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gcalc_tools.cc
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gcalc_tools.cc
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/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "my_global.h"
#ifdef HAVE_SPATIAL
#include "sql_string.h"
#include "gcalc_tools.h"
#include "gstream.h" // Gis_read_stream
#include "spatial.h"
#include "sql_class.h" // THD
#define float_to_coord(d) ((double) d)
/*
Adds new shape to the relation.
After that it can be used as an argument of an operation.
*/
gcalc_shape_info Gcalc_function::add_new_shape(uint32 shape_id,
shape_type shape_kind)
{
shapes_buffer.q_append((uint32) shape_kind);
return n_shapes++;
}
/*
Adds new operation to the constructed relation.
To construct the complex relation one has to specify operations
in prefix style.
*/
void Gcalc_function::add_operation(op_type operation, uint32 n_operands)
{
uint32 op_code= (uint32 ) operation + n_operands;
function_buffer.q_append(op_code);
}
/*
Sometimes the number of arguments is unknown at the moment the operation
is added. That allows to specify it later.
*/
void Gcalc_function::add_operands_to_op(uint32 operation_pos, uint32 n_operands)
{
uint32 op_code= uint4korr(function_buffer.ptr() + operation_pos) + n_operands;
function_buffer.write_at_position(operation_pos, op_code);
}
void Gcalc_function::set_operands_to_op(uint32 operation_pos, uint32 n_operands)
{
uint32 op_code= (uint4korr(function_buffer.ptr() + operation_pos) & op_any) +
n_operands;
function_buffer.write_at_position(operation_pos, op_code);
}
/*
Just like the add_operation() but the result will be the inverted
value of an operation.
*/
void Gcalc_function::add_not_operation(op_type operation, uint32 n_operands)
{
uint32 op_code= ((uint32) op_not | (uint32 ) operation) + n_operands;
function_buffer.q_append(op_code);
}
int Gcalc_function::single_shape_op(shape_type shape_kind, gcalc_shape_info *si)
{
if (reserve_shape_buffer(1) || reserve_op_buffer(1))
return 1;
*si= add_new_shape(0, shape_kind);
add_operation(op_shape, *si);
return 0;
}
/*
Specify how many arguments we're going to have.
*/
int Gcalc_function::reserve_shape_buffer(uint n_shapes)
{
return shapes_buffer.reserve(n_shapes * shape_buffer_item_size, 512);
}
/*
Specify how many operations we're going to have.
*/
int Gcalc_function::reserve_op_buffer(uint n_ops)
{
return function_buffer.reserve(n_ops * function_buffer_item_size, 512);
}
int Gcalc_function::alloc_states()
{
if (function_buffer.reserve((n_shapes+1) * sizeof(int)))
return 1;
i_states= (int *) (function_buffer.ptr() + ALIGN_SIZE(function_buffer.length()));
return 0;
}
#ifndef DBUG_OFF
/**
Return spatial operation name from its numeric code.
*/
const char *Gcalc_function::op_name(int code)
{
enum op_type type= (enum op_type) code;
switch (type)
{
case op_shape: return "op_shape";
case op_not: return "op_not";
case op_union: return "op_union";
case op_intersection: return "op_intersection";
case op_symdifference: return "op_symdifference";
case op_difference: return "op_difference";
case op_backdifference: return "op_backdifference";
case op_any: return "op_any";
}
return "op_unknown";
}
const char *Gcalc_function::shape_name(int code)
{
switch (code)
{
case shape_point: return "shape_point";
case shape_line: return "shape_line";
case shape_polygon: return "shape_polygon";
case shape_hole: return "shape_hole";
}
return "shape_unknown";
}
/**
Trace spatial operation buffer into debug log
and optionally into client side warnings.
