+static int get_special_property_bit(int element, int base_property_bit)
+{
+ static struct
+ {
+ int element;
+ int bit_nr;
+ } pb_can_move_into_acid[] =
+ {
+ /* all element that can move */
+ { EL_BUG, 0 },
+ { EL_BUG_LEFT, 0 },
+ { EL_BUG_RIGHT, 0 },
+ { EL_BUG_UP, 0 },
+ { EL_BUG_DOWN, 0 },
+ { EL_SPACESHIP, 0 },
+ { EL_SPACESHIP_LEFT, 0 },
+ { EL_SPACESHIP_RIGHT, 0 },
+ { EL_SPACESHIP_UP, 0 },
+ { EL_SPACESHIP_DOWN, 0 },
+ { EL_BD_BUTTERFLY, 1 },
+ { EL_BD_BUTTERFLY_LEFT, 1 },
+ { EL_BD_BUTTERFLY_RIGHT, 1 },
+ { EL_BD_BUTTERFLY_UP, 1 },
+ { EL_BD_BUTTERFLY_DOWN, 1 },
+ { EL_BD_FIREFLY, 1 },
+ { EL_BD_FIREFLY_LEFT, 1 },
+ { EL_BD_FIREFLY_RIGHT, 1 },
+ { EL_BD_FIREFLY_UP, 1 },
+ { EL_BD_FIREFLY_DOWN, 1 },
+ { EL_YAMYAM, 2 },
+ { EL_DARK_YAMYAM, 2 },
+ { EL_ROBOT, 3 },
+ { EL_PACMAN, 4 },
+ { EL_PACMAN_LEFT, 4 },
+ { EL_PACMAN_RIGHT, 4 },
+ { EL_PACMAN_UP, 4 },
+ { EL_PACMAN_DOWN, 4 },
+ { EL_MOLE, 4 },
+ { EL_MOLE_LEFT, 4 },
+ { EL_MOLE_RIGHT, 4 },
+ { EL_MOLE_UP, 4 },
+ { EL_MOLE_DOWN, 4 },
+ { EL_PENGUIN, 5 },
+ { EL_PIG, 6 },
+ { EL_DRAGON, 6 },
+ { EL_SATELLITE, 7 },
+ { EL_SP_SNIKSNAK, 8 },
+ { EL_SP_ELECTRON, 8 },
+ { EL_BALLOON, 9 },
+ { EL_SPRING, 10 },
+
+ { -1, -1 },
+ };
+ int i;
+
+ if (base_property_bit != EP_CAN_MOVE_INTO_ACID)
+ return -1;
+
+ for (i = 0; pb_can_move_into_acid[i].element != -1; i++)
+ if (pb_can_move_into_acid[i].element == element)
+ return pb_can_move_into_acid[i].bit_nr;
+
+ return -1;
+}
+
+void setMoveIntoAcidProperty(struct LevelInfo *level, int element, boolean set)
+{
+ int bit_nr = get_special_property_bit(element, EP_CAN_MOVE_INTO_ACID);
+
+ if (bit_nr > -1)
+ {
+ level->can_move_into_acid &= ~(1 << bit_nr);
+
+ if (set)
+ level->can_move_into_acid |= (1 << bit_nr);
+ }
+}
+
+boolean getMoveIntoAcidProperty(struct LevelInfo *level, int element)
+{
+ int bit_nr = get_special_property_bit(element, EP_CAN_MOVE_INTO_ACID);
+
+ if (bit_nr > -1)
+ return ((level->can_move_into_acid & (1 << bit_nr)) != 0);
+
+ return FALSE;
+}
+