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 SkTypes_DEFINED
9 #define SkTypes_DEFINED
10
11 /** \file SkTypes.h
12 */
13
14 // Pre-SkUserConfig.h setup.
15
16 // Allows embedders that want to disable macros that take arguments to just
17 // define that symbol to be one of these
18 #define SK_NOTHING_ARG1(arg1)
19 #define SK_NOTHING_ARG2(arg1, arg2)
20 #define SK_NOTHING_ARG3(arg1, arg2, arg3)
21
22 #if !defined(SK_BUILD_FOR_ANDROID) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN) && \
23 !defined(SK_BUILD_FOR_UNIX) && !defined(SK_BUILD_FOR_MAC)
24
25 #ifdef __APPLE__
26 #include "TargetConditionals.h"
27 #endif
28
29 #if defined(_WIN32) || defined(__SYMBIAN32__)
30 #define SK_BUILD_FOR_WIN
31 #elif defined(ANDROID) || defined(__ANDROID__)
32 #define SK_BUILD_FOR_ANDROID
33 #elif defined(linux) || defined(__linux) || defined(__FreeBSD__) || \
34 defined(__OpenBSD__) || defined(__sun) || defined(__NetBSD__) || \
35 defined(__DragonFly__) || defined(__Fuchsia__) || \
36 defined(__GLIBC__) || defined(__GNU__) || defined(__unix__)
37 #define SK_BUILD_FOR_UNIX
38 #elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
39 #define SK_BUILD_FOR_IOS
40 #else
41 #define SK_BUILD_FOR_MAC
42 #endif
43
44 #endif
45
46 #if defined(SK_BUILD_FOR_WIN) && !defined(__clang__)
47 #if !defined(SK_RESTRICT)
48 #define SK_RESTRICT __restrict
49 #endif
50 #if !defined(SK_WARN_UNUSED_RESULT)
51 #define SK_WARN_UNUSED_RESULT
52 #endif
53 #endif
54
55 #if !defined(SK_RESTRICT)
56 #define SK_RESTRICT __restrict__
57 #endif
58
59 #if !defined(SK_WARN_UNUSED_RESULT)
60 #define SK_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
61 #endif
62
63 #if !defined(SK_CPU_BENDIAN) && !defined(SK_CPU_LENDIAN)
64 #if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
65 #define SK_CPU_BENDIAN
66 #elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
67 #define SK_CPU_LENDIAN
68 #elif defined(__sparc) || defined(__sparc__) || \
69 defined(_POWER) || defined(__powerpc__) || \
70 defined(__ppc__) || defined(__hppa) || \
71 defined(__PPC__) || defined(__PPC64__) || \
72 defined(_MIPSEB) || defined(__ARMEB__) || \
73 defined(__s390__) || \
74 (defined(__sh__) && defined(__BIG_ENDIAN__)) || \
75 (defined(__ia64) && defined(__BIG_ENDIAN__))
76 #define SK_CPU_BENDIAN
77 #else
78 #define SK_CPU_LENDIAN
79 #endif
80 #endif
81
82 #if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
83 #define SK_CPU_X86 1
84 #endif
85
86 /**
87 * SK_CPU_SSE_LEVEL
88 *
89 * If defined, SK_CPU_SSE_LEVEL should be set to the highest supported level.
90 * On non-intel CPU this should be undefined.
91 */
92 #define SK_CPU_SSE_LEVEL_SSE1 10
93 #define SK_CPU_SSE_LEVEL_SSE2 20
94 #define SK_CPU_SSE_LEVEL_SSE3 30
95 #define SK_CPU_SSE_LEVEL_SSSE3 31
96 #define SK_CPU_SSE_LEVEL_SSE41 41
97 #define SK_CPU_SSE_LEVEL_SSE42 42
98 #define SK_CPU_SSE_LEVEL_AVX 51
99 #define SK_CPU_SSE_LEVEL_AVX2 52
100 #define SK_CPU_SSE_LEVEL_SKX 60
101
102 // Are we in GCC/Clang?
103 #ifndef SK_CPU_SSE_LEVEL
104 // These checks must be done in descending order to ensure we set the highest
105 // available SSE level.