*/
void Gcalc_function::debug_print_function_buffer()
{
int i, nelements= function_buffer.length() / function_buffer_item_size;
THD *thd= current_thd;
DBUG_PRINT("info", ("nelements=%d", nelements));
for (i= 0; i < nelements; i++)
{
int c_op= uint4korr(function_buffer.ptr() + function_buffer_item_size * i);
int func= (c_op & op_any);
int mask= (c_op & op_not) ? 1 : 0;
int n_ops= c_op & ~op_any;
const char *c_op_name= op_name(func);
const char *s_name= (func == op_shape) ?
shape_name(uint4korr(shapes_buffer.ptr() +
shape_buffer_item_size * n_ops)) : "";
DBUG_PRINT("info", ("[%d]=%d c_op=%d (%s) mask=%d n_ops=%d",
i, c_op, func, c_op_name, mask, n_ops));
if (thd->get_gis_debug())
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_UNKNOWN_ERROR, "[%d] %s[%d]%s",
i, c_op_name, n_ops, s_name);
}
}
#endif
int Gcalc_function::count_internal()
{
int c_op= uint4korr(cur_func);
op_type next_func= (op_type) (c_op & op_any);
int mask= (c_op & op_not) ? 1:0;
int n_ops= c_op & ~op_any;
int result;
cur_func+= function_buffer_item_size;
if (next_func == op_shape)
return i_states[c_op & ~(op_any | op_not)] ^ mask;
result= count_internal();
while (--n_ops)
{
int next_res= count_internal();
switch (next_func)
{
case op_union:
result= result | next_res;
break;
case op_intersection:
result= result & next_res;
break;
case op_symdifference:
result= result ^ next_res;
break;
case op_difference:
result= result & !next_res;
break;
case op_backdifference:
result= (!result) & next_res;
break;
default:
DBUG_ASSERT(FALSE);
};
}
return result ^ mask;
}
/*
Clear the state of the object.
*/
void Gcalc_function::reset()
{
n_shapes= 0;
shapes_buffer.length(0);
function_buffer.length(0);
}
int Gcalc_function::find_function(Gcalc_scan_iterator &scan_it)
{
while (scan_it.more_points())
{
if (scan_it.step())
return -1;
Gcalc_scan_events ev= scan_it.get_event();
const Gcalc_scan_iterator::point *evpos= scan_it.get_event_position();
if (ev & (scev_point | scev_end | scev_two_ends))
continue;
clear_state();
for (Gcalc_point_iterator pit(&scan_it); pit.point() != evpos; ++pit)
{
gcalc_shape_info si= pit.point()->get_shape();
if ((get_shape_kind(si) == Gcalc_function::shape_polygon))
invert_state(si);
}
invert_state(evpos->get_shape());
if (ev == scev_intersection)
{
const Gcalc_scan_iterator::point *evnext= evpos->c_get_next();
if ((get_shape_kind(evpos->get_shape()) !=
Gcalc_function::shape_polygon) ||
(get_shape_kind(evnext->get_shape()) !=
Gcalc_function::shape_polygon))
invert_state(evnext->get_shape());
}
if (count())
return 1;
}
return 0;
}
int Gcalc_operation_transporter::single_point(Gcalc_shape_status *st,
double x, double y)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::single_point: %g %g", x, y));
gcalc_shape_info si;
return m_fn->single_shape_op(Gcalc_function::shape_point, &si) ||
int_single_point(si, x, y);
}
int Gcalc_operation_transporter::start_line(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::start_line"));
int_start_line();
return m_fn->single_shape_op(Gcalc_function::shape_line, &m_si);
}
int Gcalc_operation_transporter::complete_line(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::complete_line"));
int_complete_line();
return 0;
}
