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<p class="MsoNormal">Hello Pritima,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One possible explanation from my site: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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</v:shape><![endif]--><![if !vml]><span style="mso-ignore:vglayout;position:absolute;z-index:251659264;margin-left:84px;margin-top:17px;width:232px;height:56px"><img width="232" height="56" style="width:2.4166in;height:.5833in" src="cid:image001.png@01DA8B4D.9D8A7350" v:shapes="Rectangle_x0020_6"></span><![endif]>For
me it looks like the buffer you send to compositor has a content below<o:p></o:p></p>
<p class="MsoNormal"><img width="313" height="49" style="width:3.2604in;height:.5104in" id="_x0000_i1029" src="cid:image005.png@01DA8B4D.0BE59970"><o:p></o:p></p>
<p class="MsoNormal">And the red area has some alpha value which is wrongly interpreted by the display unit during the composition.<o:p></o:p></p>
<p class="MsoNormal">If GPU composition is enforced the GPU can interpret the values correctly and provide expected results..<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> wayland-devel <wayland-devel-bounces@lists.freedesktop.org>
<b>On Behalf Of </b>Pritama Biswas (QUIC)<br>
<b>Sent:</b> Monday, April 8, 2024 3:31 PM<br>
<b>To:</b> wayland-devel@lists.freedesktop.org<br>
<b>Cc:</b> Namit Solanki (QUIC) <quic_nsolanki@quicinc.com><br>
<b>Subject:</b> RE: Corruption seen in GPU composed output<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Team,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please find the comparison between working and non-working use-cases.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Issue case: When status bar and camera layer are GPU composed and video layer is composed by Display Processing Unit.
<o:p></o:p></p>
<p class="MsoNormal"><img width="307" height="183" style="width:3.1979in;height:1.9062in" id="Picture_x0020_3" src="cid:image006.png@01DA8B4D.0BE59970">
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Working case: When all layers are sent to gl-renderer for GPU composition.<o:p></o:p></p>
<p class="MsoNormal"><img width="307" height="173" style="width:3.1979in;height:1.802in" id="Picture_x0020_5" src="cid:image007.jpg@01DA8B4D.0BE59970" alt="A person posing for a picture
Description automatically generated"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks and Regards,<o:p></o:p></p>
<p class="MsoNormal">Pritama Biswas<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Pritama Biswas (QUIC) <br>
<b>Sent:</b> Monday, April 8, 2024 6:28 PM<br>
<b>To:</b> 'wayland-devel@lists.freedesktop.org' <<a href="mailto:wayland-devel@lists.freedesktop.org">wayland-devel@lists.freedesktop.org</a>><br>
<b>Cc:</b> Namit Solanki (QUIC) <<a href="mailto:quic_nsolanki@quicinc.com">quic_nsolanki@quicinc.com</a>><br>
<b>Subject:</b> Corruption seen in GPU composed output<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Hi Weston team,<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are seeing corruption when running video playback in fullscreen (1080p) + camera in non-fullscreen mode (480x270) in Weston 10.<o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="463" height="264" style="width:4.8229in;height:2.75in" id="Picture_x0020_1" src="cid:image008.jpg@01DA8B4D.0BE59970" alt="A person standing in front of a painting
Description automatically generated"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here, the status bar and the camera layer is sent for GPU composition via gl-renderer and the video layer is sent to Display processing unit for composition.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We took layer buffer dump for GPU composer layer and confirmed that the GPU composed output is corrupted as shown below:<o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="466" height="229" style="width:4.8541in;height:2.3854in" id="Picture_x0020_2" src="cid:image009.png@01DA8B4D.0BE59970"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When we force all the layers (camera + Video + Status bar) to go to GPU composition, issue is not seen.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any pointers to debug or fix this issue will be helpful.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks and Regards,<o:p></o:p></p>
<p class="MsoNormal">Pritama Biswas<o:p></o:p></p>
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