106 #if defined(__AVX512F__) && defined(__AVX512DQ__) && defined(__AVX512CD__) && \
107 defined(__AVX512BW__) && defined(__AVX512VL__)
108 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SKX
109 #elif defined(__AVX2__)
110 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX2
111 #elif defined(__AVX__)
112 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX
113 #elif defined(__SSE4_2__)
114 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE42
115 #elif defined(__SSE4_1__)
116 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE41
117 #elif defined(__SSSE3__)
118 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSSE3
119 #elif defined(__SSE3__)
120 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE3
121 #elif defined(__SSE2__)
122 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
123 #endif
124 #endif
125
126 // Are we in VisualStudio?
127 #ifndef SK_CPU_SSE_LEVEL
128 // These checks must be done in descending order to ensure we set the highest
129 // available SSE level. 64-bit intel guarantees at least SSE2 support.
130 #if defined(__AVX512F__) && defined(__AVX512DQ__) && defined(__AVX512CD__) && \
131 defined(__AVX512BW__) && defined(__AVX512VL__)
132 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SKX
133 #elif defined(__AVX2__)
134 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX2
135 #elif defined(__AVX__)
136 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_AVX
137 #elif defined(_M_X64) || defined(_M_AMD64)
138 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
139 #elif defined(_M_IX86_FP)
140 #if _M_IX86_FP >= 2
141 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE2
142 #elif _M_IX86_FP == 1
143 #define SK_CPU_SSE_LEVEL SK_CPU_SSE_LEVEL_SSE1
144 #endif
145 #endif
146 #endif
147
148 // ARM defines
149 #if defined(__arm__) && (!defined(__APPLE__) || !TARGET_IPHONE_SIMULATOR)
150 #define SK_CPU_ARM32
151 #elif defined(__aarch64__)
152 #define SK_CPU_ARM64
153 #endif
154
155 // All 64-bit ARM chips have NEON. Many 32-bit ARM chips do too.
156 #if !defined(SK_ARM_HAS_NEON) && defined(__ARM_NEON)
157 #define SK_ARM_HAS_NEON
158 #endif
159
160 #if defined(__ARM_FEATURE_CRC32)
161 #define SK_ARM_HAS_CRC32
162 #endif
163
164
165 // DLL/.so exports.
166 #if !defined(SKIA_IMPLEMENTATION)
167 #define SKIA_IMPLEMENTATION 0
168 #endif
169 #if !defined(SK_API)
170 #if defined(SKIA_DLL)
171 #if defined(_MSC_VER)
172 #if SKIA_IMPLEMENTATION
173 #define SK_API __declspec(dllexport)
174 #else
175 #define SK_API __declspec(dllimport)
176 #endif
177 #else
178 #define SK_API __attribute__((visibility("default")))
179 #endif
180 #else
181 #define SK_API
182 #endif
183 #endif
184
185 // SK_SPI is functionally identical to SK_API, but used within src to clarify that it's less stable
186 #if !defined(SK_SPI)
187 #define SK_SPI SK_API
188 #endif
189
190 // IWYU pragma: begin_exports
191 #if defined (SK_USER_CONFIG_HEADER)
192 #include SK_USER_CONFIG_HEADER
193 #else
194 #include "include/config/SkUserConfig.h"
195 #endif
196 #include <stddef.h>
197 #include <stdint.h>
198 // IWYU pragma: end_exports
199
200 // Post SkUserConfig.h checks and such.
201 #if !defined(SK_DEBUG) && !defined(SK_RELEASE)
202 #ifdef NDEBUG
203 #define SK_RELEASE
204 #else
205 #define SK_DEBUG
206 #endif
207 #endif
208
209 #if defined(SK_DEBUG) && defined(SK_RELEASE)
210 # error "cannot define both SK_DEBUG and SK_RELEASE"
211 #elif !defined(SK_DEBUG) && !defined(SK_RELEASE)
212 # error "must define either SK_DEBUG or SK_RELEASE"
213 #endif
214
215 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN)
216 # error "cannot define both SK_CPU_LENDIAN and SK_CPU_BENDIAN"
217 #elif !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN)
218 # error "must define either SK_CPU_LENDIAN or SK_CPU_BENDIAN"
219 #endif
220
221 #if defined(SK_CPU_BENDIAN) && !defined(I_ACKNOWLEDGE_SKIA_DOES_NOT_SUPPORT_BIG_ENDIAN)
222 #error "The Skia team is not endian-savvy enough to support big-endian CPUs."
