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  4. How to write custom screen driver using Qt 5.8 without using framebuffer?
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How to write custom screen driver using Qt 5.8 without using framebuffer?

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  • A Avanish Singh

    For Development of QPA plugin using Qt 5.8 following basic classed are needed:

    1. QPlatformIntegartionPlugin:
      * Entry point for the plugin
      * Factory Class
      *QPlatformIntegration creates it by calling the createPlatformWindow method. It doesn’t care
      for the contents of the window.
    2. QPlatformScreen:
      This class represents your visual/physical displays ( i.e. monitors ).
      3)QPlatformWindow :
      *This class provides an abstraction used by QWindow for all it’s top-level windows.
      • Interface to the windowing system
      • It's about the window, not about the surface or content
    3. QPlatformBackingStore :
      • A handler for painting and flushing
      • It's about the surface or content, not the window(inner portion of the window)
    4. QPixmapData:
      • Stores pixmap data.
    5. QPlatformFontDatabase:
      • Interface to your platform fontdatabase.
      • Create and returns QFontEngine.
    N Offline
    N Offline
    nlazovic
    wrote on last edited by nlazovic
    #5

    [0_1512394999226_main.cpp](Uploading 100%) @Avanish-Singh @SGaist
    I tried doing similar (BTW using QT5.9) and QPlatformBackingStore instance is just never being invoked. We also tried minimalegl plugin (one that comes with QT source) and same issue "QPlatformBackingStore instance is just never being invoked"
    Any ideas why ?

    sample app
    main.cpp

    #include <QQmlApplicationEngine>
#include <QDir>
#include <QGuiApplication>
#include <QQmlEngine>
#include <QQmlFileSelector>
#include <QQuickView> 

int main(int argc, char *argv[])
{

    QGuiApplication::setAttribute(Qt::AA_ShareOpenGLContexts, true);
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:///demos/hw2/main.qml")));

    return app.exec();
}

    main.qml

    import QtQuick 2.5
import QtQuick.Window 2.2
import QtMultimedia 5.5

Window {
    id: w
    visible: true
    visibility: Window.FullScreen
    color: "#000000";	//default bkg color is black

	Rectangle {
		id: r1
		x: 100; y: 100
		width: 400; height: 200
		color: "#646464"

		Text {
			anchors.centerIn: parent
			text: "Hello, World1!"
		}

	}
	
	Rectangle {
		id: r2
		x: 600; y: 100
		width: 400; height: 200
		color: "#646464"

		Text {
			anchors.centerIn: parent
			text: "Hello, World2!"
		}

	}	
	VideoOutput {
    id: diVideo
	x: 400; y: 400
	width: 400; height: 200
    source: mediaPlayer
	
		MediaPlayer {
			id: mediaPlayer
			autoLoad: true
			source: "file:///root/Downloads/movies/SampleVideo_1280x720_20mb.mp4"
		}	   
		
        Component.onCompleted: {
			mediaPlayer.play();
		}		
	}	
	
}
    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #6

      Hi,

      You don't give enough details. What platform are you on ? How are you starting your application ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      N 1 Reply Last reply
      0
      • SGaistS SGaist

        Hi,

        You don't give enough details. What platform are you on ? How are you starting your application ?

        N Offline
        N Offline
        nlazovic
        wrote on last edited by nlazovic
        #7

        @SGaist
        I built QT 5.9.3 for Odroid XU4.
        When I start my app with "./myapp -platform eglfs" all renders ok on attached HDMI monitor.
        When I start my app with "./myapp -platform minimalegl" I see that that no debug logs comes out of (not even from a constructor)

        QMinimalEglBackingStore modified to save to image

        #include "qminimaleglbackingstore.h"

#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLPaintDevice>

QT_BEGIN_NAMESPACE

QMinimalEglBackingStore::QMinimalEglBackingStore(QWindow *window)
    : QPlatformBackingStore(window)
    , m_context(new QOpenGLContext)
    , m_device(0)
{
    qWarning("QMinimalEglBackingStore::QMinimalEglBackingStore", window);
	
    m_context->setFormat(window->requestedFormat());
    m_context->setScreen(window->screen());
    m_context->create();
}

