FM / private

/usr/include/mysql/server/private

Name	Size	Mode	Actions
atomic/	-	0755	rm
data/	-	0755	rm
providers/	-	0755	rm
aligned.h	1136	0644	edit dl rm
aria_backup.h	1787	0644	edit dl rm
assume_aligned.h	2350	0644	edit dl rm
authors.h	10194	0644	edit dl rm
backup.h	1703	0644	edit dl rm
bounded_queue.h	6093	0644	edit dl rm
client_settings.h	1935	0644	edit dl rm
compat56.h	2280	0644	edit dl rm
config.h	14351	0644	edit dl rm
contributors.h	4931	0644	edit dl rm
create_options.h	4193	0644	edit dl rm
create_tmp_table.h	2808	0644	edit dl rm
cset_narrowing.h	3968	0644	edit dl rm
custom_conf.h	1082	0644	edit dl rm
datadict.h	1700	0644	edit dl rm
ddl_log.h	12807	0644	edit dl rm
debug.h	1234	0644	edit dl rm
debug_sync.h	2046	0644	edit dl rm
derived_handler.h	2379	0644	edit dl rm
derror.h	980	0644	edit dl rm
des_key_file.h	1236	0644	edit dl rm
discover.h	1570	0644	edit dl rm
dur_prop.h	1082	0644	edit dl rm
embedded_priv.h	1733	0644	edit dl rm
events.h	4704	0644	edit dl rm
event_data_objects.h	4187	0644	edit dl rm
event_db_repository.h	3648	0644	edit dl rm
event_parse_data.h	2899	0644	edit dl rm
event_queue.h	3438	0644	edit dl rm
event_scheduler.h	3290	0644	edit dl rm
field.h	222414	0644	edit dl rm
field_comp.h	1174	0644	edit dl rm
filesort.h	7283	0644	edit dl rm
filesort_utils.h	8195	0644	edit dl rm
ft_global.h	3113	0644	edit dl rm
gcalc_slicescan.h	17330	0644	edit dl rm
gcalc_tools.h	11900	0644	edit dl rm
grant.h	2758	0644	edit dl rm
group_by_handler.h	3534	0644	edit dl rm
gstream.h	2437	0644	edit dl rm
handler.h	199857	0644	edit dl rm
handle_connections_win.h	884	0644	edit dl rm
hash.h	4452	0644	edit dl rm
hash_filo.h	5599	0644	edit dl rm
ha_handler_stats.h	2335	0644	edit dl rm
ha_partition.h	64696	0644	edit dl rm
ha_sequence.h	6245	0644	edit dl rm
heap.h	9487	0644	edit dl rm
hostname.h	5419	0644	edit dl rm
ilist.h	7237	0644	edit dl rm
init.h	852	0644	edit dl rm
innodb_priv.h	1319	0644	edit dl rm
item.h	285458	0644	edit dl rm
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item_sum.h	72695	0644	edit dl rm
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item_vers.h	4413	0644	edit dl rm
item_windowfunc.h	35089	0644	edit dl rm
item_xmlfunc.h	4650	0644	edit dl rm
json_table.h	9667	0644	edit dl rm
key.h	2132	0644	edit dl rm
keycaches.h	1995	0644	edit dl rm
lex.h	29840	0644	edit dl rm
lex_charset.h	24313	0644	edit dl rm
lex_hash.h	143108	0644	edit dl rm
lex_ident.h	2122	0644	edit dl rm
lex_string.h	4077	0644	edit dl rm
lex_symbol.h	1323	0644	edit dl rm
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lf.h	6462	0644	edit dl rm
lock.h	2220	0644	edit dl rm
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maria.h	5872	0644	edit dl rm
mariadb.h	1277	0644	edit dl rm
mdl.h	38893	0644	edit dl rm
mem_root_array.h	7106	0644	edit dl rm
message.h	1195	0644	edit dl rm
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myisam.h	17506	0644	edit dl rm
myisamchk.h	4734	0644	edit dl rm
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mysqld.h	41225	0644	edit dl rm
mysqld_default_groups.h	204	0644	edit dl rm
mysqld_suffix.h	1201	0644	edit dl rm
mysys_err.h	3022	0644	edit dl rm
my_alarm.h	2429	0644	edit dl rm
my_apc.h	4747	0644	edit dl rm
my_atomic.h	7281	0644	edit dl rm
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my_base.h	27750	0644	edit dl rm
my_bit.h	6196	0644	edit dl rm
my_bitmap.h	5502	0644	edit dl rm
my_check_opt.h	2618	0644	edit dl rm
my_compare.h	11194	0644	edit dl rm
my_counter.h	1721	0644	edit dl rm
my_cpu.h	4885	0644	edit dl rm
my_crypt.h	904	0644	edit dl rm
my_decimal.h	14504	0644	edit dl rm
my_default.h	1880	0644	edit dl rm
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my_json_writer.h	18706	0644	edit dl rm
my_libwrap.h	1183	0644	edit dl rm
my_md5.h	1486	0644	edit dl rm
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parse_file.h	4424	0644	edit dl rm
partition_element.h	5428	0644	edit dl rm
partition_info.h	19864	0644	edit dl rm
password.h	1621	0644	edit dl rm
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pfs_transaction_provider.h	2846	0644	edit dl rm
privilege.h	28853	0644	edit dl rm
probes_mysql.h	973	0644	edit dl rm
probes_mysql_nodtrace.h	6087	0644	edit dl rm
procedure.h	6819	0644	edit dl rm
protocol.h	12537	0644	edit dl rm
