Task 15: Text Improvements

[paulushub]

Complete the support of vertical texts
Complete the support of text paths
Complete multi-position and multi-angle-rotation of characters.

This work item was migrated from CodePlex

CodePlex work item ID: '421'
Vote count: '1'

[paulushub]

[jonfrost@2011/02/24]
This would be a great feature - down the road I will want this.

[paulushub]

[SelormeyPaul@2011/02/24]
Jon, you forgot to vote for it!

[paulushub]

[UnknownUser@2011/02/24]

[paulushub]

[jonfrost@2011/02/24]
I have done some work in this area - I can take this on after I finish the other task.

[paulushub]

[UnknownUser@2013/02/14]

[Pat28]

Improve vertical text support, glyph-orientation-vertical has been replaced by CSS text-orientation.
writing-mode: tb is no vertical-rl etc...

https://www.w3.org/TR/SVG/text.html#GlyphOrientationVerticalProperty

to

https://www.w3.org/TR/css-writing-modes-3/#text-orientation

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Sorry, your browser does not support inline SVG.

Hello 日㌀㌃

Hello 24 world1 日㌀㌃ Hello 24 world2 日㌀㌃ ` 

[paulushub]

@Pat28 I am really preparing for this feature. There is a real work involved here since much has changed; I have just added the WOFF2 support, will need direct parsing of the the font files to support both vertical metrics and emojis.
The main problem is I need to drop a feature in the current source; support for text rendering without converting the glyphs to path. This limits the current text rendering mode, but dropping it will break current applications, so I am planning to move these features SharpVectors 2.x.

[Pat28]

Do notice CJK characters can be rendered differently in vertical mode, there are specific glyphs for these 'words'.

[Pat28]

@Pat28 I am really preparing for this feature. There is a real work involved here since much has changed; I have just added the WOFF2 support, will need direct parsing of the the font files to support both vertical metrics and emojis. The main problem is I need to drop a feature in the current source; support for text rendering without converting the glyphs to path. This limits the current text rendering mode, but dropping it will break current applications, so I am planning to move these features SharpVectors 2.x.

will you include rendering support for both GDI+ and WPF etc?

[paulushub]

@Pat28 will you include rendering support for both GDI+ and WPF etc?

Yes, that is the plan. The GDI+ renderer uses only path geometry for text rendering, but limited by GDI+ font features support.
WPF has a better font support through DirectWrite, but lacking colored font or emoji (available on DirectWrite for Windows 10+, but not supported by WPF) and vertical text.
GDI+ has vertical text support, which works well for the vertical Japanese texts.

By directly parsing the font files, we can have a simple shaping framework for any graphics.

[Pat28]

Did you also have a look at SkiaSharp which is a lot faster on Windows in multi-threaded environments; it does not use GDI+ but its own in-memory rendering.
It seems to be using something called HarfBuzzSharp for rendering texts.

[paulushub]

@Pat28 Did you also have a look at SkiaSharp which is a lot faster on Windows in multi-threaded environments;

Yes, I have look into it. The initial support for SVG in the Skia library is limited, but there is a recent effort to extend it. I still do not know how far they will go with this.
There is also, Svg.Skia based on the SVG.NET and SkiaSharp.Extended. But I have not used any of these and cannot tell their feature sets.

I was considering the SkiaSharp to enable uses in web development, since MS stopped allowing WPF for such applications, but may go first with SharpDX (Direct2D + DirectWrite is faster than Skia + HarfBuzz) for Windows/Server applications.
SkiaSharp + HarfBuzzSharp is quite large, only those using Linux server may be interested.

Finally, I am following the progress on .NET 6.x and it graphics system to evaluate supports. Lots of work to do 🤣

[valhentai]

Hi, has there been any progress on the rendering of vertical text ?
I grabbed the 1.8.3 version to convert a Svg to a XAML drawing but the text with text-orientation:upright is still displayed horizontaly.
Do you have any idea of when it will be implemented ?