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Port to Qt 6 #21

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2fef136
Port to Qt 6 and add command line arguments for embedding
alexispurslane Oct 27, 2023
7154efc
switch to Qt 6 text encoding/decoding handling to get rid of qt5compat
alexispurslane Oct 28, 2023
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2 changes: 2 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -10,3 +10,5 @@
/qtads.pro.user*
/qrc_resources.cpp
/.qmake.stash
.cache
compile_commands.json
38 changes: 17 additions & 21 deletions src/confdialog.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
#include "confdialog.h"

#include "globals.h"
#include "qstringconverter_base.h"
#include "settings.h"
#include "sysframe.h"
#include "syswingroup.h"
Expand All @@ -10,7 +11,9 @@
#include <QCheckBox>
#include <QColorDialog>
#include <QPushButton>
#include <QTextCodec>
#include <QStringConverter>
#include <QStringDecoder>
#include <QStringEncoder>
#include <algorithm>
#include <vector>

Expand Down Expand Up @@ -40,27 +43,20 @@ ConfDialog::ConfDialog(CHtmlSysWinGroupQt* const parent)
ui->linkClickedColorButton->setFixedSize(macSize);
#endif

const auto aliases = QTextCodec::availableCodecs();
std::vector<QByteArray> codecs;
for (const auto& alias : aliases) {
auto codecName = QTextCodec::codecForName(alias)->name();
// Only allow some of the possible sets, otherwise we would get a big
// list with most of the encodings being irrelevant. The only Unicode
// encoding we allow is UTF-8, since it's a single-byte character set
// and therefore can be used by TADS 2 games (though I'm not aware of
// any that actually use UTF-8.)
if (codecName == "UTF-8" or codecName.startsWith("windows-") or codecName.startsWith("ISO-")
or codecName.startsWith("KOI8-") or codecName.startsWith("IBM")
or codecName.startsWith("EUC-") or codecName.startsWith("jisx020")
or codecName.startsWith("cp949"))
{
codecs.emplace_back(std::move(codecName));
}
}
std::sort(codecs.begin(), codecs.end());
const QStringConverter::Encoding codecs[9]{
QStringConverter::Encoding::System, QStringConverter::Encoding::Latin1,
QStringConverter::Encoding::Utf16, QStringConverter::Encoding::Utf16BE,
QStringConverter::Encoding::Utf16LE, QStringConverter::Encoding::Utf32,
QStringConverter::Encoding::Utf32BE, QStringConverter::Encoding::Utf32LE,
QStringConverter::Encoding::Utf8,
};
Comment on lines +46 to +52

@ferdnyc ferdnyc Sep 6, 2025

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I don't think this list actually makes much sense. As the comment in the removed code said, in the original set only UTF-8 was included (despite even that not being common in practice) because at least TADS 2 has a one-byte-per-character format. So UTF16 is unlikely-to-impossible, and I don't think I've ever seen UTF32-encoded... anything. Anywhere. Ever.

On my (Fedora Linux) system, presumably thanks to the ICU library, QStringConverter::availableCodecs() produces a list of 233 codecs, pretty much a drop-in replacement for QTextCodec::availableCodecs(). Filtering that list by the same criteria as the old code leaves these 78:

