Re: freetype/harfbuzz-based multi-line paragraph layout in skia

Somehow funny to read that mail, beause that's pretty exactly the point 
[2] where my non-ft-based, dirty, low priority OMA sub-project [1] about 
typewriting currently hangs (besides of course a lot of more 
shortcomings, most notable here with gsub processing implementation, 
again some more topic that comes with a lot of reliance on MS design 
decisions and their documentation).

Luckily, a lot of the topic is unicode specified [3], so there isn't so 
much "freedom of choice"-burden on first sight (specificly if you treat 
dependence on harfbuzz fixed). Well, "luckily" assuming unicode is 
conservative enough about definitions.


[1] https://gitlab.com/janbruns/gui4pas/-/tree/main/imgsrc/ttf
[2] 
https://gitlab.com/janbruns/gui4pas/-/blob/main/imgsrc/parapgraphlayouter.pas
[3] 
https://gitlab.com/janbruns/gui4pas/-/blob/main/misc/unicode/paragraphmanager.pas


On 14.08.24 21:04, Hin-Tak Leung wrote:
> There was a recent enquiry about the availability of skia's 
> skparagraph functionality in skia-python, so I did some digging and 
> added that to the next skia-python release. (m129/130 in about two 
> months' time, when skia m130 get forked by google).
>
> For those who doesn't know what it is (that includes me two weeks 
> ago...), skia's skparagraph offers multi-line text layout, with a 
> variety of alignment options (left/right, centered, justified), and 
> decorations (underline/strikethrough). I guess that functionality is 
> probably somewhat equivalent to pango's role. Skia's skparagraph is 
> based on freetype/harfbuzz so can mostly "do the right thing" with the 
> middle-eastern languages on line-breaks, etc. Have a try with Arabic / 
> Hebrew etc if you feel like it. I did.
>
> This is mostly a RFC / request for testers etc. The main info and 
> source code is at https://github.com/kyamagu/skia-python/pull/258 , 
> and example program at 
> https://github.com/HinTak/skia-python-examples/blob/main/shape_text.py 
> . Prebuilt python wheels is at 
> https://github.com/kyamagu/skia-python/actions/runs/10355210169 for 
> the three major platforms, linux, windows, mac os x.
>
> The quickest way for people to try it out is simply download one of 
> the relevant wheels, install it, and play with the example. (edit it 
> with your own text for rendering, setting various options, then run 
> "shape_text.py chosen-font.ttf output.png").
>
> Note that most of the problems with documentations, and additional 
> functions, neither https://github.com/kyamagu/skia-python/ nor 
> https://github.com/HinTak/skia-python-examples/ is the correct place: 
> see https://issues.skia.org/358587937 and 
> https://issues.skia.org/307357528 - we basically replicate upstream's 
> API / documentations, so it needs to be in Google's skia repo first.
>
> Thanks for reading so far.