Re: Cannot access gdkpixbuf?

["S. Wittenberg" <wittenb informatik uni-freiburg de>]

Hubert Figuiere wrote:
> On 04/17/2009 02:16 AM, S. Wittenberg wrote:
> > I tried to access the wrapped gdkpixbuf inside the Gdk::Pixbuf, but i
> > get this, even if i #include the right header file (just to be sure):
> >
> > connection.cpp: In member function ‘Glib::RefPtr<Gdk::Pixbuf>
> > Connection::getBuffer()’:
> > connection.cpp:336: error: invalid use of incomplete type ‘struct
> > _GdkPixbuf’
> > /usr/include/gtk-2.0/gdk-pixbuf/gdk-pixbuf-core.h:55: error: forward
> > declaration of ‘struct _GdkPixbuf’
> >
> > My code looks like this:
> >
> > frame_buffer = Gdk::Pixbuf::create_from_data(....);
> > frame_buffer->gobj()->n_channels = 4;
>
>
> GdkPixbuf is an opaque structure. You are not able to access its 
> fields directly.
>
>
> Hub

Thanks for your answer.

Let me rephrase my request:

I got a framebuffer thats RGBA, but otherwise compliant to the requests 
of the pixbuf.
The gdkpixbuf seems to be capable of utilizing RGBA, while the 
Gdk::Pixbuf isnt...
Even if i set has_alpha to true, it wont work... in fact, if i do this, 
it wont work at all.
So i have to strip the buffer from the alpha channel, but thats quite 
expensive and necessary
many times per second since i display various vnc-displays. If i could 
access the gdkpixbuf
directly, just place my buffer there and set the corresponding fields, i 
could save some
calculations.

Is there any intelligent and reasonable solution to this?