guifader.h

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/********************************************************************************/
/*                                                                              */
/*  Netrinjo-Engine - a library for game-development                            */
/*  Copyright (C) 1999, 2000, 2005 by Tobias Nadler und Georg Schnattinger      */
/*                                                                              */
/*  This library is free software; you can redistribute it and/or               */
/*  modify it under the terms of the GNU Lesser General Public                  */
/*  License as published by the Free Software Foundation; either                */
/*  version 2.1 of the License, or (at your option) any later version.          */
/*                                                                              */
/*  This library is distributed in the hope that it will be useful,             */
/*  but WITHOUT ANY WARRANTY; without even the implied warranty of              */
/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU           */
/*  Lesser General Public License for more details.                             */
/*                                                                              */
/*  You should have received a copy of the GNU Lesser General Public            */
/*  License along with this library; if not, write to the Free Software         */
/*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   */
/*                                                                              */
/********************************************************************************/

#ifndef GUIFADER_H
#define GUIFADER_H

#include "uiobject.h"
#include "tinyxml.h"


#define GAMMA_WHITE     0x1FFFF
#define GAMMA_BLACK     0x0000
#define GAMMA_NORMAL    0x10000
#define GAMMA_INVERT    0x80000000
//#define FADEFUNC_END  (~0)

class DECLSPEC GuiFader : public UiObject
{
public:
    typedef bool (*FadeFunction)( Uint32 time, Uint32 *r, Uint32 *g, Uint32 *b );

    DECLSPEC GuiFader(BasicObject *parent, const char *name, Uint32 normal = 0xFFFF );
    DECLSPEC GuiFader(TiXmlElement *el, BasicObject *parent);
    virtual DECLSPEC ~GuiFader();

    virtual const char *getClassName()  { return "GuiFrame"; }
    void setToNormal()  { setGamma( nNormal ); }
    DECLSPEC bool setGamma( Uint32 intensity );
    DECLSPEC bool setGamma( Uint32 r, Uint32 g, Uint32 b );
    DECLSPEC bool setGammaInverted( Uint32 intensity );

    DECLSPEC void fadeOut( Uint32 ms );
    DECLSPEC void fadeIn( Uint32 ms );
    DECLSPEC void fade( Uint32 ms, Uint32 end );
    DECLSPEC void fadeByFunction( FadeFunction func );

    static GuiFader *the;
    DECLSPEC static GuiFader *getThe();

    Uint32 nNormal;
protected:
    virtual DECLSPEC Uint32 onFrame();

private:
    FadeFunction pFunction;

    bool bFading;
    Uint32 tDuration, tEnd;
    Uint32 nEnd, nStart;
    Uint32 nNow;

    Uint16 r[256],
        g[256],
        b[256];
        
    friend class GuiManager;
};

#endif

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