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# The CairoFilter class

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## Introduction

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.

## Class synopsis

CairoFilter {
/* Constants */
const integer FAST = 0 ;
const integer GOOD = 1 ;
const integer BEST = 2 ;
const integer NEAREST = 3 ;
const integer BILINEAR = 4 ;
const integer GAUSSIAN = 5 ;
}

## Predefined Constants

`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.

CairoFillRule
CairoHintMetrics
Cairo
PHP Manual