['UTF-8',
 'ISO-8859-1',
 'ISO-8859-2',
 'ISO-8859-3',
 'ISO-8859-4',
 'ISO-8859-5',
 'ISO-8859-6',
 'ISO-8859-7',
 'ISO-8859-8',
 'ISO-8859-9',
 'ISO-8859-10',
 'ISO-8859-13',
 'ISO-8859-14',
 'ISO-8859-15',
 'EUC-JP',
 'EUC-KR',
 'windows-874-2000',
 'IBM437',
 'IBM775',
 'IBM850',
 'IBM852',
 'IBM855',
 'IBM857',
 'IBM00858',
 'IBM860',
 'IBM861',
 'IBM862',
 'IBM863',
 'IBM864',
 'IBM865',
 'IBM866',
 'IBM868',
 'IBM869',
 'KOI8-R',
 'KOI8-U',
 'windows-1250',
 'windows-1251',
 'windows-1252',
 'windows-1253',
 'windows-1254',
 'windows-1255',
 'windows-1256',
 'windows-1257',
 'windows-1258',
 'ISO-2022-JP',
 'ISO-2022-JP-1',
 'ISO-2022-JP-2',
 'ISO-2022-KR',
 'ISO-2022-CN',
 'ISO-2022-CN-EXT',
 'IBM037',
 'IBM273',
 'IBM277',
 'IBM278',
 'IBM280',
 'IBM284',
 'IBM285',
 'IBM290',
 'IBM297',
 'IBM420',
 'IBM424',
 'IBM500',
 'IBM-Thai',
 'IBM870',
 'IBM871',
 'IBM918',
 'IBM1026',
 'IBM1047',
 'IBM01140',
 'IBM01141',
 'IBM01142',
 'IBM01143',
 'IBM01144',
 'IBM01145',
 'IBM01146',
 'IBM01147',
 'IBM01148',
 'IBM01149']

That's probably excessive, but OTOH some legacy codecs like windows-1250, windows-1252, ISO-8859-15, etc. were extremely common in older files, and still come up fairly often even today.

for (const auto& codec : codecs) {
if (ui->encodingComboBox->findText(QString::fromLatin1(codec)) == -1) {
ui->encodingComboBox->addItem(QString::fromLatin1(codec));
if (ui->encodingComboBox->findText(
QString::fromLatin1(QStringConverter::nameForEncoding(codec)))

@ferdnyc ferdnyc Sep 6, 2025

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According to QStringConverter's docs, nameForEncoding() outputs a const char * string that's UTF-8 encoded, so fromLatin1() sounds like the wrong interpretation. It's probably best to just drop it, since QString will default to interpreting char * as UTF-8 anyway.

(fromLatin1() is used to override that default when dealing with strings that can be processed faster as 8-bit Latin1. But the names returned by nameForEncoding() aren't guaranteed to be 8-bit fixed-width.)

== -1)
{
ui->encodingComboBox->addItem(
QString::fromLatin1(QStringConverter::nameForEncoding(codec)));
}
}

Expand Down
12 changes: 5 additions & 7 deletions src/kcolorbutton.cc
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Expand Up @@ -232,9 +232,9 @@ void KColorButton::paintEvent(QPaintEvent *)
if (hasFocus()) {
QRect focusRect = style->subElementRect(QStyle::SE_PushButtonFocusRect, &butOpt, this);
QStyleOptionFocusRect focusOpt;
focusOpt.init(this);
focusOpt.initFrom(this);
focusOpt.rect = focusRect;
focusOpt.backgroundColor = palette().background().color();
focusOpt.backgroundColor = palette().window().color();
style->drawPrimitive(QStyle::PE_FrameFocusRect, &focusOpt, &painter, this);
}
}
Expand All @@ -243,16 +243,14 @@ QSize KColorButton::sizeHint() const
{
QStyleOptionButton opt;
d->initStyleOption(&opt);
return style()->sizeFromContents(QStyle::CT_PushButton, &opt, QSize(40, 15), this).
expandedTo(QApplication::globalStrut());
return style()->sizeFromContents(QStyle::CT_PushButton, &opt, QSize(40, 15), this);
}

