Re: Image missdisplayed using GdkPixmap

["Sebastien Roy" <morgan sebastien gmail com>]

On 9/24/06, Jim George <jimgeorge gmail com> wrote:
> On 9/24/06, Sebastien Roy <morgan sebastien gmail com> wrote:
> > Image is not well written ...
> > lines seems to be mixed ... Alignement is incorrect ..
> > I suppose this is due to a wrong usage of dithering/depth parameters ...
> > data is pointing to a rgb buffer ...
> > the same call was working fine when writing directly to a windows
> instead of
> > a newly created
> > pixmap.
> > Image may not be loaded from a file as it is received from network,
> that's
> > while it's stored in a buffer.
> >
> > cnx->pixmap is a GtkPixmap*
> > cnx->window is a TOPLEVEL window GtkWidget*
> >
> >
> >    1.   cnx->pixmap = gdk_pixmap_new(0, cnx->data.header.width,
> >    2.                                cnx->data.header.height, 16);
> >    3.
> >    4.
> >    5.   gdk_draw_rgb_image(cnx->pixmap,
> >    6.                      cnx->window->style->fg_gc[GTK_STATE_NORMAL],
> >    7.                      0, 0,
> >    8.                      cnx->data.header.width,
> >    9.                      cnx->data.header.height,
> >    10.                      GDK_RGB_DITHER_NORMAL, cnx->data.data,
> >    11.                      cnx->data.header.width * 3);
> >    12.
> >    13.   cnx->draw_area = gtk_image_new_from_pixmap(cnx->pixmap, NULL);
> >
> >
> > libgtk2.0-dev  2.8.20-1
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> >
>
> If the goal is to create an offscreen buffer to later be blitted to a
> window, you can modify line 1 & 2 to read
>
>     1.   cnx->pixmap = gdk_pixmap_new(GDK_DRAWABLE(cnx->window->window),
>     2.                                cnx->data.header.width,
> cnx->data.header.height, -1);
>
> PS, this also shows that cnx->window is a confusing name, perhaps
> cnx->widget would work better.
>
> -Jim
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> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list


Thanks for your help.
This is was part of the problem :)
I had also a cnx->window->window which was null, because window was just
created and not realized :)

--
Sebastien