mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 06:48:12 +00:00
2e0297d703
Since SVG gradients can reference each other, we have to keep track of visited gradients when traversing the link chain, or we will recurse infinitely when there's a reference cycle.
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
/*
|
|
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/IterationDecision.h>
|
|
#include <LibGfx/PaintStyle.h>
|
|
#include <LibWeb/SVG/AttributeParser.h>
|
|
#include <LibWeb/SVG/SVGElement.h>
|
|
#include <LibWeb/SVG/SVGStopElement.h>
|
|
|
|
namespace Web::SVG {
|
|
|
|
struct SVGPaintContext {
|
|
Gfx::FloatRect viewport;
|
|
Gfx::FloatRect path_bounding_box;
|
|
Gfx::AffineTransform transform;
|
|
};
|
|
|
|
inline Gfx::SVGGradientPaintStyle::SpreadMethod to_gfx_spread_method(SpreadMethod spread_method)
|
|
{
|
|
switch (spread_method) {
|
|
case SpreadMethod::Pad:
|
|
return Gfx::SVGGradientPaintStyle::SpreadMethod::Pad;
|
|
case SpreadMethod::Reflect:
|
|
return Gfx::SVGGradientPaintStyle::SpreadMethod::Reflect;
|
|
case SpreadMethod::Repeat:
|
|
return Gfx::SVGGradientPaintStyle::SpreadMethod::Repeat;
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
}
|
|
|
|
class SVGGradientElement : public SVGElement {
|
|
WEB_PLATFORM_OBJECT(SVGGradientElement, SVGElement);
|
|
|
|
public:
|
|
virtual ~SVGGradientElement() override = default;
|
|
|
|
virtual void attribute_changed(FlyString const& name, Optional<String> const& value) override;
|
|
|
|
virtual Optional<Gfx::PaintStyle const&> to_gfx_paint_style(SVGPaintContext const&) const = 0;
|
|
|
|
GradientUnits gradient_units() const;
|
|
|
|
SpreadMethod spread_method() const;
|
|
|
|
Optional<Gfx::AffineTransform> gradient_transform() const;
|
|
|
|
protected:
|
|
SVGGradientElement(DOM::Document&, DOM::QualifiedName);
|
|
|
|
virtual void initialize(JS::Realm&) override;
|
|
|
|
JS::GCPtr<SVGGradientElement const> linked_gradient(HashTable<SVGGradientElement const*>& seen_gradients) const;
|
|
|
|
Gfx::AffineTransform gradient_paint_transform(SVGPaintContext const&) const;
|
|
|
|
template<VoidFunction<SVGStopElement> Callback>
|
|
void for_each_color_stop(Callback const& callback) const
|
|
{
|
|
HashTable<SVGGradientElement const*> seen_gradients;
|
|
return for_each_color_stop_impl(callback, seen_gradients);
|
|
}
|
|
|
|
void add_color_stops(Gfx::SVGGradientPaintStyle&) const;
|
|
|
|
private:
|
|
template<VoidFunction<SVGStopElement> Callback>
|
|
void for_each_color_stop_impl(Callback const& callback, HashTable<SVGGradientElement const*>& seen_gradients) const
|
|
{
|
|
bool color_stops_found = false;
|
|
for_each_child_of_type<SVG::SVGStopElement>([&](auto& stop) {
|
|
color_stops_found = true;
|
|
callback(stop);
|
|
});
|
|
if (!color_stops_found) {
|
|
if (auto gradient = linked_gradient(seen_gradients))
|
|
gradient->for_each_color_stop_impl(callback, seen_gradients);
|
|
}
|
|
}
|
|
|
|
GradientUnits gradient_units_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
|
|
SpreadMethod spread_method_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
|
|
Optional<Gfx::AffineTransform> gradient_transform_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
|
|
|
|
Optional<GradientUnits> m_gradient_units = {};
|
|
Optional<SpreadMethod> m_spread_method = {};
|
|
Optional<Gfx::AffineTransform> m_gradient_transform = {};
|
|
};
|
|
|
|
}
|