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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/CanvasPath.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 {
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();
void set_fill_style(String);
String fill_style() const;
void set_stroke_style(String);
String stroke_style() const;
void fill_rect(float x, float y, float width, float height);
void stroke_rect(float x, float y, float width, float height);
void clear_rect(float x, float y, float width, float height);
DOM::ExceptionOr<void> draw_image(CanvasImageSource const&, float destination_x, float destination_y);
DOM::ExceptionOr<void> draw_image(CanvasImageSource const&, float destination_x, float destination_y, float destination_width, float destination_height);
DOM::ExceptionOr<void> draw_image(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);
void scale(float sx, float sy);
void translate(float x, float y);
void rotate(float degrees);
void set_line_width(float line_width) { m_drawing_state.line_width = line_width; }
float line_width() const { return m_drawing_state.line_width; }
void begin_path();
void stroke();
void fill_text(String const&, float x, float y, Optional<double> max_width);
void stroke_text(String const&, float x, float y, Optional<double> max_width);
// FIXME: We should only have one fill(), really. Fix the wrapper generator!
void fill(Gfx::Painter::WindingRule);
void fill(String const& fill_rule);
RefPtr<ImageData> create_image_data(int width, int height) const;
DOM::ExceptionOr<RefPtr<ImageData>> get_image_data(int x, int y, int width, int height) const;
void put_image_data(ImageData const&, float x, float y);
void save();
void restore();
void reset();
bool is_context_lost();
void reset_to_default_state();
NonnullRefPtr<HTMLCanvasElement> canvas_for_binding() const;
RefPtr<TextMetrics> measure_text(String const& text);
NonnullRefPtr<CanvasGradient> create_radial_gradient(double x0, double y0, double r0, double x1, double y1, double r1);
NonnullRefPtr<CanvasGradient> create_linear_gradient(double x0, double y0, double x1, double y1);
NonnullRefPtr<CanvasGradient> create_conic_gradient(double start_angle, double x, double y);
void transform(double a, double b, double c, double d, double e, double f);
void set_transform(double a, double b, double c, double d, double e, double f);
void reset_transform();
void clip();
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;
// https://html.spec.whatwg.org/multipage/canvas.html#drawing-state
struct DrawingState {
Gfx::AffineTransform transform;
Gfx::Color fill_style { Gfx::Color::Black };
Gfx::Color stroke_style { Gfx::Color::Black };
float line_width { 1 };
};
DrawingState m_drawing_state;
Vector<DrawingState> m_drawing_state_stack;
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
bool m_origin_clean { true };
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-context-lost
bool m_context_lost { false };
};
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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