Perform additional checks before merging solid surfaces (i.e. take flow and fill pattern into account)

lib/Slic3r/Fill.pm

@@ -64,8 +64,54 @@ sub make_fill {
     {
         my @surfaces_with_bridge_angle = grep defined $_->bridge_angle, @{$layerm->fill_surfaces};
         
+        # group surfaces by distinct properties
+        my @groups = @{$layerm->fill_surfaces->group};
+        
+        # merge compatible groups (we can generate continuous infill for them)
+        {
+            # cache flow widths and patterns used for all solid groups
+            # (we'll use them for comparing compatible groups)
+            my @is_solid = my @fw = my @pattern = ();
+            for (my $i = 0; $i <= $#groups; $i++) {
+                # we can only merge solid non-bridge surfaces, so discard
+                # non-solid surfaces
+                if ($groups[$i][0]->is_solid && (!$groups[$i][0]->is_bridge || $layerm->id == 0)) {
+                    $is_solid[$i] = 1;
+                    $fw[$i] = ($groups[$i][0]->surface_type == S_TYPE_TOP)
+                        ? $layerm->flow(FLOW_ROLE_TOP_SOLID_INFILL)->width
+                        : $solid_infill_flow->width;
+                    $pattern[$i] = $groups[$i][0]->is_external
+                        ? $layerm->config->solid_fill_pattern
+                        : 'rectilinear';
+                } else {
+                    $is_solid[$i]   = 0;
+                    $fw[$i]         = 0;
+                    $pattern[$i]    = 'none';
+                }
+            }
+            
+            # loop through solid groups
+            for (my $i = 0; $i <= $#groups; $i++) {
+                next if !$is_solid[$i];
+                
+                # find compatible groups and append them to this one
+                for (my $j = $i+1; $j <= $#groups; $j++) {
+                    next if !$is_solid[$j];
+                
+                    if ($fw[$i] == $fw[$j] && $pattern[$i] eq $pattern[$j]) {
+                        # groups are compatible, merge them
+                        push @{$groups[$i]}, @{$groups[$j]};
+                        splice @groups,     $j, 1;
+                        splice @is_solid,   $j, 1;
+                        splice @fw,         $j, 1;
+                        splice @pattern,    $j, 1;
+                    }
+                }
+            }
+        }
+        
         # give priority to bridges
-        my @groups = sort { defined $a->[0]->bridge_angle ? -1 : 0 } @{$layerm->fill_surfaces->group(1)};
+        @groups = sort { defined $a->[0]->bridge_angle ? -1 : 0 } @groups;
         
         foreach my $group (@groups) {
             my $union_p = union([ map $_->p, @$group ], 1);

xs/src/Surface.cpp

@@ -16,6 +16,13 @@ Surface::is_solid() const
         || this->surface_type == stInternalSolid;
 }
 
+bool
+Surface::is_external() const
+{
+    return this->surface_type == stTop
+        || this->surface_type == stBottom;
+}
+
 bool
 Surface::is_bridge() const
 {

xs/src/Surface.hpp

@@ -18,6 +18,7 @@ class Surface
     unsigned short  extra_perimeters;
     double area() const;
     bool is_solid() const;
+    bool is_external() const;
     bool is_bridge() const;
     
     #ifdef SLIC3RXS

xs/src/SurfaceCollection.cpp

@@ -21,14 +21,14 @@ SurfaceCollection::simplify(double tolerance)
 
 /* group surfaces by common properties */
 void
-SurfaceCollection::group(std::vector<SurfacesPtr> *retval, bool merge_solid)
+SurfaceCollection::group(std::vector<SurfacesPtr> *retval)
 {
     for (Surfaces::iterator it = this->surfaces.begin(); it != this->surfaces.end(); ++it) {
         // find a group with the same properties
         SurfacesPtr* group = NULL;
         for (std::vector<SurfacesPtr>::iterator git = retval->begin(); git != retval->end(); ++git) {
             Surface* gkey = git->front();
-            if ((gkey->surface_type == it->surface_type || (merge_solid && gkey->is_solid() && it->is_solid()))
+            if (   gkey->surface_type      == it->surface_type
                 && gkey->thickness         == it->thickness
                 && gkey->thickness_layers  == it->thickness_layers
                 && gkey->bridge_angle      == it->bridge_angle) {

xs/src/SurfaceCollection.hpp

@@ -11,7 +11,7 @@ class SurfaceCollection
     public:
     Surfaces surfaces;
     void simplify(double tolerance);
-    void group(std::vector<SurfacesPtr> *retval, bool merge_solid = false);
+    void group(std::vector<SurfacesPtr> *retval);
 };
 
 }

xs/t/05_surface.t

@@ -4,7 +4,7 @@ use strict;
 use warnings;
 
 use Slic3r::XS;
-use Test::More tests => 16;
+use Test::More tests => 15;
 
 my $square = [  # ccw
     [100, 100],
@@ -71,7 +71,6 @@ is $surface->extra_perimeters, 2, 'extra_perimeters';
     );
     my $collection = Slic3r::Surface::Collection->new(@surfaces);
     is scalar(@{$collection->group}), 2, 'group() returns correct number of groups';
-    is scalar(@{$collection->group(1)}), 1, 'group() returns correct number of solid groups';
 }
 
 __END__

xs/xsp/Surface.xsp

@@ -16,6 +16,7 @@
         %code{% RETVAL = THIS->thickness_layers; %};
     double area();
     bool is_solid() const;
+    bool is_external() const;
     bool is_bridge() const;
 %{
 

xs/xsp/SurfaceCollection.xsp

@@ -76,12 +76,11 @@ SurfaceCollection::set_surface_type(index, surface_type)
         THIS->surfaces[index].surface_type = surface_type;
 
 SV*
-SurfaceCollection::group(merge_solid = false)
-    bool    merge_solid
+SurfaceCollection::group()
     CODE:
         // perform grouping
         std::vector<SurfacesPtr> groups;
-        THIS->group(&groups, merge_solid);
+        THIS->group(&groups);
         
         // build return arrayref
         AV* av = newAV();