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LibWeb: Add an initial implementation of SVG <radialGradient>
This follows on from the SVG linear gradients. It supports the same features (xlink:href, gradientUnits, gradientTransform). With this commit I have now implemented all web gradients :^) (Though we are still missing a few parameters for SVG gradients, e.g. spreadMethod).
This commit is contained in:
MacDue
Andreas Kling
parent
2826bd2b45
commit
9b652842e4
6 changed files with 289 additions and 0 deletions
211
Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp
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Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp
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/*
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/SVGRadialGradientElement.h>
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namespace Web::SVG {
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SVGRadialGradientElement::SVGRadialGradientElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: SVGGradientElement(document, qualified_name)
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{
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}
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JS::ThrowCompletionOr<void> SVGRadialGradientElement::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Base::initialize(realm));
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set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGRadialGradientElementPrototype>(realm, "SVGRadialGradientElement"));
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return {};
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}
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void SVGRadialGradientElement::parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value)
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{
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SVGGradientElement::parse_attribute(name, value);
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// FIXME: These are <length> or <coordinate> in the spec, but all examples seem to allow percentages
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// and unitless values.
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if (name == SVG::AttributeNames::cx) {
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m_cx = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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} else if (name == SVG::AttributeNames::cy) {
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m_cy = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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} else if (name == SVG::AttributeNames::fx) {
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m_fx = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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} else if (name == SVG::AttributeNames::fy) {
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m_fy = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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} else if (name == SVG::AttributeNames::fr) {
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m_fr = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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} else if (name == SVG::AttributeNames::r) {
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m_r = AttributeParser::parse_number_percentage(value);
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m_paint_style = nullptr;
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}
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementFXAttribute
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NumberPercentage SVGRadialGradientElement::start_circle_x() const
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{
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if (m_fx.has_value())
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return *m_fx;
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// If the element references an element that specifies a value for 'fx', then the value of 'fx' is
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// inherited from the referenced element.
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if (auto href = radial_gradient_xlink_href())
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return href->start_circle_x();
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// If attribute ‘fx’ is not specified, ‘fx’ will coincide with the presentational value of ‘cx’ for
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// the element whether the value for 'cx' was inherited or not.
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return end_circle_x();
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementFYAttribute
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NumberPercentage SVGRadialGradientElement::start_circle_y() const
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{
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if (m_fy.has_value())
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return *m_fy;
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// If the element references an element that specifies a value for 'fy', then the value of 'fy' is
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// inherited from the referenced element.
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if (auto href = radial_gradient_xlink_href())
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return href->start_circle_y();
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// If attribute ‘fy’ is not specified, ‘fy’ will coincide with the presentational value of ‘cy’ for
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// the element whether the value for 'cy' was inherited or not.
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return end_circle_y();
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementFRAttribute
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NumberPercentage SVGRadialGradientElement::start_circle_radius() const
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{
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// Note: A negative value is an error.
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if (m_fr.has_value() && m_fr->value() >= 0)
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return *m_fr;
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// if the element references an element that specifies a value for 'fr', then the value of
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// 'fr' is inherited from the referenced element.
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if (auto href = radial_gradient_xlink_href())
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return href->start_circle_radius();
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// If the attribute is not specified, the effect is as if a value of '0%' were specified.
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return NumberPercentage::create_percentage(0);
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementCXAttribute
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NumberPercentage SVGRadialGradientElement::end_circle_x() const
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{
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if (m_cx.has_value())
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return *m_cx;
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if (auto href = radial_gradient_xlink_href())
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return href->end_circle_x();
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return NumberPercentage::create_percentage(50);
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementCYAttribute
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NumberPercentage SVGRadialGradientElement::end_circle_y() const
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{
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if (m_cy.has_value())
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return *m_cy;
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if (auto href = radial_gradient_xlink_href())
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return href->end_circle_y();
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return NumberPercentage::create_percentage(50);
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}
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// https://svgwg.org/svg2-draft/pservers.html#RadialGradientElementRAttribute
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NumberPercentage SVGRadialGradientElement::end_circle_radius() const
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{
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// Note: A negative value is an error.
