Scrambled renderind with NotoSansTC-Regular.otf

[edouard-lopez]

related: opentypejs/opentype.js#273, opentypejs/opentype.js#243

I met rendering problems when using text-to-svg (shrhdk/text-to-svg#22, shrhdk/text-to-svg#23) with the NotoSansTC-Regular.otf.
Drilling down it appears text-to-svg is based on opentype.js.

Expected

This is for reference, I find that DroidSansFallbackFull.ttf worked fine.

key	value
font	DroidSansFallbackFull.ttf
text	㐅㐆丰wǔyǐnfēng

Actual (with NotoSans)

I tested on opentype.js online demo and the result is scramble too (see below):

key	value
font	NotoSansTC-Regular.otf
text	㐅㐆丰wǔyǐnfēng

[khaledhosny]

Have you tried other fonts with CFF table to rule out a general problem with such fonts?

[edouard-lopez]

@khaledhosny I only try DroidSansFallbackFull, could you suggest CJK fonts with CFF table as I'm not familiar with that ?

[khaledhosny]

Any .otf font, CJK or not.

[hugolpz]

The Noto CJK page exposes a large range of flavors, otc vs ttf, etc.

@edouard-lopez, in your example you compare DroidSansFallbackFull.ttf (TTF, working) to NotoSansTC-Regular.otf (OTF, buggy).

This image could be relevant.

[brawer]

The same font renders fine with FontView so this looks like a problem in OpenType.js.

[hugolpz]

OpenType.js process other fonts fine.