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[wayland] Introduce automatic backend selection

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If none of the backend specific command line options are passed, we
try to autmatically determine the proper plugin.

1. if DISPLAY is set -> x11 backend
2. if WAYLAND_DISPLAY is set -> wayland backend
3. if compiled with libhybris and ANDROID_ROOT is set -> hwcomposer backend
4. if compiled with DRM -> drm backend
5. if nothing selected yet, fallback to fbdev
This commit is contained in:
Martin Gräßlin 2015-06-29 11:59:27 +02:00
parent fa7b2fd055
commit 94827c7405
1 changed files with 53 additions and 17 deletions
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70
main_wayland.cpp
View file

@ -377,6 +377,35 @@ bool EventDispatcher::hasPendingEvents()
return QEventDispatcherUNIX::hasPendingEvents() || QWindowSystemInterface::windowSystemEventsQueued();
}
static const QString s_waylandPlugin = QStringLiteral("KWinWaylandWaylandBackend");
static const QString s_x11Plugin = QStringLiteral("KWinWaylandX11Backend");
static const QString s_fbdevPlugin = QStringLiteral("KWinWaylandFbdevBackend");
#if HAVE_DRM
static const QString s_drmPlugin = QStringLiteral("KWinWaylandDrmBackend");
#endif
#if HAVE_LIBHYBRIS
static const QString s_hwcomposerPlugin = QStringLiteral("KWinWaylandHwcomposerBackend");
#endif
static QString automaticBackendSelection()
{
if (qEnvironmentVariableIsSet("WAYLAND_DISPLAY")) {
return s_waylandPlugin;
}
if (qEnvironmentVariableIsSet("DISPLAY")) {
return s_x11Plugin;
}
#if HAVE_LIBHYBRIS
if (qEnvironmentVariableIsSet("ANDROID_ROOT")) {
return s_hwcomposerPlugin;
}
#endif
#if HAVE_DRM
return s_drmPlugin;
#endif
return s_fbdevPlugin;
}
} // namespace
extern "C"
@ -524,30 +553,32 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
return 1;
}
if (parser.isSet(drmOption)) {
pluginName = QStringLiteral("KWinWaylandDrmBackend");
pluginName = KWin::s_drmPlugin;
}
#endif
bool ok = false;
const int width = parser.value(widthOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for width" << std::endl;
return 1;
}
const int height = parser.value(heightOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for height" << std::endl;
return 1;
}
initialWindowSize = QSize(width, height);
if (parser.isSet(windowedOption)) {
bool ok = false;
const int width = parser.value(widthOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for width" << std::endl;
return 1;
}
const int height = parser.value(heightOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for height" << std::endl;
return 1;
}
initialWindowSize = QSize(width, height);
if (parser.isSet(x11DisplayOption)) {
deviceIdentifier = parser.value(x11DisplayOption).toUtf8();
} else if (!parser.isSet(waylandDisplayOption)) {
deviceIdentifier = qgetenv("DISPLAY");
}
if (!deviceIdentifier.isEmpty()) {
pluginName = QStringLiteral("KWinWaylandX11Backend");
pluginName = KWin::s_x11Plugin;
} else {
if (parser.isSet(waylandDisplayOption)) {
deviceIdentifier = parser.value(waylandDisplayOption).toUtf8();
@ -555,20 +586,25 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
deviceIdentifier = qgetenv("WAYLAND_DISPLAY");
}
if (!deviceIdentifier.isEmpty()) {
pluginName = QStringLiteral("KWinWaylandWaylandBackend");
pluginName = KWin::s_waylandPlugin;
}
}
}
if (parser.isSet(framebufferOption)) {
pluginName = QStringLiteral("KWinWaylandFbdevBackend");
pluginName = KWin::s_fbdevPlugin;
deviceIdentifier = parser.value(framebufferDeviceOption).toUtf8();
}
#if HAVE_LIBHYBRIS
if (parser.isSet(hwcomposerOption)) {
pluginName = QStringLiteral("KWinWaylandHwcomposerBackend");
pluginName = KWin::s_hwcomposerPlugin;
}
#endif
if (pluginName.isEmpty()) {
std::cerr << "No backend specified through command line argument, trying auto resolution" << std::endl;
pluginName = KWin::automaticBackendSelection();
}
const auto pluginCandidates = KPluginLoader::findPlugins(QStringLiteral("org.kde.kwin.waylandbackends"),
[&pluginName] (const KPluginMetaData &plugin) {
return plugin.pluginId() == pluginName;