[Bug 58234] New: Region of xvideo window shifted a couple of pixels when another window is above it

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58234

          Priority: medium
            Bug ID: 58234
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Region of xvideo window shifted a couple of pixels
                    when another window is above it
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: joris.guisson at esaturnus.com
          Hardware: Other
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

Created attachment 71434
  --> https://bugs.freedesktop.org/attachment.cgi?id=71434&action=edit
screenshot showing the problem

We are using xvideo to display video on an AMD T40E cpu with a radeon HD 6250
GPU builtin. 

When we display one XVideo window fullscreen, no problem everything shows fine.
However when we try to show a second smaller xvideo window above the first
window (picture in picture), we can see that the horizontal region in the first
window where the second window is located, is shifted a couple of pixels. 

This creates a tearing like effect, but it is not tearing. The moment you hide
the PIP window the effect is gone. The amount of shifting seems to vary, the
further away from the PIP window, the less it gets.

See the attached picture where the effect is highlighted by a rectangle. 

Note that the PIP does not have to be using xvideo, we also get the effect when
just showing some basic X application above the xvideo window. 

We also use other hardware with an intel GPU and CPU, and it does not
experience from this problem. So our own display software doesn't seem to be
the culprit. There is nothing fancy or experimental we do to display the video,
just using shared memory and XvShmPutImage.

That is why I'm thinking it is radeon driver issue. 

The software running on the hardware is debian wheezy with xorg version 7.7,
the radeon driver version 6.14.4 and a 3.2.33 linux kernel. XVideo is using a
textured video port.

This is the output of xvinfo:
X-Video Extension version 2.2
screen #0
  Adaptor #0: "Radeon Textured Video"
    number of ports: 16
    port base: 63
    operations supported: PutImage 
    supported visuals:
      depth 24, visualID 0x21
    number of attributes: 7
      "XV_VSYNC" (range 0 to 1)
              client settable attribute
              client gettable attribute (current value is 1)
      "XV_BRIGHTNESS" (range -1000 to 1000)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_CONTRAST" (range -1000 to 1000)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_SATURATION" (range -1000 to 1000)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_HUE" (range -1000 to 1000)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_COLORSPACE" (range 0 to 1)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_CRTC" (range -1 to 5)
              client settable attribute
              client gettable attribute (current value is -1)
    maximum XvImage size: 16384 x 16384
    Number of image formats: 4
      id: 0x32595559 (YUY2)
        guid: 59555932-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x32315659 (YV12)
        guid: 59563132-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x30323449 (I420)
        guid: 49343230-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x59565955 (UYVY)
        guid: 55595659-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)

Doing some googling, I found this redhat bugreport, which describes the same
problem:

https://bugzilla.redhat.com/show_bug.cgi?id=583382

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