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Establishes a new clip region from the current clip


CairoContext::clipPreserve

cairo_clip_preserve

(PECL cairo >= 0.1.0)

CairoContext::clipPreserve -- cairo_clip_preserveEstablishes a new clip region from the current clip

Description

Object oriented style (method):

public void CairoContext::clipPreserve ( void )

Procedural style:

void cairo_clip_preserve ( CairoContext $context )

Establishes a new clip region by intersecting the current clip region with the current path as it would be filled by Context.fill() and according to the current FILL RULE (see CairoContext::setFillRule() or cairo_set_fill_rule()).

Unlike CairoContext::clip(), CairoContext::clipPreserve() preserves the path within the Context. The current clip region affects all drawing operations by effectively masking out any changes to the surface that are outside the current clip region.

Calling CairoContext::clipPreserve() can only make the clip region smaller, never larger. But the current clip is part of the graphics state, so a temporary restriction of the clip region can be achieved by calling CairoContext::clipPreserve() within a CairoContext::save()/CairoContext::restore() pair. The only other means of increasing the size of the clip region is CairoContext::resetClip().

Parameters

context

A valid CairoContext object

Return Values

No value is returned.

Examples

Example #1 Object oriented style

<?php

$surface 
= new CairoImageSurface(CairoFormat::ARGB325050);

$context = new CairoContext($surface);

$context->clipPreserve();

?>

Example #2 Procedural style

<?php

$surface 
cairo_image_surface_create(CAIRO_FORMAT_ARGB325050);

$context cairo_create($surface);

cairo_clip_preserve($context);

?>

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