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Ladybird: Ignore Qt preferred fonts and just load from our fallback list

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The Qt StyleHint system didn't work on X11 anyway, and we ended up with
the default UI font being used for both `serif` and `sans-serif`.

Instead of asking Qt for something it can't do properly, let's just grab
the first available font from our list of fallbacks. This should give us
better results everywhere.
This commit is contained in:
Andreas Kling 2023-07-29 10:54:33 +02:00
parent 921aee8c66
commit de31a8a425
Notes: sideshowbarker 2024-07-16 23:34:44 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/de31a8a425
Pull-request: https://github.com/SerenityOS/serenity/pull/20253
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/AtkinsSJ
1 changed files with 21 additions and 40 deletions
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61
Ladybird/FontPluginQt.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -11,8 +11,6 @@
#include <LibCore/StandardPaths.h>
#include <LibGfx/Font/Emoji.h>
#include <LibGfx/Font/FontDatabase.h>
#include <QFont>
#include <QFontInfo>
extern DeprecatedString s_serenity_resource_root;
@ -59,44 +57,27 @@ Gfx::Font& FontPluginQt::default_fixed_width_font()
void FontPluginQt::update_generic_fonts()
{
// How we choose which system font to use for each CSS font:
// 1. Ask Qt via the QFont::StyleHint mechanism for the user's preferred font.
// 2. Try loading that font through Gfx::FontDatabase
// 3. If we don't support that font for whatever reason (e.g missing TrueType features in LibGfx)...
// 1. Try a list of known-suitable fallback fonts with their names hard-coded below
// 2. If that didn't work, fall back to Gfx::FontDatabase::default_font() (or default_fixed_width_font())
// 1. Try a list of known-suitable fonts with their names hard-coded below.
// 2. If that didn't work, fall back to Gfx::FontDatabase::default_font() (or default_fixed_width_font())
// This is rather weird, but it's how things work right now, as we can only draw with fonts loaded by LibGfx.
// This is rather weird, but it's how things work right now.
// We should eventually have a way to query the system for the default font.
// Furthermore, we should allow overriding via some kind of configuration mechanism.
m_generic_font_names.resize(static_cast<size_t>(Web::Platform::GenericFont::__Count));
auto update_mapping = [&](Web::Platform::GenericFont generic_font, QFont::StyleHint qfont_style_hint, ReadonlySpan<DeprecatedString> fallbacks) {
auto update_mapping = [&](Web::Platform::GenericFont generic_font, ReadonlySpan<DeprecatedString> fallbacks) {
if (m_is_layout_test_mode) {
m_generic_font_names[static_cast<size_t>(generic_font)] = "SerenitySans";
return;
}
QFont qt_font;
qt_font.setStyleHint(qfont_style_hint);
RefPtr<Gfx::Font const> gfx_font;
// NOTE: This is a workaround for setStyleHint being a no-op on X11 systems. See:
// https://doc.qt.io/qt-6/qfont.html#setStyleHint
if (generic_font == Web::Platform::GenericFont::Monospace)
qt_font.setFamily("monospace");
else if (generic_font == Web::Platform::GenericFont::Fantasy)
qt_font.setFamily("fantasy");
else if (generic_font == Web::Platform::GenericFont::Cursive)
qt_font.setFamily("cursive");
QFontInfo qt_info(qt_font);
auto qt_font_family = qt_info.family();
auto gfx_font = Gfx::FontDatabase::the().get(qt_font_family.toUtf8().data(), 16, 400, Gfx::FontWidth::Normal, 0, Gfx::Font::AllowInexactSizeMatch::Yes);
if (!gfx_font) {
for (auto& fallback : fallbacks) {
gfx_font = Gfx::FontDatabase::the().get(fallback, 16, 400, Gfx::FontWidth::Normal, 0, Gfx::Font::AllowInexactSizeMatch::Yes);
if (gfx_font)
break;
}
for (auto& fallback : fallbacks) {
gfx_font = Gfx::FontDatabase::the().get(fallback, 16, 400, Gfx::FontWidth::Normal, 0, Gfx::Font::AllowInexactSizeMatch::Yes);
if (gfx_font)
break;
}
if (!gfx_font) {
@ -117,15 +98,15 @@ void FontPluginQt::update_generic_fonts()
Vector<DeprecatedString> sans_serif_fallbacks { "Arial", "Helvetica", "Verdana", "Trebuchet MS", "Gill Sans", "Noto Sans", "Avantgarde", "Optima", "Arial Narrow", "Liberation Sans", "Katica" };
Vector<DeprecatedString> serif_fallbacks { "Times", "Times New Roman", "Didot", "Georgia", "Palatino", "Bookman", "New Century Schoolbook", "American Typewriter", "Liberation Serif", "Roman" };
update_mapping(Web::Platform::GenericFont::Cursive, QFont::StyleHint::Cursive, cursive_fallbacks);
update_mapping(Web::Platform::GenericFont::Fantasy, QFont::StyleHint::Fantasy, fantasy_fallbacks);
update_mapping(Web::Platform::GenericFont::Monospace, QFont::StyleHint::Monospace, monospace_fallbacks);
update_mapping(Web::Platform::GenericFont::SansSerif, QFont::StyleHint::SansSerif, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::Serif, QFont::StyleHint::Serif, serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiMonospace, QFont::StyleHint::Monospace, monospace_fallbacks);
update_mapping(Web::Platform::GenericFont::UiRounded, QFont::StyleHint::SansSerif, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiSansSerif, QFont::StyleHint::SansSerif, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiSerif, QFont::StyleHint::Serif, serif_fallbacks);
update_mapping(Web::Platform::GenericFont::Cursive, cursive_fallbacks);
update_mapping(Web::Platform::GenericFont::Fantasy, fantasy_fallbacks);
update_mapping(Web::Platform::GenericFont::Monospace, monospace_fallbacks);
update_mapping(Web::Platform::GenericFont::SansSerif, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::Serif, serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiMonospace, monospace_fallbacks);
update_mapping(Web::Platform::GenericFont::UiRounded, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiSansSerif, sans_serif_fallbacks);
update_mapping(Web::Platform::GenericFont::UiSerif, serif_fallbacks);
}
DeprecatedString FontPluginQt::generic_font_name(Web::Platform::GenericFont generic_font)