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LibWeb: Derive SVG root's natural size from width/height attributes

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We were incorrectly looking at the CSS computed values for width and
height to determine the natural size of <svg> root elements.
This meant that elements where the attribute and computed value were
different values would end up with incorrect natural size.
This commit is contained in:
Andreas Kling 2024-08-22 13:32:25 +02:00 • committed by Andreas Kling
commit 8eacfc8f10
Notes: github-actions[bot] 2024-08-22 13:30:19 +00:00
5 changed files with 109 additions and 67 deletions
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55
Userland/Libraries/LibWeb/SVG/SVGSVGElement.cpp
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@ -47,6 +47,38 @@ JS::GCPtr<Layout::Node> SVGSVGElement::create_layout_node(NonnullRefPtr<CSS::Sty
return heap().allocate_without_realm<Layout::SVGSVGBox>(document(), *this, move(style));
}
RefPtr<CSS::CSSStyleValue> SVGSVGElement::width_style_value_from_attribute() const
{
auto parsing_context = CSS::Parser::ParsingContext { document(), CSS::Parser::ParsingContext::Mode::SVGPresentationAttribute };
auto width_attribute = attribute(SVG::AttributeNames::width);
if (auto width_value = parse_css_value(parsing_context, width_attribute.value_or(String {}), CSS::PropertyID::Width)) {
return width_value.release_nonnull();
}
if (width_attribute == "") {
// If the `width` attribute is an empty string, it defaults to 100%.
// This matches WebKit and Blink, but not Firefox. The spec is unclear.
// FIXME: Figure out what to do here.
return CSS::PercentageStyleValue::create(CSS::Percentage { 100 });
}
return nullptr;
}
RefPtr<CSS::CSSStyleValue> SVGSVGElement::height_style_value_from_attribute() const
{
auto parsing_context = CSS::Parser::ParsingContext { document(), CSS::Parser::ParsingContext::Mode::SVGPresentationAttribute };
auto height_attribute = attribute(SVG::AttributeNames::height);
if (auto height_value = parse_css_value(parsing_context, height_attribute.value_or(String {}), CSS::PropertyID::Height)) {
return height_value.release_nonnull();
}
if (height_attribute == "") {
// If the `height` attribute is an empty string, it defaults to 100%.
// This matches WebKit and Blink, but not Firefox. The spec is unclear.
// FIXME: Figure out what to do here.
return CSS::PercentageStyleValue::create(CSS::Percentage { 100 });
}
return nullptr;
}
void SVGSVGElement::apply_presentational_hints(CSS::StyleProperties& style) const
{
Base::apply_presentational_hints(style);
@ -62,26 +94,11 @@ void SVGSVGElement::apply_presentational_hints(CSS::StyleProperties& style) cons
style.set_property(CSS::PropertyID::Y, y_value.release_nonnull());
}
auto width_attribute = attribute(SVG::AttributeNames::width);
if (auto width_value = parse_css_value(parsing_context, width_attribute.value_or(String {}), CSS::PropertyID::Width)) {
style.set_property(CSS::PropertyID::Width, width_value.release_nonnull());
} else if (width_attribute == "") {
// If the `width` attribute is an empty string, it defaults to 100%.
// This matches WebKit and Blink, but not Firefox. The spec is unclear.
// FIXME: Figure out what to do here.
style.set_property(CSS::PropertyID::Width, CSS::PercentageStyleValue::create(CSS::Percentage { 100 }));
}
if (auto width = width_style_value_from_attribute())
style.set_property(CSS::PropertyID::Width, width.release_nonnull());
// Height defaults to 100%
auto height_attribute = attribute(SVG::AttributeNames::height);
if (auto height_value = parse_css_value(parsing_context, height_attribute.value_or(String {}), CSS::PropertyID::Height)) {
style.set_property(CSS::PropertyID::Height, height_value.release_nonnull());
} else if (height_attribute == "") {
// If the `height` attribute is an empty string, it defaults to 100%.
// This matches WebKit and Blink, but not Firefox. The spec is unclear.
// FIXME: Figure out what to do here.
style.set_property(CSS::PropertyID::Height, CSS::PercentageStyleValue::create(CSS::Percentage { 100 }));
}
if (auto height = height_style_value_from_attribute())
style.set_property(CSS::PropertyID::Height, height.release_nonnull());
}
void SVGSVGElement::attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value)