On 15/08/2022 18:21, Tom Ritter wrote:
It looks like OTS does not support sanity-checking COLR[0] so I am
curious if we have fuzz coverage for this feature?
Not yet (at least not to my knowledge); it'd be good to get started on that.
Also, I am intending to look at adding COLR support to OTS, as an
element of defence-in-depth here.
JK
-tom
[0] https://github.com/khaledhosny/ots/issues/202
<https://github.com/khaledhosny/ots/issues/202>
On Mon, Aug 15, 2022 at 8:24 AM Jonathan Kew <[email protected]
<mailto:[email protected]>> wrote:
Summary:
COLRv1 is a new format for full-color OpenType fonts, building on the
original COLR (v0) format for simple colored layers and providing a
richer graphic model including gradients and transformations.
This format provides font designers with graphic expressiveness
comparable to SVG-in-OpenType, but with a much more concise and
efficient representation; it also provides new flexibility via the use
of OpenType variations to dynamically modify the glyphs.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1740525
<https://bugzilla.mozilla.org/show_bug.cgi?id=1740525>
Specification:
- https://docs.microsoft.com/en-gb/typography/opentype/spec/colr
<https://docs.microsoft.com/en-gb/typography/opentype/spec/colr>
- https://github.com/googlefonts/colr-gradients-spec
<https://github.com/googlefonts/colr-gradients-spec>
Standards Body:
Part of the OpenType (Microsoft) / Open Font Format (ISO SC29/WG3)
specs.
Platform coverage: All
Preference: gfx.font_rendering.colr_v1.enabled
DevTools bug: n/a
Other browsers:
- Blink: partial implementation (without variations support) shipping;
full implementation behind "Variable COLRv1 Fonts" flag in Canary.
- WebKit: no current plans AFAIK
web-platform-tests:
Not yet in place; experimental fonts for interoperability testing are
being created at https://github.com/googlefonts/color-fonts
<https://github.com/googlefonts/color-fonts>, and I
expect in due course an agreed test suite will emerge (though
interoperably testing the precise rendering of complex graphic
compositions is tricky...)
As an interim measure, I propose to include some basic reftests in our
tree, per https://phabricator.services.mozilla.com/D154586
<https://phabricator.services.mozilla.com/D154586>.
- Jonathan
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