Disable screensaver while projecting (untested on Windows)

lib/Slic3r/GUI/Projector.pm

@@ -595,6 +595,8 @@ sub current_layer_height {
 sub start_print {
     my ($self) = @_;
     
+    Slic3r::GUI::disable_screensaver();
+    
     {
         $self->sender(Slic3r::GCode::Sender->new);
         my $res = $self->sender->connect(
@@ -632,15 +634,25 @@ sub stop_print {
     my ($self) = @_;
     
     $self->is_printing(0);
+    Slic3r::GUI::enable_screensaver();
     $self->timer->Stop;
     $self->_timer_cb(undef);
     $self->screen->project_layers(undef);
+}
+
+sub print_completed {
+    my ($self) = @_;
     
     # send custom end G-code
     if ($self->sender) {
         $self->sender->send($_, 1) for grep !/^;/, split /\n/, $self->config->end_gcode;
         $self->sender->disconnect;
     }
+    
+    $self->on_print_completed->()
+        if $self->is_printing && $self->on_print_completed;
+    
+    $self->stop_print;
 }
 
 sub is_projecting {
@@ -667,8 +679,7 @@ sub project_next_layer {
     $self->_layer_num($self->_layer_num + 1);
     Slic3r::debugf "projecting layer %d\n", $self->_layer_num;
     if ($self->_layer_num >= $self->layer_count) {
-        $self->on_print_completed->()
-            if $self->is_printing && $self->on_print_completed;
+        $self->print_completed;
         return;
     }
     

xs/Build.PL

@@ -12,6 +12,10 @@ use Module::Build::WithXSpp;
 # NOGDI            : prevents inclusion of wingdi.h which defines functions Polygon() and Polyline() in global namespace
 # BOOST_ASIO_DISABLE_KQUEUE : prevents a Boost ASIO bug on OS X: https://svn.boost.org/trac/boost/ticket/5339
 my @cflags = qw(-D_GLIBCXX_USE_C99 -DHAS_BOOL -DNOGDI -DSLIC3RXS -DBOOST_ASIO_DISABLE_KQUEUE);
+my @ldflags = ();
+if ($^O eq 'darwin') {
+    push @ldflags, qw(-framework IOKit -framework CoreFoundation);
+}
 
 my @INC  = qw();
 my @LIBS = qw();
@@ -117,7 +121,7 @@ my $build = Module::Build::WithXSpp->new(
         Module::Build::WithXSpp     0.13
     )},
     extra_compiler_flags => [ @INC, @cflags ],
-    extra_linker_flags => \@LIBS,
+    extra_linker_flags => [ @LIBS, @ldflags ],
     
     # Provides extra C typemaps that are auto-merged
     extra_typemap_modules => {

xs/MANIFEST

@@ -38,6 +38,8 @@ src/libslic3r/GCodeWriter.cpp
 src/libslic3r/GCodeWriter.hpp
 src/libslic3r/Geometry.cpp
 src/libslic3r/Geometry.hpp
+src/libslic3r/GUI/GUI.cpp
+src/libslic3r/GUI/GUI.hpp
 src/libslic3r/GUI/3DScene.cpp
 src/libslic3r/GUI/3DScene.hpp
 src/libslic3r/Layer.cpp
@@ -132,6 +134,7 @@ xsp/GCodeSender.xsp
 xsp/GCode.xsp
 xsp/GCodeWriter.xsp
 xsp/Geometry.xsp
+xsp/GUI.xsp
 xsp/GUI_3DScene.xsp
 xsp/Layer.xsp
 xsp/Line.xsp

xs/src/libslic3r/GUI/GUI.cpp

@@ -0,0 +1,37 @@
+#include "GUI.hpp"
+
+#if __APPLE__
+#import <IOKit/pwr_mgt/IOPMLib.h>
+#elif _WIN32
+#include <Windows.h>
+#pragma comment(lib, "user32.lib")
+#endif
+
+namespace Slic3r { namespace GUI {
+
+IOPMAssertionID assertionID;
+
+void
+disable_screensaver()
+{
+    #if __APPLE__
+    CFStringRef reasonForActivity = CFSTR("Slic3r");
+    IOReturn success = IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep, 
+        kIOPMAssertionLevelOn, reasonForActivity, &assertionID); 
+    // ignore result: success == kIOReturnSuccess
+    #elif _WIN32
+    SetThreadExecutionState(EXECUTION_STATE.ES_DISPLAY_REQUIRED | EXECUTION_STATE.ES_CONTINUOUS);
+    #endif
+}
+
+void
+enable_screensaver()
+{
+    #if __APPLE__
+    IOReturn success = IOPMAssertionRelease(assertionID);
+    #elif _WIN32
+    SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS);
+    #endif
+}
+
+} }

xs/src/libslic3r/GUI/GUI.hpp

@@ -0,0 +1,11 @@
+#ifndef slic3r_GUI_hpp_
+#define slic3r_GUI_hpp_
+
+namespace Slic3r { namespace GUI {
+
+void disable_screensaver();
+void enable_screensaver();
+
+} }
+
+#endif

xs/xsp/GUI.xsp

@@ -0,0 +1,15 @@
+%module{Slic3r::XS};
+
+%{
+#include <myinit.h>
+#include "libslic3r/GUI/GUI.hpp"
+%}
+
+
+%package{Slic3r::GUI};
+
+void disable_screensaver()
+    %code{% Slic3r::GUI::disable_screensaver(); %};
+
+void enable_screensaver()
+    %code{% Slic3r::GUI::enable_screensaver(); %};