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/*
* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefCountForwarder.h>
#include <AK/Variant.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/Color.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
#include <LibWeb/Bindings/Wrappable.h>
#include <LibWeb/DOM/ExceptionOr.h>
#include <LibWeb/HTML/Canvas/CanvasDrawImage.h>
#include <LibWeb/HTML/Canvas/CanvasDrawPath.h>
#include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>
#include <LibWeb/HTML/Canvas/CanvasImageData.h>
#include <LibWeb/HTML/Canvas/CanvasPath.h>
#include <LibWeb/HTML/Canvas/CanvasRect.h>
#include <LibWeb/HTML/Canvas/CanvasState.h>
#include <LibWeb/HTML/Canvas/CanvasText.h>
#include <LibWeb/HTML/Canvas/CanvasTransform.h>
#include <LibWeb/HTML/CanvasGradient.h>
#include <LibWeb/Layout/InlineNode.h>
#include <LibWeb/Layout/LineBox.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/canvas.html#canvasimagesource
// NOTE: This is the Variant created by the IDL wrapper generator, and needs to be updated accordingly.
using CanvasImageSource = Variant<NonnullRefPtr<HTMLImageElement>, NonnullRefPtr<HTMLCanvasElement>>;
class CanvasRenderingContext2D
: public RefCountForwarder<HTMLCanvasElement>
, public Bindings::Wrappable
, public CanvasPath
, public CanvasState
, public CanvasTransform<CanvasRenderingContext2D>
, public CanvasFillStrokeStyles<CanvasRenderingContext2D>
, public CanvasRect
, public CanvasDrawPath
, public CanvasText
, public CanvasDrawImage
, public CanvasImageData {
AK_MAKE_NONCOPYABLE(CanvasRenderingContext2D);
AK_MAKE_NONMOVABLE(CanvasRenderingContext2D);
public:
using WrapperType = Bindings::CanvasRenderingContext2DWrapper;
static NonnullRefPtr<CanvasRenderingContext2D> create(HTMLCanvasElement& element) { return adopt_ref(*new CanvasRenderingContext2D(element)); }
~CanvasRenderingContext2D();
virtual void fill_rect(float x, float y, float width, float height) override;
virtual void stroke_rect(float x, float y, float width, float height) override;
virtual void clear_rect(float x, float y, float width, float height) override;
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;
void set_line_width(float line_width) { drawing_state().line_width = line_width; }
float line_width() const { return drawing_state().line_width; }
virtual void begin_path() override;
virtual void stroke() override;
virtual void stroke(Path2D const& path) override;
virtual void fill_text(String const&, float x, float y, Optional<double> max_width) override;
virtual void stroke_text(String const&, float x, float y, Optional<double> max_width) override;
virtual void fill(String const& fill_rule) override;
virtual void fill(Path2D& path, String const& fill_rule) override;
virtual RefPtr<ImageData> create_image_data(int width, int height) const override;
virtual DOM::ExceptionOr<RefPtr<ImageData>> get_image_data(int x, int y, int width, int height) const override;
virtual void put_image_data(ImageData const&, float x, float y) override;
virtual void reset_to_default_state() override;
NonnullRefPtr<HTMLCanvasElement> canvas_for_binding() const;
virtual RefPtr<TextMetrics> measure_text(String const& text) override;
virtual void clip() override;
private:
explicit CanvasRenderingContext2D(HTMLCanvasElement&);
struct PreparedTextGlyph {
unsigned int c;
Gfx::IntPoint position;
};
struct PreparedText {
Vector<PreparedTextGlyph> glyphs;
Gfx::TextAlignment physical_alignment;
Gfx::IntRect bounding_box;
};
void did_draw(Gfx::FloatRect const&);
PreparedText prepare_text(String const& text, float max_width = INFINITY);
OwnPtr<Gfx::Painter> painter();
HTMLCanvasElement& canvas_element();
HTMLCanvasElement const& canvas_element() const;
void stroke_internal(Gfx::Path const&);
void fill_internal(Gfx::Path&, String const& fill_rule);
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
bool m_origin_clean { true };
};
enum class CanvasImageSourceUsability {
Bad,
Good,
};
DOM::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImageSource const&);
bool image_is_not_origin_clean(CanvasImageSource const&);
}
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