1Gtk2::Gdk::Pixbuf::DrawU:s:eCracChoen(t3r)ibuted Perl DoGctukm2e:n:tGadtki:o:nPixbuf::Draw::Cache(3)
2
3
4

NAME

6       Gtk2::Gdk::Pixbuf::Draw::Cache -  Cache for drawing scaled pixbufs
7

DESCRIPTION

9       Gtk2::Gdk::Pixbuf::Draw::Cache provides a cache that should be used by
10       the Gtk2::ImageView::Tool when redrawing the Gtk2::ImageView.
11

HIERARCHY

13         Glib::Boxed
14         +----Gtk2::Gdk::Pixbuf::Draw::Cache
15

METHODS

17   cache = Gtk2::Gdk::Pixbuf::Draw::Cache->new
18       Returns a new pixbuf draw cache.
19
20   $cache->draw ($opts, $drawable)
21       •   $opts (Gtk2::Gdk::Pixbuf::Draw::Opts)
22
23       •   $drawable (Gtk2::Gdk::Drawable)
24
25       Redraws the area specified in the pixbuf draw options in an efficient
26       way by using caching.
27
28       cache : a GdkPixbufDrawCache
29       opts : the Gtk2::Gdk::Pixbuf::Draw::Opts to use in this draw
30       drawable : a GdkDrawable to draw on
31
32   $cache->free
33       Deallocates a pixbuf draw cache and all its data.
34
35   $cache->invalidate
36       Force the pixbuf draw cache to scale the pixbuf at the next draw.
37
38       Gtk2::Gdk::Pixbuf::Draw::Cache tries to minimize the number of scale
39       operations needed by caching the last drawn pixbuf. It would be
40       inefficient to check the individual pixels inside the pixbuf so it
41       assumes that if the memory address of the pixbuf has not changed, then
42       the cache is good to use.
43
44       However, when the image data is modified, this assumtion breaks, which
45       is why this method must be used to tell draw cache about it.
46
47   method = Gtk2::Gdk::Pixbuf::Draw::Cache->get_method ($old, $new)
48       •   $old (Gtk2::Gdk::Pixbuf::Draw::Opts)
49
50       •   $new (Gtk2::Gdk::Pixbuf::Draw::Opts)
51
52       Gets the fastest method to draw the specified draw options. old is
53       assumed to be the last PixbufDrawOpts used and new is the one to use
54       this time.
55

ENUMS AND FLAGS

57   enum Gtk2::Gdk::Pixbuf::Draw::Method
58       •   'scale' / 'GDK_PIXBUF_DRAW_METHOD_SCALE'
59
60       •   'contains' / 'GDK_PIXBUF_DRAW_METHOD_CONTAINS'
61
62       •   'scroll' / 'GDK_PIXBUF_DRAW_METHOD_SCROLL'
63

SEE ALSO

65       Gtk2::ImageView, Glib::Boxed
66

68       Copyright (C) 2007 by Jeffrey Ratcliffe.
69
70       This software is licensed under the GPL-3; see Gtk2::ImageView for a
71       full notice.
72
73
74
75perl v5.32.1                      2021-01-27 Gtk2::Gdk::Pixbuf::Draw::Cache(3)
Impressum