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LibGfx+LibWeb: Support per-glyph font fallbacks in canvas text painting

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Instead of using the first font from the FontCascadeList for all glyphs
in a text, we perform a text shaping process that finds a suitable font
for each glyph and returns a list of glyph runs, where each glyph run
represents consecutive glyphs using the same font.
This commit is contained in:
Aliaksandr Kalenik 2025-04-19 21:36:26 +02:00 • committed by Andreas Kling
commit f6b0851c38
Notes: github-actions[bot] 2025-04-21 07:52:18 +00:00
3 changed files with 49 additions and 4 deletions
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3
Libraries/LibGfx/TextLayout.h
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@ -1,6 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
* Copyright (c) 2024-2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -12,6 +13,7 @@
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/FontCascadeList.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Point.h>
@ -69,6 +71,7 @@ private:
};
RefPtr<GlyphRun> shape_text(FloatPoint baseline_start, float letter_spacing, Utf8View string, Gfx::Font const& font, GlyphRun::TextType, ShapeFeatures const& features);
Vector<NonnullRefPtr<GlyphRun>> shape_text(FloatPoint baseline_start, Utf8View string, FontCascadeList const&);
float measure_text_width(Utf8View const& string, Gfx::Font const& font, ShapeFeatures const& features);
}