QMinimalEglBackingStore::~QMinimalEglBackingStore()
{
    delete m_context;
}

QPaintDevice *QMinimalEglBackingStore::paintDevice()
{
    return m_device;
}

void QMinimalEglBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
{
    Q_UNUSED(region);
    Q_UNUSED(offset);

    qWarning("QEglBackingStore::flush %p", window);

    static int c = 0;
    //save frame as image
    QOpenGLFramebufferObject fbo(size());
    qDebug()<<"bind success? : "<<fbo.bind();
    QImage frameImage = fbo.toImage();
    QString filename = QString("output%1.png").arg(c++, 4, 10, QLatin1Char('0'));
    qDebug() << "QMinimalEglBackingStore::flush() saving contents to" << filename.toLocal8Bit().constData();
    frameImage.save(filename);

    m_context->swapBuffers(window);
}

void QMinimalEglBackingStore::beginPaint(const QRegion &)
{
    m_context->makeCurrent(window());
    m_device = new QOpenGLPaintDevice(window()->size());
}

void QMinimalEglBackingStore::endPaint()
{
    delete m_device;
}

void QMinimalEglBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
    Q_UNUSED(size);
    Q_UNUSED(staticContents);
}

QT_END_NAMESPACE
        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #8

          Did you modify Qt or wrote your own QPA ?

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          N 1 Reply Last reply
          0
          • SGaistS SGaist

            Did you modify Qt or wrote your own QPA ?

            N Offline
            N Offline
            nlazovic
            wrote on last edited by
            #9

            @SGaist
            no. used minimalegl plugin as it came from QT source code (qtbase/src/plugins/platforms/minimalegl). Just added few debug lines to check calls being made.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #10

              You should set the QT_DEBUG_PLUGINS environment variable to 1 and start your application again to see what happens with it.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

              N 1 Reply Last reply
              1
              • SGaistS SGaist

                You should set the QT_DEBUG_PLUGINS environment variable to 1 and start your application again to see what happens with it.

                N Offline
                N Offline
                nlazovic
                wrote on last edited by
                #11

                @SGaist

                running app with
                export QT_DEBUG_PLUGINS=1
                ./myapp -platform minimalegl

                From log I can only figure out that

                QPlatformBackingStore *QMinimalEglIntegration::createPlatformBackingStore(QWindow *window) const

                is not invoked.

                log

                App started
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libdsccstreamerplatform.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libdsccstreamerplatform.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "dsccstreamerplatform"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": true,
    "version": 329987
}


Got keys from plugin meta data ("dsccstreamerplatform")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libphantom.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libphantom.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "phantom"
        ]
    },
    "className": "PhantomIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("phantom")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqminimalegl.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqvnc.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/local/qt5xu4/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/platforms" ...
loaded library "/usr/local/qt5xu4/plugins/platforms/libqminimalegl.so"
QEglScreen 0x361a8

Opened display 0x37ee8

Initialized display 1 4

	EGL_BUFFER_SIZE: 32
	EGL_ALPHA_SIZE: 8
	EGL_BLUE_SIZE: 8
	EGL_GREEN_SIZE: 8
	EGL_RED_SIZE: 8
	EGL_DEPTH_SIZE: 24
	EGL_STENCIL_SIZE: 8
	EGL_CONFIG_CAVEAT: 12344
	EGL_CONFIG_ID: 3
	EGL_LEVEL: 0
	EGL_MAX_PBUFFER_HEIGHT: 8192
	EGL_MAX_PBUFFER_PIXELS: 67108864
	EGL_MAX_PBUFFER_WIDTH: 8192
	EGL_NATIVE_RENDERABLE: 0
	EGL_NATIVE_VISUAL_ID: 0
	EGL_NATIVE_VISUAL_TYPE: 12344
	EGL_SAMPLES: 0
	EGL_SAMPLE_BUFFERS: 0
	EGL_SURFACE_TYPE: 1031
	EGL_TRANSPARENT_TYPE: 12344
	EGL_TRANSPARENT_BLUE_VALUE: 0
	EGL_TRANSPARENT_GREEN_VALUE: 0
	EGL_TRANSPARENT_RED_VALUE: 0
	EGL_BIND_TO_TEXTURE_RGB: 0
	EGL_BIND_TO_TEXTURE_RGBA: 1
	EGL_MIN_SWAP_INTERVAL: 0
	EGL_MAX_SWAP_INTERVAL: 0
QMinimalEglIntegration

Found metadata in lib /usr/local/qt5xu4/qml/QtQuick.2/libqtquick2plugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "MetaData": {
    },
    "className": "QtQuick2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.2"
    ],
    "version": 329987
}


loaded library "/usr/local/qt5xu4/qml/QtQuick.2/libqtquick2plugin.so"
Found metadata in lib /usr/local/qt5xu4/qml/QtQuick/Window.2/libwindowplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "MetaData": {
    },
    "className": "QtQuick2WindowPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Window.2"
    ],
    "version": 329987
}


loaded library "/usr/local/qt5xu4/qml/QtQuick/Window.2/libwindowplugin.so"
Found metadata in lib /usr/local/qt5xu4/qml/QtMultimedia/libdeclarative_multimedia.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "MetaData": {
    },
    "className": "QMultimediaDeclarativeModule",
    "debug": false,
    "uri": [
        "QtMultimedia"
    ],
    "version": 329987
}


