mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-06-08 05:27:14 +09:00
35efd4d14b
This is implemented by these related changes:
* The Skia alpha type 'Opaque' is selected for surfaces that were
created with the intention of not having an alpha channel.
Previously we were simply creating one with alpha.
* Clearing now happens through Skia's `clear()` which always uses the
source color's value for the result, instead of setting all values
to 0.
* CanvasRenderingContext2D selects a different clearing color based on
the `alpha` context attribute's value.
190 lines
7.7 KiB
C++
190 lines
7.7 KiB
C++
/*
|
|
* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.org>
|
|
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
|
|
* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/String.h>
|
|
#include <LibGfx/Forward.h>
|
|
#include <LibGfx/Painter.h>
|
|
#include <LibGfx/Path.h>
|
|
#include <LibGfx/TextLayout.h>
|
|
#include <LibWeb/Bindings/PlatformObject.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasCompositing.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasDrawImage.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasDrawPath.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasFilters.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasImageData.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasImageSmoothing.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasPath.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasPathDrawingStyles.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasRect.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasShadowStyles.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasState.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasText.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasTextDrawingStyles.h>
|
|
#include <LibWeb/HTML/Canvas/CanvasTransform.h>
|
|
#include <LibWeb/WebIDL/ExceptionOr.h>
|
|
|
|
namespace Web::HTML {
|
|
|
|
struct CanvasRenderingContext2DSettings {
|
|
bool alpha { true };
|
|
bool desynchronized { false };
|
|
Bindings::PredefinedColorSpace color_space { Bindings::PredefinedColorSpace::Srgb };
|
|
Bindings::CanvasColorType color_type { Bindings::CanvasColorType::Unorm8 };
|
|
bool will_read_frequently { false };
|
|
};
|
|
|
|
class CanvasRenderingContext2D
|
|
: public Bindings::PlatformObject
|
|
, public CanvasPath
|
|
, public CanvasState
|
|
, public CanvasTransform<CanvasRenderingContext2D>
|
|
, public CanvasFillStrokeStyles<CanvasRenderingContext2D>
|
|
, public CanvasShadowStyles<CanvasRenderingContext2D>
|
|
, public CanvasFilters
|
|
, public CanvasRect
|
|
, public CanvasDrawPath
|
|
, public CanvasText
|
|
, public CanvasDrawImage
|
|
, public CanvasImageData
|
|
, public CanvasImageSmoothing
|
|
, public CanvasCompositing
|
|
, public CanvasPathDrawingStyles<CanvasRenderingContext2D>
|
|
, public CanvasTextDrawingStyles<CanvasRenderingContext2D> {
|
|
|
|
WEB_PLATFORM_OBJECT(CanvasRenderingContext2D, Bindings::PlatformObject);
|
|
GC_DECLARE_ALLOCATOR(CanvasRenderingContext2D);
|
|
|
|
public:
|
|
static JS::ThrowCompletionOr<GC::Ref<CanvasRenderingContext2D>> create(JS::Realm&, HTMLCanvasElement&, JS::Value options);
|
|
virtual ~CanvasRenderingContext2D() override;
|
|
|
|
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 WebIDL::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;
|
|
|
|
virtual void begin_path() override;
|
|
virtual void stroke() override;
|
|
virtual void stroke(Path2D const& path) override;
|
|
|
|
virtual void fill_text(StringView, float x, float y, Optional<double> max_width) override;
|
|
virtual void stroke_text(StringView, float x, float y, Optional<double> max_width) override;
|
|
|
|
virtual void fill(StringView fill_rule) override;
|
|
virtual void fill(Path2D& path, StringView fill_rule) override;
|
|
|
|
virtual WebIDL::ExceptionOr<GC::Ref<ImageData>> create_image_data(int width, int height, Optional<ImageDataSettings> const& settings = {}) const override;
|
|
virtual WebIDL::ExceptionOr<GC::Ref<ImageData>> create_image_data(ImageData const& image_data) const override;
|
|
