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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.
CairoFilter::FAST A high-performance filter, with quality similar to CairoFilter::NEAREST
CairoFilter::GOOD A reasonable-performance filter, with quality similar to CairoFilter::BILINEAR
CairoFilter::BEST The highest-quality available, performance may not be suitable for interactive use.
CairoFilter::NEAREST Nearest-neighbor filtering
CairoFilter::BILINEAR Linear interpolation in two dimensions
CairoFilter::GAUSSIAN This filter value is currently unimplemented, and should not be used in current code.