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LibWeb: Add <canvas> element and start fleshing out CRC2D
This patch adds HTMLCanvasElement along with a LayoutCanvas object. The DOM and layout parts are very similar to <img> elements. The <canvas> element holds a Gfx::Bitmap which is sized according to the "width" and "height" attributes on the element. Calling .getContext("2d") on a <canvas> element gives you a context object that draws into the underlying Gfx::Bitmap of the <canvas>. The context weakly points to the <canvas> which allows it to outlive the canvas element if needed. This is really quite cool. :^)
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Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.h
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Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.h
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/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <LibWeb/Bindings/Wrapper.h>
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namespace Web {
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namespace Bindings {
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class CanvasRenderingContext2DWrapper : public Wrapper {
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public:
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explicit CanvasRenderingContext2DWrapper(CanvasRenderingContext2D&);
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virtual ~CanvasRenderingContext2DWrapper() override;
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CanvasRenderingContext2D& impl() { return m_impl; }
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const CanvasRenderingContext2D& impl() const { return m_impl; }
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private:
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virtual const char* class_name() const override { return "CanvasRenderingContext2DWrapper"; }
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NonnullRefPtr<CanvasRenderingContext2D> m_impl;
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};
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CanvasRenderingContext2DWrapper* wrap(JS::Heap&, CanvasRenderingContext2D&);
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}
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}
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