Implement Copy and Paste for FX

There was no way to move an FX from one position (say the first
inline A slot) to another (like the second send). This change puts
"Copy" and "Paste" on the menu so you can move FX around.

Closes surge-synthesizer#309

src/common/gui/CSnapshotMenu.cpp

@@ -235,6 +235,8 @@ j;
 const char fxslot_names[8][NAMECHARS] = {"A Insert 1", "A Insert 2", "B Insert 1", "B Insert 2",
                                          "Send FX 1",  "Send FX 2",  "Master 1",   "Master 2"};
 
+std::vector<float> CFxMenu::fxCopyPaste;
+
 CFxMenu::CFxMenu(const CRect& size,
                  IControlListener* listener,
                  long tag,
@@ -384,3 +386,98 @@ void CFxMenu::saveSnapshot(TiXmlElement* e, const char* name)
       t = TINYXML_SAFE_TO_ELEMENT(t->NextSibling("type"));
    }
 }
+
+void CFxMenu::populate()
+{
+    CSnapshotMenu::populate();
+
+    this->addSeparator();
+
+    auto copyItem = new CCommandMenuItem(CCommandMenuItem::Desc("Copy"));
+    auto copy = [this](CCommandMenuItem* item) {
+        this->copyFX();
+    };
+    copyItem->setActions(copy, nullptr);
+    this->addEntry(copyItem);
+
+    auto pasteItem = new CCommandMenuItem(CCommandMenuItem::Desc("Paste"));
+    auto paste = [this](CCommandMenuItem* item) {
+        this->pasteFX();
+    };
+    pasteItem->setActions(paste, nullptr);
+    this->addEntry(pasteItem);
+}
+
+
+void CFxMenu::copyFX()
+{
+    /*
+    ** This is a junky implementation until I figure out save and load which will require me to stream this
+    */
+    if( fxCopyPaste.size() == 0 )
+    {
+        fxCopyPaste.resize( n_fx_params * 3 + 1 ); // type then (val; ts; extend)
+    }
+
+    fxCopyPaste[0] = fx->type.val.i;
+    for( int i=0; i<n_fx_params; ++i )
+    {
+        int vp = i * 3 + 1;
+        int tp = i * 3 + 2;
+        int xp = i * 3 + 3;
+
+        switch( fx->p[i].valtype )
+        {
+        case vt_float:
+            fxCopyPaste[vp] = fx->p[i].val.f;
+            break;
+        case vt_int:
+            fxCopyPaste[vp] = fx->p[i].val.i;
+            break;
+        }
+
+        fxCopyPaste[tp] = fx->p[i].temposync;
+        fxCopyPaste[xp] = fx->p[i].extend_range;
+    }
+    memcpy(fxbuffer,fx,sizeof(FxStorage));
+
+}
+
+void CFxMenu::pasteFX()
+{
+    if( fxCopyPaste.size() == 0 )
+    {
+        return;
+    }
+
+    fxbuffer->type.val.i = (int)fxCopyPaste[0];
+
+    Effect* t_fx = spawn_effect(fxbuffer->type.val.i, storage, fxbuffer, 0);
+    if (t_fx)
+    {
+        t_fx->init_ctrltypes();
+        t_fx->init_default_values();
+        delete t_fx;
+    }
+
+    for (int i = 0; i < n_fx_params; i++)
+    {
+        int vp = i * 3 + 1;
+        int tp = i * 3 + 2;
+        int xp = i * 3 + 3;
+
+        switch( fxbuffer->p[i].valtype )
+        {
+        case vt_float:
+            fxbuffer->p[i].val.f = fxCopyPaste[vp];
+            break;
+        case vt_int:
+            fxbuffer->p[i].val.i = (int)fxCopyPaste[vp];
+            break;
+        default:
+            break;
+        }
+        fxbuffer->p[i].temposync = (int)fxCopyPaste[tp];
+        fxbuffer->p[i].extend_range = (int)fxCopyPaste[xp];
+    }
+}

src/common/gui/CSnapshotMenu.h

@@ -14,7 +14,7 @@ class CSnapshotMenu : public VSTGUI::COptionMenu
    virtual ~CSnapshotMenu();
    virtual void draw(VSTGUI::CDrawContext* dc);
    // virtual VSTGUI::CMouseEventResult onMouseDown(VSTGUI::CPoint& where, const VSTGUI::CButtonState& buttons);
-   void populate();
+   virtual void populate();
    virtual void loadSnapshot(int type, TiXmlElement* e){};
    virtual void saveSnapshot(TiXmlElement* e, const char* name){};
    virtual bool canSave();
@@ -61,10 +61,15 @@ class CFxMenu : public CSnapshotMenu
    }
    virtual void loadSnapshot(int type, TiXmlElement* e);
    virtual void saveSnapshot(TiXmlElement* e, const char* name);
-
+   virtual void populate() override;
+
 protected:
    FxStorage *fx = nullptr, *fxbuffer = nullptr;
+   static std::vector<float> fxCopyPaste; // OK this is a crap data structure for now. See the code.
    int slot = 0;
 
+   void copyFX();
+   void pasteFX();
+
    CLASS_METHODS(CFxMenu, VSTGUI::CControl)
 };