[MPEG-OTSPEC] Skia-based ot-svg renderer hook to freetype

Cosimo Lupo cosimo at anthrotype.com
Tue Jul 4 20:56:07 CEST 2023

Hin-Tak, what do you mean by "Google OT-SVG fonts"? They're only one OT-SVG

On Tue, 4 Jul 2023, 19:15 Hin-Tak Leung, <htl10 at users.sourceforge.net>

> (Cross-posted to freetype-devel)
> It seems that skia itself has all the rsvg equivalent to implement the
> ot-svg renderer callback hooks in freetype, but skia-python is missing the
> python equivalent of SKSVGDOM::renderNode() . This means that if I re-write
> the rsvg-based python svgrender hooks with skia-python, it would only work
> with Adobe/Mozilla OT-SVG fonts, but not Google OT-SVG fonts (until
> skia-python improves).
> I think I'll give it a go and try to put an example out under
> freetype-py/examples (probably will call it "ot-svg-example-skia.py", after
> the other "ot-svg-example.py") . If the Freetype folks want to port to
> freetype2-demos, and add the missing renderNode() to support all OT-SVG (I
> mean Google OT-SVG fonts...) with a different svg rendering engine than
> rsvg, they can fish it out of freetype-py/examples ... :-).
> On Tuesday, 4 July 2023 at 21:58:10 GMT+8, Hin-Tak Leung <
> htl10 at users.sourceforge.net> wrote:
> On Tuesday, 4 July 2023 at 21:30:56 GMT+8, Dominik Röttsches <
> drott at google.com> wrote:
> > ... I don't think it would be the right architectural choice to
> redundantly repeat these concepts inside FreeType itself. Even more so, as
> fast compositing and gradient implementations require time and effort to
> make them reasonably fast.
> It isn't repeating these concepts in Freetype. Currently, in one (actually
> two, c and python) implementation, Freetype farms off rendering of OT-SVG
> glyphs to rsvg, which in turn is cairo-based, to do the actual rendering.
> FreeType just provides a plug-in system which allows an external library to
> do the rendering. Basically Freetype gives out the glyph svg outlines etc,
> and the external library fill in the extent and the actual buffer of a
> rendered bitmap. This allows any freetype-based applications to use OT-SVG
> fonts.
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