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LibWeb: Separate layout tree rendering into phases

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CSS defines a very specific paint order. This patch starts steering us
towards respecting that by introducing the PaintPhase enum with values:

- Background
- Border
- Foreground
- Overlay (internal overlays used by inspector)

Basically, to get the right visual result, we have to render the page
multiple times, going one phase at a time.
This commit is contained in:
Andreas Kling
2020-06-18 18:57:35 +02:00
parent abe811104f
commit cfab53903f
22 changed files with 109 additions and 95 deletions
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12
Libraries/LibWeb/Layout/LayoutDocument.cpp
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@@ -100,9 +100,17 @@ void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Gfx::IntRect& a_v
});
}
void LayoutDocument::render(RenderingContext& context)
void LayoutDocument::paint_all_phases(RenderingContext& context)
{
stacking_context()->render(context);
render(context, PaintPhase::Background);
render(context, PaintPhase::Border);
render(context, PaintPhase::Foreground);
render(context, PaintPhase::Overlay);
}
void LayoutDocument::render(RenderingContext& context, PaintPhase phase)
{
stacking_context()->render(context, phase);
}
}