[Bug 761251] New: textoverlay: Expose text rendering dimensions to applications and remove absolute positioning limit

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761251

            Bug ID: 761251
           Summary: textoverlay: Expose text rendering dimensions to
                    applications and remove absolute positioning limit
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lubosz at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 319937
  --> https://bugzilla.gnome.org/attachment.cgi?id=319937&action=edit
textoverlay: Do not limit positioning to video area.

These two patches allows applications like Pitivi to modify the text position
in a visual editor.

The first patch removes the limit of the posx / posy parameters be inside the
video canvas. If the feature of the "snap to border" behavior is required, it
should be exposed in another alignment mode. "position" should be the absolute
position without limits.

The second patch allows to acquire the rendering dimensions (x, y, width,
height) of the pango text, so hover listeners can be implemented.

Related Pitivi issue: https://phabricator.freedesktop.org/T3523

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