223 #error "If you still want to use Skia,"
224 #error "please define I_ACKNOWLEDGE_SKIA_DOES_NOT_SUPPORT_BIG_ENDIAN."
225 #endif
226
227 #if !defined(SK_ATTRIBUTE)
228 # if defined(__clang__) || defined(__GNUC__)
229 # define SK_ATTRIBUTE(attr) __attribute__((attr))
230 # else
231 # define SK_ATTRIBUTE(attr)
232 # endif
233 #endif
234
235 #if !defined(SK_SUPPORT_GPU)
236 # define SK_SUPPORT_GPU 1
237 #endif
238
239 #if !SK_SUPPORT_GPU
240 # undef SK_GL
241 # undef SK_VULKAN
242 # undef SK_METAL
243 # undef SK_DAWN
244 # undef SK_DIRECT3D
245 #endif
246
247 #if !defined(SkUNREACHABLE)
248 # if defined(_MSC_VER) && !defined(__clang__)
249 # include <intrin.h>
250 # define FAST_FAIL_INVALID_ARG 5
251 // See https://developercommunity.visualstudio.com/content/problem/1128631/code-flow-doesnt-see-noreturn-with-extern-c.html
252 // for why this is wrapped. Hopefully removable after msvc++ 19.27 is no longer supported.
sk_fast_fail()253 [[noreturn]] static inline void sk_fast_fail() { __fastfail(FAST_FAIL_INVALID_ARG); }
254 # define SkUNREACHABLE sk_fast_fail()
255 # else
256 # define SkUNREACHABLE __builtin_trap()
257 # endif
258 #endif
259
260 #if defined(SK_BUILD_FOR_GOOGLE3)
261 void SkDebugfForDumpStackTrace(const char* data, void* unused);
262 void DumpStackTrace(int skip_count, void w(const char*, void*), void* arg);
263 # define SK_DUMP_GOOGLE3_STACK() DumpStackTrace(0, SkDebugfForDumpStackTrace, nullptr)
264 #else
265 # define SK_DUMP_GOOGLE3_STACK()
266 #endif
267
268 #ifndef SK_ABORT
269 # ifdef SK_BUILD_FOR_WIN
270 // This style lets Visual Studio follow errors back to the source file.
271 # define SK_DUMP_LINE_FORMAT "%s(%d)"
272 # else
273 # define SK_DUMP_LINE_FORMAT "%s:%d"
274 # endif
275 # define SK_ABORT(message, ...) \
276 do { \
277 SkDebugf(SK_DUMP_LINE_FORMAT ": fatal error: \"" message "\"\n", \
278 __FILE__, __LINE__, ##__VA_ARGS__); \
279 SK_DUMP_GOOGLE3_STACK(); \
280 sk_abort_no_print(); \
281 } while (false)
282 #endif
283
284 // If SK_R32_SHIFT is set, we'll use that to choose RGBA or BGRA.
285 // If not, we'll default to RGBA everywhere except BGRA on Windows.
286 #if defined(SK_R32_SHIFT)
287 static_assert(SK_R32_SHIFT == 0 || SK_R32_SHIFT == 16, "");
288 #elif defined(SK_BUILD_FOR_WIN)
289 #define SK_R32_SHIFT 16
290 #else
291 #define SK_R32_SHIFT 0
292 #endif
293
294 #if defined(SK_B32_SHIFT)
295 static_assert(SK_B32_SHIFT == (16-SK_R32_SHIFT), "");
296 #else
297 #define SK_B32_SHIFT (16-SK_R32_SHIFT)
298 #endif
299
300 #define SK_G32_SHIFT 8
301 #define SK_A32_SHIFT 24
302
303
304 /**
305 * SK_PMCOLOR_BYTE_ORDER can be used to query the byte order of SkPMColor at compile time.
