+ /* start with reliable default values */
+ graphic_info[graphic].src_x = 0;
+ graphic_info[graphic].src_y = 0;
+ graphic_info[graphic].width = TILEX;
+ graphic_info[graphic].height = TILEY;
+ graphic_info[graphic].offset_x = 0; /* one or both of these values ... */
+ graphic_info[graphic].offset_y = 0; /* ... will be corrected later */
+
+ /* optional x and y tile position of animation frame sequence */
+ if (parameter[GFX_ARG_XPOS] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].src_x = parameter[GFX_ARG_XPOS] * TILEX;
+ if (parameter[GFX_ARG_YPOS] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].src_y = parameter[GFX_ARG_YPOS] * TILEY;
+
+ /* optional x and y pixel position of animation frame sequence */
+ if (parameter[GFX_ARG_X] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].src_x = parameter[GFX_ARG_X];
+ if (parameter[GFX_ARG_Y] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].src_y = parameter[GFX_ARG_Y];
+
+ /* optional width and height of each animation frame */
+ if (parameter[GFX_ARG_WIDTH] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].width = parameter[GFX_ARG_WIDTH];
+ if (parameter[GFX_ARG_HEIGHT] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].height = parameter[GFX_ARG_HEIGHT];
+
+ /* correct x or y offset dependant of vertical or horizontal frame order */
+ if (parameter[GFX_ARG_VERTICAL]) /* frames are ordered vertically */
+ {
+ if (parameter[GFX_ARG_OFFSET] != ARG_UNDEFINED_VALUE)
+ graphic_info[graphic].offset_y = parameter[GFX_ARG_OFFSET];
+ else
+ graphic_info[graphic].offset_y = graphic_info[graphic].height;
+ }
+ else /* frames are ordered horizontally */