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LibWeb: Add CanvasRenderingContext2D context attribute parsing

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Makes `context.getContextAttributes()` work.
This commit is contained in:
Jelle Raaijmakers 2025-04-28 16:01:47 +02:00
commit fac0f82031
Notes: github-actions[bot] 2025-04-29 11:52:34 +00:00
6 changed files with 81 additions and 17 deletions
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22
Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -1,6 +1,7 @@
/*
* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -8,9 +9,6 @@
#pragma once
#include <AK/String.h>
#include <AK/Variant.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/Color.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
@ -31,11 +29,18 @@
#include <LibWeb/HTML/Canvas/CanvasText.h>
#include <LibWeb/HTML/Canvas/CanvasTextDrawingStyles.h>
#include <LibWeb/HTML/Canvas/CanvasTransform.h>
#include <LibWeb/HTML/CanvasGradient.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::HTML {
struct CanvasRenderingContext2DSettings {
bool alpha { true };
bool desynchronized { false };
Bindings::PredefinedColorSpace color_space { Bindings::PredefinedColorSpace::Srgb };
Bindings::CanvasColorType color_type { Bindings::CanvasColorType::Unorm8 };
bool will_read_frequently { false };
};
class CanvasRenderingContext2D
: public Bindings::PlatformObject
, public CanvasPath
@ -58,7 +63,7 @@ class CanvasRenderingContext2D
GC_DECLARE_ALLOCATOR(CanvasRenderingContext2D);
public:
[[nodiscard]] static GC::Ref<CanvasRenderingContext2D> create(JS::Realm&, HTMLCanvasElement&);
static JS::ThrowCompletionOr<GC::Ref<CanvasRenderingContext2D>> create(JS::Realm&, HTMLCanvasElement&, JS::Value options);
virtual ~CanvasRenderingContext2D() override;
virtual void fill_rect(float x, float y, float width, float height) override;
@ -86,6 +91,8 @@ public:
GC::Ref<HTMLCanvasElement> canvas_for_binding() const;
CanvasRenderingContext2DSettings get_context_attributes() const { return m_context_attributes; }
virtual GC::Ref<TextMetrics> measure_text(StringView text) override;
virtual void clip(StringView fill_rule) override;
@ -128,11 +135,13 @@ public:
void allocate_painting_surface_if_needed();
private:
explicit CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&);
CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&, CanvasRenderingContext2DSettings);
virtual void initialize(JS::Realm&) override;
virtual void visit_edges(Cell::Visitor&) override;
static JS::ThrowCompletionOr<CanvasRenderingContext2DSettings> context_attributes_from_options(JS::VM&, JS::Value);
virtual Gfx::Painter* painter_for_canvas_state() override { return painter(); }
virtual Gfx::Path& path_for_canvas_state() override { return path(); }
@ -165,6 +174,7 @@ private:
Gfx::IntSize m_size;
RefPtr<Gfx::PaintingSurface> m_surface;
CanvasRenderingContext2DSettings m_context_attributes;
};
enum class CanvasImageSourceUsability {