QSize KColorButton::minimumSizeHint() const
{
QStyleOptionButton opt;
d->initStyleOption(&opt);
return style()->sizeFromContents(QStyle::CT_PushButton, &opt, QSize(3, 3), this).
expandedTo(QApplication::globalStrut());
return style()->sizeFromContents(QStyle::CT_PushButton, &opt, QSize(3, 3), this);
}

void KColorButton::dragEnterEvent(QDragEnterEvent *event)
Expand Down Expand Up @@ -294,7 +292,7 @@ void KColorButton::mouseMoveEvent(QMouseEvent *e)
{
if ((e->buttons() & Qt::LeftButton) &&
(e->pos() - d->mPos).manhattanLength() > QApplication::startDragDistance()) {
_k_createDrag(color(), this)->start();
_k_createDrag(color(), this)->exec();
setDown(false);
}
}
Expand Down
61 changes: 48 additions & 13 deletions src/main.cc
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Expand Up @@ -21,29 +21,63 @@
auto main(int argc, char** argv) -> int
{
CHtmlResType::add_basic_types();
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
// No need to enable High Dpi scaling because it's always on
#elif QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
CHtmlSysFrameQt* app = new CHtmlSysFrameQt(
argc, argv, "QTads", QTADS_VERSION, "Nikos Chantziaras", {});
CHtmlSysFrameQt* app =
new CHtmlSysFrameQt(argc, argv, "QTads", QTADS_VERSION, "Nikos Chantziaras", {});
#if QT_VERSION <= QT_VERSION_CHECK(6, 0, 0)
QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
#endif
#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
QApplication::setDesktopFileName("nikos.chantziaras.qtads");
#endif

// Filename of the game to run.
QString gameFileName;
bool embed = false;

const QStringList& args = app->arguments();
if (args.size() == 2) {
if (QFile::exists(args.at(1))) {
gameFileName = args.at(1);
} else if (QFile::exists(args.at(1) + ".gam")) {
gameFileName = args.at(1) + ".gam";
} else if (QFile::exists(args.at(1) + ".t3")) {
gameFileName = args.at(1) + ".t3";
} else {
qWarning() << "File" << args.at(1) << "not found.";
if (args.size() >= 1) {

@ferdnyc ferdnyc Sep 6, 2025

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Suggestion: Replace all of this tedious manual command-line parsing with,

#include <QCommandLineParser>

// ...

auto main(int argc, char** argv) -> int {

    QString gameFileName;
    bool embedOption = false;

    // ...

    QCommandLineParser parser;
    parser.setApplicationDescription("QTads: Interpreter for TADS 2 and 3 game files");
    parser.addHelpOption();
    parser.addVersionOption();
    parser.addPositionalArgument("FILE", "Game file to load");
    parser.addOptions({
                       {{"e", "embed"},
                        "Print the QTads window ID to stdout on startup (for embedding)"},
                       });

    parser.process(app);

    const QStringList args = parser.positionalArguments();

    embedOption = parser.isSet("embed");

    if (args.length() > 0) {
        gameFileName = checkFileName(args.at(0));
        if (gameFileName.isEmpty()) {
            qWarning() << "File" << args.at(0) << "not found.";
        }
    }

(And a helper checkFileName, something like:)

auto checkFileName(const QString& input) -> QString {
    QStringList fileExtensions;
    fileExtensions  << QLatin1String("")
                    << QStringLiteral(".gam")
                    << QStringLiteral(".t3");

    for (auto& ext : fileExtensions) {
        QString name = input + ext;
        if (QFile::exists(name)) {
            return name;
        }
    }
    return nullptr;
}

Qt will handle processing of -h / --help, -v / --version, failing with a message when given unrecognized arguments, and all of the other tedium involved in command-line parsing. When called with --help / --h it'll output something like this:

$ qtads --help
Usage: qtads [options] FILE
QTads: Interpreter for TADS 2 and 3 game files

Options:
  -h, --help     Displays help on commandline options.
  --help-all     Displays help including Qt specific options.
  -v, --version  Displays version information.
  -e, --embed    Print the QTads window ID to stdout on startup (for embedding)

Arguments:
  FILE           Game file to load

The Windows version will even show the help in a window, if QTads is launched from a script or desktop shortcut with a bad argument, instead of in a shell.