306 */
307 #ifdef SK_CPU_BENDIAN
308 # define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3) \
309 (SK_ ## C3 ## 32_SHIFT == 0 && \
310 SK_ ## C2 ## 32_SHIFT == 8 && \
311 SK_ ## C1 ## 32_SHIFT == 16 && \
312 SK_ ## C0 ## 32_SHIFT == 24)
313 #else
314 # define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3) \
315 (SK_ ## C0 ## 32_SHIFT == 0 && \
316 SK_ ## C1 ## 32_SHIFT == 8 && \
317 SK_ ## C2 ## 32_SHIFT == 16 && \
318 SK_ ## C3 ## 32_SHIFT == 24)
319 #endif
320
321 #if defined SK_DEBUG && defined SK_BUILD_FOR_WIN
322 #ifdef free
323 #undef free
324 #endif
325 #include <crtdbg.h>
326 #undef free
327 #endif
328
329 #if !defined(SK_UNUSED)
330 # if !defined(__clang__) && defined(_MSC_VER)
331 # define SK_UNUSED __pragma(warning(suppress:4189))
332 # else
333 # define SK_UNUSED SK_ATTRIBUTE(unused)
334 # endif
335 #endif
336
337 #if !defined(SK_MAYBE_UNUSED)
338 # if defined(__clang__) || defined(__GNUC__)
339 # define SK_MAYBE_UNUSED [[maybe_unused]]
340 # else
341 # define SK_MAYBE_UNUSED
342 # endif
343 #endif
344
345 /**
346 * If your judgment is better than the compiler's (i.e. you've profiled it),
347 * you can use SK_ALWAYS_INLINE to force inlining. E.g.
348 * inline void someMethod() { ... } // may not be inlined
349 * SK_ALWAYS_INLINE void someMethod() { ... } // should always be inlined
350 */
351 #if !defined(SK_ALWAYS_INLINE)
352 # if defined(SK_BUILD_FOR_WIN)
353 # define SK_ALWAYS_INLINE __forceinline
354 # else
355 # define SK_ALWAYS_INLINE SK_ATTRIBUTE(always_inline) inline
356 # endif
357 #endif
358
359 /**
360 * If your judgment is better than the compiler's (i.e. you've profiled it),
361 * you can use SK_NEVER_INLINE to prevent inlining.
362 */
363 #if !defined(SK_NEVER_INLINE)
364 # if defined(SK_BUILD_FOR_WIN)
365 # define SK_NEVER_INLINE __declspec(noinline)
366 # else
367 # define SK_NEVER_INLINE SK_ATTRIBUTE(noinline)
368 # endif
369 #endif
370
371 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE1
372 #define SK_PREFETCH(ptr) _mm_prefetch(reinterpret_cast<const char*>(ptr), _MM_HINT_T0)
373 #elif defined(__GNUC__)
374 #define SK_PREFETCH(ptr) __builtin_prefetch(ptr)
375 #else
376 #define SK_PREFETCH(ptr)
377 #endif
378
379 #ifndef SK_PRINTF_LIKE
380 # if defined(__clang__) || defined(__GNUC__)
381 # define SK_PRINTF_LIKE(A, B) __attribute__((format(printf, (A), (B))))
382 # else
383 # define SK_PRINTF_LIKE(A, B)
384 # endif
385 #endif
386
387 #ifndef SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
388 #define SK_ALLOW_STATIC_GLOBAL_INITIALIZERS 0
389 #endif
390
391 #if !defined(SK_GAMMA_EXPONENT)
392 #define SK_GAMMA_EXPONENT (0.0f) // SRGB
393 #endif
394
395 #ifndef GR_TEST_UTILS
396 # define GR_TEST_UTILS 0
397 #endif
398
399 #if defined(SK_HISTOGRAM_ENUMERATION) || \
400 defined(SK_HISTOGRAM_BOOLEAN) || \
401 defined(SK_HISTOGRAM_EXACT_LINEAR) || \
402 defined(SK_HISTOGRAM_MEMORY_KB)
403 # define SK_HISTOGRAMS_ENABLED 1
404 #else
405 # define SK_HISTOGRAMS_ENABLED 0
406 #endif
407
408 #ifndef SK_HISTOGRAM_BOOLEAN
409 # define SK_HISTOGRAM_BOOLEAN(name, sample)
410 #endif
411
412 #ifndef SK_HISTOGRAM_ENUMERATION
413 # define SK_HISTOGRAM_ENUMERATION(name, sample, enum_size)
414 #endif
415
416 #ifndef SK_HISTOGRAM_EXACT_LINEAR
417 # define SK_HISTOGRAM_EXACT_LINEAR(name, sample, value_max)
418 #endif
419
420 #ifndef SK_HISTOGRAM_MEMORY_KB
421 # define SK_HISTOGRAM_MEMORY_KB(name, sample)
422 #endif
423
424 #define SK_HISTOGRAM_PERCENTAGE(name, percent_as_int) \
425 SK_HISTOGRAM_EXACT_LINEAR(name, percent_as_int, 101)
426
427 #ifndef SK_DISABLE_LEGACY_SHADERCONTEXT
428 #define SK_ENABLE_LEGACY_SHADERCONTEXT
429 #endif
430
431 #ifdef SK_ENABLE_API_AVAILABLE
432 #define SK_API_AVAILABLE API_AVAILABLE
433 #else
434 #define SK_API_AVAILABLE(...)
