Re: Gtk2::Image Loading a png from scalar

[Dov Grobgeld <dov grobgeld weizmann ac il>]

If these libraries can create uncompressed image data, then you can
create an image without going to disk through the
Gtk2::Gdk::Pixbuf->new_from_data function. I'm using it e.g. to
directly display piddles (Perl Data Language structures). Here 
is what I do:

    my($w,$h) = ($rgb->dims)[1,2];
    $rgb->make_physical;
    my $img = Gtk2::Gdk::Pixbuf->new_from_data(${$rgb->get_dataref},
                                              "rgb",
                                              0, 8,
                                              $w,$h, $w*3);

The $rgb->get_dataref call returns (a reference to) a scalar
containing the RGB values.

The pixbuf is then easily placed in an Gtk::Image .

There doesn't seem to be a way of doing the same with compressed
png data though...

Regards,
Dov

On Tue, Aug 03, 2004 at 12:13:39PM -0400, William B Carlson wrote:
> I have a library (GD::Graph, GD::Dashboard, etc) that can create an image 
> and put it in scalar reference.  It can also make a physical file on the 
> file system which I can load in with 
> Gtk2::Image->new_from_file("file.png"). 
> What I want to know is if there is a way to take the scalar
> ( my $image = $dash->png() ) that the library can produce and load that 
> into the application without having to write the file to the file system 
> and read it again. 
>
> Thanks for your time, 
>
> Ben Carlson 
>
>
>
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