Rewrite of DirectFB locking mechanism

DirectFB allows you to have a locked subSurface that remains valid while
you paint on the unlocked "parent" surface.

The only limitation is that when accessing the locked memory you might
have to call DirectFB->WaitIdle() in case pending GPU operations aren't
finished.

After this we keep the locked surface around at all times (from the
first time it's requested) until the surface dies. Previous calls to
lock() will just call WaitIdle if necessary and previous calls to unlock
now just mark the surface as dirty and in need of a WaitIdle if someone
needs to access its pixel data.

Reviewed-by: Donald Carr <donald.carr@nokia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
index e74adb1..0ce7a53 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
@@ -54,6 +54,9 @@ QT_BEGIN_NAMESPACE
 
 QT_MODULE(Gui)
 
+#if !defined QT_NO_DIRECTFB_SUBSURFACE && !defined QT_DIRECTFB_SUBSURFACE
+#define QT_DIRECTFB_SUBSURFACE
+#endif
 #if !defined QT_NO_DIRECTFB_LAYER && !defined QT_DIRECTFB_LAYER
 #define QT_DIRECTFB_LAYER
 #endif
@@ -166,8 +169,11 @@ public:
         return static_cast<QDirectFBScreen*>(inst);
     }
 
+    void waitIdle();
     IDirectFBSurface *surfaceForWidget(const QWidget *widget, QRect *rect) const;
+#ifdef QT_DIRECTFB_SUBSURFACE
     IDirectFBSurface *subSurfaceForWidget(const QWidget *widget, const QRect &area = QRect()) const;
+#endif
 
     IDirectFB *dfb();
 #ifdef QT_NO_DIRECTFB_WM
@@ -199,6 +205,12 @@ public:
     IDirectFBSurface *createDFBSurface(DFBSurfaceDescription desc,
                                        SurfaceCreationOptions options,
                                        DFBResult *result);
+#ifdef QT_DIRECTFB_SUBSURFACE
+    IDirectFBSurface *getSubSurface(IDirectFBSurface *surface,
+                                    const QRect &rect,
+                                    SurfaceCreationOptions options,
+                                    DFBResult *result);
+#endif
 
     void flipSurface(IDirectFBSurface *surface, DFBSurfaceFlipFlags flipFlags,
                      const QRegion &region, const QPoint &offset);