Hi Donald, Have you gone through your code with a debugger at all? Check what value of nHalfSrcHeight you are getting.
One fix to your code you could do would be to use /2 rather *0.5 as /2 can use integer maths, while *0.5 requires pImageSrc->t() to be automatically promoted to a float for it work. Robert. On Wed, Apr 22, 2009 at 5:57 PM, Donald Cipperly <[email protected]> wrote: > Hi Robert, > > I'm trying to copy the top half of an existing image using osg::copyImage. > I do this as such: > > // Read in source image > osg::ref_ptr< osg::Image > pImageSrc = osgDB::readImageFile( "test.jpg" > ); > int nHalfSrcHeight = (int)(pImageSrc->t() * 0.5); > > // Allocate destination image > osg::Image *pImageDest = new osg::Image(); > pImageDest->allocateImage(pImageSrc->s(), nHalfSrcHeight, > pImageSrc->r(), pImageSrc->getPixelFormat(), pImageSrc->getDataType()); > > // Copy top half of source image to destination > myCopyImage( pImageSrc.get(), 0, (nHalfSrcHeight-1), 0, pImageSrc->s(), > nHalfSrcHeight, pImageSrc->r(), > pImageDest, 0, 0, 0, false ); > > > This appears to be the correct way to perform this operation. Is this > correct? If so, then line 210 of osg/ImageUtils.cpp appears to be incorrect > as it notifies that my input height is too large. And indeed when I commend > out the block below in ImageUtils.cpp, then it outputs the top half of my > image as I expect. > > if ((src_t+height) > (dest_t + destImage->t())) > { > osg::notify(osg::NOTICE)<<"copyImage("<<srcImage<<", "<<src_s<<", > "<< src_t<<", "<<src_r<<", "<<width<<", "<<height<<", "<<depth<<std::endl; > osg::notify(osg::NOTICE)<<" "<<destImage<<", "<<dest_s<<", > "<< dest_t<<", "<<dest_r<<", "<<doRescale<<")"<<std::endl; > osg::notify(osg::NOTICE)<<" input height too large."<<std::endl; > return false; > } > > Thanks for any help you can provide, > > Donny > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
