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

[Doug Blank]

On Wed, Apr 10, 2013 at 10:22 PM, Gustavo Rubio <gustavo at 42ideas.mx> wrote:
> 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.

No, that is where I started (see last example below). That requires
that you step through the animations "in time". You can march through
the frames in a manner by making the Advance() time match the
DelayTime. But you won't know when you are looping.

Thanks anyway,

-Doug

>
> 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