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.. _feComposite:
feComposite Filter Element
==========================
.. seealso:: http://www.w3.org/TR/SVG11/filters.html#feCompositeElement
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: :ref:`filter_primitive`
SVG Attributes
--------------
* **in** -- (see :ref:`in <in_attr>` attribute)
* **operator** -- ``'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 ``'over'`` were specified.
* **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 :ref:`in <in_attr>` attribute)
The second input image to the compositing operation. This attribute can
take on the same values as the **in** attribute.
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