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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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12
Userland/Libraries/LibWeb/Painting/GradientPainting.cpp
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@ -146,19 +146,19 @@ RadialGradientData resolve_radial_gradient_data(Layout::NodeWithStyleAndBoxModel
return { resolved_color_stops };
}
void paint_linear_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, LinearGradientData const& data)
void paint_linear_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, LinearGradientData const& data, Vector<Gfx::Path> const& clip_paths)
{
context.recording_painter().fill_rect_with_linear_gradient(gradient_rect.to_type<int>(), data);
context.recording_painter().fill_rect_with_linear_gradient(gradient_rect.to_type<int>(), data, clip_paths);
}
void paint_conic_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, ConicGradientData const& data, DevicePixelPoint position)
void paint_conic_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, ConicGradientData const& data, DevicePixelPoint position, Vector<Gfx::Path> const& clip_paths)
{
context.recording_painter().fill_rect_with_conic_gradient(gradient_rect.to_type<int>(), data, position.to_type<int>());
context.recording_painter().fill_rect_with_conic_gradient(gradient_rect.to_type<int>(), data, position.to_type<int>(), clip_paths);
}
void paint_radial_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, RadialGradientData const& data, DevicePixelPoint center, DevicePixelSize size)
void paint_radial_gradient(PaintContext& context, DevicePixelRect const& gradient_rect, RadialGradientData const& data, DevicePixelPoint center, DevicePixelSize size, Vector<Gfx::Path> const& clip_paths)
{
context.recording_painter().fill_rect_with_radial_gradient(gradient_rect.to_type<int>(), data, center.to_type<int>(), size.to_type<int>());
context.recording_painter().fill_rect_with_radial_gradient(gradient_rect.to_type<int>(), data, center.to_type<int>(), size.to_type<int>(), clip_paths);
}
}