Add Fl::screen_scale(int) function to get the scaling factor value of a screen.

This allows to keep class Fl_Screen_Driver away from the public API.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12926 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl.H

@@ -1008,6 +1008,7 @@ int main() {
   static void screen_work_area(int &X, int &Y, int &W, int &H, int mx, int my); // via screen driver
   static void screen_work_area(int &X, int &Y, int &W, int &H, int n); // via screen driver
   static void screen_work_area(int &X, int &Y, int &W, int &H); // via screen driver
+  static float screen_scale(int n); // via screen driver
 /**   @} */
 
 

FL/Fl_Window.H

@@ -543,7 +543,7 @@ public:
   void shape(const Fl_Image* img);
   void shape(const Fl_Image& b) ;
   int is_shaped();
-  inline int screen_num();
+  int screen_num();
 };
 
 #endif

documentation/src/drawing.dox

@@ -62,7 +62,7 @@ for the screen in use and obtains quantities in <b>drawing units</b>.
 The current scale factor value, for an Fl_Window named \e window, is given by
 \code
 int nscreen = window->screen_num(); // the screen where window is mapped
-float s = Fl::screen_driver()->scale(nscreen); // this screen's scale factor
+float s = Fl::screen_scale(nscreen); // this screen's scale factor
 \endcode
 One drawing unit generally corresponds to one screen pixel...
 <li>...but not on Mac OS X and for retina displays, where one drawing unit corresponds

src/Fl.cxx

@@ -2110,6 +2110,12 @@ int Fl::get_font_sizes(Fl_Font fnum, int*& sizep) {
   return Fl_Graphics_Driver::default_driver().get_font_sizes(fnum, sizep);
 }
 
+/** Current value of the GUI scaling factor for screen number \p n */
+float Fl::screen_scale(int n) {
+  return Fl::screen_driver()->scale(n);
+}
+
+
 // Pointers you can use to change FLTK to another language.
 // Note: Similar pointers are defined in FL/fl_ask.H and src/fl_ask.cxx
 FL_EXPORT const char* fl_local_shift = Fl::system_driver()->shift_name();

src/Fl_Window.cxx

@@ -632,7 +632,7 @@ void Fl_Window::size_range(int minw, int minh, int maxw, int maxh, int dw, int d
 }
 
 /** The number of the screen containing the mapped window */
-inline int Fl_Window::screen_num() {
+int Fl_Window::screen_num() {
   return pWindowDriver->screen_num();
 }
 

src/drivers/Cocoa/Fl_Cocoa_Printer_Driver.mm

@@ -383,7 +383,7 @@ void Fl_Cocoa_Printer_Driver::draw_decorated_window(Fl_Window *win, int x_offset
       CGContextRef gc = (CGContextRef)driver()->gc();
       CGContextSaveGState(gc);
       CGContextTranslateCTM(gc, x_offset - 0.5, y_offset + bt - 0.5);
-      float s = Fl::screen_driver()->scale(Fl_Window_Driver::driver(win)->screen_num());
+      float s = Fl::screen_scale(win->screen_num());
       CGContextScaleCTM(gc, 1/s, -1/s);
       Fl_Cocoa_Window_Driver::draw_layer_to_context(layer, gc, win->w() * s, bt);
       CGContextRestoreGState(gc);