[Bug 757292] New: gdkpixbufoverlay: relative-x/y properties

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757292

            Bug ID: 757292
           Summary: gdkpixbufoverlay: relative-x/y properties
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 314373
  --> https://bugzilla.gnome.org/attachment.cgi?id=314373&action=edit
image that show the problem

please test this pipeline using the provide png

videotestsrc ! gdkpixbufoverlay location=/tmp/pipeline.png overlay-width=200
overlay-height=120 relative-x=0.1 relative-y=0.1 ! xvimagesink

the logs says something like this:

0:00:00.128700446  4858      0x10040a0 DEBUG       gdkpixbufoverlay
gstgdkpixbufoverlay.c:588:gst_gdk_pixbuf_overlay_update_composition:<gdkpixbufoverlay0>
overlay rendered: 200 x 120 @ 494,66 (onto 320 x 240)

and no overlay is rendered

changing 

overlay->offset_x + (overlay->relative_x * overlay_meta->width);

with 

overlay->offset_x + (overlay->relative_x * video_width);

here:

http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/ext/gdk_pixbuf/gstgdkpixbufoverlay.c#n569

and doing the same for the y 

this log is showed

0:00:00.143735692  4866       0xc930a0 DEBUG       gdkpixbufoverlay
gstgdkpixbufoverlay.c:591:gst_gdk_pixbuf_overlay_update_composition:<gdkpixbufoverlay0>
overlay rendered: 200 x 120 @ 32,24 (onto 320 x 240)

and the overlay is rendered as expected,

I'm not sure if I have correctly understand how these properties are supposed
to work

please advise if you want a patch or update the docs to be more clear,

thanks

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