| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkTypes_DEFINED |
| #define SkTypes_DEFINED |
| |
| // IWYU pragma: begin_exports |
| |
| // In at least two known scenarios when using GCC with libc++: |
| // * GCC 4.8 targeting ARMv7 with NEON |
| // * GCC 4.9 targeting ARMv8 64 bit |
| // we need to typedef float float32_t (or include <arm_neon.h> which does that) |
| // before #including <memory>. This makes no sense. I'm not very interested in |
| // understanding why... these are old, bizarre platform configuration that we |
| // should just let die. |
| // See https://llvm.org/bugs/show_bug.cgi?id=25608 . |
| #include <ciso646> // Include something innocuous to define _LIBCPP_VERISON if it's libc++. |
| #if defined(__GNUC__) && __GNUC__ == 4 \ |
| && ((defined(__arm__) && (defined(__ARM_NEON__) || defined(__ARM_NEON))) || defined(__aarch64__)) \ |
| && defined(_LIBCPP_VERSION) |
| typedef float float32_t; |
| #include <memory> |
| #endif |
| |
| #include "SkPreConfig.h" |
| #include "SkUserConfig.h" |
| #include "SkPostConfig.h" |
| #include <stddef.h> |
| #include <stdint.h> |
| // IWYU pragma: end_exports |
| |
| #include <string.h> |
| |
| /** |
| * sk_careful_memcpy() is just like memcpy(), but guards against undefined behavior. |
| * |
| * It is undefined behavior to call memcpy() with null dst or src, even if len is 0. |
| * If an optimizer is "smart" enough, it can exploit this to do unexpected things. |
| * memcpy(dst, src, 0); |
| * if (src) { |
| * printf("%x\n", *src); |
| * } |
| * In this code the compiler can assume src is not null and omit the if (src) {...} check, |
| * unconditionally running the printf, crashing the program if src really is null. |
| * Of the compilers we pay attention to only GCC performs this optimization in practice. |
| */ |
| static inline void* sk_careful_memcpy(void* dst, const void* src, size_t len) { |
| // When we pass >0 len we had better already be passing valid pointers. |
| // So we just need to skip calling memcpy when len == 0. |
| if (len) { |
| memcpy(dst,src,len); |
| } |
| return dst; |
| } |
| |
| /** \file SkTypes.h |
| */ |
| |
| /** See SkGraphics::GetVersion() to retrieve these at runtime |
| */ |
| #define SKIA_VERSION_MAJOR 1 |
| #define SKIA_VERSION_MINOR 0 |
| #define SKIA_VERSION_PATCH 0 |
| |
| /* |
| memory wrappers to be implemented by the porting layer (platform) |
| */ |
| |
| /** Called internally if we run out of memory. The platform implementation must |
| not return, but should either throw an exception or otherwise exit. |
| */ |
| SK_API extern void sk_out_of_memory(void); |
| /** Called internally if we hit an unrecoverable error. |
| The platform implementation must not return, but should either throw |
| an exception or otherwise exit. |
| */ |
| SK_API extern void sk_abort_no_print(void); |
| |
| enum { |
| SK_MALLOC_TEMP = 0x01, //!< hint to sk_malloc that the requested memory will be freed in the scope of the stack frame |
| SK_MALLOC_THROW = 0x02 //!< instructs sk_malloc to call sk_throw if the memory cannot be allocated. |
| }; |
| /** Return a block of memory (at least 4-byte aligned) of at least the |
| specified size. If the requested memory cannot be returned, either |
| return null (if SK_MALLOC_TEMP bit is clear) or throw an exception |
