PorterDuff class final Blending

A BlendMode that uses Porter-Duff coefficients to blend colors.

A custom BlendMode can be created by providing custom coefficients to the PorterDuff constructor:

// Creates a custom blend mode that always returns zero.
final customBlendMode = PorterDuff(PorterDuff.zero, PorterDuff.one);

Implemented types

• BlendMode

Constructors

PorterDuff(double _src(double, double), double _dst(double, double))

Creates a blend mode with Porter-Duff coefficients.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

getBlend<S, T>(PixelFormat<S, void> srcFormat, PixelFormat<T, void> dstFormat) → T Function(S src, T dst)

Returns a function that blends two pixels together.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

dst(double srcAlpha, double dstAlpha) → double

Returns the destination alpha channel (dstAlpha).

one(double srcAlpha, double dstAlpha) → double

Always returns one (1.0).

oneMinusDst(double srcAlpha, double dstAlpha) → double

Returns one minus the destination alpha channel (1 - dstAlpha).

oneMinusSrc(double srcAlpha, double dstAlpha) → double

Returns one minus the source alpha channel (1 - srcAlpha).

src(double srcAlpha, double dstAlpha) → double

Returns the source alpha channel (srcAlpha).

zero(double srcAlpha, double dstAlpha) → double

Always returns zero (0.0).