mirror of
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129 lines
4.6 KiB
C++
129 lines
4.6 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@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/RefCountForwarder.h>
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#include <AK/Variant.h>
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#include <LibGfx/AffineTransform.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/Path.h>
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#include <LibWeb/Bindings/Wrappable.h>
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#include <LibWeb/DOM/ExceptionOr.h>
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#include <LibWeb/HTML/Canvas/CanvasDrawImage.h>
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#include <LibWeb/HTML/Canvas/CanvasDrawPath.h>
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#include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>
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#include <LibWeb/HTML/Canvas/CanvasImageData.h>
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#include <LibWeb/HTML/Canvas/CanvasPath.h>
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#include <LibWeb/HTML/Canvas/CanvasRect.h>
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#include <LibWeb/HTML/Canvas/CanvasState.h>
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#include <LibWeb/HTML/Canvas/CanvasText.h>
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#include <LibWeb/HTML/Canvas/CanvasTransform.h>
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#include <LibWeb/HTML/CanvasGradient.h>
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#include <LibWeb/Layout/InlineNode.h>
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#include <LibWeb/Layout/LineBox.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/canvas.html#canvasimagesource
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// NOTE: This is the Variant created by the IDL wrapper generator, and needs to be updated accordingly.
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using CanvasImageSource = Variant<NonnullRefPtr<HTMLImageElement>, NonnullRefPtr<HTMLCanvasElement>>;
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class CanvasRenderingContext2D
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: public RefCountForwarder<HTMLCanvasElement>
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, public Bindings::Wrappable
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, public CanvasPath
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, public CanvasState
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, public CanvasTransform<CanvasRenderingContext2D>
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, public CanvasFillStrokeStyles<CanvasRenderingContext2D>
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, public CanvasRect
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, public CanvasDrawPath
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, public CanvasText
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, public CanvasDrawImage
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, public CanvasImageData {
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AK_MAKE_NONCOPYABLE(CanvasRenderingContext2D);
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AK_MAKE_NONMOVABLE(CanvasRenderingContext2D);
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public:
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using WrapperType = Bindings::CanvasRenderingContext2DWrapper;
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static NonnullRefPtr<CanvasRenderingContext2D> create(HTMLCanvasElement& element) { return adopt_ref(*new CanvasRenderingContext2D(element)); }
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~CanvasRenderingContext2D();
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virtual void fill_rect(float x, float y, float width, float height) override;
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virtual void stroke_rect(float x, float y, float width, float height) override;
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virtual void clear_rect(float x, float y, float width, float height) override;
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virtual DOM::ExceptionOr<void> draw_image_internal(CanvasImageSource const&, float source_x, float source_y, float source_width, float source_height, float destination_x, float destination_y, float destination_width, float destination_height) override;
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void set_line_width(float line_width) { drawing_state().line_width = line_width; }
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float line_width() const { return drawing_state().line_width; }
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virtual void begin_path() override;
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virtual void stroke() override;
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virtual void stroke(Path2D const& path) override;
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virtual void fill_text(String const&, float x, float y, Optional<double> max_width) override;
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virtual void stroke_text(String const&, float x, float y, Optional<double> max_width) override;
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virtual void fill(String const& fill_rule) override;
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virtual void fill(Path2D& path, String const& fill_rule) override;
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virtual RefPtr<ImageData> create_image_data(int width, int height) const override;
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virtual DOM::ExceptionOr<RefPtr<ImageData>> get_image_data(int x, int y, int width, int height) const override;
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virtual void put_image_data(ImageData const&, float x, float y) override;
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virtual void reset_to_default_state() override;
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NonnullRefPtr<HTMLCanvasElement> canvas_for_binding() const;
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virtual RefPtr<TextMetrics> measure_text(String const& text) override;
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virtual void clip() override;
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private:
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explicit CanvasRenderingContext2D(HTMLCanvasElement&);
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struct PreparedTextGlyph {
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unsigned int c;
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Gfx::IntPoint position;
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};
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struct PreparedText {
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Vector<PreparedTextGlyph> glyphs;
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Gfx::TextAlignment physical_alignment;
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Gfx::IntRect bounding_box;
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};
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void did_draw(Gfx::FloatRect const&);
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PreparedText prepare_text(String const& text, float max_width = INFINITY);
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OwnPtr<Gfx::Painter> painter();
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HTMLCanvasElement& canvas_element();
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HTMLCanvasElement const& canvas_element() const;
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void stroke_internal(Gfx::Path const&);
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void fill_internal(Gfx::Path&, String const& fill_rule);
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// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
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bool m_origin_clean { true };
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};
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enum class CanvasImageSourceUsability {
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Bad,
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Good,
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};
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DOM::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImageSource const&);
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bool image_is_not_origin_clean(CanvasImageSource const&);
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}
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