[haiku-development] Re: Disable BView antialiasing
- From: Stephan Assmus <superstippi@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 23 Sep 2009 09:38:52 +0200
On 2009-09-23 at 05:55:36 [+0200], Ryan Leavengood <leavengood@xxxxxxxxx>
wrote:
> On Tue, Sep 22, 2009 at 8:17 PM, Caitlin Shaw <rogueeve@xxxxxxxxxxxxx>
> wrote:
> >
> > I never noticed that, but it still isn't, actually, and also now that
> > you mention it the line is backwards! That is, it's a forward slash,
> > like "/", whereas the international No symbol is usually a backwards
> > slash.
>
> Hahaha, you are totally right, good catch! Though a quick search online
> shows both variations the backslash is the correct international version.
> To be fair it looks like we just got this from BeOS:
>
> http://www.guidebookgallery.org/pics/gui/settings/screensaver/beos5-1-1.png
>
> > I looked at the code and sure enough they are using StrokeEllipse and
> > StrokeLine--I'm surprised, I assumed it was just a bitmap.
> >
> > If you change the code from:
> >
> > size -= ceilf(sin(M_PI / 4) * size + 2);
> > rect.InsetBy(size, size);
> > StrokeLine(rect.RightTop(), rect.LeftBottom());
> >
> > to:
> >
> > rect.left += 3;
> > rect.top += 2;
> > rect.right -= (size / 8);
> > rect.bottom -= (size / 8);
> > StrokeLine(rect.LeftTop(), rect.RightBottom());
>
> I tried this code and it looks pretty good but there is a slight
> variation between the two symbols on each mini monitor. I guess this is
> the anti-aliasing at work again. Of course if you compare it to the above
> BeOS screenshot it definitely looks a lot better.
There are a number of problems that the drawing code needs to take care of
in the app_server. If you want to turn off all the work-arounds, just
specify B_SUB_PIXEL_PRECISE in the view flags. The problems are explained
in the comments of the app_server code (Painter.cpp).
> Regarding the topic of this thread, shouldn't there be a way to undo the
> antialiased line with the right combination of colors and drawing mode?
> In other words a sort of inverse antialias? If not maybe we could add
> something like that, assuming it is possible.
It's not possible, sorry.
Best regards,
-Stephan
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