int SkUTF16_CountUnichars(const uint16_t utf16[]);
106 int SkUTF16_CountUnichars(const uint16_t utf16[], int numberOf16BitValues);
107 // returns the current unichar and then moves past it (*p++)
108 SkUnichar SkUTF16_NextUnichar(const uint16_t**);
109 // this guy backs up to the previus unichar value, and returns it (*--p)
110 SkUnichar SkUTF16_PrevUnichar(const uint16_t**);
111 size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t utf16[] = NULL);
112
113 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
114 char utf8[] = NULL);
115
SkUnichar_IsVariationSelector(SkUnichar uni)116 inline bool SkUnichar_IsVariationSelector(SkUnichar uni) {
117 /* The 'true' ranges are:
118 * 0x180B <= uni <= 0x180D
119 * 0xFE00 <= uni <= 0xFE0F
120 * 0xE0100 <= uni <= 0xE01EF
121 */
122 if (uni < 0x180B || uni > 0xE01EF) {
123 return false;
124 }
125 if ((uni > 0x180D && uni < 0xFE00) || (uni > 0xFE0F && uni < 0xE0100)) {
126 return false;
127 }
128 return true;
129 }
130
131 ///////////////////////////////////////////////////////////////////////////////
132
133 class SkAutoTrace {
134 public:
135 /** NOTE: label contents are not copied, just the ptr is
136 retained, so DON'T DELETE IT.
137 */
SkAutoTrace(const char label[])138 SkAutoTrace(const char label[]) : fLabel(label) {
139 SkDebugf("--- trace: %s Enter\n", fLabel);
140 }
~SkAutoTrace()141 ~SkAutoTrace() {
142 SkDebugf("--- trace: %s Leave\n", fLabel);
143 }
144 private:
145 const char* fLabel;
146 };
147 #define SkAutoTrace(...) SK_REQUIRE_LOCAL_VAR(SkAutoTrace)
148
149 #endif
150