| (if SK_MALLOC_TEMP bit is set). To free the memory, call sk_free(). |
| */ |
| SK_API extern void* sk_malloc_flags(size_t size, unsigned flags); |
| /** Same as sk_malloc(), but hard coded to pass SK_MALLOC_THROW as the flag |
| */ |
| SK_API extern void* sk_malloc_throw(size_t size); |
| /** Same as standard realloc(), but this one never returns null on failure. It will throw |
| an exception if it fails. |
| */ |
| SK_API extern void* sk_realloc_throw(void* buffer, size_t size); |
| /** Free memory returned by sk_malloc(). It is safe to pass null. |
| */ |
| SK_API extern void sk_free(void*); |
| |
| /** Much like calloc: returns a pointer to at least size zero bytes, or NULL on failure. |
| */ |
| SK_API extern void* sk_calloc(size_t size); |
| |
| /** Same as sk_calloc, but throws an exception instead of returning NULL on failure. |
| */ |
| SK_API extern void* sk_calloc_throw(size_t size); |
| |
| // bzero is safer than memset, but we can't rely on it, so... sk_bzero() |
| static inline void sk_bzero(void* buffer, size_t size) { |
| // Please c.f. sk_careful_memcpy. It's undefined behavior to call memset(null, 0, 0). |
| if (size) { |
| memset(buffer, 0, size); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifdef override_GLOBAL_NEW |
| #include <new> |
| |
| inline void* operator new(size_t size) { |
| return sk_malloc_throw(size); |
| } |
| |
| inline void operator delete(void* p) { |
| sk_free(p); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #define SK_INIT_TO_AVOID_WARNING = 0 |
| |
| #ifndef SkDebugf |
| SK_API void SkDebugf(const char format[], ...); |
| #endif |
| |
| #define SkREQUIRE_SEMICOLON_AFTER(code) do { code } while (false) |
| |
| #define SkASSERT_RELEASE(cond) \ |
| SkREQUIRE_SEMICOLON_AFTER(if (!(cond)) { SK_ABORT(#cond); } ) |
| |
| #ifdef SK_DEBUG |
| #define SkASSERT(cond) \ |
| SkREQUIRE_SEMICOLON_AFTER(if (!(cond)) { SK_ABORT("assert(" #cond ")"); }) |
| #define SkASSERTF(cond, fmt, ...) \ |
| SkREQUIRE_SEMICOLON_AFTER(if (!(cond)) { \ |
| SkDebugf(fmt"\n", __VA_ARGS__); \ |
| SK_ABORT("assert(" #cond ")"); \ |
| }) |
| #define SkDEBUGFAIL(message) SK_ABORT(message) |
| #define SkDEBUGFAILF(fmt, ...) SkASSERTF(false, fmt, ##__VA_ARGS__) |
| #define SkDEBUGCODE(...) __VA_ARGS__ |
| #define SkDECLAREPARAM(type, var) , type var |
| #define SkPARAM(var) , var |
| #define SkDEBUGF(args ) SkDebugf args |
| #define SkAssertResult(cond) SkASSERT(cond) |
| #else |
| #define SkASSERT(cond) |
| #define SkASSERTF(cond, fmt, ...) |
| #define SkDEBUGFAIL(message) |
| #define SkDEBUGFAILF(fmt, ...) |
| #define SkDEBUGCODE(...) |
| #define SkDEBUGF(args) |
| #define SkDECLAREPARAM(type, var) |
| #define SkPARAM(var) |
| |
| // unlike SkASSERT, this guy executes its condition in the non-debug build. |
| // The if is present so that this can be used with functions marked SK_WARN_UNUSED_RESULT. |
| #define SkAssertResult(cond) if (cond) {} do {} while(false) |
| #endif |
| |
| // Legacy macro names for SK_ABORT |
| #define SkFAIL(message) SK_ABORT(message) |
| #define sk_throw() SK_ABORT("sk_throw") |
| |
| #ifdef SK_IGNORE_TO_STRING |
| #define SK_TO_STRING_NONVIRT() |
| #define SK_TO_STRING_VIRT() |
| #define SK_TO_STRING_PUREVIRT() |
| #define SK_TO_STRING_OVERRIDE() |
| #else |
| class SkString; |