proxy_protocol.h	548	0644	edit dl rm
queues.h	3477	0644	edit dl rm
records.h	3147	0644	edit dl rm
replication.h	16130	0644	edit dl rm
repl_failsafe.h	1585	0644	edit dl rm
rijndael.h	1711	0644	edit dl rm
rowid_filter.h	15474	0644	edit dl rm
rpl_constants.h	3357	0644	edit dl rm
rpl_filter.h	4774	0644	edit dl rm
rpl_gtid.h	29985	0644	edit dl rm
rpl_injector.h	9621	0644	edit dl rm
rpl_mi.h	16636	0644	edit dl rm
rpl_parallel.h	18228	0644	edit dl rm
rpl_record.h	1585	0644	edit dl rm
rpl_record_old.h	1407	0644	edit dl rm
rpl_reporting.h	3713	0644	edit dl rm
rpl_rli.h	36070	0644	edit dl rm
rpl_tblmap.h	3177	0644	edit dl rm
rpl_utility.h	9800	0644	edit dl rm
scheduler.h	3199	0644	edit dl rm
scope.h	4393	0644	edit dl rm
select_handler.h	2228	0644	edit dl rm
semisync.h	2287	0644	edit dl rm
semisync_master.h	25764	0644	edit dl rm
semisync_master_ack_receiver.h	8709	0644	edit dl rm
semisync_slave.h	3736	0644	edit dl rm
service_versions.h	2285	0644	edit dl rm
session_tracker.h	14275	0644	edit dl rm
set_var.h	17331	0644	edit dl rm
slave.h	12392	0644	edit dl rm
socketpair.h	842	0644	edit dl rm
source_revision.h	67	0644	edit dl rm
sp.h	22588	0644	edit dl rm
span.h	3931	0644	edit dl rm
spatial.h	22698	0644	edit dl rm
sp_cache.h	2037	0644	edit dl rm
sp_head.h	64917	0644	edit dl rm
sp_pcontext.h	25427	0644	edit dl rm
sp_rcontext.h	14441	0644	edit dl rm
sql_acl.h	14167	0644	edit dl rm
sql_admin.h	2915	0644	edit dl rm
sql_alloc.h	1732	0644	edit dl rm
sql_alter.h	15395	0644	edit dl rm
sql_analyse.h	11052	0644	edit dl rm
sql_analyze_stmt.h	12683	0644	edit dl rm
sql_array.h	6858	0644	edit dl rm
sql_audit.h	14162	0644	edit dl rm
sql_base.h	26050	0644	edit dl rm
sql_basic_types.h	9523	0644	edit dl rm
sql_binlog.h	895	0644	edit dl rm
sql_bitmap.h	7842	0644	edit dl rm
sql_bootstrap.h	1812	0644	edit dl rm
sql_cache.h	21676	0644	edit dl rm
sql_callback.h	1542	0644	edit dl rm
sql_class.h	271836	0644	edit dl rm
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sql_connect.h	4087	0644	edit dl rm
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sql_cursor.h	4428	0644	edit dl rm
sql_db.h	2438	0644	edit dl rm
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sql_delete.h	1343	0644	edit dl rm
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sql_do.h	954	0644	edit dl rm
sql_error.h	39843	0644	edit dl rm
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sql_expression_cache.h	4359	0644	edit dl rm
sql_get_diagnostics.h	7883	0644	edit dl rm
sql_handler.h	2910	0644	edit dl rm
sql_help.h	995	0644	edit dl rm
sql_hset.h	3401	0644	edit dl rm
sql_insert.h	5173	0644	edit dl rm
sql_i_s.h	8487	0644	edit dl rm
sql_join_cache.h	48659	0644	edit dl rm
sql_lex.h	174931	0644	edit dl rm
sql_lifo_buffer.h	9685	0644	edit dl rm
sql_limit.h	3187	0644	edit dl rm
sql_list.h	22391	0644	edit dl rm
sql_load.h	1276	0644	edit dl rm
sql_locale.h	2701	0644	edit dl rm
sql_manager.h	960	0644	edit dl rm
sql_mode.h	6735	0644	edit dl rm
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sql_partition.h	12674	0644	edit dl rm
sql_partition_admin.h	5940	0644	edit dl rm
sql_plist.h	7711	0644	edit dl rm
sql_plugin.h	7577	0644	edit dl rm
sql_plugin_compat.h	2237	0644	edit dl rm
sql_prepare.h	11409	0644	edit dl rm
sql_priv.h	18528	0644	edit dl rm
sql_profile.h	7816	0644	edit dl rm
sql_reload.h	1036	0644	edit dl rm
sql_rename.h	982	0644	edit dl rm
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sql_schema.h	3303	0644	edit dl rm
sql_select.h	89743	0644	edit dl rm
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sql_servers.h	1777	0644	edit dl rm
sql_show.h	9819	0644	edit dl rm
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sql_table.h	9812	0644	edit dl rm
sql_test.h	2665	0644	edit dl rm
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structs.h	29457	0644	edit dl rm
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table.h	119009	0644	edit dl rm
table_cache.h	4232	0644	edit dl rm
threadpool.h	4810	0644	edit dl rm
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threadpool_winsockets.h	2290	0644	edit dl rm
thread_cache.h	5905	0644	edit dl rm
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transaction.h	1466	0644	edit dl rm
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wsrep_xid.h	1509	0644	edit dl rm
xa.h	1845	0644	edit dl rm