int Gcalc_operation_transporter::start_poly(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::start_poly"));
int_start_poly();
return m_fn->single_shape_op(Gcalc_function::shape_polygon, &m_si);
}
int Gcalc_operation_transporter::complete_poly(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::complete_poly"));
int_complete_poly();
return 0;
}
int Gcalc_operation_transporter::start_ring(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::start_ring"));
int_start_ring();
return 0;
}
int Gcalc_operation_transporter::complete_ring(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::complete_ring"));
int_complete_ring();
return 0;
}
int Gcalc_operation_transporter::add_point(Gcalc_shape_status *st,
double x, double y)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::add_point %g %g", x, y));
return int_add_point(m_si, x, y);
}
int Gcalc_operation_transporter::start_collection(Gcalc_shape_status *st,
int n_objects)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::start_collection"));
if (m_fn->reserve_shape_buffer(n_objects) || m_fn->reserve_op_buffer(1))
return 1;
m_fn->add_operation(Gcalc_function::op_union, n_objects);
return 0;
}
int Gcalc_operation_transporter::complete_collection(Gcalc_shape_status *st)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::complete_collection"));
return 0;
}
int Gcalc_operation_transporter::collection_add_item(Gcalc_shape_status
*st_collection,
Gcalc_shape_status
*st_item)
{
DBUG_PRINT("info", ("Gcalc_operation_transporter::collection_add_item"));
return 0;
}
int Gcalc_result_receiver::start_shape(Gcalc_function::shape_type shape)
{
DBUG_ENTER("Gcalc_result_receiver::start_shape");
DBUG_PRINT("info", ("%s", Gcalc_function::shape_name(shape)));
if (buffer.reserve(4*2, 512))
DBUG_RETURN(1);
cur_shape= shape;
shape_pos= buffer.length();
buffer.length(shape_pos + ((shape == Gcalc_function::shape_point) ? 4:8));
n_points= 0;
shape_area= 0.0;
DBUG_RETURN(0);
}
int Gcalc_result_receiver::add_point(double x, double y)
{
DBUG_ENTER("Gcalc_result_receiver::add_point");
DBUG_PRINT("info", ("xy=(%g,%g)", x, y));
if (n_points && x == prev_x && y == prev_y)
DBUG_RETURN(0);
if (!n_points++)
{
prev_x= first_x= x;
prev_y= first_y= y;
DBUG_RETURN(0);
}
shape_area+= prev_x*y - prev_y*x;
if (buffer.reserve(8*2, 512))
DBUG_RETURN(1);
buffer.q_append(prev_x);
buffer.q_append(prev_y);
prev_x= x;
prev_y= y;
DBUG_RETURN(0);
}
int Gcalc_result_receiver::complete_shape()
{
DBUG_ENTER("Gcalc_result_receiver::complete_shape");
DBUG_PRINT("info", ("n_points=%u", (uint) n_points));
if (n_points == 0)
{
buffer.length(shape_pos);
DBUG_RETURN(0);
}
if (n_points == 1)
{
if (cur_shape == Gcalc_function::shape_hole ||
cur_shape == Gcalc_function::shape_polygon)
{
/*
All points of a hole (or a polygon) have the same
coordinates - remove the shape.
*/
buffer.length(shape_pos);
DBUG_RETURN(0);
}
if (cur_shape != Gcalc_function::shape_point)
{
cur_shape= Gcalc_function::shape_point;
buffer.length(buffer.length()-4);
}
}
else
{
DBUG_ASSERT(cur_shape != Gcalc_function::shape_point);
if (cur_shape == Gcalc_function::shape_hole ||
cur_shape == Gcalc_function::shape_polygon)
{
shape_area+= prev_x*first_y - prev_y*first_x;
/* Remove a hole (or a polygon) if its area == 0. */
if (fabs(shape_area) < 1e-8)
{
