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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/SVG/AttributeParser.h>
#include <LibWeb/SVG/SVGGradientElement.h>
#include <LibWeb/SVG/SVGGraphicsElement.h>
#include <LibWeb/SVG/SVGSVGElement.h>
namespace Web::SVG {
SVGGraphicsElement::SVGGraphicsElement(DOM::Document& document, DOM::QualifiedName qualified_name)
: SVGElement(document, move(qualified_name))
{
}
JS::ThrowCompletionOr<void> SVGGraphicsElement::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGGraphicsElementPrototype>(realm, "SVGGraphicsElement"));
return {};
}
void SVGGraphicsElement::parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value)
{
SVGElement::parse_attribute(name, value);
if (name == "transform"sv) {
auto transform_list = AttributeParser::parse_transform(value);
if (transform_list.has_value())
m_transform = transform_from_transform_list(*transform_list);
}
}
Optional<Gfx::PaintStyle const&> SVGGraphicsElement::fill_paint_style(SVGPaintContext const& paint_context) const
{
// FIXME: This entire function is an ad-hoc hack:
if (!layout_node())
return {};
auto& fill = layout_node()->computed_values().fill();
if (!fill.has_value() || !fill->is_url())
return {};
auto& url = fill->as_url();
auto gradient = document().get_element_by_id(url.fragment());
if (!gradient)
return {};
if (is<SVG::SVGGradientElement>(*gradient))
return static_cast<SVG::SVGGradientElement const&>(*gradient).to_gfx_paint_style(paint_context);
return {};
}
Gfx::AffineTransform transform_from_transform_list(ReadonlySpan<Transform> transform_list)
{
Gfx::AffineTransform affine_transform;
auto to_radians = [](float degrees) {
return degrees * (AK::Pi<float> / 180.0f);
};
for (auto& transform : transform_list) {
transform.operation.visit(
[&](Transform::Translate const& translate) {
affine_transform.multiply(Gfx::AffineTransform {}.translate({ translate.x, translate.y }));
},
[&](Transform::Scale const& scale) {
affine_transform.multiply(Gfx::AffineTransform {}.scale({ scale.x, scale.y }));
},
[&](Transform::Rotate const& rotate) {
Gfx::AffineTransform translate_transform;
affine_transform.multiply(
Gfx::AffineTransform {}
.translate({ rotate.x, rotate.y })
.rotate_radians(to_radians(rotate.a))
.translate({ -rotate.x, -rotate.y }));
},
[&](Transform::SkewX const& skew_x) {
affine_transform.multiply(Gfx::AffineTransform {}.skew_radians(to_radians(skew_x.a), 0));
},
[&](Transform::SkewY const& skew_y) {
affine_transform.multiply(Gfx::AffineTransform {}.skew_radians(0, to_radians(skew_y.a)));
},
[&](Transform::Matrix const& matrix) {
affine_transform.multiply(Gfx::AffineTransform {
matrix.a, matrix.b, matrix.c, matrix.d, matrix.e, matrix.f });
});
}
return affine_transform;
}
Gfx::AffineTransform SVGGraphicsElement::get_transform() const
{
// FIXME: It would be nice to do this using the SVGContext, however, then layout/hit testing knows nothing about the transform.
Gfx::AffineTransform transform = m_transform;
for (auto* svg_ancestor = first_ancestor_of_type<SVGGraphicsElement>(); svg_ancestor; svg_ancestor = svg_ancestor->first_ancestor_of_type<SVGGraphicsElement>()) {
transform = Gfx::AffineTransform { svg_ancestor->m_transform }.multiply(transform);
}
return transform;
}
void SVGGraphicsElement::apply_presentational_hints(CSS::StyleProperties& style) const
{
CSS::Parser::ParsingContext parsing_context { document() };
for_each_attribute([&](auto& name, auto& value) {
if (name.equals_ignoring_ascii_case("fill"sv)) {
// FIXME: The `fill` attribute and CSS `fill` property are not the same! But our support is limited enough that they are equivalent for now.
