grabWidget

[mickey]

Hi,
I need to grab only my QGLWidget. but grabWidget take only QWidget?
This below grab only a gray square!

QPixmap qp = QPixmap::grabWidget(myGLWidget, 0,0, -1, -1);

QPixmap qp = QPixmap::grabWidget(myGLWidget, 0,0, -1, -1);

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Is there a way or I must use grabWindow?

[jacek]

Use QGLWidget::renderPixmap().

[mickey]

the problem of this function is that (I read) will start initalizeGL, paintGL() etc...and after this call my contextGL() changes! There are some problem. I don't know if are there ways to avoid this...

I tried use grabWindow.it grab all widget are on my interest widget But very problem of this is that it grab also a QMessageBox::warning that is launched a bit before of grabbing. How can I avoid this?

Thanks

[jacek]

the problem of this function is that (I read) will start initalizeGL, paintGL() etc...and after this call my contextGL() changes! There are some problem. I don't know if are there ways to avoid this...

Why do you want avoid this? If you implement these methods properly you shouldn't have any problems.

I tried use grabWindow.it grab all widget are on my interest widget But very problem of this is that it grab also a QMessageBox::warning that is launched a bit before of grabbing. How can I avoid this?

In Qt3 QGLWidget bypasses the Qt painting engine, so you must use QGLWidget::renderPixmap(). You can also try to make a screenshot.

[mickey]

Why do you want avoid this? If you implement these methods properly you shouldn't have any problems.

my texture are destroyed after renderPixmap! If I use grabWindow this not happen.....

[jacek]

my texture are destroyed after renderPixmap! If I use grabWindow this not happen.....

How do you initialize those textures?

[mickey]

yes, in initalializeGL()

[jacek]

yes, in initalializeGL()

But how do you initialize those textures?

[mickey]

//initializeGL()
per.myinitGL();		
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glDisable(GL_TEXTURE_2D);

//initializeGL()
per.myinitGL();		
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glDisable(GL_TEXTURE_2D);

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perc::myInitGL() {
 glGenTextures(1, &tex);
 QImage img;	
 if ( !img.load(texFileName)) {	
   QImage buf;
   buf.fill(Qt::gray.rgb() );
   img=buf;			
 }
    QImage tx = QGLWidget::convertToGLFormat (img);
    glBindTexture(GL_TEXTURE_2D, tex);
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3, tx.width(), tx.height(), GL_RGBA,     GL_UNSIGNED_BYTE, tx.bits() );
}

perc::myInitGL() {
 glGenTextures(1, &tex);
 QImage img;	
 if ( !img.load(texFileName)) {	
   QImage buf;
   buf.fill(Qt::gray.rgb() );
   img=buf;			
 }
    QImage tx = QGLWidget::convertToGLFormat (img);
    glBindTexture(GL_TEXTURE_2D, tex);
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3, tx.width(), tx.height(), GL_RGBA,     GL_UNSIGNED_BYTE, tx.bits() );
}

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Is it ok? It seems works properly....

[jacek]

Is it ok? It seems works properly....

Every time initializeGL() is called, per.myinitGL() will overwrite the tex variable. Maybe it will be enough, if you check whether initializeGL() is called for the first time and only then call per.myinitGL()?

What is that "per" object?

[mickey]

'per' is my object on I put texture...a square; Are you saying me that when I call renderpixmap(), initializeGL() starts and tex is overwrite? (But tex should be the same before......).
But what is the advantage for renderPixmap() of re-call initializeGL and PaintGL()? Isn't it a time lose?