feComposite Filter Element¶
This filter performs the combination of the two input images pixel-wise in image space using one of the Porter-Duff compositing operations: over, in, atop, out, xor. Additionally, a component-wise arithmetic operation (with the result clamped between [0..1]) can be applied.
The arithmetic operation is useful for combining the output from the feDiffuseLighting and feSpecularLighting filters with texture data. It is also useful for implementing dissolve. If the arithmetic operation is chosen, each result pixel is computed using the following formula:
result = k1*i1*i2 + k2*i1 + k3*i2 + k4
For this filter primitive, the extent of the resulting image might grow as described in the section that describes the filter primitive subregion.
For common properties see: Filter Primitives Overview
in – (see in attribute)
'over | in | out | atop | xor | arithmetic
The compositing operation that is to be performed. All of the operator types except arithmetic match the correspond operation as described in [PORTERDUFF]. The arithmetic operator is described above. If attribute operator is not specified, then the effect is as if a value of
k1, k2, k3, k4 – <number>
Only applicable if operator =
'arithmetic'. If the attribute is not specified, the effect is as if a value of 0 were specified.
in2 – (see in attribute)
The second input image to the compositing operation. This attribute can take on the same values as the in attribute.