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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 Offline
    A Offline
    Avanish Singh
    wrote on last edited by
    #3

    @SGaist : Thanks

    1 Reply Last reply
    1
    • A Offline
      A Offline
      Avanish Singh
      wrote on last edited by
      #4

      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 1 Reply Last reply
      0
      • 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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