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LibWeb: Use viewbox attribute in SVG symbol element

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Previously when a viewBox was passed to a SVG symbol element it would
not be taken into account when drawing the SVG.
This commit is contained in:
Tom 2023-07-31 18:37:44 +02:00 committed by Andreas Kling
parent 9f73fc87a8
commit e61fdd1dc6
Notes: sideshowbarker 2024-07-17 06:33:00 +09:00 
Author: https://github.com/martinfalisse
Commit: https://github.com/SerenityOS/serenity/commit/e61fdd1dc6
Pull-request: https://github.com/SerenityOS/serenity/pull/20284
9 changed files with 67 additions and 4 deletions
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20
Tests/LibWeb/Layout/expected/svg/svg-symbol-with-viewbox.txt Normal file
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@ -0,0 +1,20 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x150 children: not-inline
BlockContainer <(anonymous)> at (8,8) content-size 784x0 children: inline
TextNode <#text>
TextNode <#text>
BlockContainer <div> at (8,8) content-size 784x150 children: inline
line 0 width: 300, height: 150, bottom: 150, baseline: 150
frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 300x150]
TextNode <#text>
SVGSVGBox <svg> at (8,8) content-size 300x150 [SVG] children: inline
TextNode <#text>
InlineNode <use>
InlineNode <symbol#braces>
TextNode <#text>
SVGGeometryBox <path> at (92.375,26.75) content-size 131.25x112.140625 children: inline
TextNode <#text>
TextNode <#text>
TextNode <#text>
TextNode <#text>

13
Tests/LibWeb/Layout/input/svg/svg-symbol-with-viewbox.html Normal file
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@ -0,0 +1,13 @@
<body>
<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
<symbol id="braces" viewBox="0 0 16 16">
<path
d="M2.114 8.063V7.9c1.005-.102 1.497-.615 1.497-1.6V4.503c0-1.094.39-1.538 1.354-1.538h.273V2h-.376C3.25 2 2.49 2.759 2.49 4.352v1.524c0 1.094-.376 1.456-1.49 1.456v1.299c1.114 0 1.49.362 1.49 1.456v1.524c0 1.593.759 2.352 2.372 2.352h.376v-.964h-.273c-.964 0-1.354-.444-1.354-1.538V9.663c0-.984-.492-1.497-1.497-1.6zM13.886 7.9v.163c-1.005.103-1.497.616-1.497 1.6v1.798c0 1.094-.39 1.538-1.354 1.538h-.273v.964h.376c1.613 0 2.372-.759 2.372-2.352v-1.524c0-1.094.376-1.456 1.49-1.456V7.332c-1.114 0-1.49-.362-1.49-1.456V4.352C13.51 2.759 12.75 2 11.138 2h-.376v.964h.273c.964 0 1.354.444 1.354 1.538V6.3c0 .984.492 1.497 1.497 1.6z">
</path>
</symbol>
</svg>
<div>
<svg>
<use xlink:href="#braces"></use>
</svg>

2
Userland/Libraries/LibWeb/Layout/SVGFormattingContext.cpp
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@ -159,7 +159,7 @@ void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, Available
auto path_transform = dom_node.get_transform();
double viewbox_scale = 1;
auto maybe_view_box = svg_svg_element.view_box();
auto maybe_view_box = dom_node.view_box();
if (maybe_view_box.has_value()) {
// FIXME: This should allow just one of width or height to be specified.
// E.g. We should be able to layout <svg width="100%"> where height is unspecified/auto.

2
Userland/Libraries/LibWeb/Layout/SVGGeometryBox.cpp
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@ -33,7 +33,7 @@ Optional<Gfx::AffineTransform> SVGGeometryBox::layout_transform() const
double scaling = 1;
auto origin = viewbox_origin().to_type<double>().to_type<float>();
Gfx::FloatPoint paint_offset = {};
if (svg_box && svg_box->view_box().has_value()) {
if (svg_box && geometry_element.view_box().has_value()) {
// Note: SVGFormattingContext has already done the scaling based on the viewbox,
// we now have to derive what it was from the original bounding box size.
// FIXME: It would be nice if we could store the transform from layout somewhere, so we don't have to solve for it here.