buffer.length(shape_pos);
DBUG_RETURN(0);
}
if (prev_x == first_x && prev_y == first_y)
{
n_points--;
buffer.write_at_position(shape_pos + 4, n_points);
goto do_complete;
}
}
buffer.write_at_position(shape_pos+4, n_points);
}
if (buffer.reserve(8*2, 512))
DBUG_RETURN(1);
buffer.q_append(prev_x);
buffer.q_append(prev_y);
do_complete:
buffer.write_at_position(shape_pos, (uint32) cur_shape);
if (!n_shapes++)
{
DBUG_ASSERT(cur_shape != Gcalc_function::shape_hole);
common_shapetype= cur_shape;
}
else if (cur_shape == Gcalc_function::shape_hole)
{
++n_holes;
}
else if (!collection_result && (cur_shape != common_shapetype))
{
collection_result= true;
}
DBUG_PRINT("info",
("n_shapes=%u cur_shape=%s common_shapetype=%s",
(uint) n_shapes, Gcalc_function::shape_name(cur_shape),
Gcalc_function::shape_name(common_shapetype)));
DBUG_RETURN(0);
}
int Gcalc_result_receiver::single_point(double x, double y)
{
DBUG_PRINT("info", ("single_point xy=(%g,%g)", x, y));
return start_shape(Gcalc_function::shape_point) ||
add_point(x, y) ||
complete_shape();
}
int Gcalc_result_receiver::done()
{
DBUG_ENTER("Gcalc_result_receiver::done");
DBUG_RETURN(0);
}
void Gcalc_result_receiver::reset()
{
DBUG_ENTER("Gcalc_result_receiver::reset");
buffer.length(0);
collection_result= FALSE;
n_shapes= n_holes= 0;
DBUG_VOID_RETURN;
}
int Gcalc_result_receiver::get_result_typeid()
{
DBUG_ENTER("Gcalc_result_receiver::get_result_typeid");
if (!n_shapes)
DBUG_RETURN(0);
if (collection_result)
DBUG_RETURN(Geometry::wkb_geometrycollection);
switch (common_shapetype)
{
case Gcalc_function::shape_polygon:
DBUG_RETURN((n_shapes - n_holes == 1) ? Geometry::wkb_polygon :
Geometry::wkb_multipolygon);
case Gcalc_function::shape_point:
DBUG_RETURN((n_shapes == 1) ? Geometry::wkb_point :
Geometry::wkb_multipoint);
case Gcalc_function::shape_line:
DBUG_RETURN((n_shapes == 1) ? Geometry::wkb_linestring :
Geometry::wkb_multilinestring);
default:
DBUG_ASSERT(0);
}
DBUG_RETURN(0);
}
Gcalc_operation_reducer::Gcalc_operation_reducer(size_t blk_size) :
Gcalc_dyn_list(blk_size, sizeof(res_point)),
m_res_hook((Gcalc_dyn_list::Item **)&m_result),
m_first_active_thread(NULL)
{
// We use sizeof(res_point) in constructor, the other items must be smaller
DBUG_ASSERT(sizeof(res_point) >= sizeof(active_thread));
}
void Gcalc_operation_reducer::init(Gcalc_function *fn, modes mode)
{
DBUG_ENTER("Gcalc_result_receiver::init");
m_fn= fn;
m_mode= mode;
m_first_active_thread= NULL;
DBUG_VOID_RETURN;
}
Gcalc_operation_reducer::
Gcalc_operation_reducer(Gcalc_function *fn, modes mode, size_t blk_size) :
Gcalc_dyn_list(blk_size, sizeof(res_point)),
m_res_hook((Gcalc_dyn_list::Item **)&m_result)
{
DBUG_ENTER("Gcalc_operation_reducer::Gcalc_operation_reducer");
init(fn, mode);
DBUG_VOID_RETURN;
}
inline int Gcalc_operation_reducer::continue_range(active_thread *t,
const Gcalc_heap::Info *p)
{
DBUG_ENTER("Gcalc_operation_reducer::continue_range");
DBUG_ASSERT(t->result_range);
res_point *rp= add_res_point(p);
if (!rp)
DBUG_RETURN(1);
rp->glue= NULL;
rp->down= t->rp;
t->rp->up= rp;
t->rp= rp;
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::continue_i_range(active_thread *t,
const Gcalc_heap::Info *p,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::continue_i_range");
