SkSRGBColorSpaceLuminance Class Reference

Inheritance diagram for SkSRGBColorSpaceLuminance:

Private Member Functions
SkScalar	toLuma (SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const override
SkScalar	fromLuma (SkScalar SkDEBUGCODE(gamma), SkScalar luma) const override

Additional Inherited Members
Public Member Functions inherited from SkColorSpaceLuminance
virtual	~SkColorSpaceLuminance ()
virtual SkScalar	toLuma (SkScalar gamma, SkScalar luminance) const =0
virtual SkScalar	fromLuma (SkScalar gamma, SkScalar luma) const =0
Static Public Member Functions inherited from SkColorSpaceLuminance
static U8CPU	computeLuminance (SkScalar gamma, SkColor c)
static const SkColorSpaceLuminance &	Fetch (SkScalar gamma)

Detailed Description

Definition at line 37 of file SkMaskGamma.cpp.

Member Function Documentation

fromLuma()

SkScalar SkSRGBColorSpaceLuminance::fromLuma ( SkScalar   SkDEBUGCODEgamma, SkScalar  luma  ) const

inlineoverrideprivate

Definition at line 48 of file SkMaskGamma.cpp.

                                                                                 {
        SkASSERT(0 == gamma);
        //The magic numbers are derived from the sRGB specification.
        //See http://www.color.org/chardata/rgb/srgb.xalter .
        if (luma <= 0.0031308f) {
            return luma * 12.92f;
        }
        return 1.055f * SkScalarPow(luma, SkScalarInvert(2.4f))
               - 0.055f;
    }

toLuma()

SkScalar SkSRGBColorSpaceLuminance::toLuma ( SkScalar   SkDEBUGCODEgamma, SkScalar  luminance  ) const

inlineoverrideprivate

Definition at line 38 of file SkMaskGamma.cpp.

                                                                                    {
        SkASSERT(0 == gamma);
        //The magic numbers are derived from the sRGB specification.
        //See http://www.color.org/chardata/rgb/srgb.xalter .
        if (luminance <= 0.04045f) {
            return luminance / 12.92f;
        }
        return SkScalarPow((luminance + 0.055f) / 1.055f,
                        2.4f);
    }

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

• third_party/skia/src/core/SkMaskGamma.cpp