feCompositeOperatorAttribute: operator

In mslegrand/svgR: svgR is an R DSL to generate svg markup

Description

Governs the behaviour of the composite operation.

Available Attribute Values

The value can be any one of the following:

'over'

Specifies to apply the over operator (aka Painters algorithm) Used to display both in1 and in2 but places in1 over in2. (aka. Painters algorithm)

'in'

Specifies to apply the Porter/Duff in operator. Used to display only the portion of in1 intersecting in2 without displaying any portion of in2.

'out'

Specifies to apply the Porter/Duff out operator, Used to display only the portion of in1 outside in2 and without displaying any portion of in2.

'atop'

Specifies to apply the Porter/Duff atop operator. Used to display the portion of in1 inside in2, and the portion of in2 outside in1.

'xor'

Specifies to apply the Porter/Duff xor operator. Used to display those portions in1 and in2 that do not intersect.

'arithmetic'

Specifies the arithmetic operator, which is linear in in1, in2 and in1 \times in2.

@section Composite Operator Details: The following defines each composite operator. In particular, how the resulting output alpha channel (α_{out}) and the resulting color channels \C_{out}) are computed from the input channels of in1 and in2.

over operator

α_{out} = α_{in1} + α_{in2} (1-α_{in1})

α_{out} \times C_{out} = α_{in1} C_{in1} + α_{in2} (1-α_{in1}) C_{in2}

in operator

α_{out} = α_{in1} α_{in2}

α_{out} \times C_{out} = α_{in1} α_{in2} C_{in1}

out operator

α_{out} = α_{in1} (1- α_{in2}) )

α_{out} \times C_{out} = α_{in1} (1- α_{in2}) C_{in1}

atop operator

α_{out} = α_{in1} α_{in2} + (1-α_{in1}) α_{in2}

α_{out} \times C_{out} = α_{in1} α_{in2} C_{in1} + α_{in2} (1-α_{in1}) C_{in2}

xor operator

α_{out} = α_{in1} ( 1- α_{in2}) + (1-α_{in1}) α_{in2}

α_{out} \times C_{out} = α_{in1}( 1- α_{in2}) C_{in1} + α_{in2} (1-α_{in1}) C_{in2}

arithemetic operator

α_{out} = max(0,min(1,k1 α_{in1} α_{in2} + k2 α_{in1}+ k3 α_{in2} +k4))

C_{out}= k1 C_{in1} C_{in2} + k2 C_{in1} + k3 C_{in2} + k4

#'

Used by the Elements

Filter Primitive Elements

feComposite

mslegrand/svgR documentation built on Jan. 21, 2020, 2:59 p.m.