Edit: /usr/include/mysql/server/private/gcalc_slicescan.h (17330B)

This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#ifndef GCALC_SLICESCAN_INCLUDED
#define GCALC_SLICESCAN_INCLUDED

#ifndef DBUG_OFF
// #define GCALC_CHECK_WITH_FLOAT
#else
#define GCALC_DBUG_OFF
#endif /*DBUG_OFF*/

#ifndef GCALC_DBUG_OFF
#define GCALC_DBUG_PRINT(b) DBUG_PRINT("Gcalc", b)
#define GCALC_DBUG_ENTER(a) DBUG_ENTER("Gcalc " a)
#define GCALC_DBUG_RETURN(r) DBUG_RETURN(r)
#define GCALC_DBUG_VOID_RETURN DBUG_VOID_RETURN
#define GCALC_DBUG_ASSERT(r) DBUG_ASSERT(r)
#else
#define GCALC_DBUG_PRINT(b)     do {} while(0)
#define GCALC_DBUG_ENTER(a)     do {} while(0)
#define GCALC_DBUG_RETURN(r)    return (r)
#define GCALC_DBUG_VOID_RETURN  do {} while(0)
#define GCALC_DBUG_ASSERT(r)    do {} while(0)
#endif /*GCALC_DBUG_OFF*/

#define GCALC_TERMINATED(state_var) (state_var && (*state_var))
#define GCALC_SET_TERMINATED(state_var, val) state_var= val
#define GCALC_DECL_TERMINATED_STATE(varname) \
  volatile int *varname;

/*
  Gcalc_dyn_list class designed to manage long lists of same-size objects
  with the possible efficiency.
  It allocates fixed-size blocks of memory (blk_size specified at the time
  of creation). When new object is added to the list, it occupies part of
  this block until it's full. Then the new block is allocated.
  Freed objects are chained to the m_free list, and if it's not empty, the
  newly added object is taken from this list instead the block.
*/

class Gcalc_dyn_list
{
public:
  class Item
  {
  public:
    Item *next;
  };