bool prevNonFlagArgument = false;

for (int i = 1; i < args.size(); ++i) {
const auto& arg = args.at(i);

if (!arg.startsWith("-")) {
if (prevNonFlagArgument) {
qWarning() << "It looks like you specified more than one non-flag command-line"
<< "argument at" << arg
<< "but QTADS can only accept one game file, so only the"
<< "first non flag argument will be used.";
} else if (gameFileName.isNull()) {
if (QFile::exists(arg)) {
gameFileName = arg;
} else if (QFile::exists(arg + ".gam")) {
gameFileName = arg + ".gam";
} else if (QFile::exists(arg + ".t3")) {
gameFileName = arg + ".t3";
} else {
qWarning() << "File" << arg << "not found.";
}
}

prevNonFlagArgument = true;
} else if (arg == "--help" || arg == "-h") {
qInfo() << "qtads [OPTIONS] [FILE]\n"
<< "\t--help\t\tThis help message\n"
<< "\t--embed\t\tPrint out the window id on startup so that qtads can be "
"embedded\n"
<< "\t-h\t\tSame as --help\n"
<< "\t-e\t\tSame as --embed";
} else if (arg == "--embed" || arg == "-e") {
embed = true;
} else {
qWarning() << "Unrecognized command line argument " << arg << ".";
return 1;
}
}
}

Expand All @@ -60,7 +94,8 @@ auto main(int argc, char** argv) -> int
}
#endif

QTimer::singleShot(0, app, [app, gameFileName] { app->entryPoint(gameFileName); });
QTimer::singleShot(
0, app, [app, embed, gameFileName] { app->entryPoint(gameFileName, embed); });
int ret = CHtmlSysFrameQt::exec();

delete app;
Expand Down
4 changes: 3 additions & 1 deletion src/missing.cc
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
// This is copyrighted software. More information is at the end of this file.
#include <QDebug>
#include <QString>
#include <QTextCodec>
#include <QStringConverter>
#include <QStringDecoder>
#include <QStringEncoder>
#include <cctype>
#include <cstdlib>
#include <cstring>
Expand Down
40 changes: 29 additions & 11 deletions src/osqt.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
*/

// Make sure we get vasprintf() from cstdio, which in mingw is a GNU extension.
#include "qstringconverter_base.h"
#if defined(__MINGW32__) and not defined(_GNU_SOURCE)
#define _GNU_SOURCE
#define GNU_SOURCE_DEFINED
Expand All @@ -35,9 +36,11 @@
#include <QMessageBox>
#include <QPushButton>
#include <QStandardPaths>
#include <QStringConverter>
#include <QStringDecoder>
#include <QStringEncoder>
#include <QSysInfo>
#include <QTemporaryFile>
#include <QTextCodec>
#include <QTimer>
#include <algorithm>
#include <chrono>
Expand Down Expand Up @@ -615,8 +618,18 @@ auto os_strlwr(char* const s) -> char*
if (qFrame->tads3()) {
lower = QString::fromUtf8(s).toLower().toUtf8();
} else {
const auto* const codec = QTextCodec::codecForName(qFrame->settings().tads2Encoding);
lower = codec->fromUnicode(codec->toUnicode(s).toLower());
auto codec = QStringConverter::encodingForName(qFrame->settings().tads2Encoding);
if (codec.has_value()) {
QStringEncoder toUnicode{codec.value()};
const QByteArray encoded = toUnicode.encode(QString::fromLocal8Bit(s));
if (!toUnicode.hasError()) {
QStringDecoder fromUnicode{codec.value()};
auto decoded = fromUnicode.decode(encoded.toLower());
if (!fromUnicode.hasError()) {
lower = decoded.data;
}
}
}
}
std::memcpy(s, lower.constData(), lower.size() + 1);
return s;
Expand Down Expand Up @@ -678,7 +691,7 @@ void os_get_special_path(

case OS_GSP_T3_APP_DATA:
case OS_GSP_LOGFILE: {
const auto dirStr = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
const auto dirStr = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
QDir dir(dirStr);
QByteArray result;
// Create the directory if it doesn't exist.
Expand Down Expand Up @@ -1304,9 +1317,10 @@ auto os_askfile(
filter += ";;" + QObject::tr("All Files") + " (*)";
}

