Re: Alpha in Pango Color
- From: Behdad Esfahbod <behdad esfahbod gmail com>
- To: Matthias Clasen <mclasen redhat com>, William Kappler <wekapple ncsu edu>, gtk-i18n-list gnome org
- Subject: Re: Alpha in Pango Color
- Date: Tue, 11 Aug 2015 16:37:37 +0200
On 15-08-11 03:58 PM, Matthias Clasen wrote:
On Sat, 2015-08-08 at 11:36 +0200, Behdad Esfahbod wrote:
Hi William,
Currently Pango doesn't support alpha in colors. At this point, it
might make
sense to add a separate PANGO_ATTR_ALPHA, instead of an RGBA type.
I'd take a patch. Matthias, is this something you can possibly
implement?
Shouldn't take long to implement and test...
No, sorry. Not in the short term. But I would be interested in having
alpha support in pango, and would look at making GTK+ use it if it
appears.
If we make this a separate attribute, we would need fg-alpha, bg-alpha,
strikethrough-alpha and underline-alpha. And there would be some
complication where you could end up with (say) the underline-color and
underline-alpha attributes ending at different positions. We would fall
back to fg for the underline color where underline-color has ended. But
do we combine it with the underline-alpha? Maybe that is just a corner
-case that needs clear documentation.
Hum.. We definitely don't want four alpha attributes. Are there realistic
usecases for needing different alpha for those? I guess different alha for
background vs foreground makes a lot of sense...
b
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