OSGGrabForeground.cpp

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/*---------------------------------------------------------------------------*\
 *                                OpenSG                                     *
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/*---------------------------------------------------------------------------*\
 *                                License                                    *
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 * This library is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU Library General Public License as published    *
 * by the Free Software Foundation, version 2.                               *
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 * 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         *
 * Library General Public License for more details.                          *
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/*---------------------------------------------------------------------------*\
 *                                Changes                                    *
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\*---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>

#include <OSGConfig.h>

#include <OSGGL.h>

#include <OSGNodePtr.h>
#include <OSGViewport.h>
#include <OSGImage.h>

#include "OSGGrabForeground.h"

OSG_USING_NAMESPACE


/***************************************************************************\
 *                            Description                                  *
\***************************************************************************/

/*----------------------- constructors & destructors ----------------------*/

GrabForeground::GrabForeground(void) :
    Inherited()
{
    Inherited::setActive(false);
}

GrabForeground::GrabForeground(const GrabForeground &source) :
    Inherited(source)
{
}

GrabForeground::~GrabForeground(void)
{
}

/*----------------------------- class specific ----------------------------*/

void GrabForeground::initMethod (void)
{
}

void GrabForeground::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
}

void GrabForeground::dump(      UInt32    , 
                         const BitVector ) const
{
    SLOG << "Dump GrabForeground NI" << std::endl;
}


void GrabForeground::draw(DrawActionBase *, Viewport *port)
{
    if(getActive() == false)
        return;
    
    ImagePtr i = getImage();
    
    if(i == NullFC)       // No image, no grab.
        return;

    UInt32 w = osgMax(2, port->getPixelWidth());
    UInt32 h = osgMax(2, port->getPixelHeight());
    
    // If image is smaller than 2x2, resize it to vp size
    // the 2x2 is because you can't create 0x0 images
    // If autoResize then update img size if vp changed
    if ( (i->getWidth() <= 1 || i->getHeight() <= 1) ||
         (getAutoResize() && (w != i->getWidth() || h != i->getHeight())) )
    {
        i->set(i->getPixelFormat(), w, h);
    }
    
    bool storeChanged = false;

    if ( !getAutoResize() )
    {
        w = osgMin(i->getWidth(),  port->getPixelWidth());
        h = osgMin(i->getHeight(), port->getPixelHeight());
        
        if (i->getWidth() != port->getPixelWidth())
        {
            glPixelStorei(GL_PACK_ROW_LENGTH, i->getWidth());
            storeChanged = true;
        }
    }
    
    glReadPixels(port->getPixelLeft(), port->getPixelBottom(), 
                 w, h, i->getPixelFormat(),
                 i->getDataType(), i->getData());

    if(storeChanged)
        glPixelStorei(GL_PACK_ROW_LENGTH, 0);
}


/*-------------------------------------------------------------------------*/
/*                              cvs id's                                   */

#ifdef __sgi
#pragma set woff 1174
#endif

#ifdef OSG_LINUX_ICC
#pragma warning( disable : 177 )
#endif

namespace
{
    static char cvsid_cpp[] = "@(#)$Id: $";
    static char cvsid_hpp[] = OSGGRABFOREGROUND_HEADER_CVSID;
    static char cvsid_inl[] = OSGGRABFOREGROUND_INLINE_CVSID;
}

---