linuxfb: Adapt to initialize() pattern

Migrate to the new 5.2 pattern: Prevent relying on the event
dispatcher in the constructor by performing initialization later
in initialize() instead.

Change-Id: Ifa6024affc35e995d6e33a63fa813da9df0c491b
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>

src/plugins/platforms/linuxfb/qlinuxfbintegration.cpp

@@ -56,9 +56,8 @@ QT_BEGIN_NAMESPACE
 QLinuxFbIntegration::QLinuxFbIntegration(const QStringList &paramList)
     : m_fontDb(new QGenericUnixFontDatabase())
 {
-    m_primaryScreen = new QLinuxFbScreen;
-    if (m_primaryScreen->initialize(paramList))
-        screenAdded(m_primaryScreen);
+    m_primaryScreen = new QLinuxFbScreen(paramList);
+    screenAdded(m_primaryScreen);
 }
 
 QLinuxFbIntegration::~QLinuxFbIntegration()
@@ -66,6 +65,12 @@ QLinuxFbIntegration::~QLinuxFbIntegration()
     delete m_primaryScreen;
 }
 
+void QLinuxFbIntegration::initialize()
+{
+    if (!m_primaryScreen->initialize())
+        qWarning("linuxfb: Failed to initialize screen");
+}
+
 bool QLinuxFbIntegration::hasCapability(QPlatformIntegration::Capability cap) const
 {
     switch (cap) {

src/plugins/platforms/linuxfb/qlinuxfbintegration.h

@@ -56,14 +56,16 @@ public:
     QLinuxFbIntegration(const QStringList &paramList);
     ~QLinuxFbIntegration();
 
-    bool hasCapability(QPlatformIntegration::Capability cap) const;
+    void initialize() Q_DECL_OVERRIDE;
+    bool hasCapability(QPlatformIntegration::Capability cap) const Q_DECL_OVERRIDE;
+
+    QPlatformPixmap *createPlatformPixmap(QPlatformPixmap::PixelType type) const Q_DECL_OVERRIDE;
+    QPlatformWindow *createPlatformWindow(QWindow *window) const Q_DECL_OVERRIDE;
+    QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const Q_DECL_OVERRIDE;
+    QAbstractEventDispatcher *createEventDispatcher() const Q_DECL_OVERRIDE;
+    QPlatformFontDatabase *fontDatabase() const Q_DECL_OVERRIDE;
 
-    QPlatformPixmap *createPlatformPixmap(QPlatformPixmap::PixelType type) const;
-    QPlatformWindow *createPlatformWindow(QWindow *window) const;
-    QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const;
-    QAbstractEventDispatcher *createEventDispatcher() const;
     QList<QPlatformScreen *> screens() const;
-    QPlatformFontDatabase *fontDatabase() const;
 
 private:
     QLinuxFbScreen *m_primaryScreen;

src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp

@@ -296,8 +296,8 @@ static void blankScreen(int fd, bool on)
     ioctl(fd, FBIOBLANK, on ? VESA_POWERDOWN : VESA_NO_BLANKING);
 }
 
-QLinuxFbScreen::QLinuxFbScreen()
-    : mFbFd(-1), mBlitter(0)
+QLinuxFbScreen::QLinuxFbScreen(const QStringList &args)
+    : mArgs(args), mFbFd(-1), mBlitter(0)
 {
 }
 
@@ -316,7 +316,7 @@ QLinuxFbScreen::~QLinuxFbScreen()
     delete mBlitter;
 }
 
-bool QLinuxFbScreen::initialize(const QStringList &args)
+bool QLinuxFbScreen::initialize()
 {
     QRegExp ttyRx(QLatin1String("tty=(.*)"));
     QRegExp fbRx(QLatin1String("fb=(.*)"));
@@ -330,7 +330,7 @@ bool QLinuxFbScreen::initialize(const QStringList &args)
     bool doSwitchToGraphicsMode = true;
 
     // Parse arguments
-    foreach (const QString &arg, args) {
+    foreach (const QString &arg, mArgs) {
         if (arg == QLatin1String("nographicsmodeswitch"))
             doSwitchToGraphicsMode = false;
         else if (sizeRx.indexIn(arg) != -1)

src/plugins/platforms/linuxfb/qlinuxfbscreen.h

@@ -53,15 +53,16 @@ class QLinuxFbScreen : public QFbScreen
 {
     Q_OBJECT
 public:
-    QLinuxFbScreen();
+    QLinuxFbScreen(const QStringList &args);
     ~QLinuxFbScreen();
 
-    bool initialize(const QStringList &args);
+    bool initialize();
 
 public slots:
     QRegion doRedraw();
 
 private:
+    QStringList mArgs;
     int mFbFd;
     int mTtyFd;