[Lazarus] TColor and alpha channel

[Krzysztof]

I read about TFPColor, but this is record type and I can't publish
this kind of property type in object inspector, so I thought that
maybe exists some numerical type which include alpha. Ok so I must
create some wrapper which inherit from TPersistent.

2012/5/30 Mattias Gaertner <nc-gaertnma at netcologne.de>:
> On Wed, 30 May 2012 22:38:00 +0200
> Krzysztof <dibo20 at wp.pl> wrote:
>
>> Hi,
>>
>> Does TColor has alpha channel?
>
> No.
>
>> I am confused because wiki says that it
>> doesn't but delphi TColor has (I always thought that he doesn't have
>> too, maybe it is new Delphi 2010?). If not, maybe exists any
>> equivalent type or possibility write own TColorEx = longint which
>> include standard TColor and byte with alpha?
>
> TColor supports special colors:
>  clNone    = TColor($1FFFFFFF);
>  clDefault = TColor($20000000);
>  SYS_COLOR_BASE = TColorRef($80000000);
>  clScrollBar = TColor(SYS_COLOR_BASE or COLOR_SCROLLBAR);
>
> TFPColor supports RGB colors with alpha.
>
> Mattias
>
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