+ // if game status has not changed, global border has not changed either
+ if (game_status == game_status_last)
+ return FALSE;
+
+ // determine and store new global border bitmap for current game status
+ global_border_bitmap = getGlobalBorderBitmapFromStatus(game_status);
+
+ return (global_border_bitmap_last != global_border_bitmap);
+}
+
+#define ONLY_REDRAW_GLOBAL_BORDER_IF_NEEDED 0
+
+#if ONLY_REDRAW_GLOBAL_BORDER_IF_NEEDED
+static boolean CheckIfGlobalBorderRedrawIsNeeded(void)
+{
+ // if game status has not changed, nothing has to be redrawn
+ if (game_status == game_status_last)
+ return FALSE;
+
+ // redraw if last screen was title screen
+ if (game_status_last == GAME_MODE_TITLE)
+ return TRUE;
+
+ // redraw if global screen border has changed
+ if (CheckIfGlobalBorderHasChanged())
+ return TRUE;
+
+ // redraw if position or size of playfield area has changed
+ if (real_sx_last != REAL_SX || real_sy_last != REAL_SY ||
+ full_sxsize_last != FULL_SXSIZE || full_sysize_last != FULL_SYSIZE)
+ return TRUE;
+
+ // redraw if position or size of door area has changed
+ if (dx_last != DX || dy_last != DY ||
+ dxsize_last != DXSIZE || dysize_last != DYSIZE)
+ return TRUE;
+
+ // redraw if position or size of tape area has changed
+ if (vx_last != VX || vy_last != VY ||
+ vxsize_last != VXSIZE || vysize_last != VYSIZE)
+ return TRUE;
+
+ // redraw if position or size of editor area has changed
+ if (ex_last != EX || ey_last != EY ||
+ exsize_last != EXSIZE || eysize_last != EYSIZE)
+ return TRUE;
+
+ return FALSE;
+}
+#endif
+
+static void RedrawGlobalBorderFromBitmap(Bitmap *bitmap)
+{
+ if (bitmap)
+ BlitBitmap(bitmap, backbuffer, 0, 0, WIN_XSIZE, WIN_YSIZE, 0, 0);
+ else
+ ClearRectangle(backbuffer, 0, 0, WIN_XSIZE, WIN_YSIZE);
+}
+
+void RedrawGlobalBorder(void)
+{
+ Bitmap *bitmap = getGlobalBorderBitmapFromStatus(game_status);
+
+ RedrawGlobalBorderFromBitmap(bitmap);
+
+ redraw_mask = REDRAW_ALL;
+}
+
+static void RedrawGlobalBorderIfNeeded(void)
+{
+#if ONLY_REDRAW_GLOBAL_BORDER_IF_NEEDED
+ if (game_status == game_status_last)
+ return;
+#endif
+
+ // copy current draw buffer to later copy back areas that have not changed
+ if (game_status_last != GAME_MODE_TITLE)
+ BlitBitmap(backbuffer, bitmap_db_store_1, 0, 0, WIN_XSIZE, WIN_YSIZE, 0, 0);
+
+#if ONLY_REDRAW_GLOBAL_BORDER_IF_NEEDED
+ if (CheckIfGlobalBorderRedrawIsNeeded())
+#endif
+ {
+ // redraw global screen border (or clear, if defined to be empty)
+ RedrawGlobalBorderFromBitmap(global_border_bitmap);
+
+ if (game_status == GAME_MODE_EDITOR)
+ DrawSpecialEditorDoor();
+
+ // copy previous playfield and door areas, if they are defined on both
+ // previous and current screen and if they still have the same size
+
+ if (real_sx_last != -1 && real_sy_last != -1 &&
+ REAL_SX != -1 && REAL_SY != -1 &&
+ full_sxsize_last == FULL_SXSIZE && full_sysize_last == FULL_SYSIZE)
+ BlitBitmap(bitmap_db_store_1, backbuffer,
+ real_sx_last, real_sy_last, FULL_SXSIZE, FULL_SYSIZE,
+ REAL_SX, REAL_SY);
+
+ if (dx_last != -1 && dy_last != -1 &&
+ DX != -1 && DY != -1 &&
+ dxsize_last == DXSIZE && dysize_last == DYSIZE)
+ BlitBitmap(bitmap_db_store_1, backbuffer,
+ dx_last, dy_last, DXSIZE, DYSIZE, DX, DY);
+
+ if (game_status != GAME_MODE_EDITOR)
+ {
+ if (vx_last != -1 && vy_last != -1 &&
+ VX != -1 && VY != -1 &&
+ vxsize_last == VXSIZE && vysize_last == VYSIZE)
+ BlitBitmap(bitmap_db_store_1, backbuffer,
+ vx_last, vy_last, VXSIZE, VYSIZE, VX, VY);
+ }
+ else
+ {
+ if (ex_last != -1 && ey_last != -1 &&
+ EX != -1 && EY != -1 &&
+ exsize_last == EXSIZE && eysize_last == EYSIZE)
+ BlitBitmap(bitmap_db_store_1, backbuffer,
+ ex_last, ey_last, EXSIZE, EYSIZE, EX, EY);
+ }
+
+ redraw_mask = REDRAW_ALL;
+ }
+
+ game_status_last = game_status;
+
+ global_border_bitmap_last = global_border_bitmap;
+
+ real_sx_last = REAL_SX;
+ real_sy_last = REAL_SY;
+ full_sxsize_last = FULL_SXSIZE;
+ full_sysize_last = FULL_SYSIZE;
+ dx_last = DX;
+ dy_last = DY;
+ dxsize_last = DXSIZE;
+ dysize_last = DYSIZE;
+ vx_last = VX;
+ vy_last = VY;
+ vxsize_last = VXSIZE;
+ vysize_last = VYSIZE;
+ ex_last = EX;
+ ey_last = EY;
+ exsize_last = EXSIZE;
+ eysize_last = EYSIZE;
+}
+
+void ClearField(void)
+{
+ RedrawGlobalBorderIfNeeded();
+