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LibWeb: Implement SVGLinearGradientElement (<linearGradient>)

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This represents the SVG <linearGradient>. The actual gradient is
converted to a Gfx::PaintStyle for use in SVG fills... There is a little
guesswork in the implementation, but it seems to match Chrome/Firefox.

Note: Still not hooked up to actual painting in this commit.
This commit is contained in:
MacDue 2023-04-22 18:51:00 +01:00 • committed by Andreas Kling
parent 89d3c6d718
commit aa3464466e
6 changed files with 243 additions and 0 deletions
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56
Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h Normal file
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/*
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/SVG/AttributeParser.h>
#include <LibWeb/SVG/SVGAnimatedLength.h>
#include <LibWeb/SVG/SVGGradientElement.h>
namespace Web::SVG {
class SVGLinearGradientElement : public SVGGradientElement {
WEB_PLATFORM_OBJECT(SVGLinearGradientElement, SVGGradientElement);
public:
virtual ~SVGLinearGradientElement() override = default;
virtual void parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value) override;
virtual Optional<Gfx::PaintStyle const&> to_gfx_paint_style(SVGPaintContext const&) const override;
JS::NonnullGCPtr<SVGAnimatedLength> x1() const;
JS::NonnullGCPtr<SVGAnimatedLength> y1() const;
JS::NonnullGCPtr<SVGAnimatedLength> x2() const;
JS::NonnullGCPtr<SVGAnimatedLength> y2() const;
protected:
SVGLinearGradientElement(DOM::Document&, DOM::QualifiedName);
virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
private:
JS::GCPtr<SVGLinearGradientElement const> linear_gradient_xlink_href() const
{
if (auto href = xlink_href(); href && is<SVGLinearGradientElement>(*href))
return &verify_cast<SVGLinearGradientElement>(*href);
return {};
}
NumberPercentage start_x() const;
NumberPercentage start_y() const;
NumberPercentage end_x() const;
NumberPercentage end_y() const;
Optional<NumberPercentage> m_x1;
Optional<NumberPercentage> m_y1;
Optional<NumberPercentage> m_x2;
Optional<NumberPercentage> m_y2;
mutable RefPtr<Gfx::SVGLinearGradientPaintStyle> m_paint_style;
};
}