Gcalc_dyn_list(size_t blk_size, size_t sizeof_item);
  Gcalc_dyn_list(const Gcalc_dyn_list &dl);
  ~Gcalc_dyn_list();
  Item *new_item()
  {
    Item *result;
    if (m_free)
    {
      result= m_free;
      m_free= m_free->next;
    }
    else
      result= alloc_new_blk();

return result;
  }
  inline void free_item(Item *item)
  {
    item->next= m_free;
    m_free= item;
  }
  inline void free_list(Item **list, Item **hook)
  {
    *hook= m_free;
    m_free= *list;
  }

void free_list(Item *list)
  {
    Item **hook= &list;
    while (*hook)
      hook= &(*hook)->next;
    free_list(&list, hook);
  }

void reset();
  void cleanup();

protected:
  size_t m_blk_size;
  size_t m_sizeof_item;
  unsigned int m_points_per_blk;
  void *m_first_blk;
  void **m_blk_hook;
  Item *m_free;
  Item *m_keep;

Item *alloc_new_blk();
  void format_blk(void* block);
  inline Item *ptr_add(Item *ptr, int n_items)
  {
    return (Item *)(((char*)ptr) + n_items * m_sizeof_item);
  }
};

/* Internal Gcalc coordinates to provide the precise calculations */

#define GCALC_DIG_BASE     1000000000
typedef uint32 gcalc_digit_t;
typedef unsigned long long gcalc_coord2;
typedef gcalc_digit_t Gcalc_internal_coord;
#define GCALC_COORD_BASE 2
#define GCALC_COORD_BASE2 4
#define GCALC_COORD_BASE3 6
#define GCALC_COORD_BASE4 8
#define GCALC_COORD_BASE5 10

typedef gcalc_digit_t Gcalc_coord1[GCALC_COORD_BASE];
typedef gcalc_digit_t Gcalc_coord2[GCALC_COORD_BASE*2];
typedef gcalc_digit_t Gcalc_coord3[GCALC_COORD_BASE*3];

void gcalc_mul_coord(Gcalc_internal_coord *result, int result_len,
                     const Gcalc_internal_coord *a, int a_len,
                     const Gcalc_internal_coord *b, int b_len);

void gcalc_add_coord(Gcalc_internal_coord *result, int result_len,
                     const Gcalc_internal_coord *a,
                     const Gcalc_internal_coord *b);

void gcalc_sub_coord(Gcalc_internal_coord *result, int result_len,
                     const Gcalc_internal_coord *a,
                     const Gcalc_internal_coord *b);

int gcalc_cmp_coord(const Gcalc_internal_coord *a,
                    const Gcalc_internal_coord *b, int len);

/* Internal coordinates declarations end. */

typedef uint gcalc_shape_info;

/*
  Gcalc_heap represents the 'dynamic list' of Info objects, that
  contain information about vertexes of all the shapes that take
  part in some spatial calculation. Can become quite long.
  After filled, the list is usually sorted and then walked through
  in the slicescan algorithm.
  The Gcalc_heap and the algorithm can only operate with two
  kinds of shapes - polygon and polyline. So all the spatial
  objects should be represented as sets of these two.
*/

class Gcalc_heap : public Gcalc_dyn_list
{
public:
  enum node_type
  {
    nt_shape_node,
    nt_intersection,
    nt_eq_node
  };
  class Info : public Gcalc_dyn_list::Item
  {
  public:
    node_type type;
    union
    {
      struct
      {
        /* nt_shape_node */
        gcalc_shape_info shape;
        Info *left;
        Info *right;
        double x,y;
        Gcalc_coord1 ix, iy;
        int top_node;
      } shape;
      struct
      {
        /* nt_intersection */
        /* Line p1-p2 supposed to intersect line p3-p4 */
        const Info *p1;
        const Info *p2;
        const Info *p3;
        const Info *p4;
        void *data;
        int equal;
      } intersection;
      struct
      {
        /* nt_eq_node */
        const Info *node;
        void *data;
      } eq;
    } node;

bool is_bottom() const
      { GCALC_DBUG_ASSERT(type == nt_shape_node); return !node.shape.left; }
    bool is_top() const
      { GCALC_DBUG_ASSERT(type == nt_shape_node); return node.shape.top_node; }
    bool is_single_node() const
      { return is_bottom() && is_top(); }

void calc_intersection_xy(double *x, double *y) const;
    void get_xy(double *x, double *y) const;
    int equal_pi(const Info *pi) const;
#ifdef GCALC_CHECK_WITH_FLOAT
    void calc_xy_ld(long double *x, long double *y) const;
#endif /*GCALC_CHECK_WITH_FLOAT*/