DBUG_ASSERT(t->result_range);
res_point *rp= add_res_i_point(p, x, y);
if (!rp)
DBUG_RETURN(1);
rp->glue= NULL;
rp->down= t->rp;
t->rp->up= rp;
t->rp= rp;
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::start_range(active_thread *t,
const Gcalc_heap::Info *p)
{
DBUG_ENTER("Gcalc_operation_reducer::start_range");
res_point *rp= add_res_point(p);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->down= NULL;
t->result_range= 1;
t->rp= rp;
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::start_i_range(active_thread *t,
const Gcalc_heap::Info *p,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::start_i_range");
res_point *rp= add_res_i_point(p, x, y);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->down= NULL;
t->result_range= 1;
t->rp= rp;
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::end_range(active_thread *t,
const Gcalc_heap::Info *p)
{
DBUG_ENTER("Gcalc_operation_reducer::end_range");
res_point *rp= add_res_point(p);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->up= NULL;
rp->down= t->rp;
t->rp->up= rp;
t->result_range= 0;
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::end_i_range(active_thread *t,
const Gcalc_heap::Info *p,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::end_i_range");
res_point *rp= add_res_i_point(p, x, y);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->up= NULL;
rp->down= t->rp;
t->rp->up= rp;
t->result_range= 0;
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::start_couple(active_thread *t0, active_thread *t1,
const Gcalc_heap::Info *p,
const active_thread *prev_range)
{
DBUG_ENTER("Gcalc_operation_reducer::start_couple");
res_point *rp0, *rp1;
if (!(rp0= add_res_point(p)) || !(rp1= add_res_point(p)))
DBUG_RETURN(1);
rp0->glue= rp1;
rp1->glue= rp0;
rp0->down= rp1->down= NULL;
t0->rp= rp0;
t1->rp= rp1;
if (prev_range)
{
rp0->set_outer_poly(prev_range->thread_start());
t1->set_thread_start(prev_range->thread_start());
}
else
{
rp0->set_outer_poly(NULL);
t0->set_thread_start(rp0);
}
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::start_i_couple(active_thread *t0, active_thread *t1,
const Gcalc_heap::Info *p0,
const Gcalc_heap::Info *p1,
double x, double y,
const active_thread *prev_range)
{
DBUG_ENTER("Gcalc_operation_reducer::start_i_couple");
res_point *rp0, *rp1;
if (!(rp0= add_res_i_point(p0, x, y)) || !(rp1= add_res_i_point(p1, x, y)))
DBUG_RETURN(1);
rp0->glue= rp1;
rp1->glue= rp0;
rp0->down= rp1->down= NULL;
t0->result_range= t1->result_range= 1;
t0->rp= rp0;
t1->rp= rp1;
if (prev_range)
{
rp0->set_outer_poly(prev_range->thread_start());
t1->set_thread_start(prev_range->thread_start());
}
else
{
rp0->set_outer_poly(NULL);
t0->set_thread_start(rp0);
}
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::end_couple(active_thread *t0, active_thread *t1,
const Gcalc_heap::Info *p)
{
DBUG_ENTER("Gcalc_operation_reducer::end_couple");
res_point *rp0, *rp1;
DBUG_ASSERT(t1->result_range);
if (!(rp0= add_res_point(p)) || !(rp1= add_res_point(p)))
DBUG_RETURN(1);
rp0->down= t0->rp;
rp1->down= t1->rp;
rp1->glue= rp0;
rp0->glue= rp1;
rp0->up= rp1->up= NULL;
t0->rp->up= rp0;
t1->rp->up= rp1;
t0->result_range= t1->result_range= 0;
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::end_i_couple(active_thread *t0, active_thread *t1,