const auto promptStr = qFrame->tads3()
? QString::fromUtf8(prompt)
: QTextCodec::codecForName(qFrame->settings().tads2Encoding)->toUnicode(prompt);
QStringEncoder toUnicode{
QStringConverter::encodingForName(qFrame->settings().tads2Encoding).value()};
const auto promptStr = qFrame->tads3() ? QString::fromUtf8(prompt)
: toUnicode(QString::fromLocal8Bit(prompt)).data;
const auto filename = prompt_type == OS_AFP_OPEN
? QFileDialog::getOpenFileName(qFrame->gameWindow(), promptStr, QDir::currentPath(), filter)
: QFileDialog::getSaveFileName(
Expand Down Expand Up @@ -1358,9 +1372,12 @@ auto os_input_dialog(
QMessageBox dialog(qWinGroup);

// We'll use that if we're running a T2 game.
const auto* const t2Codec = QTextCodec::codecForName(qFrame->settings().tads2Encoding);
QStringEncoder t2ToUnicode{
QStringConverter::encodingForName(qFrame->settings().tads2Encoding).value()};

dialog.setText(qFrame->tads3() ? QString::fromUtf8(prompt) : t2Codec->toUnicode(prompt));
dialog.setText(
qFrame->tads3() ? QString::fromUtf8(prompt)
: t2ToUnicode(QString::fromLocal8Bit(prompt)).data);

switch (icon_id) {
case OS_INDLG_ICON_NONE:
Expand Down Expand Up @@ -1405,8 +1422,9 @@ auto os_input_dialog(
} else {
for (int i = 0; i < button_count; ++i) {
Q_ASSERT(buttons[i] != nullptr);
const auto buttonText =
qFrame->tads3() ? QString::fromUtf8(buttons[i]) : t2Codec->toUnicode(buttons[i]);
const auto buttonText = qFrame->tads3()
? QString::fromUtf8(buttons[i])
: t2ToUnicode(QString::fromLocal8Bit(buttons[i])).data;
buttonList += dialog.addButton(buttonText, QMessageBox::AcceptRole);
}
}
Expand Down
33 changes: 21 additions & 12 deletions src/sysframe.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -8,10 +8,14 @@
#include <QMessageBox>
#include <QScreen>
#include <QStatusBar>
#include <QTextCodec>
#include <QStringConverter>
#include <QStringDecoder>
#include <QStringEncoder>
#include <Qt>
#include <cstdlib>

#include "gameinfodialog.h"
#include "qstringconverter_base.h"
#include "qtadshostifc.h"
#include "qtadssound.h"
#include "syswinaboutbox.h"
Expand Down Expand Up @@ -335,7 +339,7 @@ bool CHtmlSysFrameQt::event(QEvent* e)
}
#endif

void CHtmlSysFrameQt::entryPoint(QString gameFileName)
void CHtmlSysFrameQt::entryPoint(QString gameFileName, bool embed)
{
// Restore the application's size and position.
if (not fSettings.appGeometry.isEmpty()) {
Expand All @@ -344,6 +348,8 @@ void CHtmlSysFrameQt::entryPoint(QString gameFileName)
auto h = QApplication::primaryScreen()->availableSize().height() / 1.1;
fMainWin->resize(h, h);
}
if (embed)
qInfo() << "WinId: " << fMainWin->winId();
fMainWin->show();

