[Qt-interest] How enforce aspect ratio of QGLWidget in QLayout?

[Jason H]

Qxt's QxtLetterBox widget (container for any QWidget)




----- Original Message ----
From: Ed Sutton <ESutton at fescorp.com>
To: Qt-interest Interest <qt-interest at trolltech.com>
Sent: Fri, September 10, 2010 9:24:43 AM
Subject: [Qt-interest] How enforce aspect ratio of QGLWidget in QLayout?

When main window is resized, I want to enforce the aspect ratio of video 
displayed in a QGLWidget.  My first attempt implemented this in 
GLWidget::resizeGL() by adjusting the glViewport width and height.  This sort of 
worked but left black bars at either the top or side and when I changed channels 
to a new aspect ration video, it would not fix itself because no resize called.

I think the correct approach must be to control the size of the GLWidget rather 
than the glViewport.  Do I need to implement this is the BorderLayout that the 
GLWidget was added to?

Thanks in advance for any tips or direction,

-Ed

/// Widget to handle reception of video and render as a OpenGl 2-D texture
class GLWidget : public QGLWidget
{
protected:
   // storage for one texture - the video frame bitmap
   GLuint m_texture[1];
   int m_width;
   int m_height;
   void initializeGL();
   void paintGL();
   void resizeGL(int width, int height);
};


// Border layout contains a channel selector to the right of the video window
class BorderLayout : public QLayout
{
};
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