Re: Issues with GDI Scaling in Windows

Thank you for the information. We have opted to move forward with 
DirectWrite which resolves everything and enables font ligatures for 
supporting fonts. Eventually we will move to DPI Awareness, but we use 
Delphi which has some core issues with the newer awareness options at the 
moment.

Michael

On Tuesday, August 20, 2024 at 8:44:09 AM UTC-4 Neil Hodgson wrote:

> Michael Staszewski:
>
> > Our application uses GDI Scaling which can be configured by compiler 
> option or by overriding the High DPI scaling behavior of the executable and 
> setting it to System (Enhanced).
>
> I recommend DPI aware mode and it's less likely that fixes and 
> improvements will be made to scaling.
>
> > With some font/size combinations and when the technology property is set 
> to SC_TECHNOLOGY_DEFAULT there are various issues including...
>
> SC_TECHNOLOGY_DIRECTWRITE is now the focus of development effort.
>
> > … however, the DirectWrite technologies enable font ligatures.
> > 
> > We surface Font Ligatures as an option in our product and when enabled 
> we use DirectWrite; when disabled we use the Default technology. SciTE 
> doesn't appear to show ligatures when using a suitable font (Fira Code) and 
> I don't see an option for disabling it.
>
> SciTE has a "technology" setting corresponding to the API mentioned above.
>
> > • Is this GDI Scaling issue a defect or just a known issue/limitation?
>
> While there is some misplacement for me, it is weaker than the images. The 
> System and Application modes appear better than System (Enhanced).
>
> It can be considered a defect if you want but that doesn't mean that 
> anyone will fix it. There are better supported modes that should be 
> preferred.
>
> > • Is there a way to disable font ligatures and still use the DirectWrite 
> API?
>
> It is likely that IDWriteTypography::AddFontFeature in conjunction with a 
> feature tag like DWRITE_FONT_FEATURE_TAG_DISCRETIONARY_LIGATURES may 
> control this. For Scintilla, there would have to be some abstraction to 
> produce a cross-platform API. There have been similar requests before, 
> including one for surfacing pango_attr_font_features_new for use on GTK.
>
> Neil

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