Re: display 16bit-image

[Bob Caryl <bob fis-cal com>]

Andreas Schropp wrote:

> Hi,
>
> I am desperately looking for a suitable method using
> gtkmm in order to display 16 bit data (grey-valued) on the screen.
> I want to refresh that image in certain moments by a mouse click
> or any other timer-signal.
> Until now, I tried it with the "gdkmm/pixbuf.h"-class using its
> "create_from_data(...)-method, but until now everything failed.
>
> Thanx a lot in advance
> Andreas
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Hello Andreas,

If you want to display your image from inline data you will want to use 
the gdk-pixbuf-csource utility found in /opt/gnome/bin to create a C 
source file you can include in your source code.  Once that is done you 
need to include the following in your derived window class:

   Glib::RefPtr<Gdk::Pixbuf> image;

Then, in the constructor for your derived window class you need to have 
this line:

   image = Gdk::Pixbuf::create_from_inline(-1,<pointer to your inline 
image data>,FALSE);

Then, in your overridden on_expose_event function, you will want this code:

   Glib::RefPtr<Gdk::Pixbuf> tmpimage = 
image->scale_simple(get_width(),get_height(),Gdk::INTERP_BILINEAR);
   tmpimage->render_to_drawable(get_window(), 
get_style()->get_white_gc(),   
       0, 0, 0, 0, get_width(), get_height(),Gdk::RGB_DITHER_NONE, 0, 0);

The foregoing code scales the image pixbuf you created in the 
constructor to the current size of your window.  Of course, you can use 
that same code in a mouse event as well to re-render the image.

I hope this helps a bit.

Bob Caryl