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/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Variant.h>
#include <AK/Vector.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/Color.h>
#include <LibGfx/PaintStyle.h>
#include <LibWeb/Bindings/CanvasRenderingContext2DPrototype.h>
#include <LibWeb/HTML/Canvas/CanvasPathClipper.h>
#include <LibWeb/HTML/CanvasGradient.h>
#include <LibWeb/HTML/CanvasPattern.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/canvas.html#canvasstate
class CanvasState {
public:
virtual ~CanvasState() = default;
void save();
void restore();
void reset();
bool is_context_lost();
using FillOrStrokeVariant = Variant<Gfx::Color, JS::Handle<CanvasGradient>, JS::Handle<CanvasPattern>>;
struct FillOrStrokeStyle {
FillOrStrokeStyle(Gfx::Color color)
: m_fill_or_stroke_style(color)
{
}
FillOrStrokeStyle(JS::Handle<CanvasGradient> gradient)
: m_fill_or_stroke_style(gradient)
{
}
FillOrStrokeStyle(JS::Handle<CanvasPattern> pattern)
: m_fill_or_stroke_style(pattern)
{
}
NonnullRefPtr<Gfx::PaintStyle> to_gfx_paint_style();
Optional<Gfx::Color> as_color() const;
Gfx::Color to_color_but_fixme_should_accept_any_paint_style() const;
using JsFillOrStrokeStyle = Variant<DeprecatedString, JS::Handle<CanvasGradient>, JS::Handle<CanvasPattern>>;
JsFillOrStrokeStyle to_js_fill_or_stroke_style() const
{
return m_fill_or_stroke_style.visit(
[&](Gfx::Color color) -> JsFillOrStrokeStyle {
return color.to_deprecated_string();
},
[&](auto handle) -> JsFillOrStrokeStyle {
return handle;
});
}
private:
FillOrStrokeVariant m_fill_or_stroke_style;
RefPtr<Gfx::PaintStyle> m_color_paint_style { nullptr };
};
// https://html.spec.whatwg.org/multipage/canvas.html#drawing-state
struct DrawingState {
Gfx::AffineTransform transform;
FillOrStrokeStyle fill_style { Gfx::Color::Black };
FillOrStrokeStyle stroke_style { Gfx::Color::Black };
float line_width { 1 };
bool image_smoothing_enabled { true };
Bindings::ImageSmoothingQuality image_smoothing_quality { Bindings::ImageSmoothingQuality::Low };
Optional<CanvasClip> clip;
};
DrawingState& drawing_state() { return m_drawing_state; }
DrawingState const& drawing_state() const { return m_drawing_state; }
void clear_drawing_state_stack() { m_drawing_state_stack.clear(); }
void reset_drawing_state() { m_drawing_state = {}; }
virtual void reset_to_default_state() = 0;
protected:
CanvasState() = default;
private:
DrawingState m_drawing_state;
Vector<DrawingState> m_drawing_state_stack;
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-context-lost
bool m_context_lost { false };
};
}
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