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Home » U++ Library support » Draw, Display, Images, Bitmaps, Icons » Alpha in Color
Alpha in Color [message #24807] Sat, 30 January 2010 23:08 Go to previous message
andrei_natanael is currently offline  andrei_natanael
Messages: 262
Registered: January 2009
Experienced Member
Is there any reason why Color doesn't have alpha component? It have but it can't be set i.e. Color(255, 123, 223, 128).
Also if converting from RGBA to Color i think it loose color value if alpha is 0 (Color.cpp:76);
Color::Color(RGBA rgba)
{
	if(rgba.a == 0)
		color = 0xffffffff;


IMO it should preserve colors from rgba even if alpha is 0; I was doing conversion from QPixmap (from Qt) to Image (Upp) in some test for my graduation thesis and i liked the idea to be able to fill QPixmap with a "transparent" color.
 
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