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c++wxwidgetsalphaalphablending

wxWidgets - Alpha blending

Is there a way in wxWidget to do alpha blending operations such as multiplying the alpha of a bitmap versus the RGB of other bitmap to generate new images (such as rendering a photo as an anti-aliased circular shape).

Solution

  • Though I haven't done alpha blending myself, I believe the wxGraphicContext is what you are after.

    http://docs.wxwidgets.org/stable/wx_wxgraphicscontext.html

    I've got flicker free drawing into the graphics context (on Win32) using the following in my paint event handler:

    void OnPaint( wxPaintEvent& e )
{
    wxBufferedPaintDC dc( this );        
    wxGraphicsContext* gdc = wxGraphicsContext::Create( dc );
    // you drawing code here
}

    EDIT: this email trail might offer some more insight:

    http://www.nabble.com/Is-alpha-blending-implemented-when-using-DC's--td17183159.html