bionic (3) Gtk2::Gdk::Pixbuf::Draw::Cache.3pm.gz

Provided by: libgtk2-imageview-perl_0.05-2build4_amd64 bug

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)
       •   $opts (Gtk2::Gdk::Pixbuf::Draw::Opts)

       •   $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)
       •   $old (Gtk2::Gdk::Pixbuf::Draw::Opts)

       •   $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
       •   'scale' / 'GDK_PIXBUF_DRAW_METHOD_SCALE'

       •   'contains' / 'GDK_PIXBUF_DRAW_METHOD_CONTAINS'

       •   'scroll' / 'GDK_PIXBUF_DRAW_METHOD_SCROLL'


SEE ALSO
       Gtk2::ImageView, Glib::Boxed


       Copyright (C) 2007 by Jeffrey Ratcliffe.

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