PutImage vs BackgroundPixmap (was Re: Open Shared Memory and Render Pictures)

Michael Titke michael.tiedtke at o2online.de
Sat Aug 6 11:54:22 UTC 2016

With SHM pixmaps VSI/GIO can finally display a pixmap. While the Intel 
graphics card of my old MacBook might not be that speed daemon I'm a 
little bit surprised to see "jumpy" window resizes. Perceived 
performance is important and sometimes just plainly misleading but both 
ShmPutImage (with expose event round trips) as well as a background 
pixmap (with deselected expose events and without any round trip) lead 
to the same perceived performance where the window border takes its time 
to follow the pointer and starts to jump to reach it faster.
The "jumpiness" reminds me of mutex saturation effects or maybe this is 
due to the compositing of some part of the Ubuntu Unity Desktop shell 
collection? The complexities of the modern input output graph ...

On 05/08/2016 18:58, Dennis Clarke wrote:
> On 08/05/2016 12:38 PM, Ilya Anfimov wrote:
>> X Window Sys-
>> tem Protocol X Consortium Standard.
> For those that want to know :
>     X Window System Protocol X Consortium Standard.
>     https://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.pdf
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