Info *get_next() { return (Info *)next; }
    const Info *get_next() const { return (const Info *)next; }
  };

Gcalc_heap(size_t blk_size=8192) :
    Gcalc_dyn_list(blk_size, sizeof(Info)),
    m_hook(&m_first), m_n_points(0)
  {}

Gcalc_heap(const Gcalc_heap &gh) :
    Gcalc_dyn_list(gh),
    m_hook(&m_first), m_n_points(0)
  {}

void set_extent(double xmin, double xmax, double ymin, double ymax);
  Info *new_point_info(double x, double y, gcalc_shape_info shape);
  void free_point_info(Info *i, Gcalc_dyn_list::Item **i_hook);
  Info *new_intersection(const Info *p1, const Info *p2,
                         const Info *p3, const Info *p4);
  void prepare_operation();
  inline bool ready() const { return m_hook == NULL; }
  Info *get_first() { return (Info *)m_first; }
  const Info *get_first() const { return (const Info *)m_first; }
  Gcalc_dyn_list::Item **get_last_hook() { return m_hook; }
  void reset();
#ifdef GCALC_CHECK_WITH_FLOAT
  long double get_double(const Gcalc_internal_coord *c) const;
#endif /*GCALC_CHECK_WITH_FLOAT*/
  double coord_extent;
  Gcalc_dyn_list::Item **get_cur_hook() { return m_hook; }

private:
  Gcalc_dyn_list::Item *m_first;
  Gcalc_dyn_list::Item **m_hook;
  int m_n_points;
};

/*
  the spatial object has to be represented as a set of
  simple polygones and polylines to be sent to the slicescan.

Gcalc_shape_transporter class and his descendants are used to
  simplify storing the information about the shape into necessary structures.
  This base class only fills the Gcalc_heap with the information about
  shapes and vertices.

Normally the Gcalc_shape_transporter family object is sent as a parameter
  to the 'get_shapes' method of an 'spatial' object so it can pass
  the spatial information about itself. The virtual methods are
  treating this data in a way the caller needs.
*/

class Gcalc_shape_transporter
{
private:
  Gcalc_heap::Info *m_first;
  Gcalc_heap::Info *m_prev;
  Gcalc_dyn_list::Item **m_prev_hook;
  int m_shape_started;
  void int_complete();
protected:
  Gcalc_heap *m_heap;
  int int_single_point(gcalc_shape_info Info, double x, double y);
  int int_add_point(gcalc_shape_info Info, double x, double y);
  void int_start_line()
  {
    DBUG_ASSERT(!m_shape_started);
    m_shape_started= 1;
    m_first= m_prev= NULL;
  }
  void int_complete_line()
  {
    DBUG_ASSERT(m_shape_started== 1);
    int_complete();
    m_shape_started= 0;
  }
  void int_start_ring()
  {
    DBUG_ASSERT(m_shape_started== 2);
    m_shape_started= 3;
    m_first= m_prev= NULL;
  }
  void int_complete_ring()
  {
    DBUG_ASSERT(m_shape_started== 3);
    int_complete();
    m_shape_started= 2;
  }
  void int_start_poly()
  {
    DBUG_ASSERT(!m_shape_started);
    m_shape_started= 2;
  }
  void int_complete_poly()
  {
    DBUG_ASSERT(m_shape_started== 2);
    m_shape_started= 0;
  }
  bool line_started() { return m_shape_started == 1; };
public:
  Gcalc_shape_transporter(Gcalc_heap *heap) :
    m_shape_started(0), m_heap(heap) {}

virtual int single_point(double x, double y)=0;
  virtual int start_line()=0;
  virtual int complete_line()=0;
  virtual int start_poly()=0;
  virtual int complete_poly()=0;
  virtual int start_ring()=0;
  virtual int complete_ring()=0;
  virtual int add_point(double x, double y)=0;
  virtual int start_collection(int n_objects) { return 0; }
  virtual int empty_shape() { return 0; }
  int start_simple_poly()
  {
    return start_poly() || start_ring();
  }
  int complete_simple_poly()
  {
    return complete_ring() || complete_poly();
  }
  virtual ~Gcalc_shape_transporter() = default;
};

