void imtk_layout_newline(void);
void imtk_layout_get_pos(int *x, int *y);
void imtk_layout_get_bounds(int *bbox);
+int imtk_layout_contains(int x, int y);
/* defined in draw.c */
void imtk_set_color(unsigned int col, float r, float g, float b, float a);