Remove "passing NULL to non-pointer argument" warning.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11249 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 3 insertions, 3 deletions

diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx
index eaa5cc975..f072187e7 100644
--- a/src/Fl_Image_Surface.cxx
+++ b/src/Fl_Image_Surface.cxx
@@ -47,7 +47,7 @@
  \version 1.3.4 (1.3.3 without the highres parameter)
  */
 Fl_Image_Surface::Fl_Image_Surface(int w, int h, int high_res) : Fl_Widget_Surface(NULL) {
-  initialize_(NULL, w, h, high_res);
+  initialize_((Fl_Offscreen)0, w, h, high_res);
 }
 
 void Fl_Image_Surface::initialize_(Fl_Offscreen pixmap, int w, int h, int high_res) {
@@ -255,7 +255,7 @@ static int find_slot() { // return an available slot to memorize an Fl_Image_Sur
    */
 Fl_Offscreen fl_create_offscreen(int w, int h) {
   int rank = find_slot();
-  if (rank < 0) return NULL;
+  if (rank < 0) return (Fl_Offscreen)0;
   offscreen_api_surface[rank] = new Fl_Image_Surface(w, h);
   return offscreen_api_surface[rank]->offscreen;
 }
@@ -263,7 +263,7 @@ Fl_Offscreen fl_create_offscreen(int w, int h) {
 #if USE_X11
 Fl_Offscreen fl_create_offscreen_with_alpha(int w, int h) {
   int rank = find_slot();
-  if (rank < 0) return NULL;
+  if (rank < 0) return (Fl_Offscreen)0;
   Fl_Offscreen pixmap = XCreatePixmap(fl_display, RootWindow(fl_display, fl_screen), w, h, 32);
   offscreen_api_surface[rank] = new Fl_Image_Surface(pixmap, w, h);
   return pixmap;