WIP: add support for cli option to change the window size

src/blupi.cxx

@@ -59,6 +59,7 @@ CDecor *      g_pDecor       = nullptr;
 std::thread * g_updateThread = nullptr;
 
 bool        g_bFullScreen    = false; // false si mode de test
+Uint8       g_windowScale    = 1;
 Sint32      g_speedRate      = 1;
 Sint32      g_timerInterval  = 50; // inverval = 50ms
 int         g_rendererType   = 0;
@@ -71,6 +72,7 @@ enum Settings {
   SETTING_SPEEDRATE     = 1 << 1,
   SETTING_TIMERINTERVAL = 1 << 2,
   SETTING_RENDERER      = 1 << 3,
+  SETTING_ZOOM         = 1 << 4,
 };
 
 static int g_settingsOverload = 0;
@@ -152,6 +154,13 @@ ReadConfig ()
       g_bFullScreen = 1;
   }
 
+  if (!(g_settingsOverload & SETTING_ZOOM) && j.find ("scale") != j.end ())
+  {
+    g_windowScale = j["scale"].get<Uint8> ();
+    if (g_windowScale != 0)
+      g_windowScale = 1;
+  }
+
   if (
     !(g_settingsOverload & SETTING_RENDERER) && j.find ("renderer") != j.end ())
   {
@@ -526,6 +535,10 @@ parseArgs (int argc, char * argv[], bool & exit)
       {"-f", "--fullscreen"},
       "load in fullscreen [on;off] (default: on)",
       1},
+     {"zoom",
+      {"-z", "--zoom"},
+      "change the window scale (only if fullscreen is off) [1;2] (default: 1)",
+      1},
      {"renderer",
       {"-r", "--renderer"},
       "set a renderer [auto;software;accelerated] (default: auto)",
@@ -587,6 +600,12 @@ parseArgs (int argc, char * argv[], bool & exit)
     g_settingsOverload |= SETTING_FULLSCREEN;
   }
 
+  if (args["zoom"])
+  {
+    g_windowScale = args["zoom"];
+    g_settingsOverload |= SETTING_ZOOM;
+  }
+
   if (args["renderer"])
   {
     if (args["renderer"].as<std::string> () == "auto")
@@ -905,6 +924,7 @@ DoInit (int argc, char * argv[], bool & exit)
   g_pEvent->Create (g_pPixmap, g_pDecor, g_pSound, g_pMovie);
   g_updateThread = new std::thread (CheckForUpdates);
   g_pEvent->SetFullScreen (g_bFullScreen);
+  g_pEvent->SetWindowSize (g_windowScale);
   g_pEvent->ChangePhase (EV_PHASE_INTRO1);
 
   g_bTermInit = true;

src/event.cxx

@@ -1667,6 +1667,33 @@ CEvent::SetFullScreen (bool bFullScreen)
   CEvent::PushUserEvent (EV_WARPMOUSE, coord);
 }
 
+/**
+ * \brief Change the size of the window.
+ *
+ * We use an integer scale to be sure that the pixels are always well formed.
+ *
+ * \param[in] newScale - The new scale.
+ */
+void
+CEvent::SetWindowSize (Uint8 newScale)
+{
+  if (newScale == m_WindowScale)
+    return;
+
+  auto scale = m_WindowScale;
+  m_WindowScale = scale;
+  switch (newScale)
+  {
+  case 1:
+  case 2:
+    SetWindowSize (scale, m_WindowScale);
+    break;
+
+  default:
+    return;
+  }
+}
+
 /**
  * \brief Change the size of the window.
  *

src/event.h

@@ -140,6 +140,7 @@ public:
   void IntroStep ();
 
   Uint8 GetWindowScale ();
+  void  SetWindowSize (Uint8 newScale);
   void  SetUpdateVersion (const std::string & version);
 
   static void PushUserEvent (Sint32 code, void * data = nullptr);