SkFDot6.h File Reference

#include "include/core/SkScalar.h"
#include "include/private/base/SkFixed.h"
#include "include/private/base/SkMath.h"
#include "include/private/base/SkTo.h"

Go to the source code of this file.

Macros
#define	SK_FDot6One   (64)
#define	SK_FDot6Half   (32)
#define	SkIntToFDot6(x)   ((x) << 6)
#define	SkFDot6Floor(x)   ((x) >> 6)
#define	SkFDot6Ceil(x)   (((x) + 63) >> 6)
#define	SkFDot6Round(x)   (((x) + 32) >> 6)
#define	SkFixedToFDot6(x)   ((x) >> 10)
#define	SkScalarToFDot6(x)   (SkFDot6)((x) * 64)
#define	SkFDot6ToScalar(x)   ((SkScalar)(x) * 0.015625f)
#define	SkFDot6ToFloat   SkFDot6ToScalar

Typedefs
typedef int32_t	SkFDot6

Functions
SkFDot6	SkScalarRoundToFDot6 (SkScalar x, int shift=0)
SkFixed	SkFDot6ToFixed (SkFDot6 x)
SkFixed	SkFDot6Div (SkFDot6 a, SkFDot6 b)

Macro Definition Documentation

SK_FDot6Half

#define SK_FDot6Half   (32)

Definition at line 41 of file SkFDot6.h.

SK_FDot6One

#define SK_FDot6One   (64)

Definition at line 40 of file SkFDot6.h.

SkFDot6Ceil

#define SkFDot6Ceil

(

x

)

(((x) + 63) >> 6)

Definition at line 53 of file SkFDot6.h.

SkFDot6Floor

#define SkFDot6Floor

(

x

)

((x) >> 6)

Definition at line 52 of file SkFDot6.h.

SkFDot6Round

#define SkFDot6Round

(

x

)

(((x) + 32) >> 6)

Definition at line 54 of file SkFDot6.h.

SkFDot6ToFloat

#define SkFDot6ToFloat   SkFDot6ToScalar

Definition at line 66 of file SkFDot6.h.

SkFDot6ToScalar

#define SkFDot6ToScalar

(

x

)

((SkScalar)(x) * 0.015625f)

Definition at line 65 of file SkFDot6.h.

SkFixedToFDot6

#define SkFixedToFDot6

(

x

)

((x) >> 10)

Definition at line 56 of file SkFDot6.h.

SkIntToFDot6

#define SkIntToFDot6

(

x

)

((x) << 6)

Definition at line 49 of file SkFDot6.h.

SkScalarToFDot6

#define SkScalarToFDot6

(

x

)

(SkFDot6)((x) * 64)

Definition at line 64 of file SkFDot6.h.

Typedef Documentation

SkFDot6

typedef int32_t SkFDot6

Definition at line 16 of file SkFDot6.h.

Function Documentation

SkFDot6Div()

SkFixed SkFDot6Div ( SkFDot6  a, SkFDot6  b  )

inline

Definition at line 68 of file SkFDot6.h.

                                                {
    SkASSERT(b != 0);
 
    if (SkTFitsIn<int16_t>(a)) {
        return SkLeftShift(a, 16) / b;
    } else {
        return SkFixedDiv(a, b);
    }
}

SkFDot6ToFixed()

SkFixed SkFDot6ToFixed ( SkFDot6  x )

inline

Definition at line 58 of file SkFDot6.h.

                                         {
    SkASSERT((SkLeftShift(x, 10) >> 10) == x);
 
    return SkLeftShift(x, 10);
}

SkScalarRoundToFDot6()

SkFDot6 SkScalarRoundToFDot6 ( SkScalar  x, int  shift = 0  )

inline

Definition at line 23 of file SkFDot6.h.

{
    union {
        double  fDouble;
        int32_t fBits[2];
    } tmp;
    int fractionalBits = 6 + shift;
    double magic = (1LL << (52 - (fractionalBits))) * 1.5;
 
    tmp.fDouble = SkScalarToDouble(x) + magic;
#ifdef SK_CPU_BENDIAN
    return tmp.fBits[1];
#else
    return tmp.fBits[0];
#endif
}