loaded library "/usr/local/qt5xu4/qml/QtMultimedia/libdeclarative_multimedia.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/mediaservice" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/mediaservice/libgstaudiodecoder.so"
Found metadata in lib /usr/local/qt5xu4/plugins/mediaservice/libgstaudiodecoder.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreameraudiodecode"
        ],
        "Services": [
            "org.qt-project.qt.audiodecode"
        ]
    },
    "className": "QGstreamerAudioDecoderServicePlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("gstreameraudiodecode")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/mediaservice/libgstcamerabin.so"
Found metadata in lib /usr/local/qt5xu4/plugins/mediaservice/libgstcamerabin.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamercamerabin"
        ],
        "Services": [
            "org.qt-project.qt.camera"
        ]
    },
    "className": "CameraBinServicePlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("gstreamercamerabin")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/mediaservice/libgstmediacapture.so"
Found metadata in lib /usr/local/qt5xu4/plugins/mediaservice/libgstmediacapture.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediacapture"
        ],
        "Services": [
            "org.qt-project.qt.audiosource"
        ]
    },
    "className": "QGstreamerCaptureServicePlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("gstreamermediacapture")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/mediaservice/libgstmediaplayer.so"
Found metadata in lib /usr/local/qt5xu4/plugins/mediaservice/libgstmediaplayer.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediaplayer"
        ],
        "Services": [
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "className": "QGstreamerPlayerServicePlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/mediaservice" ...
loaded library "/usr/local/qt5xu4/plugins/mediaservice/libgstmediaplayer.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/resourcepolicy" ...
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/resourcepolicy" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/video/declarativevideobackend" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/video/videonode" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/video/videonode/libeglvideonode.so"
Found metadata in lib /usr/local/qt5xu4/plugins/video/videonode/libeglvideonode.so, metadata=
{
    "IID": "org.qt-project.qt.sgvideonodefactory/5.2",
    "MetaData": {
        "Keys": [
            "egl"
        ]
    },
    "className": "QSGVideoNodeFactory_EGL",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("egl")
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/video/videonode" ...
loaded library "/usr/local/qt5xu4/plugins/video/videonode/libeglvideonode.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/video/gstvideorenderer" ...
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/video/gstvideorenderer" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/imageformats" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqgif.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqgif.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "gif"
        ],
        "MimeTypes": [
            "image/gif"
        ]
    },
    "className": "QGifPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("gif")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqicns.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqicns.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "icns"
        ],
        "MimeTypes": [
            "image/x-icns"
        ]
    },
    "className": "QICNSPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("icns")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqico.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqico.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "ico",
            "cur"
        ],
        "MimeTypes": [
            "image/vnd.microsoft.icon"
        ]
    },
    "className": "QICOPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("ico", "cur")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqjpeg.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqjpeg.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "jpg",
            "jpeg"
        ],
        "MimeTypes": [
            "image/jpeg",
            "image/jpeg"
        ]
    },
    "className": "QJpegPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("jpg", "jpeg")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqtga.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqtga.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tga"
        ],
        "MimeTypes": [
            "image/x-tga"
        ]
    },
    "className": "QTgaPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("tga")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqtiff.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqtiff.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "tiff",
            "tif"
        ],
        "MimeTypes": [
            "image/tiff",
            "image/tiff"
        ]
    },
    "className": "QTiffPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("tiff", "tif")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqwbmp.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqwbmp.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "wbmp"
        ],
        "MimeTypes": [
            "image/vnd.wap.wbmp"
        ]
    },
    "className": "QWbmpPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("wbmp")
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5xu4/plugins/imageformats/libqwebp.so"
Found metadata in lib /usr/local/qt5xu4/plugins/imageformats/libqwebp.so, metadata=
{
    "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
    "MetaData": {
        "Keys": [
            "webp"
        ],
        "MimeTypes": [
            "image/webp"
        ]
    },
    "className": "QWebpPlugin",
    "debug": false,
    "version": 329987
}


Got keys from plugin meta data ("webp")
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/imageformats" ...
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqgif.so"
AL lib: (WW) alc_initconfig: Failed to initialize backend "pulse"
AL lib: (EE) ALCplaybackAlsa_open: Could not open playback device 'default': Device or resource busy
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqicns.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqico.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqjpeg.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqtga.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqtiff.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqwbmp.so"
loaded library "/usr/local/qt5xu4/plugins/imageformats/libqwebp.so"
QMinimalEglIntegration::createPlatformWindow 0x157228

QEglWindow 0x3e6570: 0x157228 0x1

QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5xu4/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/root/qt5build/qt5/dscctests/test2/accessiblebridge" ...
Warning: "Failed to connect: Connection refused"
                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  Might be a silly question but did you thought to call make install after building your custom version of the plugin ?

