1 /* libs/graphics/sgl/SkUtils.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include "SkUtils.h"
19
20 #if 0
21 #define assign_16_longs(dst, value) \
22 do { \
23 (dst)[0] = value; (dst)[1] = value; \
24 (dst)[2] = value; (dst)[3] = value; \
25 (dst)[4] = value; (dst)[5] = value; \
26 (dst)[6] = value; (dst)[7] = value; \
27 (dst)[8] = value; (dst)[9] = value; \
28 (dst)[10] = value; (dst)[11] = value; \
29 (dst)[12] = value; (dst)[13] = value; \
30 (dst)[14] = value; (dst)[15] = value; \
31 } while (0)
32 #else
33 #define assign_16_longs(dst, value) \
34 do { \
35 *(dst)++ = value; *(dst)++ = value; \
36 *(dst)++ = value; *(dst)++ = value; \
37 *(dst)++ = value; *(dst)++ = value; \
38 *(dst)++ = value; *(dst)++ = value; \
39 *(dst)++ = value; *(dst)++ = value; \
40 *(dst)++ = value; *(dst)++ = value; \
41 *(dst)++ = value; *(dst)++ = value; \
42 *(dst)++ = value; *(dst)++ = value; \
43 } while (0)
44 #endif
45
46 ///////////////////////////////////////////////////////////////////////////
47
sk_memset16_portable(uint16_t dst[],uint16_t value,int count)48 void sk_memset16_portable(uint16_t dst[], uint16_t value, int count)
49 {
50 SkASSERT(dst != NULL && count >= 0);
51
52 if (count <= 0)
53 return;
54
55 // not sure if this helps to short-circuit on small values of count
56 if (count < 8)
57 {
58 do {
59 *dst++ = (uint16_t)value;
60 } while (--count != 0);
61 return;
62 }
63
64 // ensure we're on a long boundary
65 if ((size_t)dst & 2)
66 {
67 *dst++ = (uint16_t)value;
68 count -= 1;
69 }
70
71 uint32_t value32 = ((uint32_t)value << 16) | value;
72
73 // handle the bulk with our unrolled macro
74 {
75 int sixteenlongs = count >> 5;
76 if (sixteenlongs)
77 {
78 uint32_t* dst32 = (uint32_t*)dst;
79 do {
80 assign_16_longs(dst32, value32);
81 } while (--sixteenlongs != 0);
82 dst = (uint16_t*)dst32;
83 count &= 31;
84 }
85 }
86
87 // handle (most) of the rest
88 {
89 int longs = count >> 1;
90 if (longs)
91 {
92 do {
93 *(uint32_t*)dst = value32;
94 dst += 2;
95 } while (--longs != 0);
96 }
97 }
98
99 // cleanup a possible trailing short
100 if (count & 1)
101 *dst = (uint16_t)value;
102 }
103
sk_memset32_portable(uint32_t dst[],uint32_t value,int count)104 void sk_memset32_portable(uint32_t dst[], uint32_t value, int count)
105 {
106 SkASSERT(dst != NULL && count >= 0);
107
108 {
109 int sixteenlongs = count >> 4;
110 if (sixteenlongs)
111 {
112 do {
113 assign_16_longs(dst, value);
114 } while (--sixteenlongs != 0);
115 count &= 15;
116 }
117 }
118
119 if (count)
120 {
121 do {
122 *dst++ = value;
123 } while (--count != 0);
124 }
125 }
126
127 //////////////////////////////////////////////////////////////////////////////
128
129 /* 0xxxxxxx 1 total
130 10xxxxxx // never a leading byte
131 110xxxxx 2 total
132 1110xxxx 3 total
133 11110xxx 4 total
134
135 11 10 01 01 xx xx xx xx 0...
