SkUnPreMultiply Class Reference

#include <SkUnPreMultiply.h>

Public Types
typedef uint32_t	Scale

Static Public Member Functions
static const Scale *	GetScaleTable ()
static Scale	GetScale (U8CPU alpha)
static U8CPU	ApplyScale (Scale scale, U8CPU component)
static SkColor	PMColorToColor (SkPMColor c)

Detailed Description

Definition at line 17 of file SkUnPreMultiply.h.

Member Typedef Documentation

Scale

typedef uint32_t SkUnPreMultiply::Scale

Definition at line 19 of file SkUnPreMultiply.h.

Member Function Documentation

ApplyScale()

static U8CPU SkUnPreMultiply::ApplyScale ( Scale  scale, U8CPU  component  )

inlinestatic

Usage:

const Scale* table = SkUnPreMultiply::GetScaleTable();

for (...) { unsigned a = ... SkUnPreMultiply::Scale scale = table[a];

red = SkUnPreMultiply::ApplyScale(scale, red); ... now red is unpremultiplied }

Definition at line 44 of file SkUnPreMultiply.h.

                                                          {
        SkASSERT(component <= 255);
        return (scale * component + (1 << 23)) >> 24;
    }

GetScale()

static Scale SkUnPreMultiply::GetScale ( U8CPU  alpha )

inlinestatic

Definition at line 26 of file SkUnPreMultiply.h.

                                       {
        SkASSERT(alpha <= 255);
        return gTable[alpha];
    }

GetScaleTable()

static const Scale * SkUnPreMultiply::GetScaleTable ( )

inlinestatic

Definition at line 22 of file SkUnPreMultiply.h.

                                        {
        return gTable;
    }

PMColorToColor()

SkColor SkUnPreMultiply::PMColorToColor ( SkPMColor  c )

static

Definition at line 11 of file SkUnPreMultiply.cpp.

                                                   {
    const unsigned a = SkGetPackedA32(c);
    const Scale scale = GetScale(a);
    return SkColorSetARGB(a,
                          ApplyScale(scale, SkGetPackedR32(c)),
                          ApplyScale(scale, SkGetPackedG32(c)),
                          ApplyScale(scale, SkGetPackedB32(c)));
}

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The documentation for this class was generated from the following files:

• third_party/skia/include/core/SkUnPreMultiply.h
• third_party/skia/src/core/SkUnPreMultiply.cpp