From 7fe9a56ef835bbf372da885de4f24cf376097d66 Mon Sep 17 00:00:00 2001
From: tamasmeszaros <meszaros.q@gmail.com>
Date: Wed, 23 May 2018 11:02:07 +0200
Subject: [PATCH] Added some comments and sequential version of png slice
 export.

---
 xs/src/libslic3r/Print.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/xs/src/libslic3r/Print.cpp b/xs/src/libslic3r/Print.cpp
index ef38df35e0..c9c1c7c0c6 100644
--- a/xs/src/libslic3r/Print.cpp
+++ b/xs/src/libslic3r/Print.cpp
@@ -1301,8 +1301,10 @@ public:
     void saveLayer(unsigned lyr, const std::string& path);
 };
 
-template<> // Implementation for PNG raster output
-class FilePrinter<Print::FilePrinterFormat::PNG> {
+// Implementation for PNG raster output
+// Be aware that if a large number of layers are allocated, it can wery well
+// exhaust the available memory.
+template<> class FilePrinter<Print::FilePrinterFormat::PNG> {
 
     struct Layer {
         Raster first;
@@ -1498,8 +1500,8 @@ void Print::print_to(std::string dirpath,
         }
 
         printer.finishLayer(layer_id);  // Finish the layer for later saving it.
-        // printer.saveLayer(layer_id, dir); We could save the layer immediately
 
+        // printer.saveLayer(layer_id, dir); We could save the layer immediately
     };
 
     // Print all the layers in parallel
@@ -1507,6 +1509,9 @@ void Print::print_to(std::string dirpath,
                                                        layers.size(),
                                                        process_layer);
 
+    // Sequential version (for testing)
+    // for(unsigned l = 0; l < layers.size(); ++l) process_layer(l);
+
     // Save the print into the file system.
     printer.save(dir);
 }