* When allocating a new Window, check the allocation of the DrawingEngine

instance by introducing Window::InitCheck(), use new (nothrow).
* Window is responsible for the DrawingEngine instance, but forgot to delete
  it.
* OffscreenWindow is no longer special, every Window owns a DrawingEngine,
  no need to delete it anymore, but since it already deletes the HWInterface
  instance, it needs to detach the DrawingEngine from it.
* Use new (nothrow) in OffscreenWindow as well.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24308 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/OffscreenWindow.cpp

@@ -9,6 +9,7 @@
 
 #include "OffscreenWindow.h"
 
+#include <new>
 #include <stdio.h>
 
 #include <Debug.h>
@@ -17,15 +18,20 @@
 #include "DrawingEngine.h"
 #include "ServerBitmap.h"
 
+using std::nothrow;
+
 
 OffscreenWindow::OffscreenWindow(ServerBitmap* bitmap,
 		const char* name, ::ServerWindow* window)
 	: Window(bitmap->Bounds(), name,
 			B_NO_BORDER_WINDOW_LOOK, B_NORMAL_WINDOW_FEEL,
-			0, 0, window, new DrawingEngine()),
+			0, 0, window, new (nothrow) DrawingEngine()),
 	fBitmap(bitmap),
-	fHWInterface(new BitmapHWInterface(fBitmap))
+	fHWInterface(new (nothrow) BitmapHWInterface(fBitmap))
 {
+	if (!fHWInterface || !GetDrawingEngine())
+		return;
+
 	fHWInterface->Initialize();
 	GetDrawingEngine()->SetHWInterface(fHWInterface);
 
@@ -39,11 +45,14 @@ OffscreenWindow::OffscreenWindow(ServerBitmap* bitmap,
 
 OffscreenWindow::~OffscreenWindow()
 {
-	fHWInterface->LockExclusiveAccess();
-	// Unlike normal windows, we own the DrawingEngine instance
-	delete GetDrawingEngine();
-	fHWInterface->Shutdown();
-	fHWInterface->UnlockExclusiveAccess();
-	delete fHWInterface;
+	if (GetDrawingEngine())
+		GetDrawingEngine()->SetHWInterface(NULL);
+
+	if (fHWInterface) {
+		fHWInterface->LockExclusiveAccess();
+		fHWInterface->Shutdown();
+		fHWInterface->UnlockExclusiveAccess();
+		delete fHWInterface;
+	}
 }
 

src/servers/app/ServerWindow.cpp

@@ -282,8 +282,11 @@ ServerWindow::Init(BRect frame, window_look look, window_feel feel,
 	// We cannot call MakeWindow in the constructor, since it
 	// is a virtual function!
 	fWindow = MakeWindow(frame, fTitle, look, feel, flags, workspace);
-	if (!fWindow)
+	if (!fWindow || fWindow->InitCheck() != B_OK) {
+		delete fWindow;
+		fWindow = NULL;
 		return B_NO_MEMORY;
+	}
 
 	if (!fWindow->IsOffscreenWindow()) {
 		fDesktop->AddWindow(fWindow);
@@ -2999,7 +3002,7 @@ ServerWindow::MakeWindow(BRect frame, const char* name,
 	// The non-offscreen ServerWindow uses the DrawingEngine instance from
 	// the desktop.
 	return new (nothrow) ::Window(frame, name, look, feel, flags,
-		workspace, this, new DrawingEngine(fDesktop->HWInterface()));
+		workspace, this, new (nothrow) DrawingEngine(fDesktop->HWInterface()));
 }
 
 

src/servers/app/Window.cpp

@@ -175,11 +175,24 @@ Window::Window(const BRect& frame, const char *name,
 
 Window::~Window()
 {
-	if (fTopView)
+	if (fTopView) {
 		fTopView->DetachedFromWindow();
+		delete fTopView;
+	}
 
-	delete fTopView;
 	delete fDecorator;
+
+	delete fDrawingEngine;
+}
+
+
+status_t
+Window::InitCheck() const
+{
+	if (!fDrawingEngine)
+		return B_NO_MEMORY;
+	// TODO: anything else?
+	return B_OK;
 }
 
 

src/servers/app/Window.h

@@ -50,6 +50,8 @@ public:
 									DrawingEngine* drawingEngine);
 	virtual						~Window();
 
+			status_t			InitCheck() const;
+
 			BRect				Frame() const { return fFrame; }
 			const char*			Title() const { return fTitle.String(); }