a80babffb6
Canvas rendering is a major remaining path where WebContent directly owns GPU-facing drawing state. Back 2D and WebGL canvas contexts with remote Compositor transports, so WebContent talks to canvas surfaces through IPC while the Compositor owns the rasterization resources. This is a large step toward GPU sandboxing because canvas GPU work now lives behind the Compositor boundary. It also gives OffscreenCanvas the process-independent canvas plumbing that HTMLCanvasElement now uses, making worker-owned canvases possible without another WebContent-local rendering path.
144 lines
6.2 KiB
C++
144 lines
6.2 KiB
C++
/*
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* Copyright (c) 2025, Ladybird contributors
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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/String.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/Path.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/DOM/EventTarget.h>
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#include <LibWeb/HTML/Canvas/CanvasCompositing.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/CanvasFilters.h>
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#include <LibWeb/HTML/Canvas/CanvasImageData.h>
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#include <LibWeb/HTML/Canvas/CanvasImageSmoothing.h>
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#include <LibWeb/HTML/Canvas/CanvasPath.h>
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#include <LibWeb/HTML/Canvas/CanvasPathDrawingStyles.h>
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#include <LibWeb/HTML/Canvas/CanvasRect.h>
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#include <LibWeb/HTML/Canvas/CanvasSettings.h>
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#include <LibWeb/HTML/Canvas/CanvasShadowStyles.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/CanvasTextDrawingStyles.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/WebIDL/ExceptionOr.h>
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#include <LibWeb/WebIDL/Types.h>
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namespace Web::HTML {
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class OffscreenCanvasRenderingContext2D : public Bindings::PlatformObject
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, public CanvasState
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, public CanvasTransform
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, public CanvasFillStrokeStyles
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, public CanvasShadowStyles
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, public CanvasFilters
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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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, public CanvasImageSmoothing
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, public CanvasCompositing
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, public CanvasSettings
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, public CanvasPathDrawingStyles
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, public CanvasTextDrawingStyles<OffscreenCanvas>
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, public CanvasPath
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{
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WEB_PLATFORM_OBJECT(OffscreenCanvasRenderingContext2D, Bindings::PlatformObject);
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GC_DECLARE_ALLOCATOR(OffscreenCanvasRenderingContext2D);
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public:
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[[nodiscard]] static JS::ThrowCompletionOr<GC::Ref<OffscreenCanvasRenderingContext2D>> create(JS::Realm&, OffscreenCanvas&, JS::Value);
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virtual ~OffscreenCanvasRenderingContext2D() override;
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GC::Ref<OffscreenCanvas> canvas();
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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 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;
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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(Utf16String const&, float x, float y, Optional<double> max_width) override;
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virtual void stroke_text(Utf16String const&, float x, float y, Optional<double> max_width) override;
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virtual void fill(StringView fill_rule) override;
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virtual void fill(Path2D& path, StringView fill_rule) override;
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virtual WebIDL::ExceptionOr<GC::Ref<ImageData>> create_image_data(int width, int height, Optional<Bindings::ImageDataSettings> const& settings = {}) const override;
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virtual WebIDL::ExceptionOr<GC::Ref<ImageData>> create_image_data(ImageData const& image_data) const override;
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virtual WebIDL::ExceptionOr<GC::Ptr<ImageData>> get_image_data(int x, int y, int width, int height, Optional<Bindings::ImageDataSettings> const& settings = {}) override;
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virtual WebIDL::ExceptionOr<void> put_image_data(ImageData&, float x, float y) override;
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virtual WebIDL::ExceptionOr<void> put_image_data(ImageData&, float x, float y, float dirty_x, float dirty_y, float dirty_width, float dirty_height) override;
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virtual void reset_to_default_state() override;
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virtual Bindings::CanvasRenderingContext2DSettings get_context_attributes() const override { return m_context_attributes; }
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virtual GC::Ref<TextMetrics> measure_text(Utf16String const&) override;
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virtual void clip(StringView fill_rule) override;
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virtual void clip(Path2D& path, StringView fill_rule) override;
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virtual bool is_point_in_path(double x, double y, StringView fill_rule) override;
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virtual bool is_point_in_path(Path2D const& path, double x, double y, StringView fill_rule) override;
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virtual bool image_smoothing_enabled() const override;
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virtual void set_image_smoothing_enabled(bool) override;
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virtual Bindings::ImageSmoothingQuality image_smoothing_quality() const override;
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virtual void set_image_smoothing_quality(Bindings::ImageSmoothingQuality) override;
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virtual float global_alpha() const override;
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virtual void set_global_alpha(float) override;
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virtual String global_composite_operation() const override;
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virtual void set_global_composite_operation(String) override;
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virtual String filter() const override;
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virtual void set_filter(String) override;
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virtual float shadow_offset_x() const override;
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virtual void set_shadow_offset_x(float) override;
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virtual float shadow_offset_y() const override;
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virtual void set_shadow_offset_y(float) override;
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virtual float shadow_blur() const override;
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virtual void set_shadow_blur(float) override;
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virtual String shadow_color() const override;
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virtual void set_shadow_color(String) override;
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void set_size(Gfx::IntSize const&);
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protected:
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[[nodiscard]] Gfx::CanvasCommandList* canvas_command_list() override;
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Variant<GC::Ref<HTMLCanvasElement>, GC::Ref<OffscreenCanvas>> canvas_element() override { return m_canvas; }
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Variant<GC::Ref<HTMLCanvasElement>, GC::Ref<OffscreenCanvas>> canvas_element() const override { return m_canvas; }
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JS::Realm& my_realm() override { return realm(); }
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Gfx::Path& mutable_path() override { return path(); }
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private:
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explicit OffscreenCanvasRenderingContext2D(JS::Realm&, OffscreenCanvas&, Bindings::CanvasRenderingContext2DSettings);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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GC::Ref<OffscreenCanvas> m_canvas;
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Gfx::IntSize m_size;
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Bindings::CanvasRenderingContext2DSettings m_context_attributes;
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};
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}
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