+ struct GraphicInfo_BD *g_old = &graphic_info_bd_object[tile_last][frame];
+
+ blit_bitmap(g_old->bitmap, dest, g_old->src_x, g_old->src_y, cell_size, cell_size,
+ sx, sy);
+ }
+
+ /* get cave field position the game element is moving from */
+ int dx = (dir == GD_MV_LEFT ? +1 : dir == GD_MV_RIGHT ? -1 : 0);
+ int dy = (dir == GD_MV_UP ? +1 : dir == GD_MV_DOWN ? -1 : 0);
+ int old_x = cave->getx(cave, x + dx, y + dy);
+ int old_y = cave->gety(cave, x + dx, y + dy);
+ int tile_from = game->element_buffer[old_y][old_x];
+ struct GraphicInfo_BD *g_from = &graphic_info_bd_object[tile_from][frame];
+ boolean old_is_player = is_player(tile_from);
+ boolean old_is_moving = (game->dir_buffer[old_y][old_x] != GD_MV_STILL);
+ boolean old_is_visible = (old_x >= cave->x1 &&
+ old_x <= cave->x2 &&
+ old_y >= cave->y1 &&
+ old_y <= cave->y2);
+
+ if (old_is_visible)
+ {
+ if (!old_is_moving && !old_is_player)
+ {
+ /* redraw game element on the cave field the element is moving from */
+ blit_bitmap(g_from->bitmap, dest, g_from->src_x, g_from->src_y, cell_size, cell_size,
+ sx + dx * cell_size, sy + dy * cell_size);
+
+ game->element_buffer[old_y][old_x] |= SKIPPED;
+ }
+ else
+ {
+ /* if old tile also moving (like pushing player), do not redraw tile background */
+ game->last_element_buffer[old_y][old_x] |= SKIPPED;
+ }
+ }
+
+ /* get shifted position between cave fields the game element is moving from/to */
+ int itercycle = MIN(MAX(0, game->itermax - game->itercycle - 1), game->itermax);
+ int shift = cell_size * itercycle / game->itermax;
+
+ blit_bitmap(g->bitmap, dest, g->src_x, g->src_y, cell_size, cell_size,
+ sx + dx * shift, sy + dy * shift);
+
+ /* special case: redraw player snapping a game element */
+ if (old_is_visible && old_is_player && !old_is_moving)
+ {
+ /* redraw game element on the cave field the element is moving from */
+ blit_bitmap(g_from->bitmap, dest, g_from->src_x, g_from->src_y, cell_size, cell_size,
+ sx + dx * cell_size, sy + dy * cell_size);
+ }
+ }
+ else
+ {
+ blit_bitmap(g->bitmap, dest, g->src_x, g->src_y, cell_size, cell_size, sx, sy);
+ }