From dc76e42346b67941a3e3300974c39fc169cda2f3 Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Wed, 9 May 2018 22:26:49 +0200
Subject: [PATCH] added empty borders between different virtual buttons

---
 src/libgame/sdl.c | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 877bb16e..0fd3aa62 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -3050,14 +3050,39 @@ static void DrawTouchInputOverlay_ShowGridButtons(int alpha)
 
   for (x = 0; x < grid_xsize; x++)
   {
-    rect.x = (x + 0) * video.screen_width / grid_xsize;
-    rect.w = (x + 1) * video.screen_width / grid_xsize - rect.x;
-
     for (y = 0; y < grid_ysize; y++)
     {
+      rect.x = (x + 0) * video.screen_width  / grid_xsize;
       rect.y = (y + 0) * video.screen_height / grid_ysize;
+      rect.w = (x + 1) * video.screen_width  / grid_xsize - rect.x;
       rect.h = (y + 1) * video.screen_height / grid_ysize - rect.y;
 
+      if (x == 0 ||
+	  overlay.grid_button[x - 1][y] != overlay.grid_button[x][y])
+      {
+	rect.x += 2;
+	rect.w -= 2;
+      }
+
+      if (x == grid_xsize - 1 ||
+	  overlay.grid_button[x + 1][y] != overlay.grid_button[x][y])
+      {
+	rect.w -= 2;
+      }
+
+      if (y == 0 ||
+	  overlay.grid_button[x][y - 1] != overlay.grid_button[x][y])
+      {
+	rect.y += 2;
+	rect.h -= 2;
+      }
+
+      if (y == grid_ysize - 1 ||
+	  overlay.grid_button[x][y + 1] != overlay.grid_button[x][y])
+      {
+	rect.h -= 2;
+      }
+
       if (overlay.grid_button[x][y] == overlay.grid_button_highlight)
 	SDL_SetRenderDrawColor(sdl_renderer, 255, 255, 255, alpha_highlight);
       else
-- 
2.34.1