[Bug 754576] New: [REGRESSION] compositor: In particular cases an input stream are wrongly concidered obscured

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754576

            Bug ID: 754576
           Summary: [REGRESSION] compositor: In particular cases an input
                    stream are wrongly concidered obscured
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Since:

> commit 9b59bb8630c8574da2a3b0db9c5cc530e7daa535
> Author: Nirbheek Chauhan <nirbheek at centricular.com>
> Date:   Wed Aug 26 15:40:16 2015 +0530

>     compositor: Actually use the output resolution for clamping

>     The obscured check in compositor was using the dimensions of the pad to clamp
>     the h/w of the pad instead of the output resolution, and was doing an incorrect
>     calculation to do so. Fix that by simplifying the whole calculation by using
>     corner coordinates. Also add a test for this bug which fell through the cracks,
>     and just skip all the obscured tests if the pad's alpha is 0.0.  
>     https://bugzilla.gnome.org/show_bug.cgi?id=754107


that pipeline:

$ gst-launch-1.0 uridecodebin
uri=file://$HOME/gst-validate/gst-integration-testsuites/medias/defaults/matroska/numerated_frames_blue.mkv
! compositor sink_0::xpos=-1 ! video/x-raw,height=240,width=319 ! autovideosink

Outputs a 'checker' instead of outputing the frame with a x-position=-1

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