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synced 2025-07-23 09:22:30 +00:00
4b6489917b
We apparently don't support it in the right way, since it causes the wrong font to display on https://ladybird.org.
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
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* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Font/FontSupport.h>
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#include <harfbuzz/hb.h>
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namespace Gfx {
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bool font_format_is_supported(FontFormat const format)
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{
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// FIXME: Determine these automatically.
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switch (format) {
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case FontFormat::EmbeddedOpenType:
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return false;
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case FontFormat::OpenType:
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return true;
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case FontFormat::SVG:
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return false;
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case FontFormat::TrueType:
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return true;
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case FontFormat::TrueTypeCollection:
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return true;
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case FontFormat::WOFF:
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return true;
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case FontFormat::WOFF2:
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return true;
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}
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return false;
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}
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bool font_tech_is_supported(FontTech const font_tech)
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{
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// https://drafts.csswg.org/css-fonts-4/#font-tech-definitions
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// FIXME: Determine these automatically.
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switch (font_tech) {
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case FontTech::FeaturesOpentype:
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// GSUB and GPOS, supported by HarfBuzz
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return true;
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case FontTech::FeaturesAat:
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// morx and kerx, supported by HarfBuzz
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return true;
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case FontTech::FeaturesGraphite:
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// Silf, Glat , Gloc , Feat and Sill. HarfBuzz may or may not be built with support for it.
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#if HB_HAS_GRAPHITE
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return true;
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#else
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return false;
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#endif
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case FontTech::Variations:
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// avar, cvar, fvar, gvar, HVAR, MVAR, STAT, and VVAR, supported by HarfBuzz
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// FIXME: This does not actually seem to work and causes issues with the font weight on https://ladybird.org
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return false;
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case FontTech::ColorColrv0:
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case FontTech::ColorColrv1:
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// COLR, supported by HarfBuzz
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return true;
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case FontTech::ColorSvg:
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// SVG, supported by HarfBuzz
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return true;
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case FontTech::ColorSbix:
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// sbix, supported by HarfBuzz
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return true;
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case FontTech::ColorCbdt:
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// CBDT, supported by HarfBuzz
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return true;
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case FontTech::Palettes:
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// CPAL, supported by HarfBuzz
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return true;
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case FontTech::Incremental:
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// Incremental Font Transfer: https://w3c.github.io/IFT/Overview.html
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return false;
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// https://drafts.csswg.org/css-fonts-5/#font-tech-definitions
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case FontTech::Avar2:
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// avar version 2, supported by HarfBuzz
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return true;
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}
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return false;
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}
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}
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