| // the 'toString' helper functions convert Sk* objects to human-readable |
| // form in developer mode |
| #define SK_TO_STRING_NONVIRT() void toString(SkString* str) const; |
| #define SK_TO_STRING_VIRT() virtual void toString(SkString* str) const; |
| #define SK_TO_STRING_PUREVIRT() virtual void toString(SkString* str) const = 0; |
| #define SK_TO_STRING_OVERRIDE() void toString(SkString* str) const override; |
| #endif |
| |
| /* |
| * Usage: SK_MACRO_CONCAT(a, b) to construct the symbol ab |
| * |
| * SK_MACRO_CONCAT_IMPL_PRIV just exists to make this work. Do not use directly |
| * |
| */ |
| #define SK_MACRO_CONCAT(X, Y) SK_MACRO_CONCAT_IMPL_PRIV(X, Y) |
| #define SK_MACRO_CONCAT_IMPL_PRIV(X, Y) X ## Y |
| |
| /* |
| * Usage: SK_MACRO_APPEND_LINE(foo) to make foo123, where 123 is the current |
| * line number. Easy way to construct |
| * unique names for local functions or |
| * variables. |
| */ |
| #define SK_MACRO_APPEND_LINE(name) SK_MACRO_CONCAT(name, __LINE__) |
| |
| /** |
| * For some classes, it's almost always an error to instantiate one without a name, e.g. |
| * { |
| * SkAutoMutexAcquire(&mutex); |
| * <some code> |
| * } |
| * In this case, the writer meant to hold mutex while the rest of the code in the block runs, |
| * but instead the mutex is acquired and then immediately released. The correct usage is |
| * { |
| * SkAutoMutexAcquire lock(&mutex); |
| * <some code> |
| * } |
| * |
| * To prevent callers from instantiating your class without a name, use SK_REQUIRE_LOCAL_VAR |
| * like this: |
| * class classname { |
| * <your class> |
| * }; |
| * #define classname(...) SK_REQUIRE_LOCAL_VAR(classname) |
| * |
| * This won't work with templates, and you must inline the class' constructors and destructors. |
| * Take a look at SkAutoFree and SkAutoMalloc in this file for examples. |
| */ |
| #define SK_REQUIRE_LOCAL_VAR(classname) \ |
| static_assert(false, "missing name for " #classname) |
| |
| /////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Fast type for signed 8 bits. Use for parameter passing and local variables, |
| * not for storage. |
| */ |
| typedef int S8CPU; |
| |
| /** |
| * Fast type for unsigned 8 bits. Use for parameter passing and local |
| * variables, not for storage |
| */ |
| typedef unsigned U8CPU; |
| |
| /** |
| * Fast type for signed 16 bits. Use for parameter passing and local variables, |
| * not for storage |
| */ |
| typedef int S16CPU; |
| |
| /** |
| * Fast type for unsigned 16 bits. Use for parameter passing and local |
| * variables, not for storage |
| */ |
| typedef unsigned U16CPU; |
| |
| /** |
| * Meant to be a small version of bool, for storage purposes. Will be 0 or 1 |
| */ |
| typedef uint8_t SkBool8; |
| |
| #include "../private/SkTFitsIn.h" |
| template <typename D, typename S> D SkTo(S s) { |
| SkASSERT(SkTFitsIn<D>(s)); |
| return static_cast<D>(s); |
| } |
| #define SkToS8(x) SkTo<int8_t>(x) |
| #define SkToU8(x) SkTo<uint8_t>(x) |
| #define SkToS16(x) SkTo<int16_t>(x) |
| #define SkToU16(x) SkTo<uint16_t>(x) |
| #define SkToS32(x) SkTo<int32_t>(x) |
| #define SkToU32(x) SkTo<uint32_t>(x) |
| #define SkToInt(x) SkTo<int>(x) |
| #define SkToUInt(x) SkTo<unsigned>(x) |
| #define SkToSizeT(x) SkTo<size_t>(x) |
| |
| /** Returns 0 or 1 based on the condition |
