Add basic backingstore implementation to kms

This allows using the kms plugin in QWidget apps having a single
(preferably fullscreen) top-level widget.

Based on eglfs' implementation. Dirty rectangle tracking is missing,
should be added later.

There is no composition so multiple TLWs will not work nicely.

Change-Id: Ia78589d1a375925ebdcc46aa20fc1619ec14d6cc
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
Reviewed-by: Elvis Lee <kwangwoong.lee@lge.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/plugins/platforms/kms/qkmsbackingstore.h b/src/plugins/platforms/kms/qkmsbackingstore.h
index 59d9c9ad94..6357019210 100644
--- a/src/plugins/platforms/kms/qkmsbackingstore.h
+++ b/src/plugins/platforms/kms/qkmsbackingstore.h
@@ -47,17 +47,28 @@
 
 QT_BEGIN_NAMESPACE
 
+class QOpenGLContext;
+class QOpenGLShaderProgram;
+
 class QKmsBackingStore : public QPlatformBackingStore
 {
 public:
     QKmsBackingStore(QWindow *window);
+    ~QKmsBackingStore();
 
     QPaintDevice *paintDevice();
+
+    void beginPaint(const QRegion &);
+    void endPaint();
+
     void flush(QWindow *window, const QRegion &region, const QPoint &offset);
     void resize(const QSize &size, const QRegion &staticContents);
 
 private:
+    QOpenGLContext *m_context;
     QImage m_image;
+    uint m_texture;
+    QOpenGLShaderProgram *m_program;
 };
 
 QT_END_NAMESPACE