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livetrax/gtk2_ardour/plugin_scan_dialog.cc

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/*
* Copyright (C) 2005-2019 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2012-2019 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef WAF_BUILD
#include "gtk2ardour-config.h"
#include "gtk2ardour-version.h"
#endif
#include <gtkmm/progressbar.h>
#include "pbd/basename.h"
#include "ardour/plugin_manager.h"
#include "ardour_ui.h"
#include "debug.h"
#include "gui_thread.h"
#include "plugin_scan_dialog.h"
#include "ui_config.h"
#include "pbd/i18n.h"
using namespace ARDOUR;
using namespace PBD;
using namespace Gtk;
using namespace std;
PluginScanDialog::PluginScanDialog (bool just_cached, bool v)
: ArdourDialog (_("Scanning for plugins"))
, timeout_button (_("Stop Timeout"))
, cancel_button (_("Cancel Plugin Scan"))
, cache_only (just_cached)
, verbose (v)
{
VBox* vbox = get_vbox();
vbox->set_size_request(400,-1);
message.set_padding (12, 12);
vbox->pack_start (message);
cancel_button.set_name ("EditorGTKButton");
cancel_button.signal_clicked().connect (sigc::mem_fun (*this, &PluginScanDialog::cancel_plugin_scan));
cancel_button.show();
vbox->pack_start (cancel_button, PACK_SHRINK);
timeout_button.set_name ("EditorGTKButton");
timeout_button.signal_clicked().connect (sigc::mem_fun (*this, &PluginScanDialog::cancel_plugin_timeout));
timeout_button.show();
pbar.set_orientation(Gtk::PROGRESS_RIGHT_TO_LEFT);
pbar.set_pulse_step (0.1);
pbar.set_text(_("Scan Timeout"));
pbar.show();
tbox.pack_start (pbar, PACK_EXPAND_WIDGET, 4);
tbox.pack_start (timeout_button, PACK_SHRINK, 4);
vbox->pack_start (tbox, PACK_SHRINK, 4);
ARDOUR::PluginScanMessage.connect (connections, MISSING_INVALIDATOR, boost::bind(&PluginScanDialog::message_handler, this, _1, _2, _3), gui_context());
ARDOUR::PluginScanTimeout.connect (connections, MISSING_INVALIDATOR, boost::bind(&PluginScanDialog::plugin_scan_timeout, this, _1), gui_context());
vbox->show_all ();
}
void
PluginScanDialog::start ()
{
/* OK, this is extremely hard to understand on first reading, so please
* read this and think about it carefully if you are confused.
*
* Plugin discovery must take place in the main thread of the
* process. This is not true for all plugin APIs but it is true for
* VST. For AU, although plugins themselves do not care, Apple decided
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* that Cocoa must be "invoked" from the main thread. Since the plugin
* might show a "registration" GUI, discovery must be done
* in the main thread.
*
* This means that the PluginManager::refresh() call MUST be made from
* the main thread (typically the GUI thread, but certainly the thread
* running main()). Failure to do this will cause crashes, undefined
* behavior and other undesirable stuff (because plugin APIs failed to
* specify this aspect of the host behavior).
*
* The ::refresh call is likely to be slow, particularly in the case of
* VST(2) plugins where we are forced to load the shared object do
* discovery (there is no separate metadata as with LV2 for
* example). This means that it will block the GUI event loop where we
* are calling it from. This is a problem.
*
* Normally we would solve this by running it in a separate thread, but
* we cannot do this for reasons described above regarding plugin
* discovery.
*
* We "solve" this by making the PluginManager emit a signal as it
* examines every new plugin. Our handler for this signal checks the
* message, and then runs ARDOUR_UI::gui_idle_handler() which flushes
* the GUI event loop of pending events. This effectively handles
* redraws and event input and all the usual stuff, meaning that the
* GUI event loop appears to continue running during the ::refresh()
* call. In reality, it only runs at the start of each plugin
* discovery, so if the discovery process for a particular plugin takes
* a long time (e.g. because it displays a licensing window and sits
* waiting for input from the user), there's nothing we can do -
* control will not be returned to our GUI event loop until that is
* finished.
*
* This is a horrible design. Truly, really horrible. But it is caused
* by plugin APIs failing to mandate that discovery can happen from any
* thread and that plugins should NOT display a GUI or interact with
* the user during discovery/instantiation. Fundamentally, all plugin
* APIs should allow discovery without instantiation, like LV2 does
* (and to a very limited extent like AU does, if you play some games
* with the lower level APIs).
*
* For now (October 2019) it is the best we can come up with that does
* not break when some VST plugin decides to behave stupidly.
*/
DEBUG_TRACE (DEBUG::GuiStartup, "plugin refresh starting\n");
PluginManager::instance().refresh (cache_only);
DEBUG_TRACE (DEBUG::GuiStartup, "plugin refresh complete\n");
/* scan is done at this point, return full control to main event loop */
}
void
PluginScanDialog::cancel_plugin_scan ()
{
PluginManager::instance().cancel_plugin_scan();
}
void
PluginScanDialog::cancel_plugin_timeout ()
{
PluginManager::instance().cancel_plugin_timeout();
timeout_button.set_sensitive (false);
}
void
PluginScanDialog::plugin_scan_timeout (int timeout)
{
if (!is_mapped()) {
return;
}
if (timeout > 0) {
pbar.set_sensitive (true);
timeout_button.set_sensitive (true);
pbar.set_fraction ((float) timeout / (float) Config->get_vst_scan_timeout());
tbox.show();
} else if (timeout < 0) {
pbar.set_sensitive (true);
pbar.pulse ();
timeout_button.set_sensitive (false);
tbox.show();
} else {
pbar.set_sensitive (false);
timeout_button.set_sensitive (false);
tbox.hide();
}
ARDOUR_UI::instance()->gui_idle_handler ();
}
void
PluginScanDialog::message_handler (std::string type, std::string plugin, bool can_cancel)
{
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DEBUG_TRACE (DEBUG::GuiStartup, string_compose (X_("plugin scan message: %1 cancel? %2\n"), type, can_cancel));
if (type == X_("closeme") && !is_mapped()) {
return;
}
const bool cancelled = PluginManager::instance().cancelled();
if (type != X_("closeme") && (!UIConfiguration::instance().get_show_plugin_scan_window()) && !verbose) {
if (cancelled && is_mapped()) {
hide();
connections.drop_connections();
ARDOUR_UI::instance()->gui_idle_handler ();
return;
}
if (cancelled || !can_cancel) {
return;
}
}
if (type == X_("closeme")) {
tbox.hide();
hide();
connections.drop_connections ();
} else {
message.set_text (type + ": " + PBD::basename_nosuffix (plugin));
show();
}
if (!can_cancel || !cancelled) {
timeout_button.set_sensitive(false);
}
cancel_button.set_sensitive(can_cancel && !cancelled);
ARDOUR_UI::instance()->gui_idle_handler ();
}