2 * Copyright 2006 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkTypes_DEFINED
9 #define SkTypes_DEFINED
11 #include "SkPreConfig.h"
12 #include "SkUserConfig.h"
13 #include "SkPostConfig.h"
19 /** See SkGraphics::GetVersion() to retrieve these at runtime
21 #define SKIA_VERSION_MAJOR 1
22 #define SKIA_VERSION_MINOR 0
23 #define SKIA_VERSION_PATCH 0
26 memory wrappers to be implemented by the porting layer (platform)
29 /** Called internally if we run out of memory. The platform implementation must
30 not return, but should either throw an exception or otherwise exit.
32 SK_API extern void sk_out_of_memory(void);
33 /** Called internally if we hit an unrecoverable error.
34 The platform implementation must not return, but should either throw
35 an exception or otherwise exit.
37 SK_API extern void sk_throw(void);
40 SK_MALLOC_TEMP = 0x01, //!< hint to sk_malloc that the requested memory will be freed in the scope of the stack frame
41 SK_MALLOC_THROW = 0x02 //!< instructs sk_malloc to call sk_throw if the memory cannot be allocated.
43 /** Return a block of memory (at least 4-byte aligned) of at least the
44 specified size. If the requested memory cannot be returned, either
45 return null (if SK_MALLOC_TEMP bit is clear) or throw an exception
46 (if SK_MALLOC_TEMP bit is set). To free the memory, call sk_free().
48 SK_API extern void* sk_malloc_flags(size_t size, unsigned flags);
49 /** Same as sk_malloc(), but hard coded to pass SK_MALLOC_THROW as the flag
51 SK_API extern void* sk_malloc_throw(size_t size);
52 /** Same as standard realloc(), but this one never returns null on failure. It will throw
53 an exception if it fails.
55 SK_API extern void* sk_realloc_throw(void* buffer, size_t size);
56 /** Free memory returned by sk_malloc(). It is safe to pass null.
58 SK_API extern void sk_free(void*);
60 /** Much like calloc: returns a pointer to at least size zero bytes, or NULL on failure.
62 SK_API extern void* sk_calloc(size_t size);
64 /** Same as sk_calloc, but throws an exception instead of returning NULL on failure.
66 SK_API extern void* sk_calloc_throw(size_t size);
68 // bzero is safer than memset, but we can't rely on it, so... sk_bzero()
69 static inline void sk_bzero(void* buffer, size_t size) {
70 memset(buffer, 0, size);
73 ///////////////////////////////////////////////////////////////////////////////
75 #ifdef SK_OVERRIDE_GLOBAL_NEW
78 inline void* operator new(size_t size) {
79 return sk_malloc_throw(size);
82 inline void operator delete(void* p) {
87 ///////////////////////////////////////////////////////////////////////////////
89 #define SK_INIT_TO_AVOID_WARNING = 0
92 void SkDebugf(const char format[], ...);
96 #define SkASSERT(cond) SK_DEBUGBREAK(cond)
97 #define SkDEBUGFAIL(message) SkASSERT(false && message)
98 #define SkDEBUGCODE(code) code
99 #define SkDECLAREPARAM(type, var) , type var
100 #define SkPARAM(var) , var
101 // #define SkDEBUGF(args ) SkDebugf##args
102 #define SkDEBUGF(args ) SkDebugf args
103 #define SkAssertResult(cond) SkASSERT(cond)
105 #define SkASSERT(cond)
106 #define SkDEBUGFAIL(message)
107 #define SkDEBUGCODE(code)
108 #define SkDEBUGF(args)
109 #define SkDECLAREPARAM(type, var)
112 // unlike SkASSERT, this guy executes its condition in the non-debug build
113 #define SkAssertResult(cond) cond
117 #define SkDEVCODE(code) code
118 // the 'toString' helper functions convert Sk* objects to human-readable
119 // form in developer mode
120 #define SK_DEVELOPER_TO_STRING() virtual void toString(SkString* str) const SK_OVERRIDE;
122 #define SkDEVCODE(code)
123 #define SK_DEVELOPER_TO_STRING()
127 struct SkCompileAssert {
130 #define SK_COMPILE_ASSERT(expr, msg) \
131 typedef SkCompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1] SK_UNUSED
134 * Usage: SK_MACRO_CONCAT(a, b) to construct the symbol ab
136 * SK_MACRO_CONCAT_IMPL_PRIV just exists to make this work. Do not use directly
139 #define SK_MACRO_CONCAT(X, Y) SK_MACRO_CONCAT_IMPL_PRIV(X, Y)
140 #define SK_MACRO_CONCAT_IMPL_PRIV(X, Y) X ## Y
143 * Usage: SK_MACRO_APPEND_LINE(foo) to make foo123, where 123 is the current
144 * line number. Easy way to construct
145 * unique names for local functions or
148 #define SK_MACRO_APPEND_LINE(name) SK_MACRO_CONCAT(name, __LINE__)
151 * For some classes, it's almost always an error to instantiate one without a name, e.g.
