source: GTP/trunk/App/Demos/Geom/OgreStuff/include/OgreILUtil.h @ 1812

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program 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 of the License, or (at your option) any later
version.

This program 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 program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#ifndef _Ogre_ILUtil_H__
#define _Ogre_ILUtil_H__

#include "OgrePrerequisites.h"
#include "OgreCommon.h"
#include "OgrePixelFormat.h"

namespace Ogre {

    /* 
     * DevIL specific utility class
     **/    
    class _OgrePrivate ILUtil {
    public:
        /// Structure that encapsulates a devIL image format definition
                struct ILFormat {
                        /// Construct an invalidated ILFormat structure
                        ILFormat():
                                numberOfChannels(0), format(-1), type(-1) {};

                        /// Construct a ILFormat from parameters
                        ILFormat(int channels, int format, int type=-1):
                                numberOfChannels(channels), format(format), type(type) {}

                        /// Return wether this structure represents a valid DevIL format
                        bool isValid() { return format!=-1; }

                        /// Number of channels, usually 3 or 4
                        int numberOfChannels;
                        /// IL_RGBA,IL_BGRA,IL_DXTx, ...
                        int format;
                        /// IL_UNSIGNED_BYTE, IL_UNSIGNED_SHORT, ... may be -1 for compressed formats
                        int type;
                };

        /** Get OGRE format to which a given IL format can be most optimally converted.
         */
        static PixelFormat ilFormat2OgreFormat( int ImageFormat, int ImageType );
        /**     Get IL format that matches a given OGRE format exactly in memory.
                @remarks        Returns an invalid ILFormat (.isValid()==false) when
                        there is no IL format that matches this.
         */
        static ILFormat OgreFormat2ilFormat( PixelFormat format );      
        /** Convert current IL image to an OGRE format. The size of the target will be
                PixelUtil::getNumElemBytes(fmt) * ilGetInteger( IL_IMAGE_WIDTH ) * ilGetInteger( IL_IMAGE_HEIGHT ) * ilGetInteger( IL_IMAGE_DEPTH )
                The IL image type must be IL(_UNSIGNED_)BYTE or IL_FLOAT.
                The IL image format must be IL_RGBA, IL_BGRA, IL_RGB, IL_BGR, IL_LUMINANCE or IL_LUMINANCE_ALPHA
         
                @param tar       Target pointer
                @param ogrefmt   Ogre pixel format to employ
        */
        static void toOgre(const PixelBox &dst);

        /** Convert an OGRE format image to current IL image.
                @param src       Pixelbox; encapsulates source pointer, width, height, 
                                                 depth and format
        */
        static void fromOgre(const PixelBox &src);
    };

}

#endif