PHP Manual
Cairo
The CairoFilter class

The CairoFilter class

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简介

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.

类摘要

CairoFilter {

/* 常量 */

const integer FAST = 0 ;

const integer GOOD = 1 ;

const integer BEST = 2 ;

const integer NEAREST = 3 ;

const integer BILINEAR = 4 ;

const integer GAUSSIAN = 5 ;

}

预定义常量

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.