From 325c4b8666b16bfcb4458047d0d57a81b5456a70 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 30 Jan 2020 18:54:18 +0100
Subject: New public static variable bool Fl_Image::register_images_done Allows
 an app to detect whether fl_register_images() was called or not.

---
 FL/Fl_Image.H          | 1 +
 src/Fl_Image.cxx       | 2 ++
 src/fl_images_core.cxx | 1 +
 3 files changed, 4 insertions(+)

diff --git a/FL/Fl_Image.H b/FL/Fl_Image.H
index 687aa6057..c6fb55967 100644
--- a/FL/Fl_Image.H
+++ b/FL/Fl_Image.H
@@ -226,6 +226,7 @@ public:
   static void scaling_algorithm(Fl_RGB_Scaling algorithm) {scaling_algorithm_ = algorithm; }
   /** Gets what algorithm is used when resizing a source image to draw it. */
   static Fl_RGB_Scaling scaling_algorithm() {return scaling_algorithm_;}
+  static bool register_images_done;
 };
 
 
diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx
index f4bf30b3e..b02d43f75 100644
--- a/src/Fl_Image.cxx
+++ b/src/Fl_Image.cxx
@@ -297,6 +297,8 @@ int Fl_Image::draw_scaled(int X, int Y, int W, int H) {
   return 1;
 }
 
+/** True after fl_register_images() was called, false before */
+bool Fl_Image::register_images_done = false;
 
 //
 // RGB image class...
diff --git a/src/fl_images_core.cxx b/src/fl_images_core.cxx
index 58fcd2e5f..d610fb8c4 100644
--- a/src/fl_images_core.cxx
+++ b/src/fl_images_core.cxx
@@ -57,6 +57,7 @@ static Fl_Image	*fl_check_images(const char *name, uchar *header, int headerlen)
 */
 void fl_register_images() {
   Fl_Shared_Image::add_handler(fl_check_images);
+  Fl_Image::register_images_done = true;
 }
 
 
-- 
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