[fpc-devel] gtk2 bugfix gfloat

[Mattias Gaertner]

On Wed, 15 Jun 2005 09:20:48 +0200
Micha Nelissen <micha at neli.hopto.org> wrote:

> On Tue, 14 Jun 2005 23:33:17 +0200
> Mattias Gaertner <nc-gaertnma at netcologne.de> wrote:
> 
> > On Tue, 14 Jun 2005 22:34:19 +0200
> > Micha Nelissen <micha at neli.hopto.org> wrote:
> > 
> > > On Tue, 14 Jun 2005 22:11:40 +0200
> > > Mattias Gaertner <nc-gaertnma at netcologne.de> wrote:
> > > 
> > > > A c float is a fpc single, right?
> 
> So why did you do:
> 
> -   {$IFDEF KYLIX}
> -     gfloat = single;   //  Don't know why, but some routines requires
> this -   {$ELSE}
> -     gfloat = double;
> -   {$ENDIF}
> +   gfloat = double;
> 
> If you weren't using KYLIX, nothing has changed :S, shouldn't that be:
> 
> +   gfloat = single;
> 
> ?

You are right, I'm right, but my patch was insufficient.
Of course it must be single.

Marko Peric pointed me to a strange bug with some gtk2 examples translated
to pascal. After some debugging I saw, that with double it doesn't work, but
with single it works. According to the gtk2 sources and docs, gfloat must be
a c float. So definitely double is wrong and single works in my test cases.
I tested it with gtk2forpascal. But at the moment I have some trouble
building fpc and its rpms. Maybe the gfloat bug explains some of the strange
lazarus gtk2 interface bugs.
The reason, why this bug was not spotted before, is that the gtk2 always
bounds all gfloat input. This results in most cases to no effect, not even a
warning.


Mattias