136 0xE5XX0000
137 0xE5 << 24
138 */
139
140 #ifdef SK_DEBUG
assert_utf8_leadingbyte(unsigned c)141 static void assert_utf8_leadingbyte(unsigned c)
142 {
143 SkASSERT(c <= 0xF7); // otherwise leading byte is too big (more than 4 bytes)
144 SkASSERT((c & 0xC0) != 0x80); // can't begin with a middle char
145 }
146
SkUTF8_LeadByteToCount(unsigned c)147 int SkUTF8_LeadByteToCount(unsigned c)
148 {
149 assert_utf8_leadingbyte(c);
150 return (((0xE5 << 24) >> (c >> 4 << 1)) & 3) + 1;
151 }
152 #else
153 #define assert_utf8_leadingbyte(c)
154 #endif
155
SkUTF8_CountUnichars(const char utf8[])156 int SkUTF8_CountUnichars(const char utf8[])
157 {
158 SkASSERT(utf8);
159
160 int count = 0;
161
162 for (;;)
163 {
164 int c = *(const uint8_t*)utf8;
165 if (c == 0)
166 break;
167
168 utf8 += SkUTF8_LeadByteToCount(c);
169 count += 1;
170 }
171 return count;
172 }
173
SkUTF8_CountUnichars(const char utf8[],size_t byteLength)174 int SkUTF8_CountUnichars(const char utf8[], size_t byteLength)
175 {
176 SkASSERT(NULL != utf8 || 0 == byteLength);
177
178 int count = 0;
179 const char* stop = utf8 + byteLength;
180
181 while (utf8 < stop)
182 {
183 utf8 += SkUTF8_LeadByteToCount(*(const uint8_t*)utf8);
184 count += 1;
185 }
186 return count;
187 }
188
SkUTF8_ToUnichar(const char utf8[])189 SkUnichar SkUTF8_ToUnichar(const char utf8[])
190 {
191 SkASSERT(NULL != utf8);
192
193 const uint8_t* p = (const uint8_t*)utf8;
194 int c = *p;
195 int hic = c << 24;
196
197 assert_utf8_leadingbyte(c);
198
199 if (hic < 0)
200 {
201 uint32_t mask = (uint32_t)~0x3F;
202 hic <<= 1;
203 do {
204 c = (c << 6) | (*++p & 0x3F);
205 mask <<= 5;
206 } while ((hic <<= 1) < 0);
207 c &= ~mask;
208 }
209 return c;
210 }
211
SkUTF8_NextUnichar(const char ** ptr)212 SkUnichar SkUTF8_NextUnichar(const char** ptr)
213 {
214 SkASSERT(NULL != ptr && NULL != *ptr);
215
216 const uint8_t* p = (const uint8_t*)*ptr;
217 int c = *p;
218 int hic = c << 24;
219
220 assert_utf8_leadingbyte(c);
221
222 if (hic < 0)
223 {
224 uint32_t mask = (uint32_t)~0x3F;
225 hic <<= 1;
226 do {
227 c = (c << 6) | (*++p & 0x3F);
228 mask <<= 5;
229 } while ((hic <<= 1) < 0);
230 c &= ~mask;
231 }
232 *ptr = (char*)p + 1;
233 return c;
234 }
235
SkUTF8_PrevUnichar(const char ** ptr)236 SkUnichar SkUTF8_PrevUnichar(const char** ptr)
237 {
238 SkASSERT(NULL != ptr && NULL != *ptr);
239
240 const char* p = *ptr;
241
242 if (*--p & 0x80)
243 while (*--p & 0x40)
244 ;
245
246 *ptr = (char*)p;
247 return SkUTF8_NextUnichar(&p);
248 }
249
SkUTF8_FromUnichar(SkUnichar uni,char utf8[])250 size_t SkUTF8_FromUnichar(SkUnichar uni, char utf8[])
251 {
252 if ((uint32_t)uni > 0x10FFFF)
253 {
254 SkASSERT(!"bad unichar");
255 return 0;
256 }
257
258 if (uni <= 127)
259 {
260 if (utf8)
261 *utf8 = (char)uni;
262 return 1;
263 }
264
265 char tmp[4];
266 char* p = tmp;
267 size_t count = 1;
268
269 SkDEBUGCODE(SkUnichar orig = uni;)
270
271 while (uni > 0x7F >> count)
272 {
273 *p++ = (char)(0x80 | (uni & 0x3F));
274 uni >>= 6;
275 count += 1;
276 }
277
278 if (utf8)
279 {
280 p = tmp;
281 utf8 += count;
282 while (p < tmp + count - 1)
283 *--utf8 = *p++;
284 *--utf8 = (char)(~(0xFF >> count) | uni);
285 }
286
287 SkASSERT(utf8 == NULL || orig == SkUTF8_ToUnichar(utf8));
288 return count;
289 }
290
291 ////////////////////////////////////////////////////////////////////////////////////
292
SkUTF16_CountUnichars(const uint16_t src[])293 int SkUTF16_CountUnichars(const uint16_t src[])
294 {
295 SkASSERT(src);
296
297 int count = 0;
298 unsigned c;
299 while ((c = *src++) != 0)
300 {
301 SkASSERT(!SkUTF16_IsLowSurrogate(c));
302 if (SkUTF16_IsHighSurrogate(c))
303 {
304 c = *src++;
305 SkASSERT(SkUTF16_IsLowSurrogate(c));
306 }
307 count += 1;
308 }
309 return count;
310 }
311
