add hotkey for toggling interpolation (ctrl+i)

docs/index.html

@@ -1554,6 +1554,12 @@
       <td>Control + p</td>
     </tr>
 
+    <tr>
+      <td>Toggle display interpolation</td>
+      <td>Control + i</td>
+      <td>Control + i</td>
+    </tr>
+
     <tr>
       <td>Toggle sound on/off</td>
       <td>Control + ]</td>

src/common/PKeyboardHandler.cxx

@@ -457,6 +457,7 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultCommo
   {Event::ScanlinesIncrease,        KBDK_0, MOD3},
   {Event::ToggleColorLoss,          KBDK_L, KBDM_CTRL},
   {Event::TogglePalette,            KBDK_P, KBDM_CTRL},
+  {Event::ToggleInter,              KBDK_I, KBDM_CTRL},
   {Event::ToggleJitter,             KBDK_J, MOD3},
   {Event::ToggleFrameStats,         KBDK_L, MOD3},
   {Event::ToggleTimeMachine,        KBDK_T, MOD3},

src/emucore/Console.cxx

@@ -550,6 +550,21 @@ void Console::setPalette(const string& type)
     myTIA->enableFixedColors(true);
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Console::toggleInter()
+{
+  bool enabled = myOSystem.settings().getBool("tia.inter");
+
+  myOSystem.settings().setValue("tia.inter", !enabled);
+
+  // ... and apply potential setting changes to the TIA surface
+  myOSystem.frameBuffer().tiaSurface().updateSurfaceSettings();
+  ostringstream ss;
+
+  ss << "Interpolation " << (!enabled ? "enabled" : "disabled");
+  myOSystem.frameBuffer().showMessage(ss.str());
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Console::togglePhosphor()
 {

src/emucore/Console.hxx

@@ -215,6 +215,12 @@ class Console : public Serializable, public ConsoleIO
     */
     void setPalette(const string& palette);
 
+    /**
+      Toggle interpolation on/off
+    */
+    void toggleInter();
+
+
     /**
       Toggles phosphor effect.
     */

src/emucore/Event.hxx

@@ -120,6 +120,8 @@ class Event
       CompuMateQuote, CompuMateBackspace, CompuMateEquals, CompuMatePlus,
       CompuMateSlash,
 
+      ToggleInter,
+
       LastType
     };
 

src/emucore/EventHandler.cxx

@@ -527,6 +527,10 @@ void EventHandler::handleEvent(Event::Type event, Int32 value, bool repeated)
       if (pressed && !repeated) myOSystem.console().togglePalette();
       return;
 
+    case Event::ToggleInter:
+      if (pressed && !repeated) myOSystem.console().toggleInter();
+      return;
+
     case Event::ToggleJitter:
       if (pressed && !repeated) myOSystem.console().toggleJitter();
       return;
@@ -1835,6 +1839,7 @@ EventHandler::EmulActionList EventHandler::ourEmulActionList = { {
   { Event::FormatDecrease,          "Decrease display format",               "" },
   { Event::FormatIncrease,          "Increase display format",               "" },
   { Event::TogglePalette,           "Switch palette (Standard/Z26/User)",    "" },
+  { Event::ToggleInter,             "Toggle display interpolation",          "" },
 
   // TV effects:
   { Event::VidmodeStd,              "Disable TV effects",                    "" },
@@ -1961,7 +1966,7 @@ const Event::EventSet EventHandler::AudioVideoEvents = {
   Event::FormatDecrease, Event::FormatIncrease,
   Event::VCenterDecrease, Event::VCenterIncrease,
   Event::OverscanDecrease, Event::OverscanIncrease,
-  Event::TogglePalette,
+  Event::TogglePalette, Event::ToggleInter
 };
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/emucore/EventHandler.hxx

@@ -464,7 +464,7 @@ class EventHandler
     #else
       PNG_SIZE             = 0,
     #endif
-      EMUL_ACTIONLIST_SIZE = 140 + PNG_SIZE + COMBO_SIZE,
+      EMUL_ACTIONLIST_SIZE = 141 + PNG_SIZE + COMBO_SIZE,
       MENU_ACTIONLIST_SIZE = 18
     ;