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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmfontdatabase.h"
#include "qwasmintegration.h"
#include <QtCore/qfile.h>
#include <QtCore/private/qstdweb_p.h>
#include <QtGui/private/qguiapplication_p.h>
#include <emscripten.h>
#include <emscripten/val.h>
#include <emscripten/bind.h>
// FIXME: replace with shared implementation from qstdweb
QByteArray fromUint8Array(emscripten::val uint8array)
{
qstdweb::ArrayBuffer arrayBuffer(uint8array);
using qstdweb::Uint8Array;
Uint8Array sourceArray(arrayBuffer);
if (sourceArray.length() > std::numeric_limits<qsizetype>::max())
return QByteArray();
QByteArray destinationArray;
destinationArray.resize(sourceArray.length());
sourceArray.copyTo(destinationArray.data());
return destinationArray;
}
QT_BEGIN_NAMESPACE
using namespace emscripten;
using namespace Qt::StringLiterals;
void QWasmFontDatabase::populateFontDatabase()
{
// Load font file from resources. Currently
// all fonts needs to be bundled with the nexe
// as Qt resources.
const QString fontFileNames[] = {
QStringLiteral(":/fonts/DejaVuSansMono.ttf"),
QStringLiteral(":/fonts/Vera.ttf"),
QStringLiteral(":/fonts/DejaVuSans.ttf"),
};
for (const QString &fontFileName : fontFileNames) {
QFile theFont(fontFileName);
if (!theFont.open(QIODevice::ReadOnly))
break;
QFreeTypeFontDatabase::addTTFile(theFont.readAll(), fontFileName.toLatin1());
}
// check if local-fonts API is available in the browser
val window = val::global("window");
val fonts = window["queryLocalFonts"];
if (fonts.isUndefined())
return;
val permissions = val::global("navigator")["permissions"];
if (permissions["request"].isUndefined())
return;
val requestLocalFontsPermission = val::object();
requestLocalFontsPermission.set("name", std::string("local-fonts"));
qstdweb::PromiseCallbacks permissionRequestCallbacks {
.thenFunc = [window](val status) {
qCDebug(lcQpaFonts) << "onFontPermissionSuccess:"
<< QString::fromStdString(status["state"].as<std::string>());
// query all available local fonts and call registerFontFamily for each of them
qstdweb::Promise::make(window, "queryLocalFonts", {
.thenFunc = [](val status) {
const int count = status["length"].as<int>();
for (int i = 0; i < count; ++i) {
val font = status.call<val>("at", i);
const std::string family = font["family"].as<std::string>();
QFreeTypeFontDatabase::registerFontFamily(QString::fromStdString(family));
}
QWasmFontDatabase::notifyFontsChanged();
},
.catchFunc = [](val) {
qCWarning(lcQpaFonts)
<< "Error while trying to query local-fonts API";
}
});
},
.catchFunc = [](val error) {
qCWarning(lcQpaFonts)
<< "Error while requesting local-fonts API permission: "
<< QString::fromStdString(error["name"].as<std::string>());
}
};
// request local fonts permission (currently supported only by Chrome 103+)
qstdweb::Promise::make(permissions, "request", std::move(permissionRequestCallbacks), std::move(requestLocalFontsPermission));
}
void QWasmFontDatabase::populateFamily(const QString &familyName)
{
val window = val::global("window");
auto queryFontsArgument = val::array(std::vector<val>({ val(familyName.toStdString()) }));
val queryFont = val::object();
queryFont.set("postscriptNames", std::move(queryFontsArgument));
qstdweb::PromiseCallbacks localFontsQueryCallback {
.thenFunc = [](val status) {
val font = status.call<val>("at", 0);
if (font.isUndefined())
return;
qstdweb::PromiseCallbacks blobQueryCallback {
.thenFunc = [](val status) {
qCDebug(lcQpaFonts) << "onBlobQuerySuccess";
qstdweb::PromiseCallbacks arrayBufferCallback {
.thenFunc = [](val status) {
qCDebug(lcQpaFonts) << "onArrayBuffer" ;
QByteArray fontByteArray = fromUint8Array(status);
QFreeTypeFontDatabase::addTTFile(fontByteArray, QByteArray());
QWasmFontDatabase::notifyFontsChanged();
},
.catchFunc = [](val) {
qCWarning(lcQpaFonts) << "onArrayBufferError";
}
};
qstdweb::Promise::make(status, "arrayBuffer", std::move(arrayBufferCallback));
},
.catchFunc = [](val) {
qCWarning(lcQpaFonts) << "onBlobQueryError";
}
};
qstdweb::Promise::make(font, "blob", std::move(blobQueryCallback));
},
.catchFunc = [](val) {
qCWarning(lcQpaFonts) << "onLocalFontsQueryError";
}
};
qstdweb::Promise::make(window, "queryLocalFonts", std::move(localFontsQueryCallback), std::move(queryFont));
}
QFontEngine *QWasmFontDatabase::fontEngine(const QFontDef &fontDef, void *handle)
{
return QFreeTypeFontDatabase::fontEngine(fontDef, handle);
}
QStringList QWasmFontDatabase::fallbacksForFamily(const QString &family, QFont::Style style,
QFont::StyleHint styleHint,
QChar::Script script) const
{
QStringList fallbacks
= QFreeTypeFontDatabase::fallbacksForFamily(family, style, styleHint, script);
// Add the vera.ttf and DejaVuSans.ttf fonts (loaded in populateFontDatabase above) as falback fonts
// to all other fonts (except itself).
static const QString wasmFallbackFonts[] = { "Bitstream Vera Sans", "DejaVu Sans" };
for (auto wasmFallbackFont : wasmFallbackFonts) {
if (family != wasmFallbackFont && !fallbacks.contains(wasmFallbackFont))
fallbacks.append(wasmFallbackFont);
}
return fallbacks;
}
void QWasmFontDatabase::releaseHandle(void *handle)
{
QFreeTypeFontDatabase::releaseHandle(handle);
}
QFont QWasmFontDatabase::defaultFont() const
{
return QFont("Bitstream Vera Sans"_L1);
}
void QWasmFontDatabase::notifyFontsChanged()
{
QFontCache::instance()->clear();
emit qGuiApp->fontDatabaseChanged();
}
QT_END_NAMESPACE
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