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LibWeb: Support CSS property background-clip: text

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From https://drafts.csswg.org/css-backgrounds-4/#background-clip
"The background is painted within (clipped to) the intersection of the
border box and the geometry of the text in the element and its in-flow
and floated descendants"

This change implements it in the following way:
1. Traverse the descendants of the element, collecting the Gfx::Path of
   glyphs into a vector.
2. The vector of collected paths is saved in the background painting
   command.
3. The painting commands executor uses the list of glyphs to paint a
   mask for background clipping.

Co-authored-by: Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
This commit is contained in:
Zac Brannelly 2024-03-03 14:59:02 +11:00 • committed by Alexander Kalenik
parent 4a3680cafc
commit 9165faca5e
27 changed files with 353 additions and 105 deletions
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5
Userland/Libraries/LibWeb/CSS/StyleValues/RadialGradientStyleValue.cpp
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@ -207,12 +207,13 @@ bool RadialGradientStyleValue::equals(StyleValue const& other) const
return m_properties == other_gradient.m_properties;
}
void RadialGradientStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering) const
void RadialGradientStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering, Vector<Gfx::Path> const& clip_paths) const
{
VERIFY(m_resolved.has_value());
Painting::paint_radial_gradient(context, dest_rect, m_resolved->data,
context.rounded_device_point(m_resolved->center),
context.rounded_device_size(m_resolved->gradient_size));
context.rounded_device_size(m_resolved->gradient_size),
clip_paths);
}
}