misc: better dpi scaling performance

Gitlab: #302

On X11 based,
https://bugreports.qt.io/browse/QTBUG-84082

Change-Id: Id775a6a31fc9f6f9493556fca458555c5962727e

src/commoncomponents/AvatarImage.qml

@@ -18,9 +18,10 @@
 
 import QtQuick 2.14
 import QtQuick.Controls 2.14
-import QtQuick.Window 2.14
+
 import net.jami.Adapters 1.0
 import net.jami.Constants 1.0
+import net.jami.Models 1.0
 
 Item {
     id: root
@@ -98,6 +99,16 @@ Item {
             saveAvatarToConfig()
     }
 
+    function reloadImageSource() {
+        var tempEnableAnimation = enableAnimation
+        var tempImageSource = rootImage.source
+
+        enableAnimation = false
+        rootImage.source = ""
+        rootImage.source = tempImageSource
+        enableAnimation = tempEnableAnimation
+    }
+
     Image {
         id: rootImage
 
@@ -208,4 +219,12 @@ Item {
         radius: 30
         color: JamiTheme.notificationRed
     }
+
+    Connections {
+        target: ScreenInfo
+
+        function onDevicePixelRatioChanged(){
+            reloadImageSource()
+        }
+    }
 }

src/commoncomponents/ResponsiveImage.qml

@@ -19,7 +19,8 @@
 import QtQuick 2.14
 import QtQuick.Controls 2.14
 import QtGraphicalEffects 1.14
-import QtQuick.Window 2.14
+
+import net.jami.Models 1.0
 
 Image {
     id: root
@@ -34,7 +35,6 @@ Image {
     property string checkedSource
     property string color: "transparent"
 
-    property real pixelDensity: Screen.pixelDensity
     property bool isSvg: {
         var match = /[^.]+$/.exec(source)
         return match !== null && match[0] === 'svg'
@@ -62,12 +62,20 @@ Image {
 
     function setSourceSize() {
         if (isSvg) {
-            sourceSize.width = width
-            sourceSize.height = height
-        } else
+            sourceSize = Qt.size(0, 0)
+            sourceSize = Qt.size(width, height)
+        }
+        else
             sourceSize = undefined
     }
 
-    onPixelDensityChanged: setSourceSize()
+    Connections {
+        target: ScreenInfo
+
+        function onDevicePixelRatioChanged(){
+            setSourceSize()
+        }
+    }
+
     Component.onCompleted: setSourceSize()
 }

src/mainapplication.cpp

@@ -36,7 +36,6 @@
 #include <QFontDatabase>
 #include <QMenu>
 #include <QQmlContext>
-#include <QWindow>
 
 #include <locale.h>
 
@@ -120,6 +119,29 @@ fileDebug(QFile* debugFile)
                      });
 }
 
+void
+ScreenInfo::setCurrentFocusWindow(QWindow* window)
+{
+    if (window && !currentFocusWindow_) {
+        currentFocusWindow_ = window;
+        setDevicePixelRatio(currentFocusWindow_->screen()->devicePixelRatio());
+
+        disconnect(devicePixelRatioConnection_);
+        disconnect(currentFocusWindowScreenConnection_);
+
+        currentFocusWindowScreenConnection_
+            = connect(currentFocusWindow_, &QWindow::screenChanged, [this] {
+                  currentFocusWindowScreen_ = currentFocusWindow_->screen();
+                  setDevicePixelRatio(currentFocusWindowScreen_->devicePixelRatio());
+
+                  devicePixelRatioConnection_ = connect(
+                      currentFocusWindowScreen_, &QScreen::physicalDotsPerInchChanged, [this] {
+                          setDevicePixelRatio(currentFocusWindowScreen_->devicePixelRatio());
+                      });
+              });
+    }
+}
+
 MainApplication::MainApplication(int& argc, char** argv)
     : QApplication(argc, argv)
     , engine_(new QQmlApplicationEngine())
@@ -185,11 +207,14 @@ MainApplication::init()
     }
 #endif
 
-
     connect(connectivityMonitor_, &ConnectivityMonitor::connectivityChanged, [] {
         LRCInstance::connectivityChanged();
     });
 
+    connect(this, &QGuiApplication::focusWindowChanged, [this] {
+        screenInfo_.setCurrentFocusWindow(this->focusWindow());
+    });
+
     QObject::connect(
         &LRCInstance::instance(),
         &LRCInstance::quitEngineRequested,
@@ -241,37 +266,27 @@ MainApplication::loadTranslations()
     QTranslator* lrcTranslator_lang = new QTranslator(this);
     QTranslator* lrcTranslator_name = new QTranslator(this);
     if (locale_name != locale_lang) {
-        if (lrcTranslator_lang->load(appDir
-                                     + QDir::separator() + "libringclient"
-                                     + QDir::separator() + "translations"
-                                     + QDir::separator() + "lrc_"
-                                     + locale_lang)) {
+        if (lrcTranslator_lang->load(appDir + QDir::separator() + "libringclient" + QDir::separator()
+                                     + "translations" + QDir::separator() + "lrc_" + locale_lang)) {
             installTranslator(lrcTranslator_lang);
         }
     }
-    if (lrcTranslator_name->load(appDir
-                                 + QDir::separator() + "libringclient"
-                                 + QDir::separator() + "translations"
-                                 + QDir::separator() + "lrc_"
-                                 + locale_name)) {
+    if (lrcTranslator_name->load(appDir + QDir::separator() + "libringclient" + QDir::separator()
+                                 + "translations" + QDir::separator() + "lrc_" + locale_name)) {
         installTranslator(lrcTranslator_name);
     }
 
