Re: [fxtf-drafts] [css-compositing-2] Add lighter composite operator to mix-blend-mode (#445)

The CSS Working Group just discussed `Add lighter composite operation`, and agreed to the following:

* `RESOLVED: Add plus-lighter and plus-darker to mix-blend-mode in Compositing 2.`

<details><summary>The full IRC log of that discussion</summary>
&lt;TabAtkins> Topic: Add lighter composite operation<br>
&lt;TabAtkins> github: https://github.com/w3c/fxtf-drafts/issues/445<br>
&lt;smfr> q+<br>
&lt;TabAtkins> vmpstr: We'd like to add a plus-lighter to mix-blend-mode, and smfr says WebKit already supports plus-lighter and plus-darker<br>
&lt;TabAtkins> vmpstr: They're comp operations, not blend, so they'd work in the same way that canvas works, where if you set a blend mode the comp op is src-over; if you set a comp op the blend mode is normal<br>
&lt;Rossen_> ack smfr<br>
&lt;chris> q+<br>
&lt;TabAtkins> smfr: Issue says lighter, bu tyou're asking for plus-lighter?<br>
&lt;TabAtkins> vmpstr: I think the diff is just whether the color is clamped to 1<br>
&lt;TabAtkins> vmpstr: Okay for our use-case either way<br>
&lt;TabAtkins> smfr: Preferable to me, because our graphics framework doesn't support lighter. plus-lighter is fine<br>
&lt;TabAtkins> vmpstr: That's fine for us, yes.<br>
&lt;Rossen_> ack chris<br>
&lt;TabAtkins> chris: Good to see the alignment between CSS and Canvas as well.<br>
&lt;TabAtkins> chris: This'll be in Compositing 2? Have we had FPWD?<br>
&lt;TabAtkins> Rossen_: Don't think so<br>
&lt;TabAtkins> chris: Okay to request that?<br>
&lt;TabAtkins> Rossen_: Resolve on this issue first.<br>
&lt;TabAtkins> Rossen_: Objectiosn to adding plus-lighter and plus-darker?<br>
&lt;TabAtkins> RESOLVED: Add plus-lighter and plus-darker to mix-blend-mode in Compositing 2.<br>
&lt;TabAtkins> fantasai: Might want to give a chance to review, so fpwd next year.<br>
&lt;TabAtkins> Rossen_: Yeah, let's call for it next y ear.<br>
</details>


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Received on Wednesday, 15 December 2021 18:52:44 UTC