Bug 298889 - iframe invisible when window is transparent; r+sr=roc

layout/base/nsDocumentViewer.cpp

@@ -2226,7 +2226,7 @@ DocumentViewerImpl::MakeWindow(const nsSize& aSize)
       if (container) {
         container->GetSameTypeParent(getter_AddRefs(sameTypeParent));
       }
-      if (!sameTypeParent) {
+      if (!sameTypeParent && mParentWidget->GetTransparencyMode() != eTransparencyTransparent) {
         containerView = nsnull;
       }
     }

view/src/nsScrollPortView.cpp

@@ -525,7 +525,8 @@ void nsScrollPortView::Scroll(nsView *aScrolledView, nsPoint aTwipsDelta, nsIntP
     nsRegion updateRegion;
     PRBool canBitBlit = scrollWidget &&
                         ((mScrollProperties & NS_SCROLL_PROPERTY_ALWAYS_BLIT) ||
-                         mViewManager->CanScrollWithBitBlt(aScrolledView, aTwipsDelta, &updateRegion));
+                         mViewManager->CanScrollWithBitBlt(aScrolledView, aTwipsDelta, &updateRegion)) &&
+                        scrollWidget->GetTransparencyMode() != eTransparencyTransparent;
 
     if (canBitBlit) {
       // We're going to bit-blit.  Let the viewmanager know so it can

view/src/nsViewManager.cpp

@@ -554,6 +554,10 @@ void nsViewManager::AddCoveringWidgetsToOpaqueRegion(nsRegion &aRgn, nsIDeviceCo
     return;
   }
   
+  if (widget->GetTransparencyMode() == eTransparencyTransparent) {
+    return;
+  }
+
   for (nsIWidget* childWidget = widget->GetFirstChild();
        childWidget;
        childWidget = childWidget->GetNextSibling()) {
@@ -813,6 +817,7 @@ nsViewManager::UpdateWidgetArea(nsView *aWidgetView, const nsRegion &aDamagedReg
   // accumulate the union of all the child widget areas, or at least
   // some subset of that.
   nsRegion children;
+  if (widget->GetTransparencyMode() != eTransparencyTransparent) {
     for (nsIWidget* childWidget = widget->GetFirstChild();
          childWidget;
          childWidget = childWidget->GetNextSibling()) {
@@ -832,6 +837,7 @@ nsViewManager::UpdateWidgetArea(nsView *aWidgetView, const nsRegion &aDamagedReg
         }
       }
     }
+  }
 
   nsRegion leftOver;
   leftOver.Sub(intersection, children);

widget/src/windows/nsWindow.cpp

@@ -8507,6 +8507,11 @@ void nsWindow::SetWindowTranslucencyInner(nsTransparencyMode aMode)
   style |= topWindow->WindowStyle();
   exStyle |= topWindow->WindowExStyle();
 
+  if (aMode == eTransparencyTransparent) {
+    style &= ~(WS_CAPTION | WS_THICKFRAME | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX);
+    exStyle &= ~(WS_EX_DLGMODALFRAME | WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE);
+  }
+
   VERIFY_WINDOW_STYLE(style);
   ::SetWindowLongPtrW(hWnd, GWL_STYLE, style);
   ::SetWindowLongPtrW(hWnd, GWL_EXSTYLE, exStyle);