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  N 1 Reply Last reply
                  0
                  • SGaistS SGaist

                    Might be a silly question but did you thought to call make install after building your custom version of the plugin ?

                    N Offline
                    N Offline
                    nlazovic
                    wrote on last edited by nlazovic
                    #13

                    @SGaist
                    :) of course

                    root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl# make
                    make: Nothing to be done for 'first'.
                    root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl# make install
                    /root/qt5build/qt5/qtbase/bin/qmake -install qinstall -exe ../../../../plugins/platforms/libqminimalegl.so /usr/local/qt5xu4/plugins/platforms/libqminimalegl.so
                    strip --strip-unneeded /usr/local/qt5xu4/plugins/platforms/libqminimalegl.so
                    /root/qt5build/qt5/qtbase/bin/qmake -install qinstall /root/qt5build/qt5/qtbase/lib/cmake/Qt5Gui/Qt5Gui_QMinimalEglIntegrationPlugin.cmake /usr/local/qt5xu4/lib/cmake/Qt5Gui/Qt5Gui_QMinimalEglIntegrationPlugin.cmake
                    root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl#

                    nenad

                    N 1 Reply Last reply
                    0
                    • N nlazovic

                      @SGaist
                      :) of course

                      root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl# make
                      make: Nothing to be done for 'first'.
                      root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl# make install
                      /root/qt5build/qt5/qtbase/bin/qmake -install qinstall -exe ../../../../plugins/platforms/libqminimalegl.so /usr/local/qt5xu4/plugins/platforms/libqminimalegl.so
                      strip --strip-unneeded /usr/local/qt5xu4/plugins/platforms/libqminimalegl.so
                      /root/qt5build/qt5/qtbase/bin/qmake -install qinstall /root/qt5build/qt5/qtbase/lib/cmake/Qt5Gui/Qt5Gui_QMinimalEglIntegrationPlugin.cmake /usr/local/qt5xu4/lib/cmake/Qt5Gui/Qt5Gui_QMinimalEglIntegrationPlugin.cmake
                      root@odroid:~/qt5build/qt5/qtbase/src/plugins/platforms/minimalegl#

                      nenad

                      N Offline
                      N Offline
                      nlazovic
                      wrote on last edited by
                      #14

                      @nlazovic

                      we did few experiments with QT samples (running with 0platfomr minimalegl), to see if / which one will instantiate QMinimalEglBackingStore. Below are the results.
                      Some do, some dont. could not figure out pattern :(

                      example /qtbase/examples/opengl/cube, QMinimalEglBackingStore instantiated !!!
                      using QApplication / QWidget
                      C++ only

                      example /qtmultimedia/examples/multimediawidgets/videowidget, QMinimalEglBackingStore instantiated !!!
                      using QApplication / QWidget
                      C++ only

                      example /qtdeclarative/examples/quick/quickwidgets/quickwidget, QMinimalEglBackingStore instantiated !!!
                      using QApplication / QMainWindow
                      C++/QML
                      App crashes “Segmentation fault”

                      example /qtdeclarative/examples/quick/quickwidgets/qquickviewcomparison, QMinimalEglBackingStore instantiated !!!
                      using QApplication / QWidget
                      C++/QML
                      App crashes “Segmentation fault” / This plugin does not support propagateSizeHints()

                      example /qtdeclarative/examples/quick/embeddedinwidgets, QMinimalEglBackingStore instantiated !!!
                      using QApplication / QMainWindow
                      C++/QML
                      Something fails ?

                      example /qtmultimedia/examples/multimedia/video/qmlvideo, QMinimalEglBackingStore NOT instantiated
                      using QGuiApplication / QQuickView
                      C++/QML

                      example /qtquickcontrols/examples/quickcontrols/controls/filesystembrowser, QMinimalEglBackingStore NOT instantiated
                      using QApplication / QQmlApplicationEngine
                      C++/QML

                      example /qtquickcontrols/examples/quickcontrols/controls/tableview, QMinimalEglBackingStore NOT instantiated
                      Using QtQuickControlsApplication / QQmlApplicationEngine
                      C++/QML

                      example /qtquickcontrols/examples/quickcontrols/controls/touch, QMinimalEglBackingStore NOT instantiated
                      Using QtQuickControlsApplication / QQmlApplicationEngine
                      C++/QML

                      example / qt3d/examples/qt3d/materials, QMinimalEglBackingStore NOT instantiated
                      using QGuiApplication / Qt3DQuickWindow
                      C++/QML

                      1 Reply Last reply
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