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/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/QuickSort.h>
#include <LibWeb/DOM/ExceptionOr.h>
#include <LibWeb/HTML/CanvasGradient.h>
namespace Web::HTML {
NonnullRefPtr<CanvasGradient> CanvasGradient::create_radial(double x0, double y0, double r0, double x1, double y1, double r1)
{
(void)x0;
(void)y0;
(void)r0;
(void)x1;
(void)y1;
(void)r1;
return adopt_ref(*new CanvasGradient(Type::Radial));
}
NonnullRefPtr<CanvasGradient> CanvasGradient::create_linear(double x0, double y0, double x1, double y1)
{
(void)x0;
(void)y0;
(void)x1;
(void)y1;
return adopt_ref(*new CanvasGradient(Type::Linear));
}
NonnullRefPtr<CanvasGradient> CanvasGradient::create_conic(double start_angle, double x, double y)
{
(void)start_angle;
(void)x;
(void)y;
return adopt_ref(*new CanvasGradient(Type::Conic));
}
CanvasGradient::CanvasGradient(Type type)
: m_type(type)
{
}
CanvasGradient::~CanvasGradient() = default;
// https://html.spec.whatwg.org/multipage/canvas.html#dom-canvasgradient-addcolorstop
DOM::ExceptionOr<void> CanvasGradient::add_color_stop(double offset, String const& color)
{
// 1. If the offset is less than 0 or greater than 1, then throw an "IndexSizeError" DOMException.
if (offset < 0 || offset > 1)
return DOM::IndexSizeError::create("CanvasGradient color stop offset out of bounds");
// 2. Let parsed color be the result of parsing color.
auto parsed_color = Color::from_string(color);
// 3. If parsed color is failure, throw a "SyntaxError" DOMException.
if (!parsed_color.has_value())
return DOM::SyntaxError::create("Could not parse color for CanvasGradient");
// 4. Place a new stop on the gradient, at offset offset relative to the whole gradient, and with the color parsed color.
m_color_stops.append(ColorStop { offset, parsed_color.value() });
// FIXME: If multiple stops are added at the same offset on a gradient, then they must be placed in the order added,
// with the first one closest to the start of the gradient, and each subsequent one infinitesimally further along
// towards the end point (in effect causing all but the first and last stop added at each point to be ignored).
quick_sort(m_color_stops, [](auto& a, auto& b) { return a.offset < b.offset; });
return {};
}
}
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