const Gcalc_heap::Info *p0,
const Gcalc_heap::Info *p1,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::end_i_couple");
res_point *rp0, *rp1;
if (!(rp0= add_res_i_point(p0, x, y)) || !(rp1= add_res_i_point(p1, x, y)))
DBUG_RETURN(1);
rp0->down= t0->rp;
rp1->down= t1->rp;
rp1->glue= rp0;
rp0->glue= rp1;
rp0->up= rp1->up= NULL;
t0->result_range= t1->result_range= 0;
t0->rp->up= rp0;
t1->rp->up= rp1;
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::add_single_point(const Gcalc_heap::Info *p)
{
DBUG_ENTER("Gcalc_operation_reducer::add_single_point");
res_point *rp= add_res_single_point(p);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->up= rp->down= NULL;
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::add_i_single_point(const Gcalc_heap::Info *p,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::add_i_single_point");
res_point *rp= add_res_i_point(p, x, y);
if (!rp)
DBUG_RETURN(1);
rp->glue= rp->up= rp->down= NULL;
DBUG_RETURN(0);
}
int Gcalc_operation_reducer::
handle_lines_intersection(active_thread *t0, active_thread *t1,
const Gcalc_heap::Info *p0, const Gcalc_heap::Info *p1,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::handle_lines_intersection");
DBUG_PRINT("info", ("p=(%g,%g,#%u) p1=(%g,%g,#%u) xy=(%g,%g)",
p0->x, p0->y, p0->shape, p1->x, p1->y, p1->shape, x, y));
m_fn->invert_state(p0->shape);
m_fn->invert_state(p1->shape);
int intersection_state= m_fn->count();
if ((t0->result_range | t1->result_range) == intersection_state)
DBUG_RETURN(0);
if (t0->result_range &&
(end_i_range(t0, p1, x, y) || start_i_range(t0, p1, x, y)))
DBUG_RETURN(1);
if (t1->result_range &&
(end_i_range(t1, p0, x, y) || start_i_range(t1, p0, x, y)))
DBUG_RETURN(1);
if (intersection_state &&
add_i_single_point(p0, x, y))
DBUG_RETURN(1);
DBUG_RETURN(0);
}
inline int Gcalc_operation_reducer::
handle_line_polygon_intersection(active_thread *l, const Gcalc_heap::Info *pl,
int line_state, int poly_state,
double x, double y)
{
DBUG_ENTER("Gcalc_operation_reducer::handle_line_polygon_intersection");
DBUG_PRINT("info", ("p=(%g,%g,#%u) xy=(%g,%g)",
pl->x, pl->y, pl->shape, x, y));
int range_after= ~poly_state & line_state;
if (l->result_range == range_after)
DBUG_RETURN(0);
DBUG_RETURN(range_after ? start_i_range(l, pl, x, y) :
end_i_range(l, pl, x, y));
}
static inline void switch_athreads(Gcalc_operation_reducer::active_thread *t0,
Gcalc_operation_reducer::active_thread *t1,
Gcalc_dyn_list::Item **hook)
{
*hook= t1;
t0->next= t1->next;
t1->next= t0;
}
inline int Gcalc_operation_reducer::
handle_polygons_intersection(active_thread *t0, active_thread *t1,
Gcalc_dyn_list::Item **t_hook,
const Gcalc_heap::Info *p0,
const Gcalc_heap::Info *p1,
int prev_state, double x, double y,
const active_thread *prev_range)
{
DBUG_ENTER("Gcalc_operation_reducer::handle_polygons_intersection");
DBUG_PRINT("info", ("p0=(%g,%g,#%u) p1=(%g,%g,#%u) xy=(%g,%g)",
p0->x, p0->y, p0->shape, p1->x, p1->y, p1->shape, x, y));
m_fn->invert_state(p0->shape);
int state_11= m_fn->count();
m_fn->invert_state(p1->shape);
int state_2= m_fn->count();
int state_01= prev_state ^ t0->result_range;
if ((prev_state == state_01) && (prev_state == state_2))
{
if (state_11 == prev_state)
