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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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4
Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
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@ -131,11 +131,11 @@ Optional<CSSPixelFraction> ImageStyleValue::natural_aspect_ratio() const
return {};
}
void ImageStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const
void ImageStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering, Vector<Gfx::Path> const& clip_paths) const
{
if (auto const* b = bitmap(m_current_frame_index, dest_rect.size().to_type<int>()); b != nullptr) {
auto scaling_mode = to_gfx_scaling_mode(image_rendering, b->rect(), dest_rect.to_type<int>());
context.recording_painter().draw_scaled_immutable_bitmap(dest_rect.to_type<int>(), *b, b->rect(), scaling_mode);
context.recording_painter().draw_scaled_immutable_bitmap(dest_rect.to_type<int>(), *b, b->rect(), scaling_mode, clip_paths);
}
}