Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
Gtk2::Gdk::Pixbuf::DraUseraContributed Perl DGtk2::Gdk::Pixbuf::Draw::Cache(3)

NAME
       Gtk2::Gdk::Pixbuf::Draw::Cache -	 Cache for drawing scaled pixbufs

DESCRIPTION
       Gtk2::Gdk::Pixbuf::Draw::Cache provides a cache that should be used by
       the Gtk2::ImageView::Tool when redrawing	the Gtk2::ImageView.

HIERARCHY
	 Glib::Boxed
	 +----Gtk2::Gdk::Pixbuf::Draw::Cache

METHODS
   cache = Gtk2::Gdk::Pixbuf::Draw::Cache->new
       Returns a new pixbuf draw cache.

   $cache->draw	($opts,	$drawable)
       o   $opts (Gtk2::Gdk::Pixbuf::Draw::Opts)

       o   $drawable (Gtk2::Gdk::Drawable)

       Redraws the area	specified in the pixbuf	draw options in	an efficient
       way by using caching.

       cache : a GdkPixbufDrawCache
       opts : the Gtk2::Gdk::Pixbuf::Draw::Opts	to use in this draw
       drawable	: a GdkDrawable	to draw	on

   $cache->free
       Deallocates a pixbuf draw cache and all its data.

   $cache->invalidate
       Force the pixbuf	draw cache to scale the	pixbuf at the next draw.

       Gtk2::Gdk::Pixbuf::Draw::Cache tries to minimize	the number of scale
       operations needed by caching the	last drawn pixbuf. It would be
       inefficient to check the	individual pixels inside the pixbuf so it
       assumes that if the memory address of the pixbuf	has not	changed, then
       the cache is good to use.

       However,	when the image data is modified, this assumtion	breaks,	which
       is why this method must be used to tell draw cache about	it.

   method = Gtk2::Gdk::Pixbuf::Draw::Cache->get_method ($old, $new)
       o   $old	(Gtk2::Gdk::Pixbuf::Draw::Opts)

       o   $new	(Gtk2::Gdk::Pixbuf::Draw::Opts)

       Gets the	fastest	method to draw the specified draw options. old is
       assumed to be the last PixbufDrawOpts used and new is the one to	use
       this time.

ENUMS AND FLAGS
   enum	Gtk2::Gdk::Pixbuf::Draw::Method
       o   'scale' / 'GDK_PIXBUF_DRAW_METHOD_SCALE'

       o   'contains' /	'GDK_PIXBUF_DRAW_METHOD_CONTAINS'

       o   'scroll' / 'GDK_PIXBUF_DRAW_METHOD_SCROLL'

SEE ALSO
       Gtk2::ImageView,	Glib::Boxed

COPYRIGHT
       Copyright (C) 2007 by Jeffrey Ratcliffe.

       This software is	licensed under the GPL-3; see Gtk2::ImageView for a
       full notice.

perl v5.32.1			  2022-09-06 Gtk2::Gdk::Pixbuf::Draw::Cache(3)

NAME | DESCRIPTION | HIERARCHY | METHODS | ENUMS AND FLAGS | SEE ALSO | COPYRIGHT

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Gtk2::Gdk::Pixbuf::Draw::Cache&sektion=3&manpath=FreeBSD+13.1-RELEASE+and+Ports>

home | help