SkUTF16_CountUnichars(const uint16_t src[],int numberOf16BitValues)312 int SkUTF16_CountUnichars(const uint16_t src[], int numberOf16BitValues)
313 {
314 SkASSERT(src);
315
316 const uint16_t* stop = src + numberOf16BitValues;
317 int count = 0;
318 while (src < stop)
319 {
320 unsigned c = *src++;
321 SkASSERT(!SkUTF16_IsLowSurrogate(c));
322 if (SkUTF16_IsHighSurrogate(c))
323 {
324 SkASSERT(src < stop);
325 c = *src++;
326 SkASSERT(SkUTF16_IsLowSurrogate(c));
327 }
328 count += 1;
329 }
330 return count;
331 }
332
SkUTF16_NextUnichar(const uint16_t ** srcPtr)333 SkUnichar SkUTF16_NextUnichar(const uint16_t** srcPtr)
334 {
335 SkASSERT(srcPtr && *srcPtr);
336
337 const uint16_t* src = *srcPtr;
338 SkUnichar c = *src++;
339
340 SkASSERT(!SkUTF16_IsLowSurrogate(c));
341 if (SkUTF16_IsHighSurrogate(c))
342 {
343 unsigned c2 = *src++;
344 SkASSERT(SkUTF16_IsLowSurrogate(c2));
345
346 // c = ((c & 0x3FF) << 10) + (c2 & 0x3FF) + 0x10000
347 // c = (((c & 0x3FF) + 64) << 10) + (c2 & 0x3FF)
348 c = (c << 10) + c2 + (0x10000 - (0xD800 << 10) - 0xDC00);
349 }
350 *srcPtr = src;
351 return c;
352 }
353
SkUTF16_PrevUnichar(const uint16_t ** srcPtr)354 SkUnichar SkUTF16_PrevUnichar(const uint16_t** srcPtr)
355 {
356 SkASSERT(srcPtr && *srcPtr);
357
358 const uint16_t* src = *srcPtr;
359 SkUnichar c = *--src;
360
361 SkASSERT(!SkUTF16_IsHighSurrogate(c));
362 if (SkUTF16_IsLowSurrogate(c))
363 {
364 unsigned c2 = *--src;
365 SkASSERT(SkUTF16_IsHighSurrogate(c2));
366 c = (c2 << 10) + c + (0x10000 - (0xD800 << 10) - 0xDC00);
367 }
368 *srcPtr = src;
369 return c;
370 }
371
SkUTF16_FromUnichar(SkUnichar uni,uint16_t dst[])372 size_t SkUTF16_FromUnichar(SkUnichar uni, uint16_t dst[])
373 {
374 SkASSERT((unsigned)uni <= 0x10FFFF);
375
376 int extra = (uni > 0xFFFF);
377
378 if (dst)
379 {
380 if (extra)
381 {
382 // dst[0] = SkToU16(0xD800 | ((uni - 0x10000) >> 10));
383 // dst[0] = SkToU16(0xD800 | ((uni >> 10) - 64));
384 dst[0] = SkToU16((0xD800 - 64) + (uni >> 10));
385 dst[1] = SkToU16(0xDC00 | (uni & 0x3FF));
386
387 SkASSERT(SkUTF16_IsHighSurrogate(dst[0]));
388 SkASSERT(SkUTF16_IsLowSurrogate(dst[1]));
389 }
390 else
391 {
392 dst[0] = SkToU16(uni);
393 SkASSERT(!SkUTF16_IsHighSurrogate(dst[0]));
394 SkASSERT(!SkUTF16_IsLowSurrogate(dst[0]));
395 }
396 }
397 return 1 + extra;
398 }
399
SkUTF16_ToUTF8(const uint16_t utf16[],int numberOf16BitValues,char utf8[])400 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues, char utf8[])
401 {
402 SkASSERT(numberOf16BitValues >= 0);
403 if (numberOf16BitValues <= 0)
404 return 0;
405
406 SkASSERT(utf16 != NULL);
407
408 const uint16_t* stop = utf16 + numberOf16BitValues;
409 size_t size = 0;
410
411 if (utf8 == NULL) // just count
412 {
413 while (utf16 < stop)
414 size += SkUTF8_FromUnichar(SkUTF16_NextUnichar(&utf16), NULL);
415 }
416 else
417 {
418 char* start = utf8;
419 while (utf16 < stop)
420 utf8 += SkUTF8_FromUnichar(SkUTF16_NextUnichar(&utf16), utf8);
421 size = utf8 - start;
422 }
423 return size;
424 }
425
426 ////////////////////////////////////////////////////////////////////////////////////
427
428 #include <stdlib.h>
429
430 #if 0
431 static int round_to_K(size_t bytes)
432 {
433 return (bytes + 512) >> 10;
434 }
435 #endif
436
SkAutoMemoryUsageProbe(const char label[])437 SkAutoMemoryUsageProbe::SkAutoMemoryUsageProbe(const char label[])
438 : fLabel(label)
439 {
440 #if 0
441 struct mallinfo mi = mallinfo();
442
443 fBytesAllocated = mi.uordblks;
444 #endif
445 }
446
~SkAutoMemoryUsageProbe()447 SkAutoMemoryUsageProbe::~SkAutoMemoryUsageProbe()
448 {
449 #if 0
450 struct mallinfo mi = mallinfo();
451
452 printf("SkAutoMemoryUsageProbe ");
453 if (fLabel)
454 printf("<%s> ", fLabel);
455 printf("delta %dK, current total allocated %dK\n",
456 round_to_K(mi.uordblks - fBytesAllocated),
457 round_to_K(mi.uordblks));
458 #endif
459 }
460
461