Added some notes on the Nano-X port.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14359 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart
parent
461e93f921
commit
0fccf28fe6
201
docs/x11/readme-nanox.txt
Normal file
201
docs/x11/readme-nanox.txt
Normal file
@ -0,0 +1,201 @@
|
||||
Nano-X port
|
||||
===========
|
||||
|
||||
What is it?
|
||||
===========
|
||||
|
||||
The Nano-X port is based on the wxX11 code, and therefore shares
|
||||
almost all of wxX11's code, including the use of the wxUniversal
|
||||
widget set. Nano-X is the X-like API of the overall Microwindows
|
||||
project, which also has a WIN32 API.
|
||||
|
||||
The Microwindows web site is at
|
||||
|
||||
http://microwindows.org/
|
||||
|
||||
Nano-X is intended to work on devices with very small amounts
|
||||
of memory. wxWindows is quite a large library, so if your
|
||||
memory is measured in KB instead of MB you will need to use
|
||||
an alternative library, such as FLTK. However, with memory
|
||||
capacity increasing all the time, wxWindows could become
|
||||
an appropriate embedded GUI solution for many projects.
|
||||
Also, it's possible to think of ways to cut wxWindows
|
||||
further down to size, such as disabling advanced controls
|
||||
or rewriting utility functions. See the section on code size
|
||||
below.
|
||||
|
||||
An alternative to using Nano-X is to use the standard
|
||||
wxX11 port with Tiny-X, which (as I understand it)
|
||||
maintains the Xlib API while being sufficiently cut
|
||||
down to run on small devices, such as the iPAQ.
|
||||
The Familiar Linux Distribution contains Tiny-X. See:
|
||||
|
||||
http://handhelds.org/mailman/listinfo/familiar
|
||||
|
||||
Building wxNano-X
|
||||
=================
|
||||
|
||||
Building is as per the instructions for wxX11 (see readme.txt,
|
||||
install.txt) but passing --enable-nanox to configure. You also need
|
||||
to export the MICROWIN variable, setting it to the top-level of the
|
||||
Microwindows hierarchy. Remember that MICROWIN needs to be defined
|
||||
both at configuration time and at subsequent make time, so you
|
||||
may find it convenient to put it in your .bash_profile or similar
|
||||
file.
|
||||
|
||||
Typically, various features in wxWindows will be switched off to
|
||||
conserve space. The sample script below calls configure with typical
|
||||
options for Nano-X.
|
||||
|
||||
Before compiling wxNano-X, you will also need to edit your
|
||||
Microwindows 'config' file to match the values hard-coded into
|
||||
configure:
|
||||
|
||||
ERASEMOVE=N (otherwise moving windows will look messy)
|
||||
X11=Y
|
||||
OPTIMIZE=N
|
||||
DEBUG=Y
|
||||
VERBOSE=Y
|
||||
|
||||
Compile Microwindows by typing 'make' from within the Microwindows src
|
||||
directory.
|
||||
|
||||
Port notes
|
||||
==========
|
||||
|
||||
Nano-X has a different API from Xlib, although there
|
||||
are many similarities. Instead of changing the wxWindows
|
||||
code to reflect Nano-X conventions, a compatibility
|
||||
layer has been added, in the form of these files:
|
||||
|
||||
include/wx/x11/nanox/X11/Xlib.h ; Xlib compatibility
|
||||
include/wx/x11/privx.h ; Useful macros
|
||||
src/x11/nanox.c ; Xlib compatibility
|
||||
|
||||
There is also an XtoNX.h compatibility header file
|
||||
in Microwindows, which we augment with our Xlib.h
|
||||
and nanox.c.
|
||||
|
||||
Unfortunately it is not always possible, or economical,
|
||||
to provide a complete Xlib emulation, so there are
|
||||
still wxUSE_NANOX preprocessor directives in the code
|
||||
for awkward cases. It may be possible to eliminate
|
||||
some, but probably not all, of these in future.
|
||||
|
||||
Port Status
|
||||
===========
|
||||
|
||||
The port is in a very early stage: so far it links
|
||||
and a window pops up, but that's about it. (The
|
||||
wxX11 port using straight X11 is much more advanced.)
|
||||
|
||||
Things to do:
|
||||
|
||||
- implement some incomplete compatibility functions
|
||||
in src/x11/nanox.c
|
||||
- implement the colour database
|
||||
- add mask capability, without which controls won't
|
||||
display properly
|
||||
- add further configuration options for disabling
|
||||
code not normally needed in an embedded device
|
||||
- optimization and code size reduction
|
||||
- figuring out why libstdc++-libc is linked to
|
||||
binaries -- is this done for any C++ program?
