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The CairoOperator class

Introdução

This is used to set the compositing operator for all cairo drawing operations.

The default operator is CairoOperator::OVER

The operators marked as unbounded modify their destination even outside of the mask layer (that is, their effect is not bound by the mask layer). However, their effect can still be limited by way of clipping.

To keep things simple, the operator descriptions here document the behavior for when both source and destination are either fully transparent or fully opaque. The actual implementation works for translucent layers too. For a more detailed explanation of the effects of each operator, including the mathematical definitions, see http://cairographics.org/operators/.

Sinopse da classe

CairoOperator

CairoOperator {

/* Constants */

const integer CairoOperator::CLEAR = 0 ;

const integer CairoOperator::SOURCE = 1 ;

const integer CairoOperator::OVER = 2 ;

const integer CairoOperator::IN = 3 ;

const integer CairoOperator::OUT = 4 ;

const integer CairoOperator::ATOP = 5 ;

const integer CairoOperator::DEST = 6 ;

const integer CairoOperator::DEST_OVER = 7 ;

const integer CairoOperator::DEST_IN = 8 ;

const integer CairoOperator::DEST_OUT = 9 ;

const integer CairoOperator::DEST_ATOP = 10 ;

const integer CairoOperator::XOR = 11 ;

const integer CairoOperator::ADD = 12 ;

const integer CairoOperator::SATURATE = 13 ;

}

Constantes pré-definidas

CairoOperator Node Types

CairoOperator::CLEAR: Clear destination layer (bounded)
CairoOperator::SOURCE: Replace destination layer (bounded)
CairoOperator::OVER: Draw source layer on top of destination layer (bounded)
CairoOperator::IN: Draw source where there was destination content (unbounded)
CairoOperator::OUT: Draw source where there was no destination content (unbounded)
CairoOperator::ATOP: Draw source on top of destination content and only there
CairoOperator::DEST: Ignore the source
CairoOperator::DEST_OVER: Draw destination on top of source
CairoOperator::DEST_IN: Leave destination only where there was source content (unbounded)
CairoOperator::DEST_OUT: Leave destination only where there was no source content
CairoOperator::DEST_ATOP: Leave destination on top of source content and only there (unbounded)
CairoOperator::XOR: Source and destination are shown where there is only one of them
CairoOperator::ADD: Source and destination layers are accumulated
CairoOperator::SATURATE: Like CairoOperator::OVER, but assuming source and dest are disjoint geometries

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Você está em: The CairoOperator class

The CairoOperator class

Introdução

Sinopse da classe

Constantes pré-definidas

CairoOperator Node Types