+static void DrawLevelFieldCrumbledSandExtBlitInner(int x, int y, int dx, int dy,
+ int graphic)
+{
+ Bitmap *src_bitmap;
+ int src_x, src_y;
+ int width, height, cx, cy;
+ int sx = SCREENX(x), sy = SCREENY(y);
+ int crumbled_border_size = graphic_info[graphic].border_size;
+ int i;
+
+ getGraphicSource(graphic, 0, &src_bitmap, &src_x, &src_y);
+
+ for (i = 1; i < 4; i++)
+ {
+ int dxx = (i & 1 ? dx : 0);
+ int dyy = (i & 2 ? dy : 0);
+ int xx = x + dxx;
+ int yy = y + dyy;
+ int element = (IN_LEV_FIELD(xx, yy) ? TILE_GFX_ELEMENT(xx, yy) :
+ BorderElement);
+
+ /* check if neighbour field is of same crumble type */
+ boolean same = (IS_CRUMBLED_TILE(xx, yy, element) &&
+ graphic_info[graphic].class ==
+ graphic_info[el_act2crm(element, ACTION_DEFAULT)].class);
+
+ /* return if check prevents inner corner */
+ if (same == (dxx == dx && dyy == dy))
+ return;
+ }
+
+ /* if we reach this point, we have an inner corner */
+
+ getGraphicSource(graphic, 1, &src_bitmap, &src_x, &src_y);
+
+ width = crumbled_border_size;
+ height = crumbled_border_size;
+ cx = (dx > 0 ? TILEX - crumbled_border_size : 0);
+ cy = (dy > 0 ? TILEY - crumbled_border_size : 0);
+
+ BlitBitmap(src_bitmap, drawto_field, src_x + cx, src_y + cy,
+ width, height, FX + sx * TILEX + cx, FY + sy * TILEY + cy);
+}
+
+static void DrawLevelFieldCrumbledSandExtBlit(int x, int y,
+ int graphic, int frame, int dir)