Re: GC sometimes without a colormap

[Ari Jolma <ari jolma tkk fi>]

David Nečas (Yeti) kirjoitti:
> On Tue, Feb 13, 2007 at 01:38:29PM +0200, Ari Jolma wrote:
>   
> > $pm = Gtk2::Gdk::Pixmap->new(undef,10,10,24);
> > $gc = new Gtk2::Gdk::GC $pm;
> > $gc->set_rgb_fg_color(Gtk2::Gdk::Color->new(0,0,0));
> > $pm->draw_rectangle($gc,1,0,0,10,10);
> > $pb = Gtk2::Gdk::Pixbuf->get_from_drawable($pm,undef,0,0,0,0,10,10);
> >
> > The idea is to create small (10x10) pixbufs with varying colors for 
> > inserting them into the model of a treeview.
> >     
>
> Why you don't just create the pixbufs and fill them with the
> required color (which can be done with gdk_pixbuf_fill() or
> with Cairo if you want more complex drawing), and go through
> pixmaps that use server-side resource... instead?
>   

So those five lines become just two:

$pb = Gtk2::Gdk::Pixbuf->new('rgb', 0, 24, 10, 10);
$pb->fill($color[0] << 24 | $color[1] << 16 | $color[2] << 8);

which seems to work in my normal environment. I can't just now test the 
Windows environment where the previous solution failed but I'm hopeful.

Hey, while I'm asking. I have another pixbuf question. I've been 
creating a canvas in C (simple malloced buffer), from which I've then 
made a gdk pixbuf with gdk_pixbuf_new_from_data. I have used on the 
canvas my own drawing routines. Now I'd like to use also Cairo besides 
my own. It should work somehow like this, I assume:

I malloc my canvas
I create an image surface for data (my canvas)
I create a context for this surface
Now I can draw on this canvas with Cairo and with my own routines
I proceed as before with gdk_pixbuf_new_from_data

Should this work? My initial tests in Perl according these lines do not 
work.

Thanks,

Ari

> It's also possible to create just one pixbuf and fill it
> with the corresponding color in the cell data function of
> the tree view.
>
> Yeti
>
>
> --
> Whatever.
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>   


--
Prof. Ari Jolma
Geoinformaatio- ja paikannustekniikka
Geoinformation and positioning technology
Teknillinen Korkeakoulu / Helsinki University of Technology
POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma