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LibWeb: Update CRC2D .fillStyle and .strokeStyle to accept gradients

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While doing add some structures to hold these new fill styles and
plumb them over to the painter.
This commit is contained in:
MacDue 2023-01-18 20:10:00 +01:00 • committed by Andreas Kling
parent 2be4142138
commit 24cb57ac88
5 changed files with 89 additions and 17 deletions
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29
Userland/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h
View file

@ -2,6 +2,7 @@
* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -19,27 +20,39 @@ template<typename IncludingClass>
class CanvasFillStrokeStyles {
public:
~CanvasFillStrokeStyles() = default;
using FillOrStrokeStyleVariant = Variant<DeprecatedString, JS::Handle<CanvasGradient>>;
void set_fill_style(DeprecatedString style)
static CanvasState::FillOrStrokeStyle to_canvas_state_fill_or_stoke_style(auto const& style)
{
return style.visit(
[&](DeprecatedString const& string) -> CanvasState::FillOrStrokeStyle {
return Gfx::Color::from_string(string).value_or(Color::Black);
},
[&](JS::Handle<CanvasGradient> gradient) -> CanvasState::FillOrStrokeStyle {
return gradient;
});
}
void set_fill_style(FillOrStrokeStyleVariant style)
{
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
my_drawing_state().fill_style = Gfx::Color::from_string(style).value_or(Color::Black);
my_drawing_state().fill_style = to_canvas_state_fill_or_stoke_style(style);
}
DeprecatedString fill_style() const
FillOrStrokeStyleVariant fill_style() const
{
return my_drawing_state().fill_style.to_deprecated_string();
return my_drawing_state().fill_style.to_js_fill_or_stoke_style();
}
void set_stroke_style(DeprecatedString style)
void set_stroke_style(FillOrStrokeStyleVariant style)
{
// FIXME: 2. If the given value is a CanvasPattern object that is marked as not origin-clean, then set this's origin-clean flag to false.
my_drawing_state().stroke_style = Gfx::Color::from_string(style).value_or(Color::Black);
my_drawing_state().stroke_style = to_canvas_state_fill_or_stoke_style(style);
}
DeprecatedString stroke_style() const
FillOrStrokeStyleVariant stroke_style() const
{
return my_drawing_state().stroke_style.to_deprecated_string();
return my_drawing_state().stroke_style.to_js_fill_or_stoke_style();
}
JS::NonnullGCPtr<CanvasGradient> create_radial_gradient(double x0, double y0, double r0, double x1, double y1, double r1)

4
Userland/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.idl
View file

@ -3,9 +3,9 @@
// https://html.spec.whatwg.org/multipage/canvas.html#canvasfillstrokestyles
interface mixin CanvasFillStrokeStyles {
// FIXME: Should be `(DOMString or CanvasGradient or CanvasPattern)`
attribute DOMString strokeStyle;
attribute (DOMString or CanvasGradient) strokeStyle;
// FIXME: Should be `(DOMString or CanvasGradient or CanvasPattern)`
attribute DOMString fillStyle;
attribute (DOMString or CanvasGradient) fillStyle;
CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
CanvasGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1);
CanvasGradient createConicGradient(double startAngle, double x, double y);

18
Userland/Libraries/LibWeb/HTML/Canvas/CanvasState.cpp
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@ -1,6 +1,7 @@
/*
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -39,4 +40,21 @@ bool CanvasState::is_context_lost()
return m_context_lost;
}
NonnullRefPtr<Gfx::PaintStyle> CanvasState::FillOrStrokeStyle::to_gfx_paint_style()
{
VERIFY_NOT_REACHED();
}
Gfx::Color CanvasState::FillOrStrokeStyle::to_color_but_fixme_should_accept_any_paint_style() const
{
return as_color().value_or(Gfx::Color::Black);
}
Optional<Gfx::Color> CanvasState::FillOrStrokeStyle::as_color() const
{
if (auto* color = m_fill_or_stoke_style.get_pointer<Gfx::Color>())
return *color;
return {};
}
}

38
Userland/Libraries/LibWeb/HTML/Canvas/CanvasState.h
View file

@ -1,14 +1,18 @@
/*
* 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/HTML/CanvasGradient.h>
namespace Web::HTML {
@ -22,11 +26,41 @@ public:
void reset();
bool is_context_lost();
using FillOrStrokeVariant = Variant<Gfx::Color, JS::Handle<CanvasGradient>>;
struct FillOrStrokeStyle {
FillOrStrokeStyle(Gfx::Color color)
: m_fill_or_stoke_style(color)
{
}
FillOrStrokeStyle(JS::Handle<CanvasGradient> gradient)
: m_fill_or_stoke_style(gradient)
{
}
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;
Variant<DeprecatedString, JS::Handle<CanvasGradient>> to_js_fill_or_stoke_style() const
{
if (auto* handle = m_fill_or_stoke_style.get_pointer<JS::Handle<CanvasGradient>>())
return *handle;
return m_fill_or_stoke_style.get<Gfx::Color>().to_deprecated_string();
}
private:
FillOrStrokeVariant m_fill_or_stoke_style;
RefPtr<Gfx::PaintStyle> m_color_fill_style { nullptr };
};
// https://html.spec.whatwg.org/multipage/canvas.html#drawing-state
struct DrawingState {
Gfx::AffineTransform transform;
Gfx::Color fill_style { Gfx::Color::Black };
Gfx::Color stroke_style { Gfx::Color::Black };
FillOrStrokeStyle fill_style { Gfx::Color::Black };
FillOrStrokeStyle stroke_style { Gfx::Color::Black };
float line_width { 1 };
};
DrawingState& drawing_state() { return m_drawing_state; }