if (auto fill_value = parse_css_value(parsing_context, value, CSS::PropertyID::Fill).release_value_but_fixme_should_propagate_errors())
style.set_property(CSS::PropertyID::Fill, fill_value.release_nonnull());
} else if (name.equals_ignoring_ascii_case("stroke"sv)) {
// FIXME: The `stroke` attribute and CSS `stroke` property are not the same! But our support is limited enough that they are equivalent for now.
if (auto stroke_value = parse_css_value(parsing_context, value, CSS::PropertyID::Stroke).release_value_but_fixme_should_propagate_errors())
style.set_property(CSS::PropertyID::Stroke, stroke_value.release_nonnull());
} else if (name.equals_ignoring_ascii_case("stroke-width"sv)) {
if (auto stroke_width_value = parse_css_value(parsing_context, value, CSS::PropertyID::StrokeWidth).release_value_but_fixme_should_propagate_errors())
style.set_property(CSS::PropertyID::StrokeWidth, stroke_width_value.release_nonnull());
} else if (name.equals_ignoring_ascii_case("fill-opacity"sv)) {
if (auto fill_opacity_value = parse_css_value(parsing_context, value, CSS::PropertyID::FillOpacity).release_value_but_fixme_should_propagate_errors())
style.set_property(CSS::PropertyID::FillOpacity, fill_opacity_value.release_nonnull());
} else if (name.equals_ignoring_ascii_case("stroke-opacity"sv)) {
if (auto stroke_opacity_value = parse_css_value(parsing_context, value, CSS::PropertyID::FillOpacity).release_value_but_fixme_should_propagate_errors())
style.set_property(CSS::PropertyID::StrokeOpacity, stroke_opacity_value.release_nonnull());
}
});
}
Optional<Gfx::Color> SVGGraphicsElement::fill_color() const
{
if (!layout_node())
return {};
// FIXME: In the working-draft spec, `fill` is intended to be a shorthand, with `fill-color`
// being what we actually want to use. But that's not final or widely supported yet.
return layout_node()->computed_values().fill().map([&](auto& paint) -> Gfx::Color {
if (!paint.is_color())
return Color::Black;
return paint.as_color();
});
}
Optional<Gfx::Color> SVGGraphicsElement::stroke_color() const
{
if (!layout_node())
return {};
// FIXME: In the working-draft spec, `stroke` is intended to be a shorthand, with `stroke-color`
// being what we actually want to use. But that's not final or widely supported yet.
return layout_node()->computed_values().stroke().map([](auto& paint) -> Gfx::Color {
if (!paint.is_color())
return Color::Black;
return paint.as_color();
});
}
Optional<float> SVGGraphicsElement::fill_opacity() const
{
if (!layout_node())
return {};
return layout_node()->computed_values().fill_opacity();
}
Optional<float> SVGGraphicsElement::stroke_opacity() const
{
if (!layout_node())
return {};
return layout_node()->computed_values().stroke_opacity();
}
Optional<float> SVGGraphicsElement::stroke_width() const
{
if (!layout_node())
return {};
// FIXME: Converting to pixels isn't really correct - values should be in "user units"
// https://svgwg.org/svg2-draft/coords.html#TermUserUnits
if (auto width = layout_node()->computed_values().stroke_width(); width.has_value()) {
// Resolved relative to the "Scaled viewport size": https://www.w3.org/TR/2017/WD-fill-stroke-3-20170413/#scaled-viewport-size
// FIXME: This isn't right, but it's something.
CSSPixels viewport_width = 0;
CSSPixels viewport_height = 0;
if (auto* svg_svg_element = first_ancestor_of_type<SVGSVGElement>()) {
if (auto* svg_svg_layout_node = svg_svg_element->layout_node()) {
viewport_width = svg_svg_layout_node->computed_values().width().to_px(*svg_svg_layout_node, 0);
viewport_height = svg_svg_layout_node->computed_values().height().to_px(*svg_svg_layout_node, 0);
}
}
auto scaled_viewport_size = (viewport_width + viewport_height) * 0.5f;
return width->to_px(*layout_node(), scaled_viewport_size).value();
}
return {};
}
}
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