Implement QDirectFBScreen::surfaceForWidget

Allow applications to get a pointer to the surface of the window surface
for a given widget or a subsurface of the widget.

This function ignores whether or not the widget is fully or partially
obscured.

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

4 files changed, 56 insertions, 0 deletions

diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
index dbe8926..1bf74d4 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
@@ -1557,5 +1557,36 @@ void QDirectFBScreen::setDirectFBImageProvider(IDirectFBImageProvider *provider)
 }
 #endif
 
+IDirectFBSurface * QDirectFBScreen::surfaceForWidget(const QWidget *widget, QRect *rect) const
+{
+    Q_ASSERT(widget);
+    if (!widget->isVisible() || widget->size().isNull())
+        return 0;
+
+    const QWSWindowSurface *surface = static_cast<const QWSWindowSurface*>(widget->windowSurface());
+    if (surface && surface->key() == QLatin1String("directfb")) {
+        return static_cast<const QDirectFBWindowSurface*>(surface)->surfaceForWidget(widget, rect);
+    }
+    return 0;
+}
 
+IDirectFBSurface *QDirectFBScreen::subSurfaceForWidget(const QWidget *widget, const QRect &area) const
+{
+    Q_ASSERT(widget);
+    QRect rect;
+    IDirectFBSurface *surface = surfaceForWidget(widget, &rect);
+    IDirectFBSurface *subSurface = 0;
+    if (surface) {
+        if (!area.isNull())
+            rect &= area.translated(widget->mapTo(widget->window(), QPoint(0, 0)));
+        if (!rect.isNull()) {
+            const DFBRectangle subRect = {rect.x(), rect.y(), rect.width(), rect.height() };
+            const DFBResult result = surface->GetSubSurface(surface, &subRect, &subSurface);
+            if (result != DFB_OK) {
+                DirectFBError("QDirectFBScreen::subSurface(): Can't get sub surface", result);
+            }
+        }
+    }
+    return subSurface;
+}
 
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
index 8ec91c7..8af4e0f 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
@@ -152,6 +152,9 @@ public:
         return static_cast<QDirectFBScreen*>(inst);
     }
 
+    IDirectFBSurface *surfaceForWidget(const QWidget *widget, QRect *rect) const;
+    IDirectFBSurface *subSurfaceForWidget(const QWidget *widget, const QRect &area = QRect()) const;
+
     IDirectFB *dfb();
 #ifdef QT_NO_DIRECTFB_WM
     IDirectFBSurface *primarySurface();
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp
index 2f240fb..aa98a13 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp
@@ -466,6 +466,27 @@ QImage *QDirectFBWindowSurface::buffer(const QWidget *widget)
     return img;
 }
 
+IDirectFBSurface *QDirectFBWindowSurface::surfaceForWidget(const QWidget *widget, QRect *rect) const
+{
+    Q_ASSERT(widget);
+    if (!dfbSurface) {
+        if (sibling && (!sibling->sibling || sibling->dfbSurface))
+            return sibling->surfaceForWidget(widget, rect);
+        return 0;
+    }
+    QWidget *win = window();
+    Q_ASSERT(win);
+    if (rect) {
+        if (win == widget) {
+            *rect = widget->rect();
+        } else {
+            *rect = QRect(widget->mapTo(win, QPoint(0, 0)), widget->size());
+        }
+    }
+    Q_ASSERT(win == widget || widget->isAncestorOf(win));
+    return dfbSurface;
+}
+
 void QDirectFBWindowSurface::updateFormat()
 {
     imageFormat = dfbSurface ? QDirectFBScreen::getImageFormat(dfbSurface) : QImage::Format_Invalid;
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.h b/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.h
index 0da3a98..707561b 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.h
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.h
@@ -89,6 +89,7 @@ public:
     void endPaint(const QRegion &);
 
     QImage *buffer(const QWidget *widget);
+    IDirectFBSurface *surfaceForWidget(const QWidget *widget, QRect *rect) const;
 private:
     void updateFormat();
 #ifdef QT_DIRECTFB_WM