Test the built result? about twemoji-colr HOT 8 CLOSED

In principle, the "correct" thing to test would be to paint each supported character on a using the web font, and then compare the rendering to the original SVG image. (It won't be pixel-perfect, in general, for a number of reasons, but should be close enough that we can verify it with a "fuzzy match" of some kind.)

Another thing that might be useful would be to generate a test page that simply renders the glyphs from the converted font and the original SVGs side-by-side in a long table, for visual comparison.

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The browser JS has no access to rendered SVG, only chrome JS has that access. I will work on a visual comparison & a if-render-differently-than-system-emoji test script first.

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The browser JS has no access to rendered SVG, only chrome JS has that access.

This is wrong. ctx.drawImage() should be able to take a same origin img with an svg source, although I have not successfully make it work for some reason...

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Hmm. I think we're up against another issue here, too... it seems that Gecko's text rendering doesn't support layered-color fonts. (Nor does it support SVG-in-OT glyphs, so that alternative implementation wouldn't help.)

If I try rendering emoji with Segoe UI Emoji in , for example, I just get the B/W glyphs. (And currently, the EmojiOne font created here doesn't include B/W glyphs at all, so it would just render blank.) Similarly, Firefox Emoji renders B/W glyphs only (and its B/W glyphs are not usable as they stand).

Looks like we need to address that in Gecko before a -based test will be possible here. And in any case, it's a bug we ought to fix. Though how color-font technologies such as color layers or SVG-in-OT ought to interact with text features (e.g. fill patterns) may be a question...

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Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1274936 for the Gecko issue.

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WIP can be found at #6 -- Not sure why GitHub did not reference the two issues.

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Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1274936 for the Gecko issue.

Thanks for filing!

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Fixed by #6 and subsequent commits. Don't over do it!

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