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Operating System Specific Discussions => Amiga OS => Amiga OS -- Development => Topic started by: ChaosLord on August 06, 2011, 01:41:35 AM

Title: AmigaOS Gadgets support Alphablending?
Post by: ChaosLord on August 06, 2011, 01:41:35 AM

Plain Jane AmigaOS has no support for Alphablended Gadgets.

But I am wondering if P96 or CGX does support that?

I can't imagine that it would be possible since the alphablending would alter the background in unpredictable ways.

My GfxMage wants my AmigaOS Gadgets to cast shadows on 16M Color Screens.  To this end he has added several pixels of Alphablendiness to the gadgets.

I already told him that I didn't think it could work.

But I wanted to get a definitive answer from one of the experts lurking about on the org :)

Title: Re: AmigaOS Gadgets support Alphablending?
Post by: rzookol on August 06, 2011, 07:23:45 AM

Morphos and Aros and OS4 has WritePixelArrayAlpha(), You can try afaos + zune on OS3.x. Probably it will work.

Title: Re: AmigaOS Gadgets support Alphablending?
Post by: itix on August 06, 2011, 10:29:06 AM

If you mean vanilla Intuition struct Gadget you are out of luck. They only support 8-bit planar bitmap graphics.

If you use GUI engine you can use WritePixelArrayAlpha() or write your own alpha blending routine.