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LibWeb: Layout <svg> nested inside <svg>

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This is far from perfect, but let's at least make an attempt at laying
out <svg> when encountering it inside another <svg>.

This makes https://awesomekling.substack.com actually load and render
instead of asserting. :^)
This commit is contained in:
Andreas Kling 2023-04-18 19:32:00 +02:00
parent ec5d5918c4
commit ce5a939148
3 changed files with 29 additions and 3 deletions
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10
Tests/LibWeb/Layout/expected/svg/svg-inside-svg.txt Normal file
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@ -0,0 +1,10 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x40 children: not-inline
BlockContainer <body> at (8,8) content-size 784x24 children: inline
line 0 width: 24, height: 24, bottom: 24, baseline: 24
frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 24x24]
SVGSVGBox <svg> at (8,8) content-size 24x24 children: inline
SVGGraphicsBox <g> children: inline
SVGSVGBox <svg> at (8,8) content-size 24x24 children: not-inline
SVGGeometryBox <rect> at (8,8) content-size 24x24 children: not-inline
TextNode <#text>

12
Tests/LibWeb/Layout/input/svg/svg-inside-svg.html Normal file
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@ -0,0 +1,12 @@
<!doctype html><body><svg
width="24"
height="24"
viewBox="0 0 24 24"
xmlns="http://www.w3.org/2000/svg"
><g><svg
xmlns="http://www.w3.org/2000/svg"
width="24"
height="24"
viewBox="0 0 24 24"
><rect x="0" y="0" width="24" height="24"></svg></g>
</svg>

10
Userland/Libraries/LibWeb/Layout/SVGFormattingContext.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2023, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
@ -10,6 +10,7 @@
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/SVGFormattingContext.h>
#include <LibWeb/Layout/SVGGeometryBox.h>
#include <LibWeb/Layout/SVGSVGBox.h>
#include <LibWeb/SVG/SVGForeignObjectElement.h>
#include <LibWeb/SVG/SVGSVGElement.h>
@ -128,7 +129,7 @@ static ViewBoxTransform scale_and_align_viewbox_content(SVG::PreserveAspectRatio
return viewbox_transform;
}
void SVGFormattingContext::run(Box const& box, LayoutMode, [[maybe_unused]] AvailableSpace const& available_space)
void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, AvailableSpace const& available_space)
{
// FIXME: This a bunch of this thing is an ad-hoc hack.
@ -148,7 +149,7 @@ void SVGFormattingContext::run(Box const& box, LayoutMode, [[maybe_unused]] Avai
return IterationDecision::Continue;
});
box.for_each_in_subtree_of_type<SVGBox>([&](SVGBox const& descendant) {
box.for_each_in_subtree_of_type<Box>([&](Box const& descendant) {
if (is<SVGGeometryBox>(descendant)) {
auto const& geometry_box = static_cast<SVGGeometryBox const&>(descendant);
auto& geometry_box_state = m_state.get_mutable(geometry_box);
@ -184,6 +185,9 @@ void SVGFormattingContext::run(Box const& box, LayoutMode, [[maybe_unused]] Avai
geometry_box_state.set_content_offset(path_bounding_box.top_left());
geometry_box_state.set_content_width(path_bounding_box.width());
geometry_box_state.set_content_height(path_bounding_box.height());
} else if (is<SVGSVGBox>(descendant)) {
SVGFormattingContext nested_context(m_state, descendant, this);
nested_context.run(descendant, layout_mode, available_space);
}
return IterationDecision::Continue;