GDI itself does not support alpha-blending on vector elements (text, primitive shapes,...). Text cannot be drawn using alpha-blending by GDI (GDI+). One solution is create a bitmap, draw text on it and then alpha-blend bitmap to second bitmap or screen. The Second solution is to create your own alpha-blending routine but In this case, you'd need to handle text drawing all by yourself and do some complex polygon filling which is far from easy.
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