153 * SkAutoMutexAcquire(&mutex);
156 * In this case, the writer meant to hold mutex while the rest of the code in the block runs,
157 * but instead the mutex is acquired and then immediately released. The correct usage is
159 * SkAutoMutexAcquire lock(&mutex);
163 * To prevent callers from instantiating your class without a name, use SK_REQUIRE_LOCAL_VAR
168 * #define classname(...) SK_REQUIRE_LOCAL_VAR(classname)
170 * This won't work with templates, and you must inline the class' constructors and destructors.
171 * Take a look at SkAutoFree and SkAutoMalloc in this file for examples.
173 #define SK_REQUIRE_LOCAL_VAR(classname) \
174 SK_COMPILE_ASSERT(false, missing_name_for_##classname)
176 ///////////////////////////////////////////////////////////////////////
179 * Fast type for signed 8 bits. Use for parameter passing and local variables,
185 * Fast type for unsigned 8 bits. Use for parameter passing and local
186 * variables, not for storage
188 typedef unsigned U8CPU;
191 * Fast type for signed 16 bits. Use for parameter passing and local variables,
197 * Fast type for unsigned 16 bits. Use for parameter passing and local
198 * variables, not for storage
200 typedef unsigned U16CPU;
203 * Meant to be faster than bool (doesn't promise to be 0 or 1,
209 * Meant to be a small version of bool, for storage purposes. Will be 0 or 1
211 typedef uint8_t SkBool8;
214 SK_API int8_t SkToS8(intmax_t);
215 SK_API uint8_t SkToU8(uintmax_t);
216 SK_API int16_t SkToS16(intmax_t);
217 SK_API uint16_t SkToU16(uintmax_t);
218 SK_API int32_t SkToS32(intmax_t);
219 SK_API uint32_t SkToU32(uintmax_t);
220 SK_API int SkToInt(intmax_t);
221 SK_API unsigned SkToUInt(uintmax_t);
223 #define SkToS8(x) ((int8_t)(x))
224 #define SkToU8(x) ((uint8_t)(x))
225 #define SkToS16(x) ((int16_t)(x))
226 #define SkToU16(x) ((uint16_t)(x))
227 #define SkToS32(x) ((int32_t)(x))
228 #define SkToU32(x) ((uint32_t)(x))
229 #define SkToInt(x) ((int)(x))
230 #define SkToUInt(x) ((unsigned)(x))
233 /** Returns 0 or 1 based on the condition
235 #define SkToBool(cond) ((cond) != 0)
237 #define SK_MaxS16 32767
238 #define SK_MinS16 -32767
239 #define SK_MaxU16 0xFFFF
241 #define SK_MaxS32 0x7FFFFFFF
242 #define SK_MinS32 -SK_MaxS32
243 #define SK_MaxU32 0xFFFFFFFF
245 #define SK_NaN32 (1 << 31)
247 /** Returns true if the value can be represented with signed 16bits
249 static inline bool SkIsS16(long x) {
250 return (int16_t)x == x;
253 /** Returns true if the value can be represented with unsigned 16bits
255 static inline bool SkIsU16(long x) {
256 return (uint16_t)x == x;
259 //////////////////////////////////////////////////////////////////////////////
261 #define SK_OFFSETOF(type, field) (size_t)((char*)&(((type*)1)->field) - (char*)1)
264 /** Returns the number of entries in an array (not a pointer)
266 #define SK_ARRAY_COUNT(array) (sizeof(array) / sizeof(array[0]))
268 #define SkAlign2(x) (((x) + 1) >> 1 << 1)
269 #define SkIsAlign2(x) (0 == ((x) & 1))
271 #define SkAlign4(x) (((x) + 3) >> 2 << 2)
272 #define SkIsAlign4(x) (0 == ((x) & 3))
274 #define SkAlign8(x) (((x) + 7) >> 3 << 3)
275 #define SkIsAlign8(x) (0 == ((x) & 7))
277 typedef uint32_t SkFourByteTag;
278 #define SkSetFourByteTag(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
280 /** 32 bit integer to hold a unicode value
282 typedef int32_t SkUnichar;
