diff -r 2d859d34e6f6 -r 8563cc40fc1e hedgewars/uRenderUtils.pas
--- a/hedgewars/uRenderUtils.pas	Mon Apr 01 20:08:34 2019 +0200
+++ b/hedgewars/uRenderUtils.pas	Mon Apr 01 22:07:42 2019 +0200
@@ -38,6 +38,8 @@
 function  RenderStringTexLim(s: ansistring; Color: Longword; font: THWFont; maxLength: LongWord): PTexture;
 function  RenderSpeechBubbleTex(s: ansistring; SpeechType: Longword; font: THWFont): PTexture;
 
+function IsTooDarkToRead(TextColor: Longword): boolean; inline;
+
 implementation
 uses uVariables, uConsts, uTextures, SysUtils, uUtils, uDebug;
 
@@ -76,11 +78,25 @@
     WriteInRoundRect:= WriteInRoundRect(Surface, X, Y, Color, Font, s, 0);
 end;*)
 
+function IsTooDarkToRead(TextColor: LongWord): boolean;
+var clr: TSDL_Color;
+begin
+    clr.r:= (TextColor shr 16) and $FF;
+    clr.g:= (TextColor shr 8) and $FF;
+    clr.b:= TextColor and $FF;
+    IsTooDarkToRead:= ((clr.r >= cInvertTextColorAt) or (clr.g >= cInvertTextColorAt) or (clr.b >= cInvertTextColorAt));
+end;
+
+function IsTooDarkToRead(TextColor: TSDL_COLOR): boolean;
+begin
+    IsTooDarkToRead:= (not ((TextColor.r >= cInvertTextColorAt) or (TextColor.g >= cInvertTextColorAt) or (TextColor.b >= cInvertTextColorAt)));
+end;
+
 function WriteInRoundRect(Surface: PSDL_Surface; X, Y: LongInt; Color: LongWord; Font: THWFont; s: ansistring; maxLength: LongWord): TSDL_Rect;
 var w, h: Longword;
     tmpsurf: PSDL_Surface;
+    finalRect, textRect: TSDL_Rect;
     clr: TSDL_Color;
-    finalRect, textRect: TSDL_Rect;
 begin
     TTF_SizeUTF8(Fontz[Font].Handle, PChar(s), @w, @h);
     if (maxLength > 0) and (w > maxLength * HDPIScaleFactor) then w := maxLength * HDPIScaleFactor;
@@ -92,10 +108,13 @@
     textRect.y:= Y;
     textRect.w:= w;
     textRect.h:= h;
-    DrawRoundRect(@finalRect, cWhiteColor, cNearBlackColor, Surface, true);
     clr.r:= (Color shr 16) and $FF;
     clr.g:= (Color shr 8) and $FF;
     clr.b:= Color and $FF;
+    if (not IsTooDarkToRead(clr)) then
+        DrawRoundRect(@finalRect, cWhiteColor, cNearBlackColor, Surface, true)
+    else
+        DrawRoundRect(@finalRect, cNearBlackColor, cWhiteColor, Surface, true);
     tmpsurf:= TTF_RenderUTF8_Blended(Fontz[Font].Handle, PChar(s), clr);
     finalRect.x:= X + cFontBorder + cFontPadding;
     finalRect.y:= Y + cFontBorder;