435 #endif
436
437 #if defined(SK_BUILD_FOR_LIBFUZZER) || defined(SK_BUILD_FOR_AFL_FUZZ)
438 #define SK_BUILD_FOR_FUZZER
439 #endif
440
441 /** Called internally if we hit an unrecoverable error.
442 The platform implementation must not return, but should either throw
443 an exception or otherwise exit.
444 */
445 [[noreturn]] SK_API extern void sk_abort_no_print(void);
446
447 #ifndef SkDebugf
448 SK_API void SkDebugf(const char format[], ...);
449 #endif
450 #if defined(SK_BUILD_FOR_LIBFUZZER)
SkDebugf(const char format[],...)451 SK_API inline void SkDebugf(const char format[], ...) {}
452 #endif
453
454 // SkASSERT, SkASSERTF and SkASSERT_RELEASE can be used as stand alone assertion expressions, e.g.
455 // uint32_t foo(int x) {
456 // SkASSERT(x > 4);
457 // return x - 4;
458 // }
459 // and are also written to be compatible with constexpr functions:
460 // constexpr uint32_t foo(int x) {
461 // return SkASSERT(x > 4),
462 // x - 4;
463 // }
464 #define SkASSERT_RELEASE(cond) \
465 static_cast<void>( (cond) ? (void)0 : []{ SK_ABORT("assert(%s)", #cond); }() )
466
467 #ifdef SK_DEBUG
468 #define SkASSERT(cond) SkASSERT_RELEASE(cond)
469 #define SkASSERTF(cond, fmt, ...) static_cast<void>( (cond) ? (void)0 : [&]{ \
470 SkDebugf(fmt"\n", ##__VA_ARGS__); \
471 SK_ABORT("assert(%s)", #cond); \
472 }() )
473 #define SkDEBUGFAIL(message) SK_ABORT("%s", message)
474 #define SkDEBUGFAILF(fmt, ...) SK_ABORT(fmt, ##__VA_ARGS__)
475 #define SkDEBUGCODE(...) __VA_ARGS__
476 #define SkDEBUGF(...) SkDebugf(__VA_ARGS__)
477 #define SkAssertResult(cond) SkASSERT(cond)
478 #else
479 #define SkASSERT(cond) static_cast<void>(0)
480 #define SkASSERTF(cond, fmt, ...) static_cast<void>(0)
481 #define SkDEBUGFAIL(message)
482 #define SkDEBUGFAILF(fmt, ...)
483 #define SkDEBUGCODE(...)
484 #define SkDEBUGF(...)
485
486 // unlike SkASSERT, this macro executes its condition in the non-debug build.
487 // The if is present so that this can be used with functions marked SK_WARN_UNUSED_RESULT.
