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https://github.com/RGBCube/serenity
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a37c29e353
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. :^)
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
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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 <AK/ByteBuffer.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/DOM/HTMLElement.h>
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namespace Web {
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class LayoutDocument;
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class HTMLCanvasElement : public HTMLElement {
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public:
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using WrapperType = Bindings::HTMLCanvasElementWrapper;
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HTMLCanvasElement(Document&, const String& tag_name);
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virtual ~HTMLCanvasElement() override;
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int preferred_width() const;
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int preferred_height() const;
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const Gfx::Bitmap* bitmap() const { return m_bitmap; }
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Gfx::Bitmap& ensure_bitmap();
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CanvasRenderingContext2D* get_context(String type);
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private:
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virtual RefPtr<LayoutNode> create_layout_node(const StyleProperties* parent_style) const override;
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RefPtr<Gfx::Bitmap> m_bitmap;
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RefPtr<CanvasRenderingContext2D> m_context;
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};
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template<>
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inline bool is<HTMLCanvasElement>(const Node& node)
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{
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return is<Element>(node) && to<Element>(node).tag_name().to_lowercase() == "canvas";
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}
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}
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