// Do an online update check.
Expand Down Expand Up @@ -392,8 +398,10 @@ static auto find_font_match(const std::vector<QString>& font_names) -> QString
return system_font;
}
// Also try the font name without the "[foundry]" part.
auto clean_font_name = font_name.leftRef(font_name.lastIndexOf('[')).trimmed();
auto clean_system_font = system_font.leftRef(system_font.lastIndexOf('[')).trimmed();
QStringView font_view{font_name};
auto clean_font_name = font_view.left(font_name.lastIndexOf('[')).trimmed();
QStringView system_font_view{system_font};
auto clean_system_font = system_font_view.left(system_font.lastIndexOf('[')).trimmed();
if (clean_font_name.compare(clean_system_font, Qt::CaseInsensitive) == 0) {
return system_font;
}
Expand Down Expand Up @@ -457,7 +465,7 @@ auto CHtmlSysFrameQt::createFont(const CHtmlFontDesc* font_desc) -> CHtmlSysFont
// The face name field can contain multiple face names separated by
// commas. We split them into a list and try each one individualy.
const auto strList =
QString(QString::fromLatin1(newFontDesc.face)).split(',', QString::SkipEmptyParts);
QString(QString::fromLatin1(newFontDesc.face)).split(',', Qt::SkipEmptyParts);
for (int i = 0; i < strList.size(); ++i) {
auto s = strList.at(i).simplified().toLower();
if (s == QString::fromLatin1(HTMLFONT_TADS_SERIF).toLower()) {
Expand Down Expand Up @@ -591,8 +599,7 @@ auto CHtmlSysFrameQt::createFont(const CHtmlFontDesc* font_desc) -> CHtmlSysFont
// Workaround for QTBUG-76908 (wrong font variant is used and is out of sync with font metrics.)
new_font.setStyleName({});

new_font.setStyleStrategy(QFont::StyleStrategy(
QFont::PreferOutline | QFont::PreferQuality | QFont::ForceIntegerMetrics));
new_font.setStyleStrategy(QFont::StyleStrategy(QFont::PreferOutline | QFont::PreferQuality));
new_font.setUnderline(newFontDesc.underline);
new_font.setStrikeOut(newFontDesc.strikeout);
if (use_bold and weight < QFont::Bold) {
Expand Down Expand Up @@ -807,8 +814,9 @@ void CHtmlSysFrameQt::display_output(const textchar_t* buf, size_t len)
fBuffer.append(buf, len);
} else {
// TADS 2 does not use UTF-8; use the encoding from our settings.
QTextCodec* codec = QTextCodec::codecForName(fSettings.tads2Encoding);
fBuffer.append(codec->toUnicode(buf, len).toUtf8().constData());
QStringEncoder toUnicode{
QStringConverter::encodingForName(fSettings.tads2Encoding).value()};
fBuffer.append(toUnicode(QString::fromLocal8Bit(buf, len)).data.toLocal8Bit());
}
}

Expand Down Expand Up @@ -895,9 +903,10 @@ auto CHtmlSysFrameQt::get_input_event(unsigned long timeout, int use_timeout, os
info->href, fGameWin->pendingHrefEvent().toUtf8().constData(),
sizeof(info->href) - 1);
} else {
QTextCodec* codec = QTextCodec::codecForName(fSettings.tads2Encoding);
QStringDecoder fromUnicode{
QStringConverter::encodingForName(fSettings.tads2Encoding).value()};
strncpy(
info->href, codec->fromUnicode(fGameWin->pendingHrefEvent()).constData(),
info->href, fromUnicode(fGameWin->pendingHrefEvent().toUtf8()).data,
sizeof(info->href) - 1);
}
info->href[sizeof(info->href) - 1] = '\0';
Expand Down Expand Up @@ -1076,7 +1085,7 @@ void CHtmlSysFrameQt::remove_banner_window(CHtmlSysWin* win)

auto CHtmlSysFrameQt::get_exe_resource(
const textchar_t* /*resname*/, size_t /*resnamelen*/, textchar_t* /*fname_buf*/,
size_t /*fname_buf_len*/, unsigned long* /*seek_pos*/, unsigned long * /*siz*/) -> int
size_t /*fname_buf_len*/, unsigned long* /*seek_pos*/, unsigned long* /*siz*/) -> int
{
// qDebug() << Q_FUNC_INFO;
// qDebug() << "resname:" << resname << "fname_buf:" << fname_buf << "seek_pos:" << seek_pos;
Expand Down
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