[Bug 754107] New: compositor: Inputs are "obscured" when they aren't

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754107

            Bug ID: 754107
           Summary: compositor: Inputs are "obscured" when they aren't
    Classification: Platform
           Product: GStreamer
           Version: 1.5.90
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jan.steffens at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

compositor 1.5.90 determines inputs are obscured when they are in fact
disjoint.

GST_DEBUG=compositor:DEBUG gst-launch-1.0 videotestsrc ! comp.sink_0
videotestsrc ! comp.sink_1 compositor name=comp sink_0::width=640
sink_0::height=360 sink_1::width=640 sink_1::height=360 sink_1::xpos=640
sink_1::ypos=360 sink_1::zorder=0 ! video/x-raw,width=1280,height=720 !
autovideosink

I've augmented the debug message with the frame rect values:

compositor.c:494:gst_compositor_pad_prepare_frame:<comp:sink_1> (640+0,360+0)
obscured by sink_0 (0+640,0+360), skipping frame

Seems the size of sink_1 isn't being calculated properly, ending up as 0x0.

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