Sprinkle some const qualifiers on SPFilter methods.

2 files changed, 6 insertions, 6 deletions

diff --git a/src/object/sp-filter.cpp b/src/object/sp-filter.cpp
index 223c4f037..8bcb522a4 100644
--- a/src/object/sp-filter.cpp
+++ b/src/object/sp-filter.cpp
@@ -408,7 +408,7 @@ void SPFilter::build_renderer(Inkscape::Filters::Filter *nr_filter)
     }
 }
 
-int SPFilter::primitive_count() {
+int SPFilter::primitive_count() const {
     int count = 0;
 
     for(auto& primitive_obj: this->children) {
@@ -420,7 +420,7 @@ int SPFilter::primitive_count() {
     return count;
 }
 
-int SPFilter::get_image_name(gchar const *name) {
+int SPFilter::get_image_name(gchar const *name) const {
     gchar *name_copy = strdup(name);
     map<gchar *, int, ltstr>::iterator result = this->_image_name->find(name_copy);
     free(name_copy);
@@ -480,7 +480,7 @@ gchar const *SPFilter::name_for_image(int const image) const {
     return nullptr;
 }
 
-Glib::ustring SPFilter::get_new_result_name() {
+Glib::ustring SPFilter::get_new_result_name() const {
     int largest = 0;
 
     for(auto& primitive_obj: this->children) {
diff --git a/src/object/sp-filter.h b/src/object/sp-filter.h
index c06d7e3b2..b90fbeafd 100644
--- a/src/object/sp-filter.h
+++ b/src/object/sp-filter.h
@@ -49,10 +49,10 @@ public:
     void build_renderer(Inkscape::Filters::Filter *nr_filter);
 
     /// Returns the number of filter primitives in this SPFilter object.
-    int primitive_count();
+    int primitive_count() const;
 
     /// Returns a slot number for given image name, or -1 for unknown name.
-    int get_image_name(char const *name);
+    int get_image_name(char const *name) const;
 
     /// Returns slot number for given image name, even if it's unknown.
     int set_image_name(char const *name);
@@ -62,7 +62,7 @@ public:
     char const *name_for_image(int const image) const;
 
     /// Returns a result image name that is not in use inside this filter.
-    Glib::ustring get_new_result_name();
+    Glib::ustring get_new_result_name() const;
 
     SPFilterUnits filterUnits;
     unsigned int filterUnits_set : 1;