QPixmap transparancy

[ian]

Hi,

I am trying to load a .BMP file into a QPixmap and then retrieve a HBITMAP handle so I can to do some Windows specific stuff. However, when I do this I am still seeing the background colour. How do I go about masking out the background colour in the pixmap?

At present I am attempting this:

QPixmap telescopePixmap( ":/images/Tscpblue.bmp" );
m_telescopeImage = telescopePixmap.toWinHBITMAP( QPixmap::PremultipliedAlpha );

QPixmap telescopePixmap( ":/images/Tscpblue.bmp" );
m_telescopeImage = telescopePixmap.toWinHBITMAP( QPixmap::PremultipliedAlpha );

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[ian]

I got this sorted out. It just needed the extra line of code as follows:

QPixmap telescopePixmap( ":/images/Tscpblue.bmp" );
telescopePixmap.setMask( telescopePixmap.createHeuristicMask() );
m_telescopeImage = telescopePixmap.toWinHBITMAP( QPixmap::PremultipliedAlpha );

QPixmap telescopePixmap( ":/images/Tscpblue.bmp" );
telescopePixmap.setMask( telescopePixmap.createHeuristicMask() );
m_telescopeImage = telescopePixmap.toWinHBITMAP( QPixmap::PremultipliedAlpha );

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[wysota]

Don't you just love it when people solve their problems on their own?

[ian]

Yes. Sometimes just talking it through does the trick