+
+ e = Feld[ex][ey];
+
+ if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
+ e = MovingOrBlocked2Element(ex, ey);
+
+ is_empty = (IS_FREE(ex, ey) ||
+ (IS_FREE_OR_PLAYER(ex, ey) && IS_WALKABLE(content_element)));
+
+ is_walkable = (is_empty || IS_WALKABLE(e));
+ is_diggable = (is_empty || IS_DIGGABLE(e));
+ is_collectible = (is_empty || IS_COLLECTIBLE(e));
+ is_destructible = (is_empty || !IS_INDESTRUCTIBLE(e));
+ is_removable = (is_diggable || is_collectible);
+
+ can_replace[xx][yy] =
+ (((change->replace_when == CP_WHEN_EMPTY && is_empty) ||
+ (change->replace_when == CP_WHEN_WALKABLE && is_walkable) ||
+ (change->replace_when == CP_WHEN_DIGGABLE && is_diggable) ||
+ (change->replace_when == CP_WHEN_COLLECTIBLE && is_collectible) ||
+ (change->replace_when == CP_WHEN_REMOVABLE && is_removable) ||
+ (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
+ !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
+
+ if (!can_replace[xx][yy])
+ complete_replace = FALSE;
+ }
+
+ if (!change->only_if_complete || complete_replace)
+ {
+ boolean something_has_changed = FALSE;
+
+ if (change->only_if_complete && change->use_random_replace &&
+ RND(100) < change->random_percentage)
+ return FALSE;
+
+ for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
+ {
+ int ex = x + xx - 1;
+ int ey = y + yy - 1;
+ int content_element;
+
+ if (can_replace[xx][yy] && (!change->use_random_replace ||
+ RND(100) < change->random_percentage))
+ {
+ if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
+ RemoveMovingField(ex, ey);
+
+ ChangeEvent[ex][ey] = ChangeEvent[x][y];
+
+ content_element = change->target_content.e[xx][yy];
+ target_element = GET_TARGET_ELEMENT(element, content_element, change,
+ ce_value, ce_score);
+
+ CreateElementFromChange(ex, ey, target_element);
+
+ something_has_changed = TRUE;
+
+ /* for symmetry reasons, freeze newly created border elements */
+ if (ex != x || ey != y)
+ Stop[ex][ey] = TRUE; /* no more moving in this frame */
+ }
+ }
+
+ if (something_has_changed)
+ {
+ PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
+ PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
+ }
+ }
+ }
+ else
+ {
+ target_element = GET_TARGET_ELEMENT(element, change->target_element, change,
+ ce_value, ce_score);
+
+ if (element == EL_DIAGONAL_GROWING ||
+ element == EL_DIAGONAL_SHRINKING)
+ {
+ target_element = Store[x][y];
+
+ Store[x][y] = EL_EMPTY;
+ }
+
+ CreateElementFromChange(x, y, target_element);
+
+ PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
+ PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
+ }
+
+ /* this uses direct change before indirect change */
+ CheckTriggeredElementChangeByPage(x, y, old_element, CE_CHANGE_OF_X, page);
+
+ return TRUE;
+}
+
+#if USE_NEW_DELAYED_ACTION
+
+static void HandleElementChange(int x, int y, int page)
+{
+ int element = MovingOrBlocked2Element(x, y);
+ struct ElementInfo *ei = &element_info[element];
+ struct ElementChangeInfo *change = &ei->change_page[page];
+
+#ifdef DEBUG
+ if (!CAN_CHANGE_OR_HAS_ACTION(element) &&
+ !CAN_CHANGE_OR_HAS_ACTION(Back[x][y]))
+ {
+ printf("\n\n");
+ printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
+ x, y, element, element_info[element].token_name);
+ printf("HandleElementChange(): This should never happen!\n");
+ printf("\n\n");
+ }
+#endif
+
+ /* this can happen with classic bombs on walkable, changing elements */
+ if (!CAN_CHANGE_OR_HAS_ACTION(element))
+ {
+#if 0
+ if (!CAN_CHANGE(Back[x][y])) /* prevent permanent repetition */
+ ChangeDelay[x][y] = 0;
+#endif
+
+ return;
+ }
+
+ if (ChangeDelay[x][y] == 0) /* initialize element change */
+ {
+ ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
+
+ if (change->can_change)
+ {
+ ResetGfxAnimation(x, y);
+ ResetRandomAnimationValue(x, y);
+
+ if (change->pre_change_function)
+ change->pre_change_function(x, y);
+ }
+ }
+
+ ChangeDelay[x][y]--;
+
+ if (ChangeDelay[x][y] != 0) /* continue element change */
+ {
+ if (change->can_change)
+ {
+ int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
+
+ if (IS_ANIMATED(graphic))
+ DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
+
+ if (change->change_function)
+ change->change_function(x, y);
+ }
+ }
+ else /* finish element change */
+ {
+ if (ChangePage[x][y] != -1) /* remember page from delayed change */
+ {
+ page = ChangePage[x][y];
+ ChangePage[x][y] = -1;
+
+ change = &ei->change_page[page];
+ }
+
+ if (IS_MOVING(x, y)) /* never change a running system ;-) */
+ {
+ ChangeDelay[x][y] = 1; /* try change after next move step */
+ ChangePage[x][y] = page; /* remember page to use for change */
+
+ return;
+ }
+
+ if (change->can_change)
+ {
+ if (ChangeElement(x, y, element, page))
+ {
+ if (change->post_change_function)
+ change->post_change_function(x, y);
+ }
+ }
+
+ if (change->has_action)
+ ExecuteCustomElementAction(x, y, element, page);
+ }
+}
+
+#else
+
+static void HandleElementChange(int x, int y, int page)
+{
+ int element = MovingOrBlocked2Element(x, y);
+ struct ElementInfo *ei = &element_info[element];
+ struct ElementChangeInfo *change = &ei->change_page[page];
+
+#ifdef DEBUG
+ if (!CAN_CHANGE(element) && !CAN_CHANGE(Back[x][y]))
+ {
+ printf("\n\n");
+ printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
+ x, y, element, element_info[element].token_name);
+ printf("HandleElementChange(): This should never happen!\n");
+ printf("\n\n");
+ }
+#endif
+
+ /* this can happen with classic bombs on walkable, changing elements */
+ if (!CAN_CHANGE(element))
+ {
+#if 0
+ if (!CAN_CHANGE(Back[x][y])) /* prevent permanent repetition */
+ ChangeDelay[x][y] = 0;
+#endif
+
+ return;
+ }
+
+ if (ChangeDelay[x][y] == 0) /* initialize element change */
+ {
+ ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
+
+ ResetGfxAnimation(x, y);
+ ResetRandomAnimationValue(x, y);
+
+ if (change->pre_change_function)
+ change->pre_change_function(x, y);
+ }
+
+ ChangeDelay[x][y]--;
+
+ if (ChangeDelay[x][y] != 0) /* continue element change */
+ {
+ int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
+
+ if (IS_ANIMATED(graphic))
+ DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
+
+ if (change->change_function)
+ change->change_function(x, y);
+ }
+ else /* finish element change */
+ {
+ if (ChangePage[x][y] != -1) /* remember page from delayed change */
+ {
+ page = ChangePage[x][y];
+ ChangePage[x][y] = -1;
+
+ change = &ei->change_page[page];