Do not send updated state to LV2 UI when unnecessary

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/DistrhoPluginLV2.cpp

@@ -570,7 +570,11 @@ public:
                 if (std::strcmp((const char*)data, "__dpf_ui_data__") == 0)
                 {
                     for (uint32_t i=0, count=fPlugin.getStateCount(); i < count; ++i)
+                    {
+                        if (fPlugin.getStateHints(i) & kStateIsOnlyForDSP)
+                            continue;
                         fNeededUiSends[i] = true;
+                    }
                 }
                 // no, send to DSP as usual
                 else if (fWorker != nullptr)
@@ -930,10 +934,14 @@ public:
                 if (curKey != key)
                     continue;
 
-                const String& value(cit->second);
-
                 const uint32_t hints = fPlugin.getStateHints(i);
 
+               #if ! DISTRHO_PLUGIN_HAS_UI && ! DISTRHO_PLUGIN_WANT_DIRECT_ACCESS
+                // do not save UI-only messages if there is no UI available
+                if ((hints & kStateIsOnlyForUI) == 0x0)
+                    continue;
+               #endif
+
                 if (hints & kStateIsHostReadable)
                 {
                     lv2key = DISTRHO_PLUGIN_URI "#";
@@ -949,6 +957,8 @@ public:
 
                 lv2key += key;
 
+                const String& value(cit->second);
+
                 // some hosts need +1 for the null terminator, even though the type is string
                 store(handle,
                       fUridMap->map(fUridMap->handle, lv2key.buffer()),
@@ -1011,7 +1021,8 @@ public:
 
 #if DISTRHO_PLUGIN_WANT_STATE
             // signal msg needed for UI
-            fNeededUiSends[i] = true;
+            if ((hints & kStateIsOnlyForDSP) == 0x0)
+                fNeededUiSends[i] = true;
 #endif
         }
 
@@ -1061,7 +1072,8 @@ public:
             {
                 if (fPlugin.getStateKey(i) == key)
                 {
-                    fNeededUiSends[i] = true;
+                    if ((fPlugin.getStateHints(i) & kStateIsOnlyForDSP) == 0x0)
+                        fNeededUiSends[i] = true;
                     break;
                 }
             }
@@ -1293,7 +1305,8 @@ private:
                     {
                         if (fPlugin.getStateKey(i) == key)
                         {
-                            fNeededUiSends[i] = true;
+                            if ((fPlugin.getStateHints(i) & kStateIsOnlyForDSP) == 0x0)
+                                fNeededUiSends[i] = true;
                             break;
                         }
                     }

distrho/src/DistrhoUILV2.cpp

@@ -181,6 +181,33 @@ public:
 
                 fUI.stateChanged(key, value);
             }
+            else if (atom->type == fURIDs.atomObject)
+            {
+                /* TODO
+                const LV2_Atom_Object* const obj = (const LV2_Atom_Object*)LV2_ATOM_BODY_CONST(atom);
+
+                const LV2_Atom* property = nullptr;
+                const LV2_Atom* avalue = nullptr;
+                lv2_atom_object_get(obj, fURIDs.patchProperty, &property, fURIDs.patchValue, &avalue, 0);
+
+                DISTRHO_SAFE_ASSERT_RETURN(property != nullptr,);
+                DISTRHO_SAFE_ASSERT_RETURN(avalue != nullptr,);
+
+                DISTRHO_SAFE_ASSERT_RETURN(property->type == fURIDs.atomURID,);
+                DISTRHO_SAFE_ASSERT_RETURN(avalue->type == fURIDs.atomPath || avalue->type == fURIDs.atomString,);
+
+                if (property != nullptr && property->type == fURIDs.atomURID &&
+                    avalue != nullptr && (avalue->type == fURIDs.atomPath || avalue->type == fURIDs.atomString))
+                {
+                    const char* const key   = (const char*)LV2_ATOM_BODY_CONST(property);
+                    const char* const value = (const char*)LV2_ATOM_BODY_CONST(avalue);
+
+                    d_stdout("received atom object '%s' '%s'", key, value);
+
+                    fUI.stateChanged(key, value);
+                }
+                */
+            }
             else
             {
                 d_stdout("received atom not dpfKeyValue");
@@ -368,15 +395,19 @@ private:
     // LV2 URIDs
     const struct URIDs {
         const LV2_URID_Map* _uridMap;
-        LV2_URID dpfKeyValue;
-        LV2_URID atomEventTransfer;
-        LV2_URID atomFloat;
-        LV2_URID atomLong;
-        LV2_URID atomPath;
-        LV2_URID atomString;
-        LV2_URID midiEvent;
-        LV2_URID paramSampleRate;
-        LV2_URID patchSet;
+        const LV2_URID dpfKeyValue;
+        const LV2_URID atomEventTransfer;
+        const LV2_URID atomFloat;
+        const LV2_URID atomLong;
+        const LV2_URID atomObject;
+        const LV2_URID atomPath;
+        const LV2_URID atomString;
+        const LV2_URID atomURID;
+        const LV2_URID midiEvent;
+        const LV2_URID paramSampleRate;
+        const LV2_URID patchProperty;
+        const LV2_URID patchSet;
+        const LV2_URID patchValue;
 
         URIDs(const LV2_URID_Map* const uridMap)
             : _uridMap(uridMap),
@@ -384,11 +415,15 @@ private:
               atomEventTransfer(map(LV2_ATOM__eventTransfer)),
               atomFloat(map(LV2_ATOM__Float)),
               atomLong(map(LV2_ATOM__Long)),
+              atomObject(map(LV2_ATOM__Object)),
               atomPath(map(LV2_ATOM__Path)),
               atomString(map(LV2_ATOM__String)),
+              atomURID(map(LV2_ATOM__URID)),
               midiEvent(map(LV2_MIDI__MidiEvent)),
               paramSampleRate(map(LV2_PARAMETERS__sampleRate)),
-              patchSet(map(LV2_PATCH__Set)) {}
+              patchProperty(map(LV2_PATCH__property)),
+              patchSet(map(LV2_PATCH__Set)),
+              patchValue(map(LV2_PATCH__value)) {}
 
         inline LV2_URID map(const char* const uri) const
         {