We've looked into this and Tyson pointed out to me that freetype2 has
fuzz coverage for this feature on oss-fuzz:
https://github.com/freetype/freetype2-testing/tree/master/fuzzing#colrv1-methods
If there is other code we should look at, please let us know.
- Chris
On 15.08.22 19:21, 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?
-tom
[0] https://github.com/khaledhosny/ots/issues/202
On Mon, Aug 15, 2022 at 8:24 AM Jonathan Kew <[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
Specification:
- https://docs.microsoft.com/en-gb/typography/opentype/spec/colr
- 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, 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.
- Jonathan
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