The CairoFilter class
A CairoFilter is used to indicate what filtering should be applied when reading pixel values from patterns. See CairoPattern::setSource or cairo_pattern_set_source() for indicating the desired filter to be used with a particular pattern.
CairoFilter Node Types
A high-performance filter, with quality similar to CairoFilter::NEAREST
A reasonable-performance filter, with quality similar to CairoFilter::BILINEAR
The highest-quality available, performance may not be suitable for interactive use.
Linear interpolation in two dimensions
This filter value is currently unimplemented, and should not be used in current code.