Slicing in C++ with progress indication.

xs/xsp/AppController.xsp

@@ -7,14 +7,20 @@
 #include "libslic3r/Print.hpp"
 %}
 
+%name{Slic3r::PrintController} class PrintController {
+
+    PrintController(Print *print);
+
+    void slice_to_png(); 
+    void slice();
+};
+
 %name{Slic3r::AppController} class AppController {
 
     AppController();
 
-    void slice_to_png(); 
-
+    PrintController *print_ctl();
     void set_model(Model *model);
     void set_print(Print *print);
     void set_global_progress_indicator_id(unsigned gauge_id, unsigned statusbar_id);
-
 };

xs/xsp/my.map

@@ -216,7 +216,8 @@ Ref<PrintObjectSupportMaterial>   O_OBJECT_SLIC3R_T
 Clone<PrintObjectSupportMaterial> O_OBJECT_SLIC3R_T
 
 AppConfig*	                O_OBJECT_SLIC3R
-AppController*                  O_OBJECT_SLIC3R
+AppController*              O_OBJECT_SLIC3R
+PrintController*            O_OBJECT_SLIC3R
 Ref<AppConfig>         		O_OBJECT_SLIC3R_T
 
 GLShader*                  	O_OBJECT_SLIC3R

xs/xsp/typemap.xspt

@@ -268,4 +268,5 @@
     $CVar = (PrintObjectStep)SvUV($PerlVar);
   %};
 };
-%typemap{AppController*};
+%typemap{AppController*};
+%typemap{PrintController*};