graphicsdeviceinterface/directgdi/src/directgdiimagetarget.cpp
changeset 0 5d03bc08d59c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsdeviceinterface/directgdi/src/directgdiimagetarget.cpp	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,86 @@
+// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#include "directgdidriver.h"
+#include <graphics/directgdiimagetarget.h>
+#include "directgdipaniccodes.h"
+
+/**
+Default constructor. 
+Only for embedding instances of RDirectGdiImageTarget into other classes as data members. 
+Before a RDirectGdiImageTarget can be used the other constructor must be called. 
+*/
+EXPORT_C RDirectGdiImageTarget::RDirectGdiImageTarget()
+	: iDriver(NULL), iHandle(KNullHandle)
+	{
+	}
+
+/**
+Constructor.
+
+@param 	aDriver The CDirectGdiDriver for this thread.
+
+@pre 	CDirectGdiDriver object has been initialised from the calling thread.
+@post 	This handle class has a pointer to the CDirectGdiDriver object for this
+		thread, and is not associated with any DirectGDI adaptation specific resource.
+*/
+EXPORT_C RDirectGdiImageTarget::RDirectGdiImageTarget(CDirectGdiDriver& aDriver)
+	: iDriver(&aDriver), iHandle(KNullHandle)
+	{
+	}
+
+/**
+Creates a DirectGDI adaptation-specific resource from the given image resource
+so it can be used as a target of DirectGDI rendering.
+
+@param 	aImage The image resource.
+
+@pre 	The CDirectGdiDriver object has been set. The image resource has been
+		fully constructed and created with the correct usage that allows it to
+		be used as a DirectGDI target.
+@post 	The DirectGDI adaptation-specific resource that is bound to the given
+		image resource is created and this handle is now associated with it.
+		The reference counter on the image resource is incremented.
+
+@return KErrNone if successful, KErrArgument if the image resource is not valid,
+		KErrAlreadyExists if this handle is already associated with a DirectGDI
+		specific resource,  KErrNotSupported if the image resource is not created
+		with the correct usage, otherwise one of the system-wide error codes.
+*/
+EXPORT_C TInt RDirectGdiImageTarget::Create(const RSgImage& aImage)
+	{
+	GRAPHICS_ASSERT_ALWAYS(iDriver, EDirectGdiPanicImageTargetWithoutDriver);
+	return iDriver->CreateImageTarget(*this, aImage);
+	}
+
+/**
+Destroys the DirectGDI adaptation-specific resource associated with this handle. 
+Calling this method on a handle that is not associated with any DirectGDI 
+adaptation-specific resource will do nothing. Once Close() is called, this handle can be reused.
+
+@pre	The CDirectGdiDriver object for this handle has been set.
+@post	The DirectGDI specific resource associated with this handle will be destroyed
+		(at any time preferred by the adaptation). This handle is no longer associated
+		with a DirectGDI specific resource. The reference counter of the underlying
+		image resource is decremented. 
+*/
+EXPORT_C void RDirectGdiImageTarget::Close()
+	{
+	if (iHandle != KNullHandle)
+		{
+		GRAPHICS_ASSERT_ALWAYS(iDriver, EDirectGdiPanicImageTargetWithoutDriver);
+		iDriver->CloseImageTarget(*this);
+		}
+	}