|
||||
|
||||
Code Size
|
||||
=========
|
||||
|
||||
Allow about 2.5 MB for a shared wxWindows library, with the
|
||||
dynamically linked minimal sample taking about 24KB. If statically
|
||||
linked, minimal takes up just over 1MB when stripped. This 1MB
|
||||
includes all of wxWindows used in the minimal sample including some of
|
||||
the wxUniversal widgets. As application complexity increases,
|
||||
the amount of wxWindows code pulled into statically linked
|
||||
executables increases, but for large applications, the overhead
|
||||
of wxWindows becomes less significant.
|
||||
|
||||
Sample sizes:
|
||||
-------------
|
||||
|
||||
Statically-linked minimal (release): 1,024,272 bytes
|
||||
Statically-linked widgets (release): 1,171,568 bytes
|
||||
|
||||
Shared lib, stripped (debug): 2,486,716 bytes
|
||||
Shared-lib minimal (debug), stripped: 23,896 bytes
|
||||
|
||||
Shared lib, stripped (release): 2,315,5004 bytes
|
||||
Shared-lib minimal (release), stripped: 23,896 bytes
|
||||
(note: the -O flag was not passed to the minimal
|
||||
makefile, for some reason)
|
||||
|
||||
Strategies for reducing code size
|
||||
---------------------------------
|
||||
|
||||
- Look at the .o files compiled in a build and check
|
||||
for particularly large files, or files you wouldn't
|
||||
expect to be there in an embedded build.
|
||||
- Disable options for features that aren't necessary,
|
||||
for example: image handlers (BMP, JPEG etc.),
|
||||
wxVariant, wxWizard, wxListCtrl, src/univ/themes/gtk.c.
|
||||
- Add options to configure.in/setup.h where necessary,
|
||||
for finer-grained configuration.
|
||||
- Rewrite functions or classes for alternative stripped-down
|
||||
functionality.
|
||||
- Remove unnecessary functionality or obsolete code from
|
||||
wxWindows.
|
||||
- Factor out wxWindows code to reduce repetition.
|
||||
- Add inlining, remove unnecessary empty functions.
|
||||
- Separate code out into individual files so that all of
|
||||
a .o file doesn't get pulled in, just because an app
|
||||
references something else in that file. For example,
|
||||
advanced event types could be separated out.
|
||||
This assumes that the linker isn't clever enough to
|
||||
eliminate redundant functions. The fact that the
|
||||
minimal and widgets samples are very close in size
|
||||
is evidence that gcc is not doing a good job here.
|
||||
- Experiment with compiler options.
|
||||
- Commercially supported compilers may have better
|
||||
code generation and/or linker optimisation than the
|
||||
one you're currently using.
|
||||
|
||||
Sample script for building wxNano-X
|
||||
===================================
|
||||
|
||||
This script assumes that you will invoke it
|
||||
from a build directory under the wxWindows
|
||||
top level. So you might type:
|
||||
|
||||
% cd wx2
|
||||
% mkdir nano-x
|
||||
% cd nano-x
|
||||
% makewxnanox
|
||||
|
||||
If you need to restart compilation without
|
||||
reconfiguring, just type 'make' from the same
|
||||
directory.
|
||||
|
||||
-----------------------------:x----------------------
|
||||
|
||||
#!/bin/sh
|
||||
# makewxnanox
|
||||
|
||||
export MICROWIN=/home/julians/microwindows/microwindows-0.89pre8
|
||||
|
||||
#DEBUGFLAGS="--enable-debug --enable-debug_cntxt --disable-optimise"
|
||||
DEBUGFLAGS="--disable-debug --disable-debug_cntxt --enable-optimise"
|
||||
|
||||
export CONFIGCMD="./configure $DEBUGFLAGS --enable-shared --enable-gui --with-x11 --enable-nanox --enable-log --with-threads --without-sockets --without-odbc --without-libjpeg --without-libtiff --without-png --without-regex --enable-no_exceptions --disable-protocols --disable-ipc --disable-dialupman --disable-apple_ieee --disable-fraction --disable-dynlib --disable-dynamicloader --disable-geometry --disable-fontmap --disable-std_iostreams --disable-filesystem --disable-fs_inet --disable-fs_zip --disable-zipstream --disable-snglinst --disable-mimetype --disable-url --disable-html --disable-constraints --disable-printarch --disable-mdi --disable-postscript --disable-PS-normalized --disable-afmfonts --disable-prologio --disable-resources --disable-dnd --disable-metafile --disable-treelayout --disable-grid --disable-propsheet --disable-splines --disable-joystick --disable-pcx --disable-iff --disable-pnm --disable-tabdialog --disable-newgrid"
|
||||
|
||||
echo $CONFIGCMD
|
||||
if [ ! -f ./configure ]; then
|
||||
CONFIGCMD=".$CONFIGCMD"
|
||||
fi
|
||||
|
||||
echo Invoking $CONFIGCMD
|
||||
|
||||
rm -f *.cache
|
||||
$CONFIGCMD
|
||||
|
||||
make
|
||||
|
||||
-----------------------------:x----------------------
|
||||
Loading…
Reference in New Issue
Block a user