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[708] 确保 WASM 构建中正常显示字符 #3678

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[708] 确保 WASM 构建中正常显示字符 #3678

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40 changes: 40 additions & 0 deletions src/Plugins/Qt/qt_gui.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,10 @@
#include <QCoreApplication>
#include <QFileInfo>
#include <QFileOpenEvent>
#ifdef OS_WASM
#include <QFont>
#include <QFontDatabase>
#endif
#include <QImage>
#include <QLabel>
#include <QLibraryInfo>
Expand Down Expand Up @@ -104,6 +108,39 @@ bool qt_startup_quit_requested= false;
* FIXME: temporary hack by Joris
* Additional wait mechanism to keep CPU usage down
******************************************************************************/
#ifdef OS_WASM
static void
ensure_wasm_widget_fonts () {
QStringList font_files;
font_files << "/TeXmacs/fonts/truetype/DejaVuSans.ttf"
<< "/TeXmacs/fonts/truetype/DejaVuSans-Bold.ttf"
<< "/TeXmacs/fonts/truetype/DejaVuSansMono.ttf"
<< "/TeXmacs/fonts/truetype/DejaVuSansMono-Bold.ttf"
<< "/TeXmacs/fonts/truetype/DejaVuSerif.ttf"
<< "/TeXmacs/fonts/truetype/DejaVuSerif-Bold.ttf";

QString first_family;
for (int i= 0; i < font_files.size (); ++i) {
int font_id= QFontDatabase::addApplicationFont (font_files[i]);
if (font_id < 0) continue;

QStringList families= QFontDatabase::applicationFontFamilies (font_id);
if (first_family.isEmpty () && !families.isEmpty ())
first_family= families.first ();
}

if (first_family.isEmpty ()) return;

QFont::insertSubstitution ("Sans Serif", first_family);
QFont::insertSubstitution ("Helvetica", first_family);
QFont::insertSubstitution ("Arial", first_family);
QFont::insertSubstitution ("Monospace", "DejaVu Sans Mono");

QFont app_font= qApp->font ();
app_font.setFamily (first_family);
qApp->setFont (app_font);
}
#endif

#ifdef QT_CPU_FIX
#include <unistd.h>
Expand Down Expand Up @@ -154,6 +191,9 @@ qt_gui_rep::qt_gui_rep (int& argc, char** argv)
extern void mac_install_filter (); // defined in src/Plugins/MacOS/mac_app.mm
mac_install_filter ();
#endif
#ifdef OS_WASM
ensure_wasm_widget_fonts ();
#endif

set_output_language (get_locale_language ());
refresh_language ();
Expand Down
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