| */ |
| #define SkToBool(cond) ((cond) != 0) |
| |
| #define SK_MaxS16 32767 |
| #define SK_MinS16 -32767 |
| #define SK_MaxU16 0xFFFF |
| #define SK_MinU16 0 |
| #define SK_MaxS32 0x7FFFFFFF |
| #define SK_MinS32 -SK_MaxS32 |
| #define SK_MaxU32 0xFFFFFFFF |
| #define SK_MinU32 0 |
| #define SK_NaN32 ((int) (1U << 31)) |
| |
| /** Returns true if the value can be represented with signed 16bits |
| */ |
| static inline bool SkIsS16(long x) { |
| return (int16_t)x == x; |
| } |
| |
| /** Returns true if the value can be represented with unsigned 16bits |
| */ |
| static inline bool SkIsU16(long x) { |
| return (uint16_t)x == x; |
| } |
| |
| static inline int32_t SkLeftShift(int32_t value, int32_t shift) { |
| return (int32_t) ((uint32_t) value << shift); |
| } |
| |
| static inline int64_t SkLeftShift(int64_t value, int32_t shift) { |
| return (int64_t) ((uint64_t) value << shift); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| /** Returns the number of entries in an array (not a pointer) */ |
| template <typename T, size_t N> char (&SkArrayCountHelper(T (&array)[N]))[N]; |
| #define SK_ARRAY_COUNT(array) (sizeof(SkArrayCountHelper(array))) |
| |
| // Can be used to bracket data types that must be dense, e.g. hash keys. |
| #if defined(__clang__) // This should work on GCC too, but GCC diagnostic pop didn't seem to work! |
| #define SK_BEGIN_REQUIRE_DENSE _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic error \"-Wpadded\"") |
| #define SK_END_REQUIRE_DENSE _Pragma("GCC diagnostic pop") |
| #else |
| #define SK_BEGIN_REQUIRE_DENSE |
| #define SK_END_REQUIRE_DENSE |
| #endif |
| |
| #define SkAlign2(x) (((x) + 1) >> 1 << 1) |
| #define SkIsAlign2(x) (0 == ((x) & 1)) |
| |
| #define SkAlign4(x) (((x) + 3) >> 2 << 2) |
| #define SkIsAlign4(x) (0 == ((x) & 3)) |
| |
| #define SkAlign8(x) (((x) + 7) >> 3 << 3) |
| #define SkIsAlign8(x) (0 == ((x) & 7)) |
| |
| #define SkAlign16(x) (((x) + 15) >> 4 << 4) |
| #define SkIsAlign16(x) (0 == ((x) & 15)) |
| |
| #define SkAlignPtr(x) (sizeof(void*) == 8 ? SkAlign8(x) : SkAlign4(x)) |
| #define SkIsAlignPtr(x) (sizeof(void*) == 8 ? SkIsAlign8(x) : SkIsAlign4(x)) |
| |
| typedef uint32_t SkFourByteTag; |
| #define SkSetFourByteTag(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) |
| |
| /** 32 bit integer to hold a unicode value |
| */ |
| typedef int32_t SkUnichar; |
| |
| /** 16 bit unsigned integer to hold a glyph index |
| */ |
| typedef uint16_t SkGlyphID; |
| |
| /** 32 bit value to hold a millisecond duration |
| * Note that SK_MSecMax is about 25 days. |
| */ |
| typedef uint32_t SkMSec; |
| /** 1 second measured in milliseconds |
| */ |
| #define SK_MSec1 1000 |
| /** maximum representable milliseconds; 24d 20h 31m 23.647s. |
| */ |
| #define SK_MSecMax 0x7FFFFFFF |
| /** Returns a < b for milliseconds, correctly handling wrap-around from 0xFFFFFFFF to 0 |
| */ |
| #define SkMSec_LT(a, b) ((int32_t)(a) - (int32_t)(b) < 0) |
| /** Returns a <= b for milliseconds, correctly handling wrap-around from 0xFFFFFFFF to 0 |
| */ |
| #define SkMSec_LE(a, b) ((int32_t)(a) - (int32_t)(b) <= 0) |
| |
| /** The generation IDs in Skia reserve 0 has an invalid marker. |
| */ |
| #define SK_InvalidGenID 0 |
| /** The unique IDs in Skia reserve 0 has an invalid marker. |
