[osg-users] To Convert QImage to OSG::Image

[manish Choudhary]

Hi,

In my application I required to convert QImage to osg::Image to use that as a texture to wrap it on model.
What is the best way to convert QImage to Osg::Image ?


Thank you!

Cheers,
manish

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http://forum.openscenegraph.org/viewtopic.php?p=61976#61976





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[Gianni Ambrosio]

Hi Manish,
I'm just struggling with the same problem. I found on internet (maybe in this forum) a code example and I implemented the following method:


Code:
osg::Image* convertImage(const QImage& iImage)
{
osg::Image* osgImage = new osg::Image();
if (false == iImage.isNull()) {
QImage glImage = QGLWidget::convertToGLFormat(iImage);
if (false == glImage.isNull()) {
unsigned char* data = new unsigned char[glImage.byteCount()];
for(int i=0; i < glImage.byteCount(); ++i) {
data[i] = glImage.bits()[i];
}
osgImage->setImage(glImage.width(), glImage.height(), 1, 4, GL_RGBA, GL_UNSIGNED_BYTE, data, osg::Image::USE_NEW_DELETE, 1);
}
}
return osgImage;
}



Anyway, in my case this is not working well. A part from that, I'm not sure about "data" lifecycle.

Moreover, looking at

<OpenSceneGraph>\src\osgQt\QGraphicsViewAdapter.cpp

you can find around informations on how to implement it. I'm currently investigating.

Cheers,
Gianni

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=61977#61977

[Julien Valentin]

Hi,
Here's some old code i used..
Ther Problem is that it only work for RGBA16F image..I recommend to make usage specific code...unless you're ready to map all osg pixelformats to Qt's;

Code:
void ManagedImage::load(const QImage&im){

for( int row=0;( int )row<im.width();row++)
for( int col=0;( int )col<im.height();col++){


setData(row,col,0,QColor(im.pixel(row,col)).redF());

setData(row,col,1,QColor(im.pixel(row,col)).greenF());
setData(row,col,2,QColor(im.pixel(row,col)).blueF());
setData(row,col,3,QColor(im.pixel(row,col)).alphaF());

}
}
QImage & ManagedImage::toQImage(){
QColor color;
QImage im(QSize(Width(),Height()),QImage::Format_RGBA32);
float pix;
for( int row=0;( int )row<Width();row++)
for( int col=0;( int )col<Height();col++){
color.setRgbF(0,pix,0);
im.setPixel(row,col,(int )(color.rgb()));

}
return im;
}


...

Thank you!

Cheers,
Julien

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=61978#61978

[Jason MacDonald]

Here is my method:

QImage glimg(QGLWidget::convertToGLFormat(img->image())); //image() is the QImage
osg::Image* osgImg = new osg::Image;
unsigned char* bits = new unsigned char[glimg.byteCount()];
memcpy(bits, glimg.bits(),glimg.byteCount());
osgImg->setImage(img->pixelWidth(), img->pixelHeight(), 1, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, bits, osg::Image::USE_NEW_DELETE);

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[manish Choudhary]

Hi,

Thanks a lot.. all of the method suggested is working in my application.

Thank you!

Cheers,
manish

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=61980#61980