+#endif
+}
+
+void BackToFront_EM(void)
+{
+ static int screen_x_last = -1, screen_y_last = -1;
+ static boolean scrolling_last = FALSE;
+ int left = screen_x / TILEX;
+ int top = screen_y / TILEY;
+#if 1
+ boolean scrolling = (screen_x != screen_x_last || screen_y != screen_y_last);
+#else
+ boolean scrolling = (screen_x % TILEX != 0 || screen_y % TILEY != 0);
+#endif
+ int x, y;
+
+#if 0
+ printf("::: %d, %d\n", screen_x, screen_y);
+#endif
+
+ SyncDisplay();
+
+ if (redraw_tiles > REDRAWTILES_THRESHOLD || scrolling || scrolling_last)
+ {
+ /* blit all (up to four) parts of the scroll buffer to the backbuffer */
+ BlitScreenToBitmap_EM(backbuffer);
+
+ /* blit the completely updated backbuffer to the window (in one blit) */
+ BlitBitmap(backbuffer, window, SX, SY, SXSIZE, SYSIZE, SX, SY);
+ }
+ else
+ {
+#if 1
+#if 1
+ boolean half_shifted_x = (screen_x % TILEX != 0);
+ boolean half_shifted_y = (screen_y % TILEY != 0);
+#else
+ boolean half_shifted_x = (EVEN(SCR_FIELDX) && screen_x % TILEX != 0);
+ boolean half_shifted_y = (EVEN(SCR_FIELDY) && screen_y % TILEY != 0);
+#endif
+
+ int sx, sy;
+#if 0
+ int sxsize, sysize;
+#endif
+ int xsize = SXSIZE;
+ int ysize = SYSIZE;
+ int full_xsize = lev.width * TILEX;
+ int full_ysize = lev.height * TILEY;
+
+#if 0
+ sxsize = (full_xsize < xsize ? full_xsize : xsize);
+ sysize = (full_ysize < ysize ? full_ysize : ysize);
+#endif
+ sx = SX + (full_xsize < xsize ? (xsize - full_xsize) / 2 : 0);
+ sy = SY + (full_ysize < ysize ? (ysize - full_ysize) / 2 : 0);
+
+#if 0
+#if 1
+ printf("::: %d, %d\n", EVEN(SCR_FIELDX), screen_x);
+#else
+ half_shifted_x = TRUE;
+ half_shifted_y = FALSE;
+#endif
+#endif
+
+ int x1 = 0, x2 = SCR_FIELDX - (half_shifted_x ? 0 : 1);
+ int y1 = 0, y2 = SCR_FIELDY - (half_shifted_y ? 0 : 1);
+ int scroll_xoffset = (half_shifted_x ? TILEX / 2 : 0);
+ int scroll_yoffset = (half_shifted_y ? TILEY / 2 : 0);
+
+ InitGfxClipRegion(TRUE, SX, SY, SXSIZE, SYSIZE);
+
+ for (x = x1; x <= x2; x++)
+ {
+ for (y = y1; y <= y2; y++)
+ {
+ int xx = (left + x) % MAX_BUF_XSIZE;
+ int yy = (top + y) % MAX_BUF_YSIZE;
+
+ if (redraw[xx][yy])
+ BlitBitmap(screenBitmap, window,
+ xx * TILEX, yy * TILEY, TILEX, TILEY,
+ sx + x * TILEX - scroll_xoffset,
+ sy + y * TILEY - scroll_yoffset);
+ }
+ }
+
+ InitGfxClipRegion(FALSE, -1, -1, -1, -1);
+
+#else
+
+ for (x = 0; x < SCR_FIELDX; x++)
+ {
+ for (y = 0; y < SCR_FIELDY; y++)
+ {
+ int xx = (left + x) % MAX_BUF_XSIZE;
+ int yy = (top + y) % MAX_BUF_YSIZE;
+
+ if (redraw[xx][yy])
+ BlitBitmap(screenBitmap, window,
+ xx * TILEX, yy * TILEY, TILEX, TILEY,
+ SX + x * TILEX, SY + y * TILEY);
+ }
+ }
+#endif
+ }
+
+ FlushDisplay();
+
+ for (x = 0; x < MAX_BUF_XSIZE; x++)
+ for (y = 0; y < MAX_BUF_YSIZE; y++)
+ redraw[x][y] = FALSE;
+ redraw_tiles = 0;
+
+ screen_x_last = screen_x;
+ screen_y_last = screen_y;
+ scrolling_last = scrolling;
+}
+
+void blitscreen(void)
+{
+ BackToFront_EM();
+}
+
+static struct GraphicInfo_EM *getObjectGraphic(int x, int y)
+{
+ int tile = Draw[y][x];
+ struct GraphicInfo_EM *g = &graphic_info_em_object[tile][frame];
+
+ if (!game.use_native_emc_graphics_engine)
+ getGraphicSourceObjectExt_EM(g, tile, 7 - frame, x - 2, y - 2);
+
+ return g;
+}
+
+static struct GraphicInfo_EM *getPlayerGraphic(int player_nr, int anim)
+{
+ struct GraphicInfo_EM *g = &graphic_info_em_player[player_nr][anim][frame];
+
+ if (!game.use_native_emc_graphics_engine)
+ getGraphicSourcePlayerExt_EM(g, player_nr, anim, 7 - frame);
+
+ return g;
+}