From 04ec829bfba341038150beab718c2d090efdb42b Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Fri, 1 Nov 2019 08:26:22 +0100
Subject: Fix fl_overlay_rect() under X11 on HighDPI display.

The mandelbrot demo program is fixed.
---
 src/Fl_Graphics_Driver.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/Fl_Graphics_Driver.cxx b/src/Fl_Graphics_Driver.cxx
index b6781914e..e95d3754b 100644
--- a/src/Fl_Graphics_Driver.cxx
+++ b/src/Fl_Graphics_Driver.cxx
@@ -204,7 +204,9 @@ unsigned Fl_Graphics_Driver::font_desc_size() {
  scale() and in slightly modifying that to help support tiled images. */
 void Fl_Graphics_Driver::cache_size(Fl_Image *img, int &width, int &height)
 {
-  if ( int(scale()) == scale() ) {
+  if ( int(scale()) == scale()
+      || width==1 || height==1 // to cover fl_overlay_clear
+      ) {
     width  = width * scale();
     height = height * scale();
   } else {
-- 
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