On 15/08/2022 18:24, Christian Holler wrote:
> 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
We're not using freetype2's implementation (as we don't have freetype in
Gecko at all on Windows or macOS).
So in bug 1740530 there'll be new code landing (in
gfx/thebes/COLRFonts.{h,cpp}) to handle the COLR table; it'd be good to
have our fuzzers poking at that before it heads to release. (Initial
landing will be behind a pref, enabled by default only on Nightly.)
JK
>
> 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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