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-rw-r--r--FL/Fl_Screen_Driver.H3
1 files changed, 3 insertions, 0 deletions
diff --git a/FL/Fl_Screen_Driver.H b/FL/Fl_Screen_Driver.H
index 7f229e22b..c3b36779b 100644
--- a/FL/Fl_Screen_Driver.H
+++ b/FL/Fl_Screen_Driver.H
@@ -176,6 +176,9 @@ public:
/** Returns the platform's support for rescaling the application with ctrl-/+/-/0/ keys.
*/
virtual APP_SCALING_CAPABILITY rescalable() { return NO_APP_SCALING; }
+ /* Number of pixels per drawing unit for the display.
+ The default implementation may be enough. */
+ virtual float retina_factor() { return 1; }
};