Apply C++11 fixits

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using

1 files changed, 4 insertions, 4 deletions

diff --git a/src/resources/imagewriter.cpp b/src/resources/imagewriter.cpp
index 7257e1b9..ddf1fbee 100644
--- a/src/resources/imagewriter.cpp
+++ b/src/resources/imagewriter.cpp
@@ -39,7 +39,7 @@ bool ImageWriter::writePNG(SDL_Surface *surface, const std::string &filename)
     if (SDL_MUSTLOCK(surface))
         SDL_LockSurface(surface);
 
-    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
     if (!png_ptr)
     {
         logger->log("Had trouble creating png_structp");
@@ -49,14 +49,14 @@ bool ImageWriter::writePNG(SDL_Surface *surface, const std::string &filename)
     info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr)
     {
-        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+        png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
         logger->log("Could not create png_info");
         return false;
     }
 
     if (setjmp(png_jmpbuf(png_ptr)))
     {
-        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+        png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
         logger->log("problem writing to %s", filename.c_str());
         return false;
     }
@@ -100,7 +100,7 @@ bool ImageWriter::writePNG(SDL_Surface *surface, const std::string &filename)
 
     delete [] row_pointers;
 
-    png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+    png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
 
     if (SDL_MUSTLOCK(surface))
         SDL_UnlockSurface(surface);