Implement unused Lv2UridCache

include/Lv2Manager.h

@@ -34,6 +34,7 @@
 #include <lilv/lilv.h>
 
 #include "Lv2Basics.h"
+#include "Lv2UridCache.h"
 #include "Lv2UridMap.h"
 #include "Plugin.h"
 
@@ -123,7 +124,7 @@ public:
 	};
 
 	UridMap& uridMap() { return m_uridMap; }
-	//! Return all
+	const Lv2UridCache& uridCache() const { return m_uridCache; }
 	const std::set<const char*, CmpStr>& supportedFeatureURIs() const
 	{
 		return m_supportedFeatureURIs;
@@ -140,6 +141,9 @@ private:
 	// feature data that are common for all Lv2Proc
 	UridMap m_uridMap;
 
+	// URID cache for fast URID access
+	Lv2UridCache m_uridCache;
+
 	// functions
 	bool isSubclassOf(const LilvPluginClass *clvss, const char *uriStr);
 };

include/Lv2UridCache.h

@@ -0,0 +1,52 @@
+/*
+ * Lv2UridCache.h - Lv2UridCache definition
+ *
+ * Copyright (c) 2020-2020 Johannes Lorenz <jlsf2013$users.sourceforge.net, $=@>
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * 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 (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LV2URIDCACHE_H
+#define LV2URIDCACHE_H
+
+#include "lmmsconfig.h"
+
+#ifdef LMMS_HAVE_LV2
+
+#include <cstdint>
+
+//! Cached URIDs for fast access (for use in real-time code)
+class Lv2UridCache
+{
+public:
+	enum class Id //!< ID for m_uridCache array
+	{
+		midi_MidiEvent, //!< just an example, unused yet
+		size
+	};
+	//! Return URID for a cache ID
+	uint32_t operator[](Id id) const;
+
+	Lv2UridCache(class UridMap& mapper);
+private:
+	uint32_t m_cache[static_cast<int>(Id::size)];
+};
+
+#endif // LMMS_HAVE_LV2
+#endif // LV2URIDCACHE_H