283 /** 32 bit value to hold a millisecond count
285 typedef uint32_t SkMSec;
286 /** 1 second measured in milliseconds
288 #define SK_MSec1 1000
289 /** maximum representable milliseconds
291 #define SK_MSecMax 0x7FFFFFFF
292 /** Returns a < b for milliseconds, correctly handling wrap-around from 0xFFFFFFFF to 0
294 #define SkMSec_LT(a, b) ((int32_t)(a) - (int32_t)(b) < 0)
295 /** Returns a <= b for milliseconds, correctly handling wrap-around from 0xFFFFFFFF to 0
297 #define SkMSec_LE(a, b) ((int32_t)(a) - (int32_t)(b) <= 0)
299 /****************************************************************************
300 The rest of these only build with C++
304 /** Faster than SkToBool for integral conditions. Returns 0 or 1
306 static inline int Sk32ToBool(uint32_t n) {
307 return (n | (0-n)) >> 31;
310 /** Generic swap function. Classes with efficient swaps should specialize this function to take
311 their fast path. This function is used by SkTSort. */
312 template <typename T> inline void SkTSwap(T& a, T& b) {
318 static inline int32_t SkAbs32(int32_t value) {
325 template <typename T> inline T SkTAbs(T value) {
332 static inline int32_t SkMax32(int32_t a, int32_t b) {
338 static inline int32_t SkMin32(int32_t a, int32_t b) {
344 template <typename T> const T& SkTMin(const T& a, const T& b) {
345 return (a < b) ? a : b;
348 template <typename T> const T& SkTMax(const T& a, const T& b) {
349 return (b < a) ? a : b;
352 static inline int32_t SkSign32(int32_t a) {
353 return (a >> 31) | ((unsigned) -a >> 31);
356 static inline int32_t SkFastMin32(int32_t value, int32_t max) {
363 /** Returns signed 32 bit value pinned between min and max, inclusively
365 static inline int32_t SkPin32(int32_t value, int32_t min, int32_t max) {
375 static inline uint32_t SkSetClearShift(uint32_t bits, bool cond,
377 SkASSERT((int)cond == 0 || (int)cond == 1);
378 return (bits & ~(1 << shift)) | ((int)cond << shift);
381 static inline uint32_t SkSetClearMask(uint32_t bits, bool cond,
383 return cond ? bits | mask : bits & ~mask;
386 ///////////////////////////////////////////////////////////////////////////////
388 /** Use to combine multiple bits in a bitmask in a type safe way.
390 template <typename T>
391 T SkTBitOr(T a, T b) {
396 * Use to cast a pointer to a different type, and maintaining strict-aliasing
398 template <typename Dst> Dst SkTCast(const void* ptr) {
407 //////////////////////////////////////////////////////////////////////////////
409 /** \class SkNoncopyable
411 SkNoncopyable is the base class for objects that may do not want to
412 be copied. It hides its copy-constructor and its assignment-operator.
414 class SK_API SkNoncopyable {
419 SkNoncopyable(const SkNoncopyable&);
420 SkNoncopyable& operator=(const SkNoncopyable&);
423 class SkAutoFree : SkNoncopyable {
425 SkAutoFree() : fPtr(NULL) {}
426 explicit SkAutoFree(void* ptr) : fPtr(ptr) {}
427 ~SkAutoFree() { sk_free(fPtr); }
429 /** Return the currently allocate buffer, or null
431 void* get() const { return fPtr; }
433 /** Assign a new ptr allocated with sk_malloc (or null), and return the
434 previous ptr. Note it is the caller's responsibility to sk_free the
437 void* set(void* ptr) {
443 /** Transfer ownership of the current ptr to the caller, setting the
444 internal reference to null. Note the caller is reponsible for calling
445 sk_free on the returned address.
