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LibGfx: Introduce a new Gfx::Painter with a Skia backend

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This new painter is written with a virtual interface from the start,
and we begin with a Skia backend.

This patch adds enough to support our basic 2D HTML canvas usecase.
This commit is contained in:
Andreas Kling 2024-07-05 15:36:55 +02:00 • committed by Andreas Kling
commit de50d27870
Notes: github-actions[bot] 2024-08-20 07:38:27 +00:00
10 changed files with 507 additions and 78 deletions
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24
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -10,9 +10,9 @@
#include <AK/String.h>
#include <AK/Variant.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/AntiAliasingPainter.h>
#include <LibGfx/Color.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
#include <LibGfx/PathClipper.h>
#include <LibWeb/Bindings/PlatformObject.h>
@ -99,6 +99,8 @@ public:
HTMLCanvasElement& canvas_element();
HTMLCanvasElement const& canvas_element() const;
[[nodiscard]] Gfx::Painter* painter();
private:
explicit CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&);
@ -118,26 +120,10 @@ private:
void did_draw(Gfx::FloatRect const&);
template<typename TDrawFunction>
void draw_clipped(TDrawFunction draw_function)
{
auto painter = this->antialiased_painter();
if (!painter.has_value())
return;
Gfx::ScopedPathClip clipper(painter->underlying_painter(), drawing_state().clip);
auto draw_rect = draw_function(*painter);
if (drawing_state().clip.has_value())
draw_rect.intersect(drawing_state().clip->path.bounding_box());
did_draw(draw_rect);
}
RefPtr<Gfx::Font const> current_font();
PreparedText prepare_text(ByteString const& text, float max_width = INFINITY);
Gfx::DeprecatedPainter* painter();
Optional<Gfx::AntiAliasingPainter> antialiased_painter();
Gfx::Path rect_path(float x, float y, float width, float height);
Gfx::Path text_path(StringView text, float x, float y, Optional<double> max_width);
@ -147,7 +133,7 @@ private:
void clip_internal(Gfx::Path&, Gfx::WindingRule);
JS::NonnullGCPtr<HTMLCanvasElement> m_element;
OwnPtr<Gfx::DeprecatedPainter> m_painter;
OwnPtr<Gfx::Painter> m_painter;
// https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
bool m_origin_clean { true };