Re: Zooming the canvas messes up text

[Damon Chaplin <damon karuna eclipse co uk>]

On Sun, 2009-08-30 at 12:09 +0100, Damon Chaplin wrote:
> On Wed, 2009-08-26 at 11:16 +0100, Damon Chaplin wrote:
> > On Tue, 2009-08-25 at 19:38 -0700, Aditya Rajgarhia wrote:
> > > Hi,
> > > 
> > > I have noticed, both in my application as well as in the demos 
> > > distributed with GooCanvas, that zooming the canvas using set_scale() 
> > > can cause issues with any text on the canvas.
> > > 
> > > As the canvas is zoomed increasingly, some of the letters within a text 
> > > widget do not scale properly, and begin to overlap with each other. You 
> > > can see this in the examples/text demo application (by scaling the text 
> > > a few times), or in the following screenshot from my application: 
> > > http://img199.imageshack.us/img199/300/badtext.png
> > > 
> > > Has anyone come across this issue before? Unless I'm doing something 
> > > wrong, this is quite a bug.
> > 
> > I have noticed similar things before. I'd guess it is a Pango bug, as
> > GooCanvas doesn't have much to do with the layout of the letters in the
> > text.
> > 
> > It would be useful to try to reproduce it in a simple GTK+ app, and also
> > check if it is a known bug.
> 
> I've added a Pango bug and test case:
>   http://bugzilla.gnome.org/show_bug.cgi?id=593538
> 
> I'm not really sure where the problem is.

It turned out to be a known Pango kerning bug:
 http://bugzilla.gnome.org/show_bug.cgi?id=341481

Damon