Qt embedded
Qt4 is an application framework by Nokia [1]. It can be used in combination with the PyQt4 python bindings [2]. There is an alternative python binding PySide [3]. Qt has a embedded variant, which only uses the framebuffer. This is especially handy for embedded applications.
Goal of this page is to create a minimal python + qt linux setup using Qt embedded.
Step 1: build qt embedded
$ tar -xzf qt-everywhere-opensource-src-4.7.4.tar.gz $ cd qt-everywhere-opensource-src-4.7.4 $ ./configure -embedded -no-qt3support -opensource -prefix /usr $ make $ sudo make install
Note that this can take some time, so grab a coffee or so :). I made the following bash script and timed it on a 1.8 GHz duo core:
#!/bin/bash echo "Extracting.." tar xzf qt-everywhere-opensource-src-4.7.4.tar.gz > /dev/null DIR=qt-everywhere-opensource-src-4.7.4 cd $DIR echo "Configuring" echo "yes" | ./configure -no-qt3support -no-phonon -embedded -opensource -prefix /usr echo "Building" make -j2 > /dev/null echo "Done"
Saving this script as buildAll.sh and running it:
$ time ./buildAll.sh ... real 79m21.881s user 136m13.454s sys 12m26.338s
To check the behavior of a test application, start your pc in framebuffer mode and start a test application:
$ cd demos/textedit $ ./textedit -qws
The -qws option is required to enable a sort of replacement for the X-server.
To check that we are indeed using the embedded version of Qt, run ldd to check the libraries that are used by the program:
$ ldd textedit
linux-vdso.so.1 => (0x00007fff2ba7c000)
libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x00007f3989c30000)
libQtNetwork.so.4 => /usr/lib/libQtNetwork.so.4 (0x00007f3989921000)
libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x00007f398944f000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007f3989232000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f3988f27000)
libm.so.6 => /lib/libm.so.6 (0x00007f3988ca5000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f3988a8f000)
libc.so.6 => /lib/libc.so.6 (0x00007f398872f000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007f3988516000)
libdl.so.2 => /lib/libdl.so.2 (0x00007f3988312000)
librt.so.1 => /lib/librt.so.1 (0x00007f398810a000)
/lib/ld-linux-x86-64.so.2 (0x00007f398a8b8000)
As you can see, there is no Xorg related library linked to the executable.
To be continued...