enum Gcalc_scan_events
{
  scev_none= 0,
  scev_point= 1,         /* Just a new point in thread */
  scev_thread= 2,        /* Start of the new thread */
  scev_two_threads= 4,   /* A couple of new threads started */
  scev_intersection= 8,  /* Intersection happened */
  scev_end= 16,          /* Single thread finished */
  scev_two_ends= 32,     /* A couple of threads finished */
  scev_single_point= 64  /* Got single point */
};

/* 
   Gcalc_scan_iterator incapsulates the slicescan algorithm.
   It takes filled Gcalc_heap as a datasource. Then can be
   iterated through the vertexes and intersection points with
   the step() method. After the 'step()' one usually observes
   the current 'slice' to do the necessary calculations, like
   looking for intersections, calculating the area, whatever.
*/

class Gcalc_scan_iterator : public Gcalc_dyn_list
{
public:
  class point : public Gcalc_dyn_list::Item
  {
  public:
    Gcalc_coord1 dx;
    Gcalc_coord1 dy;
    Gcalc_heap::Info *pi;
    Gcalc_heap::Info *next_pi;
    Gcalc_heap::Info *ev_pi;
    const Gcalc_coord1 *l_border;
    const Gcalc_coord1 *r_border;
    point *ev_next;

Gcalc_scan_events event;

inline const point *c_get_next() const
      { return (const point *)next; }
    inline bool is_bottom() const { return !next_pi; }
    gcalc_shape_info get_shape() const { return pi->node.shape.shape; }
    inline point *get_next() { return (point *)next; }
    inline const point *get_next() const { return (const point *)next; }
    /* Compare the dx_dy parameters regarding the horiz_dir */
    /* returns -1 if less, 0 if equal, 1 if bigger          */
    static int cmp_dx_dy(const Gcalc_coord1 dx_a,
                         const Gcalc_coord1 dy_a,
                         const Gcalc_coord1 dx_b,
                         const Gcalc_coord1 dy_b);
    static int cmp_dx_dy(const Gcalc_heap::Info *p1,
                         const Gcalc_heap::Info *p2,
                         const Gcalc_heap::Info *p3,
                         const Gcalc_heap::Info *p4);
    int cmp_dx_dy(const point *p) const;
    point **next_ptr() { return (point **) &next; }
#ifndef GCALC_DBUG_OFF
    unsigned int thread;
#endif /*GCALC_DBUG_OFF*/
#ifdef GCALC_CHECK_WITH_FLOAT
    void calc_x(long double *x, long double y, long double ix) const;
#endif /*GCALC_CHECK_WITH_FLOAT*/
  };

/* That class introduced mostly for the 'typecontrol' reason.      */
  /* only difference from the point classis the get_next() function. */
  class event_point : public point
  {
  public:
    inline const event_point *get_next() const
    { return (const event_point*) ev_next; }
    int simple_event() const
    {
      return !ev_next ? (event & (scev_point | scev_end)) : 
        (!ev_next->ev_next && event == scev_two_ends);
    }
  };

class intersection_info : public Gcalc_dyn_list::Item
  {
  public:
    point *edge_a;
    point *edge_b;

Gcalc_coord2 t_a;
    Gcalc_coord2 t_b;
    int t_calculated;
    Gcalc_coord3 x_exp;
    int x_calculated;
    Gcalc_coord3 y_exp;
    int y_calculated;
    void calc_t()
    {if (!t_calculated) do_calc_t(); }
    void calc_y_exp()
    { if (!y_calculated) do_calc_y(); }
    void calc_x_exp()
    { if (!x_calculated) do_calc_x(); }

void do_calc_t();
    void do_calc_x();
    void do_calc_y();
  };

class slice_state
  {
  public:
    point *slice;
    point **event_position_hook;
    point *event_end;
    const Gcalc_heap::Info *pi;
  };

public:
  Gcalc_scan_iterator(size_t blk_size= 8192);

GCALC_DECL_TERMINATED_STATE(killed)

void init(Gcalc_heap *points); /* Iterator can be reused */
  void reset();
  int step();

