graphicsdeviceinterface/screendriver/inc/cdsb.h
author jakl.martin@cell-telecom.com
Mon, 06 Dec 2010 18:07:30 +0100
branchNewGraphicsArchitecture
changeset 218 99b3451c560e
parent 0 5d03bc08d59c
permissions -rw-r--r--
Fix for Bug 3890
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
0
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// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef __CDSB_H__
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#define __CDSB_H__
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#include <e32base.h>
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#include <bitdev.h>
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/**
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Direct Screen Bitmap.
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API to allow provide synchronisation of the display of images with the
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displays refresh to prevent tearing.
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This is an abstract base class, so must be derived from on a per-variant basis.
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@publishedPartner
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@released
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Note: this class is likely to be deprecated in the future
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*/ 
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class CDirectScreenBitmap : public CBase
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	{
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public:
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	enum TSettingsFlags
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		{
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		ENone = 0,
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		EDoubleBuffer = 1,
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		EIncrementalUpdate = 2
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		};
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public:
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	/**
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	Constructs a CDirectScreenBitmap derived object.
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    The default screen (with number 0) will be used.
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    @return A pointer to the created CDirectScreenBitmap object
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    @leave KErrNoMemory There was insufficient memory to allocate the CDirectScreenBitmap derived object
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	*/
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	IMPORT_C static CDirectScreenBitmap* NewL();	
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	/**
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	Constructs a CDirectScreenBitmap derived object.
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	@param aScreenNo Screen number, used by the CDirectScreenBitmap object.
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    @return A pointer to the created CDirectScreenBitmap object
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    @leave KErrNoMemory There was insufficient memory to allocate the CDirectScreenBitmap derived object
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	*/
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	IMPORT_C static CDirectScreenBitmap* NewL(TInt aScreenNo);	
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    /**
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	Creates a CDirectScreenBitmap object which can be used for drawing to
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	a region of the screen indicated by aScreenRect.  This region must have
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	previously been 'claimed' via the Window Servers Direct Screen Access API.
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	@param aScreenRect The region to be displayed
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	@param aSettingsFlags The mode of operation. The upper 3 bits are used 
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                          for the screen number value: 0..7.  By default the screen 
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                          with  number 0 will be used.
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	@return KErrNone if successful
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	        KErrNoMemory if there was insufficient memory
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	        KErrNotSupported if the creation failed for other reasons
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	*/
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	virtual TInt Create(const TRect& aScreenRect, TSettingsFlags aSettingsFlags) =0;
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	/**
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	Returns a TAcceleratedBitmapInfo referring to a bitmap which the
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	applicationcan render to.
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	@param aBitmapInfo The Bitmap
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	@return KErrNone if successful, another error code otherwise
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	*/
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	virtual TInt BeginUpdate(TAcceleratedBitmapInfo& aBitmapInfo) =0;
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	/**
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	Indicates to the Video Driver that the bitmap corresponding to the
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	update has been fully rendered.  The video driver will perform
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	the actions required to copy this to the frame buffer.
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	The request status aComplete will be signalled when the copying has completed.
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	@param aComplete Asynchronous completion status
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	*/
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	virtual void EndUpdate(TRequestStatus& aComplete) =0;
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	/**
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	Indicates to the Video Driver that the area indicated in aScreenRect has
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	been fully rendered.  The video driver will perform the actions required 
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	to copy this to the frame buffer.
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	The request status aComplete will be signalled when the copying has completed.
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	Note: aScreenRects coordinates are relative to the screen, not the update region specified
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	in Create().  aScreenRect must fit entirely within the bounds of the original region passed
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	to Create().
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	@param aScreenRect The region to update
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	@param aComplete Asynchronous completion status
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	*/
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	virtual void EndUpdate(const TRect& aScreenRect, TRequestStatus& aComplete) =0;
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	/**
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	Deletes all resources associated with the CDirectScreenBitmap object.
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	*/
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	virtual void Close() =0;
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	};
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#endif