Fix theme build for Windows; add trick to make it all work

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

source/frontend/carla_app.py

@@ -42,12 +42,16 @@ class CarlaApplication(object):
 
         # Needed for local wine build
         if WINDOWS and CWD.endswith(("frontend", "resources")) and os.getenv("CXFREEZE") is None:
-            QApplication.addLibraryPath("H:\\builds\\msys2-i686\\mingw32\\share\\qt5\\plugins")
+            if kIs64bit:
+                path = "H:\\builds\\msys2-x86_64\\mingw64\\share\\qt5\\plugins"
+            else:
+                path = "H:\\builds\\msys2-i686\\mingw32\\share\\qt5\\plugins"
+            QApplication.addLibraryPath(path)
 
         # Use binary dir as library path
         if os.path.exists(pathBinaries):
             QApplication.addLibraryPath(pathBinaries)
-            stylesDir = pathBinaries if not WINDOWS else "" # FIXME
+            stylesDir = pathBinaries
 
         # If style is not available we can still fake it
         else:
@@ -72,6 +76,13 @@ class CarlaApplication(object):
 
         self.fApp.setStyle("carla" if stylesDir else "fusion")
 
+        if WINDOWS:
+            carlastyle = os.path.join(pathBinaries, "styles", "carlastyle.dll")
+            self._stylelib = CDLL(carlastyle, RTLD_GLOBAL)
+            self._stylelib.set_qt_app_style.argtypes = None
+            self._stylelib.set_qt_app_style.restype = None
+            self._stylelib.set_qt_app_style()
+
         # set palette
         proThemeColor = settings.value(CARLA_KEY_MAIN_PRO_THEME_COLOR, CARLA_DEFAULT_MAIN_PRO_THEME_COLOR, type=str).lower()
 

source/theme/CarlaStylePlugin.cpp

@@ -1,7 +1,7 @@
 /*
  * Carla Style, based on Qt5 fusion style
  * Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies)
- * Copyright (C) 2013-2014 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2013-2019 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -18,6 +18,10 @@
 #include "CarlaStylePlugin.hpp"
 #include "CarlaStyle.hpp"
 
+#ifdef CARLA_OS_WIN
+# include <QtWidgets/QApplication>
+#endif
+
 CarlaStylePlugin::CarlaStylePlugin(QObject* parentObj)
     : QStylePlugin(parentObj) {}
 
@@ -34,3 +38,11 @@ QStringList CarlaStylePlugin::keys() const
 
 Q_EXPORT_PLUGIN2(Carla, CarlaStylePlugin)
 #endif
+
+#ifdef CARLA_OS_WIN
+CARLA_EXPORT void set_qt_app_style()
+{
+    qApp->setStyle(new CarlaStyle());
+}
+#endif
+

source/theme/Makefile

@@ -11,7 +11,7 @@ include ../modules/Makefile.mk
 # ---------------------------------------------------------------------------------------------------------------------
 
 ifeq ($(WIN32),true)
-NON_STATIC_LINK_FLAGS = $(shell echo $(LINK_FLAGS) | awk 'sub(" -static","")')
+NON_STATIC_LINK_FLAGS = $(shell echo $(LINK_FLAGS) | awk 'sub(" -static","")') -static-libgcc
 else
 NON_STATIC_LINK_FLAGS = $(LINK_FLAGS)
 endif
@@ -118,7 +118,7 @@ $(MODULEDIR)/$(MODULENAME).qt5.a: $(FILES_qt5) $(OBJS_qt5)
 $(BINDIR)/styles/carlastyle.dll: $(FILES_qt5) $(OBJS_qt5_shared)
 	-@mkdir -p $(BINDIR)/styles
 	@echo "Linking carlastyle.dll"
-	@$(CXX) $(OBJS_qt5_shared) $(QT5_LINK_FLAGS) -luuid -lwinspool -lgdi32 -limm32 -lole32 -lshell32 -lws2_32 -shared -o $@
+	@$(CXX) $(OBJS_qt5_shared) $(QT5_LINK_FLAGS) -shared -o $@
 
 $(BINDIR)/styles/carlastyle.dylib: $(FILES_qt5) $(OBJS_qt5_shared)
 	-@mkdir -p $(BINDIR)/styles