Gcalc_heap::Info *more_points() { return m_cur_pi; }
  bool more_trapezoids()
    { return m_cur_pi && m_cur_pi->next; }

const point *get_bottom_points() const
    { return m_bottom_points; }
  const point *get_event_position() const
    { return *state.event_position_hook; }
  const point *get_event_end() const
    { return state.event_end; }
  const event_point *get_events() const
    { return (const event_point *)
        (*state.event_position_hook == state.event_end ?
            m_bottom_points : *state.event_position_hook); }
  const point *get_b_slice() const { return state.slice; }
  double get_h() const;
  double get_y() const;
  double get_event_x() const;
  double get_sp_x(const point *sp) const;
  int intersection_step() const
    { return state.pi->type == Gcalc_heap::nt_intersection; }
  const Gcalc_heap::Info *get_cur_pi() const
  {
    return state.pi;
  }

private:
  Gcalc_heap *m_heap;
  Gcalc_heap::Info *m_cur_pi;
  slice_state state;

#ifndef GCALC_DBUG_OFF
  unsigned int m_cur_thread;
#endif /*GCALC_DBUG_OFF*/

point *m_bottom_points;
  point **m_bottom_hook;

int node_scan();
  void eq_scan();
  void intersection_scan();
  void remove_bottom_node();
  int insert_top_node();
  int add_intersection(point *sp_a, point *sp_b,
                       Gcalc_heap::Info *pi_from);
  int add_eq_node(Gcalc_heap::Info *node, point *sp);
  int add_events_for_node(point *sp_node);

point *new_slice_point()
  {
    point *new_point= (point *)new_item();
    return new_point;
  }
  intersection_info *new_intersection_info(point *a, point *b)
  {
    intersection_info *ii= (intersection_info *)new_item();
    ii->edge_a= a;
    ii->edge_b= b;
    ii->t_calculated= ii->x_calculated= ii->y_calculated= 0;
    return ii;
  }
  int arrange_event(int do_sorting, int n_intersections);
  static double get_pure_double(const Gcalc_internal_coord *d, int d_len);
};

/* 
   Gcalc_trapezoid_iterator simplifies the calculations on
   the current slice of the Gcalc_scan_iterator.
   One can walk through the trapezoids formed between
   previous and current slices.
*/

#ifdef TMP_BLOCK
class Gcalc_trapezoid_iterator
{
protected:
  const Gcalc_scan_iterator::point *sp0;
  const Gcalc_scan_iterator::point *sp1;
public:
  Gcalc_trapezoid_iterator(const Gcalc_scan_iterator *scan_i) :
    sp0(scan_i->get_b_slice()),
    sp1(scan_i->get_t_slice())
    {}

inline bool more() const { return sp1 && sp1->next; }

const Gcalc_scan_iterator::point *lt() const { return sp1; }
  const Gcalc_scan_iterator::point *lb() const { return sp0; }
  const Gcalc_scan_iterator::point *rb() const
  {
    const Gcalc_scan_iterator::point *result= sp0;
    while ((result= result->c_get_next())->is_bottom())
    {}
    return result;
  }
  const Gcalc_scan_iterator::point *rt() const
    { return sp1->c_get_next(); }

void operator++()
  {
    sp0= rb();
    sp1= rt();
  }
};
#endif /*TMP_BLOCK*/

/* 
   Gcalc_point_iterator simplifies the calculations on
   the current slice of the Gcalc_scan_iterator.
   One can walk through the points on the current slice.
*/

class Gcalc_point_iterator
{
protected:
  const Gcalc_scan_iterator::point *sp;
public:
  Gcalc_point_iterator(const Gcalc_scan_iterator *scan_i):
    sp(scan_i->get_b_slice())
    {}

inline bool more() const { return sp != NULL; }
  inline void operator++() { sp= sp->c_get_next(); }
  inline const Gcalc_scan_iterator::point *point() const { return sp; }
  inline const Gcalc_heap::Info *get_pi() const { return sp->pi; }
  inline gcalc_shape_info get_shape() const { return sp->get_shape(); }
  inline void restart(const Gcalc_scan_iterator *scan_i)
  { sp= scan_i->get_b_slice(); }
};

#endif /*GCALC_SLICESCAN_INCLUDED*/

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