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LibWeb: Add Canvas Context2D basic text align and text baseline support

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Add the CanvasTextDrawingStyles mixin with the textAlign and
textBaseline attributes. Update fill_text in CanvasRenderingContext2D
to move the text rect by the text align and text baseline attributes.
Wrote a simple HTML example to showcase the new features.
This commit is contained in:
Bastiaan van der Plaat 2023-08-03 12:18:17 +02:00 • committed by Andreas Kling
parent e689422564
commit 220e34b69d
9 changed files with 159 additions and 9 deletions
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33
Userland/Libraries/LibWeb/HTML/Canvas/CanvasTextDrawingStyles.h Normal file
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/*
* Copyright (c) 2023, Bastiaan van der Plaat <bastiaan.v.d.plaat@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/HTML/Canvas/CanvasState.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/canvas.html#canvastextdrawingstyles
template<typename IncludingClass>
class CanvasTextDrawingStyles {
public:
~CanvasTextDrawingStyles() = default;
void set_text_align(Bindings::CanvasTextAlign text_align) { my_drawing_state().text_align = text_align; }
Bindings::CanvasTextAlign text_align() const { return my_drawing_state().text_align; }
void set_text_baseline(Bindings::CanvasTextBaseline text_baseline) { my_drawing_state().text_baseline = text_baseline; }
Bindings::CanvasTextBaseline text_baseline() const { return my_drawing_state().text_baseline; }
protected:
CanvasTextDrawingStyles() = default;
private:
CanvasState::DrawingState& my_drawing_state() { return reinterpret_cast<IncludingClass&>(*this).drawing_state(); }
CanvasState::DrawingState const& my_drawing_state() const { return reinterpret_cast<IncludingClass const&>(*this).drawing_state(); }
};
}