Hello,
I'm currently writing a Composite Manager with XCB as an university
project[0]. I'm using a library for EWMH[1] I have written and which
has not been committed yet to xcb-util because it is not finished yet.
I read xcompmgr code along with the extensions specifications to figure
out how all these extensions interacts together. At the moment, I'm not
writing the code from a performance point of view, so I'm just trying to
stick to the minimum features and especially to make it work.
However, I have the following problems and I really can't figure out
what's wrong (the main code is in render.c for Render related functions,
window.c and event.c):
1/ When receiving a DestroyNotify event, I use DamageDestroy on the
previously created damage object but I get a BadDamage error whereas
it is the same damage object identifier from its creation to the
DamageDestroy request.
2/ I don't have any problem when starting the Composite Manager when
windows already exist (e.g. existing are correctly painted on the
screen), but it does not work when trying to paint new window on the
screen (I don't get any error though). Basically, my code does the
following:
1) Initialization (working fine):
a) RenderCreatePicture with the root window identifier and with
SubwindowMode equals to IncludeInferiors and assigned to global
variable globalconf.root_picture.
b) Get the root background pixmap, if there is none, create a new
pixmap of 1x1 pixels, then RenderCreatePicture with Repeat
equals to true, then fill it with RenderFillRectangles, and
assigned to a global variable
globalconf.root_background_picture.
c) RenderComposite from b) to a).
2) When a CreateNotify event is received:
a) DamageCreate on the new window identifier.
3) When a MapNotify event is received:
a) Set the map state to Viewable.
b) Get the window pixmap with CompositeNameWindowPixmap.
4) When a DamageNotify is received:
a) Set the window as damaged.
5) Paint all the windows:
a) RenderComposite from 1b) to 1a) in order to repaint the screen.
b) RenderCreatePicture on the pixmap 3b).
c) RenderComposite from b) to 1a).
Is there anything wrong in these requests? I think I may have not
understood an important concept but I can't figure out which one. I
have not used XFixes for now because I don't really know when to use
it because as far as I have understood, XFixes would avoid useless
copy of pixels. I'm also a bit confused about DamageSubtract too and
don't know exactly when it would be useful (for handling opacity?).
Thank you very much in advance for your answers.
Regards,
Arnaud Fontaine
[0] http://git.mini-dweeb.org/?p=arnau/pcompmgr.git;a=summary
[1] http://git.mini-dweeb.org/?p=arnau/xcb-util.git;a=summary
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