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Re: images / alpha-blending

From: YAMAMOTO Mitsuharu
Subject: Re: images / alpha-blending
Date: Sun, 19 Feb 2006 16:22:59 +0900
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/22.0.50 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

>>>>> On Sat, 18 Feb 2006 10:00:33 +0000, David Reitter <address@hidden> said:

> I am trying to use a few new icons for the tool-bar and after a bit
> of fruitless research, I have the impression that alpha-blending is
> not supported. I can only use bitmasks, even with image types such
> as PNG that have an alpha channel. Is that correct?

It would work as expected only when :background is given explicitly.
Otherwise, transparent parts are merged with the frame background


> (I have only tried this with the Carbon port, but I understand that
> X11 currently doesn't support alpha-blending anyways.)

I have some experimental code of alpha channel support for the Carbon
port using Quartz 2D, but I have the impression that full alpha
channel support is a post-release issue from the above post.  ("22.1"
didn't mean the next release there.)

                                     YAMAMOTO Mitsuharu

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