Bug 94359

Summary:	[CI][CSS Masking] apply luminance mask to context
Product:	WebKit	Reporter:	Dirk Schulze <krit>
Component:	CSS	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	alexander, eoconnor
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:
Bug Blocks:	95389

Description Dirk Schulze 2012-08-17 10:14:23 PDT

CSS masking just supported alpha masks at the moment. For compatibility reasons to SVG and to support the general harmonization process with bug 90738, it looks reasonable to support luminance masks as well. This is currently described by the proposal for CSS Masking [1].

The old SVG masking code used to work with CI to transform a luminance mask to an alpha mask [2].

[1] http://dvcs.w3.org/hg/FXTF/raw-file/tip/masking/index.html#the-mask-type
[2] http://trac.webkit.org/browser/trunk/WebCore/svg/graphics/cg/SVGResourceMaskerCg.mm?rev=35895

Comment 1 Alex 2023-11-14 00:49:33 PST

Isn't it supported already since Safari 15.4?
https://caniuse.com/mdn-css_properties_mask-mode