Cannot rotate my touchscreen with QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS, using linuxfb plugin
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Hello everyone !
I'm presently working on an I.MX6 device, with a NHD‐4.3‐480272MF display (including a touchscreen).
I built Qt5.5 in order to make a suitable app for my target, with this configuration:./configure -release -v -directfb -no-xkbcommon-evdev -no-xcb-xlib -no-sse2 -no-glib -no-pulseaudio -no-alsa -gtkstyle -linuxfb -no-iconv -evdev -no-libjpeg -plugin-sql-sqlite -no-dbus -no-libproxy -no-sql-mysql -no-sql-ibase -no-sql-oci -no-sql-odbc -no-sql-tds -no-xkbcommon-evdev -no-icu -no-fontconfig -opensource -confirm-license -no-pch -no-xcb -opengl es2 -make libs -make examples -device imx6 -compile-examples -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /home/swuser/Appli/Prj/_bsp_imx6_linux/buildroot/buildroot-2015.08.1/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot -no-gcc-sysroot -prefix /usr/lib/qt
(I kept Directfb and Eglfs plugins, because i wanted to try them. They didn't wok for me)
For now on, I'm having difficulties with the display and touchscreen orientations (both in landscape, and not in portrait as I wished) with linuxfb plugin.
I found a patch working for display rotation on this site: http://borkedlabs.com/2015/06/01/qt5-linuxfb-rotation-for-lcds/ , but it doesn't apply for touchscreen rotation.
I tried to set the environment variable QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS with "rotate=angle"
but it didn't work for me. I'm presently spiking qt source code to understand where my mistake could be.here is my environment configuration:
export QT_DEBUG_PLUGINS=1
export QT_PLUGIN_PATH=/usr/lib/plugins
export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/plugins/platforms
export QT_QPA_PLATFORM=linuxfb
export QT_QPA_GENERIC_PLUGINS=tslib:/dev/input/event0
export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event0:rotate=270
export TSLIB_TSEVENTTYPE='INPUT'and i launch my app sending the command:
./myapp -platform linuxfb:fb=/dev/fb0:rotation=angleIf anyone could give me some insight on what I have done wrong, i would be very pleased.
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Hi again guys !
I've resolved my problem:
Initially, I made a mistake mixing up Tslib and Evdevtouch plugins. Even though Evdevtouch seems more suitable for my application (a rotation plugin is already coded), I just can't make it work: when i used it, events were happening, but actions (such as buttons) were not even triggered.
So I decided to use Tslib plugin (it already worked for me), and i applied a patch to it, in order to be able to rotate the touchscreen as I wanted. The only thing needed is to export a environment variable with the suitable parameters:export TSLIB_PARAMETERS=mode=heightxwidth:rotate=anglewhere height and width represent the format of your display, and angle, the rotation for the touchscreen (can only be set to values: 0, 90, 180, 270)
an example of application could be:
export TSLIB_PARAMETERS=mode=480x272:rotate=270 export QT_QPA_GENERIC_PLUGINS=tslib:/dev/input/event0 export QT_QPA_FB_TSLIB=1 ./name_of_app -platform linuxfb:fb=/dev/fb0:rotation=270As i cannot join attached files, i post the patch here. But feel free to contact me if you want more info.
--- qtslib.cpp 2016-06-07 14:39:05.664970271 +0200 +++ ./qt5/qtbase/src/platformsupport/input/tslib/qtslib.cpp 2016-06-07 14:43:39.899464647 +0200 @@ -35,6 +35,8 @@ #include <QSocketNotifier> #include <QStringList> +#include <QString> +#include <QPointF> #include <QPoint> #include <QLoggingCategory> @@ -102,6 +104,30 @@ void QTsLibMouseHandler::readMouseData() { ts_sample sample; + QString spec = QString::fromLocal8Bit(qgetenv("TSLIB_PARAMETERS")); + int RotateAngle; + int Width; + int Height; + QString ModeArg; + + if(spec.isEmpty()){ + RotateAngle = 0; + Height = 480; + Width = 272; + } + + QStringList args = spec.split(QLatin1Char(':')); + for (int i = 0; i < args.count(); ++i) { + if(args.at(i).startsWith(QLatin1String("rotate"))) { + QString rotateArg = args.at(i).section(QLatin1Char('='), 1, 1); + RotateAngle = rotateArg.toInt(); + } + else if(args.at(i).startsWith(QLatin1String("mode"))) { + ModeArg = args.at(i).section(QLatin1Char('='), 1, 1); + Width = ModeArg.section(QLatin1Char('x'),0,0).toInt(); + Height= ModeArg.section(QLatin1Char('x'),1,1).toInt(); + } + } while (get_sample(m_dev, &sample, m_rawMode)) { bool pressed = sample.pressure; @@ -121,8 +147,29 @@ if (dx*dx <= 4 && dy*dy <= 4 && pressed == m_pressed) continue; } - QPoint pos(x, y); - + QPoint pos(x,y); + //Switch to apply rotation + switch (RotateAngle) { + case 0: + pos.setX(x); + pos.setY(y); + break; + case 90: + pos.setX(y); + pos.setY(Width-x); + break; + case 180: + pos.setX(Width-x); + pos.setY(Height-y); + break; + case 270: + pos.setX(Height-y); + pos.setY(x); + break; + default: + break; + } + QWindowSystemInterface::handleMouseEvent(0, pos, pos, pressed ? Qt::LeftButton : Qt::NoButton); m_x = x;