     QTranslator* mainTranslator_lang = new QTranslator(this);
     QTranslator* mainTranslator_name = new QTranslator(this);
     if (locale_name != locale_lang) {
-        if (mainTranslator_lang->load(appDir
-                                      + QDir::separator() + "ring"
-                                      + QDir::separator() + "translations"
-                                      + QDir::separator() + "ring_client_windows_"
+        if (mainTranslator_lang->load(appDir + QDir::separator() + "ring" + QDir::separator()
+                                      + "translations" + QDir::separator() + "ring_client_windows_"
                                       + locale_lang)) {
             installTranslator(mainTranslator_lang);
         }
     }
-    if (mainTranslator_name->load(appDir
-                                  + QDir::separator() + "ring"
-                                  + QDir::separator() + "translations"
-                                  + QDir::separator() + "ring_client_windows_"
+    if (mainTranslator_name->load(appDir + QDir::separator() + "ring" + QDir::separator()
+                                  + "translations" + QDir::separator() + "ring_client_windows_"
                                   + locale_name)) {
         installTranslator(mainTranslator_name);
     }
@@ -381,6 +396,8 @@ MainApplication::initQmlEngine()
     engine_->addImageProvider(QLatin1String("tintedPixmap"), new TintedButtonImageProvider());
     engine_->addImageProvider(QLatin1String("avatarImage"), new AvatarImageProvider());
 
+    engine_->rootContext()->setContextProperty("ScreenInfo", &screenInfo_);
+
     engine_->setObjectOwnership(&LRCInstance::avModel(), QQmlEngine::CppOwnership);
     engine_->setObjectOwnership(&LRCInstance::pluginModel(), QQmlEngine::CppOwnership);
     engine_->setObjectOwnership(LRCInstance::getUpdateManager(), QQmlEngine::CppOwnership);

src/mainapplication.h

@@ -1,4 +1,4 @@
-/*!
+/*!
  * Copyright (C) 2020 by Savoir-faire Linux
  * Author: Edric Ladent Milaret <edric.ladent-milaret@savoirfairelinux.com>
  * Author: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>
@@ -24,11 +24,42 @@
 #include <QApplication>
 #include <QQmlApplicationEngine>
 #include <QQmlEngine>
+#include <QScreen>
+#include <QWindow>
 
 #include <memory>
 
 class ConnectivityMonitor;
 
+// Provides information about the screen the app is displayed on
+class ScreenInfo : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(double devicePixelRatio MEMBER devicePixelRatio_ NOTIFY devicePixelRatioChanged)
+public:
+    void setCurrentFocusWindow(QWindow* window);
+    void setDevicePixelRatio(double ratio)
+    {
+        if (ratio != devicePixelRatio_) {
+            devicePixelRatio_ = ratio;
+
+            emit devicePixelRatioChanged();
+        }
+    }
+
+signals:
+    void devicePixelRatioChanged();
+
+private:
+    double devicePixelRatio_ {0.0};
+
+    QMetaObject::Connection currentFocusWindowScreenConnection_;
+    QMetaObject::Connection devicePixelRatioConnection_;
+
+    QWindow* currentFocusWindow_ {nullptr};
+    QScreen* currentFocusWindowScreen_ {nullptr};
+};
+
 class MainApplication : public QApplication
 {
     Q_OBJECT
@@ -52,5 +83,7 @@ private:
 private:
     QScopedPointer<QFile> debugFile_;
     QScopedPointer<QQmlApplicationEngine> engine_;
-    ConnectivityMonitor* connectivityMonitor_;
+    ConnectivityMonitor* connectivityMonitor_ {nullptr};
+
+    ScreenInfo screenInfo_;
 };

src/mainview/components/WelcomePage.qml

@@ -49,8 +49,8 @@ Rectangle {
                 id: jamiLogoImage
 
                 Layout.alignment: Qt.AlignCenter
-                Layout.preferredWidth: welcomePageColumnLayout.width
-                Layout.preferredHeight: 100
+                Layout.preferredWidth: Math.min(welcomePageColumnLayout.width, 330)
+                Layout.preferredHeight: Math.min(welcomePageColumnLayout.width / 3, 110)
                 Layout.bottomMargin: 10
 
                 smooth: true

src/wizardview/components/WelcomePage.qml

@@ -65,8 +65,8 @@ Rectangle {
             id: welcomeLogo
 
             Layout.alignment: Qt.AlignCenter
-            Layout.preferredWidth: 300
-            Layout.preferredHeight: 150
+            Layout.preferredWidth: 330
+            Layout.preferredHeight: 110
 
             smooth: true
             antialiasing: true