| */ |
| #define SK_InvalidUniqueID 0 |
| |
| /**************************************************************************** |
| The rest of these only build with C++ |
| */ |
| #ifdef __cplusplus |
| |
| /** Faster than SkToBool for integral conditions. Returns 0 or 1 |
| */ |
| static inline constexpr int Sk32ToBool(uint32_t n) { |
| return (n | (0-n)) >> 31; |
| } |
| |
| /** Generic swap function. Classes with efficient swaps should specialize this function to take |
| their fast path. This function is used by SkTSort. */ |
| template <typename T> static inline void SkTSwap(T& a, T& b) { |
| T c(std::move(a)); |
| a = std::move(b); |
| b = std::move(c); |
| } |
| |
| static inline int32_t SkAbs32(int32_t value) { |
| SkASSERT(value != SK_NaN32); // The most negative int32_t can't be negated. |
| if (value < 0) { |
| value = -value; |
| } |
| return value; |
| } |
| |
| template <typename T> static inline T SkTAbs(T value) { |
| if (value < 0) { |
| value = -value; |
| } |
| return value; |
| } |
| |
| static inline int32_t SkMax32(int32_t a, int32_t b) { |
| if (a < b) |
| a = b; |
| return a; |
| } |
| |
| static inline int32_t SkMin32(int32_t a, int32_t b) { |
| if (a > b) |
| a = b; |
| return a; |
| } |
| |
| template <typename T> constexpr const T& SkTMin(const T& a, const T& b) { |
| return (a < b) ? a : b; |
| } |
| |
| template <typename T> constexpr const T& SkTMax(const T& a, const T& b) { |
| return (b < a) ? a : b; |
| } |
| |
| static inline int32_t SkSign32(int32_t a) { |
| return (a >> 31) | ((unsigned) -a >> 31); |
| } |
| |
| static inline int32_t SkFastMin32(int32_t value, int32_t max) { |
| if (value > max) { |
| value = max; |
| } |
| return value; |
| } |
| |
| /** Returns value pinned between min and max, inclusively. */ |
| template <typename T> static constexpr const T& SkTPin(const T& value, const T& min, const T& max) { |
| return SkTMax(SkTMin(value, max), min); |
| } |
| |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Indicates whether an allocation should count against a cache budget. |
| */ |
| enum class SkBudgeted : bool { |
| kNo = false, |
| kYes = true |
| }; |
| |
| /** |
| * Indicates whether a backing store needs to be an exact match or can be larger |
| * than is strictly necessary |
| */ |
| enum class SkBackingFit { |
| kApprox, |
| kExact |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /** Use to combine multiple bits in a bitmask in a type safe way. |
| */ |
| template <typename T> |
| T SkTBitOr(T a, T b) { |
| return (T)(a | b); |
| } |
| |
| /** |
| * Use to cast a pointer to a different type, and maintaining strict-aliasing |
| */ |
| template <typename Dst> Dst SkTCast(const void* ptr) { |
| union { |
| const void* src; |
| Dst dst; |
| } data; |
| data.src = ptr; |
| return data.dst; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| /** \class SkNoncopyable |
| |
| SkNoncopyable is the base class for objects that do not want to |
| be copied. It hides its copy-constructor and its assignment-operator. |
| */ |
| class SK_API SkNoncopyable { |
| public: |
| SkNoncopyable() {} |
| |
| private: |
| SkNoncopyable(const SkNoncopyable&); |
| SkNoncopyable& operator=(const SkNoncopyable&); |
| }; |
| |
| class SkAutoFree : SkNoncopyable { |
| public: |
| SkAutoFree() : fPtr(NULL) {} |
