SkTypes.h

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/*
 * 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>

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;
}

#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)
*/

SK_API extern void sk_out_of_memory(void);
SK_API extern void sk_abort_no_print(void);

enum {
    SK_MALLOC_TEMP  = 0x01, 
    SK_MALLOC_THROW = 0x02  
};
SK_API extern void* sk_malloc_flags(size_t size, unsigned flags);
SK_API extern void* sk_malloc_throw(size_t size);
SK_API extern void* sk_realloc_throw(void* buffer, size_t size);
SK_API extern void sk_free(void*);

SK_API extern void* sk_calloc(size_t size);

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__)

#define SK_REQUIRE_LOCAL_VAR(classname) \
    static_assert(false, "missing name for " #classname)


typedef int S8CPU;

typedef unsigned U8CPU;

typedef int S16CPU;

typedef unsigned U16CPU;

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)

#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))

static inline bool SkIsS16(long x) {
    return (int16_t)x == x;
}

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);
}


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))

typedef int32_t SkUnichar;

typedef uint16_t SkGlyphID;

typedef uint32_t SkMSec;
#define SK_MSec1 1000

#define SK_MSecMax 0x7FFFFFFF

#define SkMSec_LT(a, b)     ((int32_t)(a) - (int32_t)(b) < 0)

#define SkMSec_LE(a, b)     ((int32_t)(a) - (int32_t)(b) <= 0)

#define SK_InvalidGenID     0

#define SK_InvalidUniqueID  0

/****************************************************************************
    The rest of these only build with C++
*/
#ifdef __cplusplus

static inline constexpr int Sk32ToBool(uint32_t n) {
    return (n | (0-n)) >> 31;
}

template <typename T> inline void SkTSwap(T& a, T& b) {
    T c(a);
    a = b;
    b = 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> 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;
}

template <typename T> static constexpr const T& SkTPin(const T& value, const T& min, const T& max) {
    return SkTMax(SkTMin(value, max), min);
}



enum class SkBudgeted : bool {
    kNo  = false,
    kYes = true
};

enum class SkBackingFit {
    kApprox,
    kExact
};


template <typename T>
T SkTBitOr(T a, T b) {
    return (T)(a | b);
}

template <typename Dst> Dst SkTCast(const void* ptr) {
    union {
        const void* src;
        Dst dst;
    } data;
    data.src = ptr;
    return data.dst;
}


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); }

    void* get() const { return fPtr; }

    void* set(void* ptr) {
        void* prev = fPtr;
        fPtr = ptr;
        return prev;
    }

    void* release() { return this->set(NULL); }

    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)

class SkAutoMalloc : SkNoncopyable {
public:
    explicit SkAutoMalloc(size_t size = 0) {
        fPtr = size ? sk_malloc_throw(size) : NULL;
        fSize = size;
    }

    ~SkAutoMalloc() {
        sk_free(fPtr);
    }

    enum OnShrink {
        kAlloc_OnShrink,

        kReuse_OnShrink
    };

    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;
    }

    void* get() { return fPtr; }
    const void* get() const { return fPtr; }

    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)

template <size_t kSizeRequested> class SkAutoSMalloc : SkNoncopyable {
public:
    SkAutoSMalloc() {
        fPtr = fStorage;
        fSize = kSize;
    }

    explicit SkAutoSMalloc(size_t size) {
        fPtr = fStorage;
        fSize = kSize;
        this->reset(size);
    }

    ~SkAutoSMalloc() {
        if (fPtr != (void*)fStorage) {
            sk_free(fPtr);
        }
    }

    void* get() const { return fPtr; }

    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