447 void* detach() { return this->set(NULL); }
449 /** Free the current buffer, and set the internal reference to NULL. Same
450 as calling sk_free(detach())
460 SkAutoFree(const SkAutoFree&);
461 SkAutoFree& operator=(const SkAutoFree&);
463 #define SkAutoFree(...) SK_REQUIRE_LOCAL_VAR(SkAutoFree)
466 * Manage an allocated block of heap memory. This object is the sole manager of
467 * the lifetime of the block, so the caller must not call sk_free() or delete
468 * on the block, unless detach() was called.
470 class SkAutoMalloc : public SkNoncopyable {
472 explicit SkAutoMalloc(size_t size = 0) {
473 fPtr = size ? sk_malloc_throw(size) : NULL;
482 * Passed to reset to specify what happens if the requested size is smaller
483 * than the current size (and the current block was dynamically allocated).
487 * If the requested size is smaller than the current size, and the
488 * current block is dynamically allocated, free the old block and
489 * malloc a new block of the smaller size.
494 * If the requested size is smaller than the current size, and the
495 * current block is dynamically allocated, just return the old
502 * Reallocates the block to a new size. The ptr may or may not change.
504 void* reset(size_t size, OnShrink shrink = kAlloc_OnShrink, bool* didChangeAlloc = NULL) {
505 if (size == fSize || (kReuse_OnShrink == shrink && size < fSize)) {
506 if (NULL != didChangeAlloc) {
507 *didChangeAlloc = false;
513 fPtr = size ? sk_malloc_throw(size) : NULL;
515 if (NULL != didChangeAlloc) {
516 *didChangeAlloc = true;
523 * Releases the block back to the heap
530 * Return the allocated block.
532 void* get() { return fPtr; }
533 const void* get() const { return fPtr; }
535 /** Transfer ownership of the current ptr to the caller, setting the
536 internal reference to null. Note the caller is reponsible for calling
537 sk_free on the returned address.
548 size_t fSize; // can be larger than the requested size (see kReuse)
550 #define SkAutoMalloc(...) SK_REQUIRE_LOCAL_VAR(SkAutoMalloc)
553 * Manage an allocated block of memory. If the requested size is <= kSize, then
554 * the allocation will come from the stack rather than the heap. This object
555 * is the sole manager of the lifetime of the block, so the caller must not
556 * call sk_free() or delete on the block.
558 template <size_t kSize> class SkAutoSMalloc : SkNoncopyable {
561 * Creates initially empty storage. get() returns a ptr, but it is to
562 * a zero-byte allocation. Must call reset(size) to return an allocated
571 * Allocate a block of the specified size. If size <= kSize, then the
572 * allocation will come from the stack, otherwise it will be dynamically
575 explicit SkAutoSMalloc(size_t size) {
582 * Free the allocated block (if any). If the block was small enought to
583 * have been allocated on the stack (size <= kSize) then this does nothing.
586 if (fPtr != (void*)fStorage) {
592 * Return the allocated block. May return non-null even if the block is
593 * of zero size. Since this may be on the stack or dynamically allocated,
594 * the caller must not call sk_free() on it, but must rely on SkAutoSMalloc
597 void* get() const { return fPtr; }
600 * Return a new block of the requested size, freeing (as necessary) any
601 * previously allocated block. As with the constructor, if size <= kSize
602 * then the return block may be allocated locally, rather than from the
605 void* reset(size_t size,
606 SkAutoMalloc::OnShrink shrink = SkAutoMalloc::kAlloc_OnShrink,
607 bool* didChangeAlloc = NULL) {
608 size = (size < kSize) ? kSize : size;
609 bool alloc = size != fSize && (SkAutoMalloc::kAlloc_OnShrink == shrink || size > fSize);
610 if (NULL != didChangeAlloc) {
611 *didChangeAlloc = alloc;
614 if (fPtr != (void*)fStorage) {
619 SkASSERT(fPtr != fStorage); // otherwise we lied when setting didChangeAlloc.
622 fPtr = sk_malloc_flags(size, SK_MALLOC_THROW | SK_MALLOC_TEMP);
627 SkASSERT(fSize >= size && fSize >= kSize);
628 SkASSERT((fPtr == fStorage) || fSize > kSize);
634 size_t fSize; // can be larger than the requested size (see kReuse)
635 uint32_t fStorage[(kSize + 3) >> 2];
637 // Can't guard the constructor because it's a template class.