From 0eef561e7b9bf54b764e7e7254b98530aac5384f Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Fri, 1 Mar 2024 11:11:15 +0100
Subject: Windows: make Ctrl/+/-/0/ scaling system-wide if all screens have
 same DPI

---
 src/Fl.cxx | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/Fl.cxx')

diff --git a/src/Fl.cxx b/src/Fl.cxx
index c9a2972d2..dcf4be3bc 100644
--- a/src/Fl.cxx
+++ b/src/Fl.cxx
@@ -2266,8 +2266,13 @@ float Fl::screen_scale(int n) {
  Also sets the scale factor value of all windows mapped to screen number \p n, if any.
  */
 void Fl::screen_scale(int n, float factor) {
-  if (!Fl::screen_scaling_supported() || n < 0 || n >= Fl::screen_count()) return;
-  Fl::screen_driver()->rescale_all_windows_from_screen(n, factor);
+  Fl_Screen_Driver::APP_SCALING_CAPABILITY capability = Fl::screen_driver()->rescalable();
+  if (!capability || n < 0 || n >= Fl::screen_count()) return;
+  if (capability == Fl_Screen_Driver::SYSTEMWIDE_APP_SCALING) {
+    for (int s = 0; s < Fl::screen_count(); s++) {
+      Fl::screen_driver()->rescale_all_windows_from_screen(s, factor);
+    }
+  } else Fl::screen_driver()->rescale_all_windows_from_screen(n, factor);
 }
 
 /**
-- 
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