Set scale factor for carla-bridge-*/carla-single standalone usage

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

source/backend/CarlaStandalone.cpp

@@ -43,18 +43,16 @@
 
 // --------------------------------------------------------------------------------------------------------------------
 
-#ifdef USING_JUCE
 static void carla_standalone_juce_init(void);
 static void carla_standalone_juce_idle(void);
 static void carla_standalone_juce_cleanup(void);
-# define carla_juce_init carla_standalone_juce_init
-# define carla_juce_idle carla_standalone_juce_idle
-# define carla_juce_cleanup carla_standalone_juce_cleanup
-# include "utils/JUCE.cpp"
-# undef carla_juce_init
-# undef carla_juce_idle
-# undef carla_juce_cleanup
-#endif
+#define carla_juce_init carla_standalone_juce_init
+#define carla_juce_idle carla_standalone_juce_idle
+#define carla_juce_cleanup carla_standalone_juce_cleanup
+#include "utils/JUCE.cpp"
+#undef carla_juce_init
+#undef carla_juce_idle
+#undef carla_juce_cleanup
 
 // -------------------------------------------------------------------------------------------------------------------
 // Always return a valid string ptr for standalone functions
@@ -2375,6 +2373,7 @@ const char* carla_get_host_osc_url_udp(CarlaHostHandle handle)
 # include "CarlaProcessUtils.cpp"
 # include "CarlaStateUtils.cpp"
 # include "utils/Information.cpp"
+# include "utils/Windows.cpp"
 #endif /* CARLA_PLUGIN_EXPORT */
 
 // --------------------------------------------------------------------------------------------------------------------

source/backend/CarlaUtils.h

@@ -1,6 +1,6 @@
 /*
  * Carla Plugin Host
- * Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2011-2021 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -304,7 +304,10 @@ CARLA_EXPORT void carla_set_process_name(const char* name);
 /* --------------------------------------------------------------------------------------------------------------------
  * window control */
 
-CARLA_EXPORT double carla_get_desktop_scale_factor();
+/*!
+ * Get the global/desktop scale factor.
+ */
+CARLA_EXPORT double carla_get_desktop_scale_factor(void);
 
 CARLA_EXPORT int carla_cocoa_get_window(void* nsViewPtr);
 CARLA_EXPORT void carla_cocoa_set_transient_window_for(void* nsViewChild, void* nsViewParent);

source/backend/utils/Information.cpp

@@ -1,6 +1,6 @@
 /*
  * Carla Plugin Host
- * Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2011-2021 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -45,6 +45,10 @@
 # pragma GCC diagnostic pop
 #endif
 
+#ifdef CARLA_OS_MAC
+# import <AppKit/AppKit.h>
+#endif
+
 #include "water/files/File.h"
 
 // -------------------------------------------------------------------------------------------------------------------

source/backend/utils/Windows.cpp

@@ -1,6 +1,6 @@
 /*
  * Carla Plugin Host
- * Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2011-2021 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -40,13 +40,15 @@ double carla_get_desktop_scale_factor()
     if (const char* const scale = getenv("QT_SCALE_FACTOR"))
         return std::max(1.0, std::atof(scale));
 
-#if defined(CARLA_OS_MAC) && !defined(CARLA_PLUGIN_EXPORT)
+#ifdef CARLA_OS_MAC
     return [NSScreen mainScreen].backingScaleFactor;
 #endif
 
     return 1.0;
 }
 
+// -------------------------------------------------------------------------------------------------------------------
+
 int carla_cocoa_get_window(void* nsViewPtr)
 {
     CARLA_SAFE_ASSERT_RETURN(nsViewPtr != nullptr, 0);

source/bridges-plugin/CarlaBridgePlugin.cpp

@@ -21,6 +21,7 @@
 
 #include "CarlaEngine.hpp"
 #include "CarlaHost.h"
+#include "CarlaUtils.h"
 
 #include "CarlaBackendUtils.hpp"
 #include "CarlaJuceUtils.hpp"
@@ -657,6 +658,17 @@ int main(int argc, char* argv[])
             return 1;
         }
 
+        if (! useBridge && ! testing)
+        {
+#ifdef HAVE_X11
+            if (std::getenv("DISPLAY") != nullptr)
+#endif
+                carla_set_engine_option(gHostHandle,
+                                        CarlaBackend::ENGINE_OPTION_FRONTEND_UI_SCALE,
+                                        static_cast<int>(carla_get_desktop_scale_factor()*1000+0.5),
+                                        nullptr);
+        }
+
         // -----------------------------------------------------------------
         // Init plugin