{
switch_athreads(t0, t1, t_hook);
DBUG_RETURN(0);
}
DBUG_RETURN(start_i_couple(t0, t1, p0, p1, x, y, prev_range));
}
if (prev_state == state_2)
{
if (state_01 == state_11)
{
if (m_mode & polygon_selfintersections_allowed)
{
switch_athreads(t0, t1, t_hook);
DBUG_RETURN(0);
}
if (prev_state != (m_mode & prefer_big_with_holes))
DBUG_RETURN(continue_i_range(t0, p0, x, y) ||
continue_i_range(t1, p1, x, y));
DBUG_RETURN(end_i_couple(t0, t1, p0, p1, x, y) ||
start_i_couple(t0, t1, p0, p1, x, y, prev_range));
}
else
DBUG_RETURN(end_i_couple(t0, t1, p0, p1, x, y));
}
if (state_01 ^ state_11)
{
switch_athreads(t0, t1, t_hook);
DBUG_RETURN(0);
}
active_thread *thread_to_continue;
const Gcalc_heap::Info *way_to_go;
if (prev_state == state_01)
{
thread_to_continue= t1;
way_to_go= p1;
}
else
{
thread_to_continue= t0;
way_to_go= p0;
}
DBUG_RETURN(continue_i_range(thread_to_continue, way_to_go, x, y));
}
int Gcalc_operation_reducer::count_slice(Gcalc_scan_iterator *si)
{
DBUG_ENTER("Gcalc_operation_reducer::count_slice");
Gcalc_point_iterator pi(si);
active_thread *cur_t= m_first_active_thread;
Gcalc_dyn_list::Item **at_hook= (Gcalc_dyn_list::Item **)&m_first_active_thread;
const active_thread *prev_range;
int prev_state;
if (si->get_event() & (scev_point | scev_end | scev_two_ends))
{
for (; pi.point() != si->get_event_position(); ++pi, cur_t= cur_t->get_next())
at_hook= &cur_t->next;
switch (si->get_event())
{
case scev_point:
{
DBUG_PRINT("Gcalc_operation_reducer", ("event=scev_point"));
if (cur_t->result_range &&
continue_range(cur_t, pi.get_pi()))
DBUG_RETURN(1);
break;
}
case scev_end:
{
DBUG_PRINT("Gcalc_operation_reducer", ("event=scev_end"));
if (cur_t->result_range &&
end_range(cur_t, pi.get_pi()))
DBUG_RETURN(1);
*at_hook= cur_t->next;
free_item(cur_t);
break;
}
case scev_two_ends:
{
DBUG_PRINT("Gcalc_operation_reducer", ("event=scev_two_ends"));
active_thread *cur_t1= cur_t->get_next();
if (cur_t->result_range &&
end_couple(cur_t, cur_t1, pi.get_pi()))
DBUG_RETURN(1);
*at_hook= cur_t1->next;
free_list(cur_t, &cur_t1->next);
break;
}
default:
DBUG_ASSERT(0);
}
DBUG_RETURN(0);
}
prev_state= 0;
prev_range= 0;
m_fn->clear_state();
for (; pi.point() != si->get_event_position(); ++pi, cur_t= cur_t->get_next())
{
if (m_fn->get_shape_kind(pi.get_shape()) == Gcalc_function::shape_polygon)
{
m_fn->invert_state(pi.get_shape());
prev_state^= cur_t->result_range;
}
at_hook= &cur_t->next;
if (cur_t->result_range)
prev_range= prev_state ? cur_t : 0;
}
switch (si->get_event())
{
case scev_thread:
{
DBUG_PRINT("info", ("event=scev_thread"));
active_thread *new_t= new_active_thread();
if (!new_t)
DBUG_RETURN(1);
m_fn->invert_state(pi.get_shape());
new_t->result_range= prev_state ^ m_fn->count();
new_t->next= *at_hook;
*at_hook= new_t;
if (new_t->result_range &&
start_range(new_t, pi.get_pi()))
DBUG_RETURN(1);
break;
}
case scev_two_threads:
{
DBUG_PRINT("info", ("event=scev_two_threads"));
active_thread *new_t0, *new_t1;
int fn_result;
if (!(new_t0= new_active_thread()) || !(new_t1= new_active_thread()))
DBUG_RETURN(1);
m_fn->invert_state(pi.get_shape());
fn_result= m_fn->count();
new_t0->result_range= new_t1->result_range= prev_state ^ fn_result;
new_t1->next= *at_hook;
new_t0->next= new_t1;