SkFixed.h File Reference

#include "include/private/base/SkAssert.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkMath.h"
#include "include/private/base/SkTPin.h"
#include <cstdint>

Go to the source code of this file.

Macros
#define	SK_Fixed1   (1 << 16)
#define	SK_FixedHalf   (1 << 15)
#define	SK_FixedQuarter   (1 << 14)
#define	SK_FixedMax   (0x7FFFFFFF)
#define	SK_FixedMin   (-SK_FixedMax)
#define	SK_FixedPI   (0x3243F)
#define	SK_FixedSqrt2   (92682)
#define	SK_FixedTanPIOver8   (0x6A0A)
#define	SK_FixedRoot2Over2   (0xB505)
#define	SkFixedToFloat(x)   ((x) * 1.52587890625e-5f)
#define	SkFloatToFixed(x)   sk_float_saturate2int((x) * SK_Fixed1)
#define	SkFloatToFixed_Check(x)   SkFloatToFixed(x)
#define	SkFixedToDouble(x)   ((x) * 1.52587890625e-5)
#define	SkDoubleToFixed(x)   ((SkFixed)((x) * SK_Fixed1))
#define	SkIntToFixed(n)   (SkFixed)((unsigned)(n) << 16)
#define	SkFixedRoundToInt(x)   (((x) + SK_FixedHalf) >> 16)
#define	SkFixedCeilToInt(x)   (((x) + SK_Fixed1 - 1) >> 16)
#define	SkFixedFloorToInt(x)   ((x) >> 16)
#define	SkFixedAve(a, b)   (((a) + (b)) >> 1)
#define	SkFixedDiv(numer, denom)    SkToS32(SkTPin<int64_t>((SkLeftShift((int64_t)(numer), 16) / (denom)), SK_MinS32, SK_MaxS32))
#define	SkFixedToScalar(x)   SkFixedToFloat(x)
#define	SkScalarToFixed(x)   SkFloatToFixed(x)
#define	SkFixed3232Max   SK_MaxS64
#define	SkFixed3232Min   (-SkFixed3232Max)
#define	SkIntToFixed3232(x)   (SkLeftShift((SkFixed3232)(x), 32))
#define	SkFixed3232ToInt(x)   ((int)((x) >> 32))
#define	SkFixedToFixed3232(x)   (SkLeftShift((SkFixed3232)(x), 16))
#define	SkFixed3232ToFixed(x)   ((SkFixed)((x) >> 16))
#define	SkFloatToFixed3232(x)   sk_float_saturate2int64((x) * (65536.0f * 65536.0f))
#define	SkFixed3232ToFloat(x)   (x * (1 / (65536.0f * 65536.0f)))
#define	SkScalarToFixed3232(x)   SkFloatToFixed3232(x)

Typedefs
typedef int32_t	SkFixed
typedef int64_t	SkFixed3232

Functions
static SkFixed	SkFixedRoundToFixed (SkFixed x)
static SkFixed	SkFixedCeilToFixed (SkFixed x)
static SkFixed	SkFixedFloorToFixed (SkFixed x)
static SkFixed	SkFixedMul (SkFixed a, SkFixed b)

Detailed Description

Types and macros for 16.16 fixed point

Definition in file SkFixed.h.

Macro Definition Documentation

SK_Fixed1

#define SK_Fixed1   (1 << 16)

Definition at line 26 of file SkFixed.h.

SK_FixedHalf

#define SK_FixedHalf   (1 << 15)

Definition at line 27 of file SkFixed.h.

SK_FixedMax

#define SK_FixedMax   (0x7FFFFFFF)

Definition at line 29 of file SkFixed.h.

SK_FixedMin

#define SK_FixedMin   (-SK_FixedMax)

Definition at line 30 of file SkFixed.h.

SK_FixedPI

#define SK_FixedPI   (0x3243F)

Definition at line 31 of file SkFixed.h.

SK_FixedQuarter

#define SK_FixedQuarter   (1 << 14)

Definition at line 28 of file SkFixed.h.

SK_FixedRoot2Over2

#define SK_FixedRoot2Over2   (0xB505)

Definition at line 34 of file SkFixed.h.

SK_FixedSqrt2

#define SK_FixedSqrt2   (92682)

Definition at line 32 of file SkFixed.h.

SK_FixedTanPIOver8

#define SK_FixedTanPIOver8   (0x6A0A)

Definition at line 33 of file SkFixed.h.

SkDoubleToFixed

#define SkDoubleToFixed

(

x

)

((SkFixed)((x) * SK_Fixed1))

Definition at line 56 of file SkFixed.h.

SkFixed3232Max

#define SkFixed3232Max   SK_MaxS64

Definition at line 131 of file SkFixed.h.

SkFixed3232Min

#define SkFixed3232Min   (-SkFixed3232Max)

Definition at line 132 of file SkFixed.h.

