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LibWeb: Fill the whole viewport with the correct background color

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CSS2 tells us to use the HTML element's background color if not
transparent. Otherwise, the BODY element's background color.
This commit is contained in:
Andreas Kling 2022-03-23 17:36:25 +01:00
parent ca85ac26d4
commit e0c7727934
2 changed files with 16 additions and 13 deletions
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27
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -489,21 +489,24 @@ void Document::tear_down_layout_tree()
m_layout_root = nullptr;
}
Color Document::background_color(const Palette& palette) const
Color Document::background_color(Gfx::Palette const& palette) const
{
auto default_color = palette.base();
auto* body_element = body();
if (!body_element)
return default_color;
// CSS2 says we should use the HTML element's background color unless it's transparent...
if (auto* html_element = this->html_element(); html_element && html_element->layout_node()) {
auto color = html_element->layout_node()->computed_values().background_color();
if (color.alpha())
return color;
}
auto* body_layout_node = body_element->layout_node();
if (!body_layout_node)
return default_color;
// ...in which case we use the BODY element's background color.
if (auto* body_element = body(); body_element && body_element->layout_node()) {
auto color = body_element->layout_node()->computed_values().background_color();
if (color.alpha())
return color;
}
auto color = body_layout_node->computed_values().background_color();
if (!color.alpha())
return default_color;
return color;
// If both HTML and BODY are transparent, we fall back to the system's "base" palette color.
return palette.base();
}
Vector<CSS::BackgroundLayerData> const* Document::background_layers() const