From c9821c49e08e02532f3ff812ebf8f64230aea7ea Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Mon, 11 Dec 2000 23:36:29 +0100
Subject: [PATCH] rnd-20001211-1-src

---
 src/libgame/sdl.c | 31 +++++++++++++------------------
 src/screens.c     | 25 ++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 19 deletions(-)

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 18de01b3..f0cb1790 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -62,16 +62,18 @@ inline void SDLInitVideoBuffer(DrawBuffer **backbuffer, DrawWindow **window,
 inline boolean SDLSetVideoMode(DrawBuffer **backbuffer, boolean fullscreen)
 {
   boolean success = TRUE;
-  int surface_flags = SDL_HWSURFACE | (fullscreen ? SDL_FULLSCREEN : 0);
+  int surface_flags_fullscreen = SURFACE_FLAGS | SDL_FULLSCREEN;
+  int surface_flags_window = SURFACE_FLAGS;
+  SDL_Surface *new_surface = NULL;
+
+  if (*backbuffer == NULL)
+    *backbuffer = CreateBitmapStruct();
 
   if (fullscreen && !video.fullscreen_enabled && video.fullscreen_available)
   {
     /* switch display to fullscreen mode, if available */
-    DrawWindow *window_old = *backbuffer;
-    DrawWindow *window_new = CreateBitmapStruct();
-
-    if ((window_new->surface = SDL_SetVideoMode(video.width, video.height,
-						video.depth, surface_flags))
+    if ((new_surface = SDL_SetVideoMode(video.width, video.height,
+					video.depth, surface_flags_fullscreen))
 	== NULL)
     {
       /* switching display to fullscreen mode failed */
@@ -83,23 +85,18 @@ inline boolean SDLSetVideoMode(DrawBuffer **backbuffer, boolean fullscreen)
     }
     else
     {
-      if (window_old)
-	FreeBitmap(window_old);
-      *backbuffer = window_new;
+      (*backbuffer)->surface = new_surface;
 
       video.fullscreen_enabled = TRUE;
       success = TRUE;
     }
   }
 
-  if ((!fullscreen && video.fullscreen_enabled) || !*backbuffer)
+  if ((!fullscreen && video.fullscreen_enabled) || new_surface == NULL)
   {
     /* switch display to window mode */
-    DrawWindow *window_old = *backbuffer;
-    DrawWindow *window_new = CreateBitmapStruct();
-
-    if ((window_new->surface = SDL_SetVideoMode(video.width, video.height,
-						video.depth, surface_flags))
+    if ((new_surface = SDL_SetVideoMode(video.width, video.height,
+					video.depth, surface_flags_window))
 	== NULL)
     {
       /* switching display to window mode failed -- should not happen */
@@ -109,9 +106,7 @@ inline boolean SDLSetVideoMode(DrawBuffer **backbuffer, boolean fullscreen)
     }
     else
     {
-      if (window_old)
-	FreeBitmap(window_old);
-      *backbuffer = window_new;
+      (*backbuffer)->surface = new_surface;
 
       video.fullscreen_enabled = FALSE;
       success = TRUE;
diff --git a/src/screens.c b/src/screens.c
index c593ac8f..486ad6d9 100644
--- a/src/screens.c
+++ b/src/screens.c
@@ -62,6 +62,28 @@ void DrawHeadline()
   DrawTextFCentered(46, FC_RED, WINDOW_SUBTITLE_STRING);
 }
 
+static void ToggleFullscreenIfNeeded()
+{
+  if (setup.fullscreen != video.fullscreen_enabled)
+  {
+    /* save old door content */
+    BlitBitmap(backbuffer, pix[PIX_DB_DOOR],
+	       DX, DY, DXSIZE, DYSIZE, DOOR_GFX_PAGEX1, DOOR_GFX_PAGEY1);
+
+    /* toggle fullscreen */
+    setup.fullscreen = ChangeVideoModeIfNeeded(setup.fullscreen);
+
+    /* redraw background to newly created backbuffer */
+    BlitBitmap(pix[PIX_BACK], backbuffer, 0,0, WIN_XSIZE,WIN_YSIZE, 0,0);
+
+    /* restore old door content */
+    BlitBitmap(pix[PIX_DB_DOOR], backbuffer,
+	       DOOR_GFX_PAGEX1, DOOR_GFX_PAGEY1, DXSIZE, DYSIZE, DX, DY);
+
+    redraw_mask = REDRAW_ALL;
+  }
+}
+
 void DrawMainMenu()
 {
   static struct LevelDirInfo *leveldir_last_valid = NULL;
@@ -84,7 +106,8 @@ void DrawMainMenu()
   UndrawSpecialEditorDoor();
 
   /* needed if last screen was the setup screen and fullscreen state changed */
-  setup.fullscreen = ChangeVideoModeIfNeeded(setup.fullscreen);
+  ToggleFullscreenIfNeeded();
+
 #ifdef TARGET_SDL
   SetDrawtoField(DRAW_BACKBUFFER);
 #endif
-- 
2.34.1