2
Userland/Libraries/LibWeb/Painting/SVGGeometryPaintable.cpp
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@ -76,7 +76,7 @@ void SVGGeometryPaintable::paint(PaintContext& context, PaintPhase phase) const
auto offset = context.floored_device_point(svg_element_rect.location()).to_type<int>().to_type<float>();
painter.translate(offset);
auto maybe_view_box = svg_element->view_box();
auto maybe_view_box = geometry_element.view_box();
auto transform = layout_box().layout_transform();
if (!transform.has_value())

16
Userland/Libraries/LibWeb/SVG/SVGGraphicsElement.cpp
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@ -16,6 +16,7 @@
#include <LibWeb/SVG/SVGGradientElement.h>
#include <LibWeb/SVG/SVGGraphicsElement.h>
#include <LibWeb/SVG/SVGSVGElement.h>
#include <LibWeb/SVG/SVGSymbolElement.h>
namespace Web::SVG {
@ -230,4 +231,19 @@ Optional<float> SVGGraphicsElement::stroke_width() const
return width.to_px(*layout_node(), scaled_viewport_size).to_double();
}
Optional<ViewBox> SVGGraphicsElement::view_box() const
{
if (auto* svg_svg_element = shadow_including_first_ancestor_of_type<SVGSVGElement>()) {
if (svg_svg_element->view_box().has_value())
return svg_svg_element->view_box();
}
if (auto* svg_symbol_element = shadow_including_first_ancestor_of_type<SVGSymbolElement>()) {
if (svg_symbol_element->view_box().has_value())
return svg_symbol_element->view_box();
}
return {};
}
}

3
Userland/Libraries/LibWeb/SVG/SVGGraphicsElement.h
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@ -15,6 +15,7 @@
#include <LibWeb/SVG/SVGElement.h>
#include <LibWeb/SVG/SVGGradientElement.h>
#include <LibWeb/SVG/TagNames.h>
#include <LibWeb/SVG/ViewBox.h>
namespace Web::SVG {
@ -45,6 +46,8 @@ public:
Optional<Gfx::PaintStyle const&> fill_paint_style(SVGPaintContext const&) const;
Optional<Gfx::PaintStyle const&> stroke_paint_style(SVGPaintContext const&) const;
Optional<ViewBox> view_box() const;
protected:
SVGGraphicsElement(DOM::Document&, DOM::QualifiedName);

7
Userland/Libraries/LibWeb/SVG/SVGSymbolElement.cpp
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@ -10,6 +10,7 @@
#include <LibWeb/CSS/StyleValues/IdentifierStyleValue.h>
#include <LibWeb/CSS/StyleValues/OverflowStyleValue.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/SVG/AttributeNames.h>
#include <LibWeb/SVG/SVGSymbolElement.h>
#include <LibWeb/SVG/SVGUseElement.h>
@ -44,8 +45,12 @@ void SVGSymbolElement::apply_presentational_hints(CSS::StyleProperties& style) c
// and this declaration must have importance over any other CSS rule or presentation attribute.
style.set_property(CSS::PropertyID::Display, CSS::DisplayStyleValue::create(CSS::Display::from_short(CSS::Display::Short::None)).release_value_but_fixme_should_propagate_errors());
}
}
// TODO: Parse viewBox and apply it in SVGGraphicsElement/SVGGraphicsPaintable
void SVGSymbolElement::attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value)
{
if (name.equals_ignoring_ascii_case(SVG::AttributeNames::viewBox))
m_view_box = try_parse_view_box(value);
}
bool SVGSymbolElement::is_direct_child_of_use_shadow_tree() const

6
Userland/Libraries/LibWeb/SVG/SVGSymbolElement.h
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@ -18,12 +18,18 @@ public:
void apply_presentational_hints(CSS::StyleProperties& style) const override;
Optional<ViewBox> view_box() const { return m_view_box; }
private:
SVGSymbolElement(DOM::Document&, DOM::QualifiedName);
virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
bool is_direct_child_of_use_shadow_tree() const;
virtual void attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value) override;
Optional<ViewBox> m_view_box;
};
}