#!/usr/bin/perl
use strict;
use warnings;
use Gtk2 '-init';
use LWP::Simple;
# cheap webget, no error reporting
if( ! -e 'earth.jpg' and ! -e 'moon.jpg'){
print "downloading test images, please wait\n";
foreach my $localfile('earth.jpg','moon.jpg'){
mirror( "http://zentara.net/$localfile", $localfile );
}
}
my $mw = Gtk2::Window->new;
$mw->signal_connect('destroy', sub { Gtk2->main_quit });
my $vp = Gtk2::Viewport->new(undef, undef);
$mw->add($vp);
my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file_at_scale ('earth.jpg', 6
+00,600,0);
my $pixbufa = $pixbuf->copy();
#my ($x, $y) = ($pixbufa->get_width, $pixbufa->get_height);
#print "$x $y\n";
my $pixbuf1 = Gtk2::Gdk::Pixbuf->new_from_file_at_scale ('moon.jpg', 6
+00,600,0);
my $pixbufb = $pixbuf1->copy();
#my ($x1, $y1) = ($pixbufb->get_width, $pixbufb->get_height);
#print "$x1 $y1\n";
#$pixbuf1->composite ($pixbuf, $dest_x, $dest_y, $dest_width, $dest_he
+ight,
# $offset_x, $offset_y, $scale_x, $scale_y, $interp_type, $overa
+ll_alpha)
# start with base image
my $toggle = 5;
my $alpha = 0;
$pixbufb->composite ($pixbufa, 0, 0, 600, 600,
0, 0, 1, 1, 'nearest', $alpha); # 0 <= alpha <= 255
my $image = Gtk2::Image->new_from_pixbuf ($pixbufa);
$vp->add($image);
$mw->set_title("fade demo");
$mw->show_all();
my $id = Glib::Timeout->add (100, \&sequence);
Gtk2->main;
sub sequence{
$alpha += $toggle;
print "$alpha\n";
if ($alpha == 255){ $toggle = -5 }
if ($alpha == 0){ $toggle = 5 }
$pixbufb->composite ($pixbufa, 0, 0, 600, 600,
0, 0, 1, 1, 'nearest', $alpha); # 0 <= alpha <= 255
$image->set_from_pixbuf ($pixbufa);
Gtk2->main_iteration while Gtk2->events_pending;
# prevents accumulation of pixbuf changes
$pixbufa = $pixbuf->copy();
return 1;
}
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