| explicit SkAutoFree(void* ptr) : fPtr(ptr) {} |
| ~SkAutoFree() { sk_free(fPtr); } |
| |
| /** Return the currently allocate buffer, or null |
| */ |
| void* get() const { return fPtr; } |
| |
| /** Assign a new ptr allocated with sk_malloc (or null), and return the |
| previous ptr. Note it is the caller's responsibility to sk_free the |
| returned ptr. |
| */ |
| void* set(void* ptr) { |
| void* prev = fPtr; |
| fPtr = ptr; |
| return prev; |
| } |
| |
| /** Transfer ownership of the current ptr to the caller, setting the |
| internal reference to null. Note the caller is reponsible for calling |
| sk_free on the returned address. |
| */ |
| void* release() { return this->set(NULL); } |
| |
| /** Free the current buffer, and set the internal reference to NULL. Same |
| as calling sk_free(release()) |
| */ |
| void reset() { |
| sk_free(fPtr); |
| fPtr = NULL; |
| } |
| |
| private: |
| void* fPtr; |
| // illegal |
| SkAutoFree(const SkAutoFree&); |
| SkAutoFree& operator=(const SkAutoFree&); |
| }; |
| #define SkAutoFree(...) SK_REQUIRE_LOCAL_VAR(SkAutoFree) |
| |
| /** |
| * Manage an allocated block of heap memory. This object is the sole manager of |
| * the lifetime of the block, so the caller must not call sk_free() or delete |
| * on the block, unless release() was called. |
| */ |
| class SkAutoMalloc : SkNoncopyable { |
| public: |
| explicit SkAutoMalloc(size_t size = 0) { |
| fPtr = size ? sk_malloc_throw(size) : NULL; |
| fSize = size; |
| } |
| |
| ~SkAutoMalloc() { |
| sk_free(fPtr); |
| } |
| |
| /** |
| * Passed to reset to specify what happens if the requested size is smaller |
| * than the current size (and the current block was dynamically allocated). |
| */ |
| enum OnShrink { |
| /** |
| * If the requested size is smaller than the current size, and the |
| * current block is dynamically allocated, free the old block and |
| * malloc a new block of the smaller size. |
| */ |
| kAlloc_OnShrink, |
| |
| /** |
| * If the requested size is smaller than the current size, and the |
| * current block is dynamically allocated, just return the old |
| * block. |
| */ |
| kReuse_OnShrink |
| }; |
| |
| /** |
| * Reallocates the block to a new size. The ptr may or may not change. |
| */ |
| void* reset(size_t size = 0, OnShrink shrink = kAlloc_OnShrink, bool* didChangeAlloc = NULL) { |
| if (size == fSize || (kReuse_OnShrink == shrink && size < fSize)) { |
| if (didChangeAlloc) { |
| *didChangeAlloc = false; |
| } |
| return fPtr; |
| } |
| |
| sk_free(fPtr); |
| fPtr = size ? sk_malloc_throw(size) : NULL; |
| fSize = size; |
| if (didChangeAlloc) { |
| *didChangeAlloc = true; |
| } |
| |
| return fPtr; |
| } |
| |
| /** |
| * Return the allocated block. |
| */ |
| void* get() { return fPtr; } |
| const void* get() const { return fPtr; } |
| |
| /** Transfer ownership of the current ptr to the caller, setting the |
| internal reference to null. Note the caller is reponsible for calling |
| sk_free on the returned address. |
| */ |
| void* release() { |
| void* ptr = fPtr; |
| fPtr = NULL; |
| fSize = 0; |
| return ptr; |
| } |
| |
| private: |
| void* fPtr; |
| size_t fSize; // can be larger than the requested size (see kReuse) |
| }; |
| #define SkAutoMalloc(...) SK_REQUIRE_LOCAL_VAR(SkAutoMalloc) |
| |
