[backends/hwcomposer] Base HwcomposerScreens on BasicScreens

backends/hwcomposer/hwcomposer_backend.h

@@ -53,6 +53,10 @@ public:
     Screens *createScreens(QObject *parent = nullptr) override;
     OpenGLBackend *createOpenGLBackend() override;
 
+    QSize screenSize() const override {
+        return m_displaySize;
+    }
+
     HwcomposerWindow *createSurface();
 
     QSize size() const {

backends/hwcomposer/screens_hwcomposer.cpp

@@ -24,47 +24,13 @@ namespace KWin
 {
 
 HwcomposerScreens::HwcomposerScreens(HwcomposerBackend *backend, QObject *parent)
-    : Screens(parent)
+    : BasicScreens(backend, parent)
     , m_backend(backend)
 {
 }
 
 HwcomposerScreens::~HwcomposerScreens() = default;
 
-void HwcomposerScreens::init()
-{
-    Screens::init();
-    updateCount();
-    emit changed();
-}
-
-QRect HwcomposerScreens::geometry(int screen) const
-{
-    if (screen == 0) {
-        return QRect(QPoint(0, 0), size(screen));
-    }
-    return QRect();
-}
-
-QSize HwcomposerScreens::size(int screen) const
-{
-    if (screen == 0) {
-        return m_backend->size();
-    }
-    return QSize();
-}
-
-void HwcomposerScreens::updateCount()
-{
-    setCount(1);
-}
-
-int HwcomposerScreens::number(const QPoint &pos) const
-{
-    Q_UNUSED(pos)
-    return 0;
-}
-
 float HwcomposerScreens::refreshRate(int screen) const
 {
     Q_UNUSED(screen)

backends/hwcomposer/screens_hwcomposer.h

@@ -25,17 +25,12 @@ namespace KWin
 {
 class HwcomposerBackend;
 
-class HwcomposerScreens : public Screens
+class HwcomposerScreens : public BasicScreens
 {
     Q_OBJECT
 public:
     HwcomposerScreens(HwcomposerBackend *backend, QObject *parent = nullptr);
     virtual ~HwcomposerScreens();
-    void init() override;
-    QRect geometry(int screen) const override;
-    int number(const QPoint &pos) const override;
-    QSize size(int screen) const override;
-    void updateCount() override;
     float refreshRate(int screen) const override;
 
 private: