Questions about the font shaping tender

[Chris Sherlock]

Would it be helpful to look at the way that OutputDevice handles laying out text?

When I was looking at this code early last year I found that I had to try to understand what OutputDevice did before I could come even *close* to understanding what SalLayout was attempting. 

For instance, the DX array code looks suspiciously like it was adopted from the way that EMF (and I guess Windows GDI?) handles text layout. 

If I were to start a Wiki page, would that be at all helpful? It would be rough, but if others wanted to correct my mistakes and misunderstandings then could this be helpful in any way?

Chris

> On 2 Feb 2016, at 8:15 PM, Miklos Vajna <vmiklos at collabora.co.uk> wrote:
> 
> Hi,
> 
> I think the problem to solve is that we have different layout on Linux,
> Windows and OS X, which means it's next to impossible to write unit
> tests that assert the text is laid out correctly, since there can be
> small differences today. The hope is that this is the root cause of e.g.
> the chart tests which are not enabled by default today.
> 
> As far as I know, there are two ways you can solve this:
> 
> - use the Linux stack everywhere (fontconfig, freetype, harfbuzz?
>  something like that), IIRC that's what e.g. Chromium does
> - create a 4th layout in VCL, which is just a stub, but gives exactly
>  the same results in all platforms, to allow writing unit tests that
>  are executed in all platforms
> 
> Regards,
> 
> Miklos
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