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/***********************************************************************
* pc_stats.c
*
* Pointclound patch statistics generation.
*
* Copyright (c) 2013 OpenGeo
*
***********************************************************************/
#include "pc_api_internal.h"
#include <float.h>
/*
* Instantiate a new PCDOUBLESTATS for calculation, and set up
* initial values for min/max/sum
*/
static PCDOUBLESTATS *pc_dstats_new(int ndims)
{
int i;
PCDOUBLESTATS *stats = pcalloc(sizeof(PCDOUBLESTATS));
stats->dims = pcalloc(sizeof(PCDOUBLESTAT) * ndims);
for (i = 0; i < ndims; i++)
{
stats->dims[i].min = DBL_MAX;
stats->dims[i].max = -1 * DBL_MAX;
stats->dims[i].sum = 0;
}
stats->npoints = 0;
return stats;
}
static void pc_dstats_free(PCDOUBLESTATS *stats)
{
if (!stats)
return;
if (stats->dims)
pcfree(stats->dims);
pcfree(stats);
return;
}
/**
* Free the standard stats object for in memory patches
*/
void pc_stats_free(PCSTATS *stats)
{
if (stats->min.readonly != PC_TRUE)
pcfree(stats->min.data);
if (stats->max.readonly != PC_TRUE)
pcfree(stats->max.data);
if (stats->avg.readonly != PC_TRUE)
pcfree(stats->avg.data);
pcfree(stats);
return;
}
/**
* Build a standard stats object on top of a serialization, allocate just the
* point shells and set the pointers to look into the data area of the
* serialization.
*/
PCSTATS *pc_stats_new_from_data(const PCSCHEMA *schema, const uint8_t *mindata,
const uint8_t *maxdata, const uint8_t *avgdata)
{
/*size_t sz = schema->size;*/
PCSTATS *stats = pcalloc(sizeof(PCSTATS));
/* All share the schema with the patch */
stats->min.schema = schema;
stats->max.schema = schema;
stats->avg.schema = schema;
/* Data points into serialization */
stats->min.data = (uint8_t *)mindata;
stats->max.data = (uint8_t *)maxdata;
stats->avg.data = (uint8_t *)avgdata;
/* Can't modify external data */
stats->min.readonly = PC_TRUE;
stats->max.readonly = PC_TRUE;
stats->avg.readonly = PC_TRUE;
/* Done */
return stats;
}
/**
* Build a standard stats object with read/write memory, allocate the
* point shells and the data areas underneath. Used for initial calcution
* of patch stats, when objects first created.
*/
PCSTATS *pc_stats_new(const PCSCHEMA *schema)
{
/*size_t sz = schema->size;*/
PCSTATS *stats = pcalloc(sizeof(PCSTATS));
stats->min.schema = schema;
stats->max.schema = schema;
stats->avg.schema = schema;
stats->min.readonly = PC_FALSE;
stats->max.readonly = PC_FALSE;
stats->avg.readonly = PC_FALSE;
stats->min.data = pcalloc(schema->size);
stats->max.data = pcalloc(schema->size);
stats->avg.data = pcalloc(schema->size);
return stats;
}
/**
* Allocate and populate a new PCSTATS from the raw data in
* a PCDOUBLESTATS
*/
static PCSTATS *pc_stats_new_from_dstats(const PCSCHEMA *schema,
const PCDOUBLESTATS *dstats)
{
int i;
PCSTATS *stats = pc_stats_new(schema);
for (i = 0; i < schema->ndims; i++)
{
pc_point_set_double(&(stats->min), schema->dims[i], dstats->dims[i].min);
pc_point_set_double(&(stats->max), schema->dims[i], dstats->dims[i].max);
pc_point_set_double(&(stats->avg), schema->dims[i],
dstats->dims[i].sum / dstats->npoints);
}
return stats;
}
PCSTATS *pc_stats_clone(const PCSTATS *stats)
{
PCSTATS *s;
if (!stats)
return NULL;
s = pcalloc(sizeof(PCSTATS));
s->min.readonly = s->max.readonly = s->avg.readonly = PC_FALSE;
s->min.schema = stats->min.schema;
s->max.schema = stats->max.schema;
s->avg.schema = stats->avg.schema;
s->min.data = pcalloc(stats->min.schema->size);
s->max.data = pcalloc(stats->max.schema->size);
s->avg.data = pcalloc(stats->avg.schema->size);
memcpy(s->min.data, stats->min.data, stats->min.schema->size);
memcpy(s->max.data, stats->max.data, stats->max.schema->size);
memcpy(s->avg.data, stats->avg.data, stats->avg.schema->size);
return s;
}
int pc_patch_uncompressed_compute_stats(PCPATCH_UNCOMPRESSED *pa)
{
int i, j;
const PCSCHEMA *schema = pa->schema;
double val;
PCDOUBLESTATS *dstats = pc_dstats_new(pa->schema->ndims);
if (pa->stats)
pc_stats_free(pa->stats);
/* Point on stack for fast access to values in patch */
PCPOINT pt;
pt.readonly = PC_TRUE;
pt.schema = schema;
pt.data = pa->data;
/* We know npoints right away */
dstats->npoints = pa->npoints;
for (i = 0; i < pa->npoints; i++)
{
for (j = 0; j < schema->ndims; j++)
{
pc_point_get_double(&pt, schema->dims[j], &val);
/* Check minimum */
if (val < dstats->dims[j].min)
dstats->dims[j].min = val;
/* Check maximum */
if (val > dstats->dims[j].max)
dstats->dims[j].max = val;
/* Add to sum */
dstats->dims[j].sum += val;
}
/* Advance to next point */
pt.data += schema->size;
}
pa->stats = pc_stats_new_from_dstats(pa->schema, dstats);
pc_dstats_free(dstats);
return PC_SUCCESS;
}
size_t pc_stats_size(const PCSCHEMA *schema) { return 3 * schema->size; }
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