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if (m_r.has_value() && m_r->value() >= 0)
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return *m_r;
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if (auto href = radial_gradient_xlink_href())
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return href->end_circle_radius();
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return NumberPercentage::create_percentage(50);
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}
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Optional<Gfx::PaintStyle const&> SVGRadialGradientElement::to_gfx_paint_style(SVGPaintContext const& paint_context) const
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{
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auto units = gradient_units();
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Gfx::FloatPoint start_center;
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float start_radius = 0.0f;
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Gfx::FloatPoint end_center;
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float end_radius = 0.0f;
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if (units == GradientUnits::ObjectBoundingBox) {
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// If gradientUnits="objectBoundingBox", the user coordinate system for attributes ‘cx’, ‘cy’, ‘r’, ‘fx’, ‘fy’, and ‘fr’
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// is established using the bounding box of the element to which the gradient is applied (see Object bounding box units)
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// and then applying the transform specified by attribute ‘gradientTransform’. Percentages represent values relative
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// to the bounding box for the object.
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start_center = Gfx::FloatPoint {
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start_circle_x().value(), start_circle_y().value()
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};
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start_radius = start_circle_radius().value();
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end_center = paint_context.path_bounding_box.location() + Gfx::FloatPoint { end_circle_x().value(), end_circle_y().value() };
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end_radius = end_circle_radius().value();
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} else {
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// GradientUnits::UserSpaceOnUse
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// If gradientUnits="userSpaceOnUse", ‘cx’, ‘cy’, ‘r’, ‘fx’, ‘fy’, and ‘fr’ represent values in the coordinate system
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// that results from taking the current user coordinate system in place at the time when the gradient element is
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// referenced (i.e., the user coordinate system for the element referencing the gradient element via a fill or stroke property)
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// and then applying the transform specified by attribute ‘gradientTransform’.
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// Percentages represent values relative to the current SVG viewport.
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// Note: The start/end centers will be in relative units here.
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// They will be resolved at paint time using the gradient paint transform.
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start_center = Gfx::FloatPoint {
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start_circle_x().resolve_relative_to(paint_context.viewport.width()),
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start_circle_y().resolve_relative_to(paint_context.viewport.height()),
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};
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// FIXME: Where in the spec does it say what axis the radius is relative to?
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start_radius = start_circle_radius().resolve_relative_to(paint_context.viewport.width());
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end_center = Gfx::FloatPoint {
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end_circle_x().resolve_relative_to(paint_context.viewport.width()),
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end_circle_y().resolve_relative_to(paint_context.viewport.height()),
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};
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end_radius = end_circle_radius().resolve_relative_to(paint_context.viewport.width());
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}
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if (!m_paint_style) {
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m_paint_style = Gfx::SVGRadialGradientPaintStyle::create(start_center, start_radius, end_center, end_radius)
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.release_value_but_fixme_should_propagate_errors();
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// FIXME: Update stops in DOM changes:
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add_color_stops(*m_paint_style);
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} else {
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m_paint_style->set_start_center(start_center);
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m_paint_style->set_start_radius(start_radius);
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m_paint_style->set_end_center(end_center);
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m_paint_style->set_end_radius(end_radius);
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}
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m_paint_style->set_gradient_transform(gradient_paint_transform(paint_context));
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return *m_paint_style;
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::cx() const
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{
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TODO();
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::cy() const
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{
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TODO();
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::fx() const
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{
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TODO();
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::fy() const
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{
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TODO();
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::fr() const
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{
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TODO();
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}
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JS::NonnullGCPtr<SVGAnimatedLength> SVGRadialGradientElement::r() const
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{
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TODO();
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}
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}
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