[Gtk-sharp-list] Getting frames from a GIF animation

[Gustavo Rubio]

Doug,

You might want to check the GDK namespace (GIMP Drawing Kit) and not GTK
itself, there is the concept of Pixbuf in GDK (which would be the
equivalent of GDI+ for Windows) that allows you to work on images.

There is a PixbufAnimationIter (
http://docs.go-mono.com/?link=T%3aGdk.PixbufAnimationIter) class that might
come handy, as I understand you'd have to create a new Gdk.PixbufAnimation
object and then get the Iter by inviking a method and then get the frames:

var animation = new Gdk.PixbufAnimation("path_to.gif");
var iter = animation.GetIter(start_time);
var pixbuf = iter.Pixbuf; //assign the frame
iter.Advance(time); //advance to next frame
var pixbuf2 = iter.Pixbuf; //here you'll get the second frame

I haven't tried yet this, but I'm pretty sure this is what you are after.
Let me know if it worked.


On Wed, Apr 10, 2013 at 6:58 PM, Doug Blank <doug.blank at gmail.com> wrote:

> I couldn't figure out how to access the data through Gtk#, so I got
> the data through System.Drawing:
>
> public static List loadPictures (string filename)
> {
>    List list = new List();
>    System.Drawing.Bitmap image =
> (System.Drawing.Bitmap)System.Drawing.Bitmap.FromFile(filename);
>    System.Drawing.Imaging.FrameDimension dimension = new
>
> System.Drawing.Imaging.FrameDimension(image.FrameDimensionsList[0]);
>    int frame_count = image.GetFrameCount(dimension);
>    for (int i=0; i < frame_count; i++) {
>       image.SelectActiveFrame(dimension, i);
>       list.append( new Graphics.Picture(image));
>    }
>    return list;
> }
>
> -Doug
>
> On Wed, Apr 10, 2013 at 1:41 PM, Doug Blank <doug.blank at gmail.com> wrote:
> > Gtk-sharp List,
> >
> > I can use the Gtk# interface to get the frames of a gif animation
> > based on time, like the following IronPython code shows:
> >
> > image = Gtk.Image(filename)
> > if image.Animation:
> >     if not image.Animation.IsStaticImage:
> >         iter = image.Animation.GetIter(System.IntPtr.Zero)
> >         while iter.DelayTime > -1:
> >             pixbuf = iter.Pixbuf
> >             ## do something with pixbuf
> >             iter.Advance(System.IntPtr.Zero) ## advance to current time
> >
> > But, can I actually get the actual individual *frames* from the gif
> > file? That is, I can use this interface to step through time getting
> > the appropriate image for the specified time, but if an animated gif
> > has 7 gifs in it, is there a direct way to just get the 7 pixbufs?
> >
> > Thanks for any pointers,
> >
> > -Doug
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>



-- 
*Gustavo Rubio*
MX: (664) 608-0659
US: (619) 502-9192
http://42ideas.mx
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