diff -r 000000000000 -r 5d03bc08d59c graphicsdeviceinterface/gdi/lookuptable/lookuptable.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graphicsdeviceinterface/gdi/lookuptable/lookuptable.h Tue Feb 02 01:47:50 2010 +0200 @@ -0,0 +1,42 @@ +// Copyright (c) 2006-2009 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: +// + +#ifndef __LOOKUPTABLE_H__ +#define __LOOKUPTABLE_H__ + +#include + +/** +@internalTechnology +*/ + IMPORT_C const TUint16* Convert16to32bppLow(); + IMPORT_C const TUint32* Convert16to32bppHigh(); + +/** +Returns the pointer to the table of 16-bit normalisation table. +The table is currently used for performing un-multiplying Premultiplied Alpha color channels. +Use: Let x be c * a/255, and y = c, then y = (x/a)*255, where a is in 0-255 range. + To use this table, use y = (x * Table[a])>>8. i.e, the inaccurate division is converted + to more accurate multiplication and shift. + +@return pointer to the normalisation table. +@internalTechnology + +*/ +IMPORT_C const TUint16* PtrTo16BitNormalisationTable(); + + + +#endif