mirror of
https://github.com/RGBCube/serenity
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22f0953fe2
This commit starts adding a basic SVG element. Currently, svg elements have support for the width and height properties, as well as the stroke, stroke-width, and fill properties. The only child element supported is the path element, as most other graphical elements are just shorthand for paths.
123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
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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 <LibGfx/Bitmap.h>
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#include <LibWeb/DOM/HTMLElement.h>
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#include <LibWeb/DOM/SvgContext.h>
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namespace Web {
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enum class PathInstructionType {
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Move,
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ClosePath,
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Line,
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HorizontalLine,
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VerticalLine,
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Curve,
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SmoothCurve,
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QuadraticBezierCurve,
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SmoothQuadraticBezierCurve,
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EllipticalArc,
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Invalid,
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};
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struct PathInstruction {
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PathInstructionType type;
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bool absolute;
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Vector<float> data;
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};
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class PathDataParser final {
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public:
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PathDataParser(const String& source);
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~PathDataParser() = default;
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Vector<PathInstruction> parse();
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private:
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void parse_drawto();
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void parse_moveto();
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void parse_closepath();
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void parse_lineto();
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void parse_horizontal_lineto();
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void parse_vertical_lineto();
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void parse_curveto();
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void parse_smooth_curveto();
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void parse_quadratic_bezier_curveto();
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void parse_smooth_quadratic_bezier_curveto();
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void parse_elliptical_arc();
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float parse_coordinate();
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Vector<float> parse_coordinate_pair();
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Vector<float> parse_coordinate_sequence();
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Vector<Vector<float>> parse_coordinate_pair_sequence();
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Vector<float> parse_coordinate_pair_double();
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Vector<float> parse_coordinate_pair_triplet();
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Vector<float> parse_elliptical_arg_argument();
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void parse_whitespace(bool must_match_once = false);
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void parse_comma_whitespace();
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float parse_fractional_constant();
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float parse_number();
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float parse_flag();
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bool match_whitespace() const;
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bool match_comma_whitespace() const;
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bool match_number() const;
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bool match(char c) const { return !done() && ch() == c; }
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bool done() const { return m_cursor >= m_source.length(); }
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char ch() const { return m_source[m_cursor]; }
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char consume() { return m_source[m_cursor++]; }
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String m_source;
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size_t m_cursor { 0 };
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Vector<PathInstruction> m_instructions;
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};
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class HTMLPathElement final
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: public HTMLElement
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, public SvgGraphicElement {
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public:
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HTMLPathElement(Document&, const FlyString& tag_name);
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virtual ~HTMLPathElement() override = default;
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virtual void parse_attribute(const FlyString& name, const String& value) override;
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virtual void paint(const SvgPaintingContext&, Gfx::Painter& painter) override;
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private:
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Vector<PathInstruction> m_instructions;
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};
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template<>
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inline bool is<HTMLPathElement>(const Node& node)
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{
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return is<Element>(node) && to<Element>(node).tag_name() == HTML::TagNames::path;
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}
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}
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