| /** |
| * Manage an allocated block of memory. If the requested size is <= kSizeRequested (or slightly |
| * more), then the allocation will come from the stack rather than the heap. This object is the |
| * sole manager of the lifetime of the block, so the caller must not call sk_free() or delete on |
| * the block. |
| */ |
| template <size_t kSizeRequested> class SkAutoSMalloc : SkNoncopyable { |
| public: |
| /** |
| * Creates initially empty storage. get() returns a ptr, but it is to a zero-byte allocation. |
| * Must call reset(size) to return an allocated block. |
| */ |
| SkAutoSMalloc() { |
| fPtr = fStorage; |
| fSize = kSize; |
| } |
| |
| /** |
| * Allocate a block of the specified size. If size <= kSizeRequested (or slightly more), then |
| * the allocation will come from the stack, otherwise it will be dynamically allocated. |
| */ |
| explicit SkAutoSMalloc(size_t size) { |
| fPtr = fStorage; |
| fSize = kSize; |
| this->reset(size); |
| } |
| |
| /** |
| * Free the allocated block (if any). If the block was small enough to have been allocated on |
| * the stack, then this does nothing. |
| */ |
| ~SkAutoSMalloc() { |
| if (fPtr != (void*)fStorage) { |
| sk_free(fPtr); |
| } |
| } |
| |
| /** |
| * Return the allocated block. May return non-null even if the block is of zero size. Since |
| * this may be on the stack or dynamically allocated, the caller must not call sk_free() on it, |
| * but must rely on SkAutoSMalloc to manage it. |
| */ |
| void* get() const { return fPtr; } |
| |
| /** |
| * Return a new block of the requested size, freeing (as necessary) any previously allocated |
| * block. As with the constructor, if size <= kSizeRequested (or slightly more) then the return |
| * block may be allocated locally, rather than from the heap. |
| */ |
| void* reset(size_t size, |
| SkAutoMalloc::OnShrink shrink = SkAutoMalloc::kAlloc_OnShrink, |
| bool* didChangeAlloc = NULL) { |
| size = (size < kSize) ? kSize : size; |
| bool alloc = size != fSize && (SkAutoMalloc::kAlloc_OnShrink == shrink || size > fSize); |
| if (didChangeAlloc) { |
| *didChangeAlloc = alloc; |
| } |
| if (alloc) { |
| if (fPtr != (void*)fStorage) { |
| sk_free(fPtr); |
| } |
| |
| if (size == kSize) { |
| SkASSERT(fPtr != fStorage); // otherwise we lied when setting didChangeAlloc. |
| fPtr = fStorage; |
| } else { |
| fPtr = sk_malloc_flags(size, SK_MALLOC_THROW | SK_MALLOC_TEMP); |
| } |
| |
| fSize = size; |
| } |
| SkASSERT(fSize >= size && fSize >= kSize); |
| SkASSERT((fPtr == fStorage) || fSize > kSize); |
| return fPtr; |
| } |
| |
| private: |
| // Align up to 32 bits. |
| static const size_t kSizeAlign4 = SkAlign4(kSizeRequested); |
| #if defined(GOOGLE3) |
| // Stack frame size is limited for GOOGLE3. 4k is less than the actual max, but some functions |
| // have multiple large stack allocations. |
| static const size_t kMaxBytes = 4 * 1024; |
| static const size_t kSize = kSizeRequested > kMaxBytes ? kMaxBytes : kSizeAlign4; |
| #else |
| static const size_t kSize = kSizeAlign4; |
| #endif |
| |
| void* fPtr; |
| size_t fSize; // can be larger than the requested size (see kReuse) |
| uint32_t fStorage[kSize >> 2]; |
| }; |
| // Can't guard the constructor because it's a template class. |
| |
| #endif /* C++ */ |
| |
| #endif |