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https://github.com/LadybirdBrowser/ladybird.git
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268b9c5d90
This removes a set of complex reference cycles between DOM, layout tree and browsing context. It also makes lifetimes much easier to reason about, as the DOM and layout trees are now free to keep each other alive.
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/HTML/HTMLElement.h>
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#include <LibWeb/WebGL/WebGLRenderingContext.h>
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namespace Web::HTML {
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class HTMLCanvasElement final : public HTMLElement {
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WEB_PLATFORM_OBJECT(HTMLCanvasElement, HTMLElement);
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public:
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using RenderingContext = Variant<JS::Handle<CanvasRenderingContext2D>, JS::Handle<WebGL::WebGLRenderingContext>, Empty>;
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virtual ~HTMLCanvasElement() override;
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Gfx::Bitmap const* bitmap() const { return m_bitmap; }
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Gfx::Bitmap* bitmap() { return m_bitmap; }
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bool create_bitmap(size_t minimum_width = 0, size_t minimum_height = 0);
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JS::ThrowCompletionOr<RenderingContext> get_context(String const& type, JS::Value options);
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unsigned width() const;
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unsigned height() const;
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void set_width(unsigned);
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void set_height(unsigned);
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String to_data_url(String const& type, Optional<double> quality) const;
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void present();
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private:
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HTMLCanvasElement(DOM::Document&, DOM::QualifiedName);
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virtual void visit_edges(Cell::Visitor&) override;
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virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
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enum class HasOrCreatedContext {
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No,
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Yes,
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};
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HasOrCreatedContext create_2d_context();
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JS::ThrowCompletionOr<HasOrCreatedContext> create_webgl_context(JS::Value options);
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void reset_context_to_default_state();
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RefPtr<Gfx::Bitmap> m_bitmap;
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Variant<JS::NonnullGCPtr<HTML::CanvasRenderingContext2D>, JS::NonnullGCPtr<WebGL::WebGLRenderingContext>, Empty> m_context;
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};
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}
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