488 #define SkAssertResult(cond) if (cond) {} do {} while(false)
489 #endif
490
491 ////////////////////////////////////////////////////////////////////////////////
492
493 /** Fast type for unsigned 8 bits. Use for parameter passing and local
494 variables, not for storage
495 */
496 typedef unsigned U8CPU;
497
498 /** Fast type for unsigned 16 bits. Use for parameter passing and local
499 variables, not for storage
500 */
501 typedef unsigned U16CPU;
502
503 /** @return false or true based on the condition
504 */
SkToBool(const T & x)505 template <typename T> static constexpr bool SkToBool(const T& x) {
506 return 0 != x; // NOLINT(modernize-use-nullptr)
507 }
508
509 static constexpr int16_t SK_MaxS16 = INT16_MAX;
510 static constexpr int16_t SK_MinS16 = -SK_MaxS16;
511
512 static constexpr int32_t SK_MaxS32 = INT32_MAX;
513 static constexpr int32_t SK_MinS32 = -SK_MaxS32;
514 static constexpr int32_t SK_NaN32 = INT32_MIN;
515
516 static constexpr int64_t SK_MaxS64 = INT64_MAX;
517 static constexpr int64_t SK_MinS64 = -SK_MaxS64;
518
SkLeftShift(int32_t value,int32_t shift)519 static inline constexpr int32_t SkLeftShift(int32_t value, int32_t shift) {
520 return (int32_t) ((uint32_t) value << shift);
521 }
522
SkLeftShift(int64_t value,int32_t shift)523 static inline constexpr int64_t SkLeftShift(int64_t value, int32_t shift) {
524 return (int64_t) ((uint64_t) value << shift);
525 }
526
527 ////////////////////////////////////////////////////////////////////////////////
528
529 /** @return the number of entries in an array (not a pointer)
530 */
531 template <typename T, size_t N> char (&SkArrayCountHelper(T (&array)[N]))[N];
532 #define SK_ARRAY_COUNT(array) (sizeof(SkArrayCountHelper(array)))
533
534 ////////////////////////////////////////////////////////////////////////////////
535
SkAlign2(T x)536 template <typename T> static constexpr T SkAlign2(T x) { return (x + 1) >> 1 << 1; }
SkAlign4(T x)537 template <typename T> static constexpr T SkAlign4(T x) { return (x + 3) >> 2 << 2; }
SkAlign8(T x)538 template <typename T> static constexpr T SkAlign8(T x) { return (x + 7) >> 3 << 3; }
539
SkIsAlign2(T x)540 template <typename T> static constexpr bool SkIsAlign2(T x) { return 0 == (x & 1); }
SkIsAlign4(T x)541 template <typename T> static constexpr bool SkIsAlign4(T x) { return 0 == (x & 3); }
SkIsAlign8(T x)542 template <typename T> static constexpr bool SkIsAlign8(T x) { return 0 == (x & 7); }
543
SkAlignPtr(T x)544 template <typename T> static constexpr T SkAlignPtr(T x) {
545 return sizeof(void*) == 8 ? SkAlign8(x) : SkAlign4(x);
546 }
SkIsAlignPtr(T x)547 template <typename T> static constexpr bool SkIsAlignPtr(T x) {
548 return sizeof(void*) == 8 ? SkIsAlign8(x) : SkIsAlign4(x);
549 }
550
551 typedef uint32_t SkFourByteTag;
SkSetFourByteTag(char a,char b,char c,char d)552 static inline constexpr SkFourByteTag SkSetFourByteTag(char a, char b, char c, char d) {
553 return (((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d);
554 }
555
556 ////////////////////////////////////////////////////////////////////////////////
557
558 /** 32 bit integer to hold a unicode value
559 */
560 typedef int32_t SkUnichar;
561
562 /** 16 bit unsigned integer to hold a glyph index
563 */
564 typedef uint16_t SkGlyphID;
565
566 /** 32 bit value to hold a millisecond duration
567 Note that SK_MSecMax is about 25 days.
568 */
569 typedef uint32_t SkMSec;
570
571 /** Maximum representable milliseconds; 24d 20h 31m 23.647s.
572 */
573 static constexpr SkMSec SK_MSecMax = INT32_MAX;
574
575 /** The generation IDs in Skia reserve 0 has an invalid marker.
576 */
577 static constexpr uint32_t SK_InvalidGenID = 0;
578
579 /** The unique IDs in Skia reserve 0 has an invalid marker.
580 */
581 static constexpr uint32_t SK_InvalidUniqueID = 0;
582
SkAbs32(int32_t value)583 static inline int32_t SkAbs32(int32_t value) {
584 SkASSERT(value != SK_NaN32); // The most negative int32_t can't be negated.
585 if (value < 0) {
586 value = -value;
587 }
588 return value;
589 }
590
SkTAbs(T value)591 template <typename T> static inline T SkTAbs(T value) {
592 if (value < 0) {
593 value = -value;
594 }
595 return value;
596 }
597
598 ////////////////////////////////////////////////////////////////////////////////
599
600 /** Indicates whether an allocation should count against a cache budget.
601 */
602 enum class SkBudgeted : bool {
603 kNo = false,
604 kYes = true
605 };
606
607 /** Indicates whether a backing store needs to be an exact match or can be
608 larger than is strictly necessary
609 */
610 enum class SkBackingFit {
611 kApprox,
612 kExact
613 };
614
615 #endif
616