virtual WebIDL::ExceptionOr<GC::Ptr<ImageData>> get_image_data(int x, int y, int width, int height, Optional<ImageDataSettings> const& settings = {}) const override;
|
|
virtual void put_image_data(ImageData&, float x, float y) override;
|
|
|
|
virtual void reset_to_default_state() override;
|
|
|
|
GC::Ref<HTMLCanvasElement> canvas_for_binding() const;
|
|
|
|
CanvasRenderingContext2DSettings get_context_attributes() const { return m_context_attributes; }
|
|
|
|
virtual GC::Ref<TextMetrics> measure_text(StringView text) override;
|
|
|
|
virtual void clip(StringView fill_rule) override;
|
|
virtual void clip(Path2D& path, StringView fill_rule) override;
|
|
|
|
virtual bool is_point_in_path(double x, double y, StringView fill_rule) override;
|
|
virtual bool is_point_in_path(Path2D const& path, double x, double y, StringView fill_rule) override;
|
|
|
|
virtual bool image_smoothing_enabled() const override;
|
|
virtual void set_image_smoothing_enabled(bool) override;
|
|
virtual Bindings::ImageSmoothingQuality image_smoothing_quality() const override;
|
|
virtual void set_image_smoothing_quality(Bindings::ImageSmoothingQuality) override;
|
|
|
|
virtual float global_alpha() const override;
|
|
virtual void set_global_alpha(float) override;
|
|
|
|
virtual String global_composite_operation() const override;
|
|
virtual void set_global_composite_operation(String) override;
|
|
|
|
virtual String filter() const override;
|
|
virtual void set_filter(String) override;
|
|
|
|
virtual float shadow_offset_x() const override;
|
|
virtual void set_shadow_offset_x(float) override;
|
|
virtual float shadow_offset_y() const override;
|
|
virtual void set_shadow_offset_y(float) override;
|
|
virtual float shadow_blur() const override;
|
|
virtual void set_shadow_blur(float) override;
|
|
virtual String shadow_color() const override;
|
|
virtual void set_shadow_color(String) override;
|
|
|
|
HTMLCanvasElement& canvas_element();
|
|
HTMLCanvasElement const& canvas_element() const;
|
|
|
|
[[nodiscard]] Gfx::Painter* painter();
|
|
|
|
void set_size(Gfx::IntSize const&);
|
|
|
|
RefPtr<Gfx::PaintingSurface> surface() { return m_surface; }
|
|
void allocate_painting_surface_if_needed();
|
|
|
|
private:
|
|
CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&, CanvasRenderingContext2DSettings);
|
|
|
|
virtual void initialize(JS::Realm&) override;
|
|
virtual void visit_edges(Cell::Visitor&) override;
|
|
|
|
static JS::ThrowCompletionOr<CanvasRenderingContext2DSettings> context_attributes_from_options(JS::VM&, JS::Value);
|
|
|
|
virtual Gfx::Painter* painter_for_canvas_state() override { return painter(); }
|
|
virtual Gfx::Path& path_for_canvas_state() override { return path(); }
|
|
|
|
struct PreparedText {
|
|
Vector<NonnullRefPtr<Gfx::GlyphRun>> glyph_runs;
|
|
Gfx::TextAlignment physical_alignment;
|
|
Gfx::FloatRect bounding_box;
|
|
};
|
|
|
|
void did_draw(Gfx::FloatRect const&);
|
|
|
|
RefPtr<Gfx::FontCascadeList const> font_cascade_list();
|
|
|
|
PreparedText prepare_text(ByteString const& text, float max_width = INFINITY);
|
|
|
|
[[nodiscard]] Gfx::Path rect_path(float x, float y, float width, float height);
|
|
[[nodiscard]] Gfx::Path text_path(StringView text, float x, float y, Optional<double> max_width);
|
|
|
|
Gfx::Color clear_color() const;
|
|
|
|
void stroke_internal(Gfx::Path const&);
|
|
void fill_internal(Gfx::Path const&, Gfx::WindingRule);
|
|
void clip_internal(Gfx::Path&, Gfx::WindingRule);
|
|
void paint_shadow_for_fill_internal(Gfx::Path const&, Gfx::WindingRule);
|
|
void paint_shadow_for_stroke_internal(Gfx::Path const&);
|
|
|
|
GC::Ref<HTMLCanvasElement> m_element;
|
|
OwnPtr<Gfx::Painter> m_painter;
|
|
|
|
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
|
|
bool m_origin_clean { true };
|
|
|
|
Gfx::IntSize m_size;
|
|
RefPtr<Gfx::PaintingSurface> m_surface;
|
|
CanvasRenderingContext2DSettings m_context_attributes;
|
|
};
|
|
|
|
enum class CanvasImageSourceUsability {
|
|
Bad,
|
|
Good,
|
|
};
|
|
|
|
WebIDL::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImageSource const&);
|
|
bool image_is_not_origin_clean(CanvasImageSource const&);
|
|
|
|
}
|