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LibWeb: Implement CSS filter painting

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We can reuse our implementation for `backdrop-filter` and use it as a
painting filter for each stacking context.
This commit is contained in:
Jelle Raaijmakers 2024-10-25 15:37:21 +02:00 • committed by Andreas Kling
commit 1b9c50b664
Notes: github-actions[bot] 2024-10-26 09:28:48 +00:00
6 changed files with 162 additions and 129 deletions
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8
Userland/Libraries/LibWeb/Layout/Node.cpp
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@ -183,11 +183,13 @@ bool Node::establishes_stacking_context() const
if (parent() && parent()->display().is_grid_inside() && computed_values().z_index().has_value())
return true;
// https://drafts.fxtf.org/filter-effects/#FilterProperty
// https://drafts.fxtf.org/filter-effects-2/#backdrop-filter-operation
// A computed value of other than none results in the creation of both a stacking context [CSS21] and a Containing Block for absolute and fixed position descendants,
// unless the element it applies to is a document root element in the current browsing context.
// A computed value of other than none results in the creation of both a stacking context
// [CSS21] and a Containing Block for absolute and fixed position descendants, unless the
// element it applies to is a document root element in the current browsing context.
// Spec Note: This rule works in the same way as for the filter property.
if (!computed_values().backdrop_filter().is_none())
if (!computed_values().backdrop_filter().is_none() || !computed_values().filter().is_none())
return true;
// Element with any of the following properties with value other than none: