NAME
X11::XCB::Rect - represents a rectangle
SYNOPSIS
my $rect = X11::XCB::Rect->new(x => 0, y => 0, width => 300, height => 400);
But in most cases, you should be able to coerce a rect from an arrayref:
my $window = $x->root->create_child(
rect => [0, 0, 300, 300],
class => WINDOW_CLASS_INPUT_OUTPUT,
);