<div dir="ltr">Thanks a lot. I understand how the Opaque window is composited. But as to the translucency window, it starts composite from the first translucent window (the first translucent when searching from top to bottom), then to the top.   But if there are any other translucent windows between 

first translucent window and the bottom window, should this be considered?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Olivier Fourdan <<a href="mailto:ofourdan@redhat.com">ofourdan@redhat.com</a>> 于2020年7月10日周五 下午5:12写道：<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,</div><div><br></div><div>It actually renders the screen in two passes.</div><div><br></div><div>First pass from top to bottom, rendering only the opaque regions, while adding up each opaque region to a global clipping region.<br></div><div><br></div><div>Second pass, from bottom to top, rendering only the translucent areas, clipping out the opaque regions that it found in the first pass.</div><div><br></div><div>That's more efficient than rendering in a single pass from bottom to top.<br></div><div><br></div><div>FWIW, the logic is from xcompmgr, from Keith.</div><div><br></div><div>Cheers</div><div>Olivier</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 10, 2020 at 11:06 AM 徐星 <<a href="mailto:openxu@gmail.com" target="_blank">openxu@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><br clear="all"><div><p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Hi, </p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Do you have any ideas why matchbox window manager render
clients from top(near) to  bottom(far)?  I understand that the
painter algorithm requires paints from far  to near.</p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> </p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><a href="https://git.yoctoproject.org/cgit/cgit.cgi/matchbox-window-manager-2/tree/matchbox/comp-mgr/mb-wm-comp-mgr-xrender.c#n1619" style="color:rgb(5,99,193)" target="_blank">https://git.yoctoproject.org/cgit/cgit.cgi/matchbox-window-manager-2/tree/matchbox/comp-mgr/mb-wm-comp-mgr-xrender.c#n1619</a></p></div>-- <br><div dir="ltr">NaCl!<br></div></div>
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