Bug 221352 – Add support for hwb() colors defined in CSS Color 4

• Component: CSS
• Status: RESOLVED FIXED

[Sam Weinig]

We should add support for hwb() colors defined in CSS Color 4 - https://drafts.csswg.org/css-color/#the-hwb-notation.

[Sam Weinig]

Created attachment 419174 [details]
Patch

[EWS Watchlist]

This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess

[Sam Weinig]

Created attachment 419175 [details]
Patch

[Sam Weinig]

Don't be put off by the big patch size, most is the output of a wpt case.

[Darin Adler]

Comment on attachment 419175 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=419175&action=review

> Source/WebCore/css/parser/CSSPropertyParserHelpers.cpp:835
> +    CSSParserTokenRange args = consumeFunction(range);

auto?

> Source/WebCore/css/parser/CSSPropertyParserHelpers.cpp:888
> +    return convertTo<SRGBA<uint8_t>>(toSRGBA(HWBA<float> { static_cast<float>(normalizedHue), static_cast<float>(nomalizedWhiteness), static_cast<float>(nomalizedBlackness), static_cast<float>(*alpha) }));

I’m a little surprised a this:

    convertTo<SRGBA<uint8_t>>(toSRGBA(x))

I understand that we have to specify "uint8_t"; my surprise is that convertTo does not implicitly include the toSRGBA work.

[EWS]

Committed r272344: <https://trac.webkit.org/changeset/272344>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 419175 [details].

[Radar WebKit Bug Importer]

<rdar://problem/73952934>

[Sam Weinig]

(In reply to Darin Adler from comment #5)
> Comment on attachment 419175 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=419175&action=review
> 
> 
> > Source/WebCore/css/parser/CSSPropertyParserHelpers.cpp:888
> > +    return convertTo<SRGBA<uint8_t>>(toSRGBA(HWBA<float> { static_cast<float>(normalizedHue), static_cast<float>(nomalizedWhiteness), static_cast<float>(nomalizedBlackness), static_cast<float>(*alpha) }));
> 
> I’m a little surprised a this:
> 
>     convertTo<SRGBA<uint8_t>>(toSRGBA(x))
> 
> I understand that we have to specify "uint8_t"; my surprise is that
> convertTo does not implicitly include the toSRGBA work.

This is due to color space conversion (the toSRGBA()) and component type conversion (the convertTo<SRGBA<uint8_t>>()) being separate currently.

My plan is to make them into one thing, tentatively using the convertTo<> naming.

[Sam Weinig]

(In reply to Sam Weinig from comment #8)
> (In reply to Darin Adler from comment #5)
> > Comment on attachment 419175 [details]
> > Patch
> > 
> > View in context:
> > https://bugs.webkit.org/attachment.cgi?id=419175&action=review
> > 
> > 
> > > Source/WebCore/css/parser/CSSPropertyParserHelpers.cpp:888
> > > +    return convertTo<SRGBA<uint8_t>>(toSRGBA(HWBA<float> { static_cast<float>(normalizedHue), static_cast<float>(nomalizedWhiteness), static_cast<float>(nomalizedBlackness), static_cast<float>(*alpha) }));
> > 
> > I’m a little surprised a this:
> > 
> >     convertTo<SRGBA<uint8_t>>(toSRGBA(x))
> > 
> > I understand that we have to specify "uint8_t"; my surprise is that
> > convertTo does not implicitly include the toSRGBA work.
> 
> This is due to color space conversion (the toSRGBA()) and component type
> conversion (the convertTo<SRGBA<uint8_t>>()) being separate currently.
> 
> My plan is to make them into one thing, tentatively using the convertTo<>
> naming.

This is resolved in https://bugs.webkit.org/show_bug.cgi?id=221443.