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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.
A high-performance filter, with quality similar to
A reasonable-performance filter, with quality similar to
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.