SkFixed3232ToFixed

#define SkFixed3232ToFixed

(

x

)

((SkFixed)((x) >> 16))

Definition at line 137 of file SkFixed.h.

SkFixed3232ToFloat

#define SkFixed3232ToFloat

(

x

)

(x * (1 / (65536.0f * 65536.0f)))

Definition at line 139 of file SkFixed.h.

SkFixed3232ToInt

#define SkFixed3232ToInt

(

x

)

((int)((x) >> 32))

Definition at line 135 of file SkFixed.h.

SkFixedAve

#define SkFixedAve	(		a,
			b
	)		(((a) + (b)) >> 1)

Definition at line 90 of file SkFixed.h.

SkFixedCeilToInt

#define SkFixedCeilToInt

(

x

)

(((x) + SK_Fixed1 - 1) >> 16)

Definition at line 77 of file SkFixed.h.

SkFixedDiv

#define SkFixedDiv	(		numer,
			denom
	)		SkToS32(SkTPin<int64_t>((SkLeftShift((int64_t)(numer), 16) / (denom)), SK_MinS32, SK_MaxS32))

Definition at line 93 of file SkFixed.h.

SkFixedFloorToInt

#define SkFixedFloorToInt

(

x

)

((x) >> 16)

Definition at line 78 of file SkFixed.h.

SkFixedRoundToInt

#define SkFixedRoundToInt

(

x

)

(((x) + SK_FixedHalf) >> 16)

Definition at line 76 of file SkFixed.h.

SkFixedToDouble

#define SkFixedToDouble

(

x

)

((x) * 1.52587890625e-5)

Definition at line 55 of file SkFixed.h.

SkFixedToFixed3232

#define SkFixedToFixed3232

(

x

)

(SkLeftShift((SkFixed3232)(x), 16))

Definition at line 136 of file SkFixed.h.

SkFixedToFloat

#define SkFixedToFloat

(

x

)

((x) * 1.52587890625e-5f)

Definition at line 41 of file SkFixed.h.

SkFixedToScalar

#define SkFixedToScalar

(

x

)

SkFixedToFloat(x)

Definition at line 124 of file SkFixed.h.

SkFloatToFixed

#define SkFloatToFixed

(

x

)

sk_float_saturate2int((x) * SK_Fixed1)

Definition at line 42 of file SkFixed.h.

SkFloatToFixed3232

#define SkFloatToFixed3232

(

x

)

sk_float_saturate2int64((x) * (65536.0f * 65536.0f))

Definition at line 138 of file SkFixed.h.

SkFloatToFixed_Check

#define SkFloatToFixed_Check

(

x

)

SkFloatToFixed(x)

Definition at line 52 of file SkFixed.h.

SkIntToFixed

#define SkIntToFixed

(

n

)

(SkFixed)((unsigned)(n) << 16)

Converts an integer to a SkFixed, asserting that the result does not overflow a 32 bit signed integer

Definition at line 73 of file SkFixed.h.

SkIntToFixed3232

#define SkIntToFixed3232

(

x

)

(SkLeftShift((SkFixed3232)(x), 32))

Definition at line 134 of file SkFixed.h.

SkScalarToFixed

#define SkScalarToFixed

(

x

)

SkFloatToFixed(x)

Definition at line 125 of file SkFixed.h.

SkScalarToFixed3232

#define SkScalarToFixed3232

(

x

)

SkFloatToFixed3232(x)

Definition at line 141 of file SkFixed.h.

Typedef Documentation

SkFixed

typedef int32_t SkFixed

32 bit signed integer used to represent fractions values with 16 bits to the right of the decimal point

Definition at line 25 of file SkFixed.h.

SkFixed3232

typedef int64_t SkFixed3232

Definition at line 129 of file SkFixed.h.

Function Documentation

SkFixedCeilToFixed()

static SkFixed SkFixedCeilToFixed ( SkFixed  x )

inlinestatic

Definition at line 83 of file SkFixed.h.

                                                    {
    return (SkFixed)( (uint32_t)(x + SK_Fixed1 - 1) & 0xFFFF0000 );
}

SkFixedFloorToFixed()

static SkFixed SkFixedFloorToFixed ( SkFixed  x )

inlinestatic

Definition at line 86 of file SkFixed.h.

                                                     {
    return (SkFixed)( (uint32_t)x & 0xFFFF0000 );
}

SkFixedMul()

static SkFixed SkFixedMul ( SkFixed  a, SkFixed  b  )

inlinestatic

Definition at line 96 of file SkFixed.h.

                                                       {
    return (SkFixed)((int64_t)a * b >> 16);
}

SkFixedRoundToFixed()

static SkFixed SkFixedRoundToFixed ( SkFixed  x )

inlinestatic

Definition at line 80 of file SkFixed.h.

                                                     {
    return (SkFixed)( (uint32_t)(x + SK_FixedHalf) & 0xFFFF0000 );
}