[Interest] Problem with QPixmap using framebuffer with omapfb. Works with qt 4.x, but dosn’t work using qt 5.x

[Georg.Brand at fmc-ag.com]

Hello

As 'SGaist' from qt-project Forum suggested, I will send this Problem to 
this Mailing List:

------------------------------------
Hello
The subject describes the Problem.
Platform is a Debian armel Linux (Wheezy). Using omapfb as display driver 
to the framebuffer.
Hardware is an AM3517.
This code:
—————————— 8< ————————————— 
QPixmap image = QPixmap(“resources/images/foo.png”);
 ui->label->setPixmap(image); // label is of type QLabel
—————————— 8< —————————————
works without any problems with qt 4.8.4 [1]. No matter if i use 
./app -qws (for using linuxfb) 
or 
./app -qws -display directfb (for using directfb [3])
The same code dosen’ t work with qt 5.1.12 nor qt 5.2.0 using directfb.
A call to
./app -platform directfb
doesn’t show the picture. 
A call to
./app -platform linuxfb
shows the picture, but has really bad Performance.
I tried to break it down in the qt’s directfb code. As far as i can see, 
directfb is used to render the png using directfb’s plugin 
‘libidirectfbimageprovider_png.so’. But then there is no call to display 
it on the screen…
As a side node: If i use a css file like this
—————————— 8< —————————————
QRadioButton::indicator::unchecked { 
image: url(resources/images/radiobutton_unchecked.png);
}
—————————— 8< —————————————
the image is rendered using directfb and displayed on the widget.
Does anyone has any hints how to solve this problem?
Bye
Georg
[1]
./configure -v -release -embedded arm -confirm-license -prefix 
/opt/qt-embedded-4.8.4-arm -opensource -shared -no-fast -no-qt3support 
-plugin-sql-sqlite -no-audio-backend -no-javascript-jit -platform 
linux-g++ -xplatform qws/linux-arm-gnueabi-g++ -qt-zlib -qt-libtiff 
-qt-libpng -qt-libmng -qt-libjpeg -no-cups -separate-debug-info -no-dbus 
-little-endian -qt-gfx-directfb -force-pkg-config -openssl -nomake 
examples
[2]
./configure -separate-debug-info -opensource -confirm-license -prefix 
/opt/qt-embedded-5.1.1-arm -no-javascript-jit -no-qml-debug -qt-zlib 
-qt-libpng -qt-libjpeg -qt-xkbcommon -no-cups -no-dbus -xplatform 
linux-arm-gnueabi-g++ -force-pkg-config -directfb -qt-xcb
[3]
system=fbdev
mode=800×600
depth=32
disable-module=ps2mouse
disable-module=keyboard
disable-module=linux_input
graphics-vt
no-vt
no-vt-switching
------------------------------------

Mit freundlichen Grüßen

Georg Brand
Dipl. Informatiker

Fresenius Medical Care Deutschland GmbH
Hafenstraße 9 
97424 Schweinfurt, Germany
T +49 9721 678 673
Georg.Brand at fmc-ag.com
www.fmc-ag.com


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