Re: Issues with GDI Scaling in Windows

I need to correct my statement from the initial post about SciTE seemingly 
not showing ligatures even when I had an appropriate font set. I thought I 
had set my base font to Fira Code, but may have not saved the global 
properties file or perhaps I had the technology still on Default. I am 
seeing ligatures in SciTE just fine when configured properly.

Thanks,
Michael

On Tuesday, August 20, 2024 at 10:42:35 AM UTC-4 Michael Staszewski wrote:

> 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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