Add tests to avoid null pointer errors

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11703 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_Copy_Surface.cxx

@@ -31,26 +31,41 @@ Fl_Copy_Surface_Driver *Fl_Copy_Surface_Driver::newCopySurfaceDriver(int w, int
 /** the constructor */
 Fl_Copy_Surface::Fl_Copy_Surface(int w, int h) : Fl_Widget_Surface(NULL) {
   platform_surface = Fl_Copy_Surface_Driver::newCopySurfaceDriver(w, h);
-  driver(platform_surface->driver());
+  if (platform_surface) driver(platform_surface->driver());
 }
 
 Fl_Copy_Surface::~Fl_Copy_Surface() { delete platform_surface; }
 
 void Fl_Copy_Surface::origin(int x, int y) {platform_surface->origin(x, y);}
 
-void Fl_Copy_Surface::origin(int *x, int *y) {platform_surface->origin(x, y);}
+void Fl_Copy_Surface::origin(int *x, int *y) {
+  if (platform_surface) platform_surface->origin(x, y);
+}
 
-void Fl_Copy_Surface::set_current() {platform_surface->set_current();}
+void Fl_Copy_Surface::set_current() {
+  if (platform_surface) platform_surface->set_current();
+}
 
-void Fl_Copy_Surface::translate(int x, int y) {platform_surface->translate(x, y);}
+void Fl_Copy_Surface::translate(int x, int y) {
+  if (platform_surface) platform_surface->translate(x, y);
+}
 
-void Fl_Copy_Surface::untranslate() {platform_surface->untranslate();}
+void Fl_Copy_Surface::untranslate() {
+  if (platform_surface) platform_surface->untranslate();
+}
 
-int Fl_Copy_Surface::w() {return platform_surface->width;}
+int Fl_Copy_Surface::w() {return platform_surface ? platform_surface->width : 0;}
 
-int Fl_Copy_Surface::h() {return platform_surface->height;}
+int Fl_Copy_Surface::h() {return platform_surface ? platform_surface->height : 0;}
 
-int Fl_Copy_Surface::printable_rect(int *w, int *h)  {return platform_surface->printable_rect(w, h);}
+int Fl_Copy_Surface::printable_rect(int *w, int *h)  {
+  if (platform_surface)
+    return platform_surface->printable_rect(w, h);
+  else {
+    *w  = *h = 0;
+  }
+  return 1;
+}
 
 //
 // End of "$Id$".

src/Fl_Image_Surface.cxx

@@ -38,7 +38,7 @@ Fl_Image_Surface_Driver *Fl_Image_Surface_Driver::newImageSurfaceDriver(int w, i
  */
 Fl_Image_Surface::Fl_Image_Surface(int w, int h, int high_res, Fl_Offscreen pixmap) : Fl_Widget_Surface(NULL) {
   platform_surface = Fl_Image_Surface_Driver::newImageSurfaceDriver(w, h, high_res, pixmap);
-  driver(platform_surface->driver());
+  if (platform_surface) driver(platform_surface->driver());
 }
 
 
@@ -47,16 +47,24 @@ Fl_Image_Surface::~Fl_Image_Surface() { delete platform_surface; }
 
 void Fl_Image_Surface::origin(int x, int y) {platform_surface->origin(x, y);}
 
-void Fl_Image_Surface::origin(int *x, int *y) {platform_surface->origin(x, y);}
+void Fl_Image_Surface::origin(int *x, int *y) {
+  if (platform_surface) platform_surface->origin(x, y);
+}
 
-void Fl_Image_Surface::set_current() {platform_surface->set_current();}
+void Fl_Image_Surface::set_current() {
+  if (platform_surface) platform_surface->set_current();
+}
 
 /** Stop sending graphics commands to the surface */
 void Fl_Image_Surface::end_current() {platform_surface->end_current();}
 
-void Fl_Image_Surface::translate(int x, int y) {platform_surface->translate(x, y);}
+void Fl_Image_Surface::translate(int x, int y) {
+  if (platform_surface) platform_surface->translate(x, y);
+}
 
-void Fl_Image_Surface::untranslate() {platform_surface->untranslate();}
+void Fl_Image_Surface::untranslate() {
+  if (platform_surface) platform_surface->untranslate();
+}
 
 /** Returns the Fl_Offscreen object associated to the image surface */
 Fl_Offscreen Fl_Image_Surface::offscreen() {return platform_surface->offscreen;}
@@ -78,6 +86,7 @@ Fl_RGB_Image *Fl_Image_Surface::image() {return platform_surface->image();}
  */
 Fl_Shared_Image* Fl_Image_Surface::highres_image()
 {
+  if (!platform_surface) return NULL;
   Fl_Shared_Image *s_img = Fl_Shared_Image::get(platform_surface->image());
   int width, height;
   platform_surface->printable_rect(&width, &height);

src/Fl_Native_File_Chooser.cxx

@@ -72,7 +72,7 @@ int Fl_Native_File_Chooser::type() const
  */
 void Fl_Native_File_Chooser::options(int o)
 {
-  platform_fnfc->options(o);
+  if (platform_fnfc) platform_fnfc->options(o);
 }
 
 /**

src/Fl_Printer.cxx

@@ -22,6 +22,7 @@
 
 #ifdef FL_PORTING
 #  pragma message "FL_PORTING: implement print support for your platform, or define NO_PRINT_SUPPORT"
+#define NO_PRINT_SUPPORT 1
 #endif
 
 #if defined(NO_PRINT_SUPPORT)

test/device.cxx

@@ -574,12 +574,14 @@ void copy(Fl_Widget *, void *data) {
     Fl_Image *img = rgb_surf->highres_image();
     delete rgb_surf;
     Fl_Display_Device::display_device()->set_current();
-    Fl_Window* g2 = new Fl_Window(img->w()+10, img->h()+10);
-    g2->color(FL_YELLOW);
-    Fl_Box *b = new Fl_Box(FL_NO_BOX,5,5,img->w(), img->h(),0);
-    b->image(img);
-    g2->end();
-    g2->show();
+    if (img) {
+      Fl_Window* g2 = new Fl_Window(img->w()+10, img->h()+10);
+      g2->color(FL_YELLOW);
+      Fl_Box *b = new Fl_Box(FL_NO_BOX,5,5,img->w(), img->h(),0);
+      b->image(img);
+      g2->end();
+      g2->show();
+    }
     return;
   }