QTWebEngine on Zynq-7000

Kiyenko

Hi.
I'm trying to run a simple full-screen browser in Linux framebuffer on Zynq-7000. I already manage to do that using QTWebKit, but now I'm trying to do the same with QTWebEngine, as QTWebKit is outdated and does not support the features I want to use.
I found the simplest possible example code:

webengine.pro

TARGET = browser
TEMPLATE = app
SOURCES = main.cpp
QT += qml quick webengine

main.cpp

#include <QtGui/QGuiApplication>
#include <QtQml/QQmlApplicationEngine>
#include <QtWebEngine/qtwebengineglobal.h>

int main(int argc, char *argv[])
{
  QGuiApplication app(argc, argv);
  QtWebEngine::initialize();
  QQmlApplicationEngine appEngine;
  appEngine.load(QUrl("main.qml"));

  return app.exec();
}

main.qml

import QtQuick 2.0
import QtWebEngine 1.0
import QtQuick.Window 2.0

WebEngineView {
  width: Screen.width
  height: Screen.height
  url: 'http://127.0.0.1'
}

After many tries, I found the way to build this application using a modified Docker container from https://github.com/Screenly/Anthias/tree/master/webview. My modification was to use balenalib/zynq-xz702:bookworm as the builder, instead of the image for Raspberry Pi.
I have already installed QT5 packages in this system.

root@arm:/media/sd-mmcblk0p1/pi3# apt list --installed |grep libqt5
libqt5core5a/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5dbus5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5gui5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5network5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5positioning5/oldstable,now 5.15.8+dfsg-3+deb12u1 armhf [installed,automatic]
libqt5printsupport5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5qml5/oldstable,now 5.15.8+dfsg-3 armhf [installed]
libqt5qmlmodels5/oldstable,now 5.15.8+dfsg-3 armhf [installed,automatic]
libqt5quick5/oldstable,now 5.15.8+dfsg-3 armhf [installed]
libqt5quickwidgets5/oldstable,now 5.15.8+dfsg-3 armhf [installed,automatic]
libqt5sensors5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5svg5/oldstable,now 5.15.8-3 armhf [installed,automatic]
libqt5test5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5texttospeech5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5waylandclient5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5waylandcompositor5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5webchannel5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5webengine-data/oldstable,now 5.15.13+dfsg-1~deb12u1 all [installed,automatic]
libqt5webengine5/oldstable,now 5.15.13+dfsg-1~deb12u1 armhf [installed]
libqt5webenginecore5/oldstable,now 5.15.13+dfsg-1~deb12u1 armhf [installed]
libqt5webenginewidgets5/oldstable,now 5.15.13+dfsg-1~deb12u1 armhf [installed]
libqt5webkit5/oldstable,now 5.212.0~alpha4-30 armhf [installed]
libqt5widgets5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]
libqt5x11extras5/oldstable,now 5.15.8-2 armhf [installed,automatic]
libqt5xml5/oldstable,now 5.15.8+dfsg-11+deb12u3 armhf [installed,automatic]

Now, when I try to run application on the target system (Zynq-7000 with Debian 12) I got an error:

QtWebEngine::initialize() called with QCoreApplication object already created and should be call before. This is depreciated and may fail in the future.
This plugin does not support createPlatformOpenGLContext!
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
qt.qpa.input: evdevtouch: Using device /dev/input/event0
qt.qpa.input: evdevtouch: /dev/input/event0: Protocol type B (mtdev) (multi), filtered=no
qt.qpa.input: evdevtouch: /dev/input/event0: min X: 0 max X: 0
qt.qpa.input: evdevtouch: /dev/input/event0: min Y: 0 max Y: 0
qt.qpa.input: evdevtouch: /dev/input/event0: min pressure: 0 max pressure: 4095
qt.qpa.input: evdevtouch: /dev/input/event0: device name: TSC2007 Touchscreen
QQmlApplicationEngine failed to load component
file:///media/sd-mmcblk0p1/pi3/main.qml:3:1: module "QtQuick.Window" is not installed
file:///media/sd-mmcblk0p1/pi3/main.qml:2:1: module "QtWebEngine" is not installed
file:///media/sd-mmcblk0p1/pi3/main.qml:3:1: module "QtQuick.Window" is not installed
file:///media/sd-mmcblk0p1/pi3/main.qml:2:1: module "QtWebEngine" is not installed
Illegal instruction

Looks like I have to configure (or fix) some environment variables, but I'm new to QT and really don't know how to debug this issue.
Please help me make it work.

JonB

@Kiyenko said in QTWebEngine on Zynq-7000:

QtWebEngine::initialize() called with QCoreApplication object already created and should be call before. This is depreciated and may fail in the future.

For this one why not fix? https://doc.qt.io/archives/qt-5.15/qtwebengine.html#initialize tells you

Sets up an OpenGL Context that can be shared between threads. This has to be done before QGuiApplication is created and before window's QPlatformOpenGLContext is created.

so it belongs before QGuiApplication app(argc, argv);.

And maybe same for

Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.

though that may not affect the

This plugin does not support createPlatformOpenGLContext!

and the other complaints.

Kiyenko

Thanks @JonB, now I see fewer warnings

root@arm:/media/sd-mmcblk0p1# ./browser
QStandardPaths: wrong permissions on runtime directory /media/sd-mmcblk0p1/qt_runtime, 0755 instead of 0700
qt.qpa.input: libinput: event0  - TSC2007 Touchscreen: is tagged by udev as: Touchscreen
qt.qpa.input: libinput: event0  - TSC2007 Touchscreen: device is a touch device
qt.qpa.input: libinput: event1  - gpio-keys: is tagged by udev as: Keyboard
qt.qpa.input: libinput: event1  - gpio-keys: device is a keyboard
qt.qpa.input: Using xkbcommon for key mapping
qt.qpa.input: libinput: registerDevice /dev/input/event0 - TSC2007 Touchscreen
This plugin does not support createPlatformOpenGLContext!
qt.qpa.input: evdevtouch: Adding device at /dev/input/event0
qt.qpa.input: evdevtouch: Using device /dev/input/event0
qt.qpa.input: evdevtouch: /dev/input/event0: Protocol type B (mtdev) (multi), filtered=no
qt.qpa.input: evdevtouch: /dev/input/event0: min X: 0 max X: 0
qt.qpa.input: evdevtouch: /dev/input/event0: min Y: 0 max Y: 0
qt.qpa.input: evdevtouch: /dev/input/event0: min pressure: 0 max pressure: 4095
qt.qpa.input: evdevtouch: /dev/input/event0: device name: TSC2007 Touchscreen
QQmlApplicationEngine failed to load component
file:///media/sd-mmcblk0p1/main.qml:3:1: module "QtQuick.Window" is not installed
file:///media/sd-mmcblk0p1/main.qml:2:1: module "QtWebEngine" is not installed
file:///media/sd-mmcblk0p1/main.qml:3:1: module "QtQuick.Window" is not installed
file:///media/sd-mmcblk0p1/main.qml:2:1: module "QtWebEngine" is not installed
Illegal instruction

but the main problem is still here