f215d9bb9a
Compositor-backed canvas contexts keep their transports tied to a single Compositor connection. When that connection dies, the 2D backing storage and WebGL GL objects disappear with it, but WebContent does not surface the loss to canvas contexts or create fresh host contexts after reconnect. Track compositor loss through the WebContent connection, mark WebGL contexts lost, dispatch the standard context events, and rebuild the remote proxy when the page opts into restoration. For 2D canvas, queue the canvas context loss steps, discard the dead backing storage, and create new storage before firing contextrestored.
92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
|
|
* Copyright (c) 2020, Andreas Kling <andreas@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Optional.h>
|
|
#include <LibGfx/Forward.h>
|
|
#include <LibWeb/HTML/HTMLElement.h>
|
|
#include <LibWeb/Painting/DisplayListResourceIds.h>
|
|
#include <LibWeb/WebIDL/Types.h>
|
|
|
|
namespace Web::HTML {
|
|
|
|
class HTMLCanvasElement final : public HTMLElement {
|
|
WEB_PLATFORM_OBJECT(HTMLCanvasElement, HTMLElement);
|
|
GC_DECLARE_ALLOCATOR(HTMLCanvasElement);
|
|
|
|
public:
|
|
static constexpr bool OVERRIDES_FINALIZE = true;
|
|
|
|
using RenderingContext = Variant<GC::Ref<CanvasRenderingContext2D>, GC::Ref<WebGL::WebGLRenderingContext>, GC::Ref<WebGL::WebGL2RenderingContext>, Empty>;
|
|
|
|
virtual ~HTMLCanvasElement() override;
|
|
|
|
Gfx::IntSize bitmap_size_for_canvas(size_t minimum_width = 0, size_t minimum_height = 0) const;
|
|
|
|
JS::ThrowCompletionOr<RenderingContext> get_context(String const& type, JS::Value options);
|
|
enum class HasOrCreatedContext {
|
|
No,
|
|
Yes,
|
|
};
|
|
JS::ThrowCompletionOr<HasOrCreatedContext> create_2d_context(JS::Value options);
|
|
|
|
WebIDL::UnsignedLong width() const;
|
|
WebIDL::UnsignedLong height() const;
|
|
|
|
void set_width(WebIDL::UnsignedLong);
|
|
void set_height(WebIDL::UnsignedLong);
|
|
|
|
virtual void attribute_changed(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
|
|
|
|
String to_data_url(StringView type, Optional<JS::Value> quality);
|
|
WebIDL::ExceptionOr<void> to_blob(GC::Ref<WebIDL::CallbackType> callback, StringView type, Optional<JS::Value> quality);
|
|
RefPtr<Gfx::Bitmap> get_bitmap_from_surface();
|
|
|
|
void prepare_for_compositing();
|
|
void notify_compositor_backing_storage_lost();
|
|
void set_canvas_content_dirty();
|
|
GC::Ptr<HTML::CanvasRenderingContext2D> canvas_rendering_context_2d() const
|
|
{
|
|
if (auto const* context = m_context.get_pointer<GC::Ref<HTML::CanvasRenderingContext2D>>())
|
|
return *context;
|
|
return nullptr;
|
|
}
|
|
|
|
Optional<Painting::CanvasId> canvas_id() const;
|
|
|
|
Optional<Gfx::IntSize> canvas_surface_content_size() const;
|
|
|
|
void ensure_backing_storage();
|
|
|
|
void notify_compositor_connection_lost();
|
|
|
|
CSS::ComputationContext canvas_font_computation_context();
|
|
|
|
private:
|
|
HTMLCanvasElement(DOM::Document&, DOM::QualifiedName);
|
|
|
|
virtual void initialize(JS::Realm&) override;
|
|
virtual void finalize() override;
|
|
virtual void visit_edges(Cell::Visitor&) override;
|
|
|
|
virtual bool is_presentational_hint(FlyString const&) const override;
|
|
virtual void apply_presentational_hints(Vector<CSS::StyleProperty>&) const override;
|
|
|
|
virtual RefPtr<Layout::Node> create_layout_node(CSS::ComputedProperties const&) override;
|
|
virtual void adjust_computed_style(CSS::ComputedProperties&) override;
|
|
|
|
template<typename ContextType>
|
|
JS::ThrowCompletionOr<HasOrCreatedContext> create_webgl_context(JS::Value options);
|
|
WebGL::WebGLRenderingContextBase* webgl_context() const;
|
|
void reset_context_to_default_state();
|
|
void notify_context_about_canvas_size_change();
|
|
|
|
Variant<GC::Ref<HTML::CanvasRenderingContext2D>, GC::Ref<WebGL::WebGLRenderingContext>, GC::Ref<WebGL::WebGL2RenderingContext>, Empty> m_context;
|
|
bool m_canvas_content_dirty { false };
|
|
};
|
|
|
|
}
|