Re: export GdkPixmap to graphics file?

[Richard Boaz <riboaz xs4all nl>]

hi,

as you note, you can indeed convert the pixmap to a pixbuf using the  
following:

GdkPixbuf *pixbuf = gdk_pixbuf_get_from_drawable(NULL, pixmap, NULL,  
0, 0, 0, 0, -1, -1);

since a pixmap is a drawable.

richard

On Dec 27, 2006, at 12:10 AM, David L wrote:

> > gdk_pixbuf_save (pixbuf, save_filename, "png", &error, NULL);
> >
> > For more detail see:
> >
> > http://developer.gimp.org/api/2.0/gdk-pixbuf/gdk-pixbuf-file- 
> > saving.html
>
> Dov,
>
> Thanks for the response.  That looks something like what I'm looking
> for.  The reason that I didn't find that documentation was that I  
> was looking
> for a function that worked on a GdkPixmap... the documentation that  
> you
> showed me was for GkkPixbuf.
>
> http://developer.gimp.org/api/2.0/gdk-pixbuf/gdk-pixbuf-file- 
> saving.html
> vs
> http://developer.gnome.org/doc/API/gdk/gdk-bitmaps-and- 
> pixmaps.html#GDKPIXMAP
>
> I don't yet know the difference between gdkpixmap and gdkpixbuf, but
> presumably there is a conversion function between the two.?  Neither
> page I'm looking at mentions the other.
>
> Somebody on the cairo list gave me another potential solution to my
> problem.  I can get a cairo_surface_t from a cairo_t by calling:
>
> cairo_surface_t* cairo_get_target           (cairo_t *cr);
>
> and then call:
> cairo_status_t cairo_surface_write_to_png   (cairo_surface_t *surface,
>                                             const char *filename);
>
> I haven't tried this yet, but since I'm using cairo to create the  
> gdkpixmap,
> this will probably work for me.  However, the function you pointed  
> me to
> would be more general because it doesn't require cairo.  For the sake
> of somebody who googles this thread someday, can somebody post
> how to convert between GdkPixbuf and GdkPixmap?  I found this
> function:
>
> GdkPixbuf *gdk_pixbuf_get_from_drawable(GdkPixbuf *dest,
>    GdkDrawable *src, GdkColormap *cmap, int src_x, int src_y,
>    int dest_x, int dest_y, int width, int height);
>
> Is that how one would convert from a GdkPixmap to a GdkPixbuf?
>
> Thanks,
>
>            David
>
>
> >
>
>
> > Regards,
> > Dov
> >
> > On 12/15/06, David L <idht4n hotmail com> wrote:
> > > Hi,
> > >
> > > I'm using cairo to create a GdkPixmap that I display in a
> > > gtk drawing area.  I'd like to create a graphics file with the
> > > content of the pixbuf when I click on the drawing area.  Is
> > > there a simple function to create some kind of graphics
> > > file from a GdkPixmap?  I've thought of just drawing
> > > everything twice, once into the pixmap and once into a
> > > cairo_surface_t structure and then using cairo's surface
> > > to file export functions to create the file, but that seems
> > > pretty wasteful because I'd be drawing every object twice.
> > > So is there any function that I can call like this:
> > >
> > > GdkPixmapWriteToPng(GdkPixmap *,
> > >                                              const char *filename);
> > >
> > > Thanks...
> > >
> > >             David
> > >
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