Re: Pixbuf to Cairo and vice versa

[Torsten Schoenfeld <kaffeetisch gmx de>]

On 13.07.2011 15:41, Mario Kemper wrote:
> 3) Show the final image in a widget, i.e. convert the cairo surface back to a pixbuf
>
> #write surface to pixbuf
> my $loader = Gtk2::Gdk::PixbufLoader->new;
> $surface->write_to_png_stream(
>         sub {
>                 my ( $closure, $data ) = @_;
>                 $loader->write($data);
>         }
> );
> $loader->close;
>
> <<<  use $loader->get_pixbuf somewhere>>>

Maybe this approach is faster: 
<http://lethalman.blogspot.com/2009/04/create-pixbuf-from-cairo-surface.html>?

Alternatively, if all you want is to display the altered image, then you 
could write a custom widget that uses the gdk and cairo integration 
stuff to draw the surface.  Like described here: 
<http://gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28>, 
or as is done here: 
<http://api.metacpan.org/source/TSCH/Gtk2-1.224/examples/cairo-rendering.pl>. 
 Use Cairo::set_source_surface to copy your surface into the widget's 
surface.