Hi Monali,
Mona wrote:
Hi all,
I am working on porting openoffice ( version 2.3.1) applications ( writer,
calc, impress) to work with DirectFb on Unix platform . I am new to large
code base of OOo . It would really be very helpful if you validate my
understanding on the following .
Let's see ...
1) OOo has GTK plugin. However since the GTK plugin is now based on
X11Classes which are based on Sal Classes ,
I would need to replace all the low level X calls in these X11 classes into
equivalent GDK calls .
I am looking at approach where i have the GtkPlugin classes still deriving
from X11 classes . However if OOo code is configured for DirectFB backend (
maybe a --enable-directfb) i would change the X11 classes to talk to GDK
rather than X. Am i right here ?
Sounds correct, Philipp likely has more to say. I may be more
appropriate to just create a new VCL backend.
2)Since there is VCL layer for all graphics, i assume that all above
applications will be ported to directFB backend if i port the VCL GTK
Plugin to DirectFb backend . Is this so simple ?
Should be.
2.b) Has someone tried something similar with OOo?
You mean porting it to directFB? I don't think so, but it has a least
been ported to
- X11
- Win32
- Max OS X / Cocoa
- Java AWT (NeoOfficeJ)
2.c) How much effort would be involved in this activity ?
Doing the basic porting of VCL should be doable in months ...
3) I also assume that i would need no changes in the UNO layer and awt
toolkit . I am interested in using writer , calc and impress packages to act
as viewers i.e support for read-only . Would i need to port layers other
than VCL that also talk to X e.g dtrans.
Depends, dtrans deals with clipboard and D&D, don't know if these are in
principle available while using directFB.
4) I have NOT understood how the sw, sc and sd modules interact with the
framework layer (svx,sfx). Where do i find details of these framework
modules. I have read this -
http://www.openoffice.org/white_papers/tech_overview/tech_overview.html#3*
You may want to start further reading in the Wiki:
http://wiki.services.openoffice.org/wiki/Framework
or in the dev. guide:
http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/OfficeDev/Office_Development
5) What are the graphics calls at the application layer ? Below the
application layer is Framework,Infrastructure and SAL layer.
Graphics calls are done directly calling VCL or in newer code calling
the XCanvas (which supports e.g. DirectX etc., but also as a VCL
back-end again).
Which layer maps graphic calls from OOo appliucations (like sw) calls to the
VCL layer ?
AFAIK, this is either done directly or through framework or SVX.
6) Is there any way to incrementally test this approach ?
Starting to port VCL should be sufficient, there are also some test
applications in vcl/workbench, which should give you are first
understanding of what needs to be done.
7) Is there any simple application that follow the same approach as
writer(sw) and which can be used to test the flow of from application layer
through framework layer to VCL layer. I have seen few demo applications in
vcl/workben. Any more suggestions ?
The framework people may give some more hints where they have "hidden"
their test applications ... :-)
Regards,
Monali.
What's the motivation behind you project? Obviously you would like to
run OOo on X11 free systems, which are AFAIK mostly small appliances
like set-top-boxes etc. Are we going to see a set-top-box with OOo
installed? Or are you targeting small devices?
Regards
Kay
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